PHP Extension

Get a Google Calendar OAuth2 Access Token

See more Google Calendar Examples

Demonstrates how to get a Google Calendar OAuth2 access token from a desktop application or script. PHP Extension

<?php

include("chilkat.php");

$success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$oauth2 = new CkOAuth2();

// For Google OAuth2, set the listen port equal to the port used
// in the Authorized Redirect URL for the Client ID.
// For example, in this case the Authorized Redirect URL would be http://localhost:55568/
// Your app should choose a port not likely not used by any other application.
$oauth2->put_ListenPort(55568);

$oauth2->put_AuthorizationEndpoint('https://accounts.google.com/o/oauth2/v2/auth');
$oauth2->put_TokenEndpoint('https://www.googleapis.com/oauth2/v4/token');

// Replace these with actual values.
$oauth2->put_ClientId('GOOGLE-CLIENT-ID');
$oauth2->put_ClientSecret('GOOGLE-CLIENT-SECRET');

$oauth2->put_CodeChallenge(true);
$oauth2->put_CodeChallengeMethod('S256');

// These are the scopes for Google Calendar:
// https://www.googleapis.com/auth/calendar 	read/write access to Calendars
// https://www.googleapis.com/auth/calendar.readonly 	read-only access to Calendars
$oauth2->put_Scope('https://www.googleapis.com/auth/calendar');

// Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
$url = $oauth2->startAuth();
if ($oauth2->get_LastMethodSuccess() == false) {
    print $oauth2->lastErrorText() . "\n";
    exit;
}

print $url . "\n";

// Launch the system's default browser navigated to the URL.
$success = $oauth2->LaunchBrowser($url);
if ($success == false) {
    print $oauth2->lastErrorText() . "\n";
    exit;
}

// Now wait for the authorization.
// We'll wait for a max of 30 seconds.
$numMsWaited = 0;
while (($numMsWaited < 30000) and ($oauth2->get_AuthFlowState() < 3)) {
    $oauth2->SleepMs(100);
    $numMsWaited = $numMsWaited + 100;
}

// If there was no response from the browser within 30 seconds, then 
// the AuthFlowState will be equal to 1 or 2.
// 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
// 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
// In that case, cancel the background task started in the call to StartAuth.
if ($oauth2->get_AuthFlowState() < 3) {
    $oauth2->Cancel();
    print 'No response from the browser!' . "\n";
    exit;
}

// Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
// The possible AuthFlowState values are:
// 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
// 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
// 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
if ($oauth2->get_AuthFlowState() == 5) {
    print 'OAuth2 failed to complete.' . "\n";
    print $oauth2->failureInfo() . "\n";
    exit;
}

if ($oauth2->get_AuthFlowState() == 4) {
    print 'OAuth2 authorization was denied.' . "\n";
    print $oauth2->accessTokenResponse() . "\n";
    exit;
}

if ($oauth2->get_AuthFlowState() != 3) {
    print 'Unexpected AuthFlowState:' . $oauth2->get_AuthFlowState() . "\n";
    exit;
}

// Save the full JSON access token response to a file.
$sbJson = new CkStringBuilder();
$sbJson->Append($oauth2->accessTokenResponse());
$sbJson->WriteFile('qa_data/tokens/googleCalendar.json','utf-8',false);

// The saved JSON response looks like this:

// 	{
// 	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
// 	 "token_type": "Bearer",
// 	 "expires_in": 3600,
// 	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
// 	}
// 
print 'OAuth2 authorization granted!' . "\n";
print 'Access Token = ' . $oauth2->accessToken() . "\n";

?>