1 files changed, 112 insertions, 20 deletions
diff --git a/phpBB/phpbb/path_helper.php b/phpBB/phpbb/path_helper.php
index a5314d2ce1..a8592eac6c 100644
--- a/phpBB/phpbb/path_helper.php
+++ b/phpBB/phpbb/path_helper.php
@@ -24,6 +24,9 @@ class path_helper
 	/** @var \phpbb\filesystem */
 	protected $filesystem;
 
+	/** @var \phpbb\request\request_interface */
+	protected $request;
+
 	/** @var string */
 	protected $phpbb_root_path;
 
@@ -41,13 +44,16 @@ class path_helper
 	*
 	* @param \phpbb\symfony_request $symfony_request
 	* @param \phpbb\filesystem $filesystem
+	* @param \phpbb\request\request_interface $request
 	* @param string $phpbb_root_path Relative path to phpBB root
 	* @param string $php_ext PHP extension (php)
+	* @param mixed $adm_relative_path Relative path admin path to adm/ root
 	*/
-	public function __construct(\phpbb\symfony_request $symfony_request, \phpbb\filesystem $filesystem, $phpbb_root_path, $php_ext, $adm_relative_path = null)
+	public function __construct(\phpbb\symfony_request $symfony_request, \phpbb\filesystem $filesystem, \phpbb\request\request_interface $request, $phpbb_root_path, $php_ext, $adm_relative_path = null)
 	{
 		$this->symfony_request = $symfony_request;
 		$this->filesystem = $filesystem;
+		$this->request = $request;
 		$this->phpbb_root_path = $phpbb_root_path;
 		$this->php_ext = $php_ext;
 		$this->adm_relative_path = $adm_relative_path;
@@ -98,7 +104,13 @@ class path_helper
 		{
 			$path = substr($path, strlen($this->phpbb_root_path));
 
-			return $this->get_web_root_path() . $path;
+			$web_root_path = $this->get_web_root_path();
+			if (substr($web_root_path, -8) === 'app.php/' && substr($path, 0, 7) === 'app.php')
+			{
+				$path = substr($path, 8);
+			}
+
+			return $this->filesystem->clean_path($web_root_path . $path);
 		}
 
 		return $path;
@@ -158,7 +170,7 @@ class path_helper
 		*/
 		if ($path_info === '/' && preg_match('/app\.' . $this->php_ext . '\/$/', $request_uri))
 		{
-			return $this->web_root_path = $this->phpbb_root_path . '../';
+			return $this->web_root_path = $this->filesystem->clean_path('./../' . $this->phpbb_root_path);
 		}
 
 		/*
@@ -170,31 +182,111 @@ class path_helper
 			return $this->web_root_path = $this->phpbb_root_path;
 		}
 
+		/*
+		* Check AJAX request:
+		* If the current request is a AJAX we need to fix the paths.
+		* We need to get the root path based on the Referer, so we can use
+		* the generated URLs in the template of the Referer. If we do not
+		* generate the relative path based on the Referer, but based on the
+		* currently requested URL, the generated URLs will not point to the
+		* intended locations:
+		*	Referer				desired URL			desired relative root path
+		*	memberlist.php		faq.php				./
+		*	memberlist.php		app.php/foo/bar		./
+		*	app.php/foo			memberlist.php		../
+		*	app.php/foo			app.php/fox			../
+		*	app.php/foo/bar		memberlist.php		../../
+		*	../page.php			memberlist.php		./phpBB/
+		*	../sub/page.php		memberlist.php		./../phpBB/
+		*
+		* The referer must be specified as a parameter in the query.
+		*/
+		if ($this->request->is_ajax() && $this->symfony_request->get('_referer'))
+		{
+			$referer_web_root_path = $this->get_web_root_path_from_ajax_referer(
+				$this->symfony_request->get('_referer'),
+				$this->symfony_request->getSchemeAndHttpHost() . $this->symfony_request->getBasePath()
+			);
+			return $this->web_root_path = $this->phpbb_root_path . $referer_web_root_path;
+		}
+
 		// How many corrections might we need?
 		$corrections = substr_count($path_info, '/');
 
