[YandexZenBridge] Fix broken bridge for some channels (#4078)

Fixes #4071.

Major changes:
- the bridge's URI changed from zen.yandex.com to dzen.ru, as the former
  redirects to the latter (perhaps the bridge's name should be changed
  as well);
- the channel's URL is now required instead of the channel's username;
- two kinds of URLs are supported, one for channels with usernames and
  one for channels with IDs in their URL;
- the channel's real name, as shown in the webpage, is now used as the
  feed title.

bridges/YandexZenBridge.php

@@ -3,17 +3,17 @@
 class YandexZenBridge extends BridgeAbstract
 {
     const NAME = 'YandexZen Bridge';
-    const URI = 'https://zen.yandex.com';
+    const URI = 'https://dzen.ru';
-    const DESCRIPTION = 'Latest posts from the specified profile.';
+    const DESCRIPTION = 'Latest posts from the specified channel.';
     const MAINTAINER = 'llamasblade';
     const PARAMETERS = [
         [
-            'username' => [
+            'channelURL' => [
-                'name' => 'Username',
+                'name' => 'Channel URL',
                 'type' => 'text',
                 'required' => true,
-                'title' => 'The account\'s username, found in its URL',
+                'title' => 'The channel\'s URL',
-                'exampleValue' => 'dream_faity_diy',
+                'exampleValue' => 'https://dzen.ru/dream_faity_diy',
             ],
             'limit' => [
                 'name' => 'Limit',
@@ -27,14 +27,41 @@ class YandexZenBridge extends BridgeAbstract
     ];
 
     # credit: https://github.com/teromene see #1032
-    const _API_URL = 'https://zen.yandex.ru/api/v3/launcher/more?channel_name=';
+    const _BASE_API_URL_WITH_CHANNEL_NAME = 'https://dzen.ru/api/v3/launcher/more?channel_name=';
+    const _BASE_API_URL_WITH_CHANNEL_ID = 'https://dzen.ru/api/v3/launcher/more?channel_id=';
+
+    const _ACCOUNT_URL_WITH_CHANNEL_ID_REGEX = '#^https?://dzen\.ru/id/(?<channelID>[a-z0-9]{24})#';
+    const _ACCOUNT_URL_WITH_CHANNEL_NAME_REGEX = '#^https?://dzen\.ru/(?<channelName>[\w\.]+)#';
+
+    private $channelRealName = null;  # as shown in the webpage, not in the URL
+
 
     public function collectData()
     {
-        $profile_json = json_decode(getContents($this->getAPIUrl()));
+        $channelURL = $this->getInput('channelURL');
+
+        if (preg_match(self::_ACCOUNT_URL_WITH_CHANNEL_ID_REGEX, $channelURL, $matches)) {
+            $channelID = $matches['channelID'];
+            $channelAPIURL = self::_BASE_API_URL_WITH_CHANNEL_ID . $channelID;
+        } elseif (preg_match(self::_ACCOUNT_URL_WITH_CHANNEL_NAME_REGEX, $channelURL, $matches)) {
+            $channelName = $matches['channelName'];
+            $channelAPIURL = self::_BASE_API_URL_WITH_CHANNEL_NAME . $channelName;
+        } else {
+            returnClientError(<<<EOT
+Invalid channel URL provided.
+The channel\'s URL must be in one of these two forms:
+- https://dzen.ru/dream_faity_diy
+- https://dzen.ru/id/5ad7777f1aa80ce576015250
+EOT);
+        }
+
+        $APIResponse = json_decode(getContents($channelAPIURL));
+
+        $this->channelRealName = $APIResponse->header->title;
+
         $limit = $this->getInput('limit');
 
-        foreach (array_slice($profile_json->items, 0, $limit) as $post) {
+        foreach (array_slice($APIResponse->items, 0, $limit) as $post) {
             $item = [];
 
             $item['uri'] = $post->share_link;
@@ -56,21 +83,19 @@ class YandexZenBridge extends BridgeAbstract
         }
     }
 
-    private function getAPIUrl()
-    {
-        return self::_API_URL . $this->getInput('username');
-    }
-
     public function getURI()
     {
-        return self::URI . '/' . $this->getInput('username');
+        if (is_null($this->getInput('channelURL'))) {
+            return parent::getURI();
+        }
+        return $this->getInput('channelURL');
     }
 
     public function getName()
     {
-        if (is_null($this->getInput('username'))) {
+        if (is_null($this->channelRealName)) {
             return parent::getName();
         }
-        return $this->getInput('username') . '\'s latest zen.yandex posts';
+        return $this->channelRealName . '\'s latest zen.yandex posts';
     }
 }