Implement wallpaper portal

Author: Léonard Dallot

README.md

@@ -81,7 +81,7 @@ The list below contains all of the portal interfaces available within the projec
 - [x] Settings
 - [x] Trash
 - [ ] Usb
-- [ ] Wallpaper
+- [x] Wallpaper
 
 
 ## Used by other projects

wallpaper/setWallpaperFile.go

@@ -0,0 +1,20 @@
+package wallpaper
+
+import (
+	"os"
+
+	"github.com/godbus/dbus/v5"
+	"github.com/rymdport/portal/internal/apis"
+)
+
+// SetWallpaperFile sets wallpaper specified as a local file
+func SetWallpaperFile(parentWindow string, file *os.File, options *SetWallpaperOptions) error {
+	data := dbusDataFromOptions(options)
+
+	result, err := apis.Call(setWallpaperFileCallName, parentWindow, dbus.UnixFD(file.Fd()), data)
+	if err != nil {
+		return err
+	}
+
+	return readStatusFromResponse(result.(dbus.ObjectPath))
+}

wallpaper/setWallpaperURI.go

@@ -0,0 +1,26 @@
+package wallpaper
+
+import (
+	"net/url"
+
+	"github.com/godbus/dbus/v5"
+	"github.com/rymdport/portal/internal/apis"
+)
+
+// SetWallpaperURI sets wallpaper specified as an URI (not a local file)
+func SetWallpaperURI(parentWindow string, uri string, options *SetWallpaperOptions) error {
+	// Parse URI as an URL !
+	url, err := url.Parse(uri)
+	if err != nil {
+		return err
+	}
+
+	data := dbusDataFromOptions(options)
+
+	result, err := apis.Call(setWallpaperURICallName, parentWindow, url.String(), data)
+	if err != nil {
+		return err
+	}
+
+	return readStatusFromResponse(result.(dbus.ObjectPath))
+}

wallpaper/wallpaper.go

@@ -0,0 +1,68 @@
+package wallpaper
+
+import (
+	"errors"
+
+	"github.com/godbus/dbus/v5"
+	"github.com/rymdport/portal/internal/apis"
+	"github.com/rymdport/portal/internal/convert"
+	"github.com/rymdport/portal/internal/request"
+)
+
+const (
+	interfaceName            = apis.CallBaseName + ".Wallpaper"
+	setWallpaperURICallName  = interfaceName + ".SetWallpaperURI"
+	setWallpaperFileCallName = interfaceName + ".SetWallpaperFile"
+)
+
+// WallpaperLocation is the type of the parameter SetOn of wallpaper options
+type WallpaperLocation uint
+
+const (
+	Background WallpaperLocation = iota // Set wallpaper of Background
+	Lockscreen                          // Set wallpaper of Locksreen
+	Both                                // Set wallpaper of both background and lockscreen
+)
+
+var wallpaperLocationName = map[WallpaperLocation]string{
+	Background: "background",
+	Lockscreen: "lockscreen",
+	Both:       "both",
+}
+
+func (l WallpaperLocation) String() string {
+	return wallpaperLocationName[l]
+}
+
+// SetWallpaperOptions contains the options of backgound change
+type SetWallpaperOptions struct {
+	ShowPreview bool              // Whether to show a preview of the picture. Note that the portal may decide to show a preview even if this option is not set.
+	SetOn       WallpaperLocation // Where to set the wallpaper. Possible values are Background, Lockscreen, or Both constants
+}
+
+func dbusDataFromOptions(options *SetWallpaperOptions) map[string]dbus.Variant {
+	data := map[string]dbus.Variant{}
+	if options != nil {
+		data["show-preview"] = convert.FromBool(options.ShowPreview)
+		data["set-on"] = convert.FromString(wallpaperLocationName[options.SetOn])
+	}
+	return data
+}
+
+func readStatusFromResponse(path dbus.ObjectPath) error {
+	status, _, err := request.OnSignalResponse(path)
+	if err != nil {
+		return err
+	}
+	switch status {
+	case request.Cancelled:
+		return errors.New("operation cancelled by User")
+	case request.Ended:
+		return errors.New("operation cancelled by system")
+	case request.Success:
+		return nil
+	default:
+		return errors.New("unknown status code")
+	}
+	return nil
+}