feat(app_dsl_service): enhance error handling and DSL version management (#10108)

api/services/app_dsl_service/exc.py

@@ -0,0 +1,34 @@
+class DSLVersionNotSupportedError(ValueError):
+    """Raised when the imported DSL version is not supported by the current Dify version."""
+
+
+class InvalidYAMLFormatError(ValueError):
+    """Raised when the provided YAML format is invalid."""
+
+
+class MissingAppDataError(ValueError):
+    """Raised when the app data is missing in the provided DSL."""
+
+
+class InvalidAppModeError(ValueError):
+    """Raised when the app mode is invalid."""
+
+
+class MissingWorkflowDataError(ValueError):
+    """Raised when the workflow data is missing in the provided DSL."""
+
+
+class MissingModelConfigError(ValueError):
+    """Raised when the model config data is missing in the provided DSL."""
+
+
+class FileSizeLimitExceededError(ValueError):
+    """Raised when the file size exceeds the allowed limit."""
+
+
+class EmptyContentError(ValueError):
+    """Raised when the content fetched from the URL is empty."""
+
+
+class ContentDecodingError(ValueError):
+    """Raised when there is an error decoding the content."""