843 lines
21 KiB
PHP
843 lines
21 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 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://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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* Output Class
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*
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* Responsible for sending final output to the browser.
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Output
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/libraries/output.html
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*/
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class CI_Output {
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/**
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* Final output string
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*
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* @var string
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*/
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public $final_output;
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/**
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* Cache expiration time
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*
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* @var int
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*/
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public $cache_expiration = 0;
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/**
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* List of server headers
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*
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* @var array
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*/
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public $headers = array();
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/**
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* List of mime types
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*
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* @var array
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*/
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public $mimes = array();
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/**
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* Mime-type for the current page
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*
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* @var string
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*/
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protected $mime_type = 'text/html';
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/**
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* Enable Profiler flag
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*
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* @var bool
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*/
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public $enable_profiler = FALSE;
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/**
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* php.ini zlib.output_compression flag
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*
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* @var bool
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*/
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protected $_zlib_oc = FALSE;
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/**
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* CI output compression flag
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*
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* @var bool
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*/
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protected $_compress_output = FALSE;
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/**
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* List of profiler sections
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*
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* @var array
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*/
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protected $_profiler_sections = array();
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/**
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* Parse markers flag
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*
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* Whether or not to parse variables like {elapsed_time} and {memory_usage}.
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*
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* @var bool
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*/
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public $parse_exec_vars = TRUE;
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/**
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* mbstring.func_overload flag
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*
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* @var bool
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*/
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protected static $func_overload;
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/**
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* Class constructor
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*
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* Determines whether zLib output compression will be used.
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*
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* @return void
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*/
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public function __construct()
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{
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$this->_zlib_oc = (bool) ini_get('zlib.output_compression');
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$this->_compress_output = (
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$this->_zlib_oc === FALSE
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&& config_item('compress_output') === TRUE
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&& extension_loaded('zlib')
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);
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isset(self::$func_overload) OR self::$func_overload = (extension_loaded('mbstring') && ini_get('mbstring.func_overload'));
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// Get mime types for later
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$this->mimes =& get_mimes();
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log_message('info', 'Output Class Initialized');
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}
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// --------------------------------------------------------------------
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/**
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* Get Output
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*
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* Returns the current output string.
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*
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* @return string
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*/
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public function get_output()
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{
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return $this->final_output;
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}
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// --------------------------------------------------------------------
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/**
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* Set Output
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*
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* Sets the output string.
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*
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* @param string $output Output data
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* @return CI_Output
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*/
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public function set_output($output)
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{
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$this->final_output = $output;
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Append Output
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*
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* Appends data onto the output string.
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*
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* @param string $output Data to append
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* @return CI_Output
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*/
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public function append_output($output)
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{
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$this->final_output .= $output;
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Set Header
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*
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* Lets you set a server header which will be sent with the final output.
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*
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* Note: If a file is cached, headers will not be sent.
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* @todo We need to figure out how to permit headers to be cached.
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*
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* @param string $header Header
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* @param bool $replace Whether to replace the old header value, if already set
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* @return CI_Output
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*/
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public function set_header($header, $replace = TRUE)
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{
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// If zlib.output_compression is enabled it will compress the output,
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// but it will not modify the content-length header to compensate for
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// the reduction, causing the browser to hang waiting for more data.
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// We'll just skip content-length in those cases.
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if ($this->_zlib_oc && strncasecmp($header, 'content-length', 14) === 0)
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{
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return $this;
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}
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$this->headers[] = array($header, $replace);
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Set Content-Type Header
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*
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* @param string $mime_type Extension of the file we're outputting
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* @param string $charset Character set (default: NULL)
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* @return CI_Output
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*/
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public function set_content_type($mime_type, $charset = NULL)
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{
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if (strpos($mime_type, '/') === FALSE)
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{
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$extension = ltrim($mime_type, '.');
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// Is this extension supported?
