Mocked OIDC Discovery Response

oidc_discovery.php

<?php
/*
* (c) Lauritz Holtmann, https://security.lauritz-holtmann.de
*
* Could be for instance launched as follows:
* $ php -S 127.0.0.1:1234
* $ ngrok http 1234
*
* Visit https://something.ngrok.io/oidc_dicovery.php
*/

$issuer = "https://security.lauritz-holtmann.de";
$authorization_endpoint = "https://security.lauritz-holtmann.de/auth";
$token_endpoint = "https://security.lauritz-holtmann.de/token";
$userinfo_endpoint = "https://security.lauritz-holtmann.de/userinfo";
$introspection_endpoint = "https://security.lauritz-holtmann.de/introspection";
$jwks_uri = "https://security.lauritz-holtmann.de/jwks";
$registration_endpoint = "https://security.lauritz-holtmann.de/registration";

$data = array(
	"issuer" => $issuer,
	"authorization_endpoint" => $authorization_endpoint,
	"token_endpoint" => $token_endpoint,
	"userinfo_endpoint" => $userinfo_endpoint,
	"introspection_endpoint" => $introspection_endpoint,
	"jwks_uri" => $jwks_uri,
	"registration_endpoint" => $registration_endpoint,
	"response_types_supported" => array("code","token id_token"),
	"subject_types_supported" => array("public","pairwise"),
	"id_token_signing_alg_values_supported" => array("RS256") 
);

header('Content-Type: application/json; charset=utf-8');
die(json_encode($data));

If you want to serve the above PHP script using the built-in web server, you may need to create a custom router.php:

<?php
if (preg_match('/openid-configuration$/', $_SERVER['SCRIPT_NAME'])) {
  include(__DIR__ . $_SERVER['SCRIPT_NAME']);
  return;
}

// Default: serve the requested resource as-is.
return false;

You may then launch the server as follows:

$ php -S 127.0.0.1:1234 router.php