new file mode 100644
--- /dev/null
+++ b/library/smarty/libs/sysplugins/smarty_cacheresource_custom.php
@@ -0,0 +1,300 @@
+<?php
+/**
+ * Smarty Internal Plugin
+ *
+ * @package Smarty
+ * @subpackage Cacher
+ */
+
+/**
+ * Cache Handler API
+ *
+ * @package Smarty
+ * @subpackage Cacher
+ * @author Rodney Rehm
+ */
+abstract class Smarty_CacheResource_Custom extends Smarty_CacheResource {
+ /**
+ * fetch cached content and its modification time from data source
+ *
+ * @param string $id unique cache content identifier
+ * @param string $name template name
+ * @param string $cache_id cache id
+ * @param string $compile_id compile id
+ * @param string $content cached content
+ * @param integer $mtime cache modification timestamp (epoch)
+ *
+ * @return void
+ */
+ abstract protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime);
+
+ /**
+ * Fetch cached content's modification timestamp from data source
+ * {@internal implementing this method is optional.
+ * Only implement it if modification times can be accessed faster than loading the complete cached content.}}
+ *
+ * @param string $id unique cache content identifier
+ * @param string $name template name
+ * @param string $cache_id cache id
+ * @param string $compile_id compile id
+ *
+ * @return integer|boolean timestamp (epoch) the template was modified, or false if not found
+ */
+ protected function fetchTimestamp($id, $name, $cache_id, $compile_id) {
+ return null;
+ }
+
+ /**
+ * Save content to cache
+ *
+ * @param string $id unique cache content identifier
+ * @param string $name template name
+ * @param string $cache_id cache id
+ * @param string $compile_id compile id
+ * @param integer|null $exp_time seconds till expiration or null
+ * @param string $content content to cache
+ *
+ * @return boolean success
+ */
+ abstract protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content);
+
+ /**
+ * Delete content from cache
+ *
+ * @param string $name template name
+ * @param string $cache_id cache id
+ * @param string $compile_id compile id
+ * @param integer|null $exp_time seconds till expiration time in seconds or null
+ *
+ * @return integer number of deleted caches
+ */
+ abstract protected function delete($name, $cache_id, $compile_id, $exp_time);
+
+ /**
+ * populate Cached Object with meta data from Resource
+ *
+ * @param Smarty_Template_Cached $cached cached object
+ * @param Smarty_Internal_Template $_template template object
+ *
+ * @return void
+ */
+ public function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template) {
+ $_cache_id = isset($cached->cache_id) ? preg_replace('![^\w\|]+!', '_', $cached->cache_id) : null;
+ $_compile_id = isset($cached->compile_id) ? preg_replace('![^\w\|]+!', '_', $cached->compile_id) : null;
+ $path = $cached->source->filepath . $_cache_id . $_compile_id;
+ $cached->filepath = sha1($path);
+ if ($_template->smarty->cache_locking) {
+ $cached->lock_id = sha1('lock.' . $path);
+ }
+ $this->populateTimestamp($cached);
+ }
+
+ /**
+ * populate Cached Object with timestamp and exists from Resource
+ *
+ * @param Smarty_Template_Cached $cached
+ *
+ * @return void
+ */
+ public function populateTimestamp(Smarty_Template_Cached $cached) {
+ $mtime = $this->fetchTimestamp($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id);
+ if ($mtime !== null) {
+ $cached->timestamp = $mtime;
+ $cached->exists = !!$cached->timestamp;
+
+ return;
+ }
+ $timestamp = null;
+ $this->fetch($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id, $cached->content, $timestamp);
+ $cached->timestamp = isset($timestamp) ? $timestamp : false;
+ $cached->exists = !!$cached->timestamp;
+ }
+
+ /**
+ * Read the cached template and process the header
+ *
+ * @param Smarty_Internal_Template $_template template object
+ * @param Smarty_Template_Cached $cached cached object
+ *
+ * @return boolean true or false if the cached content does not exist
+ */
+ public function process(Smarty_Internal_Template $_template, Smarty_Template_Cached $cached = null) {
+ if (!$cached) {
+ $cached = $_template->cached;
+ }
+ $content = $cached->content ? $cached->content : null;
+ $timestamp = $cached->timestamp ? $cached->timestamp : null;
+ if ($content === null || !$timestamp) {
+ $this->fetch(
+ $_template->cached->filepath,
+ $_template->source->name,
+ $_template->cache_id,
+ $_template->compile_id,
+ $content,
+ $timestamp
+ );
+ }
