feat(FN-004): merge fusion/fn-004

apps/api/app/auth/dependencies.py

@@ -0,0 +1,93 @@
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.auth.jwt import decode_token
+from app.config import settings
+from app.db import get_db_session
+from app.models.user import User
+
+bearer_scheme = HTTPBearer(auto_error=False)
+
+
+async def _get_or_create_dev_user(session: AsyncSession) -> User:
+    """Return or create the fixed development user."""
+    result = await session.execute(
+        select(User).where(User.authentik_sub == "dev-user")
+    )
+    user = result.scalar_one_or_none()
+    if user is None:
+        user = User(
+            authentik_sub="dev-user",
+            email="dev@localhost",
+            display_name="Dev User",
+            is_active=True,
+        )
+        session.add(user)
+        await session.commit()
+        await session.refresh(user)
+    return user
+
+
+async def get_current_user(
+    token: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
+    session: AsyncSession = Depends(get_db_session),
+) -> User:
+    if token is None:
+        if settings.debug and settings.auth_dev_bypass:
+            return await _get_or_create_dev_user(session)
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Not authenticated",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    try:
+        claims = decode_token(token.credentials)
+    except Exception as exc:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail=f"Invalid token: {exc}",
+            headers={"WWW-Authenticate": "Bearer"},
+        ) from exc
+
+    authentik_sub = claims.get("sub")
+    email = claims.get("email", "")
+    display_name = claims.get("name") or claims.get("preferred_username") or email
+
+    if not authentik_sub:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Token missing 'sub' claim",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    result = await session.execute(
+        select(User).where(User.authentik_sub == authentik_sub)
+    )
+    user = result.scalar_one_or_none()
+
+    if user is None:
+        user = User(
+            authentik_sub=authentik_sub,
+            email=email,
+            display_name=display_name,
+            is_active=True,
+        )
+        session.add(user)
+        await session.commit()
+        await session.refresh(user)
+
+    return user
+
+
+async def get_current_active_user(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    if not current_user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Inactive user",
+        )
+    return current_user