1 files changed, 23 insertions, 0 deletions
diff --git a/phpBB/phpbb/path_helper.php b/phpBB/phpbb/path_helper.php
index f6587fa101..cd4c20bb7d 100644
--- a/phpBB/phpbb/path_helper.php
+++ b/phpBB/phpbb/path_helper.php
@@ -207,4 +207,27 @@ class path_helper
 
 		return generate_board_url() . $url;
 	}
+
+	/**
+	* Eliminates useless . and .. components from specified URL
+	*
+	* @param string $url URL to clean
+	*
+	* @return string Cleaned URL
+	*/
+	public function clean_url($url)
+	{
+		$delimiter_position = strpos($url, '://');
+		// URL should contain :// but it shouldn't start with it.
+		// Do not clean URLs that do not fit these constraints.
+		if (empty($delimiter_position))
+		{
+			return $url;
+		}
+		$scheme = substr($url, 0, $delimiter_position) . '://';
+		// Add length of URL delimiter to position
+		$path = substr($url, $delimiter_position + 3);
+
+		return $scheme . $this->filesystem->clean_path($path);
+	}
 }