Eason09053360 opened a new pull request, #61061:
URL: https://github.com/apache/airflow/pull/61061
## Migrate FAB provider API from connexion to FastAPI
This PR migrates the Flask-AppBuilder (FAB) provider's API layer from
`connexion` to `FastAPI`, creating a new `api_fastapi` module while maintaining
backward compatibility with existing error handling and response formats.
### Changes
#### New Module: `api_fastapi/`
Created a new FastAPI-compatible module structure under
`providers/fab/src/airflow/providers/fab/www/api_fastapi/` with the following
components:
1. **constants.py** - Centralized HTTP status code to documentation URL
mappings
- Maintains `EXCEPTIONS_LINK_MAP` for RFC 7807 Problem Details `type`
field
2. **exceptions.py** - FastAPI exception classes
- Migrated from `connexion.ProblemException` to `fastapi.HTTPException`
- Implemented `common_error_handler` using
`fastapi.responses.JSONResponse`
- Preserves RFC 7807 Problem Details format (`type`, `title`, `status`,
`detail`)
- Exception classes: `NotFound`, `BadRequest`, `Unauthenticated`,
`PermissionDenied`, `Conflict`, `AlreadyExists`, `Unknown`
3. **parameters.py** - Parameter validation and formatting
- Converted Flask/connexion decorators to FastAPI `Query` parameters
- Validation functions: `validate_istimezone()`, `check_limit()`
- Type aliases: `LimitQueryParam`, `OffsetQueryParam`
4. **types.py** - Response type definitions
- Defined `APIResponse` type for FastAPI responses
- Maintained `UpdateMask` type for PATCH operations
5. **security.py** - Authentication dependencies
- Converted Flask decorators to FastAPI `Depends` pattern
- Functions: `check_authentication()`, `requires_access_custom_view()`
- Type alias: `AuthenticatedRequest`
#### Modified Files
- **init_views.py** - Updated import path from `api_connexion.exceptions` to
`api_fastapi.exceptions`
### Testing
- [x] All new files include Apache License 2.0 headers
- [x] Code follows FastAPI best practices (dependency injection, type hints)
- [x] Maintains existing error response format (RFC 7807)
---
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