(Perl) 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 Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

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

$http = chilkat::CkHttp->new();

$req = chilkat::CkHttpRequest->new();
$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 HttpResponse
$resp = $http->PostUrlEncoded($url,$req);
if ($http->get_LastMethodSuccess() != 1) {
    print $http->lastErrorText() . "\r\n";
    exit;
}

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

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

$json->put_EmitCompact(0);
print $json->emit() . "\r\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." . "\r\n";
}
else {
    print "Failed." . "\r\n";
}