GODT-1554 / 1555: Implement gRPC go service and Qt 5 frontend C++ app.

WIP: updates

WIP: cache on disk and autostart.

WIP: mail, keychain and more.

WIP: updated grpc version in go mod file.

WIP: user list.

WIP: RPC service placeholder

WIP: test C++ RPC client skeleton.

Other: missing license script update.

WIP: use Qt test framework.

WIP: test for app and login calls.

WIP: test for update & cache on disk calls.

WIP: tests for mail settings calls.

WIP: all client tests.

WIP: linter fixes.

WIP: fix missing license link.

WIP: update dependency_license script for gRPC and protobuf.

WIP: removed unused file.

WIP: app & login event streaming tests.

WIP: update event stream tests.

WIP: completed event streaming tests.

GODT-1554: qt C++ frontend skeleton.

WIP: C++ backend declaration.

wip: started drafting user model.

WIP: users. not functional.

WIP: invokable methods

WIP: Exception class + backend 'injection' into QML.

WIP: switch to VCPKG to ease multi-arch compilation,  C++ RPC client skeleton.

WIP: Renaming and reorganisation

WIP:introduced new 'grpc' go frontend.

WIP: Worker & Oveerseer for thread management.

WIP: added log to C++ app.

WIP: event stream architecture on Go side.

WIP: event parsing and streamer stopping.

WIP: Moved grpc to frontend subfolder + use vcpkg for gRPC and protobuf.

WIP: windows building ok

WIP: wired a few messages

WIP: more wiring.

WIP: Fixed imports after rebase on top of devel.

WIP: wired some bool and string properties.

WIP: more properties.

WIP: wired cache on disk stuff

WIP: connect event watcher.

WIP: login

WIP: fix showSplashScreen

WIP: Wired login calls.

WIP: user list.

WIP: Refactored main().

WIP: User retrieval .

WIP: no shared pointer in user model.

WIP: fixed user count.

WIP: cached goos.

WIP: Wired autostart

WIP: beta channel toggle wired.

WIP: User removal

WIP: wired theme

WIP: implemented configure apple mail.

WIP: split mode.

WIP: fixed user updates.

WIP: fixed Quit from tray icon

WIP: wired CurrentEmailClient

WIP: wired UseSSLForSMTP

WIP: wired change ports .

WIP: wired DoH. .

WIP: wired keychain calls.

WIP: wired autoupdate option.

WIP: QML Backend clean-up.

WIP: cleanup.

WIP: moved user related files in subfolder. .

WIP: User are managed using smart pointers.

WIP: cleanup.

WIP: more cleanup.

WIP: mail events forwarding

WIP: code inspection tweaks from CLion.

WIP: moved QML, cleanup, and missing copyright notices.

WIP: Backend is not QMLBackend.

Other: fixed issues reported by Leander. [skip ci]

internal/frontend/grpc/utils.go

@@ -0,0 +1,73 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail 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.
+//
+// Proton Mail 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 Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+package grpc
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/ProtonMail/proton-bridge/v2/internal/frontend/types"
+)
+
+var (
+	reMultiSpaces     = regexp.MustCompile(`\s{2,}`)
+	reStartWithSymbol = regexp.MustCompile(`^[.,/#!$@%^&*;:{}=\-_` + "`" + `~()]`)
+)
+
+// getInitials based on webapp implementation:
+// https://github.com/ProtonMail/WebClients/blob/55d96a8b4afaaa4372fc5f1ef34953f2070fd7ec/packages/shared/lib/helpers/string.ts#L145
+func getInitials(fullName string) string {
+	words := strings.Split(
+		reMultiSpaces.ReplaceAllString(fullName, " "),
+		" ",
+	)
+
+	n := 0
+	for _, word := range words {
+		if !reStartWithSymbol.MatchString(word) {
+			words[n] = word
+			n++
+		}
+	}
+
+	if n == 0 {
+		return "?"
+	}
+
+	initials := words[0][0:1]
+	if n != 1 {
+		initials += words[n-1][0:1]
+	}
+	return strings.ToUpper(initials)
+}
+
+// grpcUserFromBridge converts a bridge user to a gRPC user.
+func grpcUserFromBridge(user types.User) *User {
+	return &User{
+		Id:             user.ID(),
+		Username:       user.Username(),
+		AvatarText:     getInitials(user.Username()),
+		LoggedIn:       user.IsConnected(),
+		SplitMode:      user.IsCombinedAddressMode(),
+		SetupGuideSeen: true, // users listed have already seen the setup guide.
+		UsedBytes:      user.UsedBytes(),
+		TotalBytes:     user.TotalBytes(),
+		Password:       user.GetBridgePassword(),
+		Addresses:      user.GetAddresses(),
+	}
+}