refactor: add metadata cache (#12)

Author: gao-sun

samples/index.php

@@ -26,7 +26,7 @@
     )
   );
 
-  switch ($_SERVER['PATH_INFO']) {
+  switch (parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)) {
     case '/':
     case null:
       if (!$client->isAuthenticated()) {

src/LogtoClient.php

@@ -64,7 +64,7 @@ class LogtoClient
 
   function __construct(public LogtoConfig $config, public Storage $storage = new SessionStorage())
   {
-    $this->oidcCore = OidcCore::create($config->endpoint);
+    $this->oidcCore = OidcCore::create(rtrim($config->endpoint, "/"));
   }
 
   /**

src/Oidc/OidcCore.php

@@ -10,6 +10,7 @@
 use Logto\Sdk\Models\OidcProviderMetadata;
 use Phpfastcache\CacheManager;
 use Firebase\JWT\JWT;
+use Phpfastcache\Helper\Psr16Adapter;
 
 /**
  * The core OIDC functions for the Logto client. Provider-agonistic functions
@@ -23,18 +24,29 @@ class OidcCore
 
   /**
    * Create a OidcCore instance for the given Logto endpoint using the discovery URL.
-   * Note it may take a few time to fetch the provider metadata since it will send a
-   * network request.
+   * 
+   * Note it may take a while to fetch the metadata from the endpoint for the first time.
+   * After that, the metadata will be cached for 1 hour.
    */
   static function create(string $logtoEndpoint): OidcCore
   {
+    $defaultDriver = 'Files';
+    $Psr16Adapter = new Psr16Adapter($defaultDriver);
     $client = new Client();
+    $cacheKey = 'logto_oidc_metadata.' . urlencode($logtoEndpoint);
+
+    if ($metadata = $Psr16Adapter->get($cacheKey)) {
+      return new OidcCore(new OidcProviderMetadata(...$metadata));
+    }
+
     $body = $client->get(
       $logtoEndpoint . '/oidc/.well-known/openid-configuration',
       ['headers' => ['user-agent' => '@logto/php', 'accept' => '*/*']]
     )->getBody()->getContents();
+    $metadata = json_decode($body, true);
+    $Psr16Adapter->set($cacheKey, $metadata, 3600);
 
-    return new OidcCore(new OidcProviderMetadata(...json_decode($body, true)));
+    return new OidcCore(new OidcProviderMetadata(...$metadata));
   }
 
   /** Generate a random string (32 bytes) for the state parameter. */