<?php

/**

 * Created by PhpStorm.

 * User: Uwe Tews

 * Date: 04.12.2014

 * Time: 06:08

 */

/**

 * Smarty Resource Data Object

 * Cache Data Container for Template Files

 *

 * @package    Smarty

 * @subpackage TemplateResources

 * @author     Rodney Rehm

 */

class Smarty_Template_Cached {

    /**

     * Source Filepath

     *

     * @var string

     */

    public $filepath = false;

    /**

     * Source Content

     *

     * @var string

     */

    public $content = null;

    /**

     * Source Timestamp

     *

     * @var integer

     */

    public $timestamp = false;

    /**

     * Source Existence

     *

     * @var boolean

     */

    public $exists = false;

    /**

     * Cache Is Valid

     *

     * @var boolean

     */

    public $valid = null;

    /**

     * Cache was processed

     *

     * @var boolean

     */

    public $processed = false;

    /**

     * CacheResource Handler

     *

     * @var Smarty_CacheResource

     */

    public $handler = null;

    /**

     * Template Compile Id (Smarty_Internal_Template::$compile_id)

     *

     * @var string

     */

    public $compile_id = null;

    /**

     * Template Cache Id (Smarty_Internal_Template::$cache_id)

     *

     * @var string

     */

    public $cache_id = null;

    /**

     * Id for cache locking

     *

     * @var string

     */

    public $lock_id = null;

    /**

     * flag that cache is locked by this instance

     *

     * @var bool

     */

    public $is_locked = false;

    /**

     * Source Object

     *

     * @var Smarty_Template_Source

     */

    public $source = null;

    /**

     * create Cached Object container

     *

     * @param Smarty_Internal_Template $_template template object

     */

    public function __construct(Smarty_Internal_Template $_template) {

        $this->compile_id = $_template->compile_id;

        $this->cache_id = $_template->cache_id;

        if (!isset($_template->source)) {

            $_template->loadSource();

        }

        $this->source = $_template->source;

        if (!class_exists('Smarty_CacheResource', false)) {

            require SMARTY_SYSPLUGINS_DIR . 'smarty_cacheresource.php';

        }

        $this->handler = Smarty_CacheResource::load($_template->smarty);

    }

    /**

     * @param Smarty_Internal_Template $_template

     *

     * @return Smarty_Template_Cached

     */

    static function load(Smarty_Internal_Template $_template) {

        $_template->cached = $cached = new Smarty_Template_Cached($_template);

        $cached->handler->populate($cached, $_template);

        // caching enabled ?

        if (!($_template->caching == Smarty::CACHING_LIFETIME_CURRENT || $_template->caching == Smarty::CACHING_LIFETIME_SAVED) || $_template->source->recompiled) {

            $cached->valid = false;

        }

        return $cached;

    }

    /**

     * Check if cache is valid, lock cache if required

     *

     * @param \Smarty_Internal_Template $_template

     *

     * @return bool flag true if cache is valid

     */

    public function isCached(Smarty_Internal_Template $_template) {

        if ($this->valid !== null) {

            return $this->valid;

        }

        while (true) {

            while (true) {

                if ($this->exists === false || $_template->smarty->force_compile || $_template->smarty->force_cache) {

                    $this->valid = false;

                } else {

                    $this->valid = true;

                }

                if ($this->valid && $_template->caching == Smarty::CACHING_LIFETIME_CURRENT && $_template->cache_lifetime >= 0 && time() > ($this->timestamp + $_template->cache_lifetime)) {

                    // lifetime expired

                    $this->valid = false;

                }

                if ($this->valid && $_template->source->timestamp > $this->timestamp) {

                    $this->valid = false;

                }

                if ($this->valid || !$_template->smarty->cache_locking) {

                    break;

                }

                if (!$this->handler->locked($_template->smarty, $this)) {

                    $this->handler->acquireLock($_template->smarty, $this);

                    break 2;

