Initial commit: XDL Twitter/X video downloader

backend/app/auth.py

@@ -0,0 +1,42 @@
+"""JWT authentication utilities."""
+import os
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+
+SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-key")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_HOURS = 72
+
+security = HTTPBearer()
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    to_encode = data.copy()
+    expire = datetime.utcnow() + (expires_delta or timedelta(hours=ACCESS_TOKEN_EXPIRE_HOURS))
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def verify_token(token: str) -> dict:
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        return payload
+    except JWTError:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
+
+
+async def get_current_user(credentials: HTTPAuthorizationCredentials = Depends(security)) -> dict:
+    return verify_token(credentials.credentials)
+
+
+def optional_auth(credentials: Optional[HTTPAuthorizationCredentials] = Depends(HTTPBearer(auto_error=False))) -> Optional[dict]:
+    """Optional authentication - returns None if no valid token."""
+    if credentials is None:
+        return None
+    try:
+        return verify_token(credentials.credentials)
+    except HTTPException:
+        return None