Your PHP application should provide a hyperlink to the
Google URL that performs authentication. The static function
Zend_Gdata_AuthSub::getAuthSubTokenUri()
provides the correct URL. The arguments to this function include
the URL to your PHP application so that Google can
redirect the user's browser back to your application after the user's
credentials have been verified.
After Google's authentication server redirects the user's browser
back to the current application, a GET request parameter is set,
called token. The value of this parameter is a single-use token
that can be used for authenticated access. This token can be converted into a multi-use
token and stored in your session.
Then use the token value in a call to
Zend_Gdata_AuthSub::getHttpClient().
This function returns an instance of Zend_Http_Client,
with appropriate headers set so that subsequent requests your
application submits using that HTTP Client are also authenticated.
Below is an example of PHP code for a web application
to acquire authentication to use the Google Calendar service
and create a Zend_Gdata client object using that authenticated
HTTP Client.
<?php
$my_calendar = 'http://www.google.com/calendar/feeds/default/private/full';
if (!isset($_SESSION['cal_token'])) {
if (isset($_GET['token'])) {
// You can convert the single-use token to a session token.
$session_token =
Zend_Gdata_AuthSub::getAuthSubSessionToken($_GET['token']);
// Store the session token in our session.
$_SESSION['cal_token'] = $session_token;
} else {
// Display link to generate single-use token
$googleUri = Zend_Gdata_AuthSub::getAuthSubTokenUri(
'http://'. $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'],
$my_calendar, 0, 1);
echo "Click <a href='$googleUri'>here</a> " .
"to authorize this application.";
exit();
}
}
// Create an authenticated HTTP Client to talk to Google.
$client = Zend_Gdata_AuthSub::getHttpClient($_SESSION['cal_token']);
// Create a Gdata object using the authenticated Http Client
$cal = new Zend_Gdata_Calendar($client);