get github access token

get_github_access_token.php

<?php
$ENV['GITHUB_CLIENT_SECRET' => 'YOUR_CLIENT_SECRET', 'GITHUB_CLIENT_ID' => 'YOUR_CLIENT_ID'];

if (!function_exists('dd')) {
 function dd()
  {
      echo '<pre>';
      array_map(function($x) {var_dump($x);}, func_get_args());
      die;
   }
 }

function get_github_user($access_token): ?array {
  if(strlen($access_token) < 40) {
      echo 'Error: access token too short';
      return null;
  }
  if(is_string($access_token)) {
    //$access_token;

    $ch2 = curl_init();

    curl_setopt($ch2, CURLOPT_URL, 'https://api.github.com/user');
    curl_setopt($ch2, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch2, CURLOPT_CUSTOMREQUEST, 'GET');

    $config['useragent'] = 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0';
    curl_setopt($ch2, CURLOPT_USERAGENT, $config['useragent']);
    $headers = array();
    $headers[] = 'Authorization: token ' . $access_token;
    curl_setopt($ch2, CURLOPT_HTTPHEADER, $headers);

    $result = curl_exec($ch2);
    if (curl_errno($ch2)) {
        echo 'Error:' . curl_error($ch2);
    }
    $github = json_decode($result);
    //store user details somewhere (wherever..)
    $userDetails = [
        'github_username' => $github->login,
        'github_id' => $github->id,
        'github_email' => $github->email,
        'login_at' => time()
    ];
    $user = json_encode($userDetails);
    //var_dump($user);
    return $user;
    curl_close($ch2);
  }

}


//first step: get access token
function github_request_access_token($github_code) {

  $client_id = ? $ENV['GITHUB_CLIENT_ID'];
  $client_secret = $ENV['GITHUB_CLIENT_SECRET'];
  $redirect_uri = $ENV['GITHUB_REDIRECT_URL'] ?? 'http://localhost:8000/github/callback';
  $accesstokenurl = 'https://github.com/login/oauth/access_token';
  $ch = curl_init();

  curl_setopt($ch, CURLOPT_URL, $accesstokenurl);
  curl_setopt($ch, CURLOPT_FAILONERROR, true);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  //curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
   $debug ="client_id=".$client_id. "&client_secret=".$client_secret."&code=".$github_code."&redirect_url=".$redirect_uri."&state=ewanko";

  $postData = array(
    'client_id' => $client_id,
    'client_secret' => $client_secret,
    'code' => $github_code,
    'state' => 'ewanko',
    'redirect_uri' => $redirect_uri);
  $params = http_build_query($postData);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $params);

  $headers = array();
  $headers[] = 'Content-Type: application/x-www-form-urlencoded';
  $headers[] = 'Accept: application/json';

  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  curl_setopt($ch,CURLOPT_USERAGENT, 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:7.0.1) Gecko/20100101 Firefox/7.0.1');

  $result = curl_exec($ch);
  if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
  }
  //($postData);
  if(!is_string($result)) {
    echo "<a href=\"http://localhost:8000/reset?code=".$github_code."&clear=true\">Reset</a>";
    die('Error: Unexpected issue with code:' . $github_code);
  } else {
    //get github details using access token
    $github_user = get_github_user($result);
  }

  if(isset($jsonData) ) {
    $err_object = ['message' => 'We have an error', 'status' => false, 'response' => $jsonData];
    //dd($err_object);

    return $err_object;
  } else {
    parse_str($result, $res);
    return $res;
  }
  curl_close($ch);
}