feat: add get_current_user and require_admin dependencies

app/modules/auth/dependencies.py

@@ -0,0 +1,32 @@
+from fastapi import Depends, HTTPException, Request
+from sqlalchemy.orm import Session
+
+from app.core.auth import decode_token, get_token_from_request
+from app.core.database import get_db
+from app.modules.auth.models import User
+from app.modules.auth.service import get_user
+
+
+class RequiresLoginException(Exception):
+    pass
+
+
+async def get_current_user(
+    request: Request, db: Session = Depends(get_db)
+) -> User:
+    token = get_token_from_request(request)
+    if not token:
+        raise RequiresLoginException()
+    payload = decode_token(token)
+    if not payload:
+        raise RequiresLoginException()
+    user = get_user(db, payload.get("sub", ""))
+    if user is None or not user.is_active:
+        raise RequiresLoginException()
+    return user
+
+
+async def require_admin(user: User = Depends(get_current_user)) -> User:
+    if not user.is_admin:
+        raise HTTPException(status_code=403, detail="Admin access required")
+    return user

tests/test_auth_dependencies.py

@@ -0,0 +1,91 @@
+import pytest
+from fastapi import Depends, FastAPI
+from fastapi.responses import RedirectResponse
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from app.core.auth import create_access_token
+from app.core.database import Base, get_db
+from app.modules.auth.dependencies import RequiresLoginException, get_current_user, require_admin
+from app.modules.auth.models import User
+from app.modules.auth.service import hash_password
+
+
+@pytest.fixture
+def db():
+    engine = create_engine(
+        "sqlite:///:memory:",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    Base.metadata.create_all(bind=engine)
+    Session = sessionmaker(bind=engine)
+    session = Session()
+    yield session
+    session.close()
+    Base.metadata.drop_all(bind=engine)
+
+
+@pytest.fixture
+def test_app(db):
+    app = FastAPI()
+
+    @app.exception_handler(RequiresLoginException)
+    async def handle_login_required(request, exc):
+        return RedirectResponse(url="/auth/login", status_code=307)
+
+    @app.get("/protected")
+    async def protected(user=Depends(get_current_user)):
+        return {"username": user.username}
+
+    @app.get("/admin-only")
+    async def admin_only(user=Depends(require_admin)):
+        return {"username": user.username}
+
+    app.dependency_overrides[get_db] = lambda: db
+    return app
+
+
+@pytest.fixture
+def client(test_app):
+    return TestClient(test_app, follow_redirects=False)
+
+
+def _token_cookie(username: str, is_admin: bool) -> dict:
+    token = create_access_token(username=username, is_admin=is_admin)
+    return {"access_token": token}
+
+
+def test_no_cookie_redirects_to_login(client):
+    response = client.get("/protected")
+    assert response.status_code == 307
+    assert "/auth/login" in response.headers["location"]
+
+
+def test_valid_token_returns_user(client, db):
+    db.add(User(username="bob", full_name="Bob", pw_hash=hash_password("pw")))
+    db.commit()
+    response = client.get("/protected", cookies=_token_cookie("bob", False))
+    assert response.status_code == 200
+    assert response.json()["username"] == "bob"
+
+
+def test_invalid_token_redirects(client):
+    response = client.get("/protected", cookies={"access_token": "invalid"})
+    assert response.status_code == 307
+
+
+def test_require_admin_blocks_non_admin(client, db):
+    db.add(User(username="regular", full_name="R", is_admin=False, pw_hash=hash_password("pw")))
+    db.commit()
+    response = client.get("/admin-only", cookies=_token_cookie("regular", False))
+    assert response.status_code == 403
+
+
+def test_require_admin_allows_admin(client, db):
+    db.add(User(username="admin", full_name="A", is_admin=True, pw_hash=hash_password("pw")))
+    db.commit()
+    response = client.get("/admin-only", cookies=_token_cookie("admin", True))
+    assert response.status_code == 200