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_settings.go

@@ -0,0 +1,151 @@
+// 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 (
+	"time"
+
+	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/frontend/clientconfig"
+	"github.com/ProtonMail/proton-bridge/pkg/keychain"
+	"github.com/ProtonMail/proton-bridge/pkg/ports"
+)
+
+func (f *FrontendQt) setIsDiskCacheEnabled() {
+	//TODO
+}
+
+func (f *FrontendQt) setDiskCachePath() {
+	//TODO
+}
+
+func (f *FrontendQt) changeLocalCache(enableDiskCache bool, diskCachePath string) {
+	//TODO
+}
+
+func (f *FrontendQt) setIsAutostartOn() {
+	f.qml.SetIsAutostartOn(f.autostart.IsEnabled())
+}
+
+func (f *FrontendQt) toggleAutostart(makeItEnabled bool) {
+	defer f.qml.ToggleAutostartFinished()
+	if makeItEnabled == f.autostart.IsEnabled() {
+		f.setIsAutostartOn()
+		return
+	}
+
+	var err error
+	if makeItEnabled {
+		err = f.autostart.Enable()
+	} else {
+		err = f.autostart.Disable()
+	}
+	f.setIsAutostartOn()
+
+	if err != nil {
+		f.log.
+			WithField("makeItEnabled", makeItEnabled).
+			WithField("isEnabled", f.qml.IsAutostartOn()).
+			WithError(err).
+			Error("Autostart change failed")
+	}
+}
+
+func (f *FrontendQt) toggleDoH(makeItEnabled bool) {
+	if f.settings.GetBool(settings.AllowProxyKey) == makeItEnabled {
+		f.qml.SetIsDoHEnabled(makeItEnabled)
+		return
+	}
+	f.settings.SetBool(settings.AllowProxyKey, makeItEnabled)
+	f.restart()
+}
+
+func (f *FrontendQt) toggleUseSSLforSMTP(makeItEnabled bool) {
+	if f.settings.GetBool(settings.SMTPSSLKey) == makeItEnabled {
+		f.qml.SetUseSSLforSMTP(makeItEnabled)
+		return
+	}
+	f.settings.SetBool(settings.SMTPPortKey, makeItEnabled)
+	f.restart()
+}
+
+func (f *FrontendQt) changePorts(imapPort, smtpPort int) {
+	f.settings.SetInt(settings.IMAPPortKey, imapPort)
+	f.settings.SetInt(settings.SMTPPortKey, smtpPort)
+	f.restart()
+}
+
+func (f *FrontendQt) isPortFree(port int) bool {
+	return ports.IsPortFree(port)
+}
+
+func (f *FrontendQt) configureAppleMail(userID, address string) {
+	user, err := f.bridge.GetUser(userID)
+	if err != nil {
+		f.log.WithField("userID", userID).Error("Cannot configure AppleMail for user")
+		return
+	}
+
+	needRestart, err := clientconfig.ConfigureAppleMail(user, address, f.settings)
+	if err != nil {
+		f.log.WithError(err).Error("Apple Mail config failed")
+	}
+
+	if needRestart {
+		// There is delay needed for external window to open
+		time.Sleep(2 * time.Second)
+		f.restart()
+	}
+}
+
+func (f *FrontendQt) triggerReset() {
+	defer f.qml.ResetFinished()
+	//TODO
+	f.restart()
+}
+
+func (f *FrontendQt) setKeychain() {
+	availableKeychain := []string{}
+	for chain := range keychain.Helpers {
+		availableKeychain = append(availableKeychain, chain)
+	}
+	f.qml.SetAvailableKeychain(availableKeychain)
+	f.qml.SetSelectedKeychain(f.bridge.GetKeychainApp())
+}
+
+func (f *FrontendQt) selectKeychain(wantKeychain string) {
+	if f.bridge.GetKeychainApp() == wantKeychain {
+		return
+	}
+
+	f.bridge.SetKeychainApp(wantKeychain)
+	f.restart()
+}
+
+func (f *FrontendQt) restart() {
+	f.log.Info("Restarting bridge")
+	f.restarter.SetToRestart()
+	f.app.Exit(0)
+}
+
+func (f *FrontendQt) quit() {
+	f.log.Warn("Your wish is my command.. I quit!")
+	f.app.Exit(0)
+}