336 lines
9.5 KiB
PHP
336 lines
9.5 KiB
PHP
<?php
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/**
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* CacheHelper helps create full page view caching.
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.View.Helper
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* @since CakePHP(tm) v 1.0.0.2277
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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App::uses('AppHelper', 'View/Helper');
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/**
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* CacheHelper helps create full page view caching.
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*
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* When using CacheHelper you don't call any of its methods, they are all automatically
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* called by View, and use the $cacheAction settings set in the controller.
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*
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* @package Cake.View.Helper
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* @link http://book.cakephp.org/2.0/en/core-libraries/helpers/cache.html
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*/
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class CacheHelper extends AppHelper {
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/**
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* Array of strings replaced in cached views.
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* The strings are found between `<!--nocache--><!--/nocache-->` in views
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*
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* @var array
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*/
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protected $_replace = array();
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/**
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* Array of string that are replace with there var replace above.
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* The strings are any content inside `<!--nocache--><!--/nocache-->` and includes the tags in views
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*
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* @var array
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*/
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protected $_match = array();
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/**
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* Counter used for counting nocache section tags.
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*
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* @var integer
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*/
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protected $_counter = 0;
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/**
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* Is CacheHelper enabled? should files + output be parsed.
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*
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* @return boolean
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*/
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protected function _enabled() {
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return $this->_View->cacheAction && (Configure::read('Cache.check') === true);
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}
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/**
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* Parses the view file and stores content for cache file building.
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*
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* @param string $viewFile
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* @param string $output The output for the file.
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* @return string Updated content.
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*/
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public function afterRenderFile($viewFile, $output) {
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if ($this->_enabled()) {
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return $this->_parseContent($viewFile, $output);
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}
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}
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/**
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* Parses the layout file and stores content for cache file building.
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*
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* @param string $layoutFile
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* @return void
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*/
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public function afterLayout($layoutFile) {
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if ($this->_enabled()) {
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$this->_View->output = $this->cache($layoutFile, $this->_View->output);
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}
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$this->_View->output = preg_replace('/<!--\/?nocache-->/', '', $this->_View->output);
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}
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/**
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* Parse a file + output. Matches nocache tags between the current output and the current file
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* stores a reference of the file, so the generated can be swapped back with the file contents when
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* writing the cache file.
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*
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* @param string $file The filename to process.
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* @param string $out The output for the file.
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* @return string Updated content.
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*/
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protected function _parseContent($file, $out) {
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$out = preg_replace_callback('/<!--nocache-->/', array($this, '_replaceSection'), $out);
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$this->_parseFile($file, $out);
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return $out;
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}
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/**
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* Main method used to cache a view
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*
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* @param string $file File to cache
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* @param string $out output to cache
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* @return string view output
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* @link http://book.cakephp.org/2.0/en/core-libraries/helpers/cache.html
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*/
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public function cache($file, $out) {
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$cacheTime = 0;
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$useCallbacks = false;
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$cacheAction = $this->_View->cacheAction;
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if (is_array($cacheAction)) {
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$keys = array_keys($cacheAction);
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$index = null;
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foreach ($keys as $action) {
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if ($action == $this->request->params['action']) {
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$index = $action;
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break;
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}
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}
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if (!isset($index) && $this->request->params['action'] === 'index') {
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$index = 'index';
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}
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$options = $cacheAction;
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if (isset($cacheAction[$index])) {
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if (is_array($cacheAction[$index])) {
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$options = array_merge(array('duration' => 0, 'callbacks' => false), $cacheAction[$index]);
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} else {
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$cacheTime = $cacheAction[$index];
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}
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}
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if (isset($options['duration'])) {
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$cacheTime = $options['duration'];
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}
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if (isset($options['callbacks'])) {
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$useCallbacks = $options['callbacks'];
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}
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} else {
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$cacheTime = $cacheAction;
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}
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if ($cacheTime && $cacheTime > 0) {
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$cached = $this->_parseOutput($out);
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try {
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$this->_writeFile($cached, $cacheTime, $useCallbacks);
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} catch (Exception $e) {
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$message = __d(
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'cake_dev',
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'Unable to write view cache file: "%s" for "%s"',
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$e->getMessage(),
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$this->request->here
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);
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$this->log($message, 'error');
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}
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$out = $this->_stripTags($out);
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}
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return $out;
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}
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/**
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* Parse file searching for no cache tags
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*
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* @param string $file The filename that needs to be parsed.
