1 files changed, 587 insertions, 0 deletions
diff --git a/phpBB/phpbb/cache/driver/file.php b/phpBB/phpbb/cache/driver/file.php
new file mode 100644
index 0000000000..fd5bce4515
--- /dev/null
+++ b/phpBB/phpbb/cache/driver/file.php
@@ -0,0 +1,587 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\cache\driver;
+
+/**
+* ACM File Based Caching
+*/
+class file extends \phpbb\cache\driver\base
+{
+	var $var_expires = array();
+
+	/**
+	* Set cache path
+	*
+	* @param string $cache_dir Define the path to the cache directory (default: $phpbb_root_path . 'cache/')
+	*/
+	function __construct($cache_dir = null)
+	{
+		global $phpbb_root_path;
+		$this->cache_dir = !is_null($cache_dir) ? $cache_dir : $phpbb_root_path . 'cache/';
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function load()
+	{
+		return $this->_read('data_global');
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function unload()
+	{
+		parent::unload();
+		unset($this->var_expires);
+		$this->var_expires = array();
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function save()
+	{
+		if (!$this->is_modified)
+		{
+			return;
+		}
+
+		global $phpEx;
+
+		if (!$this->_write('data_global'))
+		{
+			if (!function_exists('phpbb_is_writable'))
+			{
+				global $phpbb_root_path;
+				include($phpbb_root_path . 'includes/functions.' . $phpEx);
+			}
+
+			// Now, this occurred how often? ... phew, just tell the user then...
+			if (!phpbb_is_writable($this->cache_dir))
+			{
+				// We need to use die() here, because else we may encounter an infinite loop (the message handler calls $cache->unload())
+				die('Fatal: ' . $this->cache_dir . ' is NOT writable.');
+				exit;
+			}
+
+			die('Fatal: Not able to open ' . $this->cache_dir . 'data_global.' . $phpEx);
+			exit;
+		}
+
+		$this->is_modified = false;
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function tidy()
+	{
+		global $phpEx;
+
+		$dir = @opendir($this->cache_dir);
+
+		if (!$dir)
+		{
+			return;
+		}
+
+		$time = time();
+
+		while (($entry = readdir($dir)) !== false)
+		{
+			if (!preg_match('/^(sql_|data_(?!global))/', $entry))
+			{
+				continue;
+			}
+
+			if (!($handle = @fopen($this->cache_dir . $entry, 'rb')))
+			{
+				continue;
+			}
+
+			// Skip the PHP header
+			fgets($handle);
+
+			// Skip expiration
+			$expires = (int) fgets($handle);
+
+			fclose($handle);
+
+			if ($time >= $expires)
+			{
+				$this->remove_file($this->cache_dir . $entry);
+			}
+		}
+		closedir($dir);
+
+		if (file_exists($this->cache_dir . 'data_global.' . $phpEx))
+		{
+			if (!sizeof($this->vars))
+			{
+				$this->load();
+			}
+
+			foreach ($this->var_expires as $var_name => $expires)
+			{
+				if ($time >= $expires)
+				{
+					$this->destroy($var_name);
+				}
+			}
+		}
+
+		set_config('cache_last_gc', time(), true);
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function get($var_name)
+	{
+		if ($var_name[0] == '_')
+		{
+			if (!$this->_exists($var_name))
+			{
+				return false;
+			}
+
+			return $this->_read('data' . $var_name);
+		}
+		else
+		{
+			return ($this->_exists($var_name)) ? $this->vars[$var_name] : false;
+		}
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function put($var_name, $var, $ttl = 31536000)
+	{
+		if ($var_name[0] == '_')
+		{
+			$this->_write('data' . $var_name, $var, time() + $ttl);
+		}
+		else
+		{
+			$this->vars[$var_name] = $var;
+			$this->var_expires[$var_name] = time() + $ttl;
+			$this->is_modified = true;
+		}
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function purge()
+	{
+		parent::purge();
+		$this->var_expires = array();
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function destroy($var_name, $table = '')
+	{
+		global $phpEx;
+
+		if ($var_name == 'sql' && !empty($table))
+		{
