Other: Release Bridge Iron v1.7.0

Add patched libqcocoa based on Qt 5.13.0

.gitignore

@@ -26,6 +26,9 @@ internal/frontend/qml/ProtonUI/images
 internal/frontend/qml/ImportExportUI/images
 frontend/qml/*.qmlc
 
+# Credits files (generated).
+internal/**/credits.go
+
 # Build files
 /launcher-*
 /bridge_*_*.tgz

.golangci.yml

@@ -1,3 +1,4 @@
+---
 run:
   timeout: 10m
   build-tags:
@@ -8,9 +9,11 @@ run:
 issues:
   exclude-use-default: false
   exclude:
-     - Using the variable on range scope `tt` in function literal
+    - Using the variable on range scope `tt` in function literal
-     - should have comment (\([^)]+\) )?or be unexported # For now we are missing a lot of comments.
+    # For now we are missing a lot of comments.
-     - at least one file in a package should have a package comment # For now we are missing a lot of comments.
+    - should have comment (\([^)]+\) )?or be unexported
+    # For now we are missing a lot of comments.
+    - at least one file in a package should have a package comment
 
   exclude-rules:
     - path: _test\.go
@@ -30,7 +33,7 @@ linters-settings:
 linters:
   # setting disable-all will make only explicitly enabled linters run
   disable-all: true
-  
+
   enable:
     - deadcode          # Finds unused code [fast: true, auto-fix: false]
     - errcheck          # Errcheck is a program for checking for unchecked errors in go programs. These unchecked errors can be critical bugs in some cases [fast: true, auto-fix: false]
@@ -49,7 +52,6 @@ linters:
     - funlen            # Tool for detection of long functions [fast: true, auto-fix: false]
     - gochecknoglobals  # Checks that no globals are present in Go code [fast: true, auto-fix: false]
     - gochecknoinits    # Checks that no init functions are present in Go code [fast: true, auto-fix: false]
-    #- gocognit          # Computes and checks the cognitive complexity of functions [fast: true, auto-fix: false]
     - goconst           # Finds repeated strings that could be replaced by a constant [fast: true, auto-fix: false]
     - gocritic          # The most opinionated Go source code linter [fast: true, auto-fix: false]
     - gocyclo           # Computes and checks the cyclomatic complexity of functions [fast: true, auto-fix: false]
@@ -58,15 +60,52 @@ linters:
     - goimports         # Goimports does everything that gofmt does. Additionally it checks unused imports [fast: true, auto-fix: true]
     - golint            # Golint differs from gofmt. Gofmt reformats Go source code, whereas golint prints out style mistakes [fast: true, auto-fix: false]
     - gosec             # Inspects source code for security problems [fast: true, auto-fix: false]
-    - interfacer        # Linter that suggests narrower interface types [fast: true, auto-fix: false]
-    - maligned          # Tool to detect Go structs that would take less memory if their fields were sorted [fast: true, auto-fix: false]
     - misspell          # Finds commonly misspelled English words in comments [fast: true, auto-fix: true]
     - nakedret          # Finds naked returns in functions greater than a specified function length [fast: true, auto-fix: false]
     - prealloc          # Finds slice declarations that could potentially be preallocated [fast: true, auto-fix: false]
-    - scopelint         # Scopelint checks for unpinned variables in go programs [fast: true, auto-fix: false]
     - stylecheck        # Stylecheck is a replacement for golint [fast: true, auto-fix: false]
     - unconvert         # Remove unnecessary type conversions [fast: true, auto-fix: false]
     - unparam           # Reports unused function parameters [fast: true, auto-fix: false]
     - whitespace        # Tool for detection of leading and trailing whitespace [fast: true, auto-fix: true]
-    #- wsl               # Whitespace Linter - Forces you to use empty lines! [fast: true, auto-fix: false]
+    - asciicheck        # Simple linter to check that your code does not contain non-ASCII identifiers [fast: true, auto-fix: false]
-    #- lll               # Reports long lines [fast: true, auto-fix: false]
+    - durationcheck     # check for two durations multiplied together [fast: false, auto-fix: false]
+    - exhaustive        # check exhaustiveness of enum switch statements [fast: false, auto-fix: false]
+    - exportloopref     # checks for pointers to enclosing loop variables [fast: false, auto-fix: false]
+    - forcetypeassert   # finds forced type assertions [fast: true, auto-fix: false]
+    - godot             # Check if comments end in a period [fast: true, auto-fix: true]
+    - goheader          # Checks is file header matches to pattern [fast: true, auto-fix: false]
+    - gomodguard        # Allow and block list linter for direct Go module dependencies. This is different from depguard where there are different block types for example version constraints and module recommendations. [fast: true, auto-fix: false]
+    - goprintffuncname  # Checks that printf-like functions are named with `f` at the end [fast: true, auto-fix: false]
+    - importas          # Enforces consistent import aliases [fast: false, auto-fix: false]
+    - makezero          # Finds slice declarations with non-zero initial length [fast: false, auto-fix: false]
+    - nilerr            # Finds the code that returns nil even if it checks that the error is not nil. [fast: false, auto-fix: false]
+    - predeclared       # find code that shadows one of Go's predeclared identifiers [fast: true, auto-fix: false]
+    - revive            # Fast, configurable, extensible, flexible, and beautiful linter for Go. Drop-in replacement of golint. [fast: false, auto-fix: false]
+    - rowserrcheck      # checks whether Err of rows is checked successfully [fast: false, auto-fix: false]
+    - sqlclosecheck     # Checks that sql.Rows and sql.Stmt are closed. [fast: false, auto-fix: false]
+    - tparallel         # tparallel detects inappropriate usage of t.Parallel() method in your Go test codes [fast: false, auto-fix: false]
+    - wastedassign      # wastedassign finds wasted assignment statements. [fast: false, auto-fix: false]
+    # - wsl               # Whitespace Linter - Forces you to use empty lines! [fast: true, auto-fix: false]
+    # - lll               # Reports long lines [fast: true, auto-fix: false]
+    # Consider to include:
+    # - gocognit          # Computes and checks the cognitive complexity of functions [fast: true, auto-fix: false]
+    # - cyclop            # checks function and package cyclomatic complexity [fast: false, auto-fix: false]
+    # - errorlint         # go-errorlint is a source code linter for Go software that can be used to find code that will cause problems with the error wrapping scheme introduced in Go 1.13. [fast: false, auto-fix: false]
+    # - exhaustivestruct  # Checks if all struct's fields are initialized [fast: false, auto-fix: false]
+    # - forbidigo         # Forbids identifiers [fast: true, auto-fix: false]
+    # - gci               # Gci control golang package import order and make it always deterministic. [fast: true, auto-fix: true]
+    # - gocognit          # Computes and checks the cognitive complexity of functions [fast: true, auto-fix: false]
+    # - goerr113          # Golang linter to check the errors handling expressions [fast: false, auto-fix: false]
+    # - gofumpt           # Gofumpt checks whether code was gofumpt-ed. [fast: true, auto-fix: true]
+    # - gomnd             # An analyzer to detect magic numbers. [fast: true, auto-fix: false]
+    # - gomoddirectives   # Manage the use of 'replace', 'retract', and 'excludes' directives in go.mod. [fast: true, auto-fix: false]
+    # - ifshort           # Checks that your code uses short syntax for if-statements whenever possible [fast: true, auto-fix: false]
+    # - nestif            # Reports deeply nested if statements [fast: true, auto-fix: false]
+    # - nlreturn          # nlreturn checks for a new line before return and branch statements to increase code clarity [fast: true, auto-fix: false]
+    # - noctx             # noctx finds sending http request without context.Context [fast: false, auto-fix: false]
+    # - nolintlint        # Reports ill-formed or insufficient nolint directives [fast: true, auto-fix: false]
+    # - paralleltest      # paralleltest detects missing usage of t.Parallel() method in your Go test [fast: true, auto-fix: false]
+    # - testpackage       # linter that makes you use a separate _test package [fast: true, auto-fix: false]
+    # - thelper           # thelper detects golang test helpers without t.Helper() call and checks the consistency of test helpers [fast: false, auto-fix: false]
+    # - wrapcheck         # Checks that errors returned from external packages are wrapped [fast: false, auto-fix: false]
+

Changelog.md

@@ -2,6 +2,139 @@
 
 Changelog [format](http://keepachangelog.com/en/1.0.0/)
 
+## [Bridge 1.7.0] Iron
+
+### Added
+* GODT-213 New message builder:
+    * Preserve Content-Type for undecryptable message body.
+    * Use application/octet-stream for encrypted parts.
+    * Force no transfer encoding for embedded message/rfc822 parts.
+    * Remove dead code GetRelatedHeader/GetRelatedBoundary.
+    * Correctly expect text/plain in custom message text parts.
+    * Force text/plain for custom message text part.
+    * Complex external encrypted tests (multipart/alternative, message/rfc822 attachment).
+
+### Fixed
+* GODT-1136 DB Cache header from builder and test.
+* GODT-1113 Fix tray icon size on macOS Big Sur.
+* GODT-947 Force colors in logs.
+
+
+## [Bridge 1.6.9] HZM
+
+### Fixed
+* GODT-1121 'Keep the application up to date' switches off after restarting Bridge.
+
+
+## [Bridge 1.6.8] HZM
+
+### Fixed
+* GODT-1120 Use Info level in internal/app logs.
+
+
+## [IE 1.3.3] Farg
+
+### Fixed
+* GODT-1120 Use Info level in internal/app logs.
+
+
+## [Bridge 1.6.7] HZM
+
+### Added
+* GODT-1111 Add correct metadata to Windows executables.
+* GODT-1112 Add application to Windows Firewall exclusion list on install.
+* GODT-1077 Track how many times message is built to help understand re-syncs.
+
+### Changed
+* GODT-247 Revise all storage locations (cache, config, local etc).
+
+### Fixed
+* GODT-948 Parser does not handle embedding of Content-Type: message/rfc822.
+* GODT-1079 Correct 9001 error handling on login.
+
+### Security
+* GODT-1105 Dylib Hijacking security fix.
+
+
+## [IE 1.3.2] Farg
+
+### Added
+* GODT-1111 Add correct metadata to Windows executables.
+* GODT-1112 Add application to Windows Firewall exclusion list on install.
+
+### Changed
+* GODT-247 Revise all storage locations (cache, config, local etc).
+
+### Fixed
+* GODT-1079 Correct 9001 error handling on login.
+
+### Security
+* GODT-1105 Dylib Hijacking security fix.
+
+
+## [IE 1.3.1] Farg
+
+### Changed
+* GODT-1047 No silent updates for Import-Export app.
+* GODT-247 Cache and update files moved from user's cache to config.
+
+### Fixed
+* Other: include latest go.mod/go.sum changes.
+* GODT-803 Fix import to wrong target address.
+* GODT-948 Embedded messages.
+* GODT-1043 Fix showing long login error in GUI dialog.
+
+
+## [Bridge 1.6.6] HZM
+
+### Added
+* Other: QA build checks for update every 5 minutes.
+* Other: QA build adds debug message dump when sending.
+
+### Changed
+* GODT-1045 build without Qt by default.
+
+### Fixed
+* GODT-1029 Fix tray icon not updating under certain conditions.
+* GODT-1062 Fix lost notification bar when window is closed.
+* GODT-1058 Install version after chaning channel right away only in case of downgrade.
+* GODT-1073 Re-write autostart link on every start if turned on in preferences.
+* GODT-1055 Fix flaky empty trash test.
+
+
+## [Bridge 1.6.5] HZM
+
+### Changed
+* GODT-1059 Check if keychain is usable on linux before using it by default.
+
+
+## [Bridge 1.6.4] HZM
+
+### Added
+* Other: Autoupdates CLI commands.
+
+### Removed
+* Other: Remove credits.
+
+### Changed
+* GODT-980 Placeholder for user agent.
+* GODT-1036 Event loop Sentry reporting of failures and refresh.
+* GODT-957 Increase space to hide difference.
+* GODT-937 Add keychain switcher to frontend.
+* GODT-1008 Fix transparent dialog under certain conditions.
+* GODT-1034 More tolerant connection speed detection.
+* GODT-1018 Pre-push git hook to check lints.
+* Other: Make all command line flags as const strings.
+* GODT-1041 Log IMAP requests to debug Apple Mail re-sync issue.
+* Other: Pretty print prefs.json.
+
+### Fixed
+* Other: Fix nogui build.
+* GODT-317 Fix wrong total mailbox size in Apple Mail.
+* Other: Fixing changelog punctuation.
+* GODT-797 APPEND waits for EXPUNGE to prevent data loss when Outlook moves from Spam or Trash.
+
+
 ## [Bridge 1.6.3] HZM
 
 ### Added
@@ -10,15 +143,15 @@ Changelog [format](http://keepachangelog.com/en/1.0.0/)
 ### Changed
 * GODT-885 Do not explicitly unlabel folders during move to match behaviour of other clients.
 * GODT-616 Better user message about wrong mailbox password.
-* GODT-1021 Do not allow copy Inbox->Sent or Sent->Inbox
+* GODT-1021 Do not allow copy Inbox->Sent or Sent->Inbox.
-* GODT-976 Exclude updates from clearing cache and clear cache, including updates, while switching early access off
+* GODT-976 Exclude updates from clearing cache and clear cache, including updates, while switching early access off.
-* GODT-1033 Retry starting IMAP server after connection was down
+* GODT-1033 Retry starting IMAP server after connection was down.
 
 ### Fixed
 * GODT-1011 Stable integration test deleting many messages using UID EXPUNGE.
 * GODT-1015 Use lenient version parser to properly parse version provided by Mac.
 * GODT-919 Notify about update right after the start.
-* GODT-919 GODT-1022 Logs and signals
+* GODT-919 GODT-1022 Logs and signals.
 
 
 ## [IE 1.3.0] Farg

Makefile

@@ -10,8 +10,8 @@ TARGET_OS?=${GOOS}
 .PHONY: build build-ie build-nogui build-ie-nogui build-launcher build-launcher-ie  versioner hasher
 
 # Keep version hardcoded so app build works also without Git repository.
-BRIDGE_APP_VERSION?=1.6.3+git
+BRIDGE_APP_VERSION?=1.7.0+git
-IE_APP_VERSION?=1.3.0+git
+IE_APP_VERSION?=1.3.3+git
 APP_VERSION:=${BRIDGE_APP_VERSION}
 SRC_ICO:=logo.ico
 SRC_ICNS:=Bridge.icns
@@ -19,6 +19,7 @@ SRC_SVG:=logo.svg
 TGT_ICNS:=Bridge.icns
 EXE_NAME:=proton-bridge
 CONFIGNAME:=bridge
+WINDRES_DEFINE:=BUILD_BRIDGE
 ifeq "${TARGET_CMD}" "Import-Export"
     APP_VERSION:=${IE_APP_VERSION}
     SRC_ICO:=ie.ico
@@ -27,13 +28,14 @@ ifeq "${TARGET_CMD}" "Import-Export"
     TGT_ICNS:=ImportExport.icns
     EXE_NAME:=proton-ie
     CONFIGNAME:=importExport
+	WINDRES_DEFINE:=BUILD_IE
 endif
 REVISION:=$(shell git rev-parse --short=10 HEAD)
 BUILD_TIME:=$(shell date +%FT%T%z)
 
 BUILD_FLAGS:=-tags='${BUILD_TAGS}'
 BUILD_FLAGS_LAUNCHER:=${BUILD_FLAGS}
-BUILD_FLAGS_NOGUI:=-tags='${BUILD_TAGS} nogui'
+BUILD_FLAGS_GUI:=-tags='${BUILD_TAGS} build_qt'
 GO_LDFLAGS:=$(addprefix -X github.com/ProtonMail/proton-bridge/internal/constants.,Version=${APP_VERSION} Revision=${REVISION} BuildTime=${BUILD_TIME})
 ifneq "${BUILD_LDFLAGS}" ""
     GO_LDFLAGS+=${BUILD_LDFLAGS}
@@ -45,7 +47,7 @@ ifeq "${TARGET_OS}" "windows"
 endif
 
 BUILD_FLAGS+=-ldflags '${GO_LDFLAGS}'
-BUILD_FLAGS_NOGUI+=-ldflags '${GO_LDFLAGS}'
+BUILD_FLAGS_GUI+=-ldflags '${GO_LDFLAGS}'
 BUILD_FLAGS_LAUNCHER+=-ldflags '${GO_LDFLAGS_LAUNCHER}'
 
 DEPLOY_DIR:=cmd/${TARGET_CMD}/deploy
@@ -56,7 +58,7 @@ EXE_QT:=${DIRNAME}
 ifeq "${TARGET_OS}" "windows"
     EXE:=${EXE}.exe
     EXE_QT:=${EXE_QT}.exe
-    ICO_FILES:=${SRC_ICO} icon.rc icon_windows.syso
+    RESOURCE_FILE:=resource.syso
 endif
 ifeq "${TARGET_OS}" "darwin"
     DARWINAPP_CONTENTS:=${DEPLOY_DIR}/darwin/${EXE}.app/Contents
@@ -83,14 +85,20 @@ build: ${TGZ_TARGET}
 build-ie:
 	TARGET_CMD=Import-Export $(MAKE) build
 
-build-nogui:
+build-nogui: gofiles
-	go build ${BUILD_FLAGS_NOGUI} -o ${EXE_NAME} cmd/${TARGET_CMD}/main.go
+	go build ${BUILD_FLAGS} -o ${EXE_NAME} cmd/${TARGET_CMD}/main.go
 
 build-ie-nogui:
 	TARGET_CMD=Import-Export $(MAKE) build-nogui
 
-build-launcher:
+ifeq "${GOOS}" "windows"
-	go build ${BUILD_FLAGS_LAUNCHER} -o launcher-${APP} cmd/launcher/main.go
+  	PRERESOURCECMD:=cp ./resource.syso ./cmd/launcher/resource.syso
+	POSTRESOURCECMD:=rm -f ./cmd/launcher/resource.syso
+endif
+build-launcher: ${RESOURCE_FILE}
+	${PRERESOURCECMD}
+	go build ${BUILD_FLAGS_LAUNCHER} -o launcher-${EXE} ./cmd/launcher/
+	${POSTRESOURCECMD}
 
 build-launcher-ie:
 	TARGET_CMD=Import-Export $(MAKE) build-launcher
@@ -134,21 +142,20 @@ ifneq "${GOOS}" "${TARGET_OS}"
   endif
 endif
 
-${EXE_TARGET}: check-has-go gofiles ${ICO_FILES} ${VENDOR_TARGET}
+${EXE_TARGET}: check-has-go gofiles ${RESOURCE_FILE} ${VENDOR_TARGET}
 	rm -rf deploy ${TARGET_OS} ${DEPLOY_DIR}
 	cp cmd/${TARGET_CMD}/main.go .
-	qtdeploy ${BUILD_FLAGS} ${QT_BUILD_TARGET}
+	qtdeploy ${BUILD_FLAGS_GUI} ${QT_BUILD_TARGET}
 	mv deploy cmd/${TARGET_CMD}
 	if [ "${EXE_QT_TARGET}" != "${EXE_TARGET}" ]; then mv ${EXE_QT_TARGET} ${EXE_TARGET}; fi
 	rm -rf ${TARGET_OS} main.go
 
-logo.ico ie.ico: ./internal/frontend/share/icons/${SRC_ICO}
-	cp $^ $@
-icon.rc: ./internal/frontend/share/icon.rc
-	cp $^ .
-icon_windows.syso: icon.rc logo.ico
-	windres --target=pe-x86-64 -o $@ $<
 
+WINDRES_YEAR:=$(shell date +%Y)
+APP_VERSION_COMMA:=$(shell echo "${APP_VERSION}" | sed -e 's/[^0-9,.]*//g' -e 's/\./,/g')
+resource.syso: ./internal/frontend/share/info.rc ./internal/frontend/share/icons/${SRC_ICO} .FORCE
+	rm -f ./*.syso
+	windres --target=pe-x86-64 -I ./internal/frontend/share/icons/ -D ${WINDRES_DEFINE} -D ICO_FILE=${SRC_ICO} -D EXE_NAME="${EXE_NAME}" -D FILE_VERSION="${APP_VERSION}" -D ORIGINAL_FILE_NAME="${EXE}" -D PRODUCT_VERSION="${APP_VERSION}" -D FILE_VERSION_COMMA=${APP_VERSION_COMMA} -D YEAR=${WINDRES_YEAR} -o $@ $<
 
 ## Rules for therecipe/qt
 .PHONY: prepare-vendor update-vendor update-qt-docs
@@ -158,6 +165,7 @@ THERECIPE_ENV:=github.com/therecipe/env_${TARGET_OS}_amd64_513
 # therecipe/env in order to download it only once
 vendor-cache/${THERECIPE_ENV}:
 	git clone https://${THERECIPE_ENV}.git vendor-cache/${THERECIPE_ENV}
+	if [ "${TARGET_OS}" == "darwin" ]; then cp -f "./utils/QTBUG-88600/libqcocoa.dylib" "./vendor-cache/${THERECIPE_ENV}/5.13.0/clang_64/plugins/platforms/"; fi;
 
 # The command used to make symlinks is different on windows.
 # So if the GOOS is windows and we aren't crossbuilding (in which case the host os would still be *nix)
@@ -180,8 +188,8 @@ update-qt-docs:
 	go get github.com/therecipe/qt/internal/binding/files/docs/$(QT_API)
 
 ## Dev dependencies
-.PHONY: install-devel-tools install-linter install-go-mod-outdated
+.PHONY: install-devel-tools install-linter install-go-mod-outdated install-git-hooks
-LINTVER:="v1.29.0"
+LINTVER:="v1.39.0"
 LINTSRC:="https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh"
 
 install-dev-dependencies: install-devel-tools install-linter install-go-mod-outdated
@@ -197,6 +205,9 @@ install-linter: check-has-go
 install-go-mod-outdated:
 	which go-mod-outdated || go get -u github.com/psampaz/go-mod-outdated
 
+install-git-hooks:
+	cp utils/githooks/* .git/hooks/
+	chmod +x .git/hooks/*
 
 ## Checks, mocks and docs
 .PHONY: check-has-go add-license change-copyright-year test bench coverage mocks lint-license lint-golang lint updates doc release-notes
@@ -247,16 +258,16 @@ mocks:
 	mockgen --package mocks github.com/ProtonMail/proton-bridge/internal/transfer PanicHandler,ClientManager,IMAPClientProvider > internal/transfer/mocks/mocks.go
 	mockgen --package mocks github.com/ProtonMail/proton-bridge/internal/store PanicHandler,ClientManager,BridgeUser,ChangeNotifier > internal/store/mocks/mocks.go
 	mockgen --package mocks github.com/ProtonMail/proton-bridge/pkg/listener Listener > internal/store/mocks/utils_mocks.go
+	mockgen --package mocks github.com/ProtonMail/proton-bridge/pkg/message Fetcher > pkg/message/mocks/mocks.go
 	mockgen --package mocks github.com/ProtonMail/proton-bridge/pkg/pmapi Client > pkg/pmapi/mocks/mocks.go
 
-lint: lint-golang lint-license lint-changelog
+lint: gofiles lint-golang lint-license lint-changelog
 
 lint-license:
 	./utils/missing_license.sh check
 
 lint-changelog:
 	./utils/changelog_linter.sh Changelog.md
-	./utils/changelog_linter.sh unreleased.md
 
 lint-golang:
 	which golangci-lint || $(MAKE) install-linter
@@ -292,6 +303,7 @@ LOG?=debug
 LOG_IMAP?=client # client/server/all, or empty to turn it off
 LOG_SMTP?=--log-smtp # empty to turn it off
 RUN_FLAGS?=-m -l=${LOG} --log-imap=${LOG_IMAP} ${LOG_SMTP}
+RUN_FLAGS_IE?=-m -l=${LOG}
 
 run: run-nogui-cli
 
@@ -301,12 +313,12 @@ run-qt-cli: ${EXE_TARGET}
 	PROTONMAIL_ENV=dev ./$< ${RUN_FLAGS} -c
 
 run-nogui: clean-vendor gofiles
-	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS_NOGUI} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} | tee last.log
+	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} | tee last.log
 run-nogui-cli: clean-vendor gofiles
-	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS_NOGUI} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} -c
+	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} -c
 
 run-debug:
-	PROTONMAIL_ENV=dev dlv debug --build-flags "${BUILD_FLAGS_NOGUI}" cmd/${TARGET_CMD}/main.go -- ${RUN_FLAGS}
+	PROTONMAIL_ENV=dev dlv debug --build-flags "${BUILD_FLAGS}" cmd/${TARGET_CMD}/main.go -- ${RUN_FLAGS}
 
 run-qml-preview:
 	$(MAKE) -C internal/frontend/qt -f Makefile.local qmlpreview
@@ -314,11 +326,11 @@ run-ie-qml-preview:
 	$(MAKE) -C internal/frontend/qt-ie -f Makefile.local qmlpreview
 
 run-ie:
-	TARGET_CMD=Import-Export $(MAKE) run
+	TARGET_CMD=Import-Export RUN_FLAGS="${RUN_FLAGS_IE}" $(MAKE) run
 run-ie-qt:
-	TARGET_CMD=Import-Export $(MAKE) run-qt
+	TARGET_CMD=Import-Export RUN_FLAGS="${RUN_FLAGS_IE}" $(MAKE) run-qt
 run-ie-nogui:
-	TARGET_CMD=Import-Export $(MAKE) run-nogui
+	TARGET_CMD=Import-Export RUN_FLAGS="${RUN_FLAGS_IE}" $(MAKE) run-nogui
 
 clean-frontend-qt:
 	$(MAKE) -C internal/frontend/qt -f Makefile.local clean
@@ -335,7 +347,7 @@ clean: clean-vendor
 	rm -rf cmd/Desktop-Bridge/deploy
 	rm -rf cmd/Import-Export/deploy
 	rm -f build last.log mem.pprof main.go
-	rm -rf logo.ico icon.rc icon_windows.syso internal/frontend/qt/icon_windows.syso
+	rm -f resource.syso
 	rm -f release-notes/bridge.html
 	rm -f release-notes/import-export.html
 
@@ -343,3 +355,5 @@ clean: clean-vendor
 generate:
 	go generate ./...
 	$(MAKE) add-license
+
+.FORCE:

cmd/launcher/main.go

@@ -25,13 +25,14 @@ import (
 	"runtime"
 
