[289] | 1 | <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
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| 2 | /** |
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| 3 | * CodeIgniter |
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| 4 | * |
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| 5 | * An open source application development framework for PHP 5.1.6 or newer |
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| 6 | * |
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| 7 | * @package CodeIgniter |
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| 8 | * @author ExpressionEngine Dev Team |
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| 9 | * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. |
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| 10 | * @license http://codeigniter.com/user_guide/license.html |
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| 11 | * @link http://codeigniter.com |
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| 12 | * @since Version 1.0 |
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| 13 | * @filesource |
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| 14 | */ |
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| 15 | |
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| 16 | // ------------------------------------------------------------------------ |
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| 17 | |
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| 18 | /** |
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| 19 | * Output Class |
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| 20 | * |
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| 21 | * Responsible for sending final output to browser |
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| 22 | * |
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| 23 | * @package CodeIgniter |
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| 24 | * @subpackage Libraries |
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| 25 | * @category Output |
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| 26 | * @author ExpressionEngine Dev Team |
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| 27 | * @link http://codeigniter.com/user_guide/libraries/output.html |
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| 28 | */ |
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| 29 | class CI_Output { |
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| 30 | |
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| 31 | /** |
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| 32 | * Current output string |
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| 33 | * |
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| 34 | * @var string |
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| 35 | * @access protected |
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| 36 | */ |
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| 37 | protected $final_output; |
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| 38 | /** |
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| 39 | * Cache expiration time |
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| 40 | * |
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| 41 | * @var int |
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| 42 | * @access protected |
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| 43 | */ |
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| 44 | protected $cache_expiration = 0; |
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| 45 | /** |
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| 46 | * List of server headers |
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| 47 | * |
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| 48 | * @var array |
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| 49 | * @access protected |
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| 50 | */ |
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| 51 | protected $headers = array(); |
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| 52 | /** |
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| 53 | * List of mime types |
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| 54 | * |
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| 55 | * @var array |
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| 56 | * @access protected |
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| 57 | */ |
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| 58 | protected $mime_types = array(); |
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| 59 | /** |
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| 60 | * Determines wether profiler is enabled |
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| 61 | * |
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| 62 | * @var book |
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| 63 | * @access protected |
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| 64 | */ |
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| 65 | protected $enable_profiler = FALSE; |
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| 66 | /** |
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| 67 | * Determines if output compression is enabled |
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| 68 | * |
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| 69 | * @var bool |
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| 70 | * @access protected |
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| 71 | */ |
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| 72 | protected $_zlib_oc = FALSE; |
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| 73 | /** |
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| 74 | * List of profiler sections |
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| 75 | * |
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| 76 | * @var array |
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| 77 | * @access protected |
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| 78 | */ |
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| 79 | protected $_profiler_sections = array(); |
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| 80 | /** |
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| 81 | * Whether or not to parse variables like {elapsed_time} and {memory_usage} |
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| 82 | * |
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| 83 | * @var bool |
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| 84 | * @access protected |
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| 85 | */ |
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| 86 | protected $parse_exec_vars = TRUE; |
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| 87 | |
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| 88 | /** |
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| 89 | * Constructor |
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| 90 | * |
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| 91 | */ |
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| 92 | function __construct() |
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| 93 | { |
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| 94 | $this->_zlib_oc = @ini_get('zlib.output_compression'); |
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| 95 | |
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| 96 | // Get mime types for later |
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| 97 | if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/mimes.php')) |
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| 98 | { |
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| 99 | include APPPATH.'config/'.ENVIRONMENT.'/mimes.php'; |
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| 100 | } |
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| 101 | else |
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| 102 | { |
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| 103 | include APPPATH.'config/mimes.php'; |
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| 104 | } |
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| 105 | |
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| 106 | |
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| 107 | $this->mime_types = $mimes; |
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| 108 | |
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| 109 | log_message('debug', "Output Class Initialized"); |
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| 110 | } |
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| 111 | |
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| 112 | // -------------------------------------------------------------------- |
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| 113 | |
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| 114 | /** |