                }

                $this->handler->populate($this, $_template);

            }

            if ($this->valid) {

                if (!$_template->smarty->cache_locking || $this->handler->locked($_template->smarty, $this) === null) {

                    // load cache file for the following checks

                    if ($_template->smarty->debugging) {

                        Smarty_Internal_Debug::start_cache($_template);

                    }

                    if ($this->handler->process($_template, $this) === false) {

                        $this->valid = false;

                    } else {

                        $this->processed = true;

                    }

                    if ($_template->smarty->debugging) {

                        Smarty_Internal_Debug::end_cache($_template);

                    }

                } else {

                    $this->is_locked = true;

                    continue;

                }

            } else {

                return $this->valid;

            }

            if ($this->valid && $_template->caching === Smarty::CACHING_LIFETIME_SAVED && $_template->properties['cache_lifetime'] >= 0 && (time() > ($_template->cached->timestamp + $_template->properties['cache_lifetime']))) {

                $this->valid = false;

            }

            if ($_template->smarty->cache_locking) {

                if (!$this->valid) {

                    $this->handler->acquireLock($_template->smarty, $this);

                } elseif ($this->is_locked) {

                    $this->handler->releaseLock($_template->smarty, $this);

                }

            }

            return $this->valid;

        }

        return $this->valid;

    }

    /**

     * Process cached template

     *

     * @param Smarty_Internal_Template $_template template object

     */

    public function process(Smarty_Internal_Template $_template) {

        if ($this->handler->process($_template, $this) === false) {

            $this->valid = false;

        }

        if ($this->valid) {

            $this->processed = true;

        } else {

            $this->processed = false;

        }

    }

    /**

     * Render cached template

     *

     * @param Smarty_Internal_Template $_template

     *

     * @return string

     * @throws Exception

     */

    public function render(Smarty_Internal_Template $_template) {

        if (!$this->processed) {

            $this->process($_template);

        }

        return $_template->getRenderedTemplateCode();

    }

    /**

     * Write this cache object to handler

     *

     * @param Smarty_Internal_Template $_template template object

     * @param string $content content to cache

     *

     * @return boolean success

     */

    public function write(Smarty_Internal_Template $_template, $content) {

        if (!$_template->source->recompiled) {

            if ($this->handler->writeCachedContent($_template, $content)) {

                $this->content = null;

                $this->timestamp = time();

                $this->exists = true;

                $this->valid = true;

                $this->processed = false;

                if ($_template->smarty->cache_locking) {

                    $this->handler->releaseLock($_template->smarty, $this);

                }

                return true;

            }

            $this->content = null;

            $this->timestamp = false;

            $this->exists = false;

            $this->valid = false;

            $this->processed = false;

        }

        return false;

    }

    /**

     * Read cache content from handler

     *

     * @param Smarty_Internal_Template $_template template object

     *

     * @return string content

     */

    public function read(Smarty_Internal_Template $_template) {

        if (!$_template->source->recompiled) {

            return $this->handler->readCachedContent($_template);

        }

        return false;

    }

    /**

     * Sanitize content and write it to cache resource

     *

     * @param Smarty_Internal_Template $_template

     * @param string $content

     * @param bool $no_output_filter

     *

     * @throws SmartyException

     */

    public function updateCache(Smarty_Internal_Template $_template, $content, $no_output_filter) {

        $_template->properties['has_nocache_code'] = false;

        // get text between non-cached items

        $cache_split = preg_split("!/\*%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*\/(.+?)/\*/%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!s", $content);

        // get non-cached items

        preg_match_all("!/\*%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*\/(.+?)/\*/%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!s", $content, $cache_parts);

        $output = '';

