158 行
4.5 KiB
PHP
158 行
4.5 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2017, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* CodeIgniter Download Helpers
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*
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* @package CodeIgniter
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* @subpackage Helpers
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* @category Helpers
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/helpers/download_helper.html
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*/
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// ------------------------------------------------------------------------
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if ( ! function_exists('force_download'))
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{
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/**
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* Force Download
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*
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* Generates headers that force a download to happen
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*
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* @param string filename
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* @param mixed the data to be downloaded
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* @param bool whether to try and send the actual file MIME type
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* @return void
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*/
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function force_download($filename = '', $data = '', $set_mime = FALSE)
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{
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if ($filename === '' OR $data === '')
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{
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return;
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}
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elseif ($data === NULL)
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{
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if ( ! @is_file($filename) OR ($filesize = @filesize($filename)) === FALSE)
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{
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return;
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}
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$filepath = $filename;
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$filename = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $filename));
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$filename = end($filename);
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}
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else
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{
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$filesize = strlen($data);
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}
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// Set the default MIME type to send
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$mime = 'application/octet-stream';
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$x = explode('.', $filename);
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$extension = end($x);
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if ($set_mime === TRUE)
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{
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if (count($x) === 1 OR $extension === '')
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{
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/* If we're going to detect the MIME type,
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* we'll need a file extension.
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*/
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return;
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}
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// Load the mime types
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$mimes =& get_mimes();
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// Only change the default MIME if we can find one
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if (isset($mimes[$extension]))
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{
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$mime = is_array($mimes[$extension]) ? $mimes[$extension][0] : $mimes[$extension];
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}
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}
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/* It was reported that browsers on Android 2.1 (and possibly older as well)
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* need to have the filename extension upper-cased in order to be able to
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* download it.
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*
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* Reference: http://digiblog.de/2011/04/19/android-and-the-download-file-headers/
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*/
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if (count($x) !== 1 && isset($_SERVER['HTTP_USER_AGENT']) && preg_match('/Android\s(1|2\.[01])/', $_SERVER['HTTP_USER_AGENT']))
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{
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$x[count($x) - 1] = strtoupper($extension);
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$filename = implode('.', $x);
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}
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if ($data === NULL && ($fp = @fopen($filepath, 'rb')) === FALSE)
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{
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return;
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}
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// Clean output buffer
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if (ob_get_level() !== 0 && @ob_end_clean() === FALSE)
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{
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@ob_clean();
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}
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// Generate the server headers
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header('Content-Type: '.$mime);
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header('Content-Disposition: attachment; filename="'.$filename.'"');
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header('Expires: 0');
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header('Content-Transfer-Encoding: binary');
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header('Content-Length: '.$filesize);
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header('Cache-Control: private, no-transform, no-store, must-revalidate');
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// If we have raw data - just dump it
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if ($data !== NULL)
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{
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exit($data);
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}
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// Flush 1MB chunks of data
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while ( ! feof($fp) && ($data = fread($fp, 1048576)) !== FALSE)
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{
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echo $data;
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}
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fclose($fp);
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exit;
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}
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}
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