fix rss parser; add debug mode

README.md

@@ -15,6 +15,8 @@ $ cp config.ini.dist config.ini
 Example of `config.ini` :
 
 ```ini
+debug = false
+
 [feed]
 url = "https://www.example.com/feed/"
 

index.php

@@ -2,48 +2,65 @@
 
 chdir(__DIR__);
 
-$options = getopt("c:");
+$options = getopt('c:');
 
 $config = parse_ini_file($options['c'] ?? 'config.ini', true);
 
+$debug = (bool) ($config['debug'] ?? false);
 $feedUrl = $config['feed']['url'];
 $hookUrl = $config['mattermost']['hook_url'];
 $cacheFile = $config['cache']['file'];
 $template = $config['mattermost']['message_template'];
-
+$cache = [];
+$commands = [];
 
 if (file_exists($cacheFile)) {
     $cache = json_decode(file_get_contents($cacheFile), true);
 
-    if ($cache === null) {
+    if (null === $cache) {
         $cache = [];
     }
 }
 
-$feedContent = file_get_contents($feedUrl);
+$xml = simplexml_load_file($feedUrl);
+$entries = array_merge($xml->xpath('//entry'), $xml->xpath('//item'));
 
-preg_match_all('#<title><!\[CDATA\[(.*)\]\]></title>#isU', $feedContent, $titles, PREG_SET_ORDER);
-preg_match_all('#<link>(.*)</link>#isU', $feedContent, $links, PREG_SET_ORDER);
+foreach ($entries as $entry) {
+    $title = (string) $entry->title;
+    $url = null;
 
-$commands = [];
+    foreach ($entry->link as $link) {
+        if (null !== $url) {
+            continue;
+        }
 
-foreach ($titles as $key => $title) {
-    $link = $links[$key] ?? null;
+        $attributes = $link->attributes();
+        $content = (string) $link;
+        $href = (string) ($attributes['href'] ?? '');
+        $type = (string) ($attributes['type'] ?? '');
 
-    if (!$link) {
+        if ('' !== $type && 'text/html' !== $type) {
+            continue;
+        }
+
+        if ('' !== $href) {
+            $url = $href;
+        } elseif ('' !== $content) {
+            $url = $content;
+        }
+    }
+
+    if (empty($url)) {
         continue;
     }
 
-    $title = $title[1];
-    $link = $link[1];
-
-    $hash = md5($title.$link);
+    $hash = md5($title.$url);
 
     if (!isset($cache[$hash])) {
         $cache[$hash] = true;
 
         $json = json_encode([
-            'text' => sprintf($template, $title, $link),
+            'text' => sprintf($template, $title, $url),
         ]);
 
         $commands[] = sprintf(
@@ -54,8 +71,14 @@ foreach ($titles as $key => $title) {
     }
 }
 
-file_put_contents($cacheFile, json_encode($cache));
+if (!$debug) {
+    file_put_contents($cacheFile, json_encode($cache));
+}
 
 foreach ($commands as $command) {
-    shell_exec($command);
+    if ($debug) {
+        echo $command, "\n";
+    } else {
+        shell_exec($command);
+    }
 }