 	"github.com/ProtonMail/gopenpgp/v2/crypto"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/constants"
 	"github.com/ProtonMail/proton-bridge/internal/crash"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/logging"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/ProtonMail/proton-bridge/internal/versioner"
-	"github.com/ProtonMail/proton-bridge/pkg/sentry"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -44,7 +45,7 @@ var (
 )
 
 func main() { // nolint[funlen]
-	reporter := sentry.NewReporter(appName, constants.Version)
+	reporter := sentry.NewReporter(appName, constants.Version, useragent.New())
 
 	crashHandler := crash.NewHandler(reporter.ReportException)
 	defer crashHandler.HandlePanic()

go.mod

@@ -6,7 +6,7 @@ go 1.13
 // They are in a separate require block to highlight this.
 require (
 	github.com/docker/docker-credential-helpers v0.6.3
-	github.com/emersion/go-imap v1.0.6-0.20200708083111-011063d6c9df
+	github.com/emersion/go-imap v1.0.6
 	github.com/jameskeane/bcrypt v0.0.0-20170924085257-7509ea014998
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
 )
@@ -29,7 +29,7 @@ require (
 	github.com/emersion/go-imap-appendlimit v0.0.0-20190308131241-25671c986a6a
 	github.com/emersion/go-imap-idle v0.0.0-20200601154248-f05f54664cc4
 	github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342
-	github.com/emersion/go-imap-quota v0.0.0-20200423100218-dcfd1b7d2b41
+	github.com/emersion/go-imap-quota v0.0.0-20210203125329-619074823f3c
 	github.com/emersion/go-imap-unselect v0.0.0-20171113212723-b985794e5f26
 	github.com/emersion/go-mbox v1.0.2
 	github.com/emersion/go-message v0.12.1-0.20201221184100-40c3f864532b

go.sum

@@ -77,8 +77,8 @@ github.com/emersion/go-imap-idle v0.0.0-20200601154248-f05f54664cc4 h1:/JIALzmCd
 github.com/emersion/go-imap-idle v0.0.0-20200601154248-f05f54664cc4/go.mod h1:o14zPKCmEH5WC1vU5SdPoZGgNvQx7zzKSnxPQlobo78=
 github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342 h1:5p1t3e1PomYgLWwEwhwEU5kVBwcyAcVrOpexv8AeZx0=
 github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342/go.mod h1:QuMaZcKFDVI0yCrnAbPLfbwllz1wtOrZH8/vZ5yzp4w=
-github.com/emersion/go-imap-quota v0.0.0-20200423100218-dcfd1b7d2b41 h1:z5lDGnSURauBEDdNLj3o0+HogVYKQCGeY3Anl/xyRfU=
+github.com/emersion/go-imap-quota v0.0.0-20210203125329-619074823f3c h1:khcEdu1yFiZjBgi7gGnQiLhpSgghJ0YTnKD0l4EUqqc=
-github.com/emersion/go-imap-quota v0.0.0-20200423100218-dcfd1b7d2b41/go.mod h1:iApyhIQBiU4XFyr+3kdJyyGqle82TbQyuP2o+OZHrV0=
+github.com/emersion/go-imap-quota v0.0.0-20210203125329-619074823f3c/go.mod h1:iApyhIQBiU4XFyr+3kdJyyGqle82TbQyuP2o+OZHrV0=
 github.com/emersion/go-imap-unselect v0.0.0-20171113212723-b985794e5f26 h1:FiSb8+XBQQSkcX3ubr+1tAtlRJBYaFmRZqOAweZ9Wy8=
 github.com/emersion/go-imap-unselect v0.0.0-20171113212723-b985794e5f26/go.mod h1:+gnnZx3Mg3MnCzZrv0eZdp5puxXQUgGT/6N6L7ShKfM=
 github.com/emersion/go-mbox v1.0.2 h1:tE/rT+lEugK9y0myEymCCHnwlZN04hlXPrbKkxRBA5I=

internal/app/base/base.go

@@ -43,38 +43,55 @@ import (
 	"github.com/ProtonMail/proton-bridge/internal/config/cache"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
 	"github.com/ProtonMail/proton-bridge/internal/config/tls"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/constants"
 	"github.com/ProtonMail/proton-bridge/internal/cookies"
 	"github.com/ProtonMail/proton-bridge/internal/crash"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/logging"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/ProtonMail/proton-bridge/internal/users/credentials"
 	"github.com/ProtonMail/proton-bridge/internal/versioner"
 	"github.com/ProtonMail/proton-bridge/pkg/keychain"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
-	"github.com/ProtonMail/proton-bridge/pkg/sentry"
 	"github.com/allan-simon/go-singleinstance"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 )
 
+const (
+	flagCPUProfile      = "cpu-prof"
+	flagCPUProfileShort = "p"
+	flagMemProfile      = "mem-prof"
+	flagMemProfileShort = "m"
+	flagLogLevel        = "log-level"
+	flagLogLevelShort   = "l"
+	// FlagCLI indicate to start with command line interface.
+	FlagCLI      = "cli"
+	flagCLIShort = "c"
+	flagRestart  = "restart"
+	flagLauncher = "launcher"
+)
+
 type Base struct {
-	CrashHandler *crash.Handler
+	SentryReporter *sentry.Reporter
-	Locations    *locations.Locations
+	CrashHandler   *crash.Handler
-	Settings     *settings.Settings
+	Locations      *locations.Locations
-	Lock         *os.File
+	Settings       *settings.Settings
-	Cache        *cache.Cache
+	Lock           *os.File
-	Listener     listener.Listener
+	Cache          *cache.Cache
-	Creds        *credentials.Store
+	Listener       listener.Listener
-	CM           *pmapi.ClientManager
+	Creds          *credentials.Store
-	CookieJar    *cookies.Jar
+	CM             *pmapi.ClientManager
-	Updater      *updater.Updater
+	CookieJar      *cookies.Jar
-	Versioner    *versioner.Versioner
+	UserAgent      *useragent.UserAgent
-	TLS          *tls.TLS
+	Updater        *updater.Updater
-	Autostart    *autostart.App
+	Versioner      *versioner.Versioner
+	TLS            *tls.TLS
+	Autostart      *autostart.App
 
 	Name    string // the app's name
 	usage   string // the app's usage description
@@ -92,7 +109,10 @@ func New( // nolint[funlen]
 	keychainName,
 	cacheVersion string,
 ) (*Base, error) {
-	sentryReporter := sentry.NewReporter(appName, constants.Version)
+	userAgent := useragent.New()
+
+	sentryReporter := sentry.NewReporter(appName, constants.Version, userAgent)
+
 	crashHandler := crash.NewHandler(
 		sentryReporter.ReportException,
 		crash.ShowErrorNotification(appName),
@@ -166,20 +186,9 @@ func New( // nolint[funlen]
 		return nil, err
 	}
 
-	apiConfig := pmapi.GetAPIConfig(configName, constants.Version)
+	cm := pmapi.NewClientManager(getAPIConfig(configName, listener), userAgent)
-	apiConfig.ConnectionOffHandler = func() {
-		listener.Emit(events.InternetOffEvent, "")
-	}
-	apiConfig.ConnectionOnHandler = func() {
-		listener.Emit(events.InternetOnEvent, "")
-	}
-	apiConfig.UpgradeApplicationHandler = func() {
-		listener.Emit(events.UpgradeApplicationEvent, "")
-	}
-	cm := pmapi.NewClientManager(apiConfig)
 	cm.SetRoundTripper(pmapi.GetRoundTripper(cm, listener))
 	cm.SetCookieJar(jar)
-	sentryReporter.SetUserAgentProvider(cm)
 
 	key, err := crypto.NewKeyFromArmored(updater.DefaultPublicKey)
 	if err != nil {
@@ -220,19 +229,21 @@ func New( // nolint[funlen]
 	}
 
 	return &Base{
-		CrashHandler: crashHandler,
+		SentryReporter: sentryReporter,
-		Locations:    locations,
+		CrashHandler:   crashHandler,
-		Settings:     settingsObj,
+		Locations:      locations,
-		Lock:         lock,
+		Settings:       settingsObj,
-		Cache:        cache,
+		Lock:           lock,
-		Listener:     listener,
+		Cache:          cache,
-		Creds:        credentials.NewStore(kc),
+		Listener:       listener,
-		CM:           cm,
+		Creds:          credentials.NewStore(kc),
-		CookieJar:    jar,
+		CM:             cm,
-		Updater:      updater,
+		CookieJar:      jar,
-		Versioner:    versioner,
+		UserAgent:      userAgent,
-		TLS:          tls.New(settingsPath),
+		Updater:        updater,
-		Autostart:    autostart,
+		Versioner:      versioner,
+		TLS:            tls.New(settingsPath),
+		Autostart:      autostart,
 
 		Name:  appName,
 		usage: appUsage,
@@ -252,32 +263,32 @@ func (b *Base) NewApp(action func(*Base, *cli.Context) error) *cli.App {
 	app.Action = b.run(action)
 	app.Flags = []cli.Flag{
 		&cli.BoolFlag{
-			Name:    "cpu-prof",
+			Name:    flagCPUProfile,
-			Aliases: []string{"p"},
+			Aliases: []string{flagCPUProfileShort},
 			Usage:   "Generate CPU profile",
 		},
 		&cli.BoolFlag{
-			Name:    "mem-prof",
+			Name:    flagMemProfile,
-			Aliases: []string{"m"},
+			Aliases: []string{flagMemProfileShort},
 			Usage:   "Generate memory profile",
 		},
 		&cli.StringFlag{
-			Name:    "log-level",
+			Name:    flagLogLevel,
-			Aliases: []string{"l"},
+			Aliases: []string{flagLogLevelShort},
 			Usage:   "Set the log level (one of panic, fatal, error, warn, info, debug)",
 		},
 		&cli.BoolFlag{
-			Name:    "cli",
+			Name:    FlagCLI,
-			Aliases: []string{"c"},
+			Aliases: []string{flagCLIShort},
 			Usage:   "Use command line interface",
 		},
 		&cli.StringFlag{
-			Name:   "restart",
+			Name:   flagRestart,
 			Usage:  "The number of times the application has already restarted",
 			Hidden: true,
 		},
 		&cli.StringFlag{
-			Name:   "launcher",
+			Name:   flagLauncher,
 			Usage:  "The launcher to use to restart the application",
 			Hidden: true,
 		},
@@ -302,21 +313,21 @@ func (b *Base) run(appMainLoop func(*Base, *cli.Context) error) cli.ActionFunc {
 		defer func() { _ = b.Lock.Close() }()
 
 		// If launcher was used to start the app, use that for restart/autostart.
-		if launcher := c.String("launcher"); launcher != "" {
+		if launcher := c.String(flagLauncher); launcher != "" {
 			b.Autostart.Exec = []string{launcher}
 			b.command = launcher
 		}
 
-		if doCPUProfile := c.Bool("cpu-prof"); doCPUProfile {
+		if c.Bool(flagCPUProfile) {
 			startCPUProfile()
 			defer pprof.StopCPUProfile()
 		}
 
-		if doMemoryProfile := c.Bool("mem-prof"); doMemoryProfile {
+		if c.Bool(flagMemProfile) {
 			defer makeMemoryProfile()
 		}
 
-		logging.SetLevel(c.String("log-level"))
+		logging.SetLevel(c.String(flagLogLevel))
 
 		logrus.
 			WithField("appName", b.Name).
@@ -328,7 +339,7 @@ func (b *Base) run(appMainLoop func(*Base, *cli.Context) error) cli.ActionFunc {
 			Info("Run app")
 
 		b.CrashHandler.AddRecoveryAction(func(interface{}) error {
-			if c.Int("restart") > maxAllowedRestarts {
+			if c.Int(flagRestart) > maxAllowedRestarts {
 				logrus.
 					WithField("restart", c.Int("restart")).
 					Warn("Not restarting, already restarted too many times")
@@ -364,3 +375,13 @@ func (b *Base) doTeardown() error {
 
 	return nil
 }
+
+func getAPIConfig(configName string, listener listener.Listener) *pmapi.ClientConfig {
+	apiConfig := pmapi.GetAPIConfig(configName, constants.Version)
+
+	apiConfig.ConnectionOffHandler = func() { listener.Emit(events.InternetOffEvent, "") }
+	apiConfig.ConnectionOnHandler = func() { listener.Emit(events.InternetOnEvent, "") }
+	apiConfig.UpgradeApplicationHandler = func() { listener.Emit(events.UpgradeApplicationEvent, "") }
+
+	return apiConfig
+}

internal/app/base/migration.go

@@ -29,10 +29,12 @@ import (
 // migrateFiles migrates files from their old (pre-refactor) locations to their new locations.
 // We can remove this eventually.
 //
-// | entity |               old location                |            new location                |
+// | entity    |               old location                |            new location                |
-// |--------|-------------------------------------------|----------------------------------------|
+// |-----------|-------------------------------------------|----------------------------------------|
-// | prefs  | ~/.cache/protonmail/<app>/c11/prefs.json  | ~/.config/protonmail/<app>/prefs.json  |
+// | prefs     | ~/.cache/protonmail/<app>/c11/prefs.json  | ~/.config/protonmail/<app>/prefs.json  |
-// | c11    | ~/.cache/protonmail/<app>/c11             | ~/.cache/protonmail/<app>/cache/c11    |
+// | c11 1.5.x | ~/.cache/protonmail/<app>/c11             | ~/.cache/protonmail/<app>/cache/c11    |
+// | c11 1.6.x | ~/.cache/protonmail/<app>/cache/c11       | ~/.config/protonmail/<app>/cache/c11   |
+// | updates   | ~/.cache/protonmail/<app>/updates         | ~/.config/protonmail/<app>/updates     |.
 func migrateFiles(configName string) error {
 	locationsProvider, err := locations.NewDefaultProvider(filepath.Join(constants.VendorName, configName))
 	if err != nil {
@@ -41,43 +43,89 @@ func migrateFiles(configName string) error {
 
 	locations := locations.New(locationsProvider, configName)
 	userCacheDir := locationsProvider.UserCache()
+
+	if err := migratePrefsFrom15x(locations, userCacheDir); err != nil {
+		return err
+	}
+	if err := migrateCacheFromBoth15xAnd16x(locations, userCacheDir); err != nil {
+		return err
+	}
+	if err := migrateUpdatesFrom16x(configName, locations); err != nil { //nolint[revive] It is more clear to structure this way
+		return err
+	}
+	return nil
+}
+
+func migratePrefsFrom15x(locations *locations.Locations, userCacheDir string) error {
 	newSettingsDir, err := locations.ProvideSettingsPath()
 	if err != nil {
 		return err
 	}
 
-	if err := moveIfExists(
+	return moveIfExists(
 		filepath.Join(userCacheDir, "c11", "prefs.json"),
 		filepath.Join(newSettingsDir, "prefs.json"),
-	); err != nil {
+	)
-		return err
+}
-	}
 
-	newCacheDir, err := locations.ProvideCachePath()
+func migrateCacheFromBoth15xAnd16x(locations *locations.Locations, userCacheDir string) error {
+	olderCacheDir := userCacheDir
+	newerCacheDir := locations.GetOldCachePath()
+	latestCacheDir, err := locations.ProvideCachePath()
 	if err != nil {
 		return err
 	}
 
+	// Migration for versions before 1.6.x.
 	if err := moveIfExists(
-		filepath.Join(userCacheDir, "c11"),
+		filepath.Join(olderCacheDir, "c11"),
-		filepath.Join(newCacheDir, "c11"),
+		filepath.Join(latestCacheDir, "c11"),
 	); err != nil {
 		return err
 	}
 
-	return nil
+	// Migration for versions 1.6.x.
+	return moveIfExists(
+		filepath.Join(newerCacheDir, "c11"),
+		filepath.Join(latestCacheDir, "c11"),
+	)
+}
+
+func migrateUpdatesFrom16x(configName string, locations *locations.Locations) error {
+	// In order to properly update Bridge 1.6.X and higher we need to
+	// change the launcher first. Since this is not part of automatic
+	// updates the migration must wait until manual update. Until that
+	// we need to keep old path.
+	if configName == "bridge" {
+		return nil
+	}
+
+	oldUpdatesPath := locations.GetOldUpdatesPath()
+	// Do not use ProvideUpdatesPath, that creates dir right away.
+	newUpdatesPath := locations.GetUpdatesPath()
+
+	return moveIfExists(oldUpdatesPath, newUpdatesPath)
 }
 
 func moveIfExists(source, destination string) error {
+	l := logrus.WithField("source", source).WithField("destination", destination)
+
 	if _, err := os.Stat(source); os.IsNotExist(err) {
-		logrus.WithField("source", source).WithField("destination", destination).Debug("No need to migrate file")
+		l.Info("No need to migrate file, source doesn't exist")
 		return nil
 	}
 
 	if _, err := os.Stat(destination); !os.IsNotExist(err) {
-		logrus.WithField("source", source).WithField("destination", destination).Debug("No need to migrate file")
+		// Once migrated, files should not stay in source anymore. Therefore
+		// if some files are still in source location but target already exist,
+		// it's suspicious. Could happen by installing new version, then the
+		// old one because of some reason, and then the new one again.
+		// Good to see as warning because it could be a reason why Bridge is
+		// behaving weirdly, like wrong configuration, or db re-sync and so on.
+		l.Warn("No need to migrate file, target already exists")
 		return nil
 	}
 
+	l.Info("Migrating files")
 	return os.Rename(source, destination)
 }

internal/app/bridge/bridge.go

@@ -38,21 +38,28 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
+const (
+	flagLogIMAP        = "log-imap"
+	flagLogSMTP        = "log-smtp"
+	flagNoWindow       = "no-window"
+	flagNonInteractive = "noninteractive"
+)
+
 func New(base *base.Base) *cli.App {
 	app := base.NewApp(run)
 
 	app.Flags = append(app.Flags, []cli.Flag{
 		&cli.StringFlag{
-			Name:  "log-imap",
+			Name:  flagLogIMAP,
 			Usage: "Enable logging of IMAP communications (all|client|server) (may contain decrypted data!)"},
 		&cli.BoolFlag{
-			Name:  "log-smtp",
+			Name:  flagLogSMTP,
 			Usage: "Enable logging of SMTP communications (may contain decrypted data!)"},
 		&cli.BoolFlag{
-			Name:  "no-window",
+			Name:  flagNoWindow,
 			Usage: "Don't show window after start"},
 		&cli.BoolFlag{
-			Name:  "noninteractive",
+			Name:  flagNonInteractive,
 			Usage: "Start Bridge entirely noninteractively"},
 	}...)
 
@@ -64,8 +71,7 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 	if err != nil {
 		logrus.WithError(err).Fatal("Failed to load TLS config")
 	}
-
+	bridge := bridge.New(b.Locations, b.Cache, b.Settings, b.SentryReporter, b.CrashHandler, b.Listener, b.CM, b.Creds, b.Updater, b.Versioner)
-	bridge := bridge.New(b.Locations, b.Cache, b.Settings, b.CrashHandler, b.Listener, b.CM, b.Creds, b.Updater, b.Versioner)
 	imapBackend := imap.NewIMAPBackend(b.CrashHandler, b.Listener, b.Cache, bridge)
 	smtpBackend := smtp.NewSMTPBackend(b.CrashHandler, b.Listener, b.Settings, bridge)
 
@@ -79,9 +85,9 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 		imapPort := b.Settings.GetInt(settings.IMAPPortKey)
 		imap.NewIMAPServer(
 			b.CrashHandler,
-			c.String("log-imap") == "client" || c.String("log-imap") == "all",
+			c.String(flagLogIMAP) == "client" || c.String(flagLogIMAP) == "all",
-			c.String("log-imap") == "server" || c.String("log-imap") == "all",
+			c.String(flagLogIMAP) == "server" || c.String(flagLogIMAP) == "all",
-			imapPort, tlsConfig, imapBackend, b.Listener).ListenAndServe()
+			imapPort, tlsConfig, imapBackend, b.UserAgent, b.Listener).ListenAndServe()
 	}()
 
 	go func() {
@@ -89,12 +95,12 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 		smtpPort := b.Settings.GetInt(settings.SMTPPortKey)
 		useSSL := b.Settings.GetBool(settings.SMTPSSLKey)
 		smtp.NewSMTPServer(
-			c.Bool("log-smtp"),
+			c.Bool(flagLogSMTP),
 			smtpPort, useSSL, tlsConfig, smtpBackend, b.Listener).ListenAndServe()
 	}()
 
 	// Bridge supports no-window option which we should use for autostart.
-	b.Autostart.Exec = append(b.Autostart.Exec, "--no-window")
+	b.Autostart.Exec = append(b.Autostart.Exec, "--"+flagNoWindow)
 
 	// We want to remove old versions if the app exits successfully.
 	b.AddTeardownAction(b.Versioner.RemoveOldVersions)
@@ -105,9 +111,9 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 	var frontendMode string
 
 	switch {
-	case c.Bool("cli"):
+	case c.Bool(base.FlagCLI):
 		frontendMode = "cli"
-	case c.Bool("noninteractive"):
+	case c.Bool(flagNonInteractive):
 		return <-(make(chan error)) // Block forever.
 	default:
 		frontendMode = "qt"
@@ -118,12 +124,13 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 		constants.BuildVersion,
 		b.Name,
 		frontendMode,
-		!c.Bool("no-window"),
+		!c.Bool(flagNoWindow),
 		b.CrashHandler,
 		b.Locations,
 		b.Settings,
 		b.Listener,
 		b.Updater,
+		b.UserAgent,
 		bridge,
 		smtpBackend,
 		b.Autostart,
@@ -132,7 +139,7 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 
 	// Watch for updates routine
 	go func() {
-		ticker := time.NewTicker(time.Hour)
+		ticker := time.NewTicker(constants.UpdateCheckInterval)
 
 		for {
 			checkAndHandleUpdate(b.Updater, f, b.Settings.GetBool(settings.AutoUpdateKey))
@@ -182,9 +189,10 @@ func generateTLSCerts(b *base.Base) error {
 }
 
 func checkAndHandleUpdate(u types.Updater, f frontend.Frontend, autoUpdate bool) {
+	log := logrus.WithField("pkg", "app/bridge")
 	version, err := u.Check()
 	if err != nil {
-		logrus.WithError(err).Error("An error occurred while checking for updates")
+		log.WithError(err).Error("An error occurred while checking for updates")
 		return
 	}
 
@@ -194,11 +202,11 @@ func checkAndHandleUpdate(u types.Updater, f frontend.Frontend, autoUpdate bool)
 	f.SetVersion(version)
 
 	if !u.IsUpdateApplicable(version) {
-		logrus.Debug("No need to update")
+		log.Info("No need to update")
 		return
 	}
 
-	logrus.WithField("version", version.Version).Info("An update is available")
+	log.WithField("version", version.Version).Info("An update is available")
 
 	if !autoUpdate {
 		f.NotifyManualUpdate(version, u.CanInstall(version))
@@ -206,16 +214,16 @@ func checkAndHandleUpdate(u types.Updater, f frontend.Frontend, autoUpdate bool)
 	}
 
 	if !u.CanInstall(version) {
-		logrus.Info("A manual update is required")
+		log.Info("A manual update is required")
 		f.NotifySilentUpdateError(updater.ErrManualUpdateRequired)
 		return
 	}
 
 	if err := u.InstallUpdate(version); err != nil {
 		if errors.Cause(err) == updater.ErrDownloadVerify {
-			logrus.WithError(err).Warning("Skipping update installation due to temporary error")
+			log.WithError(err).Warning("Skipping update installation due to temporary error")
 		} else {
-			logrus.WithError(err).Error("The update couldn't be installed")
+			log.WithError(err).Error("The update couldn't be installed")
 			f.NotifySilentUpdateError(err)
 		}
 

internal/app/ie/ie.go

@@ -28,8 +28,6 @@ import (
 	"github.com/ProtonMail/proton-bridge/internal/frontend"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/types"
 	"github.com/ProtonMail/proton-bridge/internal/importexport"
-	"github.com/ProtonMail/proton-bridge/internal/updater"
-	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 )
@@ -49,7 +47,7 @@ func run(b *base.Base, c *cli.Context) error {
 	var frontendMode string
 
 	switch {
-	case c.Bool("cli"):
+	case c.Bool(base.FlagCLI):
 		frontendMode = "cli"
 	default:
 		frontendMode = "qt"
@@ -88,10 +86,11 @@ func run(b *base.Base, c *cli.Context) error {
 	return f.Loop()
 }
 
-func checkAndHandleUpdate(u types.Updater, f frontend.Frontend, autoUpdate bool) {
+func checkAndHandleUpdate(u types.Updater, f frontend.Frontend, autoUpdate bool) { //nolint[unparam]
+	log := logrus.WithField("pkg", "app/ie")
 	version, err := u.Check()
 	if err != nil {
-		logrus.WithError(err).Error("An error occurred while checking for updates")
+		log.WithError(err).Error("An error occurred while checking for updates")
 		return
 	}
 
@@ -101,33 +100,11 @@ func checkAndHandleUpdate(u types.Updater, f frontend.Frontend, autoUpdate bool)
 	f.SetVersion(version)
 
 	if !u.IsUpdateApplicable(version) {
-		logrus.Debug("No need to update")
+		log.Info("No need to update")
 		return
 	}
 
-	logrus.WithField("version", version.Version).Info("An update is available")
+	log.WithField("version", version.Version).Info("An update is available")
 
