rag-gateway/app/service/auth.py

from datetime import datetime, timedelta
from jwt import encode, decode, exceptions
from passlib.context import CryptContext
from fastapi import HTTPException, status

from app.config.config import settings
from app.models.user_model import UserModel

SECRET_KEY = settings.secret_key
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 3000

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def verify_password(plain_password, hashed_password):
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password):
    return pwd_context.hash(password)


def authenticate_user(db, username: str, password: str):
    user = db.query(UserModel).filter(UserModel.username == username).first()
    if not user:
        return False
    if not verify_password(password, user.hashed_password):
        return False
    return user


def create_access_token(data: dict, expires_delta: timedelta = None):
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    to_encode.update({"exp": expire})
    encoded_jwt = encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt


def decode_access_token(token: str):
    try:
        payload = decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        return payload
    except exceptions.DecodeError:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Could not validate credentials")