70 lines
No EOL
2.2 KiB
Python
70 lines
No EOL
2.2 KiB
Python
from datetime import datetime, timedelta
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from typing import Optional
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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# Konfigurationsvariablen
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SECRET_KEY = "dein-geheimer-schlüssel" # In Produktion aus Umgebungsvariablen laden!
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 600
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# Password-Hashing
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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# OAuth2 Setup
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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# Beispiel-Benutzer (in Produktion aus Datenbank laden)
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fake_users_db = {
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"admin": {
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"username": "admin",
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"hashed_password": pwd_context.hash("admin123"),
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}
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}
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def verify_password(plain_password, hashed_password):
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return pwd_context.verify(plain_password, hashed_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 user_dict
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return None
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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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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: Optional[timedelta] = None):
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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)):
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Ungültige Authentifizierungsdaten",
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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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except JWTError:
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raise credentials_exception
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user = get_user(fake_users_db, username)
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if user is None:
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raise credentials_exception
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return user |