-	if !autoUpdate {
+	f.NotifyManualUpdate(version, u.CanInstall(version))
-		f.NotifyManualUpdate(version, u.CanInstall(version))
-		return
-	}
-
-	if !u.CanInstall(version) {
-		logrus.Info("A manual update is required")
-		f.NotifySilentUpdateError(updater.ErrManualUpdateRequired)
-		return
-	}
-
-	if err := u.InstallUpdate(version); err != nil {
-		if errors.Cause(err) == updater.ErrDownloadVerify {
-			logrus.WithError(err).Warning("Skipping update installation due to temporary error")
-		} else {
-			logrus.WithError(err).Error("The update couldn't be installed")
-			f.NotifySilentUpdateError(err)
-		}
-
-		return
-	}
-
-	f.NotifySilentUpdateInstalled()
 }

internal/bridge/bridge.go

@@ -26,6 +26,7 @@ import (
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
 	"github.com/ProtonMail/proton-bridge/internal/constants"
 	"github.com/ProtonMail/proton-bridge/internal/metrics"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/ProtonMail/proton-bridge/internal/users"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
@@ -46,16 +47,13 @@ type Bridge struct {
 	clientManager users.ClientManager
 	updater       Updater
 	versioner     Versioner
-
-	userAgentClientName    string
-	userAgentClientVersion string
-	userAgentOS            string
 }
 
 func New(
 	locations Locator,
 	cache Cacher,
 	s SettingsProvider,
+	sentryReporter *sentry.Reporter,
 	panicHandler users.PanicHandler,
 	eventListener listener.Listener,
 	clientManager users.ClientManager,
@@ -69,7 +67,7 @@ func New(
 		clientManager.AllowProxy()
 	}
 
-	storeFactory := newStoreFactory(cache, panicHandler, clientManager, eventListener)
+	storeFactory := newStoreFactory(cache, sentryReporter, panicHandler, clientManager, eventListener)
 	u := users.New(locations, panicHandler, eventListener, clientManager, credStorer, storeFactory, true)
 	b := &Bridge{
 		Users: u,
@@ -118,40 +116,6 @@ func (b *Bridge) heartbeat() {
 	}
 }
 
-// GetCurrentClient returns currently connected client (e.g. Thunderbird).
-func (b *Bridge) GetCurrentClient() string {
-	res := b.userAgentClientName
-	if b.userAgentClientVersion != "" {
-		res = res + " " + b.userAgentClientVersion
-	}
-	return res
-}
-
-// SetCurrentClient updates client info (e.g. Thunderbird) and sets the user agent
-// on pmapi. By default no client is used, IMAP has to detect it on first login.
-func (b *Bridge) SetCurrentClient(clientName, clientVersion string) {
-	b.userAgentClientName = clientName
-	b.userAgentClientVersion = clientVersion
-	b.updateUserAgent()
-}
-
-// SetCurrentOS updates OS and sets the user agent on pmapi. By default we use
-// `runtime.GOOS`, but this can be overridden in case of better detection.
-func (b *Bridge) SetCurrentOS(os string) {
-	b.userAgentOS = os
-	b.updateUserAgent()
-}
-
-func (b *Bridge) updateUserAgent() {
-	logrus.
-		WithField("clientName", b.userAgentClientName).
-		WithField("clientVersion", b.userAgentClientVersion).
-		WithField("OS", b.userAgentOS).
-		Info("Updating user agent")
-
-	b.clientManager.SetUserAgent(b.userAgentClientName, b.userAgentClientVersion, b.userAgentOS)
-}
-
 // ReportBug reports a new bug from the user.
 func (b *Bridge) ReportBug(osType, osVersion, description, accountName, address, emailClient string) error {
 	c := b.clientManager.GetAnonymousClient()
@@ -187,26 +151,41 @@ func (b *Bridge) GetUpdateChannel() updater.UpdateChannel {
 // Downgrading to previous version (by switching from early to stable, for example)
 // requires clearing all data including update files due to possibility of
 // inconsistency between versions and absence of backwards migration scripts.
-func (b *Bridge) SetUpdateChannel(channel updater.UpdateChannel) error {
+func (b *Bridge) SetUpdateChannel(channel updater.UpdateChannel) (needRestart bool, err error) {
 	b.settings.Set(settings.UpdateChannelKey, string(channel))
 
 	version, err := b.updater.Check()
 	if err != nil {
-		return err
+		return false, err
 	}
 
-	if b.updater.IsDowngrade(version) {
+	// We have to deal right away only with downgrade - that action needs to
-		if err := b.Users.ClearData(); err != nil {
+	// clear data and updates, and install bridge right away. But regular
-			log.WithError(err).Error("Failed to clear data while downgrading channel")
+	// upgrade can be leaved out for periodic check.
-		}
+	if !b.updater.IsDowngrade(version) {
-		if err := b.locations.ClearUpdates(); err != nil {
+		return false, nil
-			log.WithError(err).Error("Failed to clear updates while downgrading channel")
+	}
-		}
+
+	if err := b.Users.ClearData(); err != nil {
+		log.WithError(err).Error("Failed to clear data while downgrading channel")
+	}
+	if err := b.locations.ClearUpdates(); err != nil {
+		log.WithError(err).Error("Failed to clear updates while downgrading channel")
 	}
 
 	if err := b.updater.InstallUpdate(version); err != nil {
-		return err
+		return false, err
 	}
 
-	return b.versioner.RemoveOtherVersions(version.Version)
+	return true, b.versioner.RemoveOtherVersions(version.Version)
+}
+
+// GetKeychainApp returns current keychain helper.
+func (b *Bridge) GetKeychainApp() string {
+	return b.settings.Get(settings.PreferredKeychainKey)
+}
+
+// SetKeychainApp sets current keychain helper.
+func (b *Bridge) SetKeychainApp(helper string) {
+	b.settings.Set(settings.PreferredKeychainKey, helper)
 }

internal/bridge/credits.go

@@ -1,22 +0,0 @@
-// Copyright (c) 2021 Proton Technologies AG
-//
-// This file is part of ProtonMail Bridge.
-//
-// ProtonMail Bridge is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// ProtonMail Bridge is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
-
-// Code generated by ./credits.sh at Mon Feb 1 10:34:22 CET 2021. DO NOT EDIT.
-
-package bridge
-
-const Credits = "github.com/0xAX/notificator;github.com/Masterminds/semver/v3;github.com/ProtonMail/bcrypt;github.com/ProtonMail/crypto;github.com/ProtonMail/docker-credential-helpers;github.com/ProtonMail/go-autostart;github.com/ProtonMail/go-imap;github.com/ProtonMail/go-imap-id;github.com/ProtonMail/go-rfc5322;github.com/ProtonMail/go-vcard;github.com/ProtonMail/gopenpgp/v2;github.com/PuerkitoBio/goquery;github.com/abiosoft/ishell;github.com/abiosoft/readline;github.com/allan-simon/go-singleinstance;github.com/chzyer/logex;github.com/chzyer/test;github.com/cucumber/godog;github.com/docker/docker-credential-helpers;github.com/emersion/go-imap;github.com/emersion/go-imap-appendlimit;github.com/emersion/go-imap-idle;github.com/emersion/go-imap-move;github.com/emersion/go-imap-quota;github.com/emersion/go-imap-unselect;github.com/emersion/go-mbox;github.com/emersion/go-message;github.com/emersion/go-sasl;github.com/emersion/go-smtp;github.com/emersion/go-textwrapper;github.com/emersion/go-vcard;github.com/fatih/color;github.com/flynn-archive/go-shlex;github.com/getsentry/sentry-go;github.com/go-resty/resty/v2;github.com/golang/mock;github.com/google/go-cmp;github.com/google/uuid;github.com/gopherjs/gopherjs;github.com/hashicorp/go-multierror;github.com/jameskeane/bcrypt;github.com/jaytaylor/html2text;github.com/keybase/go-keychain;github.com/logrusorgru/aurora;github.com/mattn/go-runewidth;github.com/miekg/dns;github.com/nsf/jsondiff;github.com/olekukonko/tablewriter;github.com/pkg/errors;github.com/sirupsen/logrus;github.com/skratchdot/open-golang;github.com/ssor/bom;github.com/stretchr/testify;github.com/therecipe/qt;github.com/urfave/cli/v2;github.com/vmihailenco/msgpack/v5;go.etcd.io/bbolt;golang.org/x/crypto;golang.org/x/net;golang.org/x/text;;Font Awesome 4.7.0;;Qt 5.13 by Qt group;"

internal/bridge/store_factory.go

@@ -21,39 +21,42 @@ import (
 	"fmt"
 	"path/filepath"
 
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/store"
 	"github.com/ProtonMail/proton-bridge/internal/users"
-
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 )
 
 type storeFactory struct {
-	cache         Cacher
+	cache          Cacher
-	panicHandler  users.PanicHandler
+	sentryReporter *sentry.Reporter
-	clientManager users.ClientManager
+	panicHandler   users.PanicHandler
-	eventListener listener.Listener
+	clientManager  users.ClientManager
-	storeCache    *store.Cache
+	eventListener  listener.Listener
+	storeCache     *store.Cache
 }
 
 func newStoreFactory(
 	cache Cacher,
+	sentryReporter *sentry.Reporter,
 	panicHandler users.PanicHandler,
 	clientManager users.ClientManager,
 	eventListener listener.Listener,
 ) *storeFactory {
 	return &storeFactory{
-		cache:         cache,
+		cache:          cache,
-		panicHandler:  panicHandler,
+		sentryReporter: sentryReporter,
-		clientManager: clientManager,
+		panicHandler:   panicHandler,
-		eventListener: eventListener,
+		clientManager:  clientManager,
-		storeCache:    store.NewCache(cache.GetIMAPCachePath()),
+		eventListener:  eventListener,
+		storeCache:     store.NewCache(cache.GetIMAPCachePath()),
 	}
 }
 
 // New creates new store for given user.
 func (f *storeFactory) New(user store.BridgeUser) (*store.Store, error) {
 	storePath := getUserStorePath(f.cache.GetDBDir(), user.ID())
-	return store.New(f.panicHandler, user, f.clientManager, f.eventListener, storePath, f.storeCache)
+	return store.New(f.sentryReporter, f.panicHandler, user, f.clientManager, f.eventListener, storePath, f.storeCache)
 }
 
 // Remove removes all store files for given user.

internal/config/settings/kvs.go

@@ -21,6 +21,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"strconv"
 	"sync"
@@ -73,13 +74,12 @@ func (p *keyValueStore) save() error {
 	p.lock.Lock()
 	defer p.lock.Unlock()
 
-	f, err := os.Create(p.path)
+	b, err := json.MarshalIndent(p.cache, "", "\t")
 	if err != nil {
 		return err
 	}
-	defer f.Close() //nolint[errcheck]
 
-	return json.NewEncoder(f).Encode(p.cache)
+	return ioutil.WriteFile(p.path, b, 0600)
 }
 
 func (p *keyValueStore) setDefault(key, value string) {

internal/config/settings/kvs_test.go

@@ -72,20 +72,20 @@ func TestKeyValueStoreSetDefault(t *testing.T) {
 func TestKeyValueStoreSet(t *testing.T) {
 	pref := newTestEmptyKeyValueStore(t)
 	pref.Set("str", "value")
-	checkSavedKeyValueStore(t, "{\"str\":\"value\"}")
+	checkSavedKeyValueStore(t, "{\n\t\"str\": \"value\"\n}")
 }
 
 func TestKeyValueStoreSetInt(t *testing.T) {
 	pref := newTestEmptyKeyValueStore(t)
 	pref.SetInt("int", 42)
-	checkSavedKeyValueStore(t, "{\"int\":\"42\"}")
+	checkSavedKeyValueStore(t, "{\n\t\"int\": \"42\"\n}")
 }
 
 func TestKeyValueStoreSetBool(t *testing.T) {
 	pref := newTestEmptyKeyValueStore(t)
 	pref.SetBool("trueBool", true)
 	pref.SetBool("falseBool", false)
-	checkSavedKeyValueStore(t, "{\"falseBool\":\"false\",\"trueBool\":\"true\"}")
+	checkSavedKeyValueStore(t, "{\n\t\"falseBool\": \"false\",\n\t\"trueBool\": \"true\"\n}")
 }
 
 func newTestEmptyKeyValueStore(t *testing.T) *keyValueStore {
@@ -101,5 +101,5 @@ func newTestKeyValueStore(t *testing.T) *keyValueStore {
 func checkSavedKeyValueStore(t *testing.T, expected string) {
 	data, err := ioutil.ReadFile(testPrefFilePath)
 	require.NoError(t, err)
-	require.Equal(t, expected+"\n", string(data))
+	require.Equal(t, expected, string(data))
 }

internal/config/settings/settings.go

@@ -78,7 +78,7 @@ func (s *Settings) setDefaultValues() {
 	s.setDefault(ReportOutgoingNoEncKey, "false")
 	s.setDefault(LastVersionKey, "")
 	s.setDefault(UpdateChannelKey, "")
-	s.setDefault(RolloutKey, fmt.Sprintf("%v", rand.Float64()))
+	s.setDefault(RolloutKey, fmt.Sprintf("%v", rand.Float64())) //nolint[gosec] G404 It is OK to use weak random number generator here
 	s.setDefault(PreferredKeychainKey, "")
 
 	s.setDefault(APIPortKey, DefaultAPIPort)

internal/config/tls/tls.go

@@ -122,11 +122,7 @@ func (t *TLS) GenerateCerts(template *x509.Certificate) error {
 	}
 	defer keyOut.Close() // nolint[errcheck]
 
-	if err := pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
+	return pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
-		return err
-	}
-
-	return nil
 }
 
 // GetConfig tries to load TLS config or generate new one which is then returned.
@@ -148,6 +144,7 @@ func (t *TLS) GetConfig() (*tls.Config, error) {
 	caCertPool := x509.NewCertPool()
 	caCertPool.AddCert(c.Leaf)
 
+	// nolint[gosec]: We need to support older TLS versions for AppleMail and Outlook.
 	return &tls.Config{
 		Certificates: []tls.Certificate{c},
 		ServerName:   "127.0.0.1",

internal/config/useragent/platform.go

@@ -25,29 +25,27 @@ import (
 	"github.com/Masterminds/semver/v3"
 )
 
-// IsCatalinaOrNewer checks that host is MacOS Catalina 10.15.x or higher.
+// IsCatalinaOrNewer checks whether host is MacOS Catalina 10.15.x or higher.
 func IsCatalinaOrNewer() bool {
 	if runtime.GOOS != "darwin" {
 		return false
 	}
-	return isVersionCatalinaOrNewer(getMacVersion())
-}
 
-func getMacVersion() string {
+	rawVersion, err := exec.Command("sw_vers", "-productVersion").Output()
-	out, err := exec.Command("sw_vers", "-productVersion").Output()
-	if err != nil {
-		return ""
-	}
-
-	return strings.TrimSpace(string(out))
-}
-
-func isVersionCatalinaOrNewer(version string) bool {
-	v, err := semver.NewVersion(version)
 	if err != nil {
 		return false
 	}
 
-	catalina := semver.MustParse("10.15.0")
+	return isVersionCatalinaOrNewer(strings.TrimSpace(string(rawVersion)))
-	return v.GreaterThan(catalina) || v.Equal(catalina)
+}
+
+func isVersionCatalinaOrNewer(rawVersion string) bool {
+	semVersion, err := semver.NewVersion(rawVersion)
+	if err != nil {
+		return false
+	}
+
+	minVersion := semver.MustParse("10.15.0")
+
+	return semVersion.GreaterThan(minVersion) || semVersion.Equal(minVersion)
 }

internal/config/useragent/useragent.go

@@ -15,38 +15,45 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-package pmapi
+package useragent
 
 import (
 	"fmt"
+	"regexp"
 	"runtime"
-	"strings"
 )
 
-// removeBrackets handle unwanted brackets in client identification string and join with given joinBy parameter.
+type UserAgent struct {
-// Mac OS X Mail/13.0 (3601.0.4) -> Mac OS X Mail/13.0-3601.0.4 (joinBy = "-")
+	client, platform string
-func removeBrackets(s string, joinBy string) (r string) {
-	r = strings.ReplaceAll(s, " (", joinBy)
-	r = strings.ReplaceAll(r, "(", joinBy) // Should be faster than regex.
-	r = strings.ReplaceAll(r, ")", "")
-
-	return
 }
 
-func formatUserAgent(clientName, clientVersion, os string) string {
+func New() *UserAgent {
-	client := ""
+	return &UserAgent{
-	if clientName != "" {
+		client:   "",
-		client = removeBrackets(clientName, "-")
+		platform: runtime.GOOS,
-		if clientVersion != "" {
-			client += "/" + removeBrackets(clientVersion, "-")
-		}
 	}
-
+}
-	if os == "" {
+
-		os = runtime.GOOS
+func (ua *UserAgent) SetClient(name, version string) {
-	}
+	ua.client = fmt.Sprintf("%v/%v", name, regexp.MustCompile(`(.*) \((.*)\)`).ReplaceAllString(version, "$1-$2"))
-
+}
-	os = removeBrackets(os, " ")
+
-
+func (ua *UserAgent) HasClient() bool {
-	return fmt.Sprintf("%s (%s)", client, os)
+	return ua.client != ""
+}
+
+func (ua *UserAgent) SetPlatform(platform string) {
+	ua.platform = platform
+}
+
+func (ua *UserAgent) String() string {
+	var client string
+
+	if ua.client != "" {
+		client = ua.client
+	} else {
+		client = "NoClient/0.0.1"
+	}
+
+	return fmt.Sprintf("%v (%v)", client, ua.platform)
 }

internal/config/useragent/useragent_test.go

@@ -0,0 +1,86 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package useragent
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUserAgent(t *testing.T) {
+	tests := []struct {
+		name, version, platform string
+		want                    string
+	}{
+		// No name/version, no platform.
+		{
+			want: fmt.Sprintf("NoClient/0.0.1 (%v)", runtime.GOOS),
+		},
+
+		// No name/version, with platform.
+		{
+			platform: "macOS 10.15",
+			want:     "NoClient/0.0.1 (macOS 10.15)",
+		},
+
+		// With name/version, with platform.
+		{
+			name:     "Mac OS X Mail",
+			version:  "1.0.0",
+			platform: "macOS 10.15",
+			want:     "Mac OS X Mail/1.0.0 (macOS 10.15)",
+		},
+
+		// With name/version, with platform.
+		{
+			name:     "Mac OS X Mail",
+			version:  "13.4 (3608.120.23.2.4)",
+			platform: "macOS 10.15",
+			want:     "Mac OS X Mail/13.4-3608.120.23.2.4 (macOS 10.15)",
+		},
+
+		// With name/version, with platform.
+		{
+			name:     "Thunderbird",
+			version:  "78.6.1",
+			platform: "Windows 10 (10.0)",
+			want:     "Thunderbird/78.6.1 (Windows 10 (10.0))",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+
+		t.Run(test.want, func(t *testing.T) {
+			ua := New()
+
+			if test.name != "" && test.version != "" {
+				ua.SetClient(test.name, test.version)
+			}
+
+			if test.platform != "" {
+				ua.SetPlatform(test.platform)
+			}
+
+			assert.Equal(t, test.want, ua.String())
+		})
+	}
+}

internal/constants/update_default.go

@@ -15,18 +15,14 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-package imap
+// +build !build_qa
 
-import (
+package constants
-	"io"
+
-	"net/http"
+import "time"
-	"net/textproto"
+
+// nolint[gochecknoglobals]
+var (
+	// UpdateCheckInterval defines how often we check for new version
+	UpdateCheckInterval = time.Hour //nolint[gochecknoglobals]
 )
-
-func writeHeader(w io.Writer, h textproto.MIMEHeader) (err error) {
-	if err = http.Header(h).Write(w); err != nil {
-		return
-	}
-	_, err = io.WriteString(w, "\r\n")
-	return
-}

internal/constants/update_qa.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+// +build build_qa
+
+package constants
+
+import "time"
+
+// nolint[gochecknoglobals]
+var (
+	// UpdateCheckInterval defines how often we check for new version
+	UpdateCheckInterval = time.Duration(5 * time.Minute)
+)

internal/crash/handler.go

@@ -19,7 +19,7 @@
 package crash
 
 import (
-	"github.com/ProtonMail/proton-bridge/pkg/sentry"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/sirupsen/logrus"
 )
 

internal/frontend/autoconfig/applemail.go

@@ -93,7 +93,7 @@ func (c *appleMail) Configure(imapPort, smtpPort int, imapSSL, smtpSSL bool, use
 	})()
 
 	// Make sure the file is only readable for the current user.
-	f, err := os.OpenFile(filepath.Join(dir, "protonmail.mobileconfig"), os.O_RDWR|os.O_CREATE, 0600)
+	f, err := os.OpenFile(filepath.Clean(filepath.Join(dir, "protonmail.mobileconfig")), os.O_RDWR|os.O_CREATE, 0600)
 	if err != nil {
 		return err
 	}

internal/frontend/cli-ie/accounts.go

@@ -25,7 +25,7 @@ import (
 
 func (f *frontendCLI) listAccounts(c *ishell.Context) {
 	spacing := "%-2d: %-20s (%-15s, %-15s)\n"
-	f.Printf(bold(strings.Replace(spacing, "d", "s", -1)), "#", "account", "status", "address mode")
+	f.Printf(bold(strings.ReplaceAll(spacing, "d", "s")), "#", "account", "status", "address mode")
 	for idx, user := range f.ie.GetUsers() {
 		connected := "disconnected"
 		if user.IsConnected() {

internal/frontend/cli-ie/importexport.go

@@ -38,7 +38,7 @@ func (f *frontendCLI) importLocalMessages(c *ishell.Context) {
 		return
 	}
 
-	t, err := f.ie.GetLocalImporter(user.GetPrimaryAddress(), path)
+	t, err := f.ie.GetLocalImporter(user.Username(), user.GetPrimaryAddress(), path)
 	f.transfer(t, err, false, true)
 }
 
@@ -68,7 +68,7 @@ func (f *frontendCLI) importRemoteMessages(c *ishell.Context) {
 		return
 	}
 
-	t, err := f.ie.GetRemoteImporter(user.GetPrimaryAddress(), username, password, host, port)
+	t, err := f.ie.GetRemoteImporter(user.Username(), user.GetPrimaryAddress(), username, password, host, port)
 	f.transfer(t, err, false, true)
 }
 
@@ -81,7 +81,7 @@ func (f *frontendCLI) exportMessagesToEML(c *ishell.Context) {
 		return
 	}
 
-	t, err := f.ie.GetEMLExporter(user.GetPrimaryAddress(), path)
+	t, err := f.ie.GetEMLExporter(user.Username(), user.GetPrimaryAddress(), path)
 	f.transfer(t, err, true, false)
 }
 
@@ -94,7 +94,7 @@ func (f *frontendCLI) exportMessagesToMBOX(c *ishell.Context) {
 		return
 	}
 
-	t, err := f.ie.GetMBOXExporter(user.GetPrimaryAddress(), path)
+	t, err := f.ie.GetMBOXExporter(user.Username(), user.GetPrimaryAddress(), path)
 	f.transfer(t, err, true, false)
 }
 

internal/frontend/cli/accounts.go

@@ -28,7 +28,7 @@ import (
 
 func (f *frontendCLI) listAccounts(c *ishell.Context) {
 	spacing := "%-2d: %-20s (%-15s, %-15s)\n"
-	f.Printf(bold(strings.Replace(spacing, "d", "s", -1)), "#", "account", "status", "address mode")
+	f.Printf(bold(strings.ReplaceAll(spacing, "d", "s")), "#", "account", "status", "address mode")
 	for idx, user := range f.bridge.GetUsers() {
 		connected := "disconnected"
 		if user.IsConnected() {

internal/frontend/cli/frontend.go

@@ -102,10 +102,6 @@ func New( //nolint[funlen]
 		Aliases: []string{"p"},
 		Func:    fe.changePort,
 	})
-	changeCmd.AddCmd(&ishell.Cmd{Name: "proxy",
-		Help: "allow or disallow bridge to securely connect to proton via a third party when it is being blocked",
-		Func: fe.toggleAllowProxy,
-	})
 	changeCmd.AddCmd(&ishell.Cmd{Name: "smtp-security",
 		Help:    "change port numbers of IMAP and SMTP servers.(alias: ssl, starttls)",
 		Aliases: []string{"ssl", "starttls"},
@@ -113,13 +109,56 @@ func New( //nolint[funlen]
 	})
 	fe.AddCmd(changeCmd)
 
+	// DoH commands.
+	dohCmd := &ishell.Cmd{Name: "proxy",
+		Help: "allow or disallow bridge to securely connect to proton via a third party when it is being blocked",
+	}
+	dohCmd.AddCmd(&ishell.Cmd{Name: "allow",
+		Help: "allow bridge to securely connect to proton via a third party when it is being blocked",
+		Func: fe.allowProxy,
+	})
+	dohCmd.AddCmd(&ishell.Cmd{Name: "disallow",
+		Help: "disallow bridge to securely connect to proton via a third party when it is being blocked",
+		Func: fe.disallowProxy,
+	})
+	fe.AddCmd(dohCmd)
+
+	// Updates commands.
+	updatesCmd := &ishell.Cmd{Name: "updates",
+		Help: "manage bridge updates",
+	}
+	updatesCmd.AddCmd(&ishell.Cmd{Name: "check",
+		Help: "check for Bridge updates",
+		Func: fe.checkUpdates,
+	})
+	autoUpdatesCmd := &ishell.Cmd{Name: "autoupdates",
+		Help: "manage bridge updates",
+	}
+	updatesCmd.AddCmd(autoUpdatesCmd)
+	autoUpdatesCmd.AddCmd(&ishell.Cmd{Name: "enable",
+		Help: "automatically keep bridge up to date",
+		Func: fe.enableAutoUpdates,
+	})
+	autoUpdatesCmd.AddCmd(&ishell.Cmd{Name: "disable",
+		Help: "require bridge to be manually updated",
+		Func: fe.disableAutoUpdates,
+	})
+	updatesChannelCmd := &ishell.Cmd{Name: "channel",
+		Help: "switch updates channel",
+	}
+	updatesCmd.AddCmd(updatesChannelCmd)
+	updatesChannelCmd.AddCmd(&ishell.Cmd{Name: "early",
+		Help: "switch to the early-access updates channel",
+		Func: fe.selectEarlyChannel,
+	})
+	updatesChannelCmd.AddCmd(&ishell.Cmd{Name: "stable",
+		Help: "switch to the stable updates channel",
+		Func: fe.selectStableChannel,
+	})
+	fe.AddCmd(updatesCmd)
+
 	// Check commands.
 	checkCmd := &ishell.Cmd{Name: "check", Help: "check internet connection or new version."}
-	checkCmd.AddCmd(&ishell.Cmd{Name: "updates",
-		Help:    "check for Bridge updates. (aliases: u, v, version)",
-		Aliases: []string{"u", "version", "v"},
-		Func:    fe.checkUpdates,
-	})
 	checkCmd.AddCmd(&ishell.Cmd{Name: "internet",
 		Help:    "check internet connection. (aliases: i, conn, connection)",
 		Aliases: []string{"i", "con", "connection"},

internal/frontend/cli/system.go

@@ -132,24 +132,36 @@ func (f *frontendCLI) changePort(c *ishell.Context) {
 	}
 }
 
