Authentification Fastapi
oauth2_scheme = OAuth2PasswordBearer(tokenUrl='token')
def get_db():
db = SessionLocal()
try:
yield db
finally:
db.close()
async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
credentials_exception = 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("id")
if id is None:
raise credentials_exception
except JWTError:
raise credentials_exception
user = db.get(User, id)
if user is None:
raise credentials_exception
return user
async def check_if_admin(user: schemas.User = Depends(get_current_user)):
if user.role == "admin":
return user
else:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="User is not admin",
headers={"WWW-Authenticate": "Bearer"},
)
def create_access_token(data: dict):
to_encode = data.copy()
expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
to_encode.update({"exp": expire})
encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
return encoded_jwt
def authenticate_user(db: Session, username: str, password: str):
try:
user: User = db.execute(select(User).filter(User.username == username).filter(User.password == password)).scalar_one()
data_dict = {"id": user.user_id, "username": user.username, "role": user.role}
return create_access_token(data_dict)
except Exception as e:
print(e)
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Incorrect username or password",
headers={"WWW-Authenticate": "Bearer"},
)
@app.post('/token')
async def token(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
token = authenticate_user(db, form_data.username, form_data.password)
return {"access_token": token, "token_type": "bearer"}
@app.post("/admin/example_admin_route", dependencies=[Depends(check_if_admin)])
def example_admin_route():
Famous Fox