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| 115 | * Get Output |
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| 116 | * |
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| 117 | * Returns the current output string |
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| 118 | * |
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| 119 | * @access public |
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| 120 | * @return string |
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| 121 | */ |
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| 122 | function get_output() |
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| 123 | { |
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| 124 | return $this->final_output; |
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| 125 | } |
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| 126 | |
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| 127 | // -------------------------------------------------------------------- |
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| 128 | |
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| 129 | /** |
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| 130 | * Set Output |
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| 131 | * |
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| 132 | * Sets the output string |
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| 133 | * |
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| 134 | * @access public |
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| 135 | * @param string |
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| 136 | * @return void |
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| 137 | */ |
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| 138 | function set_output($output) |
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| 139 | { |
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| 140 | $this->final_output = $output; |
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| 141 | |
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| 142 | return $this; |
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| 143 | } |
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| 144 | |
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| 145 | // -------------------------------------------------------------------- |
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| 146 | |
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| 147 | /** |
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| 148 | * Append Output |
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| 149 | * |
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| 150 | * Appends data onto the output string |
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| 151 | * |
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| 152 | * @access public |
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| 153 | * @param string |
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| 154 | * @return void |
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| 155 | */ |
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| 156 | function append_output($output) |
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| 157 | { |
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| 158 | if ($this->final_output == '') |
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| 159 | { |
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| 160 | $this->final_output = $output; |
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| 161 | } |
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| 162 | else |
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| 163 | { |
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| 164 | $this->final_output .= $output; |
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| 165 | } |
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| 166 | |
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| 167 | return $this; |
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| 168 | } |
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| 169 | |
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| 170 | // -------------------------------------------------------------------- |
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| 171 | |
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| 172 | /** |
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| 173 | * Set Header |
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| 174 | * |
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| 175 | * Lets you set a server header which will be outputted with the final display. |
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| 176 | * |
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| 177 | * Note: If a file is cached, headers will not be sent. We need to figure out |
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| 178 | * how to permit header data to be saved with the cache data... |
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| 179 | * |
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| 180 | * @access public |
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| 181 | * @param string |
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| 182 | * @param bool |
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| 183 | * @return void |
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| 184 | */ |
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| 185 | function set_header($header, $replace = TRUE) |
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| 186 | { |
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| 187 | // If zlib.output_compression is enabled it will compress the output, |
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| 188 | // but it will not modify the content-length header to compensate for |
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| 189 | // the reduction, causing the browser to hang waiting for more data. |
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| 190 | // We'll just skip content-length in those cases. |
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| 191 | |
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| 192 | if ($this->_zlib_oc && strncasecmp($header, 'content-length', 14) == 0) |
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| 193 | { |
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| 194 | return; |
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| 195 | } |
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| 196 | |
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| 197 | $this->headers[] = array($header, $replace); |
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| 198 | |
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| 199 | return $this; |
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| 200 | } |
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| 201 | |
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| 202 | // -------------------------------------------------------------------- |
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| 203 | |
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| 204 | /** |
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| 205 | * Set Content Type Header |
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| 206 | * |
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| 207 | * @access public |
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| 208 | * @param string extension of the file we're outputting |
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| 209 | * @return void |
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| 210 | */ |
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| 211 | function set_content_type($mime_type) |
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| 212 | { |
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| 213 | if (strpos($mime_type, '/') === FALSE) |
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| 214 | { |
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| 215 | $extension = ltrim($mime_type, '.'); |
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| 216 | |
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| 217 | // Is this extension supported? |
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| 218 | if (isset($this->mime_types[$extension])) |
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| 219 | { |
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| 220 | $mime_type =& $this->mime_types[$extension]; |
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| 221 | |
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| 222 | if (is_array($mime_type)) |
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| 223 | { |
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| 224 | $mime_type = current($mime_type); |
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| 225 | } |
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| 226 | } |