+ if (isset($content)) {
+ /** @var Smarty_Internal_Template $_smarty_tpl
+ * used in evaluated code
+ */
+ $_smarty_tpl = $_template;
+ eval("?>" . $content);
+
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Write the rendered template output to cache
+ *
+ * @param Smarty_Internal_Template $_template template object
+ * @param string $content content to cache
+ *
+ * @return boolean success
+ */
+ public function writeCachedContent(Smarty_Internal_Template $_template, $content) {
+ return $this->save(
+ $_template->cached->filepath,
+ $_template->source->name,
+ $_template->cache_id,
+ $_template->compile_id,
+ $_template->properties['cache_lifetime'],
+ $content
+ );
+ }
+
+ /**
+ * Read cached template from cache
+ *
+ * @param Smarty_Internal_Template $_template template object
+ *
+ * @return string content
+ */
+ public function readCachedContent(Smarty_Internal_Template $_template) {
+ $content = $_template->cached->content ? $_template->cached->content : null;
+ $timestamp = null;
+ if ($content === null) {
+ $timestamp = null;
+ $this->fetch(
+ $_template->cached->filepath,
+ $_template->source->name,
+ $_template->cache_id,
+ $_template->compile_id,
+ $content,
+ $timestamp
+ );
+ }
+ if (isset($content)) {
+ return $content;
+ }
+ return false;
+ }
+
+ /**
+ * Empty cache
+ *
+ * @param Smarty $smarty Smarty object
+ * @param integer $exp_time expiration time (number of seconds, not timestamp)
+ *
+ * @return integer number of cache files deleted
+ */
+ public function clearAll(Smarty $smarty, $exp_time = null) {
+ $this->cache = array();
+
+ return $this->delete(null, null, null, $exp_time);
+ }
+
+ /**
+ * Empty cache for a specific template
+ *
+ * @param Smarty $smarty Smarty object
+ * @param string $resource_name template name
+ * @param string $cache_id cache id
+ * @param string $compile_id compile id
+ * @param integer $exp_time expiration time (number of seconds, not timestamp)
+ *
+ * @return integer number of cache files deleted
+ */
+ public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time) {
+ $this->cache = array();
+ $cache_name = null;
+
+ if (isset($resource_name)) {
+ $_save_stat = $smarty->caching;
+ $smarty->caching = true;
+ $tpl = new $smarty->template_class($resource_name, $smarty);
+ $smarty->caching = $_save_stat;
+
+ if ($tpl->source->exists) {
+ $cache_name = $tpl->source->name;
+ } else {
+ return 0;
+ }
+ // remove from template cache
+ if ($smarty->allow_ambiguous_resources) {
+ $_templateId = $tpl->source->unique_resource . $tpl->cache_id . $tpl->compile_id;
+ } else {
+ $_templateId = $smarty->joined_template_dir . '#' . $resource_name . $tpl->cache_id . $tpl->compile_id;
+ }
+ if (isset($_templateId[150])) {
+ $_templateId = sha1($_templateId);
+ }
+ unset($smarty->template_objects[$_templateId]);
+ // template object no longer needed
+ unset($tpl);
+ }
+
+ return $this->delete($cache_name, $cache_id, $compile_id, $exp_time);
+ }
+
+ /**
+ * Check is cache is locked for this template
+ *
+ * @param Smarty $smarty Smarty object
+ * @param Smarty_Template_Cached $cached cached object
+ *
+ * @return boolean true or false if cache is locked
+ */
+ public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached) {
+ $id = $cached->lock_id;
+ $name = $cached->source->name . '.lock';
+
+ $mtime = $this->fetchTimestamp($id, $name, $cached->cache_id, $cached->compile_id);
+ if ($mtime === null) {
+ $this->fetch($id, $name, $cached->cache_id, $cached->compile_id, $content, $mtime);
+ }
+ return $mtime && ($t = time()) - $mtime < $smarty->locking_timeout;
+ }
+
+ /**
+ * Lock cache for this template
+ *
+ * @param Smarty $smarty Smarty object
+ * @param Smarty_Template_Cached $cached cached object
+ *
+ * @return bool|void
+ */
+ public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached) {
+ $cached->is_locked = true;
+ $id = $cached->lock_id;
+ $name = $cached->source->name . '.lock';
+ $this->save($id, $name, $cached->cache_id, $cached->compile_id, $smarty->locking_timeout, '');
+ }
+
+ /**
+ * Unlock cache for this template
+ *
+ * @param Smarty $smarty Smarty object
+ * @param Smarty_Template_Cached $cached cached object
+ *
+ * @return bool|void
+ */
+ public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached) {
+ $cached->is_locked = false;
+ $name = $cached->source->name . '.lock';
+ $this->delete($name, $cached->cache_id, $cached->compile_id, null);
+ }
+}