Examples/flask_test_client not working

[hieyou1]

Hi there,

When I try to access the Khan API thru the flask test client, it says that it "expected a signature base string." I tried fixes I found in other issues but it still isn't working. Here's the error:
KeyError: "Decoder failed to handle oauth_token with data as returned by provider. A different decoder may be needed. Provider returned: b'OAuth error. Invalid signature. Expected signature base string: POST&https%3A%2F%2Fwww.khanacademy.org%2Fapi%2Fauth2%2Frequest_token&oauth_callback%3Dhttp%253A%252F%252Flocalhost%253A5000%252Foauth_callback%26oauth_consumer_key%3DMY-KEY%26oauth_nonce%3Df8cfed8b74ebfb911d733e2ea40e5076d9260ebe%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1565700706%26oauth_version%3D1.0'"

Here's my changed khan_api file. I only remember changing the http to https, but there may be more. {Server.py left unchanged}

"""
This example script shows a possible method for integrating the Khan API into
a flask server
"""

from rauth import OAuth1Service
import requests
from flask import url_for, request, redirect, session
from time import time
import json

# You can get a CONSUMER_KEY and CONSUMER_SECRET for your app here:
# http://www.khanacademy.org/api-apps/register
CONSUMER_KEY = "MY KEY"
CONSUMER_SECRET = "MY SECRET"

# Oauth configuration values described at:
# https://github.com/Khan/khan-api/wiki/Khan-Academy-API-Authentication
SERVER_URL = "https://www.khanacademy.org"
REQUEST_TOKEN_URL = SERVER_URL + "/api/auth2/request_token"
ACCESS_TOKEN_URL = SERVER_URL + "/api/auth2/access_token"
AUTHORIZE_URL = SERVER_URL + "/api/auth2/authorize"
BASE_URL = SERVER_URL + "/api/auth2"

I have no idea what is going on. Doesn't work with PHP either (different error), but I'm not really interested in PHP.

[jb-1980]

When I started the server I saw the exact same error. But when I applied your change (modified the SERVER_URL variable to use https instead of http) the issue was resolved. Are you still seeing this issue?