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video-gen-api/app/services/auth.py

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+from datetime import datetime, timedelta, timezone
+
+import bcrypt
+import jwt
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.config import settings
+from app.models.user import User
+
+
+def hash_password(plain: str) -> str:
+    return bcrypt.hashpw(plain.encode(), bcrypt.gensalt()).decode()
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return bcrypt.checkpw(plain.encode(), hashed.encode())
+
+
+def create_access_token(user_id: str, remember_me: bool = False) -> str:
+    minutes = settings.JWT_EXPIRE_REMEMBER_MINUTES if remember_me else settings.JWT_EXPIRE_MINUTES
+    expire = datetime.now(timezone.utc) + timedelta(minutes=minutes)
+    payload = {"sub": user_id, "exp": expire}
+    return jwt.encode(payload, settings.SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
+
+
+def decode_access_token(token: str) -> str | None:
+    """Decode JWT and return user_id, or None if invalid."""
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.JWT_ALGORITHM]
+        )
+        return payload.get("sub")
+    except jwt.PyJWTError:
+        return None
+
+
+async def authenticate_user(
+    db: AsyncSession, username: str, password: str
+) -> User | None:
+    result = await db.execute(select(User).where(User.username == username))
+    user = result.scalar_one_or_none()
+    if not user:
+        # Try phone number lookup for frontend users
+        result = await db.execute(select(User).where(User.phone == username))
+        user = result.scalar_one_or_none()
+    if not user or not verify_password(password, user.hashed_password):
+        return None
+    if not user.is_active:
+        return None
+    return user