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| 227 | } |
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| 228 | |
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| 229 | $header = 'Content-Type: '.$mime_type; |
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| 230 | |
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| 231 | $this->headers[] = array($header, TRUE); |
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| 232 | |
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| 233 | return $this; |
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| 234 | } |
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| 235 | |
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| 236 | // -------------------------------------------------------------------- |
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| 237 | |
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| 238 | /** |
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| 239 | * Set HTTP Status Header |
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| 240 | * moved to Common procedural functions in 1.7.2 |
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| 241 | * |
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| 242 | * @access public |
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| 243 | * @param int the status code |
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| 244 | * @param string |
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| 245 | * @return void |
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| 246 | */ |
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| 247 | function set_status_header($code = 200, $text = '') |
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| 248 | { |
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| 249 | set_status_header($code, $text); |
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| 250 | |
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| 251 | return $this; |
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| 252 | } |
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| 253 | |
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| 254 | // -------------------------------------------------------------------- |
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| 255 | |
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| 256 | /** |
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| 257 | * Enable/disable Profiler |
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| 258 | * |
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| 259 | * @access public |
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| 260 | * @param bool |
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| 261 | * @return void |
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| 262 | */ |
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| 263 | function enable_profiler($val = TRUE) |
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| 264 | { |
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| 265 | $this->enable_profiler = (is_bool($val)) ? $val : TRUE; |
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| 266 | |
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| 267 | return $this; |
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| 268 | } |
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| 269 | |
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| 270 | // -------------------------------------------------------------------- |
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| 271 | |
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| 272 | /** |
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| 273 | * Set Profiler Sections |
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| 274 | * |
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| 275 | * Allows override of default / config settings for Profiler section display |
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| 276 | * |
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| 277 | * @access public |
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| 278 | * @param array |
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| 279 | * @return void |
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| 280 | */ |
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| 281 | function set_profiler_sections($sections) |
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| 282 | { |
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| 283 | foreach ($sections as $section => $enable) |
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| 284 | { |
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| 285 | $this->_profiler_sections[$section] = ($enable !== FALSE) ? TRUE : FALSE; |
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| 286 | } |
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| 287 | |
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| 288 | return $this; |
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| 289 | } |
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| 290 | |
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| 291 | // -------------------------------------------------------------------- |
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| 292 | |
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| 293 | /** |
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| 294 | * Set Cache |
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| 295 | * |
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| 296 | * @access public |
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| 297 | * @param integer |
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| 298 | * @return void |
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| 299 | */ |
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| 300 | function cache($time) |
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| 301 | { |
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| 302 | $this->cache_expiration = ( ! is_numeric($time)) ? 0 : $time; |
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| 303 | |
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| 304 | return $this; |
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| 305 | } |
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| 306 | |
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| 307 | // -------------------------------------------------------------------- |
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| 308 | |
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| 309 | /** |
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| 310 | * Display Output |
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| 311 | * |
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| 312 | * All "view" data is automatically put into this variable by the controller class: |
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| 313 | * |
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| 314 | * $this->final_output |
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| 315 | * |
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| 316 | * This function sends the finalized output data to the browser along |
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| 317 | * with any server headers and profile data. It also stops the |
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| 318 | * benchmark timer so the page rendering speed and memory usage can be shown. |
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| 319 | * |
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| 320 | * @access public |
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| 321 | * @param string |
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| 322 | * @return mixed |
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| 323 | */ |
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| 324 | function _display($output = '') |
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| 325 | { |
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| 326 | // Note: We use globals because we can't use $CI =& get_instance() |
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| 327 | // since this function is sometimes called by the caching mechanism, |
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| 328 | // which happens before the CI super object is available. |
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| 329 | global $BM, $CFG; |
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| 330 | |
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| 331 | // Grab the super object if we can. |
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| 332 | if (class_exists('CI_Controller')) |
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| 333 | { |
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| 334 | $CI =& get_instance(); |
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| 335 | } |
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| 336 | |
