deepseek-ai/deepseek-coder-33b-instruct · claims and scope for fastapi

😃: Write me an auth0 integration to fastapi backend.
🤖: Sure, here's a basic example of how you can integrate Auth0 with a FastAPI backend. This example assumes that you have already set up an Auth0 account and have created an application.

First, install the necessary dependencies:

pip install fastapi uvicorn[standard] python-jose[cryptography] requests

Then, create a new FastAPI application:

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from jose import jwt, JWTError
from starlette.requests import Request
from starlette.responses import JSONResponse

app = FastAPI()

# Auth0 settings
AUTH0_DOMAIN = "your-auth0-domain"
API_AUDIENCE = "your-api-audience"
ALGORITHMS = ["RS256"]

# FastAPI dependencies
oauth2_scheme = HTTPBearer(auto_error=False)



@app

	.exception_handler(JWTError)
async def jwt_exception_handler(request: Request, exc: JWTError):
    return JSONResponse(
        status_code=401,
        content={"detail": "Invalid token"},
    )

async def get_current_user(token: HTTPAuthorizationCredentials = Depends(oauth2_scheme)):
    if not token:
        raise HTTPException(status_code=401, detail="Not authenticated")

    try:
        payload = jwt.decode(token.credentials, options={"verify_signature": False})
        return payload
    except JWTError:
        raise HTTPException(status_code=401, detail="Invalid token")



@app

	.get("/")
async def read_root(current_user: dict = Depends(get_current_user)):
    return {"message": "Hello, World!"}

In this example, the get_current_user function is a dependency that will be used to authenticate requests. It uses the python-jose library to decode the JWT token from the Authorization header. If the token is not present or is invalid, it raises an HTTPException.

Please replace "your-auth0-domain" and "your-api-audience" with your actual Auth0 domain and API audience.

This is a very basic example and does not include any actual token verification. In a production application, you would need to verify the token with Auth0's public key. You can get the public key from the Auth0 domain's .well-known/jwks.json endpoint.

Please note that this is a very basic example and does not include any actual token verification. In a production application, you would need to verify the token with Auth0's public key. You can get the public key from the Auth0 domain's .well-known/jwks.json endpoint.
😃: How would I add claims and scope authentication
🤖: To add claims and scope authentication, you need to verify the JWT token with Auth0's public key. Here's how you can do it:

First, you need to get the public key from Auth0. You can do this by making a GET request to the .well-known/jwks.json endpoint of your Auth0 domain.

import json
import requests
from jose import jwt, jwk, JWTError
from jose.utils import base64url_decode

def get_public_key(token, auth0_domain):
    jsonurl = requests.get(f"https://{auth0_domain}/.well-known/jwks.json")
    jwks = jsonurl.json()
    unverified_header = jwt.get_unverified_header(token)
    rsa_key = {}
    for key in jwks["keys"]:
        if key["kid"] == unverified_header["kid"]:
            rsa_key = {
                "kty": key["kty"],
                "kid": key["kid"],
                "use": key["use"],
                "n": key["n"],
                "e": key["e"]
            }
    if rsa_key:
        return jwk.construct(rsa_key)
    else:
        raise JWTError("Invalid token")

Then, you can use this function to verify the JWT token:

def verify_token(token, auth0_domain, audience):
    public_key = get_public_key(token, auth0_domain)
    payload = jwt.decode(token, public_key, algorithms=["RS256"], audience=audience)
    return payload

Now, you can use this function in your get_current_user dependency:

async def get_current_user(token: HTTPAuthorizationCredentials = Depends(oauth2_scheme)):
    if not token:
        raise HTTPException(status_code=401, detail="Not authenticated")

    try:
        payload = verify_token(token.credentials, AUTH0_DOMAIN, API_AUDIENCE)
        return payload
    except JWTError:
        raise HTTPException(status_code=401, detail="Invalid token")

This will verify the JWT token and return the payload. The payload will include the claims and scopes that were included in the token.

Please replace "your-auth0-domain" and "your-api-audience" with your actual Auth0 domain and API audience.