add HandShakeHandler

Author: killtw

src/Websocket/HandShakeHandler.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace SwooleTW\Http\Websocket;
+
+/**
+ * Class HandShakeHandler
+ */
+class HandShakeHandler
+{
+    /**
+     * @see https://www.swoole.co.uk/docs/modules/swoole-websocket-server
+     *
+     * @param \Swoole\Http\Request $request
+     * @param \Swoole\Http\Response $response
+     *
+     * @return bool
+     */
+    public function handle($request, $response)
+    {
+        $socketkey = $request->header['sec-websocket-key'];
+
+        if (0 === preg_match('#^[+/0-9A-Za-z]{21}[AQgw]==$#', $socketkey) || 16 !== strlen(base64_decode($socketkey))) {
+            $response->end();
+
+            return false;
+        }
+
+        $headers = [
+            'Upgrade' => 'websocket',
+            'Connection' => 'Upgrade',
+            'Sec-WebSocket-Accept' => base64_encode(sha1($socketkey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true)),
+            'Sec-WebSocket-Version' => '13',
+        ];
+
+        if (isset($request->header['sec-websocket-protocol'])) {
+            $headers['Sec-WebSocket-Protocol'] = $request->header['sec-websocket-protocol'];
+        }
+
+        foreach ($headers as $header => $val) {
+            $response->header($header, $val);
+        }
+
+        $response->status(101);
+        $response->end();
+
+        return true;
+    }
+}