+			if (!is_array($table))
+			{
+				$table = array($table);
+			}
+
+			$dir = @opendir($this->cache_dir);
+
+			if (!$dir)
+			{
+				return;
+			}
+
+			while (($entry = readdir($dir)) !== false)
+			{
+				if (strpos($entry, 'sql_') !== 0)
+				{
+					continue;
+				}
+
+				if (!($handle = @fopen($this->cache_dir . $entry, 'rb')))
+				{
+					continue;
+				}
+
+				// Skip the PHP header
+				fgets($handle);
+
+				// Skip expiration
+				fgets($handle);
+
+				// Grab the query, remove the LF
+				$query = substr(fgets($handle), 0, -1);
+
+				fclose($handle);
+
+				foreach ($table as $check_table)
+				{
+					// Better catch partial table names than no table names. ;)
+					if (strpos($query, $check_table) !== false)
+					{
+						$this->remove_file($this->cache_dir . $entry);
+						break;
+					}
+				}
+			}
+			closedir($dir);
+
+			return;
+		}
+
+		if (!$this->_exists($var_name))
+		{
+			return;
+		}
+
+		if ($var_name[0] == '_')
+		{
+			$this->remove_file($this->cache_dir . 'data' . $var_name . ".$phpEx", true);
+		}
+		else if (isset($this->vars[$var_name]))
+		{
+			$this->is_modified = true;
+			unset($this->vars[$var_name]);
+			unset($this->var_expires[$var_name]);
+
+			// We save here to let the following cache hits succeed
+			$this->save();
+		}
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function _exists($var_name)
+	{
+		if ($var_name[0] == '_')
+		{
+			global $phpEx;
+			return file_exists($this->cache_dir . 'data' . $var_name . ".$phpEx");
+		}
+		else
+		{
+			if (!sizeof($this->vars))
+			{
+				$this->load();
+			}
+
+			if (!isset($this->var_expires[$var_name]))
+			{
+				return false;
+			}
+
+			return (time() > $this->var_expires[$var_name]) ? false : isset($this->vars[$var_name]);
+		}
+	}
+
+	/**
+	* {@inheritDoc}
+	*/
+	function sql_save(\phpbb\db\driver\driver_interface $db, $query, $query_result, $ttl)
+	{
+		// Remove extra spaces and tabs
+		$query = preg_replace('/[\n\r\s\t]+/', ' ', $query);
+
+		$query_id = sizeof($this->sql_rowset);
+		$this->sql_rowset[$query_id] = array();
+		$this->sql_row_pointer[$query_id] = 0;
+
+		while ($row = $db->sql_fetchrow($query_result))
+		{
+			$this->sql_rowset[$query_id][] = $row;
+		}
+		$db->sql_freeresult($query_result);
+
+		if ($this->_write('sql_' . md5($query), $this->sql_rowset[$query_id], $ttl + time(), $query))
+		{
+			return $query_id;
+		}
+
+		return $query_result;
+	}
+
+	/**
+	* Read cached data from a specified file
+	*
+	* @access private
+	* @param string $filename Filename to write
+	* @return mixed False if an error was encountered, otherwise the data type of the cached data
+	*/
+	function _read($filename)
+	{
+		global $phpEx;
+
+		$file = "{$this->cache_dir}$filename.$phpEx";
+
+		$type = substr($filename, 0, strpos($filename, '_'));
+
+		if (!file_exists($file))
+		{
+			return false;
+		}
+
+		if (!($handle = @fopen($file, 'rb')))
+		{
+			return false;
+		}
+
+		// Skip the PHP header
+		fgets($handle);
+
+		if ($filename == 'data_global')
+		{
+			$this->vars = $this->var_expires = array();
+
+			$time = time();
+
+			while (($expires = (int) fgets($handle)) && !feof($handle))
+			{
+				// Number of bytes of data
+				$bytes = substr(fgets($handle), 0, -1);
+
+				if (!is_numeric($bytes) || ($bytes = (int) $bytes) === 0)
+				{
+					// We cannot process the file without a valid number of bytes
+					// so we discard it
+					fclose($handle);
+
+					$this->vars = $this->var_expires = array();
+					$this->is_modified = false;
+
+					$this->remove_file($file);
+
+					return false;
+				}
+
+				if ($time >= $expires)
+				{
+					fseek($handle, $bytes, SEEK_CUR);
+
+					continue;
+				}
+
+				$var_name = substr(fgets($handle), 0, -1);
+
+				// Read the length of bytes that consists of data.