-func (f *frontendCLI) toggleAllowProxy(c *ishell.Context) {
+func (f *frontendCLI) allowProxy(c *ishell.Context) {
 	if f.settings.GetBool(settings.AllowProxyKey) {
-		f.Println("Bridge is currently set to use alternative routing to connect to Proton if it is being blocked.")
+		f.Println("Bridge is already set to use alternative routing to connect to Proton if it is being blocked.")
-		if f.yesNoQuestion("Are you sure you want to stop bridge from doing this") {
+		return
-			f.settings.SetBool(settings.AllowProxyKey, false)
+	}
-			f.bridge.DisallowProxy()
+
-		}
+	f.Println("Bridge is currently set to NOT use alternative routing to connect to Proton if it is being blocked.")
-	} else {
+
-		f.Println("Bridge is currently set to NOT use alternative routing to connect to Proton if it is being blocked.")
+	if f.yesNoQuestion("Are you sure you want to allow bridge to do this") {
-		if f.yesNoQuestion("Are you sure you want to allow bridge to do this") {
+		f.settings.SetBool(settings.AllowProxyKey, true)
-			f.settings.SetBool(settings.AllowProxyKey, true)
+		f.bridge.AllowProxy()
-			f.bridge.AllowProxy()
+	}
-		}
+}
+
+func (f *frontendCLI) disallowProxy(c *ishell.Context) {
+	if !f.settings.GetBool(settings.AllowProxyKey) {
+		f.Println("Bridge is already set to NOT use alternative routing to connect to Proton if it is being blocked.")
+		return
+	}
+
+	f.Println("Bridge is currently set to use alternative routing to connect to Proton if it is being blocked.")
+
+	if f.yesNoQuestion("Are you sure you want to stop bridge from doing this") {
+		f.settings.SetBool(settings.AllowProxyKey, false)
+		f.bridge.DisallowProxy()
 	}
 }
 
 func (f *frontendCLI) isPortFree(port string) bool {
-	port = strings.Replace(port, ":", "", -1)
+	port = strings.ReplaceAll(port, ":", "")
 	if port == "" || port == currentPort {
 		return true
 	}

internal/frontend/cli/updates.go

@@ -21,11 +21,23 @@ import (
 	"strings"
 
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/abiosoft/ishell"
 )
 
 func (f *frontendCLI) checkUpdates(c *ishell.Context) {
-	f.Println("Your version is up to date.")
+	version, err := f.updater.Check()
+	if err != nil {
+		f.Println("An error occurred while checking for updates.")
+		return
+	}
+
+	if f.updater.IsUpdateApplicable(version) {
+		f.Println("An update is available.")
+	} else {
+		f.Println("Your version is up to date.")
+	}
 }
 
 func (f *frontendCLI) printCredits(c *ishell.Context) {
@@ -33,3 +45,68 @@ func (f *frontendCLI) printCredits(c *ishell.Context) {
 		f.Println(pkg)
 	}
 }
+
+func (f *frontendCLI) enableAutoUpdates(c *ishell.Context) {
+	if f.settings.GetBool(settings.AutoUpdateKey) {
+		f.Println("Bridge is already set to automatically install updates.")
+		return
+	}
+
+	f.Println("Bridge is currently set to NOT automatically install updates.")
+
+	if f.yesNoQuestion("Are you sure you want to allow bridge to do this") {
+		f.settings.SetBool(settings.AutoUpdateKey, true)
+	}
+}
+
+func (f *frontendCLI) disableAutoUpdates(c *ishell.Context) {
+	if !f.settings.GetBool(settings.AutoUpdateKey) {
+		f.Println("Bridge is already set to NOT automatically install updates.")
+		return
+	}
+
+	f.Println("Bridge is currently set to automatically install updates.")
+
+	if f.yesNoQuestion("Are you sure you want to stop bridge from doing this") {
+		f.settings.SetBool(settings.AutoUpdateKey, false)
+	}
+}
+
+func (f *frontendCLI) selectEarlyChannel(c *ishell.Context) {
+	if f.bridge.GetUpdateChannel() == updater.EarlyChannel {
+		f.Println("Bridge is already on the early-access update channel.")
+		return
+	}
+
+	f.Println("Bridge is currently on the stable update channel.")
+
+	if f.yesNoQuestion("Are you sure you want to switch to the early-access update channel") {
+		needRestart, err := f.bridge.SetUpdateChannel(updater.EarlyChannel)
+		if err != nil {
+			f.Println("There was a problem switching update channel.")
+		}
+		if needRestart {
+			f.restarter.SetToRestart()
+		}
+	}
+}
+
+func (f *frontendCLI) selectStableChannel(c *ishell.Context) {
+	if f.bridge.GetUpdateChannel() == updater.StableChannel {
+		f.Println("Bridge is already on the stable update channel.")
+		return
+	}
+
+	f.Println("Bridge is currently on the early-access update channel.")
+	f.Println("Switching to the stable channel may reset all data!")
+
+	if f.yesNoQuestion("Are you sure you want to switch to the stable update channel") {
+		needRestart, err := f.bridge.SetUpdateChannel(updater.StableChannel)
+		if err != nil {
+			f.Println("There was a problem switching update channel.")
+		}
+		if needRestart {
+			f.restarter.SetToRestart()
+		}
+	}
+}

internal/frontend/frontend.go

@@ -22,6 +22,7 @@ import (
 	"github.com/ProtonMail/go-autostart"
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/cli"
 	cliie "github.com/ProtonMail/proton-bridge/internal/frontend/cli-ie"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/qt"
@@ -60,6 +61,7 @@ func New(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge *bridge.Bridge,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,
@@ -77,6 +79,7 @@ func New(
 		settings,
 		eventListener,
 		updater,
+		userAgent,
 		bridgeWrap,
 		noEncConfirmator,
 		autostart,
@@ -95,6 +98,7 @@ func newBridgeFrontend(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge types.Bridger,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,
@@ -122,6 +126,7 @@ func newBridgeFrontend(
 			settings,
 			eventListener,
 			updater,
+			userAgent,
 			bridge,
 			noEncConfirmator,
 			autostart,

internal/frontend/qml/BridgeUI/DialogKeychainChange.qml

@@ -0,0 +1,194 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+// Change default keychain dialog
+
+import QtQuick 2.8
+import BridgeUI 1.0
+import ProtonUI 1.0
+import QtQuick.Controls 2.2 as QC
+import QtQuick.Layouts 1.0
+
+Dialog {
+    id: root
+
+    title : "Change which keychain Bridge uses as default"
+    subtitle : "Select which keychain is used (Bridge will automatically restart)"
+    isDialogBusy: currentIndex==1
+
+    property var selectedKeychain
+
+    Connections {
+        target: go.selectedKeychain
+        onValueChanged: {
+            console.debug("go.selectedKeychain == ", go.selectedKeychain)
+        }
+    }
+
+    ColumnLayout {
+        Layout.fillHeight: true
+        Layout.fillWidth: true
+
+        Item {
+            Layout.fillWidth: true
+            Layout.minimumHeight: root.titleHeight + Style.dialog.heightSeparator
+            Layout.maximumHeight: root.titleHeight + Style.dialog.heightSeparator
+        }
+
+        Item {
+            Layout.fillHeight: true
+            Layout.fillWidth: true
+
+            ColumnLayout {
+                anchors.centerIn: parent
+
+                Repeater {
+                    id: keychainRadioButtons
+                    model: go.availableKeychain
+                    QC.RadioButton {
+                        id: radioDelegate
+                        text: modelData
+                        checked: go.selectedKeychain === modelData
+
+                        Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
+                        spacing: Style.main.spacing
+
+                        indicator: Text {
+                            text  : radioDelegate.checked ? Style.fa.check_circle : Style.fa.circle_o
+                            color : radioDelegate.checked ? Style.main.textBlue   : Style.main.textInactive
+                            font {
+                                pointSize: Style.dialog.iconSize * Style.pt
+                                family: Style.fontawesome.name
+                            }
+                        }
+                        contentItem: Text {
+                            text: radioDelegate.text
+                            color: Style.main.text
+                            font {
+                                pointSize: Style.dialog.fontSize * Style.pt
+                                bold: checked
+                            }
+                            horizontalAlignment : Text.AlignHCenter
+                            verticalAlignment   : Text.AlignVCenter
+                            leftPadding: Style.dialog.iconSize
+                        }
+
+                        onCheckedChanged: {
+                            if (checked) {
+                                root.selectedKeychain = modelData
+                            }
+                        }
+                    }
+                }
+
+                Item {
+                    Layout.fillWidth: true
+                    Layout.minimumHeight: Style.dialog.heightSeparator
+                    Layout.maximumHeight: Style.dialog.heightSeparator
+                }
+
+                Row {
+                    id: buttonRow
+                    Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
+                    spacing: Style.dialog.spacing
+                    ButtonRounded {
+                        id:buttonNo
+                        color_main: Style.dialog.text
+                        fa_icon: Style.fa.times
+                        text: qsTr("Cancel", "dismisses current action")
+                        onClicked : root.hide()
+                    }
+                    ButtonRounded {
+                        id: buttonYes
+                        color_main: Style.dialog.text
+                        color_minor: Style.main.textBlue
+                        isOpaque: true
+                        fa_icon: Style.fa.check
+                        text: qsTr("Okay", "confirms and dismisses a notification")
+                        onClicked : root.confirmed()
+                    }
+                }
+            }
+        }
+    }
+
+    ColumnLayout {
+        Layout.fillHeight: true
+        Layout.fillWidth: true
+
+        Item {
+            Layout.fillWidth: true
+            Layout.minimumHeight: root.titleHeight + Style.dialog.heightSeparator
+            Layout.maximumHeight: root.titleHeight + Style.dialog.heightSeparator
+        }
+
+        Item {
+            Layout.fillHeight: true
+            Layout.fillWidth: true
+            Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
+
+            Text {
+                id: answ
+                anchors.horizontalCenter: parent.horizontalCenter
+                anchors.verticalCenter: parent.verticalCenter
+                width : parent.width/2
+                color: Style.dialog.text
+                font {
+                    pointSize : Style.dialog.fontSize * Style.pt
+                    bold      : true
+                }
+                text : "Default keychain is now set to " + root.selectedKeychain +
+                "\n\n" +
+                qsTr("Settings will be applied after the next start.", "notification about setting being applied after next start") +
+                "\n\n" +
+                qsTr("Bridge will now restart.", "notification about restarting")
+                wrapMode: Text.Wrap
+                horizontalAlignment: Text.AlignHCenter
+            }
+        }
+    }
+
+    Shortcut {
+        sequence: StandardKey.Cancel
+        onActivated: root.hide()
+    }
+
+    Shortcut {
+        sequence: "Enter"
+        onActivated: root.confirmed()
+    }
+
+    function confirmed() {
+        if (selectedKeychain === go.selectedKeychain) {
+            root.hide()
+            return
+        }
+
+        incrementCurrentIndex()
+        timer.start()
+    }
+
+    timer.interval : 5000
+
+    Connections {
+        target: timer
+        onTriggered: {
+            // This action triggers restart on the backend side.
+            go.selectedKeychain = selectedKeychain
+        }
+    }
+}

internal/frontend/qml/BridgeUI/DialogYesNo.qml

@@ -229,7 +229,7 @@ Dialog {
                 currentIndex : 0
                 title        : qsTr("Clear cache", "title of page that displays during cache clearing")
                 question     : qsTr("Are you sure you want to clear your local cache?", "displays during cache clearing")
-                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, temporarily slowing down the email download process significantly.", "displays during cache clearing")
+                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, and requires you to reconfigure your client.", "displays during cache clearing")
                 answer       : qsTr("Clearing the cache ...", "displays during cache clearing")
             }
         },
@@ -310,7 +310,7 @@ Dialog {
                 target: root
                 currentIndex : 0
                 question     : qsTr("Are you sure you want to leave early access? Please keep in mind this operation clears the cache and restarts Bridge.")
-                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, temporarily slowing down the email download process significantly.")
+                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, and requires you to reconfigure your client.")
                 title        : qsTr("Disable early access")
                 answer       : qsTr("Disabling early access...")
             }

internal/frontend/qml/BridgeUI/MainWindow.qml

@@ -303,6 +303,10 @@ Window {
         id: dialogChangePort
     }
 
+    DialogKeychainChange {
+        id: dialogChangeKeychain
+    }
+
     DialogConnectionTroubleshoot {
         id: dialogConnectionTroubleshoot
     }

internal/frontend/qml/BridgeUI/SettingsView.qml

@@ -239,6 +239,25 @@ Item {
                     dialogGlobal.show()
                 }
             }
+
+            ButtonIconText {
+                id: changeKeychain
+                visible: advancedSettings.isAdvanced && (go.availableKeychain.length > 1)
+                text: qsTr("Change keychain", "button to open dialog with default keychain selection")
+                leftIcon.text  : Style.fa.key
+                rightIcon {
+                    text : qsTr("Change", "clickable link next to change keychain button in settings")
+                    color: Style.main.text
+                    font {
+                        family : changeKeychain.font.family // use default font, not font-awesome
+                        pointSize : Style.settings.fontSize * Style.pt
+                        underline : true
+                    }
+                }
+                onClicked: {
+                    dialogChangeKeychain.show()
+                }
+            }
         }
     }
 }

internal/frontend/qml/BridgeUI/qmldir

@@ -2,6 +2,7 @@ module BridgeUI
 AccountDelegate    1.0 AccountDelegate.qml
 Credits            1.0 Credits.qml
 DialogFirstStart   1.0 DialogFirstStart.qml
+DialogKeychainChange 1.0 DialogKeychainChange.qml
 DialogPortChange   1.0 DialogPortChange.qml
 DialogYesNo        1.0 DialogYesNo.qml
 DialogTLSCertInfo  1.0 DialogTLSCertInfo.qml

internal/frontend/qml/Gui.qml

@@ -107,17 +107,53 @@ Item {
             gui.openMainWindow(false)
             if (go.isConnectionOK) {
                 if( winMain.updateState=="noInternet") {
-                    go.setUpdateState("upToDate")
+                    go.updateState = "upToDate"
                 }
             } else {
-                go.setUpdateState("noInternet")
+                go.updateState = "noInternet"
             }
         }
 
-        onSetUpdateState : {
+        onUpdateStateChanged : {
+            // Update tray icon if needed
+            switch (go.updateState) {
+                case "internetCheck":
+                    break;
+                case "noInternet" :
+                    gui.warningFlags |= Style.warnInfoBar
+                    break;
+                case "oldVersion":
+                    gui.warningFlags |= Style.warnInfoBar
+                    break;
+                case "forceUpdate":
+                    // Force update should presist once it happened and never be overwritten.
+                    // That means that tray icon should allways remain in error state.
+                    // But since we have only two sources of error icon in tray (force update 
+                    // + installation fail) and both are unrecoverable and we do not ever remove
+                    // error flag from gui.warningFlags - it is ok to rely on gui.warningFlags and
+                    // not on winMain.updateState (which presist forceUpdate)
+                    gui.warningFlags |= Style.errorInfoBar
+                    break;
+                case "upToDate":
+                    gui.warningFlags &= ~Style.warnInfoBar
+                    break;
+                case "updateRestart":
+                    gui.warningFlags |= Style.warnInfoBar
+                    break;
+                case "updateError":
+                    gui.warningFlags |= Style.errorInfoBar
+                    break;
+                default :
+                    break;
+            }
+
+            // if main window is closed - most probably it is destroyed (see closeMainWindow())
+            if (winMain == null) {
+                return
+            }
             // once app is outdated prevent from state change
             if (winMain.updateState != "forceUpdate") {
-                winMain.updateState = updateState
+                winMain.updateState = go.updateState
             }
         }
 
@@ -129,15 +165,14 @@ Item {
         }
 
         onNotifyManualUpdate: {
-            go.setUpdateState("oldVersion")
+            go.updateState = "oldVersion"
         }
 
         onNotifyManualUpdateRestartNeeded: {
             if (!winMain.dialogUpdate.visible) {
-                gui.openMainWindow(true)
                 winMain.dialogUpdate.show()
             }
-            go.setUpdateState("updateRestart")
+            go.updateState = "updateRestart"
             winMain.dialogUpdate.finished(false)
 
             // after manual update - just retart immidiatly
@@ -147,28 +182,25 @@ Item {
 
         onNotifyManualUpdateError: {
             if (!winMain.dialogUpdate.visible) {
-                gui.openMainWindow(true)
                 winMain.dialogUpdate.show()
             }
-            go.setUpdateState("updateError")
+            go.updateState = "updateError"
             winMain.dialogUpdate.finished(true)
         }
 
         onNotifyForceUpdate : {
-            go.setUpdateState("forceUpdate")
+            go.updateState = "forceUpdate"
             if (!winMain.dialogUpdate.visible) {
-                gui.openMainWindow(true)
                 winMain.dialogUpdate.show()
             }
         }
 
         onNotifySilentUpdateRestartNeeded: {
-            go.setUpdateState("updateRestart")
+            go.updateState = "updateRestart"
         }
 
         onNotifySilentUpdateError: {
-            go.setUpdateState("updateError")
+            go.updateState = "updateError"
-            gui.openMainWindow(true)
         }
 
         onNotifyLogout : {
@@ -287,9 +319,17 @@ Item {
         if (showAndRise) {
             gui.winMain.showAndRise()
         }
+
+        // restore update notification bar: trigger updateStateChanged
+        var tmp = go.updateState
+        go.updateState = ""
+        go.updateState = tmp
     }
 
     function closeMainWindow () {
+        // Historical reasons: once upon a time there was a report about high GPU
+        // usage on MacOS while bridge is closed. Legends say that destroying 
+        // MainWindow solved this.
         gui.winMain.hide()
         gui.winMain.destroy(5000)
         gui.winMain = null

internal/frontend/qml/GuiIE.qml

@@ -30,7 +30,6 @@ Item {
     id: gui
     property alias winMain: winMain
     property bool isFirstWindow: true
-    property int warningFlags: 0
 
     property var locale    : Qt.locale("en_US")
     property date netBday  : new Date("1989-03-13T00:00:00")
@@ -96,17 +95,17 @@ Item {
             go.isConnectionOK = isAvailable
             if (go.isConnectionOK) {
                 if( winMain.updateState==gui.enums.statusNoInternet) {
-                    go.setUpdateState(gui.enums.statusUpToDate)
+                    go.updateState = gui.enums.statusUpToDate
                 }
             } else {
-                go.setUpdateState(gui.enums.statusNoInternet)
+                go.updateState = gui.enums.statusNoInternet
             }
         }
 
-        onSetUpdateState : {
+        onUpdateStateChanged : {
             // once app is outdated prevent from state change
             if (winMain.updateState != "forceUpdate") {
-                winMain.updateState = updateState
+                winMain.updateState = go.updateState
             }
         }
 
@@ -207,16 +206,16 @@ Item {
         }
 
         onNotifyManualUpdate: {
-            go.setUpdateState("oldVersion")
+            go.updateState = "oldVersion"
         }
 
         onNotifyManualUpdateRestartNeeded: {
             if (!winMain.dialogUpdate.visible) {
                 winMain.dialogUpdate.show()
             }
-            go.setUpdateState("updateRestart")
+            go.updateState = "updateRestart"
             winMain.dialogUpdate.finished(false)
-
+        
             // after manual update - just retart immidiatly
             go.setToRestart()
             Qt.quit()
@@ -226,24 +225,24 @@ Item {
             if (!winMain.dialogUpdate.visible) {
                 winMain.dialogUpdate.show()
             }
-            go.setUpdateState("updateError")
+            go.updateState = "updateError"
             winMain.dialogUpdate.finished(true)
         }
 
         onNotifyForceUpdate : {
-            go.setUpdateState("forceUpdate")
+            go.updateState = "forceUpdate"
             if (!winMain.dialogUpdate.visible) {
                 winMain.dialogUpdate.show()
             }
         }
 
-        onNotifySilentUpdateRestartNeeded: {
+        //onNotifySilentUpdateRestartNeeded: {
-            go.setUpdateState("updateRestart")
+        //    go.updateState = "updateRestart"
-        }
+        //}
-
+        //
-        onNotifySilentUpdateError: {
+        //onNotifySilentUpdateError: {
-            go.setUpdateState("updateError")
+        //    go.updateState = "updateError"
-        }
+        //}
 
         onNotifyLogout : {
             go.notifyBubble(0, qsTr("Account %1 has been disconnected. Please log in to continue to use the Import-Export app with this account.").arg(accname) )

internal/frontend/qml/ImportExportUI/AccountDelegate.qml

@@ -165,6 +165,7 @@ Column {
             textColor : Style.main.textBlue
             onClicked: {
                 dialogExport.currentIndex = 0
+                dialogExport.account = account
                 dialogExport.address = account
                 dialogExport.show()
             }
@@ -321,6 +322,7 @@ Column {
                         textBold: true
                         textColor: Style.main.textBlue
                         onClicked: {
+                            dialogExport.account = account
                             dialogExport.address = listalias[index]
                             dialogExport.show()
                         }
@@ -339,6 +341,7 @@ Column {
                         textBold: true
                         textColor: enabled ? Style.main.textBlue : Style.main.textDisabled
                         onClicked: {
+                            dialogImport.account = account
                             dialogImport.address = listalias[index]
                             dialogImport.show()
                         }

internal/frontend/qml/ImportExportUI/DialogExport.qml

@@ -35,6 +35,7 @@ Dialog {
 
     title : set_title()
 
+    property string account
     property string address
     property alias finish: finish
 
@@ -428,7 +429,7 @@ Dialog {
         onTriggered : {
             switch (currentIndex) {
                 case 0:
-                go.loadStructureForExport(root.address)
+                go.loadStructureForExport(root.account, root.address)
                 sourceFoldersInput.hasItems = (transferRules.rowCount() > 0)
                 break
                 case 2:

internal/frontend/qml/ImportExportUI/DialogImport.qml

@@ -34,6 +34,7 @@ Dialog {
 
     isDialogBusy: currentIndex==3 || currentIndex==4
 
+    property string account
     property string address
     property string inputPath  : ""
     property bool   isFromFile : inputEmail.text == "" && root.inputPath != ""
@@ -1032,6 +1033,7 @@ Dialog {
                     root.isFromIMAP,
                     root.inputPath,
                     inputEmail.text, inputPassword.text, inputServer.text, inputPort.text,
+                    root.account,
                     root.address
                 )
                 break

internal/frontend/qml/ImportExportUI/SettingsView.qml

@@ -96,6 +96,8 @@ Item {
                 onClicked: bugreportWin.show()
             }
 
+            /*
+
             ButtonIconText {
                 id: autoUpdates
                 text: qsTr("Keep the application up to date", "label for toggle that activates and disables the automatic updates")
@@ -115,8 +117,6 @@ Item {
                 }
             }
 
-            /*
-
              ButtonIconText {
                  id: cacheClear
                  text: qsTr("Clear Cache")

internal/frontend/qml/ProtonUI/Dialog.qml

@@ -18,6 +18,7 @@
 // Dialog with adding new user
 
 import QtQuick 2.8
+import QtQuick.Controls 2.1
 import QtQuick.Layouts 1.3
 import ProtonUI 1.0
 
@@ -83,6 +84,9 @@ StackLayout {
             text : ""
             color: Style.main.textBlue
             visible: false
+            width: root.width
+            horizontalAlignment: Text.AlignHCenter
+            wrapMode: Text.WordWrap
         }
 
         // prevent any action below
@@ -111,6 +115,11 @@ StackLayout {
     Accessible.description: title
     Accessible.focusable: true
 
+    onVisibleChanged: {
+        if (background.visible != visible) {
+            background.visible = visible
+        }
+    }
 
     visible      : false
     anchors {

internal/frontend/qml/ProtonUI/DialogAddUser.qml

@@ -70,7 +70,8 @@ Dialog {
             id: topSep
             color  : "transparent"
             width  : Style.main.dummy
-            height : root.height/2 - (dialogNameAndPassword.heightInputs)/2
+            // Hacky hack: +10 is to make title of Dialog bigger so longer error can fit just fine.
+            height : root.height/2 + 10 - (dialogNameAndPassword.heightInputs)/2
         }
 
         InputField {

internal/frontend/qml/ProtonUI/DialogUpdate.qml

@@ -107,7 +107,7 @@ Dialog {
                 text: qsTr("Automatically update in the future", "Checkbox label for using autoupdates later on")
                 checked: go.isAutoUpdate
                 onToggled: go.toggleAutoUpdate()
-                visible: !root.forceUpdate
+                visible: !root.forceUpdate && (go.isAutoUpdate != undefined)
             }
 
             Row {

internal/frontend/qml/ProtonUI/InformationBar.qml

@@ -66,14 +66,15 @@ Rectangle {
         ClickIconText {
             id: linkText
             anchors.verticalCenter : message.verticalCenter
-            iconText  : ""
+            iconText  : " "
             fontSize : root.fontSize
+            textUnderline: true
         }
 