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* @param string $cache The cached content
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* @return void
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*/
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protected function _parseFile($file, $cache) {
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if (is_file($file)) {
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$file = file_get_contents($file);
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} elseif ($file = fileExistsInPath($file)) {
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$file = file_get_contents($file);
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}
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preg_match_all('/(<!--nocache:\d{3}-->(?<=<!--nocache:\d{3}-->)[\\s\\S]*?(?=<!--\/nocache-->)<!--\/nocache-->)/i', $cache, $outputResult, PREG_PATTERN_ORDER);
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preg_match_all('/(?<=<!--nocache-->)([\\s\\S]*?)(?=<!--\/nocache-->)/i', $file, $fileResult, PREG_PATTERN_ORDER);
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$fileResult = $fileResult[0];
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$outputResult = $outputResult[0];
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if (!empty($this->_replace)) {
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foreach ($outputResult as $i => $element) {
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$index = array_search($element, $this->_match);
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if ($index !== false) {
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unset($outputResult[$i]);
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}
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}
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$outputResult = array_values($outputResult);
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}
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if (!empty($fileResult)) {
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$i = 0;
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foreach ($fileResult as $cacheBlock) {
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if (isset($outputResult[$i])) {
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$this->_replace[] = $cacheBlock;
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$this->_match[] = $outputResult[$i];
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}
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$i++;
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}
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}
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}
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/**
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* Munges the output from a view with cache tags, and numbers the sections.
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* This helps solve issues with empty/duplicate content.
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*
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* @return string The content with cake:nocache tags replaced.
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*/
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protected function _replaceSection() {
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$this->_counter += 1;
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return sprintf('<!--nocache:%03d-->', $this->_counter);
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}
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/**
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* Strip cake:nocache tags from a string. Since View::render()
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* only removes un-numbered nocache tags, remove all the numbered ones.
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* This is the complement to _replaceSection.
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*
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* @param string $content String to remove tags from.
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* @return string String with tags removed.
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*/
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protected function _stripTags($content) {
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return preg_replace('#<!--/?nocache(\:\d{3})?-->#', '', $content);
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}
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/**
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* Parse the output and replace cache tags
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*
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* @param string $cache Output to replace content in.
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* @return string with all replacements made to <!--nocache--><!--nocache-->
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*/
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protected function _parseOutput($cache) {
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$count = 0;
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if (!empty($this->_match)) {
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foreach ($this->_match as $found) {
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$original = $cache;
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$length = strlen($found);
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$position = 0;
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for ($i = 1; $i <= 1; $i++) {
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$position = strpos($cache, $found, $position);
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if ($position !== false) {
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$cache = substr($original, 0, $position);
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$cache .= $this->_replace[$count];
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$cache .= substr($original, $position + $length);
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} else {
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break;
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}
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}
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$count++;
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}
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return $cache;
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}
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return $cache;
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}
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/**
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* Write a cached version of the file
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*
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* @param string $content view content to write to a cache file.
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* @param string $timestamp Duration to set for cache file.
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* @param boolean $useCallbacks
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* @return boolean success of caching view.
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*/
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protected function _writeFile($content, $timestamp, $useCallbacks = false) {
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$now = time();
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if (is_numeric($timestamp)) {
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$cacheTime = $now + $timestamp;
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} else {
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$cacheTime = strtotime($timestamp, $now);
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}
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$path = $this->request->here();
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if ($path === '/') {
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$path = 'home';
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}
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$prefix = Configure::read('Cache.viewPrefix');
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if ($prefix) {
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$path = $prefix . '_' . $path;
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}
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$cache = strtolower(Inflector::slug($path));
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if (empty($cache)) {
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return;
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}
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$cache = $cache . '.php';
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$file = '<!--cachetime:' . $cacheTime . '--><?php';
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if (empty($this->_View->plugin)) {
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$file .= "
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App::uses('{$this->_View->name}Controller', 'Controller');
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";
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} else {
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$file .= "
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App::uses('{$this->_View->plugin}AppController', '{$this->_View->plugin}.Controller');
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App::uses('{$this->_View->name}Controller', '{$this->_View->plugin}.Controller');
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";
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}
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$file .= '
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$request = unserialize(base64_decode(\'' . base64_encode(serialize($this->request)) . '\'));
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$response->type(\'' . $this->_View->response->type() . '\');
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$controller = new ' . $this->_View->name . 'Controller($request, $response);
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$controller->plugin = $this->plugin = \'' . $this->_View->plugin . '\';
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$controller->helpers = $this->helpers = unserialize(base64_decode(\'' . base64_encode(serialize($this->_View->helpers)) . '\'));
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$controller->layout = $this->layout = \'' . $this->_View->layout . '\';
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$controller->theme = $this->theme = \'' . $this->_View->theme . '\';
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$controller->viewVars = unserialize(base64_decode(\'' . base64_encode(serialize($this->_View->viewVars)) . '\'));
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Router::setRequestInfo($controller->request);
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$this->request = $request;';
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if ($useCallbacks) {
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$file .= '
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$controller->constructClasses();
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$controller->startupProcess();';
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}
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$file .= '
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$this->viewVars = $controller->viewVars;
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$this->loadHelpers();
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extract($this->viewVars, EXTR_SKIP);
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?>';
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$content = preg_replace("/(<\\?xml)/", "<?php echo '$1'; ?>", $content);
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$file .= $content;
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return cache('views' . DS . $cache, $file, $timestamp);
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}
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}
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