        // loop over items, stitch back together

        foreach ($cache_split as $curr_idx => $curr_split) {

            // escape PHP tags in template content

            $output .= preg_replace('/(<%|%>|<\?php|<\?|\?>|<script\s+language\s*=\s*[\"\']?\s*php\s*[\"\']?\s*>)/', "<?php echo '\$1'; ?>\n", $curr_split);

            if (isset($cache_parts[0][$curr_idx])) {

                $_template->properties['has_nocache_code'] = true;

                $output .= $cache_parts[1][$curr_idx];

            }

        }

        if (!$no_output_filter && !$_template->has_nocache_code && (isset($_template->smarty->autoload_filters['output']) || isset($_template->smarty->registered_filters['output']))) {

            $output = Smarty_Internal_Filter_Handler::runFilter('output', $output, $_template);

        }

        // write cache file content

        $this->writeCachedContent($_template, $output);

    }

    /**

     * Writes the content to cache resource

     *

     * @param Smarty_Internal_Template $_template

     * @param string $content

     *

     * @return bool

     */

    public function writeCachedContent(Smarty_Internal_Template $_template, $content) {

        if ($_template->source->recompiled || !($_template->caching == Smarty::CACHING_LIFETIME_CURRENT || $_template->caching == Smarty::CACHING_LIFETIME_SAVED)) {

            // don't write cache file

            return false;

        }

        $_template->properties['cache_lifetime'] = $_template->cache_lifetime;

        $_template->properties['unifunc'] = 'content_' . str_replace(array('.', ','), '_', uniqid('', true));

        $content = Smarty_Internal_Extension_CodeFrame::create($_template, $content, true);

        if (!empty($_template->properties['tpl_function'])) {

            foreach ($_template->properties['tpl_function'] as $funcParam) {

                if (is_file($funcParam['compiled_filepath'])) {

                    // read compiled file

                    $code = file_get_contents($funcParam['compiled_filepath']);

                    // grab template function

                    if (preg_match("/\/\* {$funcParam['call_name']} \*\/([\S\s]*?)\/\*\/ {$funcParam['call_name']} \*\//", $code, $match)) {

                        unset($code);

                        $content .= "<?php " . $match[0] . "?>\n";

                    }

                }

            }

        }

        return $this->write($_template, $content);

    }

    /**

     * check client side cache

     *

     * @param Smarty_Internal_Template $_template

     * @param  string $content

     */

    public function cacheModifiedCheck(Smarty_Internal_Template $_template, $content) {

        $_isCached = $_template->isCached() && !$_template->has_nocache_code;

        $_last_modified_date = @substr($_SERVER['HTTP_IF_MODIFIED_SINCE'], 0, strpos($_SERVER['HTTP_IF_MODIFIED_SINCE'], 'GMT') + 3);

        if ($_isCached && $this->timestamp <= strtotime($_last_modified_date)) {

            switch (PHP_SAPI) {

                case 'cgi': // php-cgi < 5.3

                case 'cgi-fcgi': // php-cgi >= 5.3

                case 'fpm-fcgi': // php-fpm >= 5.3.3

                    header('Status: 304 Not Modified');

                    break;

                case 'cli':

                    if ( /* ^phpunit */

                    !empty($_SERVER['SMARTY_PHPUNIT_DISABLE_HEADERS']) /* phpunit$ */

                    ) {

                        $_SERVER['SMARTY_PHPUNIT_HEADERS'][] = '304 Not Modified';

                    }

                    break;

                default:

                    header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');

                    break;

            }

        } else {

            switch (PHP_SAPI) {

                case 'cli':

                    if ( /* ^phpunit */

                    !empty($_SERVER['SMARTY_PHPUNIT_DISABLE_HEADERS']) /* phpunit$ */

                    ) {

                        $_SERVER['SMARTY_PHPUNIT_HEADERS'][] = 'Last-Modified: ' . gmdate('D, d M Y H:i:s', $this->timestamp) . ' GMT';

                    }

                    break;

                default:

                    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $this->timestamp) . ' GMT');

                    break;

            }

            echo $content;

        }

    }

}