PHP

Google OAuth2 Refresh Access Token

See more Google APIs Examples

Demonstrates how to refresh a Google Access Token. Chilkat2 PHP

<?php

use Chilkat2\JsonObject;
use Chilkat2\OAuth2;
use Chilkat2\StringBuilder;

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

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file
// saved by this example: Google OAuth2 Access Token

$jsonToken = new JsonObject();
try {
    $jsonToken->LoadFile('qa_data/tokens/_googleDrive.json');
} catch (\Chilkat2\Exception $e) {
    echo "Failed to load _googleDrive.json\n";
    exit;
}

// The access token JSON looks like this:

//     {
//      "access_token": "abac.Ci-ZabcdF37-NUrmSzxbHxTsMbtlN-uPfabcdAQN_2ekzj0s5ofCzRabcdTDMGaa2Q",
//      "token_type": "Bearer",
//      "expires_in": 3600,
//      "refresh_token": "1/lEe5abcdNJ77eOSDBabcdkQGVmDalkwabcdR2Hatbo"
//     }
//

$oauth2 = new OAuth2();

$oauth2->TokenEndpoint = 'https://www.googleapis.com/oauth2/v4/token';

// Replace these with actual values.
$oauth2->ClientId = 'GOOGLE_CLIENT_ID';
$oauth2->ClientSecret = 'GOOGLE_CLIENT_SECRET';

// Get the "refresh_token"
$oauth2->RefreshToken = $jsonToken->StringOf('refresh_token');

// Send the HTTP POST to refresh the access token..
try {
    $oauth2->RefreshAccessToken();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// The response contains a new access token, but we must keep
// our existing refresh token for when we need to refresh again in the future.
$jsonToken->UpdateString('access_token', $oauth2->AccessToken);

// Save the new JSON access token response to a file.
$sbJson = new StringBuilder();
$jsonToken->EmitCompact = false;
$jsonToken->EmitSb($sbJson);
$sbJson->WriteFile('qa_data/tokens/_googleDrive.json', 'utf-8', false);

echo "OAuth2 authorization granted!\n";
echo 'New Access Token = ', $oauth2->AccessToken, "\n";