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| 337 | // -------------------------------------------------------------------- |
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| 338 | |
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| 339 | // Set the output data |
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| 340 | if ($output == '') |
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| 341 | { |
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| 342 | $output =& $this->final_output; |
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| 343 | } |
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| 344 | |
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| 345 | // -------------------------------------------------------------------- |
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| 346 | |
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| 347 | // Do we need to write a cache file? Only if the controller does not have its |
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| 348 | // own _output() method and we are not dealing with a cache file, which we |
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| 349 | // can determine by the existence of the $CI object above |
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| 350 | if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output')) |
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| 351 | { |
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| 352 | $this->_write_cache($output); |
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| 353 | } |
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| 354 | |
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| 355 | // -------------------------------------------------------------------- |
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| 356 | |
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| 357 | // Parse out the elapsed time and memory usage, |
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| 358 | // then swap the pseudo-variables with the data |
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| 359 | |
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| 360 | $elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end'); |
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| 361 | |
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| 362 | if ($this->parse_exec_vars === TRUE) |
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| 363 | { |
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| 364 | $memory = ( ! function_exists('memory_get_usage')) ? '0' : round(memory_get_usage()/1024/1024, 2).'MB'; |
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| 365 | |
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| 366 | $output = str_replace('{elapsed_time}', $elapsed, $output); |
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| 367 | $output = str_replace('{memory_usage}', $memory, $output); |
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| 368 | } |
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| 369 | |
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| 370 | // -------------------------------------------------------------------- |
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| 371 | |
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| 372 | // Is compression requested? |
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| 373 | if ($CFG->item('compress_output') === TRUE && $this->_zlib_oc == FALSE) |
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| 374 | { |
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| 375 | if (extension_loaded('zlib')) |
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| 376 | { |
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| 377 | if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) AND strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE) |
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| 378 | { |
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| 379 | ob_start('ob_gzhandler'); |
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| 380 | } |
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| 381 | } |
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| 382 | } |
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| 383 | |
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| 384 | // -------------------------------------------------------------------- |
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| 385 | |
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| 386 | // Are there any server headers to send? |
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| 387 | if (count($this->headers) > 0) |
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| 388 | { |
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| 389 | foreach ($this->headers as $header) |
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| 390 | { |
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| 391 | @header($header[0], $header[1]); |
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| 392 | } |
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| 393 | } |
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| 394 | |
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| 395 | // -------------------------------------------------------------------- |
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| 396 | |
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| 397 | // Does the $CI object exist? |
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| 398 | // If not we know we are dealing with a cache file so we'll |
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| 399 | // simply echo out the data and exit. |
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| 400 | if ( ! isset($CI)) |
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| 401 | { |
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| 402 | echo $output; |
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| 403 | log_message('debug', "Final output sent to browser"); |
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| 404 | log_message('debug', "Total execution time: ".$elapsed); |
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| 405 | return TRUE; |
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| 406 | } |
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| 407 | |
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| 408 | // -------------------------------------------------------------------- |
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| 409 | |
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| 410 | // Do we need to generate profile data? |
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| 411 | // If so, load the Profile class and run it. |
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| 412 | if ($this->enable_profiler == TRUE) |
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| 413 | { |
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| 414 | $CI->load->library('profiler'); |
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| 415 | |
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| 416 | if ( ! empty($this->_profiler_sections)) |
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| 417 | { |
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| 418 | $CI->profiler->set_sections($this->_profiler_sections); |
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| 419 | } |
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| 420 | |
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| 421 | // If the output data contains closing </body> and </html> tags |
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| 422 | // we will remove them and add them back after we insert the profile data |
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| 423 | if (preg_match("|</body>.*?</html>|is", $output)) |
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| 424 | { |
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| 425 | $output = preg_replace("|</body>.*?</html>|is", '', $output); |
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| 426 | $output .= $CI->profiler->run(); |
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| 427 | $output .= '</body></html>'; |
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| 428 | } |
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| 429 | else |
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| 430 | { |
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| 431 | $output .= $CI->profiler->run(); |
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| 432 | } |
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| 433 | } |
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| 434 | |
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| 435 | // -------------------------------------------------------------------- |
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| 436 | |
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| 437 | // Does the controller contain a function named _output()? |