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if (isset($this->mimes[$extension]))
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{
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$mime_type =& $this->mimes[$extension];
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if (is_array($mime_type))
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{
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$mime_type = current($mime_type);
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}
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}
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}
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$this->mime_type = $mime_type;
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if (empty($charset))
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{
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$charset = config_item('charset');
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}
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$header = 'Content-Type: '.$mime_type
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.(empty($charset) ? '' : '; charset='.$charset);
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$this->headers[] = array($header, TRUE);
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Get Current Content-Type Header
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*
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* @return string 'text/html', if not already set
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*/
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public function get_content_type()
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{
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for ($i = 0, $c = count($this->headers); $i < $c; $i++)
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{
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if (sscanf($this->headers[$i][0], 'Content-Type: %[^;]', $content_type) === 1)
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{
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return $content_type;
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}
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}
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return 'text/html';
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}
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// --------------------------------------------------------------------
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/**
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* Get Header
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*
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* @param string $header
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* @return string
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*/
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public function get_header($header)
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{
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// Combine headers already sent with our batched headers
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$headers = array_merge(
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// We only need [x][0] from our multi-dimensional array
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array_map('array_shift', $this->headers),
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headers_list()
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);
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if (empty($headers) OR empty($header))
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{
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return NULL;
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}
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// Count backwards, in order to get the last matching header
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for ($c = count($headers) - 1; $c > -1; $c--)
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{
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if (strncasecmp($header, $headers[$c], $l = self::strlen($header)) === 0)
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{
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return trim(self::substr($headers[$c], $l+1));
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}
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}
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return NULL;
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}
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// --------------------------------------------------------------------
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/**
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* Set HTTP Status Header
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*
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* As of version 1.7.2, this is an alias for common function
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* set_status_header().
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*
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* @param int $code Status code (default: 200)
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* @param string $text Optional message
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* @return CI_Output
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*/
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public function set_status_header($code = 200, $text = '')
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{
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set_status_header($code, $text);
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Enable/disable Profiler
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*
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* @param bool $val TRUE to enable or FALSE to disable
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* @return CI_Output
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*/
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public function enable_profiler($val = TRUE)
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{
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$this->enable_profiler = is_bool($val) ? $val : TRUE;
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Set Profiler Sections
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*
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* Allows override of default/config settings for
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* Profiler section display.
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*
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* @param array $sections Profiler sections
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* @return CI_Output
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*/
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public function set_profiler_sections($sections)
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{
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if (isset($sections['query_toggle_count']))
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{
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$this->_profiler_sections['query_toggle_count'] = (int) $sections['query_toggle_count'];
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unset($sections['query_toggle_count']);
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}
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foreach ($sections as $section => $enable)
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{
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$this->_profiler_sections[$section] = ($enable !== FALSE);
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}
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Set Cache
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*
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* @param int $time Cache expiration time in minutes
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* @return CI_Output
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*/
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public function cache($time)
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{
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$this->cache_expiration = is_numeric($time) ? $time : 0;
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return $this;
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}
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// --------------------------------------------------------------------
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/**
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* Display Output
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*
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* Processes and sends finalized output data to the browser along
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* with any server headers and profile data. It also stops benchmark
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* timers so the page rendering speed and memory usage can be shown.
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*
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* Note: All "view" data is automatically put into $this->final_output
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* by controller class.
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*
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* @uses CI_Output::$final_output
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* @param string $output Output data override
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* @return void
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*/
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public function _display($output = '')
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{
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// Note: We use load_class() because we can't use $CI =& get_instance()
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// since this function is sometimes called by the caching mechanism,
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// which happens before the CI super object is available.
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$BM =& load_class('Benchmark', 'core');
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$CFG =& load_class('Config', 'core');
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// Grab the super object if we can.
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if (class_exists('CI_Controller', FALSE))
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{
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$CI =& get_instance();
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}
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// --------------------------------------------------------------------
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// Set the output data
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if ($output === '')
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{
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$output =& $this->final_output;
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}
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// --------------------------------------------------------------------
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// Do we need to write a cache file? Only if the controller does not have its
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// own _output() method and we are not dealing with a cache file, which we
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// can determine by the existence of the $CI object above
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if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output'))
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{
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$this->_write_cache($output);
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}
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// --------------------------------------------------------------------
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// Parse out the elapsed time and memory usage,
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// then swap the pseudo-variables with the data
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$elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end');
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if ($this->parse_exec_vars === TRUE)
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{
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$memory = round(memory_get_usage() / 1024 / 1024, 2).'MB';
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$output = str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output);
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}
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// --------------------------------------------------------------------
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// Is compression requested?
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if (isset($CI) // This means that we're not serving a cache file, if we were, it would already be compressed
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&& $this->_compress_output === TRUE
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&& isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
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{
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ob_start('ob_gzhandler');
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}
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// --------------------------------------------------------------------
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// Are there any server headers to send?
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if (count($this->headers) > 0)
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{
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foreach ($this->headers as $header)
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{
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@header($header[0], $header[1]);
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}
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}
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// --------------------------------------------------------------------
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// Does the $CI object exist?
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// If not we know we are dealing with a cache file so we'll
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// simply echo out the data and exit.
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if ( ! isset($CI))
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{
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if ($this->_compress_output === TRUE)
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{
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if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
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{
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header('Content-Encoding: gzip');
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header('Content-Length: '.self::strlen($output));
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}
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else
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{
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// User agent doesn't support gzip compression,
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// so we'll have to decompress our cache
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$output = gzinflate(self::substr($output, 10, -8));
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}
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}
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echo $output;
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log_message('info', 'Final output sent to browser');
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log_message('debug', 'Total execution time: '.$elapsed);
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return;
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}
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// --------------------------------------------------------------------
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// Do we need to generate profile data?
