I am new to FastApi. I am trying to authenticate an user and redirect him to a protected endpoint. Upon giving the username and password (johndoe, secret) in /docs or /token, I am getting the authentication token. In the examples, they use cURL to "pass the token" with the request to a protected endpoint, but how do I do it during deployment?
curl -X 'GET' \
'http://127.0.0.1:8000/view' \
-H 'accept: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJqb2huZG9lIiwiZXhwIjoxNjE5MjEwMjYxfQ.g-NCbaEP0DzSw6FY1SQVHMlH3hzG3lTvWBkeJabuLwE'
The code below is from the tutorial.
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from fastapi import FastAPI, Request, Depends, HTTPException, status
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse
from passlib.context import CryptContext
from datetime import datetime, timedelta
from pydantic import BaseModel
from jose import JWTError, jwt
from typing import Optional
fake_users_db = {
"johndoe": {
"username": "johndoe",
"full_name": "John Doe",
"email": "johndoe@example.com",
"hashed_password": "$2b$12$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQoeG6Lruj3vjPGga31lW",
"disabled": False,
}
}
# openssl rand -hex 32
SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30
app = FastAPI()
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
# for css files
app.mount("/static", StaticFiles(directory="static"), name="static")
templates = Jinja2Templates(directory="templates")
class Token(BaseModel):
access_token: str
token_type: str
class TokenData(BaseModel):
username: Optional[str] = None
class User(BaseModel):
username: str
email: Optional[str] = None
full_name: Optional[str] = None
disabled: Optional[bool] = None
class UserInDB(User):
hashed_password: str
def get_password_hash(password):
return pwd_context.hash(password)
def verify_password(plain_password, hashed_password):
return pwd_context.verify(plain_password, hashed_password)
def get_user(db, username: str):
if username in db:
user_dict = db[username]
return UserInDB(**user_dict)
def authenticate_user(fake_db, username: str, password: str):
user = get_user(fake_db, username)
if not user:
return False
if not verify_password(password, user.hashed_password):
return False
return user
def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
to_encode = data.copy()
if expires_delta:
expire = datetime.utcnow() + expires_delta
else:
expire = datetime.utcnow() + timedelta(minutes=15)
to_encode.update({"exp": expire})
encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
return encoded_jwt
async def get_current_user(token: str = Depends(oauth2_scheme)):
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])
username: str = payload.get("sub")
if username is None:
raise credentials_exception
token_data = TokenData(username=username)
except JWTError:
raise credentials_exception
user = get_user(fake_users_db, username=token_data.username)
if user is None:
raise credentials_exception
return user
async def get_current_active_user(current_user: User = Depends(get_current_user)):
if current_user.disabled:
raise HTTPException(status_code=400, detail="Inactive user")
return current_user
@app.get("/token", response_class=HTMLResponse)
async def read_login(request: Request):
# login.html is a simple html form that takes in an username and a password
return templates.TemplateResponse("login.html", {"request": request})
@app.post("/token", response_model=Token)
async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
user = authenticate_user(fake_users_db, form_data.username, form_data.password)
if not user:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Incorrect username or password",
headers={"WWW-Authenticate": "Bearer"},
)
access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
access_token = create_access_token(
data={"sub": user.username}, expires_delta=access_token_expires
)
return {"access_token": access_token, "token_type": "bearer"}
@app.get("/view"): # private endpoint. redirect here!
async def read_view(current_user: User = Depends(get_current_active_user)):
return {"Neo": "We need guns. Lots of guns."}
In short, I want the server to authenticate (done) and redirect the user to a private endpoint and the browser to remember the token and pass it along whenever it requests a private endpoint. Sorry if this is silly!
