2a9ebe24: Implement auth endpoints (register/login/JWT) with SQLAlchemy

app/deps.py

@@ -0,0 +1,55 @@
+"""FastAPI dependencies for authentication and database access."""
+from typing import Annotated
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+from sqlalchemy.orm import Session
+
+from app.db.database import get_db
+from app.models.user import User
+from app.services.auth_service import AuthService, decode_token
+
+
+security = HTTPBearer()
+
+
+async def get_current_user(
+    credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)],
+    db: Annotated[Session, Depends(get_db)],
+) -> User:
+    """Get the current authenticated user from JWT token.
+
+    Args:
+        credentials: The HTTP Bearer credentials containing the JWT token.
+        db: Database session.
+
+    Returns:
+        The authenticated User object.
+
+    Raises:
+        HTTPException: If token is invalid or user not found.
+    """
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Invalid authentication credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    try:
+        payload = decode_token(credentials.credentials)
+        user_id_str: str = payload.get("sub")
+        if user_id_str is None:
+            raise credentials_exception
+        user_id = int(user_id_str)
+    except (JWTError, ValueError):
+        raise credentials_exception
+
+    user = AuthService.get_user_by_id(db, user_id)
+    if user is None:
+        raise credentials_exception
+
+    return user
+
+
+# Type alias for dependency injection
+CurrentUser = Annotated[User, Depends(get_current_user)]