(PHP Extension) Azure Key Vault Get OAuth2 Access Token using Client Credentials

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Demonstrates how to get an OAuth2 access token using client credentials for an Azure Key Vault resource.

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<?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.

// You can use OAuth2 client credentials with an Azure App (service principal) that has
// the required Role-Based Access Control (RBAC) permissions.
// In this case, it would be service principal with RBAC permissions to administer and manage
// the key vault.

// You can create the Azure App (also known as the Service Principal)
// in the Azure CLI (command line interface) as follows:

// ----------------------------------------------------------------------
// az ad sp create-for-rbac --name http://example.com --role Contributor
// ----------------------------------------------------------------------

// The argument to --name must be a valid URI that is a verified domain of your 
// organization or its subdomain.

// The output of the above "az ad sp create-for-rbac ..." command is JSON such as this:

// {
//   "appId": "25ac6e3a-9ac7-42b9-b13e-18644c1de959",
//   "displayName": "azure-cli-2023-10-14-22-38-15",
//   "name": "http://example.com",
//   "password": "f1f2f3f0-52dc-4236-8295-c8a1d6aa393c",
//   "tenant": "4d8dfd66-68d1-13b0-af5c-b31b4b3d53d"
// }

// Save the values in the above JSON.  You'll need it below..

// You'll also want to add the role of "Key Vault Administrator" to the Service Principal
// for the particular key vault.

// ----------------------------------------------------------------------
// az role assignment create --assignee <Application-ID> --role "Key Vault Administrator" 
//       --scope /subscriptions/<Subscription-ID>/resourceGroups/<Resource-Group-Name>/providers/Microsoft.KeyVault/vaults/<KeyVault-Name>
// ----------------------------------------------------------------------

$http = new CkHttp();
$req = new CkHttpRequest();

// Add query params to the request.
$req->AddParam('grant_type','client_credentials');

// Use the service principal's appId
$req->AddParam('client_id','25ac6e3a-9ac7-42b9-b13e-18644c1de959');

// Use the service principal's password.
$req->AddParam('client_secret','f1f2f3f0-52dc-4236-8295-c8a1d6aa393c');

// Note: The resource must match the API for which you're using the access token..
$req->AddParam('resource','https://vault.azure.net');

$http->SetUrlVar('tenant','4d8dfd66-68d1-13b0-af5c-b31b4b3d53d');
// resp is a CkHttpResponse
$resp = $http->PostUrlEncoded('https://login.microsoftonline.com/{$tenant}/oauth2/token',$req);
if ($http->get_LastMethodSuccess() != true) {
    print $http->lastErrorText() . "\n";
    exit;
}

$strRespBody = $resp->bodyStr();
$respStatusCode = $resp->get_StatusCode();
if ($respStatusCode >= 400) {
    print 'Response Status Code = ' . $respStatusCode . "\n";
    print 'Response Body:' . "\n";
    print $strRespBody . "\n";

    exit;
}

$jsonResp = new CkJsonObject();
$jsonResp->Load($strRespBody);
$jsonResp->put_EmitCompact(false);
print $jsonResp->emit() . "\n";

// The result is an access token such as the following:

// {
//   "token_type": "Bearer",
//   "expires_in": "3600",
//   "ext_expires_in": "3600",
//   "expires_on": "1557864616",
//   "not_before": "1557860716",
//   "resource": "https://vault.azure.net",
//   "access_token": "eyJ0eXAiOiJKV1QiL ... 20UFDDOHEyUg"
// }

// If you wish, you can save the token to a file.
// The access token is generally valid for 1 hour.
// After 1 hour, you would need to get a new access token in the same way.
$jsonResp->WriteFile('qa_data/tokens/azureKeyVaultToken.json');


?>