Meetup login

This tutorial will guild you how to meetup login, at first, you must have meetup account, create a application to receive client id and secret, for more details please see create meetup app.

Once you have client id and secret, please read the instructions below to get start with meetup login.

Note: Meetup login using OAuth 2.0, for more information please read this article.

System requirements

  • PHP 5.4 or higher
  • APACHE 2.4.9 or higher
  • Netbean IDE

Project Structure

meetup-project-structure

Implement code

Create projecthelper.php

We wrote one tutorial about projecthelper.php, view more at here, if you were already read it, please add this function in file.

  • public static function get_meetup_config() {
    return $config = array(
    'client_id' => 'your-client-id',
    'client_secret' => 'client-secret',
    'redirect_uri' => self::get_base_url('meetup-callback.php'),
    'login' => self::get_base_url('meetup-login.php'),
    'session' => 'meetup_access_token'
    );
    }

Create meetup-login.php

This file will undertake two main tasks, check access_token in $_SESSION, if existed, send request to get user's profile, the opposite will create $authen_url for the user grant access your applications to connect to their accounts.

- Create $authen_url link

  •  $auth_url = 'https://secure.meetup.com/oauth2/authorize?' .
    'client_id=' . $config['client_id'] .
    '&redirect_uri=' . $config['redirect_uri'] .
    '&response_type=code';
    echo '<a href="' . $auth_url . '">Log in with Meet up</a>';

- Send request to get user's profile and print result on screen

  •  $access_token = $_SESSION[$config['session']];
    $endpoint = 'https://api.meetup.com/2/member/self/';
    $header = array(
    'GET member/self/ HTTP/1.1',
    'Host: api.meetup.com',
    'Authorization: Bearer ' . $access_token['access_token']
    );

    $data = projecthelper::make_request($endpoint, $header, null);
    var_dump($data);

<?php

if (!session_id()) {
session_start();
}

include './projecthelper.php';
$config = projecthelper::get_meetup_config();

if (isset($_SESSION[$config['session']])) {
$access_token = $_SESSION[$config['session']];
$endpoint = 'https://api.meetup.com/2/member/self/';
$header = array(
'GET member/self/ HTTP/1.1',
'Host: api.meetup.com',
'Authorization: Bearer ' . $access_token['access_token']
);

$data = projecthelper::make_request($endpoint, $header, null);
var_dump($data);
} else {
$auth_url = 'https://secure.meetup.com/oauth2/authorize?' .
'client_id=' . $config['client_id'] .
'&redirect_uri=' . $config['redirect_uri'] .
'&response_type=code';
echo '<a href="' . $auth_url . '">Log in with Meet up</a>';
}

 

Create meetup-callback.php

After granted access to your application, user will be redirected to your redirect_uri with authentication code. Then you will make request to get access_token.
(In some cases, your redirect_uri that you provide must match with the one you've described in app's settings, or redirect_uri must begin with https).

+ Check and extract authentication code

  • Send request to get access_token
  •  $code = $_GET['code'];
    $endpoint = 'https://secure.meetup.com/oauth2/access';
    $post_fields = 'client_id=' . $config['client_id'] .
    '&client_secret=' . $config['client_secret'] .
    '&code=' . $code .
    '&redirect_uri=' . $config['redirect_uri'] .
    '&grant_type=authorization_code';

    $header = array(
    'POST oauth2/access HTTP/1.1',
    'Host: secure.meetup.com'
    );

    $data = projecthelper::make_request($endpoint, $header, $post_fields);
  • Get result, if there is no error, save the result get into $_SESSION and navigate user to the login page.
  •  $_SESSION[$config['session']] = $data;
    header('Location: ' . $config['login']);
  • If there are errors, print to the screen
  •  print_r($data);

+ If there are errors, print to the screen

  • print_r($_GET);

<?php

if (!session_id()) {
session_start();
}
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
include './projecthelper.php';
$config = projecthelper::get_meetup_config();
if (isset($_GET['code'])) {
$code = $_GET['code'];
$endpoint = 'https://secure.meetup.com/oauth2/access';
$post_fields = 'client_id=' . $config['client_id'] .
'&client_secret=' . $config['client_secret'] .
'&code=' . $code .
'&redirect_uri=' . $config['redirect_uri'] .
'&grant_type=authorization_code';

$header = array(
'POST oauth2/access HTTP/1.1',
'Host: secure.meetup.com'
);

$data = projecthelper::make_request($endpoint, $header, $post_fields);

if (isset($data['access_token'])) {
$_SESSION[$config['session']] = $data;
header('Location: ' . $config['login']);
} else {
print_r($data);
}
} else {
print_r($_GET);
}

After implement code, run project and view result or you can view our example here. If you have questions, don't hesitate, tell us