Add contact using google contact api

add_google_contact.php

 <?php
require_once("google_api_info.php");
//TODO
$redirect_uri = "http://localhost/D%C3%A9veloppement/HISTU/ajout_contact.php";

$group_id = "6"; // Used as the default 'My Contacts' group.

require_once ('Google/Client.php');
require_once ('Google/Http/Request.php');

session_start();

$client = new Google_Client();
$client->setApplicationName("Ajout contact School Phenomenon");
$client->setScopes(array(
	'https://www.googleapis.com/auth/userinfo.email',
    'https://apps-apis.google.com/a/feeds/groups/',
    'https://apps-apis.google.com/a/feeds/alias/',
    'https://apps-apis.google.com/a/feeds/user/',
    'https://www.google.com/m8/feeds/',
    'https://www.google.com/m8/feeds/user/'
));

// Documentation: http://code.google.com/googleapps/domain/provisioning_API_v2_developers_guide.html
// Visit https://code.google.com/apis/console to generate your
// oauth2_client_id, oauth2_client_secret, and to register your oauth2_redirect_uri.

$client->setClientId($client_id);
$client->setClientSecret($client_secret);
$client->setRedirectUri($redirect_uri);
//TODO
//$client->setDeveloperKey('DEVELOPER_KEY');

if (isset($_REQUEST['logout'])) {
    unset($_SESSION['access_token']);
}

if (isset($_GET['code'])) {
    $client->authenticate($_GET['code']);
    $_SESSION['access_token'] = $client->getAccessToken();
    header('Location: ' . $redirect_uri);
}

if (isset($_SESSION['access_token'])) {

    $client->setAccessToken($_SESSION['access_token']);

	$token_data = $client->verifyIdToken()->getAttributes();

    //Get Email of User ------------------------------------
    // You are now logged in
    // We need the users email address for later use. We can get that here.

    $user_email = $token_data['payload']['email']; // email address

    //-------------------------------------
    // How to save an entry to your My Contacts List
    // This is an example contact XML that Google is looking for.

    $contact = "
    <atom:entry xmlns:atom='http://www.w3.org/2005/Atom'
        xmlns:gd='http://schemas.google.com/g/2005'
        xmlns:gContact='http://schemas.google.com/contact/2008'>
      <atom:category scheme='http://schemas.google.com/g/2005#kind'
        term='http://schemas.google.com/contact/2008#contact'/>
      <gd:name>
         <gd:givenName>HELLO</gd:givenName>
         <gd:familyName>WORLD</gd:familyName>
         <gd:fullName>Hello World</gd:fullName>
      </gd:name>
      <atom:content type='text'>Notes</atom:content>
      <gd:email rel='http://schemas.google.com/g/2005#work'
        primary='true'
        address='liz@gmail.com' displayName='E. Bennet'/>
      <gd:email rel='http://schemas.google.com/g/2005#home'
        address='liz@example.org'/>
      <gd:phoneNumber rel='http://schemas.google.com/g/2005#work'
        primary='true'>
        (206)555-1212
      </gd:phoneNumber>
      <gd:phoneNumber rel='http://schemas.google.com/g/2005#home'>
        (206)555-1213
      </gd:phoneNumber>
      <gd:im address='liz@gmail.com'
        protocol='http://schemas.google.com/g/2005#GOOGLE_TALK'
        primary='true'
        rel='http://schemas.google.com/g/2005#home'/>
      <gd:structuredPostalAddress
          rel='http://schemas.google.com/g/2005#work'
          primary='true'>
        <gd:city>Mountain View</gd:city>
        <gd:street>1600 Amphitheatre Pkwy</gd:street>
        <gd:region>CA</gd:region>
        <gd:postcode>94043</gd:postcode>
        <gd:country>United States</gd:country>
        <gd:formattedAddress>
          1600 Amphitheatre Pkwy Mountain View
        </gd:formattedAddress>
      </gd:structuredPostalAddress>
     <gContact:groupMembershipInfo deleted='false'
            href='http://www.google.com/m8/feeds/groups/" . $user_email . "/base/6'/>
    </atom:entry>
    ";

    $len = strlen($contact);
    $add = new Google_Http_Request("https://www.google.com/m8/feeds/contacts/default/full/");
    $add->setRequestMethod("POST");
    $add->setPostBody($contact);
    $add->setRequestHeaders(array(
        'content-length' => $len,
        'GData-Version' => '3.0',
        'content-type' => 'application/atom+xml; charset=UTF-8; type=feed'
    ));

	$add = $client->getAuth()->sign($add);

    $submit       = $client->getIo()->executeRequest($add);

    $sub_response = $submit->getResponseBody();

    $parsed    = simplexml_load_string($sub_response);
    $client_id = explode("base/", $parsed->id);
    
    // Contact Groups -------------------------------------------------
    // This section will collect all the groups for this user for contact sorting.
    // For now, I have set the default group to "My Contacts" of that user.

    $group = "http%3A%2F%2Fwww.google.com%2Fm8%2Ffeeds%2Fgroups%2F" . $user_email . "%2Fbase%2F6";
    
    
    //Get Contacts by Group -------------------------------------------------------------------
    // Now we request the users contacts based on group. For now, we will retreive 'My Contacts'

    $req = new Google_Http_Request("https://www.google.com/m8/feeds/contacts/" . $user_email . "/full?group=" . $group);
    $req->setRequestHeaders(array(
        'GData-Version' => '3.0',
        'content-type' => 'application/atom+xml; charset=UTF-8; type=feed'
    ));
    $val = $client->getIo()->authenticatedRequest($req);

    // The contacts api only returns XML responses.
    $response = $val->getResponseBody();

    $xml = simplexml_load_string($response); // Convert the response to an ARRAY

    //print_r($xml);

    echo "Group: " . $xml->title . "<br>";
    echo "Email: " . $xml->id . "<br>";
    echo "<hr><br>";

    for ($i = 0; $i <= sizeof($xml->entry); $i++) {
        echo $xml->entry[$i]->title . "<br>";
    }

    // The access token may have been updated lazily.
    $_SESSION['access_token'] = $client->getAccessToken();
} else {
    $authUrl = $client->createAuthUrl();
}

if (isset($authUrl)) {
    print "<a class='login' href='$authUrl'>Connect Me!</a>";
} else {
    print "<a class='logout' href='?logout'>Logout</a>";
}

?>

where is 'google_api_info.php'

Can we write these things in Nodejs??

please where is 'google_api_info.php' and also, this is 2018 can you let us know if there is updated version of the code written above because some link and api parameters might have been updated by google itself. Thank you!