Python / Flask google api integration

Question

I'm new to Python as well as in Flask... I have developed an python file which sets up the Oauth2 authentication with googele and fetching the list of messages from GMAIL API. Here is my code

import json
import flask
import httplib2
import base64
import email

from apiclient import discovery, errors
from oauth2client import client


app = flask.Flask(__name__)


@app.route('/')
def index():
    if 'credentials' not in flask.session:
        return flask.redirect(flask.url_for('oauth2callback'))
    credentials = client.OAuth2Credentials.from_json(flask.session['credentials'])
    if credentials.access_token_expired:
        return flask.redirect(flask.url_for('oauth2callback'))
    else:
        http_auth = credentials.authorize(httplib2.Http())
        gmail_service = discovery.build('gmail', 'v1', http_auth)
        threads = gmail_service.users().threads().list(userId='me').execute()
        return json.dumps(threads)


@app.route('/oauth2callback')
def oauth2callback():
    flow = client.flow_from_clientsecrets(
        'client_secrets.json',
        scope='https://mail.google.com/',
        redirect_uri=flask.url_for('oauth2callback', _external=True)
    )
    if 'code' not in flask.request.args:
        auth_uri = flow.step1_get_authorize_url()
        return flask.redirect(auth_uri)
    else:
        auth_code = flask.request.args.get('code')
        credentials = flow.step2_exchange(auth_code)
        flask.session['credentials'] = credentials.to_json()
        return flask.redirect(flask.url_for('index'))

@app.route('/getmail')
def getmail():
    if 'credentials' not in flask.session:
        return flask.redirect(flask.url_for('oauth2callback'))
    credentials = client.OAuth2Credentials.from_json(flask.session['credentials'])
    if credentials.access_token_expired:
        return flask.redirect(flask.url_for('oauth2callback'))
    else:
        http_auth = credentials.authorize(httplib2.Http())
        gmail_service = discovery.build('gmail', 'v1', http_auth)
        query = 'is:inbox'
        """List all Messages of the user's mailbox matching the query.

        Args:
        service: Authorized Gmail API service instance.
        user_id: User's email address. The special value "me"
        can be used to indicate the authenticated user.
        query: String used to filter messages returned.
        Eg.- 'from:user@some_domain.com' for Messages from a particular sender.

        Returns:
        List of Messages that match the criteria of the query. Note that the
        returned list contains Message IDs, you must use get with the
        appropriate ID to get the details of a Message.
        """
        try:
            response = gmail_service.users().messages().list(userId='me', q=query).execute()
            messages = []
            if 'messages' in response:
                print 'test %s' % response
                messages.extend(response['messages'])
            while 'nextPageToken' in response:
                page_token = response['nextPageToken']
                response = gmail_service.users().messages().list(userId='me', q=query, pageToken=page_token).execute()
                messages.extend(response['messages'])

            return messages
        except errors.HttpError, error:
            print 'An error occurred: %s' % error

if __name__ == '__main__':
    import uuid
    app.secret_key = str(uuid.uuid4())
    app.debug = True
    app.run()

Authentication works fine and when I go to /getmail URL I am getting this error TypeError: 'list' object is not callable

Any thoughts what I am doing wrong?

See this answer maybe it helps.

doru
– doru

2015-04-01 09:06:57 +00:00
Commented Apr 1, 2015 at 9:06 — doru
– doru, Commented Apr 1, 2015 at 9:06

Rajat Modi · Accepted Answer · 2015-04-01 09:19:50Z

2

I changed return object in Flask from return messages to this piece of code.

First I imported to from flask.json import jsonify

try:
    response = gmail_service.users().messages().list(userId='me', q=query).execute()
    messages = []
    if 'messages' in response:
        print 'test %s' % response
        messages.extend(response['messages'])
    while 'nextPageToken' in response:
        page_token = response['nextPageToken']
        response = gmail_service.users().messages().list(userId='me', q=query, pageToken=page_token).execute()
        messages.extend(response['messages'])

    return jsonify({'data': messages}) # changed here
except errors.HttpError, error:
    print 'An error occurred: %s' % error

all credit goes to @doru

answered Apr 1, 2015 at 9:19

Rajat Modi

1,34314 silver badges38 bronze badges

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