112 lines
3.3 KiB
Python
112 lines
3.3 KiB
Python
import random
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import bcrypt
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jwt.exceptions import InvalidTokenError
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from datetime import datetime, timedelta
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from typing import Annotated, Optional
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import jwt
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from api.util.db_dependency import get_db
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from api.schemas.auth_schemas import *
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from models import User as UserDB
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secret_key = random.randbytes(32)
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algorithm = "HS256"
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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"""
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Helper functions for authentication
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"""
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def verify_password(plain_password, hashed_password):
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return bcrypt.checkpw(
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plain_password.encode("utf-8"), hashed_password.encode("utf-8")
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)
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def get_user(db, username: str):
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"""
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Get the user object from the database
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"""
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user = db.query(UserDB).filter(UserDB.username == username).first()
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if user:
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return UserInDB(**user.__dict__)
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def authenticate_user(db, username: str, password: str):
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"""
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Determine if the correct username and password were provided
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If so, return the user object
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"""
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user = get_user(db, username)
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if not user:
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return False
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if not verify_password(password, user.hashed_password):
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return False
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return user
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def create_access_token(data: dict, expires_delta: timedelta):
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"""
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Return an encoded JWT token with the given data
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"""
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to_encode = data.copy()
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expire = datetime.utcnow() + expires_delta
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to_encode.update({"exp": expire})
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encoded_jwt = jwt.encode(to_encode, secret_key, algorithm=algorithm)
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return encoded_jwt
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# Backwards kinda of way to get refresh token support
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# 'refresh_get_current_user' is only called from /refresh
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# and alerts 'current_user' that it should expect a refresh token
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async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
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user = await current_user(token)
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return user
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async def refresh_get_current_user(
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token: Annotated[str, Depends(oauth2_scheme)],
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):
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user = await current_user(token, is_refresh=True)
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return user
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async def current_user(
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token: str,
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is_refresh: bool = False,
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db=Depends(get_db),
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):
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"""
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Return the current user based on the token, or raise a 401 error
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"""
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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payload = jwt.decode(token, secret_key, algorithms=[algorithm])
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username: str = payload.get("sub")
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refresh: bool = payload.get("refresh")
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if username is None:
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raise credentials_exception
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# For some reason, an access token was passed when a refresh
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# token was expected - some likely malicious activity
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if not refresh and is_refresh:
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raise credentials_exception
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# If the token passed is a refresh token and the function
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# is not expecting a refresh token, raise an error
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if refresh and not is_refresh:
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raise credentials_exception
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token_data = TokenData(username=username)
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except InvalidTokenError:
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raise credentials_exception
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user = get_user(db, username=token_data.username)
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if user is None:
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raise credentials_exception
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return user
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