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#coding: utf-8

import requests
from urllib import urlencode
import json
from subprocess import Popen
from flask import Flask,redirect,request

client_id = "your client id"
client_secret = "your client secret"
redirect_uri = "http://your_url/authorized"
base_url = r"https://accounts.google.com/o/oauth2/"
authorization_code = ""
access_token = ""

app = Flask(__name__)
"""
Retrieving authorization_code from authorization API.
"""
@app.route("/login")
def login():
  authorization_code_req = {
    "response_type": "code",
    "client_id": client_id,
    "redirect_uri": redirect_uri,
    "scope": (r"https://www.googleapis.com/auth/userinfo.profile" +
              r" https://www.googleapis.com/auth/userinfo.email" +
              r" https://www.googleapis.com/auth/calendar")
    }

  r = requests.get(base_url + "auth?%s" % urlencode(authorization_code_req),
                   allow_redirects=False)
  url = r.headers.get('location')
  print url
  return redirect(url)


def retrieve_tokens(authorization_code):
  access_token_req = {
    "code" : authorization_code,
    "client_id" : client_id,
    "client_secret" : client_secret,
    "redirect_uri" : redirect_uri,
    "grant_type": "authorization_code",
    }
  content_length=len(urlencode(access_token_req))
  access_token_req['content-length'] = str(content_length)

  r = requests.post(base_url + "token", data=access_token_req)
  data = json.loads(r.text)
  return data











@app.route("/authorized")
def authorized():
    code =  request.args["code"]
    data = retrieve_tokens(code)
    access_token = data["access_token"]
    print access_token
    print "end"

    authorization_header = {"Authorization": "OAuth %s" % access_token}
    r = requests.get("https://www.googleapis.com/oauth2/v2/userinfo", 
      headers=authorization_header)
    return r.text



if __name__ == '__main__':
     app.run(debug=True,port=8000)