initial commit

.gitignore

@@ -0,0 +1 @@
+/vendor/

composer.json

@@ -0,0 +1,12 @@
+{
+    "name": "twisterarmy/twister",
+    "description": "PHP 8 / Composer Tools for Twister API",
+    "type": "library",
+    "license": "MIT",
+    "autoload": {
+        "psr-4": {
+            "Twisterarmy\\Twister\\": "src/"
+        }
+    },
+    "require": {}
+}

src/Rss.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Twisterarmy\Twister;
+
+class Rss
+{
+    private int $_length = 256;
+
+    private string $_format = '{title} {link}';
+
+    public function setLength(int $value)
+    {
+        $this->_length = $value;
+    }
+
+    public function setFormat(string $value)
+    {
+        $this->_format = $value;
+    }
+
+    public function get(string $url, array &$error = []): ?array
+    {
+        if (empty($url))
+        {
+            $error[] = _('RSS address required!');
+
+            return null;
+        }
+
+        if (false === (bool) filter_var($url, FILTER_VALIDATE_URL))
+        {
+            $error[] = _('Valid RSS address required!');
+
+            return null;
+        }
+
+        if (!$xml = simplexml_load_file($url))
+        {
+            $error[] = sprintf(
+                'Could not open RSS feed "%s"',
+                $url
+            );
+
+            return null;
+        }
+
+        if (empty($xml->channel))
+        {
+            $error[] = _('RSS channel not found!');
+
+            return null;
+        }
+
+        if (empty($xml->channel->item))
+        {
+            $error[] = _('RSS channel item not found!');
+
+            return null;
+        }
+
+        $messages = [];
+
+        foreach ($xml->channel->item as $item)
+        {
+            if (empty($item->link))
+            {
+                $error[] = _('RSS channel item does not contain link!');
+
+                continue;
+            }
+
+            if (empty($item->title))
+            {
+                $error[] = _('RSS channel item does not contain title!');
+
+                continue;
+            }
+
+            $link = trim(
+                (string) $item->link
+            );
+
+            $title = trim(
+                strip_tags(
+                    html_entity_decode(
+                        (string) $item->title
+                    )
+                )
+            );
+
+            $message = str_replace(
+                [
+                    '{link}',
+                    '{title}',
+                    // ..
+                ],
+                [
+                    $link,
+                    $title,
+                    // ..
+                ],
+                $this->_format
+            );
+
+            if (mb_strlen($message) > $this->_length)
+            {
+                $error[] = _('Message does not correspond twister protocol length!');
+
+                continue;
+            }
+
+            $messages[mb_strlen($message)] = $message;
+        }
+
+        return $messages;
+    }
+}