upgrade

plugin/lti_provider/db/lti13_cache.php

@@ -0,0 +1,59 @@
+<?php
+/* For license terms, see /license.txt */
+
+use Packback\Lti1p3\Interfaces\Cache as Lti1p3Cache;
+
+class Lti13Cache implements Lti1p3Cache
+{
+    public const NONCE_PREFIX = 'nonce_';
+
+    private $cache;
+
+    public function getLaunchData($key)
+    {
+        $this->loadCache();
+
+        return $this->cache[$key];
+    }
+
+    public function cacheLaunchData($key, $jwtBody): Lti13Cache
+    {
+        $this->cache[$key] = $jwtBody;
+        $this->saveCache();
+
+        return $this;
+    }
+
+    public function cacheNonce($nonce): Lti13Cache
+    {
+        $this->cache['nonce'][$nonce] = true;
+        $this->saveCache();
+
+        return $this;
+    }
+
+    public function checkNonce($nonce): bool
+    {
+        $this->loadCache();
+        if (!isset($this->cache['nonce'][$nonce])) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private function loadCache()
+    {
+        $cache = file_get_contents(api_get_path(SYS_ARCHIVE_PATH).'lti_cache.txt');
+        if (empty($cache)) {
+            file_put_contents(api_get_path(SYS_ARCHIVE_PATH).'lti_cache.txt', '{}');
+            $this->cache = [];
+        }
+        $this->cache = json_decode($cache, true);
+    }
+
+    private function saveCache()
+    {
+        file_put_contents(api_get_path(SYS_ARCHIVE_PATH).'lti_cache.txt', json_encode($this->cache));
+    }
+}