googlecallback.py

from flask import make_response, redirect
from requests import post, get

def googleCallback(request, GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET, url_scheme, domain, s):
    try:
        code = request.args.get("code")
        url = "https://www.googleapis.com/oauth2/v4/token" #The baseurl
        headers = {'Content-Type': 'application/x-www-form-urlencoded',}
        params = {'client_id': GOOGLE_CLIENT_ID, 'client_secret': GOOGLE_CLIENT_SECRET, 'code': code, "grant_type": "authorization_code", "redirect_uri": url_scheme + "://" + domain[0] + "/user/google-callback"} #As paramtere we send the client id and the client secret which we get from github when registering an application and the user code from before
        access_token = post(url,params, headers=headers).text.split('access_token": "')[1].split('"')[0]
        authorization_header = {"Authorization": "OAuth %s" % access_token}
        r = get("https://www.googleapis.com/oauth2/v2/userinfo", headers=authorization_header)
        userID = r.text.split('"id": "')[1].split('"')[0]
        name = r.text.split('"name": "')[1].split('"')[0]
        resp = make_response(redirect('/')) #redirect the user at the end back to the main page
        resp.set_cookie('userID', s.dumps("google_" + userID)) #set the cookies with username and userid
        resp.set_cookie('username', s.dumps(name))
        return resp
    except:
        print("Authentication failed")
        
if (__name__ == "__main__"):
    print("This file is not made fore direct call, please run the main.py")
    exit()