new feature: webring

webring/index.php

@@ -0,0 +1,40 @@
+<?php
+
+$members = require 'members.php';
+$count = count($members);
+
+$action = $_GET['action'] ?? '';
+$ref = $_SERVER['HTTP_REFERER'];
+if (preg_match('/https\:\/\/tylda\.org\/\~[a-zA-Z0-9\-\_]+.*/', $ref)) {
+  $site = substr(explode('/', $ref)[3], 1);
+} else {
+  $site = $_GET['site'] ?? '';
+}
+
+$index = array_search($site, array_column($members, 'name'));
+
+if ($index === false) {
+  http_response_code(404);
+  die('Nieznana strona!');
+}
+
+switch ($action) {
+  case 'prev':
+    $target = $members[($index - 1 + $count) % $count];
+    break;
+  case 'next':
+    $target = $members[($index + 1) % $count];
+    break;
+  case 'random':
+    $r = rand(0, $count - 1);
+    $target = $members[$r];
+    break;
+  default:
+    http_response_code(400);
+    die('Brak akcji (prev/next/random)');
+}
+
+header('Location: ' . $target['url']);
+exit;
+
+?>