health check

src/server/utils/dependencies.py

@@ -0,0 +1,180 @@
+"""
+Dependency injection utilities for FastAPI.
+
+This module provides dependency injection functions for the FastAPI
+application, including SeriesApp instances, database sessions, and
+authentication dependencies.
+"""
+from typing import AsyncGenerator, Optional
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from src.config.settings import settings
+from src.core.SeriesApp import SeriesApp
+
+# Security scheme for JWT authentication
+security = HTTPBearer()
+
+
+# Global SeriesApp instance
+_series_app: Optional[SeriesApp] = None
+
+
+def get_series_app() -> SeriesApp:
+    """
+    Dependency to get SeriesApp instance.
+    
+    Returns:
+        SeriesApp: The main application instance for anime management
+        
+    Raises:
+        HTTPException: If SeriesApp is not initialized or anime directory
+                      is not configured
+    """
+    global _series_app
+    
+    if not settings.anime_directory:
+        raise HTTPException(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            detail="Anime directory not configured. Please complete setup."
+        )
+    
+    if _series_app is None:
+        try:
+            _series_app = SeriesApp(settings.anime_directory)
+        except Exception as e:
+            raise HTTPException(
+                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+                detail=f"Failed to initialize SeriesApp: {str(e)}"
+            )
+    
+    return _series_app
+
+
+def reset_series_app() -> None:
+    """Reset the global SeriesApp instance (for testing or config changes)."""
+    global _series_app
+    _series_app = None
+
+
+async def get_database_session() -> AsyncGenerator[AsyncSession, None]:
+    """
+    Dependency to get database session.
+    
+    Yields:
+        AsyncSession: Database session for async operations
+    """
+    # TODO: Implement database session management
+    # This is a placeholder for future database implementation
+    raise HTTPException(
+        status_code=status.HTTP_501_NOT_IMPLEMENTED,
+        detail="Database functionality not yet implemented"
+    )
+
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security)
+) -> dict:
+    """
+    Dependency to get current authenticated user.
+    
+    Args:
+        credentials: JWT token from Authorization header
+        
+    Returns:
+        dict: User information
+        
+    Raises:
+        HTTPException: If token is invalid or user is not authenticated
+    """
+    # TODO: Implement JWT token validation
+    # This is a placeholder for authentication implementation
+    raise HTTPException(
+        status_code=status.HTTP_501_NOT_IMPLEMENTED,
+        detail="Authentication functionality not yet implemented"
+    )
+
+
+def require_auth(
+    current_user: dict = Depends(get_current_user)
+) -> dict:
+    """
+    Dependency that requires authentication.
+    
+    Args:
+        current_user: Current authenticated user from get_current_user
+        
+    Returns:
+        dict: User information
+    """
+    return current_user
+
+
+def optional_auth(
+    credentials: Optional[HTTPAuthorizationCredentials] = Depends(
+        HTTPBearer(auto_error=False)
+    )
+) -> Optional[dict]:
+    """
+    Dependency for optional authentication.
+    
+    Args:
+        credentials: Optional JWT token from Authorization header
+        
+    Returns:
+        Optional[dict]: User information if authenticated, None otherwise
+    """
+    if credentials is None:
+        return None
+    
+    try:
+        return get_current_user(credentials)
+    except HTTPException:
+        return None
+
+
+class CommonQueryParams:
+    """Common query parameters for API endpoints."""
+    
+    def __init__(self, skip: int = 0, limit: int = 100):
+        self.skip = skip
+        self.limit = limit
+
+
+def common_parameters(
+    skip: int = 0, 
+    limit: int = 100
+) -> CommonQueryParams:
+    """
+    Dependency for common query parameters.
+    
+    Args:
+        skip: Number of items to skip (for pagination)
+        limit: Maximum number of items to return
+        
+    Returns:
+        CommonQueryParams: Common query parameters
+    """
+    return CommonQueryParams(skip=skip, limit=limit)
+
+
+# Dependency for rate limiting (placeholder)
+async def rate_limit_dependency():
+    """
+    Dependency for rate limiting API requests.
+    
+    TODO: Implement rate limiting logic
+    """
+    pass
+
+
+# Dependency for request logging (placeholder)
+async def log_request_dependency():
+    """
+    Dependency for logging API requests.
+    
+    TODO: Implement request logging logic
+    """
+    pass