87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
from datetime import datetime, timedelta
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from typing import Optional
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from users import UserInDB, TokenData, fake_users_db
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# Configuration
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SECRET_KEY = "your-secret-key-here-change-in-production"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 30
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# Password hashing
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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# OAuth2 scheme
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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"""Verify a plain password against its hash."""
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password: str) -> str:
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"""Hash a password."""
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return pwd_context.hash(password)
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def get_user(db: dict, username: str) -> Optional[UserInDB]:
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"""Get a user from the database."""
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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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return None
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def authenticate_user(fake_db: dict, username: str, password: str) -> Optional[UserInDB]:
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"""Authenticate a user."""
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user = get_user(fake_db, username)
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if not user:
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return None
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if not verify_password(password, user.hashed_password):
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return None
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return user
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
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"""Create a JWT access token."""
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + 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: str = Depends(oauth2_scheme)) -> UserInDB:
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"""Get the current authenticated user from JWT token."""
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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 = TokenData(username=username)
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except JWTError:
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raise credentials_exception
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user = get_user(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(current_user: UserInDB = Depends(get_current_user)) -> UserInDB:
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"""Get the current active user."""
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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 |