         ClickIconText {
             id: actionText
             anchors.verticalCenter : message.verticalCenter
-            iconText  : ""
+            iconText  : " "
             fontSize : root.fontSize
             textUnderline: true
         }
@@ -107,31 +108,25 @@ Rectangle {
     onStateChanged : {
         switch (root.state) {
             case "internetCheck":
-            break;
+                break;
             case "noInternet" :
-            gui.warningFlags |= Style.warnInfoBar
+                retryInternet.start()
-            retryInternet.start()
+                secLeft=checkInterval[iTry]
-            secLeft=checkInterval[iTry]
+                break;
-            break;
             case "oldVersion":
-            gui.warningFlags |= Style.warnInfoBar
+                break;
-            break;
             case "forceUpdate":
-            gui.warningFlags |= Style.errorInfoBar
+                break;
-            break;
             case "upToDate":
-            gui.warningFlags &= ~Style.warnInfoBar
+                iTry = 0
-            iTry = 0
+                secLeft=checkInterval[iTry]
-            secLeft=checkInterval[iTry]
+                break;
-            break;
             case "updateRestart":
-            gui.warningFlags |= Style.warnInfoBar
+                break;
-            break;
             case "updateError":
-            gui.warningFlags |= Style.errorInfoBar
+                break;
-            break;
             default :
-            break;
+                break;
         }
 
         if (root.state!="noInternet") {
@@ -247,7 +242,7 @@ Rectangle {
             PropertyChanges {
                 target: linkText
                 visible: true
-                text: "(" + qsTr("view release notes", "display the release notes from the new version") + ")"
+                text: qsTr("Release Notes", "display the release notes from the new version")
                 onClicked: gui.openReleaseNotes()
             }
             PropertyChanges {
@@ -270,7 +265,7 @@ Rectangle {
                 target: closeSign
                 visible: true
                 onClicked: {
-                    root.state = "upToDate"
+                    go.updateState = "upToDate"
                 }
             }
         },

internal/frontend/qml/tst_Gui.qml

@@ -24,7 +24,7 @@ import QtQuick.Window 2.2
 
 Window {
     id: testroot
-    width   : 150
+    width   : 250
     height  : 600
     flags   : Qt.Window | Qt.Dialog | Qt.FramelessWindowHint
     visible : true
@@ -60,7 +60,7 @@ Window {
         Text {
             id: systrText
             anchors {
-                right : test_systray.right
+                horizontalCenter: parent.horizontalCenter
                 verticalCenter: test_systray.verticalCenter
             }
             text: "unset"
@@ -281,6 +281,9 @@ Window {
 
         property bool hasNoKeychain : true
 
+        property var availableKeychain: ["pass-app", "gnome-keyring"]
+        property var selectedKeychain: "gnome-keyring"
+
         property string wrongCredentials
         property string wrongMailboxPassword
         property string canNotReachAPI
@@ -296,6 +299,7 @@ Window {
         property string fullversion : "QA.1.0 (d9f8sdf9) 2020-02-19T10:57:23+01:00"
         property string downloadLink: "https://protonmail.com/download/beta/protonmail-bridge-1.1.5-1.x86_64.rpm;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;"
 
+        property string updateState
         property string updateVersion : "QA.1.0"
         property bool updateCanInstall: true
         property string updateLandingPage : "https://protonmail.com/bridge/download/"
@@ -337,7 +341,6 @@ Window {
 
         signal notifyPortIssue(bool busyPortIMAP, bool busyPortSMTP)
         signal notifyVersionIsTheLatest()
-        signal setUpdateState(string updateState)
         signal notifyKeychainRebuild()
         signal notifyHasNoKeychain()
 

internal/frontend/qml/tst_GuiIE.qml

@@ -23,13 +23,13 @@ import QtQuick.Window 2.2
 
 Window {
     id      : testroot
-    width   : 100
+    width   : 150
     height  : 600
     flags   : Qt.Window | Qt.Dialog | Qt.FramelessWindowHint
     visible : true
     title   : "GUI test Window"
     color   : "transparent"
-    x       : testgui.winMain.x - 120
+    x       : testgui.winMain.x - 170
     y       : testgui.winMain.y
 
     property bool newVersion : true
@@ -110,8 +110,8 @@ Window {
         ListElement { title: "NotifyManualUpdateRestart" }
         ListElement { title: "NotifyManualUpdateError" }
         ListElement { title: "ForceUpdate" }
-        ListElement { title: "NotifySilentUpdateRestartNeeded" }
+        //ListElement { title: "NotifySilentUpdateRestartNeeded" }
-        ListElement { title: "NotifySilentUpdateError" }
+        //ListElement { title: "NotifySilentUpdateError" }
         ListElement { title : "ImportStructure"     }
         ListElement { title : "DraftImpFailed"      }
         ListElement { title : "NoInterImp"          }
@@ -183,12 +183,12 @@ Window {
                     case "ForceUpdate" :
                     go.notifyForceUpdate()
                     break;
-                    case "NotifySilentUpdateRestartNeeded" :
+                    //case "NotifySilentUpdateRestartNeeded" :
-                    go.notifySilentUpdateRestartNeeded()
+                    //go.notifySilentUpdateRestartNeeded()
-                    break;
+                    //break;
-                    case "NotifySilentUpdateError" :
+                    //case "NotifySilentUpdateError" :
-                    go.notifySilentUpdateError()
+                    //go.notifySilentUpdateError()
-                    break;
+                    //break;
                     case "ImportStructure" :
                     testgui.winMain.dialogImport.address = "cuto@pm.com"
                     testgui.winMain.dialogImport.show()
@@ -836,7 +836,7 @@ Window {
         id: go
 
         property int isAutoStart : 1
-        property bool isAutoUpdate : false
+        //property bool isAutoUpdate : false
         property bool isFirstStart : false
         property string currentAddress : "none"
         //property string goos : "windows"
@@ -856,16 +856,17 @@ Window {
         property string fullversion : "QA.1.0 (d9f8sdf9) 2020-02-19T10:57:23+01:00"
         property string downloadLink: "https://protonmail.com/download/beta/protonmail-bridge-1.1.5-1.x86_64.rpm;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;"
 
+        property string updateState
         property string updateVersion : "q0.1.0"
-        property bool updateCanInstall: true
+        property bool updateCanInstall: false
         property string updateLandingPage : "https://protonmail.com/import-export/download/"
         property string updateReleaseNotesLink  : "https://protonmail.com/download/ie/release_notes.html"
         signal notifyManualUpdate()
         signal notifyManualUpdateRestartNeeded()
         signal notifyManualUpdateError()
         signal notifyForceUpdate()
-        signal notifySilentUpdateRestartNeeded()
+        //signal notifySilentUpdateRestartNeeded()
-        signal notifySilentUpdateError()
+        //signal notifySilentUpdateError()
         function checkForUpdates() {
             console.log("checkForUpdates")
             go.notifyVersionIsTheLatest()
@@ -900,7 +901,6 @@ Window {
         signal showQuit()
 
         signal notifyVersionIsTheLatest()
-        signal setUpdateState(string updateState)
 
         signal showMainWin()
         signal hideMainWin()
@@ -1355,10 +1355,10 @@ Window {
             return !fname.includes("fail")
         }
 
-        onToggleAutoUpdate: {
+        //onToggleAutoUpdate: {
-            workAndClose()
+        //    workAndClose()
-            isAutoUpdate = (isAutoUpdate!=false) ? false : true
+        //    isAutoUpdate = (isAutoUpdate!=false) ? false : true
-            console.log (" Test: onToggleAutoUpdate "+isAutoUpdate)
+        //    console.log (" Test: onToggleAutoUpdate "+isAutoUpdate)
-        }
+        //}
     }
 }

internal/frontend/qt-common/account_model.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtcommon
 

internal/frontend/qt-common/accounts.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtcommon
 

internal/frontend/qt-common/common.cpp

@@ -1,4 +1,4 @@
-// +build !nogui
+// +build build_qt
 
 #include "common.h"
 #include "_cgo_export.h"

internal/frontend/qt-common/common.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtcommon
 

internal/frontend/qt-common/notification.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtcommon
 

internal/frontend/qt-ie/enums.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/error_list.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/export.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 
@@ -29,7 +29,7 @@ const (
 	TypeMBOX = "MBOX"
 )
 
-func (f *FrontendQt) LoadStructureForExport(addressOrID string) {
+func (f *FrontendQt) LoadStructureForExport(username, addressOrID string) {
 	errCode := errUnknownError
 	var err error
 	defer func() {
@@ -41,7 +41,7 @@ func (f *FrontendQt) LoadStructureForExport(addressOrID string) {
 		}
 	}()
 
-	if f.transfer, err = f.ie.GetEMLExporter(addressOrID, ""); err != nil {
+	if f.transfer, err = f.ie.GetEMLExporter(username, addressOrID, ""); err != nil {
 		// The only error can be problem to load PM user and address.
 		errCode = errPMLoadFailed
 		return

internal/frontend/qt-ie/folder_functions.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/folder_structure.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/folder_structure_test.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/frontend.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 
@@ -135,11 +135,11 @@ func (f *FrontendQt) SetVersion(version updater.VersionInfo) {
 }
 
 func (f *FrontendQt) NotifySilentUpdateInstalled() {
-	f.Qml.NotifySilentUpdateRestartNeeded()
+	//f.Qml.NotifySilentUpdateRestartNeeded()
 }
 
 func (f *FrontendQt) NotifySilentUpdateError(err error) {
-	f.Qml.NotifySilentUpdateError()
+	//f.Qml.NotifySilentUpdateError()
 }
 
 func (f *FrontendQt) watchEvents() {
@@ -245,11 +245,11 @@ func (f *FrontendQt) QtExecute(Procedure func(*FrontendQt) error) error {
 	f.Qml.SetCredits(importexport.Credits)
 	f.Qml.SetFullversion(f.buildVersion)
 
-	if f.settings.GetBool(settings.AutoUpdateKey) {
+	//if f.settings.GetBool(settings.AutoUpdateKey) {
-		f.Qml.SetIsAutoUpdate(true)
+	//	f.Qml.SetIsAutoUpdate(true)
-	} else {
+	//} else {
-		f.Qml.SetIsAutoUpdate(false)
+	//	f.Qml.SetIsAutoUpdate(false)
-	}
+	//}
 
 	go func() {
 		defer f.panicHandler.HandlePanic()
@@ -339,17 +339,17 @@ func (f *FrontendQt) sendBug(description, emailClient, address string) bool {
 	return true
 }
 
-func (f *FrontendQt) toggleAutoUpdate() {
+//func (f *FrontendQt) toggleAutoUpdate() {
-	defer f.Qml.ProcessFinished()
+//	defer f.Qml.ProcessFinished()
-
+//
-	if f.settings.GetBool(settings.AutoUpdateKey) {
+//	if f.settings.GetBool(settings.AutoUpdateKey) {
-		f.settings.SetBool(settings.AutoUpdateKey, false)
+//		f.settings.SetBool(settings.AutoUpdateKey, false)
-		f.Qml.SetIsAutoUpdate(false)
+//		f.Qml.SetIsAutoUpdate(false)
-	} else {
+//	} else {
-		f.settings.SetBool(settings.AutoUpdateKey, true)
+//		f.settings.SetBool(settings.AutoUpdateKey, true)
-		f.Qml.SetIsAutoUpdate(true)
+//		f.Qml.SetIsAutoUpdate(true)
-	}
+//	}
-}
+//}
 
 // checkInternet is almost idetical to bridge
 func (f *FrontendQt) checkInternet() {

internal/frontend/qt-ie/frontend_nogui.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build nogui
+// +build !build_qt
 
 package qtie
 

internal/frontend/qt-ie/import.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 
@@ -26,7 +26,7 @@ import (
 )
 
 // wrapper for QML
-func (f *FrontendQt) setupAndLoadForImport(isFromIMAP bool, sourcePath, sourceEmail, sourcePassword, sourceServer, sourcePort, targetAddress string) {
+func (f *FrontendQt) setupAndLoadForImport(isFromIMAP bool, sourcePath, sourceEmail, sourcePassword, sourceServer, sourcePort, targetUsername, targetAddress string) {
 	errCode := errUnknownError
 	var err error
 	defer func() {
@@ -39,7 +39,7 @@ func (f *FrontendQt) setupAndLoadForImport(isFromIMAP bool, sourcePath, sourceEm
 	}()
 
 	if isFromIMAP {
-		f.transfer, err = f.ie.GetRemoteImporter(targetAddress, sourceEmail, sourcePassword, sourceServer, sourcePort)
+		f.transfer, err = f.ie.GetRemoteImporter(targetUsername, targetAddress, sourceEmail, sourcePassword, sourceServer, sourcePort)
 		if err != nil {
 			switch {
 			case errors.Is(err, &transfer.ErrIMAPConnection{}):
@@ -54,7 +54,7 @@ func (f *FrontendQt) setupAndLoadForImport(isFromIMAP bool, sourcePath, sourceEm
 			return
 		}
 	} else {
-		f.transfer, err = f.ie.GetLocalImporter(targetAddress, sourcePath)
+		f.transfer, err = f.ie.GetLocalImporter(targetUsername, targetAddress, sourcePath)
 		if err != nil {
 			// The only error can be problem to load PM user and address.
 			errCode = errPMLoadFailed

internal/frontend/qt-ie/mbox.go

@@ -16,7 +16,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/notification.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/path_status.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/transfer_rules.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 

internal/frontend/qt-ie/ui.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qtie
 
@@ -33,7 +33,7 @@ type GoQMLInterface struct {
 
 	_ func() `constructor:"init"`
 
-	_ bool   `property:"isAutoUpdate"`
+	//_ bool   `property:"isAutoUpdate"`
 	_ string `property:"currentAddress"`
 	_ string `property:"goos"`
 	_ string `property:"credits"`
@@ -53,6 +53,7 @@ type GoQMLInterface struct {
 	_ string `property:"fullversion"`
 	_ string `property:"downloadLink"`
 
+	_ string `property:"updateState"`
 	_ string `property:"updateVersion"`
 	_ bool   `property:"updateCanInstall"`
 	_ string `property:"updateLandingPage"`
@@ -61,8 +62,8 @@ type GoQMLInterface struct {
 	_ func() `signal:"notifyManualUpdateRestartNeeded"`
 	_ func() `signal:"notifyManualUpdateError"`
 	_ func() `signal:"notifyForceUpdate"`
-	_ func() `signal:"notifySilentUpdateRestartNeeded"`
+	//_ func() `signal:"notifySilentUpdateRestartNeeded"`
-	_ func() `signal:"notifySilentUpdateError"`
+	//_ func() `signal:"notifySilentUpdateError"`
 	_ func() `slot:"checkForUpdates"`
 	_ func() `slot:"checkAndOpenReleaseNotes"`
 	_ func() `signal:"openReleaseNotesExternally"`
@@ -76,9 +77,8 @@ type GoQMLInterface struct {
 	_ string `property:"credentialsNotRemoved"`
 	_ string `property:"versionCheckFailed"`
 	//
-	_ func(isAvailable bool)   `signal:"setConnectionStatus"`
+	_ func(isAvailable bool) `signal:"setConnectionStatus"`
-	_ func(updateState string) `signal:"setUpdateState"`
+	_ func()                 `slot:"checkInternet"`
-	_ func()                   `slot:"checkInternet"`
 
 	_ func() `slot:"setToRestart"`
 
@@ -93,7 +93,7 @@ type GoQMLInterface struct {
 
 	_ func() `signal:"showWindow"`
 
-	_ func() `slot:"toggleAutoUpdate"`
+	//_ func() `slot:"toggleAutoUpdate"`
 	_ func() `slot:"quit"`
 	_ func() `slot:"loadAccounts"`
 	_ func() `slot:"openLogs"`
@@ -108,14 +108,14 @@ type GoQMLInterface struct {
 
 	_ func(description, client, address string) bool                                       `slot:"sendBug"`
 	_ func(address string) bool                                                            `slot:"sendImportReport"`
-	_ func(address string)                                                                 `slot:"loadStructureForExport"`
+	_ func(username, address string)                                                       `slot:"loadStructureForExport"`
 	_ func() string                                                                        `slot:"leastUsedColor"`
 	_ func(username string, name string, color string, isLabel bool, sourceID string) bool `slot:"createLabelOrFolder"`
 	_ func(fpath, address, fileType string, attachEncryptedBody bool)                      `slot:"startExport"`
 	_ func(email string, importEncrypted bool)                                             `slot:"startImport"`
 	_ func()                                                                               `slot:"resetSource"`
 
-	_ func(isFromIMAP bool, sourcePath, sourceEmail, sourcePassword, sourceServe, sourcePort, targetAddress string) `slot:"setupAndLoadForImport"`
+	_ func(isFromIMAP bool, sourcePath, sourceEmail, sourcePassword, sourceServe, sourcePort, targetUsername, targetAddress string) `slot:"setupAndLoadForImport"`
 
 	_ string `property:"progressInit"`
 
@@ -162,7 +162,7 @@ func (s *GoQMLInterface) init() {}
 func (s *GoQMLInterface) SetFrontend(f *FrontendQt) {
 	s.ConnectQuit(f.App.Quit)
 
-	s.ConnectToggleAutoUpdate(f.toggleAutoUpdate)
+	//s.ConnectToggleAutoUpdate(f.toggleAutoUpdate)
 	s.ConnectLoadAccounts(f.Accounts.LoadAccounts)
 	s.ConnectOpenLogs(f.openLogs)
 	s.ConnectOpenDownloadLink(f.openDownloadLink)
@@ -207,4 +207,6 @@ func (s *GoQMLInterface) SetFrontend(f *FrontendQt) {
 	s.ConnectCheckPathStatus(CheckPathStatus)
 
 	s.ConnectEmitEvent(f.emitEvent)
+
+	s.ConnectStartManualUpdate(f.startManualUpdate)
 }

internal/frontend/qt/accountModel.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qt
 

internal/frontend/qt/accounts.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qt
 
@@ -84,7 +84,7 @@ func (s *FrontendQt) clearCache() {
 
 	channel := s.bridge.GetUpdateChannel()
 	if channel == updater.EarlyChannel {
-		if err := s.bridge.SetUpdateChannel(updater.StableChannel); err != nil {
+		if _, err := s.bridge.SetUpdateChannel(updater.StableChannel); err != nil {
 			s.Qml.NotifyManualUpdateError()
 			return
 		}

internal/frontend/qt/frontend.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 // Package qt is the Qt User interface for Desktop bridge.
 //
@@ -39,16 +39,17 @@ import (
 	"github.com/ProtonMail/go-autostart"
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/autoconfig"
 	qtcommon "github.com/ProtonMail/proton-bridge/internal/frontend/qt-common"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/types"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
+	"github.com/ProtonMail/proton-bridge/pkg/keychain"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
 	"github.com/ProtonMail/proton-bridge/pkg/ports"
-	"github.com/ProtonMail/proton-bridge/pkg/useragent"
 	"github.com/sirupsen/logrus"
 	"github.com/skratchdot/open-golang/open"
 	"github.com/therecipe/qt/core"
@@ -74,6 +75,7 @@ type FrontendQt struct {
 	settings          *settings.Settings
 	eventListener     listener.Listener
 	updater           types.Updater
+	userAgent         *useragent.UserAgent
 	bridge            types.Bridger
 	noEncConfirmator  types.NoEncConfirmator
 
@@ -113,12 +115,15 @@ func New(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge types.Bridger,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,
 	restarter types.Restarter,
 ) *FrontendQt {
-	tmp := &FrontendQt{
+	userAgent.SetPlatform(core.QSysInfo_PrettyProductName())
+
+	f := &FrontendQt{
 		version:           version,
 		buildVersion:      buildVersion,
 		programName:       programName,
@@ -128,6 +133,7 @@ func New(
 		settings:          settings,
 		eventListener:     eventListener,
 		updater:           updater,
+		userAgent:         userAgent,
 		bridge:            bridge,
 		noEncConfirmator:  noEncConfirmator,
 		programVer:        "v" + version,
@@ -137,13 +143,9 @@ func New(
 
 	// Initializing.Done is only called sync.Once. Please keep the increment
 	// set to 1
-	tmp.initializing.Add(1)
+	f.initializing.Add(1)
 
-	// Nicer string for OS.
+	return f
-	currentOS := core.QSysInfo_PrettyProductName()
-	bridge.SetCurrentOS(currentOS)
-
-	return tmp
 }
 
 // InstanceExistAlert is a global warning window indicating an instance already exists.
@@ -338,39 +340,46 @@ func (s *FrontendQt) qtExecute(Procedure func(*FrontendQt) error) error {
 	s.Qml.SetCredits(bridge.Credits)
 	s.Qml.SetFullversion(s.buildVersion)
 
-	// Autostart.
+	// Autostart: rewrite the current definition of autostart
-	if s.Qml.IsFirstStart() {
+	//  - when it is the first time
-		if s.autostart.IsEnabled() {
+	//  - when starting after clear cache
+	//  - when there is already autostart file from past
+	//
+	//  This will make sure that autostart will use the latest path to
+	//  launcher or bridge.
+	isAutoStartEnabled := s.autostart.IsEnabled()
+	if s.Qml.IsFirstStart() || isAutoStartEnabled {
+		if isAutoStartEnabled {
 			if err := s.autostart.Disable(); err != nil {
-				log.Error("First disable ", err)
+				log.
+					WithField("first", s.Qml.IsFirstStart()).
+					WithField("wasEnabled", isAutoStartEnabled).
+					WithError(err).
+					Error("Disable on start failed.")
 				s.autostartError(err)
 			}
 		}
-		s.toggleAutoStart()
+		if err := s.autostart.Enable(); err != nil {
-	}
+			log.
-	if s.autostart.IsEnabled() {
+				WithField("first", s.Qml.IsFirstStart()).
-		s.Qml.SetIsAutoStart(true)
+				WithField("wasEnabled", isAutoStartEnabled).
-	} else {
+				WithError(err).
-		s.Qml.SetIsAutoStart(false)
+				Error("Enable on start failed.")
+			s.autostartError(err)
+		}
 	}
+	s.Qml.SetIsAutoStart(s.autostart.IsEnabled())
 
-	if s.settings.GetBool(settings.AutoUpdateKey) {
+	s.Qml.SetIsAutoUpdate(s.settings.GetBool(settings.AutoUpdateKey))
-		s.Qml.SetIsAutoUpdate(true)
+	s.Qml.SetIsProxyAllowed(s.settings.GetBool(settings.AllowProxyKey))
-	} else {
+	s.Qml.SetIsEarlyAccess(updater.UpdateChannel(s.settings.Get(settings.UpdateChannelKey)) == updater.EarlyChannel)
-		s.Qml.SetIsAutoUpdate(false)
-	}
 
-	if s.settings.GetBool(settings.AllowProxyKey) {
+	availableKeychain := []string{}
-		s.Qml.SetIsProxyAllowed(true)
+	for chain := range keychain.Helpers {
-	} else {
+		availableKeychain = append(availableKeychain, chain)
-		s.Qml.SetIsProxyAllowed(false)
-	}
-
-	if updater.UpdateChannel(s.settings.Get(settings.UpdateChannelKey)) == updater.EarlyChannel {
-		s.Qml.SetIsEarlyAccess(true)
-	} else {
-		s.Qml.SetIsEarlyAccess(false)
 	}
+	s.Qml.SetAvailableKeychain(availableKeychain)
+	s.Qml.SetSelectedKeychain(s.settings.Get(settings.PreferredKeychainKey))
 
 	// Set reporting of outgoing email without encryption.
 	s.Qml.SetIsReportingOutgoingNoEnc(s.settings.GetBool(settings.ReportOutgoingNoEncKey))
@@ -497,7 +506,7 @@ func (s *FrontendQt) sendBug(description, client, address string) (isOK bool) {
 }
 
 func (s *FrontendQt) getLastMailClient() string {
-	return s.bridge.GetCurrentClient()
+	return s.userAgent.String()
 }
 
 func (s *FrontendQt) configureAppleMail(iAccount, iAddress int) {
@@ -547,20 +556,22 @@ func (s *FrontendQt) configureAppleMail(iAccount, iAddress int) {
 func (s *FrontendQt) toggleAutoStart() {
 	defer s.Qml.ProcessFinished()
 	var err error
-	if s.autostart.IsEnabled() {
+	wasEnabled := s.autostart.IsEnabled()
+	if wasEnabled {
 		err = s.autostart.Disable()
 	} else {
 		err = s.autostart.Enable()
 	}
+	isEnabled := s.autostart.IsEnabled()
 	if err != nil {
-		log.Error("Enable autostart: ", err)
+		log.
+			WithField("wasEnabled", wasEnabled).
+			WithField("isEnabled", isEnabled).
+			WithError(err).
+			Error("Autostart change failed.")
 		s.autostartError(err)
 	}
-	if s.autostart.IsEnabled() {
+	s.Qml.SetIsAutoStart(isEnabled)
-		s.Qml.SetIsAutoStart(true)
-	} else {
-		s.Qml.SetIsAutoStart(false)
-	}
 }
 
 func (s *FrontendQt) toggleAutoUpdate() {
@@ -585,14 +596,16 @@ func (s *FrontendQt) toggleEarlyAccess() {
 		channel = updater.EarlyChannel
 	}
 
-	err := s.bridge.SetUpdateChannel(channel)
+	needRestart, err := s.bridge.SetUpdateChannel(channel)
 	s.Qml.SetIsEarlyAccess(channel == updater.EarlyChannel)
 	if err != nil {
 		s.Qml.NotifyManualUpdateError()
 		return
 	}
-	s.restarter.SetToRestart()
+	if needRestart {
-	s.App.Quit()
+		s.restarter.SetToRestart()
+		s.App.Quit()
+	}
 }
 
 func (s *FrontendQt) toggleAllowProxy() {
@@ -711,3 +724,16 @@ func (s *FrontendQt) setGUIIsReady() {
 		s.initializing.Done()
 	})
 }
+
+func (s *FrontendQt) getKeychain() string {
+	return s.bridge.GetKeychainApp()
+}
+
+func (s *FrontendQt) setKeychain(keychain string) {
+	if keychain != s.bridge.GetKeychainApp() {
+		s.bridge.SetKeychainApp(keychain)
+
+		s.restarter.SetToRestart()
+		s.App.Quit()
+	}
+}

internal/frontend/qt/frontend_nogui.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build nogui
+// +build !build_qt
 
 package qt
 
@@ -25,6 +25,7 @@ import (
 
 	"github.com/ProtonMail/go-autostart"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/types"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
@@ -71,6 +72,7 @@ func New(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge types.Bridger,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,

internal/frontend/qt/helpers.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qt
 

internal/frontend/qt/notification.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qt
 

internal/frontend/qt/systray.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qt
 

internal/frontend/qt/ui.go

@@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
-// +build !nogui
+// +build build_qt
 
 package qt
 
@@ -50,6 +50,7 @@ type GoQMLInterface struct {
 	_ string `property:"fullversion"`
 	_ string `property:"downloadLink"`
 
+	_ string `property:"updateState"`
 	_ string `property:"updateVersion"`
 	_ bool   `property:"updateCanInstall"`
 	_ string `property:"updateLandingPage"`
@@ -66,6 +67,9 @@ type GoQMLInterface struct {
 	_ func() `slot:"startManualUpdate"`
 	_ func() `slot:"guiIsReady"`
 
