From 51fcbbe7f1e4698826059081304e95c1d525444a Mon Sep 17 00:00:00 2001
From: Moritz Strohm <strohm@data-quest.de>
Date: Fri, 21 Oct 2022 17:01:13 +0200
Subject: added initial code

---
 app/controllers/u.php                          | 45 +++++++++++++++
 app/views/u/add.php                            |  3 +
 composer.json                                  |  3 +-
 composer.lock                                  | 77 +++++++++++++++++++++++++-
 db/migrations/5.3.1.2_add_short_urls_table.php | 33 +++++++++++
 lib/models/ShortURL.php                        | 43 ++++++++++++++
 templates/footer.php                           |  8 +++
 7 files changed, 209 insertions(+), 3 deletions(-)
 create mode 100644 app/controllers/u.php
 create mode 100644 app/views/u/add.php
 create mode 100644 db/migrations/5.3.1.2_add_short_urls_table.php
 create mode 100644 lib/models/ShortURL.php

diff --git a/app/controllers/u.php b/app/controllers/u.php
new file mode 100644
index 0000000..a952dc4
--- /dev/null
+++ b/app/controllers/u.php
@@ -0,0 +1,45 @@
+<?php
+
+
+/**
+ * The U controller is responsible for short URLs. Therefore, it is just named "u" to not waste space.
+ */
+class UController extends AuthenticatedController
+{
+    /**
+     * The resolve action for a short URL. Shortened, to be short itself.
+     */
+    public function r_action($id)
+    {
+        $url = ShortURL::find($id);
+        if ($url) {
+            $this->redirect($url->url);
+        } else {
+            throw new AccessDeniedException(_('Die Kurz-URL ist ungültig!'));
+        }
+    }
+
+
+    public function add_action()
+    {
+        $short_url = new ShortURL();
+        $short_url->url = Request::get('from_url'); //TODO: Stud.IP-Pfad statt Server-Pfad
+        $short_url->user_id = $GLOBALS['user']->id;
+        $this->form = \Studip\Forms\Form::fromSORM(
+            $short_url,
+            [
+                'fields' => [
+                    'alias' => [
+                        'label' => _('URL-Bezeichnung'),
+                        'type' => 'text',
+                        'pattern' => '[a-záæäéèôøöü0-9\-]{4,256}'
+                    ],
+                    'url' => [
+                        'type' => 'hidden'
+                    ]
+                ]
+            ]
+        );
+        $this->form->autoStore();
+    }
+}
diff --git a/app/views/u/add.php b/app/views/u/add.php
new file mode 100644
index 0000000..ae35892
--- /dev/null
+++ b/app/views/u/add.php
@@ -0,0 +1,3 @@
+<? if (!empty($form)) : ?>
+    <?= $form->render() ?>
+<? endif ?>
diff --git a/composer.json b/composer.json
index f3fc0a4..6e960fe 100644
--- a/composer.json
+++ b/composer.json
@@ -56,6 +56,7 @@
         "symfony/process": "^5.4",
         "jumbojett/openid-connect-php": "^0.9.2",
         "league/oauth2-server": "^8.3",
-        "willdurand/negotiation": "^3.1"
+        "willdurand/negotiation": "^3.1",
+        "hashids/hashids": "^4.1"
     }
 }
diff --git a/composer.lock b/composer.lock
index 64a95d9..1b55e77 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "7a9043e1984ae4fb02e5872928486f0a",
+    "content-hash": "b51ee3affb9b9fa50c14c160dd62531c",
     "packages": [
         {
             "name": "algo26-matthias/idna-convert",
@@ -514,6 +514,76 @@
             "time": "2017-03-20T17:10:46+00:00"
         },
         {
+            "name": "hashids/hashids",
+            "version": "4.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/vinkla/hashids.git",
+                "reference": "8cab111f78e0bd9c76953b082919fc9e251761be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/vinkla/hashids/zipball/8cab111f78e0bd9c76953b082919fc9e251761be",
+                "reference": "8cab111f78e0bd9c76953b082919fc9e251761be",
+                "shasum": ""
+            },
+            "require": {
+                "ext-mbstring": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.0 || ^9.4",
+                "squizlabs/php_codesniffer": "^3.5"
+            },
+            "suggest": {
+                "ext-bcmath": "Required to use BC Math arbitrary precision mathematics (*).",
+                "ext-gmp": "Required to use GNU multiple precision mathematics (*)."
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Hashids\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ivan Akimov",
+                    "email": "ivan@barreleye.com"
