Posts Tagged Google Data

Jan 3 2010

Zend Framework: How-to interact with Google Calendar (Part 1/2)

Zend Framework has a great interface to access Google Data, this is one of the most easiest ways to implement Google Data API using PHP, in this short how-to i will explain how to authenticate, read and write information from/into your Google Calendar, Zend Framework Documentation has great examples on this. On this first part of this how-to i will explain how-to:

  1. Authenticate on Google Calendar
  2. List all your calendars
  3. Create a new Calendar

I will assume that you are already familiarized with the Zend Framework, and the project is already set up, meaning, include path’s and all extra work.

First let’s include the needed packages into our code:

 
<?php
require_once 'Zend/Gdata.php';
require_once 'Zend/Loader.php';
 
//Let's enable autoload, ZF handles this nicely
Zend_Loader::registerAutoload();
?>

In order to communicate with your Google Calendar, you need first to Authenticate, and there are 3 ways you can use to authenticate: ClientAuth, AuthSub and MagicCookie, you can read the details of each on the Zend Framework Documentation page, on my quick how-to i will use the ClientAuth method.

Authenticating on Google Calendar

 
/**
* Please define your Email and Password for Google Accounts access
*/
define('YOUR_EMAIL_FOR_GOOGLE_ACCOUNTS','');
define('YOUR_PASS_FOR_GOOGLE_ACCOUNTS','');
 
require_once 'Zend/Gdata.php';
require_once 'Zend/Loader.php';
 
//Let's enable autoload, ZF handles this nicely
Zend_Loader::registerAutoload();
$myEmail = YOUR_EMAIL_FOR_GOOGLE_ACCOUNTS;
$myPass  = YOUR_PASS_FOR_GOOGLE_ACCOUNTS;
 
// Parameters for ClientAuth authentication
$service = Zend_Gdata_Calendar::AUTH_SERVICE_NAME;
$client = Zend_Gdata_ClientLogin::getHttpClient($myEmail, $myPass, $service);

Now that we have the authenticated client instance, we are able to interact with Google Calendar. The first action that i do, is to verify if the Calendar i want to write on, exists, if not, i create a new calendar.

Listing calendars and creating a new Calendar

/**
* Lets create the Service instance, to interact with Google Data Api
*/
$service = new Zend_Gdata_Calendar($client);
 
$calendarName = 'My Calendar ZF Example';
$useCalendarFeed = FALSE;
 
try {
// Let's get the calendar list from Google calendar API
$listFeed= $service-&gt;getCalendarListFeed();
} catch (Zend_Gdata_App_Exception $e) {
echo "Error: " . $e-&gt;getMessage();
}
 
/**
* Need to run through all the array to search for our calendar name
* Calendar Listing Feed is available on $listFeed variable
*/
 
foreach ($listFeed as $calendar) {
if($calendar-&gt;title == $calendarName)
$useCalendarFeed = $calendar-&gt;content-&gt;src;
}
 
/**
* If we have not found the calendar we want to use,
* we need to create a new one
*/
if(FALSE === $useCalendarFeed)
{
$appCal = $service-&gt;newListEntry();
$appCal-&gt;title = $service-&gt;newTitle($calendarName);
$own_cal = "http://www.google.com/calendar/feeds/default/owncalendars/full";
$service-&gt;insertEvent($appCal, $own_cal);
 
/**
* Need to grab the Google Calendar feed again, with the newly inserted calendar
* We'll need the refreshed feed in order to get the newly added calendar ID in order
* to add the event into the created calendar
*/
try {
$listFeed= $service-&gt;getCalendarListFeed();
} catch (Zend_Gdata_App_Exception $e) {
echo "Error: " . $e-&gt;getMessage();
}
 
}

If you go to your Google Calendar account a new calendar named “My Calendar ZF Example” was created.

You can download all the code from my Google Code Repository – Zend Framework Google Calendar Example 1/2.

Hope this helped, on the next how-to i will explain how to create events in your newly created calendar.