+	_ []string `property:"availableKeychain"`
+	_ string   `property:"selectedKeychain"`
+
 	// Translations.
 	_ string `property:"wrongCredentials"`
 	_ string `property:"wrongMailboxPassword"`
@@ -79,9 +83,8 @@ type GoQMLInterface struct {
 	_ float32 `property:"progress"`
 	_ string  `property:"progressDescription"`
 
-	_ func(isAvailable bool)   `signal:"setConnectionStatus"`
+	_ func(isAvailable bool) `signal:"setConnectionStatus"`
-	_ func(updateState string) `signal:"setUpdateState"`
+	_ func()                 `slot:"checkInternet"`
-	_ func()                   `slot:"checkInternet"`
 
 	_ func() `slot:"setToRestart"`
 
@@ -209,4 +212,7 @@ func (s *GoQMLInterface) SetFrontend(f *FrontendQt) {
 	s.ConnectToggleIsReportingOutgoingNoEnc(f.toggleIsReportingOutgoingNoEnc)
 	s.ConnectShouldSendAnswer(f.shouldSendAnswer)
 	s.ConnectSaveOutgoingNoEncPopupCoord(f.saveOutgoingNoEncPopupCoord)
+
+	s.ConnectSetSelectedKeychain(f.setKeychain)
+	s.ConnectSelectedKeychain(f.getKeychain)
 }

internal/frontend/resources.qrc

@@ -61,6 +61,7 @@
         <file alias="BubbleMenu.qml"         >./qml/BridgeUI/BubbleMenu.qml</file>
         <file alias="Credits.qml"            >./qml/BridgeUI/Credits.qml</file>
         <file alias="DialogFirstStart.qml"   >./qml/BridgeUI/DialogFirstStart.qml</file>
+        <file alias="DialogKeychainChange.qml"   >./qml/BridgeUI/DialogKeychainChange.qml</file>
         <file alias="DialogPortChange.qml"   >./qml/BridgeUI/DialogPortChange.qml</file>
         <file alias="DialogYesNo.qml"        >./qml/BridgeUI/DialogYesNo.qml</file>
         <file alias="DialogTLSCertInfo.qml"  >./qml/BridgeUI/DialogTLSCertInfo.qml</file>

internal/frontend/share/icon.rc

@@ -1 +0,0 @@
-IDI_ICON1 ICON DISCARDABLE "logo.ico"

internal/frontend/share/info.rc

@@ -0,0 +1,45 @@
+#define STRINGIZE_(x) #x
+#define STRINGIZE(x) STRINGIZE_(x)
+
+IDI_ICON1 ICON DISCARDABLE STRINGIZE(ICO_FILE)
+
+#if defined BUILD_BRIDGE
+    #define FILE_COMMENTS "The Bridge is an application that runs on your computer in the background and seamlessly encrypts and decrypts your mail as it enters and leaves your computer."
+    #define FILE_DESCRIPTION "ProtonMail Bridge"
+    #define INTERNAL_NAME STRINGIZE(EXE_NAME)
+    #define PRODUCT_NAME "ProtonMail Bridge for Windows"
+#elif defined BUILD_IE
+    #define FILE_COMMENTS "The Import-Export app helps you to migrate your emails from local files or remote IMAP servers to ProtonMail or simply export emails to local folder."
+    #define FILE_DESCRIPTION "ProtonMail Import-Export app"
+    #define INTERNAL_NAME STRINGIZE(EXE_NAME)
+    #define PRODUCT_NAME "ProtonMail Import-Export app for Windows"
+#else
+    #error No target specified
+#endif
+
+#define LEGAL_COPYRIGHT "(C) " STRINGIZE(YEAR) " Proton Technologies AG"
+
+1 VERSIONINFO
+FILEVERSION     FILE_VERSION_COMMA,0
+PRODUCTVERSION  FILE_VERSION_COMMA,0
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904b0"
+        BEGIN
+            VALUE "Comments", FILE_COMMENTS
+            VALUE "CompanyName", "Proton Technologies AG"
+            VALUE "FileDescription", FILE_DESCRIPTION
+            VALUE "FileVersion", STRINGIZE(FILE_VERSION)
+            VALUE "InternalName", INTERNAL_NAME
+            VALUE "LegalCopyright", LEGAL_COPYRIGHT
+            VALUE "OriginalFilename", STRINGIZE(ORIGINAL_FILE_NAME)
+            VALUE "ProductName", PRODUCT_NAME
+            VALUE "ProductVersion", STRINGIZE(PRODUCT_VERSION)
+        END
+    END
+    BLOCK "VarFileInfo"
+    BEGIN
+        VALUE "Translation", 0x0409, 0x04B0
+    END
+END

internal/frontend/types/types.go

@@ -75,13 +75,13 @@ type User interface {
 type Bridger interface {
 	UserManager
 
-	GetCurrentClient() string
-	SetCurrentOS(os string)
 	ReportBug(osType, osVersion, description, accountName, address, emailClient string) error
 	AllowProxy()
 	DisallowProxy()
 	GetUpdateChannel() updater.UpdateChannel
-	SetUpdateChannel(updater.UpdateChannel) error
+	SetUpdateChannel(updater.UpdateChannel) (needRestart bool, err error)
+	GetKeychainApp() string
+	SetKeychainApp(keychain string)
 }
 
 type bridgeWrap struct {
@@ -114,10 +114,10 @@ func (b *bridgeWrap) GetUser(query string) (User, error) {
 type ImportExporter interface {
 	UserManager
 
-	GetLocalImporter(string, string) (*transfer.Transfer, error)
+	GetLocalImporter(string, string, string) (*transfer.Transfer, error)
-	GetRemoteImporter(string, string, string, string, string) (*transfer.Transfer, error)
+	GetRemoteImporter(string, string, string, string, string, string) (*transfer.Transfer, error)
-	GetEMLExporter(string, string) (*transfer.Transfer, error)
+	GetEMLExporter(string, string, string) (*transfer.Transfer, error)
-	GetMBOXExporter(string, string) (*transfer.Transfer, error)
+	GetMBOXExporter(string, string, string) (*transfer.Transfer, error)
 	ReportBug(osType, osVersion, description, accountName, address, emailClient string) error
 	ReportFile(osType, osVersion, accountName, address string, logdata []byte) error
 }

internal/imap/backend.go

@@ -16,6 +16,19 @@
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
 
 // Package imap provides IMAP server of the Bridge.
+//
+// Methods are called by the go-imap library in parallel.
+// Additional parallelism is achieved while handling each IMAP request.
+//
+// For example, ListMessages internally uses `fetchWorkers` workers to resolve each requested item.
+// When IMAP clients request message literals (or parts thereof), we sometimes need to build RFC822 message literals.
+// To do this, we pass build jobs to the message builder, which internally manages its own parallelism.
+// Summary:
+//  - each IMAP fetch request is handled in parallel,
+//  - within each IMAP fetch request, individual items are handled by a pool of `fetchWorkers` workers,
+//  - within each worker, build jobs are posted to the message builder,
+//  - the message builder handles build jobs using its own, independent worker pool,
+// The builder will handle jobs in parallel up to its own internal limit. This prevents it from overwhelming API.
 package imap
 
 import (
@@ -26,10 +39,19 @@ import (
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
+	"github.com/ProtonMail/proton-bridge/pkg/message"
 	"github.com/emersion/go-imap"
 	goIMAPBackend "github.com/emersion/go-imap/backend"
 )
 
+const (
+	// NOTE: Each fetch worker has its own set of attach workers so there can be up to 20*5=100 API requests at once.
+	// This is a reasonable limit to not overwhelm API while still maintaining as much parallelism as possible.
+	fetchWorkers  = 20 // In how many workers to fetch message (group list on IMAP).
+	attachWorkers = 5  // In how many workers to fetch attachments (for one message).
+	buildWorkers  = 20 // In how many workers to build messages.
+)
+
 type panicHandler interface {
 	HandlePanic()
 }
@@ -43,6 +65,8 @@ type imapBackend struct {
 	users       map[string]*imapUser
 	usersLocker sync.Locker
 
+	builder *message.Builder
+
 	imapCache     map[string]map[string]string
 	imapCachePath string
 	imapCacheLock *sync.RWMutex
@@ -78,6 +102,8 @@ func newIMAPBackend(
 		users:       map[string]*imapUser{},
 		usersLocker: &sync.Mutex{},
 
+		builder: message.NewBuilder(fetchWorkers, attachWorkers, buildWorkers),
+
 		imapCachePath: cache.GetIMAPCachePath(),
 		imapCacheLock: &sync.RWMutex{},
 	}

internal/imap/bridge.go

@@ -29,7 +29,6 @@ type cacheProvider interface {
 }
 
 type bridger interface {
-	SetCurrentClient(clientName, clientVersion string)
 	GetUser(query string) (bridgeUser, error)
 }
 
@@ -62,7 +61,7 @@ func (b *bridgeWrap) GetUser(query string) (bridgeUser, error) {
 	if err != nil {
 		return nil, err
 	}
-	return newBridgeUserWrap(user), nil
+	return newBridgeUserWrap(user), nil //nolint[typecheck] missing methods are inherited
 }
 
 type bridgeUserWrap struct {
@@ -78,5 +77,5 @@ func (u *bridgeUserWrap) GetStore() storeUserProvider {
 	if store == nil {
 		return nil
 	}
-	return newStoreUserWrap(store)
+	return newStoreUserWrap(store) //nolint[typecheck] missing methods are inherited
 }

internal/imap/id/extension.go

@@ -23,13 +23,13 @@ import (
 )
 
 type currentClientSetter interface {
-	SetCurrentClient(name, version string)
+	SetClient(name, version string)
 }
 
-// Extension for IMAP server
+// Extension for IMAP server.
 type extension struct {
-	extID  imapserver.ConnExtension
+	extID        imapserver.ConnExtension
-	setter currentClientSetter
+	clientSetter currentClientSetter
 }
 
 func (ext *extension) Capabilities(conn imapserver.Conn) []string {
@@ -44,8 +44,8 @@ func (ext *extension) Command(name string) imapserver.HandlerFactory {
 	return func() imapserver.Handler {
 		if hdlrID, ok := newIDHandler().(*imapid.Handler); ok {
 			return &handler{
-				hdlrID: hdlrID,
+				hdlrID:       hdlrID,
-				setter: ext.setter,
+				clientSetter: ext.clientSetter,
 			}
 		}
 		return nil
@@ -57,8 +57,8 @@ func (ext *extension) NewConn(conn imapserver.Conn) imapserver.Conn {
 }
 
 type handler struct {
-	hdlrID *imapid.Handler
+	hdlrID       *imapid.Handler
-	setter currentClientSetter
+	clientSetter currentClientSetter
 }
 
 func (hdlr *handler) Parse(fields []interface{}) error {
@@ -69,21 +69,18 @@ func (hdlr *handler) Handle(conn imapserver.Conn) error {
 	err := hdlr.hdlrID.Handle(conn)
 	if err == nil {
 		id := hdlr.hdlrID.Command.ID
-		hdlr.setter.SetCurrentClient(
+		hdlr.clientSetter.SetClient(id[imapid.FieldName], id[imapid.FieldVersion])
-			id[imapid.FieldName],
-			id[imapid.FieldVersion],
-		)
 	}
 	return err
 }
 
 // NewExtension returns extension which is adding RFC2871 ID capability, with
 // direct interface to set information about email client to backend.
-func NewExtension(serverID imapid.ID, setter currentClientSetter) imapserver.Extension {
+func NewExtension(serverID imapid.ID, clientSetter currentClientSetter) imapserver.Extension {
 	if conExtID, ok := imapid.NewExtension(serverID).(imapserver.ConnExtension); ok {
 		return &extension{
-			extID:  conExtID,
+			extID:        conExtID,
-			setter: setter,
+			clientSetter: clientSetter,
 		}
 	}
 	return nil

internal/imap/imap.go

@@ -19,11 +19,4 @@ package imap
 
 import "github.com/sirupsen/logrus"
 
-const (
+var log = logrus.WithField("pkg", "imap") //nolint[gochecknoglobals]
-	fetchMessagesWorkers    = 5 // In how many workers to fetch message (group list on IMAP).
-	fetchAttachmentsWorkers = 5 // In how many workers to fetch attachments (for one message).
-)
-
-var (
-	log = logrus.WithField("pkg", "imap") //nolint[gochecknoglobals]
-)

internal/imap/mailbox.go

@@ -19,6 +19,7 @@ package imap
 
 import (
 	"strings"
+	"time"
 
 	"github.com/ProtonMail/proton-bridge/pkg/message"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
@@ -36,10 +37,12 @@ type imapMailbox struct {
 	storeUser    storeUserProvider
 	storeAddress storeAddressProvider
 	storeMailbox storeMailboxProvider
+
+	builder *message.Builder
 }
 
 // newIMAPMailbox returns struct implementing go-imap/mailbox interface.
-func newIMAPMailbox(panicHandler panicHandler, user *imapUser, storeMailbox storeMailboxProvider) *imapMailbox {
+func newIMAPMailbox(panicHandler panicHandler, user *imapUser, storeMailbox storeMailboxProvider, builder *message.Builder) *imapMailbox {
 	return &imapMailbox{
 		panicHandler: panicHandler,
 		user:         user,
@@ -53,9 +56,30 @@ func newIMAPMailbox(panicHandler panicHandler, user *imapUser, storeMailbox stor
 		storeUser:    user.storeUser,
 		storeAddress: user.storeAddress,
 		storeMailbox: storeMailbox,
+
+		builder: builder,
 	}
 }
 
+// logCommand is helper to log commands requested by IMAP client with their
+// params, result, and duration, but without private data.
+// It's logged as INFO so it's logged for every user by default. This should
+// help devs to find out reasons why clients, mostly Apple Mail, does re-sync.
+// FETCH, APPEND, STORE, COPY, MOVE, and EXPUNGE should be using this helper.
+func (im *imapMailbox) logCommand(callback func() error, cmd string, params ...interface{}) error {
+	start := time.Now()
+	err := callback()
+	// Not using im.log to not include addressID which is not needed in this case.
+	log.WithFields(logrus.Fields{
+		"userID":   im.storeUser.UserID(),
+		"labelID":  im.storeMailbox.LabelID(),
+		"duration": time.Since(start),
+		"err":      err,
+		"params":   params,
+	}).Info(cmd)
+	return err
+}
+
 // Name returns this mailbox name.
 func (im *imapMailbox) Name() string {
 	// Called from go-imap in goroutines - we need to handle panics for each function.
@@ -177,17 +201,16 @@ func (im *imapMailbox) Check() error {
 // Expunge permanently removes all messages that have the \Deleted flag set
 // from the currently selected mailbox.
 func (im *imapMailbox) Expunge() error {
-	// Wait for any APPENDS to finish in order to avoid data loss when
+	// See comment of appendExpungeLock.
-	// Outlook sends commands too quickly STORE \Deleted, APPEND, EXPUNGE,
+	if im.storeMailbox.LabelID() == pmapi.TrashLabel || im.storeMailbox.LabelID() == pmapi.SpamLabel {
-	// APPEND FINISHED:
+		im.user.appendExpungeLock.Lock()
-	//
+		defer im.user.appendExpungeLock.Unlock()
-	// Based on Outlook APPEND request we will not create new message but
+	}
-	// move the original to desired mailbox. If the message is currently
-	// in Trash or Spam and EXPUNGE happens before APPEND processing is
-	// finished the message is deleted from Proton instead of moved to
-	// the desired mailbox.
-	im.user.waitForAppend()
 
+	return im.logCommand(im.expunge, "EXPUNGE")
+}
+
+func (im *imapMailbox) expunge() error {
 	im.user.backend.updates.block(im.user.currentAddressLowercase, im.name, operationDeleteMessage)
 	defer im.user.backend.updates.unblock(im.user.currentAddressLowercase, im.name, operationDeleteMessage)
 
@@ -197,6 +220,18 @@ func (im *imapMailbox) Expunge() error {
 // UIDExpunge permanently removes messages that have the \Deleted flag set
 // and UID passed from SeqSet from the currently selected mailbox.
 func (im *imapMailbox) UIDExpunge(seqSet *imap.SeqSet) error {
+	return im.logCommand(func() error {
+		return im.uidExpunge(seqSet)
+	}, "UID EXPUNGE", seqSet)
+}
+
+func (im *imapMailbox) uidExpunge(seqSet *imap.SeqSet) error {
+	// See comment of appendExpungeLock.
+	if im.storeMailbox.LabelID() == pmapi.TrashLabel || im.storeMailbox.LabelID() == pmapi.SpamLabel {
+		im.user.appendExpungeLock.Lock()
+		defer im.user.appendExpungeLock.Unlock()
+	}
+
 	im.user.backend.updates.block(im.user.currentAddressLowercase, im.name, operationDeleteMessage)
 	defer im.user.backend.updates.unblock(im.user.currentAddressLowercase, im.name, operationDeleteMessage)
 

internal/imap/mailbox_message.go

@@ -19,9 +19,9 @@ package imap
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"io"
-	"mime/multipart"
 	"net/mail"
 	"net/textproto"
 	"sort"
@@ -32,12 +32,10 @@ import (
 	"github.com/ProtonMail/proton-bridge/internal/imap/cache"
 	"github.com/ProtonMail/proton-bridge/internal/imap/uidplus"
 	"github.com/ProtonMail/proton-bridge/pkg/message"
-	"github.com/ProtonMail/proton-bridge/pkg/parallel"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
 	"github.com/emersion/go-imap"
 	"github.com/hashicorp/go-multierror"
 	"github.com/pkg/errors"
-	openpgperrors "golang.org/x/crypto/openpgp/errors"
 )
 
 var (
@@ -66,13 +64,16 @@ func (dnc *doNotCacheError) errorOrNil() error {
 //
 // If the Backend implements Updater, it must notify the client immediately
 // via a mailbox update.
-func (im *imapMailbox) CreateMessage(flags []string, date time.Time, body imap.Literal) error { // nolint[funlen]
+func (im *imapMailbox) CreateMessage(flags []string, date time.Time, body imap.Literal) error {
+	return im.logCommand(func() error {
+		return im.createMessage(flags, date, body)
+	}, "APPEND", flags, date)
+}
+
+func (im *imapMailbox) createMessage(flags []string, date time.Time, body imap.Literal) error { // nolint[funlen]
 	// Called from go-imap in goroutines - we need to handle panics for each function.
 	defer im.panicHandler.HandlePanic()
 
-	im.user.appendStarted()
-	defer im.user.appendFinished()
-
 	m, _, _, readers, err := message.Parse(body)
 	if err != nil {
 		return err
@@ -154,6 +155,9 @@ func (im *imapMailbox) CreateMessage(flags []string, date time.Time, body imap.L
 		}
 	}
 
+	im.user.appendExpungeLock.Lock()
+	defer im.user.appendExpungeLock.Unlock()
+
 	// Avoid appending a message which is already on the server. Apply the
 	// new label instead. This always happens with Outlook (it uses APPEND
 	// instead of COPY).
@@ -175,7 +179,7 @@ func (im *imapMailbox) CreateMessage(flags []string, date time.Time, body imap.L
 				return err
 			}
 
-			targetSeq := im.storeMailbox.GetUIDList([]string{m.ID})
+			targetSeq := im.storeMailbox.GetUIDList(IDs)
 			return uidplus.AppendResponse(im.storeMailbox.UIDValidity(), targetSeq)
 		}
 	}
@@ -220,8 +224,9 @@ func (im *imapMailbox) importMessage(m *pmapi.Message, readers []io.Reader, kr *
 	return im.storeMailbox.ImportMessage(m, body, labels)
 }
 
-func (im *imapMailbox) getMessage(storeMessage storeMessageProvider, items []imap.FetchItem) (msg *imap.Message, err error) {
+func (im *imapMailbox) getMessage(storeMessage storeMessageProvider, items []imap.FetchItem, msgBuildCountHistogram *msgBuildCountHistogram) (msg *imap.Message, err error) { //nolint[funlen]
-	im.log.WithField("msgID", storeMessage.ID()).Trace("Getting message")
+	msglog := im.log.WithField("msgID", storeMessage.ID())
+	msglog.Trace("Getting message")
 
 	seqNum, err := storeMessage.SequenceNumber()
 	if err != nil {
@@ -234,7 +239,9 @@ func (im *imapMailbox) getMessage(storeMessage storeMessageProvider, items []ima
 	for _, item := range items {
 		switch item {
 		case imap.FetchEnvelope:
-			msg.Envelope = message.GetEnvelope(m)
+			// No need to check IsFullHeaderCached here. API header
+			// contain enough information to build the envelope.
+			msg.Envelope = message.GetEnvelope(m, storeMessage.GetHeader())
 		case imap.FetchBody, imap.FetchBodyStructure:
 			var structure *message.BodyStructure
 			structure, err = im.getBodyStructure(storeMessage)
@@ -261,8 +268,13 @@ func (im *imapMailbox) getMessage(storeMessage storeMessageProvider, items []ima
 			// Size attribute on the server counts encrypted data. The value is cleared
 			// on our part and we need to compute "real" size of decrypted data.
 			if m.Size <= 0 {
-				im.log.WithField("msgID", storeMessage.ID()).Trace("Size unknown - downloading body")
+				msglog.Debug("Size unknown - downloading body")
-				if _, _, err = im.getBodyAndStructure(storeMessage); err != nil {
+				// We are sure the size is not a problem right now. Clients
+				// might not first check sizes of all messages so we couldn't
+				// be sure if seeing 1st or 2nd sync is all right or not.
+				// Therefore, it's better to exclude getting size from the
+				// counting and see build count as real message build.
+				if _, _, err = im.getBodyAndStructure(storeMessage, nil); err != nil {
 					return
 				}
 			}
@@ -272,8 +284,10 @@ func (im *imapMailbox) getMessage(storeMessage storeMessageProvider, items []ima
 			if err != nil {
 				return nil, err
 			}
+		case imap.FetchAll, imap.FetchFast, imap.FetchFull, imap.FetchRFC822, imap.FetchRFC822Header, imap.FetchRFC822Text:
+			fallthrough // this is list of defined items by go-imap, but items can be also sections generated from requests
 		default:
-			if err = im.getLiteralForSection(item, msg, storeMessage); err != nil {
+			if err = im.getLiteralForSection(item, msg, storeMessage, msgBuildCountHistogram); err != nil {
 				return
 			}
 		}
@@ -282,14 +296,15 @@ func (im *imapMailbox) getMessage(storeMessage storeMessageProvider, items []ima
 	return msg, err
 }
 
-func (im *imapMailbox) getLiteralForSection(itemSection imap.FetchItem, msg *imap.Message, storeMessage storeMessageProvider) error {
+func (im *imapMailbox) getLiteralForSection(itemSection imap.FetchItem, msg *imap.Message, storeMessage storeMessageProvider, msgBuildCountHistogram *msgBuildCountHistogram) error {
 	section, err := imap.ParseBodySectionName(itemSection)
-	if err != nil { // Ignore error
+	if err != nil {
-		return nil
+		log.WithError(err).Warn("Failed to parse body section name; part will be skipped")
+		return nil //nolint[nilerr] ignore error
 	}
 
 	var literal imap.Literal
-	if literal, err = im.getMessageBodySection(storeMessage, section); err != nil {
+	if literal, err = im.getMessageBodySection(storeMessage, section, msgBuildCountHistogram); err != nil {
 		return err
 	}
 
@@ -307,14 +322,20 @@ func (im *imapMailbox) getBodyStructure(storeMessage storeMessageProvider) (bs *
 		im.log.WithError(err).Debug("Fail to retrieve bodystructure from database")
 	}
 	if bs == nil {
-		if bs, _, err = im.getBodyAndStructure(storeMessage); err != nil {
+		// We are sure the body structure is not a problem right now.
+		// Clients might do first fetch body structure so we couldn't
+		// be sure if seeing 1st or 2nd sync is all right or not.
+		// Therefore, it's better to exclude first body structure fetch
+		// from the counting and see build count as real message build.
+		if bs, _, err = im.getBodyAndStructure(storeMessage, nil); err != nil {
 			return
 		}
 	}
 	return
 }
 
-func (im *imapMailbox) getBodyAndStructure(storeMessage storeMessageProvider) (
+//nolint[funlen] Jakub will fix in refactor
+func (im *imapMailbox) getBodyAndStructure(storeMessage storeMessageProvider, msgBuildCountHistogram *msgBuildCountHistogram) (
 	structure *message.BodyStructure,
 	bodyReader *bytes.Reader, err error,
 ) {
@@ -341,10 +362,26 @@ func (im *imapMailbox) getBodyAndStructure(storeMessage storeMessageProvider) (
 			}
 		}
 		if err == nil && structure != nil && len(body) > 0 {
-			if err := storeMessage.SetContentTypeAndHeader(m.MIMEType, m.Header); err != nil {
+			header, errHead := structure.GetMailHeaderBytes(bytes.NewReader(body))
-				im.log.WithError(err).
+			if errHead == nil {
+				if errHead := storeMessage.SetHeader(header); errHead != nil {
+					im.log.WithError(errHead).
+						WithField("msgID", m.ID).
+						Warn("Cannot update header after building")
+				}
+			} else {
+				im.log.WithError(errHead).
 					WithField("msgID", m.ID).
-					Warn("Cannot update header while building")
+					Warn("Cannot get header bytes after building")
+			}
+			if msgBuildCountHistogram != nil {
+				times, err := storeMessage.IncreaseBuildCount()
+				if err != nil {
+					im.log.WithError(err).
+						WithField("msgID", m.ID).
+						Warn("Cannot increase build count")
+				}
+				msgBuildCountHistogram.add(times)
 			}
 			// Drafts can change and we don't want to cache them.
 			if !isMessageInDraftFolder(m) {
@@ -373,40 +410,32 @@ func isMessageInDraftFolder(m *pmapi.Message) bool {
 
