License button to open LICENSE file

internal/frontend/qml/BridgeUI/HelpView.qml

@@ -102,7 +102,7 @@ Item {
             Row {
                 anchors.left : parent.left
 
-                Rectangle { height: Style.dialog.spacing; width: (wrapper.width- credits.width - release.width - sepaCreditsRelease.width)/2; color: "transparent"}
+                Rectangle { height: Style.dialog.spacing; width: (wrapper.width - credits.width - licenseFile.width - release.width - sepaCreditsRelease.width)/2; color: "transparent"}
 
                 ClickIconText {
                     id:credits
@@ -114,6 +114,20 @@ Item {
                     onClicked     : winMain.dialogCredits.show()
                 }
 
+                Rectangle {id: sepaLicenseFile ; height: Style.dialog.spacing; width: Style.main.dummy; color: "transparent"}
+
+                ClickIconText {
+                    id:licenseFile
+                    iconText      : ""
+                    text          : qsTr("License", "link to click on to view license file")
+                    textColor     : Style.main.textDisabled
+                    fontSize      : Style.main.fontSize
+                    textUnderline : true
+                    onClicked     : {
+                        go.openLicenseFile()
+                    }
+                }
+
                 Rectangle {id: sepaCreditsRelease ; height: Style.dialog.spacing; width: Style.main.dummy; color: "transparent"}
 
                 ClickIconText {

internal/frontend/qml/ImportExportUI/HelpView.qml

@@ -106,6 +106,20 @@ Item {
                     }
                 }
 
+                Text {
+                    id: licenseFile
+                    text  : qsTr("License", "link to click on to open license file")
+                    color : Style.main.textDisabled
+                    font.pointSize: Style.main.fontSize * Style.pt
+                    font.underline: true
+                    MouseArea {
+                        anchors.fill: parent
+                        onClicked : {
+                        go.openLicenseFile()
+                        }
+                        cursorShape: Qt.PointingHandCursor
+                    }
+                }
 
                 Text {
                     id: releaseNotes

internal/frontend/qt-ie/frontend.go

@@ -433,6 +433,10 @@ func (f *FrontendQt) resetSource() {
 	}
 }
 
+func (f *FrontendQt) openLicenseFile() {
+	go open.Run(f.config.GetLicenseFilePath())
+}
+
 // getLocalVersionInfo is identical to bridge.
 func (f *FrontendQt) getLocalVersionInfo() {
 	defer f.Qml.ProcessFinished()

internal/frontend/qt-ie/ui.go

@@ -73,6 +73,7 @@ type GoQMLInterface struct {
 	_ func(okay bool)        `signal:"importStructuresLoadFinished"`
 	_ func()                 `signal:"openManual"`
 	_ func(showMessage bool) `signal:"runCheckVersion"`
+	_ func()                 `slot:"openLicenseFile"`
 	_ func()                 `slot:"getLocalVersionInfo"`
 	_ func()                 `slot:"loadImportReports"`
 
@@ -167,6 +168,7 @@ func (s *GoQMLInterface) SetFrontend(f *FrontendQt) {
 	s.SetIsRestarting(false)
 	s.SetProgramTitle(f.programName)
 
+	s.ConnectOpenLicenseFile(f.openLicenseFile)
 	s.ConnectGetLocalVersionInfo(f.getLocalVersionInfo)
 	s.ConnectIsNewVersionAvailable(f.isNewVersionAvailable)
 	s.ConnectGetBackendVersion(func() string {

internal/frontend/qt/frontend.go

@@ -415,6 +415,10 @@ func (s *FrontendQt) isNewVersionAvailable(showMessage bool) {
 	}()
 }
 
+func (s *FrontendQt) openLicenseFile() {
+	go open.Run(s.config.GetLicenseFilePath())
+}
+
 func (s *FrontendQt) getLocalVersionInfo() {
 	defer s.Qml.ProcessFinished()
 	localVersion := s.updates.GetLocalVersion()

internal/frontend/qt/ui.go

@@ -91,6 +91,7 @@ type GoQMLInterface struct {
 	_ func() `slot:"errorSystray"`
 	_ func() `slot:"normalSystray"`
 
+	_ func()                                                   `slot:"openLicenseFile"`
 	_ func()                                                   `slot:"getLocalVersionInfo"`
 	_ func(showMessage bool)                                   `slot:"isNewVersionAvailable"`
 	_ func() string                                            `slot:"getBackendVersion"`
@@ -152,6 +153,7 @@ func (s *GoQMLInterface) SetFrontend(f *FrontendQt) {
 	s.ConnectClearCache(f.clearCache)
 	s.ConnectClearKeychain(f.clearKeychain)
 
+	s.ConnectOpenLicenseFile(f.openLicenseFile)
 	s.ConnectGetLocalVersionInfo(f.getLocalVersionInfo)
 	s.ConnectIsNewVersionAvailable(f.isNewVersionAvailable)
 	s.ConnectGetIMAPPort(f.getIMAPPort)

pkg/config/config.go

@@ -189,6 +189,45 @@ func (c *Config) GetLogPrefix() string {
 	return "v" + c.version + "_" + c.revision
 }
 
+// GetLicenseFilePath returns path to liense file.
+func (c *Config) GetLicenseFilePath() string {
+	// User can install app to different location, or user can run it
+	// directly from the package without installation, or it could be
+	// automatically updated (app started from differenet location).
+	// For all those cases, first let's check LICENSE next to the binary.
+	path := filepath.Join(filepath.Dir(os.Args[0]), "LICENSE")
+	if _, err := os.Stat(path); err == nil {
+		return path
+	}
+
+	switch runtime.GOOS {
+	case "linux":
+		appName := c.appName
+		if c.appName == "importExport" {
+			appName = "import-export"
+		}
+		return "/usr/share/doc/protonmail/" + appName + "/LICENSE"
+	case "darwin": //nolint[goconst]
+		path := filepath.Join(filepath.Dir(os.Args[0]), "..", "Resources", "LICENSE")
+		if _, err := os.Stat(path); err == nil {
+			return path
+		}
+
+		appName := "ProtonMail Bridge.app"
+		if c.appName == "importExport" {
+			appName = "ProtonMail Import-Export.app"
+		}
+		return "/Applications/" + appName + "/Contents/Resources/LICENSE"
+	case "windows":
+		// This should not happen, Windows should be handled by relative
+		// location to the binary above. This is just fallback which may
+		// or may not work, depends where user installed the app and how
+		// user started the app.
+		return "C:\\Program Files\\Proton Technologies AG\\ProtonMail Bridge\\LICENSE"
+	}
+	return ""
+}
+
 // GetTLSCertPath returns path to certificate; used for TLS servers (IMAP, SMTP and API).
 func (c *Config) GetTLSCertPath() string {
 	return filepath.Join(c.appDirs.UserConfig(), "cert.pem")

unreleased.md

@@ -6,6 +6,7 @@ Changelog [format](http://keepachangelog.com/en/1.0.0/)
 
 ### Added
 * GODT-906 Handle RFC2047-encoded content transfer encoding values.
+* GODT-270 Added license button in footer to open LICENSE file.
 
 ### Changed
 * GODT-893 Bump go-rfc5322 dependency to v0.2.1 to properly detect syntax errors during parsing.