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from fastapi import Depends, HTTPException, status, Query
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from jose import JWTError, jwt
from app.database import async_session_maker
from app.models import User
from app.config import settings
from fastapi import Request
from chromadb import AsyncHttpClient
from chromadb.api.models.Collection import Collection
from typing import Optional
security = HTTPBearer(auto_error=False)
async def get_db():
async with async_session_maker() as session:
try:
yield session
await session.commit()
except Exception:
await session.rollback()
raise
finally:
await session.close()
async def get_current_user(
credentials: Optional[HTTPAuthorizationCredentials] = Depends(security),
token_query: Optional[str] = Query(None, alias="token"),
db: AsyncSession = Depends(get_db)
) -> User:
credentials_exception = HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Could not validate credentials",
headers={"WWW-Authenticate": "Bearer"},
)
token = None
if credentials:
token = credentials.credentials
elif token_query:
token = token_query
if not token:
raise credentials_exception
try:
payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
username: str = payload.get("sub")
if username is None:
raise credentials_exception
except JWTError:
raise credentials_exception
result = await db.execute(select(User).filter(User.username == username))
user = result.scalar_one_or_none()
if user is None:
raise credentials_exception
return user
async def get_chroma_client(request: Request) -> AsyncHttpClient:
client = getattr(request.app.state, "chroma_client", None)
if client is None:
raise RuntimeError("ChromaDB client is not initialized in App State.")
return client
def get_chroma_collection(request: Request) -> Collection:
collection = getattr(request.app.state, "chroma_collection", None)
if collection is None:
raise RuntimeError("ChromaDB Collection not loaded during application startup.")
return collection |