Extracted middleware and handlers

2024-03-10 20:22:28 +01:00
parent 83c34f4a47
commit 39869d605c
8 changed files with 592 additions and 416 deletions
--- a/src/Http/Middleware/ApiHandler.php
+++ b/src/Http/Middleware/ApiHandler.php
@ -0,0 +1,110 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Http\Middleware;
+
+use NoccyLabs\Mercureact\Broker\TopicManager;
+use NoccyLabs\Mercureact\Configuration;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use React\Http\Message\Response;
+use React\Promise\Promise;
+use React\Promise\PromiseInterface;
+
+class ApiHandler
+{
+
+    public static string $indexPage;
+
+    public function __construct(
+        private Configuration $config,
+        private TopicManager $topicManager
+    )
+    {
+    }
+
+    /**
+     * 
+     * 
+     * @param ServerRequestInterface $request
+     * @param callable $next
+     * @return PromiseInterface
+     */
+    public function __invoke(ServerRequestInterface $request, callable $next): PromiseInterface
+    {
+        return new Promise(
+            function (callable $resolve, callable $reject) use ($next, $request) {
+
+                $path = $request->getUri()->getPath();
+
+                if ($path === "/index.html") {
+                    $resolve(Response::html(self::$indexPage));
+                }
+
+                switch (true) {
+                    case preg_match('<^/.well-known/mercure/subscriptions(/.+?)$>', $path, $m):
+                        $query = explode("/", trim($m[1]??null, "/"));
+                        $topic = array_shift($query);
+                        $subscription = array_shift($query);
+                        $resolve($this->apiGetSubscriptions($topic, $subscription));
+                        return;
+                
+                    case preg_match('<^/.well-known/mercureact/status$>', $path):
+                        $resolve([
+                            'server' => 'Mercureact/1.0',
+                            'topics' => $this->topicManager->getTopicCount(),
+                            'subscriptions' => $this->topicManager->getSubscriberCount(),
+                            'memoryPeak' => memory_get_peak_usage(true),
+                            'memoryUsage' => memory_get_usage(true)
+                        ]);
+                        return;
+    
+                    case preg_match('<^/.well-known/mercureact/status$>', $path):
+                        $resolve([ 'version' => '1.0' ]);
+                        return;
+                }
+
+                $resolve($next($request));
+            }
+        );
+    }
+
+    /**
+     * 
+     * 
+     * @return ResponseInterface
+     */
+    private function apiGetSubscriptions(string|null $topic, string|null $subscription): ResponseInterface
+    {
+        // TODO implement once we can enumerate topics and subscriptions
+
+        // mock data
+        $lastEventId = "urn:uuid:5e94c686-2c0b-4f9b-958c-92ccc3bbb4eb";
+        $data = [
+            "@context" => "https://mercure.rocks/",
+            "id" => "/.well-known/mercure/subscriptions",
+            "type" => "Subscriptions",
+            "lastEventID" => $lastEventId,
+            "subscriptions" => []
+        ];
+
+        return Response::json($data)
+            ->withHeader('Content-Type', 'application/ld+json')
+            ->withHeader('ETag', $lastEventId);
+    }
+
+}
+
+
+ApiHandler::$indexPage = <<<ENDHTML
+<html>
+<head>
+<meta http-equiv="Content-Security-Policy" content="default-src 'self' http: 'unsafe-eval' 'unsafe-inline'; style-src 'self';">
+</head>
+<body>
+<script type="text/javascript">
+  const events = new EventSource("http://127.0.0.1:9000/.well-known/mercure");
+  events.onmessage = msg => console.log(msg);
+</script>
+</body>
+</html>
+ENDHTML;