googlephotos: update read only and read write scopes to meet Google's requirements.

As part of changes to the Google Photos APIs the scopes rclone used
for accessing Google photos have been removed.

This commit replaces the scopes with updated ones.

These aren't as powerful as the old scopes - this means rclone will
only be able to download photos it uploaded from March 31, 2025.

To use these new scopes do `rclone reconnect yourgooglephotosremote:`

Fixes #8434

Co-authored-by: Nick Craig-Wood <nick@craig-wood.com>

backend/googlephotos/googlephotos.go

@@ -43,6 +43,7 @@ var (
 	errAlbumDelete = errors.New("google photos API does not implement deleting albums")
 	errRemove      = errors.New("google photos API only implements removing files from albums")
 	errOwnAlbums   = errors.New("google photos API only allows uploading to albums rclone created")
+	errReadOnly    = errors.New("can't upload files in read only mode")
 )
 
 const (
@@ -52,19 +53,31 @@ const (
 	listChunks                  = 100 // chunk size to read directory listings
 	albumChunks                 = 50  // chunk size to read album listings
 	minSleep                    = 10 * time.Millisecond
-	scopeReadOnly               = "https://www.googleapis.com/auth/photoslibrary.readonly"
-	scopeReadWrite              = "https://www.googleapis.com/auth/photoslibrary"
-	scopeAccess                 = 2 // position of access scope in list
+	scopeAppendOnly             = "https://www.googleapis.com/auth/photoslibrary.appendonly"
+	scopeReadOnly               = "https://www.googleapis.com/auth/photoslibrary.readonly.appcreateddata"
+	scopeReadWrite              = "https://www.googleapis.com/auth/photoslibrary.edit.appcreateddata"
 )
 
 var (
+	// scopes needed for read write access
+	scopesReadWrite = []string{
+		"openid",
+		"profile",
+		scopeAppendOnly,
+		scopeReadOnly,
+		scopeReadWrite,
+	}
+
+	// scopes needed for read only access
+	scopesReadOnly = []string{
+		"openid",
+		"profile",
+		scopeReadOnly,
+	}
+
 	// Description of how to auth for this app
 	oauthConfig = &oauthutil.Config{
-		Scopes: []string{
-			"openid",
-			"profile",
-			scopeReadWrite, // this must be at position scopeAccess
-		},
+		Scopes:       scopesReadWrite,
 		AuthURL:      google.Endpoint.AuthURL,
 		TokenURL:     google.Endpoint.TokenURL,
 		ClientID:     rcloneClientID,
@@ -100,9 +113,9 @@ func init() {
 			case "":
 				// Fill in the scopes
 				if opt.ReadOnly {
-					oauthConfig.Scopes[scopeAccess] = scopeReadOnly
+					oauthConfig.Scopes = scopesReadOnly
 				} else {
-					oauthConfig.Scopes[scopeAccess] = scopeReadWrite
+					oauthConfig.Scopes = scopesReadWrite
 				}
 				return oauthutil.ConfigOut("warning", &oauthutil.Options{
 					OAuth2Config: oauthConfig,
@@ -1120,6 +1133,9 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
 		}
 
 		if !album.IsWriteable {
+			if o.fs.opt.ReadOnly {
+				return errReadOnly
+			}
 			return errOwnAlbums
 		}