From 8f492f243275dace08d1a05915c27b52fed7a1aa Mon Sep 17 00:00:00 2001
From: Matthieu Bessat <spamfree@matthieubessat.fr>
Date: Sun, 3 Oct 2021 14:04:05 +0200
Subject: [PATCH] feat(UrlShortner): add module

---
 config.example.php                  |   5 +-
 index.php                           |  22 +-----
 modules/urlshortner/urlshortner.php | 115 ++++++++++++++++++++++++++++
 utils.php                           |  24 ++++++
 4 files changed, 144 insertions(+), 22 deletions(-)
 create mode 100644 modules/urlshortner/urlshortner.php

diff --git a/config.example.php b/config.example.php
index d3d4a6f..5118a3a 100644
--- a/config.example.php
+++ b/config.example.php
@@ -25,7 +25,10 @@ return [
     'baseconverter' => [
       'alias' => ['encode', 'decode']
     ],
-    'uuid' => []
+    'uuid' => [],
+    'urlshortner' => [
+      'alias' => ['u', 'url']
+    ]
   ],
   'auth' => [
     'root' => 'password'
diff --git a/index.php b/index.php
index e6b3892..30b28c5 100644
--- a/index.php
+++ b/index.php
@@ -51,27 +51,7 @@ if ($selectedModule === null) {
 generateHelp($selectedModule['key']);
 
 if (isset($selectedModule['auth']) && $selectedModule['auth']) {
-  if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW']))
-  {
-    header("WWW-Authenticate: Basic realm=\"You need to provide user and passwd\"");
-    http_response_code(401);
-    echo "Authentification Required";
-    exit();
-  }
-  $providedUsername = $_SERVER['PHP_AUTH_USER'];
-  $providedPassword = $_SERVER['PHP_AUTH_PW'];
-  $found = false;
-  foreach ($config['auth'] as $username => $password) {
-    if ($username === $providedUsername && $password == $providedPassword) {
-      $found = true;
-    }
-  }
-  if (!$found) {
-    header("WWW-Authenticate: Basic realm=\"Invalid auth\"");
-    http_response_code(401);
-    echo "Invalid authentification, try again";
-    exit();
-  }
+  askAuth($config['auth']);
 }
 
 require('./modules/' . $selectedModule['key'] . '/' . $selectedModule['key'] . '.php');
diff --git a/modules/urlshortner/urlshortner.php b/modules/urlshortner/urlshortner.php
new file mode 100644
index 0000000..5ea16f5
--- /dev/null
+++ b/modules/urlshortner/urlshortner.php
@@ -0,0 +1,115 @@
+<?php
+
+$path = __DIR__ . '/../../tmp/urlshortner';
+
+function saveUrls($urlsToStore) {
+  global $path;
+  $data = json_encode([
+    'updated_at' => date('Y-m-d H:i:s'),
+    'urls' => $urlsToStore
+  ]);
+  file_put_contents($path . '/urls.json', $data);
+}
+
+if (!file_exists($path)) {
+  mkdir($path);
+}
+
+if (!file_exists($path . '/urls.json') || file_get_contents($path . '/urls.json') === '') {
+  file_put_contents($path . '/urls.json', '{"urls": []}');
+}
+
+$urls = json_decode(file_get_contents($path . '/urls.json'), true)['urls'];
+
+if (strpos($_SERVER['REQUEST_URI'], '/admin') === 0) {
+  // admin panel
+  askAuth($config['auth']);
+
+  if (strpos($_SERVER['REQUEST_URI'], '/create') !== false) {
+    $url = [
+      'slug' => $_GET['slug'] ?? $_GET['name'] ?? '',
+      'target' => $_GET['target'] ?? '',
+      'created_at' => date('Y-m-d H:i:s')
+    ];
+    if (empty($url['slug']) || empty($url['target'])) {
+      echo "Invalid values slug or target";
+      http_response_code(400);
+      exit();
+    }
+    $urls[] = $url;
+
+    echo "Url was created";
+    saveUrls($urls);
+    if (isset($_GET['redirect'])) {
+      header('Location: ' . $_GET['redirect']);
+      http_response_code(302);
+    }
+    exit();
+  }
+  if (strpos($_SERVER['REQUEST_URI'], '/delete') !== false) {
+    if (!isset($_GET['slug']) || empty($_GET['slug'])) {
+      echo "Slug param missing";
+      http_response_code(400);
+      exit();
+    }
+    $urls = array_filter([], fn ($u) => $u['slug'] !== $_GET['slug']);
+    echo "The urls with this slug were deleted";
+
+    saveUrls($urls);
+    if (isset($_GET['redirect'])) {
+      header('Location: ' . $_GET['redirect']);
+    }
+    exit();
+  }
+  ?>
+  <h1>Url list</h1>
+  <b>Add a URL</b>
+  <form method="get" action="/admin/create">
+    <label for="slug">Slug</label>
+    <input type="text" name="slug" id="slug" />
+    
+    <br>
+    <label for="target">Target (link)</label>
+    <input type="url" name="target" id="target" style="min-width: 80%" />
+
+    <input type="hidden" name="redirect" value="/admin" />
+    <br>
+    <button>Create Shortcut</button>
+  </form>
+  <hr>
+  <div>
+  <?php
+  foreach ($urls as $url) {
+   ?>
+   <div 
+    style="
+      max-width: 900px;
+      display: flex;
+      justify-content: space-between;
+      border: 1px solid gray;
+      margin-bottom: .4em
+    ">
+      <div>
+        /<?= $url['slug'] ?> : <a href="<?= $url['target'] ?>"><?= $url['target'] ?></a>
+      </div>
+      <a href="/admin/delete?slug=<?= $url['slug'] ?>&redirect=/admin">Delete</a>
+    </div>
+   <?php
+  }
+  ?>
+  </div>
+  <?php
+  exit();
+}
+
+foreach ($urls as $url) {
+  if (strpos($_SERVER['REQUEST_URI'], '/' . $url['slug']) === 0) {
+    header('Location: ' . $url['target']);
+    http_response_code(302);
+    echo "You've been redirected";
+    exit();
+  }
+}
+
+http_response_code(404);
+echo 'ERR: Unknown url';
diff --git a/utils.php b/utils.php
index 15a690f..ff95ddc 100644
--- a/utils.php
+++ b/utils.php
@@ -64,3 +64,27 @@ function deleteAllFiles($path) {
   }
   return $count;
 }
+
+function askAuth($authConfig) {
+  if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW']))
+  {
+    header("WWW-Authenticate: Basic realm=\"You need to provide user and passwd\"");
+    http_response_code(401);
+    echo "Authentification Required";
+    exit();
+  }
+  $providedUsername = $_SERVER['PHP_AUTH_USER'];
+  $providedPassword = $_SERVER['PHP_AUTH_PW'];
+  $found = false;
+  foreach ($authConfig as $username => $password) {
+    if ($username === $providedUsername && $password == $providedPassword) {
+      $found = true;
+    }
+  }
+  if (!$found) {
+    header("WWW-Authenticate: Basic realm=\"Invalid auth\"");
+    http_response_code(401);
+    echo "Invalid authentification, try again";
+    exit();
+  }
+}