Fastapi authentication

Fastapi

pip install fastapi
pip install uvicorn # ASGI server
pip install starlette # lightweight ASGI framework/toolkit
pip install pydantic # Data validation and type annotations
# OR
pip install fastapi uvicorn starlette pydantic

Fastapi authentication

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():

Similar codes

0 vote98 views1 answer
How to make code only go once python
Python
12 votes96 views4 answers
Pandas replace values based on condition
Python
21 votes110 views6 answers
Python simple server
Python
2 votes141 views2 answers
Localize timezone python
Python
0 vote94 views1 answer
Py insert char at index
Python
3 votes115 views1 answer
Tf 1 compatible colab
Python
0 vote103 views1 answer
Python count how many times a character appears in a string
Python
12 votes96 views2 answers
How to create dynamic variable names in python
Python
1 vote103 views1 answer
Add text toimage cv2
Python
0 vote103 views2 answers
Additionner liste python
Python