(PHP Extension) Microsoft Graph OAuth2 Client Credentials Grant Flow

Demonstrates how to get a Microsoft Graph access token using the Client Credentials Grant Flow.

You can use the OAuth 2.0 client credentials grant specified in RFC 6749, sometimes called two-legged OAuth, to access web-hosted resources by using the identity of an application. This type of grant is commonly used for server-to-server interactions that must run in the background, without immediate interaction with a user. These types of applications are often referred to as daemons or service accounts.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$http = new CkHttp();

$req = new CkHttpRequest();
$req->AddParam('client_secret','CLIENT_SECRET');
$req->AddParam('client_id','CLIENT_ID');
// Don't know if the scopes valid for the client credentials grant are different than the scopes for the 3-legged Authorization Code Grant...
$req->AddParam('scope','https://graph.microsoft.com/.default');
$req->AddParam('grant_type','client_credentials');

// Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
$url = 'https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token';
// resp is a CkHttpResponse
$resp = $http->PostUrlEncoded($url,$req);
if ($http->get_LastMethodSuccess() != true) {
    print $http->lastErrorText() . "\n";
    exit;
}

$statusCode = $resp->get_StatusCode();
print 'Response status code = ' . $statusCode . "\n";

$json = new CkJsonObject();
$json->Load($resp->bodyStr());

$json->put_EmitCompact(false);
print $json->emit() . "\n";

// Sample successful output:

// {
//   "token_type": "Bearer",
//   "expires_in": 3599,
//   "ext_expires_in": 3599,
//   "access_token": "eyJ0eX...K0jOERg"
// }

if ($statusCode == 200) {
    $json->WriteFile('qa_data/tokens/msGraphClientCredentialsToken.json');
    print 'Success.' . "\n";
}
else {
    print 'Failed.' . "\n";
}


?>