+                },
+                {
+                    "name": "Vincent Klaiber",
+                    "email": "hello@doubledip.se"
+                }
+            ],
+            "description": "Generate short, unique, non-sequential ids (like YouTube and Bitly) from numbers",
+            "homepage": "https://hashids.org/php",
+            "keywords": [
+                "bitly",
+                "decode",
+                "encode",
+                "hash",
+                "hashid",
+                "hashids",
+                "ids",
+                "obfuscate",
+                "youtube"
+            ],
+            "support": {
+                "issues": "https://github.com/vinkla/hashids/issues",
+                "source": "https://github.com/vinkla/hashids/tree/4.1.0"
+            },
+            "time": "2020-11-26T19:24:33+00:00"
+        },
+        {
             "name": "jakeasmith/http_build_url",
             "version": "1.0.1",
             "source": {
@@ -7105,5 +7175,8 @@
         "ext-dom": "*"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.3.0"
+    "platform-overrides": {
+        "php": "7.2.5"
+    },
+    "plugin-api-version": "2.0.0"
 }
diff --git a/db/migrations/5.3.1.2_add_short_urls_table.php b/db/migrations/5.3.1.2_add_short_urls_table.php
new file mode 100644
index 0000000..dfa9eff
--- /dev/null
+++ b/db/migrations/5.3.1.2_add_short_urls_table.php
@@ -0,0 +1,33 @@
+<?php
+
+
+class AddShortUrlsTable extends Migration
+{
+    public function description()
+    {
+        return 'Adds the short_urls table.';
+    }
+
+
+    public function up()
+    {
+        $db = DBManager::get();
+        $db->exec(
+            "CREATE TABLE short_urls (
+                id int PRIMARY KEY NOT NULL AUTO_INCREMENT,
+                alias VARCHAR(256) UNIQUE NOT NULL DEFAULT '',
+                url VARCHAR(1024) NOT NULL,
+                user_id VARCHAR(32) NOT NULL DEFAULT '',
+                mkdate int(10) NOT NULL DEFAULT '0',
+                chdate int(10) NOT NULL DEFAULT '0'
+            )"
+        );
+    }
+
+
+    public function down()
+    {
+        $db = DBManager::get();
+        $db->exec("DROP TABLE short_urls");
+    }
+}
diff --git a/lib/models/ShortURL.php b/lib/models/ShortURL.php
new file mode 100644
index 0000000..3615e0b
--- /dev/null
+++ b/lib/models/ShortURL.php
@@ -0,0 +1,43 @@
+<?php
+
+
+use Hashids\Hashids;
+
+
+/**
+ * A SimpleORMap class for short URLs.
+ *
+ * @property string id The ID of the short URL.
+ * @property string alias
+ * @property string url The URL where the short URL leads to.
+ * @property string user_id The ID of the user who created the short URL.
+ * @property string mkdate The creation timestamp of the short URL.
+ * @property string chdate The modification timestamp of the short URL.
+ */
+class ShortURL extends SimpleORMap
+{
+    protected static function configure($config = [])
+    {
+        $config['db_table'] = 'short_urls';
+        $config['belongs_to']['user'] = [
+            'class_name' => User::class,
+            'foreign_key' => 'user_id'
+        ];
+        $config['registered_callbacks']['after_store'][] = 'cbGenerateAlias';
+
+        parent::configure($config);
+    }
+
+
+    public function cbGenerateAlias()
+    {
+        if (!$this->alias) {
+            //Generate the alias from the ID.
+            $hash_id = new Hashids($GLOBALS['UNI_NAME_CLEAN'], 8);
+            $this->alias = $hash_id->encode($this->id);
+            if ($this->isDirty()) {
+                $this->store();
+            }
+        }
+    }
+}
diff --git a/templates/footer.php b/templates/footer.php
index 86e0df3..71a37e7 100644
--- a/templates/footer.php
+++ b/templates/footer.php
@@ -36,6 +36,14 @@
 
 <? if (Navigation::hasItem('/footer')) : ?>
     <ul>
+        <li>
+            <? if (is_object($GLOBALS['user']) && $GLOBALS['user']->id !== 'nobody') : ?>
+                <a href="<?= URLHelper::getLink('dispatch.php/u/add', ['from_path' => $_SERVER['REQUEST_URI']]) ?>"
+                   data-dialog="size=default">
+                    <?= _('Kurz-URL') ?>
+                </a>
+            <? endif ?>
+        </li>
     <? foreach (Navigation::getItem('/footer') as $nav): ?>
         <? if ($nav->isVisible()): ?>
             <li>
-- 
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