update chat

php/chat/relay.php

@@ -0,0 +1,35 @@
+<?php
+if (!isset($_GET['user'])) {
+    http_response_code(400);
+    exit("Missing user");
+}
+
+$user = preg_replace('/[^a-zA-Z0-9_-]/', '', $_GET['user']);
+header("Content-Type: text/event-stream");
+header("Cache-Control: no-cache");
+header("Connection: keep-alive");
+
+$tmp_file = sys_get_temp_dir() . "/relay_chat_{$user}.txt";
+
+if (!file_exists($tmp_file)) {
+    file_put_contents($tmp_file, '');
+}
+
+$last_modif = 0;
+
+while (true) {
+    clearstatcache();
+    $current_modif = filemtime($tmp_file);
+
+    if ($current_modif > $last_modif) {
+        $last_modif = $current_modif;
+        $data = file_get_contents($tmp_file);
+        echo "data: " . trim($data) . "\n\n";
+        ob_flush();
+        flush();
+    }
+
+    sleep(1);
+}
+?>
+