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server.py
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server.py
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"""Python Flask API Auth0 integration example
"""
from functools import wraps
import json
from os import environ as env, path
import urllib
from dotenv import load_dotenv
from flask import Flask, request, jsonify, _app_ctx_stack
from flask_cors import cross_origin
from jose import jwt
load_dotenv(path.join(path.dirname(__file__), ".env"))
AUTH0_DOMAIN = env["AUTH0_DOMAIN"]
API_AUDIENCE = env["API_ID"]
ALGORITHMS = ["RS256"]
APP = Flask(__name__)
# Format error response and append status code.
def handle_error(error, status_code):
"""Handles the errors
"""
resp = jsonify(error)
resp.status_code = status_code
return resp
def get_token_auth_header():
"""Obtains the access token from the Authorization Header
"""
auth = request.headers.get("Authorization", None)
if not auth:
return handle_error({"code": "authorization_header_missing",
"description":
"Authorization header is expected"}, 401)
parts = auth.split()
if parts[0].lower() != "bearer":
return handle_error({"code": "invalid_header",
"description":
"Authorization header must start with"
"Bearer"}, 401)
elif len(parts) == 1:
return handle_error({"code": "invalid_header",
"description": "Token not found"}, 401)
elif len(parts) > 2:
return handle_error({"code": "invalid_header",
"description": "Authorization header must be"
"Bearer token"}, 401)
token = parts[1]
return token
def requires_scope(required_scope):
"""Determines if the required scope is present in the access token
Args:
required_scope (str): The scope required to access the resource
"""
token = get_token_auth_header()
unverified_claims = jwt.get_unverified_claims(token)
token_scopes = unverified_claims["scope"].split()
for token_scope in token_scopes:
if token_scope == required_scope:
return True
return False
def requires_auth(f):
"""Determines if the access token is valid
"""
@wraps(f)
def decorated(*args, **kwargs):
token = get_token_auth_header()
jsonurl = urllib.urlopen("https://"+AUTH0_DOMAIN+"/.well-known/jwks.json")
jwks = json.loads(jsonurl.read())
try:
unverified_header = jwt.get_unverified_header(token)
except jwt.JWTError:
return handle_error({"code": "invalid_header",
"description": "Invalid header. "
"Use an RS256 signed JWT Access Token"}, 401)
if unverified_header["alg"] == "HS256":
return handle_error({"code": "invalid_header",
"description": "Invalid header. "
"Use an RS256 signed JWT Access Token"}, 401)
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:
try:
payload = jwt.decode(
token,
rsa_key,
algorithms=ALGORITHMS,
audience=API_AUDIENCE,
issuer="https://"+AUTH0_DOMAIN+"/"
)
except jwt.ExpiredSignatureError:
return handle_error({"code": "token_expired",
"description": "token is expired"}, 401)
except jwt.JWTClaimsError:
return handle_error({"code": "invalid_claims",
"description": "incorrect claims,"
" please check the audience and issuer"}, 401)
except Exception:
return handle_error({"code": "invalid_header",
"description": "Unable to parse authentication"
" token."}, 400)
_app_ctx_stack.top.current_user = payload
return f(*args, **kwargs)
return handle_error({"code": "invalid_header",
"description": "Unable to find appropriate key"}, 400)
return decorated
# Controllers API
@APP.route("/ping")
@cross_origin(headers=["Content-Type", "Authorization"])
def ping():
"""No access token required to access this route
"""
return "All good. You don't need to be authenticated to call this"
@APP.route("/secured/ping")
@cross_origin(headers=["Content-Type", "Authorization"])
@cross_origin(headers=["Access-Control-Allow-Origin", "*"])
@requires_auth
def secured_ping():
"""A valid access token is required to access this route
"""
return "All good. You only get this message if you're authenticated"
@APP.route("/secured/private/ping")
@cross_origin(headers=["Content-Type", "Authorization"])
@cross_origin(headers=["Access-Control-Allow-Origin", "*"])
@requires_auth
def secured_private_ping():
"""A valid access token and an appropriate scope are required to access this route
"""
if requires_scope("read:agenda"):
return "All good. You're authenticated and the access token has the appropriate scope"
return "You don't have access to this resource"
if __name__ == "__main__":
APP.run(host="0.0.0.0", port=env.get("PORT", 3001))