systray: enable only if the StatusNotifierWatcher is available on the…

… supported unix system

CHANGELOG.md

@@ -6,6 +6,7 @@
 - all: update Fyne to v2.5.3
 - all: update age to v1.2.1
 - ui: fix a possible nil pointer on loginURL when upgrading paw from previous versions
+- systray: enable only if the StatusNotifierWatcher is available on the supported unix system
 
 - deps update:
   - fyne.io/fyne v2.5.3

go.mod

@@ -6,6 +6,7 @@ require (
 	filippo.io/age v1.2.1
 	fyne.io/fyne/v2 v2.5.3
 	github.com/fyne-io/image v0.0.0-20220602074514-4956b0afb3d2
+	github.com/godbus/dbus/v5 v5.1.0
 	github.com/stretchr/testify v1.8.4
 	golang.design/x/clipboard v0.7.0
 	golang.org/x/crypto v0.32.0
@@ -28,7 +29,6 @@ require (
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20240506104042-037f3cc74f2a // indirect
 	github.com/go-text/render v0.2.0 // indirect
 	github.com/go-text/typesetting v0.2.0 // indirect
-	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/gopherjs/gopherjs v1.17.2 // indirect
 	github.com/jeandeaual/go-locale v0.0.0-20240223122105-ce5225dcaa49 // indirect
 	github.com/jsummers/gobmp v0.0.0-20151104160322-e2ba15ffa76e // indirect

internal/ui/app.go

@@ -17,6 +17,7 @@ import (
 	"fyne.io/fyne/v2/driver/desktop"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
+	"github.com/godbus/dbus/v5"
 
 	"lucor.dev/paw/internal/agent"
 	"lucor.dev/paw/internal/icon"
@@ -86,6 +87,10 @@ func (a *app) agentClient() agent.PawAgent {
 
 func (a *app) makeSysTray() {
 	if desk, ok := fyne.CurrentApp().(desktop.App); ok {
+		if err := checkStatusNotifierWatcher(); err != nil {
+			log.Println("systray not available: %w", err)
+			return
+		}
 		a.win.SetCloseIntercept(a.win.Hide) // don't close the window if system tray used
 		menu := fyne.NewMenu("Vaults", a.makeVaultMenuItems()...)
 		desk.SetSystemTrayMenu(menu)
@@ -260,3 +265,27 @@ func imageFromResource(resource fyne.Resource) *canvas.Image {
 	img.SetMinSize(fyne.NewSize(64, 64))
 	return img
 }
+
+// checkStatusNotifierWatcher checks if the StatusNotifierWatcher is available on the supported unix system
+func checkStatusNotifierWatcher() error {
+	// systrayUnixSupportedOSes list the supported unix system by https://github.com/fyne-io/systray
+	// see: https://github.com/fyne-io/systray/blob/master/systray_unix.go#L1
+	systrayUnixSupportedOSes := map[string]bool{
+		"linux":   true,
+		"freebsd": true,
+		"openbsd": true,
+		"netbsd":  true,
+	}
+	if !systrayUnixSupportedOSes[runtime.GOOS] {
+		return nil
+	}
+	conn, err := dbus.ConnectSessionBus()
+	if err != nil {
+		return fmt.Errorf("Failed to connect to session bus: %w", err)
+	}
+	defer conn.Close()
+
+	obj := conn.Object("org.kde.StatusNotifierWatcher", "/StatusNotifierWatcher")
+	call := obj.Call("org.kde.StatusNotifierWatcher.RegisterStatusNotifierItem", 0, "/StatusNotifierItem")
+	return call.Err
+}