103 lines
3.4 KiB
Python
103 lines
3.4 KiB
Python
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from datetime import timedelta, datetime, timezone
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from typing import Annotated
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import jwt
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from fastapi import Depends, HTTPException
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from passlib.exc import InvalidTokenError
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from starlette import status
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from config import SECRET_KEY, get_fake_users_db, pwd_context, oauth2_scheme, ALGORITHM
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from models import UserInDB, User
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import base64
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import hashlib
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import hmac
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def verify_password(plain_password, hashed_password):
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try:
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# Decode the stored hash
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decoded = base64.b64decode(hashed_password)
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salt, stored_hash = decoded[:16], decoded[16:]
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# Hash the plain password with the same salt
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key = hashlib.sha256(salt).digest()
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new_hash = hmac.new(key, plain_password.encode('utf-8'), hashlib.sha256).digest()
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# Compare the new hash with the stored hash
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return hmac.compare_digest(new_hash, stored_hash)
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except (TypeError, ValueError, base64.binascii.Error):
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# This will catch any decoding errors or incorrect hash format
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return False
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def get_password_hash(password):
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return pwd_context.hash(password)
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def get_user(db, username: str):
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if username in db:
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user_dict = db[username]
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return UserInDB(**user_dict)
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from fastapi import HTTPException, status
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def authenticate_user(fake_db, username: str, password: str):
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user = get_user(fake_db, username)
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if not user:
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print(f"User not found: {username}") # Debug print
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Incorrect username",
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headers={"WWW-Authenticate": "Bearer"},
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)
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print(f"Stored hash: {user.hashed_password}") # Debug print
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print(f"Provided password: {password}") # Debug print
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if not verify_password(password, user.hashed_password):
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print("Password verification failed") # Debug print
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Incorrect password",
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headers={"WWW-Authenticate": "Bearer"},
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)
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return user
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def create_access_token(data: dict, expires_delta: timedelta | None = None):
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.now(timezone.utc) + expires_delta
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else:
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expire = datetime.now(timezone.utc) + timedelta(minutes=15)
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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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async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
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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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if username is None:
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raise credentials_exception
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token_data = User(username=username)
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except InvalidTokenError:
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raise credentials_exception
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user = get_user(get_fake_users_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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async def get_current_active_user(
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current_user: Annotated[User, Depends(get_current_user)],
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):
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if current_user.disabled:
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raise HTTPException(status_code=400, detail="Inactive user")
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return current_user
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