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// If so, load the Profile class and run it.
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if ($this->enable_profiler === TRUE)
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{
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$CI->load->library('profiler');
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if ( ! empty($this->_profiler_sections))
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{
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$CI->profiler->set_sections($this->_profiler_sections);
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}
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// If the output data contains closing </body> and </html> tags
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// we will remove them and add them back after we insert the profile data
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$output = preg_replace('|</body>.*?</html>|is', '', $output, -1, $count).$CI->profiler->run();
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if ($count > 0)
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{
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$output .= '</body></html>';
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}
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}
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// Does the controller contain a function named _output()?
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// If so send the output there. Otherwise, echo it.
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if (method_exists($CI, '_output'))
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{
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$CI->_output($output);
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}
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else
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{
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echo $output; // Send it to the browser!
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}
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log_message('info', 'Final output sent to browser');
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log_message('debug', 'Total execution time: '.$elapsed);
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}
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// --------------------------------------------------------------------
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/**
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* Write Cache
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*
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* @param string $output Output data to cache
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* @return void
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*/
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public function _write_cache($output)
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{
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$CI =& get_instance();
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$path = $CI->config->item('cache_path');
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$cache_path = ($path === '') ? APPPATH.'cache/' : $path;
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if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
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{
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log_message('error', 'Unable to write cache file: '.$cache_path);
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return;
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}
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$uri = $CI->config->item('base_url')
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.$CI->config->item('index_page')
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.$CI->uri->uri_string();
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if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
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{
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if (is_array($cache_query_string))
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{
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$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
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}
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else
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{
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$uri .= '?'.$_SERVER['QUERY_STRING'];
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}
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}
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$cache_path .= md5($uri);
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if ( ! $fp = @fopen($cache_path, 'w+b'))
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{
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log_message('error', 'Unable to write cache file: '.$cache_path);
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return;
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}
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if ( ! flock($fp, LOCK_EX))
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{
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log_message('error', 'Unable to secure a file lock for file at: '.$cache_path);
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fclose($fp);
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return;
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}
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// If output compression is enabled, compress the cache
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// itself, so that we don't have to do that each time
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// we're serving it
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if ($this->_compress_output === TRUE)
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{
|
|
$output = gzencode($output);
|
|
|
|
if ($this->get_header('content-type') === NULL)
|
|
{
|
|
$this->set_content_type($this->mime_type);
|
|
}
|
|
}
|
|
|
|
$expire = time() + ($this->cache_expiration * 60);
|
|
|
|
// Put together our serialized info.
|
|
$cache_info = serialize(array(
|
|
'expire' => $expire,
|
|
'headers' => $this->headers
|
|
));
|
|
|
|
$output = $cache_info.'ENDCI--->'.$output;
|
|
|
|
for ($written = 0, $length = self::strlen($output); $written < $length; $written += $result)
|
|
{
|
|
if (($result = fwrite($fp, self::substr($output, $written))) === FALSE)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
flock($fp, LOCK_UN);
|
|
fclose($fp);
|
|
|
|
if ( ! is_int($result))
|
|
{
|
|
@unlink($cache_path);
|
|
log_message('error', 'Unable to write the complete cache content at: '.$cache_path);
|
|
return;
|
|
}
|
|
|
|
chmod($cache_path, 0640);
|
|
log_message('debug', 'Cache file written: '.$cache_path);
|
|
|
|
// Send HTTP cache-control headers to browser to match file cache settings.
|
|
$this->set_cache_header($_SERVER['REQUEST_TIME'], $expire);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Update/serve cached output
|
|
*
|
|
* @uses CI_Config
|
|
* @uses CI_URI
|
|
*
|
|
* @param object &$CFG CI_Config class instance
|
|
* @param object &$URI CI_URI class instance
|
|
* @return bool TRUE on success or FALSE on failure
|
|
*/
|
|
public function _display_cache(&$CFG, &$URI)
|
|
{
|
|
$cache_path = ($CFG->item('cache_path') === '') ? APPPATH.'cache/' : $CFG->item('cache_path');
|
|
|
|
// Build the file path. The file name is an MD5 hash of the full URI
|
|
$uri = $CFG->item('base_url').$CFG->item('index_page').$URI->uri_string;
|
|
|
|
if (($cache_query_string = $CFG->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
|
|
{
|
|
if (is_array($cache_query_string))
|
|
{
|
|
$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
|
|
}
|
|
else
|
|
{
|
|
$uri .= '?'.$_SERVER['QUERY_STRING'];
|
|
}
|
|
}
|
|
|
|
$filepath = $cache_path.md5($uri);
|
|
|
|
if ( ! file_exists($filepath) OR ! $fp = @fopen($filepath, 'rb'))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
flock($fp, LOCK_SH);
|
|
|
|
$cache = (filesize($filepath) > 0) ? fread($fp, filesize($filepath)) : '';
|
|
|
|
flock($fp, LOCK_UN);
|
|
fclose($fp);
|
|
|
|
// Look for embedded serialized file info.
