feat: Add Google Photos support for transfer configurations

- Introduce Google Photos as a source and destination option in the configuration forms.
- Implement authentication handling and configuration management for Google Photos.
- Update database schema and migrations to include new fields related to Google Photos.
- Enhance UI components to support Google Photos-specific settings and forms.
- Add tests for Google Photos integration, ensuring proper functionality and authentication flow.
- Limit concurrent transfers for Google Photos to ensure compliance with API restrictions.

internal/db/migrations/add_google_photos_support.go

@@ -0,0 +1,61 @@
+package migrations
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+// AddGooglePhotosSupport adds Google Photos related fields to the transfer_configs table
+func AddGooglePhotosSupport() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "20240518_add_google_photos_support",
+		Migrate: func(tx *gorm.DB) error {
+			// Add Google Photos source fields
+			if err := tx.Exec("ALTER TABLE transfer_configs ADD COLUMN source_read_only BOOLEAN DEFAULT false").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs ADD COLUMN source_start_year INTEGER DEFAULT 0").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs ADD COLUMN source_include_archived BOOLEAN DEFAULT false").Error; err != nil {
+				return err
+			}
+
+			// Add Google Photos destination fields
+			if err := tx.Exec("ALTER TABLE transfer_configs ADD COLUMN dest_read_only BOOLEAN DEFAULT false").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs ADD COLUMN dest_start_year INTEGER DEFAULT 0").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs ADD COLUMN dest_include_archived BOOLEAN DEFAULT false").Error; err != nil {
+				return err
+			}
+
+			// Add OAuth field
+			return tx.Exec("ALTER TABLE transfer_configs ADD COLUMN use_builtin_auth BOOLEAN DEFAULT true").Error
+		},
+		Rollback: func(tx *gorm.DB) error {
+			// Remove all added columns in reverse order
+			if err := tx.Exec("ALTER TABLE transfer_configs DROP COLUMN use_builtin_auth").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs DROP COLUMN dest_include_archived").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs DROP COLUMN dest_start_year").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs DROP COLUMN dest_read_only").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs DROP COLUMN source_include_archived").Error; err != nil {
+				return err
+			}
+			if err := tx.Exec("ALTER TABLE transfer_configs DROP COLUMN source_start_year").Error; err != nil {
+				return err
+			}
+			return tx.Exec("ALTER TABLE transfer_configs DROP COLUMN source_read_only").Error
+		},
+	}
+}

internal/db/migrations/migrations.go

@@ -17,6 +17,7 @@ func InitMigrations(db *gorm.DB) *gormigrate.Gormigrate {
 		UpdateSkipProcessedFilesToNullable(),
 		AddWebhookSupport(),
 		AddGoogleDriveAuthenticated(),
+		AddGooglePhotosSupport(),
 	}
 
 	return gormigrate.New(db, gormigrate.DefaultOptions, migrations)