Add Symfony Deprecation Contracts package

- Created CHANGELOG.md to maintain version history.
- Added README.md with usage instructions for the trigger_deprecation() function.
- Initialized composer.json for the Symfony Deprecation Contracts library, specifying dependencies and autoloading.

modules/pshowsso/deps/stevenmaguire/oauth2-keycloak/examples/index.php

@@ -0,0 +1,53 @@
+<?php
+
+require 'vendor/autoload.php';
+
+session_start();
+
+$provider = new Stevenmaguire\OAuth2\Client\Provider\Keycloak([
+    'authServerUrl'             => '',
+    'realm'                     => '',
+    'clientId'                  => '',
+    'clientSecret'              => '',
+    'redirectUri'               => '',
+    'encryptionAlgorithm'       => null,
+    'encryptionKey'             => null,
+    'encryptionKeyPath'         => null
+]);
+
+if (!isset($_GET['code'])) {
+    // If we don't have an authorization code then get one
+    $authUrl = $provider->getAuthorizationUrl();
+    $_SESSION['oauth2state'] = $provider->getState();
+    header('Location: '.$authUrl);
+    exit;
+
+// Check given state against previously stored one to mitigate CSRF attack
+} elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {
+    unset($_SESSION['oauth2state']);
+    exit('Invalid state, make sure HTTP sessions are enabled.');
+} else {
+    // Try to get an access token (using the authorization coe grant)
+    try {
+        $token = $provider->getAccessToken('authorization_code', [
+            'code' => $_GET['code']
+        ]);
+    } catch (Exception $e) {
+        exit('Failed to get access token: '.$e->getMessage());
+    }
+
+    // Optional: Now you have a token you can look up a users profile data
+    try {
+
+        // We got an access token, let's now get the user's details
+        $user = $provider->getResourceOwner($token);
+        // Use these details to create a new profile
+        printf('Hello %s!\n<br>', $user->getName());
+
+    } catch (Exception $e) {
+        exit('Failed to get resource owner: '.$e->getMessage());
+    }
+
+    // Use this to interact with an API on the users behalf
+    echo $token->getToken();
+}