[MastodonBridge] Add support for various platforms (#3133)

* [MastodonBridge] Add support for various platforms

* [MastodonBridge] satisfy the lint

Author: austinhuang0131

bridges/MastodonBridge.php

@@ -12,8 +12,8 @@ class MastodonBridge extends BridgeAbstract
     const NAME = 'ActivityPub Bridge';
     const CACHE_TIMEOUT = 900; // 15mn
     const DESCRIPTION = 'Returns recent statuses. Supports Mastodon, Pleroma and Misskey, among others. Access to
-	instances that have Authorized Fetch enabled requires
-	<a href="https://rss-bridge.github.io/rss-bridge/Bridge_Specific/ActivityPub_(Mastodon).html">configuration</a>.';
+    instances that have Authorized Fetch enabled requires
+    <a href="https://rss-bridge.github.io/rss-bridge/Bridge_Specific/ActivityPub_(Mastodon).html">configuration</a>.';
     const URI = 'https://mastodon.social';
 
     // Some Mastodon instances use Secure Mode which requires all requests to be signed.
@@ -38,34 +38,38 @@ class MastodonBridge extends BridgeAbstract
         'norep' => [
             'name' => 'Without replies',
             'type' => 'checkbox',
-            'title' => 'Only return statuses that are not replies, as determined by relations (not mentions).'
+            'title' => 'Hide replies, as determined by relations (not mentions).'
         ],
         'noboost' => [
             'name' => 'Without boosts',
-            'required' => false,
             'type' => 'checkbox',
-            'title' => 'Hide boosts. Note that RSS-Bridge will fetch the original status from other federated instances.'
+            'title' => 'Hide boosts. This will reduce loading time as RSS-Bridge fetches the boosted status from other federated instances.'
         ],
         'signaturetype' => [
             'type' => 'list',
             'name' => 'Signature Type',
-            'title' => 'How to sign requests when fetching from Authorized Fetch enabled instances',
+            'title' => 'How to sign requests when fetching from instances.
+                Defaults to "nosig" for RSS-Bridge instances that did not set up signatures.',
             'values' => [
                 'Without Query (Mastodon)' => 'noquery',
                 'With Query (GoToSocial)' => 'query',
+                'Don\'t sign' => 'nosig',
             ],
             'defaultValue' => 'noquery'
         ],
     ]];
 
     public function collectData()
     {
-        $url = $this->getURI() . '/outbox?page=true';
-        $content = $this->fetchAP($url);
-        if ($content['id'] !== $url) {
-            throw new \Exception('Unexpected response from server.');
+        $user = $this->fetchAP($this->getURI());
+        $content = $this->fetchAP($user['outbox']);
+        if (is_array($content['first'])) { // mobilizon
+            $content = $content['first'];
+        } else {
+            $content = $this->fetchAP($content['first']);
         }
-        foreach ($content['orderedItems'] as $status) {
+        $items = $content['orderedItems'] ?? $content['items'];
+        foreach ($items as $status) {
             $item = $this->parseItem($status);
             if ($item) {
                 $this->items[] = $item;
@@ -104,15 +108,26 @@ protected function parseItem($content)
                     $item['uri'] = $content['object'];
                 }
                 break;
+            case 'Note': // frendica posts
+                if ($this->getInput('norep') && isset($content['inReplyTo'])) {
+                    return null;
+                }
+                $item['title'] = '';
+                $item['author'] = $this->getInput('canusername');
+                $item = $this->parseObject($content, $item);
+                break;
             case 'Create': // posts
                 if ($this->getInput('norep') && isset($content['object']['inReplyTo'])) {
                     return null;
                 }
-                $item['author'] = $this->getInput('canusername');
                 $item['title'] = '';
+                $item['author'] = $this->getInput('canusername');
                 $item = $this->parseObject($content['object'], $item);
+                break;
+            default:
+                return null;
         }
-        $item['timestamp'] = $content['published'];
+        $item['timestamp'] = $content['published'] ?? $item['timestamp'];
         $item['uid'] = $content['id'];
         return $item;
     }
@@ -127,13 +142,20 @@ protected function parseObject($object, $item)
         $item['content'] = $object['content'];
         $strippedContent = strip_tags(str_replace('<br>', ' ', $object['content']));
 
-        if (mb_strlen($strippedContent) > 75) {
+        if (isset($object['name'])) {
+            $item['title'] = $object['name'];
+        } else if (mb_strlen($strippedContent) > 75) {
             $contentSubstring = mb_substr($strippedContent, 0, mb_strpos(wordwrap($strippedContent, 75), "\n"));
             $item['title'] .= $contentSubstring . '...';
         } else {
             $item['title'] .= $strippedContent;
         }
         $item['uri'] = $object['id'];
+        $item['timestamp'] = $object['published'];
+
+        if (!isset($object['attachment'])) {
+            return $item;
+        }
 
         if (isset($object['attachment']['url'])) {
             // Normalize attachment (turn single attachment into array)
@@ -214,6 +236,7 @@ protected function fetchAP($url)
 
             // Exclude query string when parsing URL
             'noquery' => '/https?:\/\/([a-z0-9-\.]{0,})(\/[^#?]+)/',
+            'nosig' => '/https?:\/\/([a-z0-9-\.]{0,})(\/[^#?]+)/',
         ];
 
         preg_match($regex[$this->getInput('signaturetype')], $url, $matches);
@@ -224,7 +247,7 @@ protected function fetchAP($url)
         ];
         $privateKey = $this->getOption('private_key');
         $keyId = $this->getOption('key_id');
-        if ($privateKey && $keyId) {
+        if ($privateKey && $keyId && $this->getInput('signaturetype') !== 'nosig') {
             $pkey = openssl_pkey_get_private('file://' . $privateKey);
             $toSign = '(request-target): get ' . $matches[2] . "\nhost: " . $matches[1] . "\ndate: " . $date;
             $result = openssl_sign($toSign, $signature, $pkey, 'RSA-SHA256');