init

.gitignore

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+vendor/
+providerConfig.php

callback.php

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+<?php
+#error_reporting(E_ALL);
+#ini_set('display_errors', 1);
+
+
+session_start();
+
+$provider = require 'providerConfig.php';
+
+try {
+    if (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {
+        unset($_SESSION['oauth2state']);
+        throw new Exception('Invalid state');
+    }
+
+    $token = $provider->getAccessToken('authorization_code', [
+        'code' => $_GET['code']
+    ]);
+
+    $resourceOwner = $provider->getResourceOwner($token);
+    $userData = $resourceOwner->toArray();
+
+
+    // Save user data and token in session or database here
+    $_SESSION['user'] = $userData["name"];
+    $_SESSION['token'] = $token->getToken();
+
+    // Redirect to index.php
+    header('Location: index.php');
+    exit();
+
+} catch (Exception $e) {
+    // Log the error message and display a generic error message to the user
+    error_log($e->getMessage());
+    echo '<p>An error occurred during the login process. Please try again.</p>';
+    echo '<p><a href="index.php">Try again</a></p>';
+}

composer.json

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+{
+    "require": {
+        "league/oauth2-client": "^2.7"
+    }
+}