 		/*
-		* If the script name (e.g. phpBB/app.php) exists in the
-		*	requestUri (e.g. phpBB/app.php/foo/template), then we
-		*	are have a non-rewritten URL.
+		* If the script name (e.g. phpBB/app.php) does not exists in the
+		* requestUri (e.g. phpBB/app.php/foo/template), then we are rewriting
+		* the URL. So we must reduce the slash count by 1.
 		*/
-		if (strpos($request_uri, $script_name) === 0)
+		if (strpos($request_uri, $script_name) !== 0)
 		{
-			/*
-			* Append ../ to the end of the phpbb_root_path as many times
-			*	as / exists in path_info
-			*/
-			return $this->web_root_path = $this->phpbb_root_path . str_repeat('../', $corrections);
+			$corrections--;
 		}
 
-		/*
-		* If we're here it means we're at a re-written path, so we must
-		*	correct the relative path for web URLs. We must append ../
-		*	to the end of the root path as many times as / exists in path_info
-		*	less one time (because the script, e.g. /app.php, doesn't exist in
-		*	the URL)
-		*/
-		return $this->web_root_path = $this->phpbb_root_path . str_repeat('../', $corrections - 1);
+		// Prepend ../ to the phpbb_root_path as many times as / exists in path_info
+		$this->web_root_path = $this->filesystem->clean_path(
+			'./' . str_repeat('../', $corrections) . $this->phpbb_root_path
+		);
+		return $this->web_root_path;
+	}
+
+	/**
+	* Get the web root path of the referer form an ajax request
+	*
+	* @param string $absolute_referer_url
+	* @param string $absolute_board_url
+	* @return string
+	*/
+	public function get_web_root_path_from_ajax_referer($absolute_referer_url, $absolute_board_url)
+	{
+		// If the board URL is in the beginning of the referer, this means
+		// we the referer is in the board URL or a subdirectory of it.
+		// So we just need to count the / (slashes) in the left over part of
+		// the referer and prepend ../ the the current root_path, to get the
+		// web root path of the referer.
+		if (strpos($absolute_referer_url, $absolute_board_url) === 0)
+		{
+			$relative_referer_path = substr($absolute_referer_url, strlen($absolute_board_url));
+			$has_params = strpos($relative_referer_path, '?');
+			if ($has_params !== false)
+			{
+				$relative_referer_path = substr($relative_referer_path, 0, $has_params);
+			}
+			$corrections = substr_count($relative_referer_path, '/');
+			return $this->phpbb_root_path . str_repeat('../', $corrections - 1);
+		}
+
+		// If not, it's a bit more complicated. We go to the parent directory
+		// of the referer until we find the remaining referer in the board URL.
+		// Foreach directory we need to add a ../ to the fixed root_path.
+		// When we finally found it, we need to remove the remaining referer
+		// from the board URL, to get the boards root path.
+		// If the then append these two strings, we get our fixed web root path.
+		$fixed_root_path = '';
+		$referer_dir = $absolute_referer_url;
+		$has_params = strpos($referer_dir, '?');
+		if ($has_params !== false)
+		{
+			$referer_dir = substr($referer_dir, 0, $has_params);
+		}
+
+		// If we do not find a slash at the end of the referer, we come
+		// from a file. So the first dirname() does not need a traversal
+		// path correction.
+		if (substr($referer_dir, -1) !== '/')
+		{
+			$referer_dir = dirname($referer_dir);
+		}
+
+		while (strpos($absolute_board_url, $referer_dir) !== 0)
+		{
+			$fixed_root_path .= '../';
+			$referer_dir = dirname($referer_dir);
+		}
+
+		$fixed_root_path .= substr($absolute_board_url, strlen($referer_dir) + 1);
+		// Add trailing slash
+		return $this->phpbb_root_path . $fixed_root_path . '/';
 	}
 
 	/**