source/extend/smarty/plugins/function.fetch.php

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<?php
/**
 * Smarty plugin
 *
 * @package Smarty
 * @subpackage PluginsFunction
 */

/**
 * Smarty {fetch} plugin
 *
 * Type:     function<br>
 * Name:     fetch<br>
 * Purpose:  fetch file, web or ftp data and display results
 *
 * @link http://www.smarty.net/manual/en/language.function.fetch.php {fetch}
 *       (Smarty online manual)
 * @author Monte Ohrt <monte at ohrt dot com>
 * @param array                    $params   parameters
 * @param Smarty_Internal_Template $template template object
 * @return string|null if the assign parameter is passed, Smarty assigns the result to a template variable
 */
function smarty_function_fetch($params, $template)
{
    if (empty($params['file'])) {
        trigger_error("[plugin] fetch parameter 'file' cannot be empty",E_USER_NOTICE);
        return;
    }
    
    // strip file protocol
    if (stripos($params['file'], 'file://') === 0) {
        $params['file'] = substr($params['file'], 7);
    }
    
    $protocol = strpos($params['file'], '://');
    if ($protocol !== false) {
        $protocol = strtolower(substr($params['file'], 0, $protocol));
    }
    
    if (isset($template->smarty->security_policy)) {
        if ($protocol) {
            // remote resource (or php stream, …)
            if(!$template->smarty->security_policy->isTrustedUri($params['file'])) {
                return;
            }
        } else {
            // local file
            if(!$template->smarty->security_policy->isTrustedResourceDir($params['file'])) {
                return;
            }
        }
    }

    $content = '';
    if ($protocol == 'http') {
        // http fetch
        if($uri_parts = parse_url($params['file'])) {
            // set defaults
            $host = $server_name = $uri_parts['host'];
            $timeout = 30;