Access Google Contacts

contacts.php

<?php
/************************
* Google Contact importer
* 
* Asks for permissions to provide access to your Gmail/Google contacts
* to the given site.
*************************/

// include all required components from Zend Gdata
// from: http://framework.zend.com/download/gdata
require_once 'Zend/Loader.php';
Zend_Loader::loadClass('Zend_Gdata');
Zend_Loader::loadClass('Zend_Gdata_AuthSub');
Zend_Loader::loadClass('Zend_Gdata_Query');
Zend_Loader::loadClass('Zend_Uri_Http');

session_start();

// I'm based this function from the original by Eric (Google)
// from his blog: http://bit.ly/9sKIft 
function setupClient($singleUseToken = null) { 
	$client = null;  
	
	// Fetch a new AuthSub token?
	if (!$singleUseToken) {
		$next = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
		$scope = 'http://www.google.com/m8/feeds';
		$secure = 1;  // <-- important to get secure connection
		$session = 1;
		$permission = 1;  // 1 - allows posting notices && allows reading profile data
		$authSubURL =  Zend_Gdata_AuthSub::getAuthSubTokenUri($next, $scope, $secure, $session);
		
		$authSubURL .= '&permission=' . $permission;
		
		header('Location: '. $authSubURL);
	} else {
		$client = new Zend_Gdata_HttpClient();
		
		// This sets your private key to be used to sign subsequent requests
		$key_file = '/your/absolute/path/to/yourkey.pem';
		$client->setAuthSubPrivateKeyFile($key_file, null, true);
		
		$sessionToken = Zend_Gdata_AuthSub::getAuthSubSessionToken(trim($singleUseToken), $client);
		// Set the long-lived session token for subsequent requests
		$client->setAuthSubToken($sessionToken);
	}
	return $client;
}

$client = setupClient(@$_GET['token']);
// if we already have a client setup
if ($client) {
	$gdata = new Zend_Gdata($client);
	
	// query the Google contacts
	$query = new Zend_Gdata_Query('http://www.google.com/m8/feeds/contacts/default/full');
	$feed = $gdata->getFeed($query);
	$entries = $gdata->retrieveAllEntriesForFeed($feed);
	
	$contacts = array();
	
	// in this example we only display contacts with email addresses
	foreach ($entries as $entry) {
		$name = $entry->title->text;
		$output = '<br />Name: '. $name;
		$email = null;
		$extensions = $entry->getExtensionElements();
		foreach ($extensions as $extension) {
			if ($extension->rootElement == 'email') {
				$attributes = $extension->getExtensionAttributes();
				if (!isset($email)) $output .= ' - Email: '. $attributes['address']['value'];
				$email = $attributes['address']['value'];
			}
		}
		if ($email) {
			print $output;
			$contacts[] = array('name' => $name, 'email' => $email);
		}
	}
}
?>