 // This will download message (or read from cache) and pick up the section,
 // extract data (header,body, both) and trim the output if needed.
-func (im *imapMailbox) getMessageBodySection(storeMessage storeMessageProvider, section *imap.BodySectionName) (literal imap.Literal, err error) { // nolint[funlen]
+func (im *imapMailbox) getMessageBodySection(
-	var (
+	storeMessage storeMessageProvider,
-		structure  *message.BodyStructure
+	section *imap.BodySectionName,
-		bodyReader *bytes.Reader
+	msgBuildCountHistogram *msgBuildCountHistogram,
-		header     textproto.MIMEHeader
+) (imap.Literal, error) {
-		response   []byte
+	var header textproto.MIMEHeader
-	)
+	var response []byte
 
 	im.log.WithField("msgID", storeMessage.ID()).Trace("Getting message body")
 
-	m := storeMessage.Message()
+	isMainHeaderRequested := len(section.Path) == 0 && section.Specifier == imap.HeaderSpecifier
-
+	if isMainHeaderRequested && storeMessage.IsFullHeaderCached() {
-	if len(section.Path) == 0 && section.Specifier == imap.HeaderSpecifier {
+		// In order to speed up (avoid download and decryptions) we
-		// We can extract message header without decrypting.
+		// cache the header. If a mail header was requested and DB
-		header = message.GetHeader(m)
+		// contains full header (it means it was already built once)
-		// We need to ensure we use the correct content-type,
+		// the DB header can be used without downloading and decrypting.
-		// otherwise AppleMail expects `text/plain` in HTML mails.
+		// Otherwise header is incomplete and clients would have issues
-		if header.Get("Content-Type") == "" {
+		// e.g. AppleMail expects `text/plain` in HTML mails.
-			if err = im.fetchMessage(m); err != nil {
+		header = storeMessage.GetHeader()
-				return
-			}
-			if _, err = im.setMessageContentType(m); err != nil {
-				return
-			}
-			if err = storeMessage.SetContentTypeAndHeader(m.MIMEType, m.Header); err != nil {
-				return
-			}
-			header = message.GetHeader(m)
-		}
 	} else {
-		// The rest of cases need download and decrypt.
+		// For all other cases it is necessary to download and decrypt the message
-		structure, bodyReader, err = im.getBodyAndStructure(storeMessage)
+		// and drop the header which was obtained from cache. The header will
+		// will be stored in DB once successfully built. Check `getBodyAndStructure`.
+		structure, bodyReader, err := im.getBodyAndStructure(storeMessage, msgBuildCountHistogram)
 		if err != nil {
-			return
+			return nil, err
 		}
 
 		switch {
@@ -417,368 +446,86 @@ func (im *imapMailbox) getMessageBodySection(storeMessage storeMessageProvider,
 			// The TEXT specifier refers to the content of the message (or section), omitting the [RFC-2822] header.
 			// Non-empty section with no specifier (imap.EntireSpecifier) refers to section content without header.
 			response, err = structure.GetSectionContent(bodyReader, section.Path)
-		case section.Specifier == imap.MIMESpecifier:
+		case section.Specifier == imap.MIMESpecifier: // The MIME part specifier refers to the [MIME-IMB] header for this part.
-			// The MIME part specifier refers to the [MIME-IMB] header for this part.
 			fallthrough
 		case section.Specifier == imap.HeaderSpecifier:
 			header, err = structure.GetSectionHeader(section.Path)
 		default:
 			err = errors.New("Unknown specifier " + string(section.Specifier))
 		}
+
+		if err != nil {
+			return nil, err
+		}
 	}
 
-	if err != nil {
-		return
-	}
-
-	// Filter header. Options are: all fields, only selected fields, all fields except selected.
 	if header != nil {
-		// remove fields
+		response = filteredHeaderAsBytes(header, section)
-		if len(section.Fields) != 0 && section.NotFields {
-			for _, field := range section.Fields {
-				header.Del(field)
-			}
-		}
-
-		fields := make([]string, 0, len(header))
-		if len(section.Fields) == 0 || section.NotFields { // add all and sort
-			for f := range header {
-				fields = append(fields, f)
-			}
-			sort.Strings(fields)
-		} else { // add only requested (in requested order)
-			for _, f := range section.Fields {
-				fields = append(fields, textproto.CanonicalMIMEHeaderKey(f))
-			}
-		}
-
-		headerBuf := &bytes.Buffer{}
-		for _, canonical := range fields {
-			if values, ok := header[canonical]; !ok {
-				continue
-			} else {
-				for _, val := range values {
-					fmt.Fprintf(headerBuf, "%s: %s\r\n", canonical, val)
-				}
-			}
-		}
-		response = headerBuf.Bytes()
 	}
 
 	// Trim any output if requested.
-	literal = bytes.NewBuffer(section.ExtractPartial(response))
+	return bytes.NewBuffer(section.ExtractPartial(response)), nil
-	return literal, nil
 }
 
-func (im *imapMailbox) fetchMessage(m *pmapi.Message) (err error) {
+// filteredHeaderAsBytes filters the header fields by section fields and it
-	im.log.Trace("Fetching message")
+// returns the filtered fields as bytes.
-
+// Options are: all fields, only selected fields, all fields except selected.
-	complete, err := im.storeMailbox.FetchMessage(m.ID)
+func filteredHeaderAsBytes(header textproto.MIMEHeader, section *imap.BodySectionName) []byte {
-	if err != nil {
+	// remove fields
-		im.log.WithError(err).Error("Could not get message from store")
+	if len(section.Fields) != 0 && section.NotFields {
-		return
+		for _, field := range section.Fields {
-	}
+			header.Del(field)
-
-	*m = *complete.Message()
-
-	return
-}
-
-func (im *imapMailbox) writeMessageBody(w io.Writer, m *pmapi.Message) (err error) {
-	im.log.Trace("Writing message body")
-
-	if m.Body == "" {
-		im.log.Trace("While writing message body, noticed message body is null, need to fetch")
-		if err = im.fetchMessage(m); err != nil {
-			return
 		}
 	}
 
-	kr, err := im.user.client().KeyRingForAddressID(m.AddressID)
+	fields := make([]string, 0, len(header))
-	if err != nil {
+	if len(section.Fields) == 0 || section.NotFields { // add all and sort
-		return errors.Wrap(err, "failed to get keyring for address ID")
+		for f := range header {
-	}
+			fields = append(fields, f)
-
-	err = message.WriteBody(w, kr, m)
-	if err != nil {
-		if customMessageErr := message.CustomMessage(m, err, true); customMessageErr != nil {
-			im.log.WithError(customMessageErr).Warn("Failed to make custom message")
 		}
-		_, _ = io.WriteString(w, m.Body)
+		sort.Strings(fields)
-		err = nil
+	} else { // add only requested (in requested order)
-	}
+		for _, f := range section.Fields {
-
+			fields = append(fields, textproto.CanonicalMIMEHeaderKey(f))
-	return
-}
-
-func (im *imapMailbox) writeAttachmentBody(w io.Writer, m *pmapi.Message, att *pmapi.Attachment) (err error) {
-	// Retrieve encrypted attachment.
-	r, err := im.user.client().GetAttachment(att.ID)
-	if err != nil {
-		return
-	}
-	defer r.Close() //nolint[errcheck]
-
-	kr, err := im.user.client().KeyRingForAddressID(m.AddressID)
-	if err != nil {
-		return errors.Wrap(err, "failed to get keyring for address ID")
-	}
-
-	if err = message.WriteAttachmentBody(w, kr, m, att, r); err != nil {
-		// Returning an error here makes certain mail clients behave badly,
-		// trying to retrieve the message again and again.
-		im.log.Warn("Cannot write attachment body: ", err)
-		err = nil
-	}
-	return
-}
-
-func (im *imapMailbox) writeRelatedPart(p io.Writer, m *pmapi.Message, inlines []*pmapi.Attachment) (err error) {
-	related := multipart.NewWriter(p)
-
-	_ = related.SetBoundary(message.GetRelatedBoundary(m))
-
-	buf := &bytes.Buffer{}
-	if err = im.writeMessageBody(buf, m); err != nil {
-		return
-	}
-
-	// Write the body part.
-	h := message.GetBodyHeader(m)
-
-	if p, err = related.CreatePart(h); err != nil {
-		return
-	}
-
-	_, _ = buf.WriteTo(p)
-
-	for _, inline := range inlines {
-		buf = &bytes.Buffer{}
-		if err = im.writeAttachmentBody(buf, m, inline); err != nil {
-			return
 		}
+	}
 
-		h := message.GetAttachmentHeader(inline)
+	headerBuf := &bytes.Buffer{}
-		if p, err = related.CreatePart(h); err != nil {
+	for _, canonical := range fields {
-			return
+		if values, ok := header[canonical]; !ok {
+			continue
+		} else {
+			for _, val := range values {
+				fmt.Fprintf(headerBuf, "%s: %s\r\n", canonical, val)
+			}
 		}
-		_, _ = buf.WriteTo(p)
 	}
-
+	return headerBuf.Bytes()
-	_ = related.Close()
-	return nil
-}
-
-const (
-	noMultipart      = iota // only body
-	simpleMultipart         // body + attachment or inline
-	complexMultipart        // mixed, rfc822, alternatives, ...
-)
-
-func (im *imapMailbox) setMessageContentType(m *pmapi.Message) (multipartType int, err error) {
-	if m.MIMEType == "" {
-		err = fmt.Errorf("trying to set Content-Type without MIME TYPE")
-		return
-	}
-	// message.MIMEType can have just three values from our server:
-	// * `text/html` (refers to body type, but might contain attachments and inlines)
-	// * `text/plain` (refers to body type, but might contain attachments and inlines)
-	// * `multipart/mixed` (refers to external message with multipart structure)
-	// The proper header content fields must be set and saved to DB based MIMEType and content.
-	multipartType = noMultipart
-	if m.MIMEType == pmapi.ContentTypeMultipartMixed {
-		multipartType = complexMultipart
-	} else if m.NumAttachments != 0 {
-		multipartType = simpleMultipart
-	}
-
-	h := textproto.MIMEHeader(m.Header)
-	if multipartType == noMultipart {
-		message.SetBodyContentFields(&h, m)
-	} else {
-		h.Set("Content-Type",
-			fmt.Sprintf("%s; boundary=%s", "multipart/mixed", message.GetBoundary(m)),
-		)
-	}
-	m.Header = mail.Header(h)
-
-	return
 }
 
 // buildMessage from PM to IMAP.
-func (im *imapMailbox) buildMessage(m *pmapi.Message) (structure *message.BodyStructure, msgBody []byte, err error) {
+func (im *imapMailbox) buildMessage(m *pmapi.Message) (*message.BodyStructure, []byte, error) {
-	im.log.Trace("Building message")
+	body, err := im.builder.NewJobWithOptions(
-
+		context.Background(),
-	var errNoCache doNotCacheError
+		im.user.client(),
-
+		m.ID,
-	// If fetch or decryption fails we need to change the MIMEType (in customMessage).
+		message.JobOptions{
-	err = im.fetchMessage(m)
+			IgnoreDecryptionErrors: true, // Whether to ignore decryption errors and create a "custom message" instead.
+			SanitizeDate:           true, // Whether to replace all dates before 1970 with RFC822's birthdate.
+			AddInternalID:          true, // Whether to include MessageID as X-Pm-Internal-Id.
+			AddExternalID:          true, // Whether to include ExternalID as X-Pm-External-Id.
+			AddMessageDate:         true, // Whether to include message time as X-Pm-Date.
+			AddMessageIDReference:  true, // Whether to include the MessageID in References.
+		},
+	).GetResult()
 	if err != nil {
-		return
-	}
-
-	kr, err := im.user.client().KeyRingForAddressID(m.AddressID)
-	if err != nil {
-		err = errors.Wrap(err, "failed to get keyring for address ID")
-		return
-	}
-
-	errDecrypt := m.Decrypt(kr)
-
-	if errDecrypt != nil && errDecrypt != openpgperrors.ErrSignatureExpired {
-		errNoCache.add(errDecrypt)
-		if customMessageErr := message.CustomMessage(m, errDecrypt, true); customMessageErr != nil {
-			im.log.WithError(customMessageErr).Warn("Failed to make custom message")
-		}
-	}
-
-	// Inner function can fail even when message is decrypted.
-	// #1048 For example we have problem with double-encrypted messages
-	// which seems as still encrypted and we try them to decrypt again
-	// and that fails. For any building error is better to return custom
-	// message than error because it will not be fixed and users would
-	// get error message all the time and could not see some messages.
-	structure, msgBody, err = im.buildMessageInner(m, kr)
-	if err == pmapi.ErrAPINotReachable || err == pmapi.ErrInvalidToken || err == pmapi.ErrUpgradeApplication {
 		return nil, nil, err
-	} else if err != nil {
-		errNoCache.add(err)
-		if customMessageErr := message.CustomMessage(m, err, true); customMessageErr != nil {
-			im.log.WithError(customMessageErr).Warn("Failed to make custom message")
-		}
-		structure, msgBody, err = im.buildMessageInner(m, kr)
-		if err != nil {
-			return nil, nil, err
-		}
 	}
 
-	err = errNoCache.errorOrNil()
+	structure, err := message.NewBodyStructure(bytes.NewReader(body))
-
-	return structure, msgBody, err
-}
-
-func (im *imapMailbox) buildMessageInner(m *pmapi.Message, kr *crypto.KeyRing) (structure *message.BodyStructure, msgBody []byte, err error) { // nolint[funlen]
-	multipartType, err := im.setMessageContentType(m)
 	if err != nil {
-		return
+		return nil, nil, err
 	}
 
-	tmpBuf := &bytes.Buffer{}
+	return structure, body, nil
-	mainHeader := buildHeader(m)
-	if err = writeHeader(tmpBuf, mainHeader); err != nil {
-		return
-	}
-	_, _ = io.WriteString(tmpBuf, "\r\n")
-
-	switch multipartType {
-	case noMultipart:
-		err = message.WriteBody(tmpBuf, kr, m)
-		if err != nil {
-			return
-		}
-	case complexMultipart:
-		_, _ = io.WriteString(tmpBuf, "\r\n--"+message.GetBoundary(m)+"\r\n")
-		err = message.WriteBody(tmpBuf, kr, m)
-		if err != nil {
-			return
-		}
-		_, _ = io.WriteString(tmpBuf, "\r\n--"+message.GetBoundary(m)+"--\r\n")
-	case simpleMultipart:
-		atts, inlines := message.SeparateInlineAttachments(m)
-		mw := multipart.NewWriter(tmpBuf)
-		_ = mw.SetBoundary(message.GetBoundary(m))
-
-		var partWriter io.Writer
-
-		if len(inlines) > 0 {
-			relatedHeader := message.GetRelatedHeader(m)
-			if partWriter, err = mw.CreatePart(relatedHeader); err != nil {
-				return
-			}
-			_ = im.writeRelatedPart(partWriter, m, inlines)
-		} else {
-			buf := &bytes.Buffer{}
-			if err = im.writeMessageBody(buf, m); err != nil {
-				return
-			}
-
-			// Write the body part.
-			bodyHeader := message.GetBodyHeader(m)
-			if partWriter, err = mw.CreatePart(bodyHeader); err != nil {
-				return
-			}
-
-			_, _ = buf.WriteTo(partWriter)
-		}
-
-		// Write the attachments parts.
-		input := make([]interface{}, len(atts))
-		for i, att := range atts {
-			input[i] = att
-		}
-
-		processCallback := func(value interface{}) (interface{}, error) {
-			att := value.(*pmapi.Attachment)
-
-			buf := &bytes.Buffer{}
-			if err = im.writeAttachmentBody(buf, m, att); err != nil {
-				return nil, err
-			}
-			return buf, nil
-		}
-
-		collectCallback := func(idx int, value interface{}) error {
-			buf := value.(*bytes.Buffer)
-			defer buf.Reset()
-			att := atts[idx]
-
-			attachmentHeader := message.GetAttachmentHeader(att)
-			if partWriter, err = mw.CreatePart(attachmentHeader); err != nil {
-				return err
-			}
-
-			_, _ = buf.WriteTo(partWriter)
-			return nil
-		}
-
-		err = parallel.RunParallel(fetchAttachmentsWorkers, input, processCallback, collectCallback)
-		if err != nil {
-			return
-		}
-
-		_ = mw.Close()
-	default:
-		fmt.Fprintf(tmpBuf, "\r\n\r\nUknown multipart type: %d\r\n\r\n", multipartType)
-	}
-
-	// We need to copy buffer before building body structure.
-	msgBody = tmpBuf.Bytes()
-	structure, err = message.NewBodyStructure(tmpBuf)
-	if err != nil {
-		// NOTE: We need to set structure if it fails and is empty.
-		if structure == nil {
-			structure = &message.BodyStructure{}
-		}
-	}
-	return structure, msgBody, err
-}
-
-func buildHeader(msg *pmapi.Message) textproto.MIMEHeader {
-	header := message.GetHeader(msg)
-
-	msgTime := time.Unix(msg.Time, 0)
-
-	// Apple Mail crashes fetching messages with date older than 1970.
-	// There is no point having message older than RFC itself, it's not possible.
-	d, err := msg.Header.Date()
-	if err != nil || d.Before(rfc822Birthday) || msgTime.Before(rfc822Birthday) {
-		if err != nil || d.IsZero() {
-			header.Set("X-Original-Date", msgTime.Format(time.RFC1123Z))
-		} else {
-			header.Set("X-Original-Date", d.Format(time.RFC1123Z))
-		}
-		header.Set("Date", rfc822Birthday.Format(time.RFC1123Z))
-	}
-
-	return header
 }

internal/imap/mailbox_messages.go

@@ -38,6 +38,12 @@ import (
 // If the Backend implements Updater, it must notify the client immediately
 // via a message update.
 func (im *imapMailbox) UpdateMessagesFlags(uid bool, seqSet *imap.SeqSet, operation imap.FlagsOp, flags []string) error {
+	return im.logCommand(func() error {
+		return im.updateMessagesFlags(uid, seqSet, operation, flags)
+	}, "STORE", uid, seqSet, operation, flags)
+}
+
+func (im *imapMailbox) updateMessagesFlags(uid bool, seqSet *imap.SeqSet, operation imap.FlagsOp, flags []string) error {
 	log.WithFields(logrus.Fields{
 		"flags":     flags,
 		"operation": operation,
@@ -135,7 +141,7 @@ func (im *imapMailbox) addOrRemoveFlags(operation imap.FlagsOp, messageIDs, flag
 	for _, f := range flags {
 		switch f {
 		case imap.SeenFlag:
-			switch operation {
+			switch operation { //nolint[exhaustive] imap.SetFlags is processed by im.setFlags
 			case imap.AddFlags:
 				if err := im.storeMailbox.MarkMessagesRead(messageIDs); err != nil {
 					return err
@@ -146,7 +152,7 @@ func (im *imapMailbox) addOrRemoveFlags(operation imap.FlagsOp, messageIDs, flag
 				}
 			}
 		case imap.FlaggedFlag:
-			switch operation {
+			switch operation { //nolint[exhaustive] imap.SetFlag is processed by im.setFlags
 			case imap.AddFlags:
 				if err := im.storeMailbox.MarkMessagesStarred(messageIDs); err != nil {
 					return err
@@ -157,7 +163,7 @@ func (im *imapMailbox) addOrRemoveFlags(operation imap.FlagsOp, messageIDs, flag
 				}
 			}
 		case imap.DeletedFlag:
-			switch operation {
+			switch operation { //nolint[exhaustive] imap.SetFlag is processed by im.setFlags
 			case imap.AddFlags:
 				if err := im.storeMailbox.MarkMessagesDeleted(messageIDs); err != nil {
 					return err
@@ -176,7 +182,7 @@ func (im *imapMailbox) addOrRemoveFlags(operation imap.FlagsOp, messageIDs, flag
 			}
 
 			// Handle custom junk flags for Apple Mail and Thunderbird.
-			switch operation {
+			switch operation { //nolint[exhaustive] imap.SetFlag is processed by im.setFlags
 			// No label removal is necessary because Spam and Inbox are both exclusive labels so the backend
 			// will automatically take care of label removal.
 			case imap.AddFlags:
@@ -198,6 +204,12 @@ func (im *imapMailbox) addOrRemoveFlags(operation imap.FlagsOp, messageIDs, flag
 // destination mailbox. The flags and internal date of the message(s) SHOULD
 // be preserved, and the Recent flag SHOULD be set, in the copy.
 func (im *imapMailbox) CopyMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
+	return im.logCommand(func() error {
+		return im.copyMessages(uid, seqSet, targetLabel)
+	}, "COPY", uid, seqSet, targetLabel)
+}
+
+func (im *imapMailbox) copyMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
 	// Called from go-imap in goroutines - we need to handle panics for each function.
 	defer im.panicHandler.HandlePanic()
 
@@ -209,6 +221,12 @@ func (im *imapMailbox) CopyMessages(uid bool, seqSet *imap.SeqSet, targetLabel s
 // This should not be used until MOVE extension has option to send UIDPLUS
 // responses.
 func (im *imapMailbox) MoveMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
+	return im.logCommand(func() error {
+		return im.moveMessages(uid, seqSet, targetLabel)
+	}, "MOVE", uid, seqSet, targetLabel)
+}
+
+func (im *imapMailbox) moveMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
 	// Called from go-imap in goroutines - we need to handle panics for each function.
 	defer im.panicHandler.HandlePanic()
 
@@ -340,23 +358,29 @@ func (im *imapMailbox) SearchMessages(isUID bool, criteria *imap.SearchCriteria)
 				continue
 			}
 		}
+
+		// In order to speed up search it is not needed to check
+		// if IsFullHeaderCached.
+		header := storeMessage.GetHeader()
+
 		if !criteria.SentBefore.IsZero() || !criteria.SentSince.IsZero() {
-			if t, err := m.Header.Date(); err == nil && !t.IsZero() {
+			t, err := mail.Header(header).Date()
-				if !criteria.SentBefore.IsZero() {
+			if err != nil || t.IsZero() {
-					if truncated := criteria.SentBefore.Truncate(24 * time.Hour); t.Unix() > truncated.Unix() {
+				t = time.Unix(m.Time, 0)
-						continue
+			}
-					}
+			if !criteria.SentBefore.IsZero() {
+				if truncated := criteria.SentBefore.Truncate(24 * time.Hour); t.Unix() > truncated.Unix() {
+					continue
 				}
-				if !criteria.SentSince.IsZero() {
+			}
-					if truncated := criteria.SentSince.Truncate(24 * time.Hour); t.Unix() < truncated.Unix() {
+			if !criteria.SentSince.IsZero() {
-						continue
+				if truncated := criteria.SentSince.Truncate(24 * time.Hour); t.Unix() < truncated.Unix() {
-					}
+					continue
 				}
 			}
 		}
 
 		// Filter by headers.
-		header := message.GetHeader(m)
 		headerMatch := true
 		for criteriaKey, criteriaValues := range criteria.Header {
 			for _, criteriaValue := range criteriaValues {
@@ -364,6 +388,8 @@ func (im *imapMailbox) SearchMessages(isUID bool, criteria *imap.SearchCriteria)
 					continue
 				}
 				switch criteriaKey {
+				case "Subject":
+					headerMatch = strings.Contains(strings.ToLower(m.Subject), strings.ToLower(criteriaValue))
 				case "From":
 					headerMatch = addressMatch([]*mail.Address{m.Sender}, criteriaValue)
 				case "To":
@@ -463,7 +489,14 @@ func (im *imapMailbox) SearchMessages(isUID bool, criteria *imap.SearchCriteria)
 // 3501 section 6.4.5 for a list of items that can be requested.
 //
 // Messages must be sent to msgResponse. When the function returns, msgResponse must be closed.
-func (im *imapMailbox) ListMessages(isUID bool, seqSet *imap.SeqSet, items []imap.FetchItem, msgResponse chan<- *imap.Message) (err error) { //nolint[funlen]
+func (im *imapMailbox) ListMessages(isUID bool, seqSet *imap.SeqSet, items []imap.FetchItem, msgResponse chan<- *imap.Message) error {
+	msgBuildCountHistogram := newMsgBuildCountHistogram()
+	return im.logCommand(func() error {
+		return im.listMessages(isUID, seqSet, items, msgResponse, msgBuildCountHistogram)
+	}, "FETCH", isUID, seqSet, items, msgBuildCountHistogram)
+}
+
+func (im *imapMailbox) listMessages(isUID bool, seqSet *imap.SeqSet, items []imap.FetchItem, msgResponse chan<- *imap.Message, msgBuildCountHistogram *msgBuildCountHistogram) (err error) { //nolint[funlen]
 	defer func() {
 		close(msgResponse)
 		if err != nil {
@@ -511,7 +544,7 @@ func (im *imapMailbox) ListMessages(isUID bool, seqSet *imap.SeqSet, items []ima
 	}
 
 	processCallback := func(value interface{}) (interface{}, error) {
-		apiID := value.(string)
+		apiID := value.(string) //nolint[forcetypeassert] we want to panic here
 
 		storeMessage, err := im.storeMailbox.GetMessage(apiID)
 		if err != nil {
@@ -520,7 +553,7 @@ func (im *imapMailbox) ListMessages(isUID bool, seqSet *imap.SeqSet, items []ima
 			return nil, err
 		}
 
-		msg, err := im.getMessage(storeMessage, items)
+		msg, err := im.getMessage(storeMessage, items, msgBuildCountHistogram)
 		if err != nil {
 			err = fmt.Errorf("list message build: %v", err)
 			l.WithField("metaID", storeMessage.ID()).Error(err)
@@ -545,12 +578,12 @@ func (im *imapMailbox) ListMessages(isUID bool, seqSet *imap.SeqSet, items []ima
 	}
 
 	collectCallback := func(idx int, value interface{}) error {
-		msg := value.(*imap.Message)
+		msg := value.(*imap.Message) //nolint[forcetypeassert] we want to panic here
 		msgResponse <- msg
 		return nil
 	}
 
