library/smarty/libs/sysplugins/smarty_internal_write_file.php
author Markus Bröker <broeker.markus@googlemail.com>
Sat, 14 Nov 2015 02:40:44 +0100
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<?php
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/**
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 * Smarty write file plugin
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 *
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 * @package    Smarty
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 * @subpackage PluginsInternal
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 * @author     Monte Ohrt
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 */
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/**
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 * Smarty Internal Write File Class
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 *
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 * @package    Smarty
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 * @subpackage PluginsInternal
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 */
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class Smarty_Internal_Write_File {
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    /**
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     * Writes file in a safe way to disk
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     *
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     * @param  string $_filepath complete filepath
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     * @param  string $_contents file content
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     * @param  Smarty $smarty smarty instance
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     *
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     * @throws SmartyException
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     * @return boolean true
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     */
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    public function writeFile($_filepath, $_contents, Smarty $smarty) {
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        $_error_reporting = error_reporting();
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        error_reporting($_error_reporting & ~E_NOTICE & ~E_WARNING);
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        if ($smarty->_file_perms !== null) {
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            $old_umask = umask(0);
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        }
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        $_dirpath = dirname($_filepath);
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        // if subdirs, create dir structure
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        if ($_dirpath !== '.' && !file_exists($_dirpath)) {
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            mkdir($_dirpath, $smarty->_dir_perms === null ? 0777 : $smarty->_dir_perms, true);
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        }
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        // write to tmp file, then move to overt file lock race condition
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        $_tmp_file = $_dirpath . DS . str_replace(array('.', ','), '_', uniqid('wrt', true));
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        if (!file_put_contents($_tmp_file, $_contents)) {
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            error_reporting($_error_reporting);
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            throw new SmartyException("unable to write file {$_tmp_file}");
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        }
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        /*
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         * Windows' rename() fails if the destination exists,
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         * Linux' rename() properly handles the overwrite.
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         * Simply unlink()ing a file might cause other processes
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         * currently reading that file to fail, but linux' rename()
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         * seems to be smart enough to handle that for us.
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         */
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        if (Smarty::$_IS_WINDOWS) {
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            // remove original file
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            if (is_file($_filepath)) {
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                @unlink($_filepath);
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            }
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            // rename tmp file
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            $success = @rename($_tmp_file, $_filepath);
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        } else {
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            // rename tmp file
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            $success = @rename($_tmp_file, $_filepath);
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            if (!$success) {
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                // remove original file
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                if (is_file($_filepath)) {
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                    @unlink($_filepath);
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                }
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                // rename tmp file
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                $success = @rename($_tmp_file, $_filepath);
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            }
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        }
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        if (!$success) {
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            error_reporting($_error_reporting);
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            throw new SmartyException("unable to write file {$_filepath}");
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        }
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        if ($smarty->_file_perms !== null) {
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            // set file permissions
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            chmod($_filepath, $smarty->_file_perms);
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            umask($old_umask);
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        }
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        error_reporting($_error_reporting);
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        return true;
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    }
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}