GODT-22: Frontend-backend

- GODT-1246 Implement settings view.
- GODT-1257 GODT-1246: Account and Help view
- GODT-1298: Minimal working build (panics)
- GODT-1298: loading QML (needs Popup window)
- GODT-1298: WARN: Adding PopupWindow not possible!
    In therecipe qt the `quickwidgets` classes are within `quick` module, but
    forgot to add library and include paths into cgo flags. Therefore
    compilation fails and it would be hard to patch therecipe in order to
    fix it.

    I am not sure if rewrite PopupWindow into go would make any difference,
    therefore I decided to use normal QML Window without borders.
- GODT-1298: Rework status window, add backend props, slots and signals.
- GODT-1298: Users
- GODT-1298: Login
- GODT-1298: WIP Help and bug report
- GODT-1178: MacOS dock icon control
- GODT-1298: Help, bug report, update and events
- GODT-1298: Apple Mail config and Settings (without cache on disk)

internal/frontend/qt/frontend_updates.go

@@ -0,0 +1,130 @@
+// 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_qt
+
+package qt
+
+import (
+	"sync"
+
+	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/updater"
+)
+
+var checkingUpdates = sync.Mutex{}
+
+func (f *FrontendQt) checkUpdates() error {
+	version, err := f.updater.Check()
+	if err != nil {
+		return err
+	}
+
+	f.SetVersion(version)
+	return nil
+}
+
+func (f *FrontendQt) checkUpdatesAndNotify(isRequestFromUser bool) {
+	checkingUpdates.Lock()
+	defer checkingUpdates.Lock()
+	defer f.qml.CheckUpdatesFinished()
+
+	if err := f.checkUpdates(); err != nil {
+		f.log.WithError(err).Error("An error occurred while checking updates")
+		if isRequestFromUser {
+			f.qml.UpdateManualError()
+		}
+		return
+	}
+
+	if !f.updater.IsUpdateApplicable(f.newVersionInfo) {
+		f.log.Debug("No need to update")
+		if isRequestFromUser {
+			f.qml.UpdateIsLatestVersion()
+		}
+		return
+	}
+
+	if !f.updater.CanInstall(f.newVersionInfo) {
+		f.log.Debug("A manual update is required")
+		f.qml.UpdateManualReady(f.newVersionInfo.Version.String())
+		return
+	}
+}
+
+func (f *FrontendQt) updateForce() {
+	checkingUpdates.Lock()
+	defer checkingUpdates.Lock()
+
+	version := ""
+	if err := f.checkUpdates(); err == nil {
+		version = f.newVersionInfo.Version.String()
+	}
+
+	f.qml.UpdateForce(version)
+}
+
+func (f *FrontendQt) setIsAutomaticUpdateOn() {
+	f.qml.SetIsAutomaticUpdateOn(f.settings.GetBool(settings.AutoUpdateKey))
+}
+
+func (f *FrontendQt) toggleAutomaticUpdate(makeItEnabled bool) {
+	f.qml.SetIsAutomaticUpdateOn(makeItEnabled)
+	isEnabled := f.settings.GetBool(settings.AutoUpdateKey)
+	if makeItEnabled == isEnabled {
+		return
+	}
+
+	f.settings.SetBool(settings.AutoUpdateKey, makeItEnabled)
+
+	f.checkUpdatesAndNotify(false)
+}
+
+func (f *FrontendQt) setIsBetaEnabled() {
+	channel := f.bridge.GetUpdateChannel()
+	f.qml.SetIsBetaEnabled(channel == updater.EarlyChannel)
+}
+
+func (f *FrontendQt) toggleBeta(makeItEnabled bool) {
+	channel := f.bridge.GetUpdateChannel()
+
+	if makeItEnabled == (channel == updater.EarlyChannel) {
+		f.qml.SetIsBetaEnabled(makeItEnabled)
+		return
+	}
+
+	channel = updater.StableChannel
+	if makeItEnabled {
+		channel = updater.EarlyChannel
+	}
+
+	needRestart, err := f.bridge.SetUpdateChannel(channel)
+	f.setIsBetaEnabled()
+
+	if err != nil {
+		f.log.WithError(err).Warn("Switching udpate channel failed.")
+		f.qml.UpdateManualError()
+		return
+	}
+
+	if needRestart {
+		f.restart()
+		return
+	}
+
+	f.checkUpdatesAndNotify(false)
+}