-	err = parallel.RunParallel(fetchMessagesWorkers, input, processCallback, collectCallback)
+	err = parallel.RunParallel(fetchWorkers, input, processCallback, collectCallback)
 	if err != nil {
 		return err
 	}

internal/imap/msg_build_counts.go

@@ -0,0 +1,65 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package imap
+
+import (
+	"fmt"
+	"sync"
+)
+
+// msgBuildCountHistogram is used to analyse and log the number of repetitive
+// downloads of requested messages per one fetch. The number of builds per each
+// messageID is stored in persistent database. The msgBuildCountHistogram will
+// take this number for each message in ongoing fetch and create histogram of
+// repeats.
+//
+// Example: During `fetch 1:300` there were
+// - 100 messages were downloaded first time
+// - 100 messages were downloaded second time
+// - 99 messages were downloaded 10th times
+// - 1 messages were downloaded 100th times.
+type msgBuildCountHistogram struct {
+	// Key represents how many times message was build.
+	// Value stores how many messages are build X times based on the key.
+	counts map[uint32]uint32
+	lock   sync.Locker
+}
+
+func newMsgBuildCountHistogram() *msgBuildCountHistogram {
+	return &msgBuildCountHistogram{
+		counts: map[uint32]uint32{},
+		lock:   &sync.Mutex{},
+	}
+}
+
+func (c *msgBuildCountHistogram) String() string {
+	res := ""
+	for nRebuild, counts := range c.counts {
+		if res != "" {
+			res += ", "
+		}
+		res += fmt.Sprintf("[%d]:%d", nRebuild, counts)
+	}
+	return res
+}
+
+func (c *msgBuildCountHistogram) add(nRebuild uint32) {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	c.counts[nRebuild]++
+}

internal/imap/server.go

@@ -28,6 +28,7 @@ import (
 
 	imapid "github.com/ProtonMail/go-imap-id"
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/internal/imap/id"
 	"github.com/ProtonMail/proton-bridge/internal/imap/uidplus"
@@ -39,6 +40,7 @@ import (
 	imapmove "github.com/emersion/go-imap-move"
 	imapquota "github.com/emersion/go-imap-quota"
 	imapunselect "github.com/emersion/go-imap-unselect"
+	"github.com/emersion/go-imap/backend"
 	imapserver "github.com/emersion/go-imap/server"
 	"github.com/emersion/go-sasl"
 	"github.com/sirupsen/logrus"
@@ -47,6 +49,7 @@ import (
 type imapServer struct {
 	panicHandler  panicHandler
 	server        *imapserver.Server
+	userAgent     *useragent.UserAgent
 	eventListener listener.Listener
 	debugClient   bool
 	debugServer   bool
@@ -55,7 +58,7 @@ type imapServer struct {
 }
 
 // NewIMAPServer constructs a new IMAP server configured with the given options.
-func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, port int, tls *tls.Config, imapBackend *imapBackend, eventListener listener.Listener) *imapServer { //nolint[golint]
+func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, port int, tls *tls.Config, imapBackend backend.Backend, userAgent *useragent.UserAgent, eventListener listener.Listener) *imapServer { // nolint[golint]
 	s := imapserver.New(imapBackend)
 	s.Addr = fmt.Sprintf("%v:%v", bridge.Host, port)
 	s.TLSConfig = tls
@@ -93,7 +96,7 @@ func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, por
 	s.Enable(
 		imapidle.NewExtension(),
 		imapmove.NewExtension(),
-		id.NewExtension(serverID, imapBackend.bridge),
+		id.NewExtension(serverID, userAgent),
 		imapquota.NewExtension(),
 		imapappendlimit.NewExtension(),
 		imapunselect.NewExtension(),
@@ -103,6 +106,7 @@ func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, por
 	server := &imapServer{
 		panicHandler:  panicHandler,
 		server:        s,
+		userAgent:     userAgent,
 		eventListener: eventListener,
 		debugClient:   debugClient,
 		debugServer:   debugServer,
@@ -144,9 +148,10 @@ func (s *imapServer) listenAndServe(retries int) {
 		return
 	}
 
-	err = s.server.Serve(&debugListener{
+	err = s.server.Serve(&connListener{
-		Listener: l,
+		Listener:  l,
-		server:   s,
+		server:    s,
+		userAgent: s.userAgent,
 	})
 	// Serve returns error every time, even after closing the server.
 	// User shouldn't be notified about error if server shouldn't be running,
@@ -233,18 +238,19 @@ func (s *imapServer) monitorDisconnectedUsers() {
 	}
 }
 
-// debugListener sets debug loggers on server containing fields with local
+// connListener sets debug loggers on server containing fields with local
 // and remote addresses right after new connection is accepted.
-type debugListener struct {
+type connListener struct {
 	net.Listener
 
-	server *imapServer
+	server    *imapServer
+	userAgent *useragent.UserAgent
 }
 
-func (dl *debugListener) Accept() (net.Conn, error) {
+func (l *connListener) Accept() (net.Conn, error) {
-	conn, err := dl.Listener.Accept()
+	conn, err := l.Listener.Accept()
 
-	if err == nil && (dl.server.debugServer || dl.server.debugClient) {
+	if err == nil && (l.server.debugServer || l.server.debugClient) {
 		debugLog := log
 		if addr := conn.LocalAddr(); addr != nil {
 			debugLog = debugLog.WithField("loc", addr.String())
@@ -254,14 +260,18 @@ func (dl *debugListener) Accept() (net.Conn, error) {
 		}
 
 		var localDebug, remoteDebug io.Writer
-		if dl.server.debugServer {
+		if l.server.debugServer {
 			localDebug = debugLog.WithField("pkg", "imap/server").WriterLevel(logrus.DebugLevel)
 		}
-		if dl.server.debugClient {
+		if l.server.debugClient {
 			remoteDebug = debugLog.WithField("pkg", "imap/client").WriterLevel(logrus.DebugLevel)
 		}
 
-		dl.server.server.Debug = imap.NewDebugWriter(localDebug, remoteDebug)
+		l.server.server.Debug = imap.NewDebugWriter(localDebug, remoteDebug)
+	}
+
+	if !l.userAgent.HasClient() {
+		l.userAgent.SetClient("UnknownClient", "0.0.1")
 	}
 
 	return conn, err

internal/imap/server_test.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 	"github.com/ProtonMail/proton-bridge/pkg/ports"
@@ -48,6 +49,7 @@ func TestIMAPServerTurnOffAndOnAgain(t *testing.T) {
 		panicHandler:  panicHandler,
 		server:        server,
 		eventListener: eventListener,
+		userAgent:     useragent.New(),
 	}
 	s.isRunning.Store(false)
 

internal/imap/store.go

@@ -20,6 +20,7 @@ package imap
 import (
 	"io"
 	"net/mail"
+	"net/textproto"
 
 	"github.com/ProtonMail/gopenpgp/v2/crypto"
 	"github.com/ProtonMail/proton-bridge/internal/imap/uidplus"
@@ -100,9 +101,12 @@ type storeMessageProvider interface {
 	IsMarkedDeleted() bool
 
 	SetSize(int64) error
-	SetContentTypeAndHeader(string, mail.Header) error
+	SetHeader([]byte) error
+	GetHeader() textproto.MIMEHeader
+	IsFullHeaderCached() bool
 	SetBodyStructure(*pkgMsg.BodyStructure) error
 	GetBodyStructure() (*pkgMsg.BodyStructure, error)
+	IncreaseBuildCount() (uint32, error)
 }
 
 type storeUserWrap struct {
@@ -122,7 +126,7 @@ func (s *storeUserWrap) GetAddress(addressID string) (storeAddressProvider, erro
 	if err != nil {
 		return nil, err
 	}
-	return newStoreAddressWrap(address), nil
+	return newStoreAddressWrap(address), nil //nolint[typecheck] missing methods are inherited
 }
 
 type storeAddressWrap struct {
@@ -136,7 +140,7 @@ func newStoreAddressWrap(address *store.Address) *storeAddressWrap {
 func (s *storeAddressWrap) ListMailboxes() []storeMailboxProvider {
 	mailboxes := []storeMailboxProvider{}
 	for _, mailbox := range s.Address.ListMailboxes() {
-		mailboxes = append(mailboxes, newStoreMailboxWrap(mailbox))
+		mailboxes = append(mailboxes, newStoreMailboxWrap(mailbox)) //nolint[typecheck] missing methods are inherited
 	}
 	return mailboxes
 }
@@ -146,7 +150,7 @@ func (s *storeAddressWrap) GetMailbox(name string) (storeMailboxProvider, error)
 	if err != nil {
 		return nil, err
 	}
-	return newStoreMailboxWrap(mailbox), nil
+	return newStoreMailboxWrap(mailbox), nil //nolint[typecheck] missing methods are inherited
 }
 
 type storeMailboxWrap struct {

internal/imap/uidplus/extension.go

@@ -33,7 +33,7 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-// Capability extension identifier
+// Capability extension identifier.
 const Capability = "UIDPLUS"
 
 const (
@@ -228,7 +228,9 @@ func getStatusResponseCopy(uidValidity uint32, sourceSeq, targetSeq *OrderedSeq)
 
 // CopyResponse prepares OK response with extended UID information about copied message.
 func CopyResponse(uidValidity uint32, sourceSeq, targetSeq *OrderedSeq) error {
-	return server.ErrStatusResp(getStatusResponseCopy(uidValidity, sourceSeq, targetSeq))
+	return &imap.ErrStatusResp{
+		Resp: getStatusResponseCopy(uidValidity, sourceSeq, targetSeq),
+	}
 }
 
 func getStatusResponseAppend(uidValidity uint32, targetSeq *OrderedSeq) *imap.StatusResp {
@@ -250,5 +252,7 @@ func getStatusResponseAppend(uidValidity uint32, targetSeq *OrderedSeq) *imap.St
 
 // AppendResponse prepares OK response with extended UID information about appended message.
 func AppendResponse(uidValidity uint32, targetSeq *OrderedSeq) error {
-	return server.ErrStatusResp(getStatusResponseAppend(uidValidity, targetSeq))
+	return &imap.ErrStatusResp{
+		Resp: getStatusResponseAppend(uidValidity, targetSeq),
+	}
 }

internal/imap/user.go

@@ -41,7 +41,22 @@ type imapUser struct {
 
 	currentAddressLowercase string
 
-	appendInProcess sync.WaitGroup
+	// Some clients, for example Outlook, do MOVE by STORE \Deleted, APPEND,
+	// EXPUNGE where APPEN and EXPUNGE can go in parallel. Usual IMAP servers
+	// do not deduplicate messages and this it's not an issue, but for APPEND
+	// for PM means just assigning label. That would cause to assign label and
+	// then delete the message, or in other words cause data loss.
+	// go-imap does not call CreateMessage till it gets the whole message from
+	// IMAP client, therefore with big message, simple wait for APPEND before
+	// performing EXPUNGE is not enough. There has to be two-way lock. Only
+	// that way even if EXPUNGE is called few ms before APPEND and message
+	// is deleted, APPEND will not just assing label but creates the message
+	// again.
+	// The issue is only when moving message from folder which is causing
+	// real removal, so Trash and Spam. Those only need to use the lock to
+	// not cause huge slow down as EXPUNGE is implicitly called also after
+	// UNSELECT, CLOSE, or LOGOUT.
+	appendExpungeLock sync.Mutex
 }
 
 // newIMAPUser returns struct implementing go-imap/user interface.
@@ -120,7 +135,7 @@ func (iu *imapUser) ListMailboxes(showOnlySubcribed bool) ([]goIMAPBackend.Mailb
 		if showOnlySubcribed && !iu.isSubscribed(storeMailbox.LabelID()) {
 			continue
 		}
-		mailbox := newIMAPMailbox(iu.panicHandler, iu, storeMailbox)
+		mailbox := newIMAPMailbox(iu.panicHandler, iu, storeMailbox, iu.backend.builder)
 		mailboxes = append(mailboxes, mailbox)
 	}
 
@@ -152,7 +167,7 @@ func (iu *imapUser) GetMailbox(name string) (mb goIMAPBackend.Mailbox, err error
 		return
 	}
 
-	return newIMAPMailbox(iu.panicHandler, iu, storeMailbox), nil
+	return newIMAPMailbox(iu.panicHandler, iu, storeMailbox, iu.backend.builder), nil
 }
 
 // CreateMailbox creates a new mailbox.
@@ -218,8 +233,9 @@ func (iu *imapUser) GetQuota(name string) (*imapquota.Status, error) {
 
 	resources := make(map[string][2]uint32)
 	var list [2]uint32
-	list[0] = uint32(usedSpace / 1000)
+	// Quota is "in units of 1024 octets" (or KB) and PM returns bytes.
-	list[1] = uint32(maxSpace / 1000)
+	list[0] = uint32(usedSpace / 1024)
+	list[1] = uint32(maxSpace / 1024)
 	resources[imapquota.ResourceStorage] = list
 	status := &imapquota.Status{
 		Name:      "",
@@ -250,15 +266,3 @@ func (iu *imapUser) CreateMessageLimit() *uint32 {
 	upload := uint32(maxUpload)
 	return &upload
 }
-
-func (iu *imapUser) appendStarted() {
-	iu.appendInProcess.Add(1)
-}
-
-func (iu *imapUser) appendFinished() {
-	iu.appendInProcess.Done()
-}
-
-func (iu *imapUser) waitForAppend() {
-	iu.appendInProcess.Wait()
-}

internal/importexport/credits.go

@@ -1,22 +0,0 @@
-// Copyright (c) 2021 Proton Technologies AG
-//
-// This file is part of ProtonMail Bridge.
-//
-// ProtonMail Bridge is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// ProtonMail Bridge is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
-
-// Code generated by ./credits.sh at Mon Feb 1 10:34:22 CET 2021. DO NOT EDIT.
-
-package importexport
-
-const Credits = "github.com/0xAX/notificator;github.com/Masterminds/semver/v3;github.com/ProtonMail/bcrypt;github.com/ProtonMail/crypto;github.com/ProtonMail/docker-credential-helpers;github.com/ProtonMail/go-autostart;github.com/ProtonMail/go-imap;github.com/ProtonMail/go-imap-id;github.com/ProtonMail/go-rfc5322;github.com/ProtonMail/go-vcard;github.com/ProtonMail/gopenpgp/v2;github.com/PuerkitoBio/goquery;github.com/abiosoft/ishell;github.com/abiosoft/readline;github.com/allan-simon/go-singleinstance;github.com/chzyer/logex;github.com/chzyer/test;github.com/cucumber/godog;github.com/docker/docker-credential-helpers;github.com/emersion/go-imap;github.com/emersion/go-imap-appendlimit;github.com/emersion/go-imap-idle;github.com/emersion/go-imap-move;github.com/emersion/go-imap-quota;github.com/emersion/go-imap-unselect;github.com/emersion/go-mbox;github.com/emersion/go-message;github.com/emersion/go-sasl;github.com/emersion/go-smtp;github.com/emersion/go-textwrapper;github.com/emersion/go-vcard;github.com/fatih/color;github.com/flynn-archive/go-shlex;github.com/getsentry/sentry-go;github.com/go-resty/resty/v2;github.com/golang/mock;github.com/google/go-cmp;github.com/google/uuid;github.com/gopherjs/gopherjs;github.com/hashicorp/go-multierror;github.com/jameskeane/bcrypt;github.com/jaytaylor/html2text;github.com/keybase/go-keychain;github.com/logrusorgru/aurora;github.com/mattn/go-runewidth;github.com/miekg/dns;github.com/nsf/jsondiff;github.com/olekukonko/tablewriter;github.com/pkg/errors;github.com/sirupsen/logrus;github.com/skratchdot/open-golang;github.com/ssor/bom;github.com/stretchr/testify;github.com/therecipe/qt;github.com/urfave/cli/v2;github.com/vmihailenco/msgpack/v5;go.etcd.io/bbolt;golang.org/x/crypto;golang.org/x/net;golang.org/x/text;;Font Awesome 4.7.0;;Qt 5.13 by Qt group;"

internal/importexport/importexport.go

@@ -88,7 +88,7 @@ func (ie *ImportExport) ReportBug(osType, osVersion, description, accountName, a
 	return nil
 }
 
-// ReportFile submits import report file
+// ReportFile submits import report file.
 func (ie *ImportExport) ReportFile(osType, osVersion, accountName, address string, logdata []byte) error {
 	c := ie.clientManager.GetAnonymousClient()
 	defer c.Logout()
@@ -118,9 +118,9 @@ func (ie *ImportExport) ReportFile(osType, osVersion, accountName, address strin
 }
 
 // GetLocalImporter returns transferrer from local EML or MBOX structure to ProtonMail account.
-func (ie *ImportExport) GetLocalImporter(address, path string) (*transfer.Transfer, error) {
+func (ie *ImportExport) GetLocalImporter(username, address, path string) (*transfer.Transfer, error) {
 	source := transfer.NewLocalProvider(path)
-	target, err := ie.getPMAPIProvider(address)
+	target, err := ie.getPMAPIProvider(username, address)
 	if err != nil {
 		return nil, err
 	}
@@ -132,12 +132,12 @@ func (ie *ImportExport) GetLocalImporter(address, path string) (*transfer.Transf
 }
 
 // GetRemoteImporter returns transferrer from remote IMAP to ProtonMail account.
-func (ie *ImportExport) GetRemoteImporter(address, username, password, host, port string) (*transfer.Transfer, error) {
+func (ie *ImportExport) GetRemoteImporter(username, address, remoteUsername, remotePassword, host, port string) (*transfer.Transfer, error) {
-	source, err := transfer.NewIMAPProvider(username, password, host, port)
+	source, err := transfer.NewIMAPProvider(remoteUsername, remotePassword, host, port)
 	if err != nil {
 		return nil, err
 	}
-	target, err := ie.getPMAPIProvider(address)
+	target, err := ie.getPMAPIProvider(username, address)
 	if err != nil {
 		return nil, err
 	}
@@ -149,8 +149,8 @@ func (ie *ImportExport) GetRemoteImporter(address, username, password, host, por
 }
 
 // GetEMLExporter returns transferrer from ProtonMail account to local EML structure.
-func (ie *ImportExport) GetEMLExporter(address, path string) (*transfer.Transfer, error) {
+func (ie *ImportExport) GetEMLExporter(username, address, path string) (*transfer.Transfer, error) {
-	source, err := ie.getPMAPIProvider(address)
+	source, err := ie.getPMAPIProvider(username, address)
 	if err != nil {
 		return nil, err
 	}
@@ -163,8 +163,8 @@ func (ie *ImportExport) GetEMLExporter(address, path string) (*transfer.Transfer
 }
 
 // GetMBOXExporter returns transferrer from ProtonMail account to local MBOX structure.
-func (ie *ImportExport) GetMBOXExporter(address, path string) (*transfer.Transfer, error) {
+func (ie *ImportExport) GetMBOXExporter(username, address, path string) (*transfer.Transfer, error) {
-	source, err := ie.getPMAPIProvider(address)
+	source, err := ie.getPMAPIProvider(username, address)
 	if err != nil {
 		return nil, err
 	}
@@ -176,8 +176,8 @@ func (ie *ImportExport) GetMBOXExporter(address, path string) (*transfer.Transfe
 	return transfer.New(ie.panicHandler, newExportMetricsManager(ie), logsPath, ie.cache.GetTransferDir(), source, target)
 }
 
-func (ie *ImportExport) getPMAPIProvider(address string) (*transfer.PMAPIProvider, error) {
+func (ie *ImportExport) getPMAPIProvider(username, address string) (*transfer.PMAPIProvider, error) {
-	user, err := ie.Users.GetUser(address)
+	user, err := ie.Users.GetUser(username)
 	if err != nil {
 		return nil, err
 	}

internal/locations/locations.go

@@ -32,9 +32,9 @@ import (
 // On linux:
 // - settings: ~/.config/protonmail/<app>
 // - logs: ~/.cache/protonmail/<app>/logs
-// - cache: ~/.cache/protonmail/<app>/cache
+// - cache: ~/.config/protonmail/<app>/cache
-// - updates: ~/.cache/protonmail/<app>/updates
+// - updates: ~/.config/protonmail/<app>/updates
-// - lockfile: ~/.cache/protonmail/<app>/<app>.lock
+// - lockfile: ~/.cache/protonmail/<app>/<app>.lock .
 type Locations struct {
 	userConfig, userCache string
 	configName            string
@@ -129,7 +129,7 @@ func (l *Locations) ProvideLogsPath() (string, error) {
 	return l.getLogsPath(), nil
 }
 
-// ProvideCachePath returns a location for user cache dirs (e.g. ~/.cache/<company>/<app>/cache).
+// ProvideCachePath returns a location for user cache dirs (e.g. ~/.config/<company>/<app>/cache).
 // It creates it if it doesn't already exist.
 func (l *Locations) ProvideCachePath() (string, error) {
 	if err := os.MkdirAll(l.getCachePath(), 0700); err != nil {
@@ -139,6 +139,11 @@ func (l *Locations) ProvideCachePath() (string, error) {
 	return l.getCachePath(), nil
 }
 
+// GetOldCachePath returns a former location for user cache dirs used for migration scripts only.
+func (l *Locations) GetOldCachePath() string {
+	return filepath.Join(l.userCache, "cache")
+}
+
 // ProvideUpdatesPath returns a location for update files (e.g. ~/.cache/<company>/<app>/updates).
 // It creates it if it doesn't already exist.
 func (l *Locations) ProvideUpdatesPath() (string, error) {
@@ -149,6 +154,16 @@ func (l *Locations) ProvideUpdatesPath() (string, error) {
 	return l.getUpdatesPath(), nil
 }
 
+// GetUpdatesPath returns a new location for update files used for migration scripts only.
+func (l *Locations) GetUpdatesPath() string {
+	return l.getUpdatesPath()
+}
+
+// GetOldUpdatesPath returns a former location for update files used for migration scripts only.
+func (l *Locations) GetOldUpdatesPath() string {
+	return filepath.Join(l.userCache, "updates")
+}
+
 func (l *Locations) getSettingsPath() string {
 	return l.userConfig
 }
@@ -158,11 +173,33 @@ func (l *Locations) getLogsPath() string {
 }
 
 func (l *Locations) getCachePath() string {
-	return filepath.Join(l.userCache, "cache")
+	// Bridge cache is not a typical cache which can be deleted with only
+	// downside that the app has to download everything again.
+	// Cache for bridge is database with IMAP UIDs and UIDVALIDITY, and also
+	// other IMAP setup. Deleting such data leads to either re-sync of client,
+	// or mix of headers and bodies. Both is caused because of need of re-sync
+	// between Bridge and API which will happen in different order than before.
+	// In the first case, UIDVALIDITY is also changed and causes the better
+	// outcome to "just" re-sync everything; in the later, UIDVALIDITY stays
+	// the same, causing the client to not re-sync but UIDs in the client does
+	// not match UIDs in Bridge.
+	// Because users might use tools to regularly clear caches, Bridge cache
+	// cannot be located in a standard cache folder.
+	return filepath.Join(l.userConfig, "cache")
 }
 
 func (l *Locations) getUpdatesPath() string {
-	return filepath.Join(l.userCache, "updates")
+	// In order to properly update Bridge 1.6.X and higher we need to
+	// change the launcher first. Since this is not part of automatic
+	// updates the migration must wait until manual update. Until that
+	// we need to keep old path.
+	if l.configName == "bridge" {
+		return l.GetOldUpdatesPath()
+	}
+
+	// Users might use tools to regularly clear caches, which would mean always
+	// removing updates, therefore Bridge updates have to be somewhere else.
+	return filepath.Join(l.userConfig, "updates")
 }
 
 // Clear removes everything except the lock and update files.

internal/locations/locations_test.go

@@ -45,7 +45,8 @@ func TestClearRemovesEverythingExceptLockAndUpdateFiles(t *testing.T) {
 	assert.NoError(t, l.Clear())
 
 	assert.FileExists(t, l.GetLockFile())
-	assert.NoDirExists(t, l.getSettingsPath())
+	assert.DirExists(t, l.getSettingsPath())
+	assert.NoFileExists(t, filepath.Join(l.getSettingsPath(), "prefs.json"))
 	assert.NoDirExists(t, l.getLogsPath())
 	assert.NoDirExists(t, l.getCachePath())
 	assert.DirExists(t, l.getUpdatesPath())
@@ -58,6 +59,7 @@ func TestClearUpdateFiles(t *testing.T) {
 
 	assert.FileExists(t, l.GetLockFile())
 	assert.DirExists(t, l.getSettingsPath())
+	assert.FileExists(t, filepath.Join(l.getSettingsPath(), "prefs.json"))
 	assert.DirExists(t, l.getLogsPath())
 	assert.DirExists(t, l.getCachePath())
 	assert.NoDirExists(t, l.getUpdatesPath())
@@ -75,6 +77,7 @@ func TestCleanLeavesStandardLocationsUntouched(t *testing.T) {
 
 	assert.FileExists(t, l.GetLockFile())
 	assert.DirExists(t, l.getSettingsPath())
+	assert.FileExists(t, filepath.Join(l.getSettingsPath(), "prefs.json"))
 	assert.DirExists(t, l.getLogsPath())
 	assert.FileExists(t, filepath.Join(l.getLogsPath(), "log1.txt"))
 	assert.FileExists(t, filepath.Join(l.getLogsPath(), "log2.txt"))
@@ -138,6 +141,9 @@ func newTestLocations(t *testing.T) *Locations {
 	require.NoError(t, err)
 	require.DirExists(t, settings)
 
+	createFilesInDir(t, settings, "prefs.json")
+	require.FileExists(t, filepath.Join(settings, "prefs.json"))
+
 	logs, err := l.ProvideLogsPath()
 	require.NoError(t, err)
 	require.DirExists(t, logs)

internal/logging/crash.go

@@ -34,7 +34,7 @@ func DumpStackTrace(logsPath string) crash.RecoveryAction {
 	return func(r interface{}) error {
 		file := filepath.Join(logsPath, getStackTraceName(constants.Version, constants.Revision))
 
-		f, err := os.OpenFile(file, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0600)
+		f, err := os.OpenFile(filepath.Clean(file), os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0600)
 		if err != nil {
 			return err
 		}

internal/logging/logging.go

@@ -42,6 +42,7 @@ const (
 
 func Init(logsPath string) error {
 	logrus.SetFormatter(&logrus.TextFormatter{
+		ForceColors:     true,
 		FullTimestamp:   true,
 		TimestampFormat: time.StampMilli,
 	})
@@ -69,6 +70,10 @@ func Init(logsPath string) error {
 	return nil
 }
 
+// SetLevel will change the level of logging and in case of Debug or Trace
+// level it will also prevent from writing to file. Setting level to Info or
+// higher will not set writing to file again if it was previously cancelled by
+// Debug or Trace.
 func SetLevel(level string) {
 	if lvl, err := logrus.ParseLevel(level); err == nil {
 		logrus.SetLevel(lvl)