144 lines
4.2 KiB
Python
144 lines
4.2 KiB
Python
import random
|
|
import bcrypt
|
|
from fastapi import Depends, HTTPException, status, Cookie
|
|
from fastapi.security import OAuth2PasswordBearer
|
|
from fastapi.responses import RedirectResponse
|
|
from jwt.exceptions import InvalidTokenError
|
|
from datetime import datetime, timedelta
|
|
from typing import Annotated
|
|
import jwt
|
|
|
|
from app.util.db_dependency import get_db
|
|
from sqlalchemy.orm import sessionmaker
|
|
from app.schemas.auth_schemas import *
|
|
from models import User as UserModel
|
|
|
|
secret_key = random.randbytes(32)
|
|
algorithm = "HS256"
|
|
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/auth/token")
|
|
|
|
"""
|
|
Helper functions for authentication
|
|
"""
|
|
|
|
|
|
def verify_password(plain_password, hashed_password):
|
|
return bcrypt.checkpw(
|
|
plain_password.encode("utf-8"), hashed_password.encode("utf-8")
|
|
)
|
|
|
|
|
|
def get_user(db, id: int):
|
|
"""
|
|
Get the user object from the database
|
|
"""
|
|
user = db.query(UserModel).filter(UserModel.id == id).first()
|
|
if user:
|
|
return UserInDB(**user.__dict__)
|
|
|
|
|
|
def authenticate_user(db, username: str, password: str):
|
|
"""
|
|
Determine if the correct username and password were provided
|
|
If so, return the user object
|
|
"""
|
|
user = get_user(db, username)
|
|
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):
|
|
"""
|
|
Return an encoded JWT token with the given data
|
|
"""
|
|
to_encode = data.copy()
|
|
expire = datetime.utcnow() + expires_delta
|
|
to_encode.update({"exp": expire})
|
|
encoded_jwt = jwt.encode(to_encode, secret_key, algorithm=algorithm)
|
|
return encoded_jwt
|
|
|
|
|
|
async def get_current_user_from_cookie(
|
|
access_token: str = Cookie(None), db=Depends(get_db)
|
|
):
|
|
"""
|
|
Return the user based on the access token in the cookie
|
|
|
|
Used for authentication into UI pages - so if no cookie
|
|
exists, redirect to login page rather than returning a 401
|
|
|
|
Also pass is_ui=True to alert get_current_user that we need
|
|
to use RedirectResponse rather than raising an HTTPException
|
|
"""
|
|
if access_token:
|
|
return await get_current_user(access_token, is_ui=True, db=db)
|
|
return RedirectResponse(url="/login")
|
|
|
|
|
|
async def get_current_user_from_token(
|
|
token: Annotated[str, Depends(oauth2_scheme)],
|
|
db=Depends(get_db),
|
|
):
|
|
return await get_current_user(token, db=db)
|
|
|
|
|
|
# Backwards kinda of way to get refresh token support
|
|
# `refresh_get_current_user` is only called from /refresh
|
|
# and alerts `get_current_user` that it should expect a refresh token
|
|
async def refresh_get_current_user(
|
|
token: Annotated[str, Depends(oauth2_scheme)],
|
|
db=Depends(get_db),
|
|
):
|
|
return await get_current_user(token, is_refresh=True, db=db)
|
|
|
|
|
|
async def get_current_user(
|
|
token: str,
|
|
is_refresh: bool = False,
|
|
is_ui: bool = False,
|
|
db: sessionmaker = None,
|
|
):
|
|
"""
|
|
Return the current user based on the token
|
|
|
|
OR on error -
|
|
If is_ui=True, the request is from a UI page and we should redirect to login
|
|
Otherwise, the request is from an API and we should return a 401
|
|
"""
|
|
|
|
def raise_unauthorized():
|
|
if is_ui:
|
|
return RedirectResponse(url="/login")
|
|
raise HTTPException(
|
|
status_code=status.HTTP_401_UNAUTHORIZED,
|
|
detail="Could not validate credentials",
|
|
headers={"WWW-Authenticate": "Bearer"},
|
|
)
|
|
|
|
try:
|
|
payload = jwt.decode(token, secret_key, algorithms=[algorithm])
|
|
id: int = payload.get("sub")
|
|
refresh: bool = payload.get("refresh")
|
|
if not id:
|
|
return raise_unauthorized()
|
|
# For some reason, an access token was passed when a refresh
|
|
# token was expected - some likely malicious activity
|
|
if not refresh and is_refresh:
|
|
return raise_unauthorized()
|
|
# If the token passed is a refresh token and the function
|
|
# is not expecting a refresh token, raise an error
|
|
if refresh and not is_refresh:
|
|
return raise_unauthorized()
|
|
|
|
except InvalidTokenError:
|
|
return raise_unauthorized()
|
|
|
|
user = get_user(db, id)
|
|
if user is None:
|
|
return raise_unauthorized()
|
|
|
|
return user
|