Suport standard HTTP 410 Gone (#3561)

When a feed returns an HTTP 410 Gone, mute the corresponding feed, i.e. stop refreshing it.
Example of such feed, Les Décodeurs (Libération) https://rss.liberation.fr/rss/100893/

2 files changed, 21 insertions, 0 deletions

diff --git a/lib/SimplePie/SimplePie.php b/lib/SimplePie/SimplePie.php
index 6a542e2c5..66171dea3 100644
--- a/lib/SimplePie/SimplePie.php
+++ b/lib/SimplePie/SimplePie.php
@@ -431,6 +431,13 @@ class SimplePie
 	public $error;
 
 	/**
+	 * @var int HTTP status code
+	 * @see SimplePie::status_code()
+	 * @access private
+	 */
+	public $status_code;
+
+	/**
 	 * @var object Instance of SimplePie_Sanitize (or other class)
 	 * @see SimplePie::set_sanitize_class()
 	 * @access private
@@ -1677,6 +1684,7 @@ class SimplePie
 					}
 
 					$file = $this->registry->create('File', array($this->feed_url, $this->timeout, 5, $headers, $this->useragent, $this->force_fsockopen, $this->curl_options, $this->syslog_enabled));
+					$this->status_code = $file->status_code;
 
 					if ($file->success)
 					{
@@ -1733,6 +1741,8 @@ class SimplePie
 				$file = $this->registry->create('File', array($this->feed_url, $this->timeout, 5, $headers, $this->useragent, $this->force_fsockopen, $this->curl_options, $this->syslog_enabled));
 			}
 		}
+		$this->status_code = $file->status_code;
+
 		// If the file connection has an error, set SimplePie::error to that and quit
 		if (!$file->success && !($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($file->status_code === 200 || $file->status_code > 206 && $file->status_code < 300)))
 		{
@@ -1843,6 +1853,16 @@ class SimplePie
 	}
 
 	/**
+	 * Get the last HTTP status code
+	 *
+	 * @return int Status code
+	 */
+	public function status_code()
+	{
+		return $this->status_code;
+	}
+
+	/**
 	 * Get the raw XML
 	 *
 	 * This is the same as the old `$feed->enable_xml_dump(true)`, but returns
diff --git a/lib/SimplePie/SimplePie/File.php b/lib/SimplePie/SimplePie/File.php
index 7c7078cc5..0cb3b7861 100644
--- a/lib/SimplePie/SimplePie/File.php
+++ b/lib/SimplePie/SimplePie/File.php
@@ -123,6 +123,7 @@ class SimplePie_File
 					curl_setopt($fp, CURLOPT_ENCODING, 'none');
 					$this->headers = curl_exec($fp);
 				}
+				$this->status_code = curl_getinfo($fp, CURLINFO_HTTP_CODE);
 				if (curl_errno($fp))
 				{
 					$this->error = 'cURL error ' . curl_errno($fp) . ': ' . curl_error($fp);