From ea1269577fcd9d9b05f4b29ae2ad0d7c4c9a6ca2 Mon Sep 17 00:00:00 2001
From: "David T. Sadler" <davidtsadler@googlemail.com>
Date: Thu, 8 Jul 2021 21:47:20 +0100
Subject: Shorten urls

---
 public/read/index.php | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 public/read/index.php

(limited to 'public/read')

diff --git a/public/read/index.php b/public/read/index.php
new file mode 100644
index 0000000..87857da
--- /dev/null
+++ b/public/read/index.php
@@ -0,0 +1,33 @@
+<?php declare(strict_types=1);
+
+error_reporting(E_ALL);
+
+require_once(__DIR__.'/../../includes/functions.php');
+
+$config = require_once(__DIR__.'/../../config.php');
+
+if ('GET' !== filter_input(INPUT_SERVER, 'REQUEST_METHOD')) {
+    respondAndExit(405, 'Method Not Allowed');
+}
+
+$requestedUrl = filter_input(INPUT_GET, 'url', FILTER_VALIDATE_URL);
+
+if (!$requestedUrl || strlen($requestedUrl) > $config['max_url_length']) {
+    respondAndExit(400, 'Bad Request');
+}
+
+$urls = file($config['path_to_file'], FILE_IGNORE_NEW_LINES);
+
+// Remove requested url from list if present.
+$remaingUrls = array_diff($urls, [$requestedUrl]);
+
+// Count will not have changed if requested url doesn't exist in the list.
+if (count($remaingUrls) === count($urls)) {
+    respondAndExit(404, 'Not Found');
+}
+
+if (!file_put_contents($config['path_to_file'], implode("\n", $remaingUrls))) {
+    respondAndExit(500, 'Internal Server Error');
+}
+
+respondAndExit(308, 'Permanent Redirect', ["Location: $requestedUrl"]);
-- 
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