<?php
/**
 * Smarty Internal Plugin CacheResource File
 *
 * @package    Smarty
 * @subpackage Cacher
 * @author     Uwe Tews
 * @author     Rodney Rehm
 */

/**
 * This class does contain all necessary methods for the HTML cache on file system
 * Implements the file system as resource for the HTML cache Version ussing nocache inserts.
 *
 * @package    Smarty
 * @subpackage Cacher
 */
class Smarty_Internal_CacheResource_File extends Smarty_CacheResource
{
    /**
     * 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)
    {
        $source = &$_template->source;
        $smarty = &$_template->smarty;
        $_compile_dir_sep = $smarty->use_sub_dirs ? $smarty->ds : '^';
        $_filepath = sha1($source->uid . $smarty->_joined_template_dir);
        $cached->filepath = $smarty->getCacheDir();
        if (isset($_template->cache_id)) {
            $cached->filepath .= preg_replace(array('![^\w|]+!', '![|]+!'), array('_', $_compile_dir_sep),
                                              $_template->cache_id) . $_compile_dir_sep;
        }
        if (isset($_template->compile_id)) {
            $cached->filepath .= preg_replace('![^\w]+!', '_', $_template->compile_id) . $_compile_dir_sep;
        }
        // if use_sub_dirs, break file into directories
        if ($smarty->use_sub_dirs) {
            $cached->filepath .= $_filepath[ 0 ] . $_filepath[ 1 ] . $smarty->ds . $_filepath[ 2 ] . $_filepath[ 3 ] . $smarty->ds .
                                 $_filepath[ 4 ] . $_filepath[ 5 ] . $smarty->ds;
        }
        $cached->filepath .= $_filepath;
        $basename = $source->handler->getBasename($source);
        if (!empty($basename)) {
            $cached->filepath .= '.' . $basename;
        }
        if ($smarty->cache_locking) {
            $cached->lock_id = $cached->filepath . '.lock';
        }
        $cached->filepath .= '.php';
        $cached->timestamp = $cached->exists = is_file($cached->filepath);
        if ($cached->exists) {
            $cached->timestamp = filemtime($cached->filepath);
        }
    }

    /**
     * populate Cached Object with timestamp and exists from Resource
     *
     * @param Smarty_Template_Cached $cached cached object
     *
     * @return void
     */
    public function populateTimestamp(Smarty_Template_Cached $cached)
    {
        $cached->timestamp = $cached->exists = is_file($cached->filepath);
        if ($cached->exists) {
            $cached->timestamp = filemtime($cached->filepath);
        }
    }

    /**
     * Read the cached template and process its header
     *
     * @param \Smarty_Internal_Template $_smarty_tpl do not change variable name, is used by compiled template
     * @param Smarty_Template_Cached    $cached      cached object
     * @param bool                      $update      flag if called because cache update
     *
     * @return boolean true or false if the cached content does not exist
     */
    public function process(Smarty_Internal_Template $_smarty_tpl, Smarty_Template_Cached $cached = null,
                            $update = false)
    {
        $_smarty_tpl->cached->valid = false;
        if ($update && defined('HHVM_VERSION')) {
            eval("?>" . file_get_contents($_smarty_tpl->cached->filepath));
            return true;
        } else {
            return @include $_smarty_tpl->cached->filepath;
        }
    }

    /**
     * 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, $content)
    {
        if ($_template->smarty->ext->_writeFile->writeFile($_template->cached->filepath, $content,
                                                           $_template->smarty) === true
        ) {
            if (function_exists('opcache_invalidate') && strlen(ini_get("opcache.restrict_api")) < 1) {
                opcache_invalidate($_template->cached->filepath, true);
            } elseif (function_exists('apc_compile_file')) {
                apc_compile_file($_template->cached->filepath);
            }
            $cached = $_template->cached;
            $cached->timestamp = $cached->exists = is_file($cached->filepath);
            if ($cached->exists) {
                $cached->timestamp = filemtime($cached->filepath);
                return true;
            }
        }
        return false;
    }

    /**
     * Read cached template from cache
     *
     * @param  Smarty_Internal_Template $_template template object
     *
     * @return string  content
     */
    public function readCachedContent(Smarty_Internal_Template $_template)
    {
        if (is_file($_template->cached->filepath)) {
            return file_get_contents($_template->cached->filepath);
        }
        return false;
    }

    /**
     * Empty cache
     *
     * @param Smarty  $smarty
     * @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)
    {
        return $smarty->ext->_cacheResourceFile->clear($smarty, null, null, null, $exp_time);
    }

    /**
     * Empty cache for a specific template
     *
     * @param Smarty  $smarty
     * @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)
    {
        return $smarty->ext->_cacheResourceFile->clear($smarty, $resource_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)
    {
        if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
            clearstatcache(true, $cached->lock_id);
        } else {
            clearstatcache();
        }
        if (is_file($cached->lock_id)) {
            $t = filemtime($cached->lock_id);
            return $t && (time() - $t < $smarty->locking_timeout);
        } else {
            return false;
        }
    }

    /**
     * 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)
    {
        $cached->is_locked = true;
        touch($cached->lock_id);
    }

    /**
     * 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)
    {
        $cached->is_locked = false;
        @unlink($cached->lock_id);
    }
}