|
|
if ( ! preg_match('/^(.*)ENDCI--->/', $cache, $match))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
$cache_info = unserialize($match[1]);
|
|
$expire = $cache_info['expire'];
|
|
|
|
$last_modified = filemtime($filepath);
|
|
|
|
// Has the file expired?
|
|
if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))
|
|
{
|
|
// If so we'll delete it.
|
|
@unlink($filepath);
|
|
log_message('debug', 'Cache file has expired. File deleted.');
|
|
return FALSE;
|
|
}
|
|
|
|
// Send the HTTP cache control headers
|
|
$this->set_cache_header($last_modified, $expire);
|
|
|
|
// Add headers from cache file.
|
|
foreach ($cache_info['headers'] as $header)
|
|
{
|
|
$this->set_header($header[0], $header[1]);
|
|
}
|
|
|
|
// Display the cache
|
|
$this->_display(self::substr($cache, self::strlen($match[0])));
|
|
log_message('debug', 'Cache file is current. Sending it to browser.');
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Delete cache
|
|
*
|
|
* @param string $uri URI string
|
|
* @return bool
|
|
*/
|
|
public function delete_cache($uri = '')
|
|
{
|
|
$CI =& get_instance();
|
|
$cache_path = $CI->config->item('cache_path');
|
|
if ($cache_path === '')
|
|
{
|
|
$cache_path = APPPATH.'cache/';
|
|
}
|
|
|
|
if ( ! is_dir($cache_path))
|
|
{
|
|
log_message('error', 'Unable to find cache path: '.$cache_path);
|
|
return FALSE;
|
|
}
|
|
|
|
if (empty($uri))
|
|
{
|
|
$uri = $CI->uri->uri_string();
|
|
|
|
if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
|
|
{
|
|
if (is_array($cache_query_string))
|
|
{
|
|
$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
|
|
}
|
|
else
|
|
{
|
|
$uri .= '?'.$_SERVER['QUERY_STRING'];
|
|
}
|
|
}
|
|
}
|
|
|
|
$cache_path .= md5($CI->config->item('base_url').$CI->config->item('index_page').ltrim($uri, '/'));
|
|
|
|
if ( ! @unlink($cache_path))
|
|
{
|
|
log_message('error', 'Unable to delete cache file for '.$uri);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Set Cache Header
|
|
*
|
|
* Set the HTTP headers to match the server-side file cache settings
|
|
* in order to reduce bandwidth.
|
|
*
|
|
* @param int $last_modified Timestamp of when the page was last modified
|
|
* @param int $expiration Timestamp of when should the requested page expire from cache
|
|
* @return void
|
|
*/
|
|
public function set_cache_header($last_modified, $expiration)
|
|
{
|
|
$max_age = $expiration - $_SERVER['REQUEST_TIME'];
|
|
|
|
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $last_modified <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))
|
|
{
|
|
$this->set_status_header(304);
|
|
exit;
|
|
}
|
|
|
|
header('Pragma: public');
|
|
header('Cache-Control: max-age='.$max_age.', public');
|
|
header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT');
|
|
header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' GMT');
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Byte-safe strlen()
|
|
*
|
|
* @param string $str
|
|
* @return int
|
|
*/
|
|
protected static function strlen($str)
|
|
{
|
|
return (self::$func_overload)
|
|
? mb_strlen($str, '8bit')
|
|
: strlen($str);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Byte-safe substr()
|
|
*
|
|
* @param string $str
|
|
* @param int $start
|
|
* @param int $length
|
|
* @return string
|
|
*/
|
|
protected static function substr($str, $start, $length = NULL)
|
|
{
|
|
if (self::$func_overload)
|
|
{
|
|
// mb_substr($str, $start, null, '8bit') returns an empty
|
|
// string on PHP 5.3
|
|
isset($length) OR $length = ($start >= 0 ? self::strlen($str) - $start : -$start);
|
|
return mb_substr($str, $start, $length, '8bit');
|
|
}
|
|
|
|
return isset($length)
|
|
? substr($str, $start, $length)
|
|
: substr($str, $start);
|
|
}
|
|
}
|