+				$data = fread($handle, $bytes - strlen($var_name));
+				$data = @unserialize($data);
+
+				// Don't use the data if it was invalid
+				if ($data !== false)
+				{
+					$this->vars[$var_name] = $data;
+					$this->var_expires[$var_name] = $expires;
+				}
+
+				// Absorb the LF
+				fgets($handle);
+			}
+
+			fclose($handle);
+
+			$this->is_modified = false;
+
+			return true;
+		}
+		else
+		{
+			$data = false;
+			$line = 0;
+
+			while (($buffer = fgets($handle)) && !feof($handle))
+			{
+				$buffer = substr($buffer, 0, -1); // Remove the LF
+
+				// $buffer is only used to read integers
+				// if it is non numeric we have an invalid
+				// cache file, which we will now remove.
+				if (!is_numeric($buffer))
+				{
+					break;
+				}
+
+				if ($line == 0)
+				{
+					$expires = (int) $buffer;
+
+					if (time() >= $expires)
+					{
+						break;
+					}
+
+					if ($type == 'sql')
+					{
+						// Skip the query
+						fgets($handle);
+					}
+				}
+				else if ($line == 1)
+				{
+					$bytes = (int) $buffer;
+
+					// Never should have 0 bytes
+					if (!$bytes)
+					{
+						break;
+					}
+
+					// Grab the serialized data
+					$data = fread($handle, $bytes);
+
+					// Read 1 byte, to trigger EOF
+					fread($handle, 1);
+
+					if (!feof($handle))
+					{
+						// Somebody tampered with our data
+						$data = false;
+					}
+					break;
+				}
+				else
+				{
+					// Something went wrong
+					break;
+				}
+				$line++;
+			}
+			fclose($handle);
+
+			// unserialize if we got some data
+			$data = ($data !== false) ? @unserialize($data) : $data;
+
+			if ($data === false)
+			{
+				$this->remove_file($file);
+				return false;
+			}
+
+			return $data;
+		}
+	}
+
+	/**
+	* Write cache data to a specified file
+	*
+	* 'data_global' is a special case and the generated format is different for this file:
+	* <code>
+	* <?php exit; ?>
+	* (expiration)
+	* (length of var and serialised data)
+	* (var)
+	* (serialised data)
+	* ... (repeat)
+	* </code>
+	*
+	* The other files have a similar format:
+	* <code>
+	* <?php exit; ?>
+	* (expiration)
+	* (query) [SQL files only]
+	* (length of serialised data)
+	* (serialised data)
+	* </code>
+	*
+	* @access private
+	* @param string $filename Filename to write
+	* @param mixed $data Data to store
+	* @param int $expires Timestamp when the data expires
+	* @param string $query Query when caching SQL queries
+	* @return bool True if the file was successfully created, otherwise false
+	*/
+	function _write($filename, $data = null, $expires = 0, $query = '')
+	{
+		global $phpEx;
+
+		$file = "{$this->cache_dir}$filename.$phpEx";
+
+		$lock = new \phpbb\lock\flock($file);
+		$lock->acquire();
+
+		if ($handle = @fopen($file, 'wb'))
+		{
+			// File header
+			fwrite($handle, '<' . '?php exit; ?' . '>');
+
+			if ($filename == 'data_global')
+			{
+				// Global data is a different format
+				foreach ($this->vars as $var => $data)
+				{
+					if (strpos($var, "\r") !== false || strpos($var, "\n") !== false)
+					{
+						// CR/LF would cause fgets() to read the cache file incorrectly
+						// do not cache test entries, they probably won't be read back
+						// the cache keys should really be alphanumeric with a few symbols.
+						continue;
+					}
+					$data = serialize($data);
+
+					// Write out the expiration time
+					fwrite($handle, "\n" . $this->var_expires[$var] . "\n");
+
+					// Length of the remaining data for this var (ignoring two LF's)
+					fwrite($handle, strlen($data . $var) . "\n");
+					fwrite($handle, $var . "\n");
+					fwrite($handle, $data);
+				}
+			}
+			else
+			{
+				fwrite($handle, "\n" . $expires . "\n");
+
+				if (strpos($filename, 'sql_') === 0)
+				{
+					fwrite($handle, $query . "\n");
+				}
+				$data = serialize($data);
+
+				fwrite($handle, strlen($data) . "\n");
+				fwrite($handle, $data);
+			}
+
+			fclose($handle);
+
+			if (!function_exists('phpbb_chmod'))
+			{
+				global $phpbb_root_path;
+				include($phpbb_root_path . 'includes/functions.' . $phpEx);
+			}
+
+			phpbb_chmod($file, CHMOD_READ | CHMOD_WRITE);
+
+			$return_value = true;
+		}
+		else
+		{
+			$return_value = false;
+		}
+
+		$lock->release();
+
+		return $return_value;
+	}
+}