Google API and OAuth 2.0 - php

Question

I'm trying to use google calendar API with php library and i'm facing issues on the authentification of the user to the google api.
I have a question. I've seen some come where you had to set the Api key / developer key to the Google_Client object with the method setDeveloperKey(), but i've also seen some people who don't. Could someone explain to me what difference does it make ?
The thing i'd like to do is to connect a user who have a google account to my application so he can add, list, remove, etc, events from a calendar. This is what i'm doing for the moment for the authentification :
$client = new Google_Client();
$client->setApplicationName("Test GCAL");
$client->setClientId($clientid);
$client->setClientSecret($clientsecret);
$client->setRedirectUri($callback_url);
$client->setAccessType("offline");
$client->setApprovalPrompt("force");
$client->setScopes("https://www.googleapis.com/auth/calendar");
$service = new Google_Service_Calendar($client);
Am i doing it right ?
Does someone have a working commented code that i can analyse ? I can't find one that's working on the internet.. Or maybe a tutorial that explain everything about google api and oauth stuff. I'm so confused about tokens and nobody seems to use refresh tokens, and to me that's essential.. But maybe i'm wrong ?
Thanks for your answers

Answer 1

I don't think you NEED to use setDeveloperKey I suspect that its only used for public APIs to enable you to use them but I haven't really tested it or thought about it before. I will have to look into that a bit more.
This is the code I use for connecting to Google Calendar with Oauth2. ripped directly from the Accessing Google Calendar with PHP – Oauth2 tutorial
<?php
require_once 'Google/Client.php';
require_once 'Google/Service/Calendar.php';
require_once 'CalendarHelper.php';
session_start();
$client = new Google_Client();
$client->setApplicationName("Client_Library_Examples");
$client->setDeveloperKey("AIzaSyBBH88dIQPjcl5nIG-n1mmuQ12J7HThDBE");
$client->setClientId('2046123799103-i6cjd1hkjntu5bkdkjj5cdnpcu4iju8p.apps.googleusercontent.com');
$client->setClientSecret('6s4YOx3upyJhtwnetovfK40e');
$client->setRedirectUri('http://localhost/google-api-php-client-samples/Calendar/oauth2Pure.php');
$client->setAccessType('offline'); // Gets us our refreshtoken
$client->setScopes(array('https://www.googleapis.com/auth/calendar.readonly'));
//For loging out.
if (isset($_GET['logout'])) {
unset($_SESSION['token']);
}
// Step 2: The user accepted your access now you need to exchange it.
if (isset($_GET['code'])) {
$client->authenticate($_GET['code']);
$_SESSION['token'] = $client->getAccessToken();
$redirect = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
header('Location: ' . filter_var($redirect, FILTER_SANITIZE_URL));
}
// Step 1: The user has not authenticated we give them a link to login
if (!isset($_SESSION['token'])) {
$authUrl = $client->createAuthUrl();
print "<a class='login' href='$authUrl'>Connect Me!</a>";
}
// Step 3: We have access we can now create our service
if (isset($_SESSION['token'])) {
$client->setAccessToken($_SESSION['token']);
print "<a class='logout' href='".$_SERVER['PHP_SELF']."?logout=1'>LogOut</a><br>";
$service = new Google_Service_Calendar($client);
$calendarList = $service->calendarList->listCalendarList();;
print_r($calendarList);
while(true) {
foreach ($calendarList->getItems() as $calendarListEntry) {
echo $calendarListEntry->getSummary()."<br>\n";
}
$pageToken = $calendarList->getNextPageToken();
if ($pageToken) {
$optParams = array('pageToken' => $pageToken);
$calendarList = $service->calendarList->listCalendarList($optParams);
} else {
break;
}
}
}
?>