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| 438 | // If so send the output there. Otherwise, echo it. |
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| 439 | if (method_exists($CI, '_output')) |
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| 440 | { |
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| 441 | $CI->_output($output); |
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| 442 | } |
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| 443 | else |
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| 444 | { |
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| 445 | echo $output; // Send it to the browser! |
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| 446 | } |
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| 447 | |
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| 448 | log_message('debug', "Final output sent to browser"); |
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| 449 | log_message('debug', "Total execution time: ".$elapsed); |
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| 450 | } |
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| 451 | |
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| 452 | // -------------------------------------------------------------------- |
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| 453 | |
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| 454 | /** |
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| 455 | * Write a Cache File |
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| 456 | * |
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| 457 | * @access public |
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| 458 | * @param string |
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| 459 | * @return void |
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| 460 | */ |
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| 461 | function _write_cache($output) |
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| 462 | { |
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| 463 | $CI =& get_instance(); |
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| 464 | $path = $CI->config->item('cache_path'); |
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| 465 | |
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| 466 | $cache_path = ($path == '') ? APPPATH.'cache/' : $path; |
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| 467 | |
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| 468 | if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path)) |
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| 469 | { |
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| 470 | log_message('error', "Unable to write cache file: ".$cache_path); |
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| 471 | return; |
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| 472 | } |
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| 473 | |
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| 474 | $uri = $CI->config->item('base_url'). |
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| 475 | $CI->config->item('index_page'). |
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| 476 | $CI->uri->uri_string(); |
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| 477 | |
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| 478 | $cache_path .= md5($uri); |
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| 479 | |
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| 480 | if ( ! $fp = @fopen($cache_path, FOPEN_WRITE_CREATE_DESTRUCTIVE)) |
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| 481 | { |
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| 482 | log_message('error', "Unable to write cache file: ".$cache_path); |
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| 483 | return; |
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| 484 | } |
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| 485 | |
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| 486 | $expire = time() + ($this->cache_expiration * 60); |
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| 487 | |
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| 488 | if (flock($fp, LOCK_EX)) |
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| 489 | { |
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| 490 | fwrite($fp, $expire.'TS--->'.$output); |
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| 491 | flock($fp, LOCK_UN); |
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| 492 | } |
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| 493 | else |
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| 494 | { |
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| 495 | log_message('error', "Unable to secure a file lock for file at: ".$cache_path); |
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| 496 | return; |
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| 497 | } |
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| 498 | fclose($fp); |
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| 499 | @chmod($cache_path, FILE_WRITE_MODE); |
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| 500 | |
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| 501 | log_message('debug', "Cache file written: ".$cache_path); |
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| 502 | } |
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| 503 | |
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| 504 | // -------------------------------------------------------------------- |
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| 505 | |
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| 506 | /** |
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| 507 | * Update/serve a cached file |
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| 508 | * |
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| 509 | * @access public |
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| 510 | * @param object config class |
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| 511 | * @param object uri class |
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| 512 | * @return void |
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| 513 | */ |
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| 514 | function _display_cache(&$CFG, &$URI) |
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| 515 | { |
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| 516 | $cache_path = ($CFG->item('cache_path') == '') ? APPPATH.'cache/' : $CFG->item('cache_path'); |
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| 517 | |
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| 518 | // Build the file path. The file name is an MD5 hash of the full URI |
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| 519 | $uri = $CFG->item('base_url'). |
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| 520 | $CFG->item('index_page'). |
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| 521 | $URI->uri_string; |
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| 522 | |
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| 523 | $filepath = $cache_path.md5($uri); |
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| 524 | |
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| 525 | if ( ! @file_exists($filepath)) |
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| 526 | { |
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| 527 | return FALSE; |
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| 528 | } |
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| 529 | |
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| 530 | if ( ! $fp = @fopen($filepath, FOPEN_READ)) |
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| 531 | { |
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| 532 | return FALSE; |
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| 533 | } |
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| 534 | |
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| 535 | flock($fp, LOCK_SH); |
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| 536 | |
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| 537 | $cache = ''; |
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| 538 | if (filesize($filepath) > 0) |
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| 539 | { |
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| 540 | $cache = fread($fp, filesize($filepath)); |
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| 541 | } |
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| 542 | |
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| 543 | flock($fp, LOCK_UN); |
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| 544 | fclose($fp); |
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| 545 | |
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| 546 | // Strip out the embedded timestamp |
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| 547 | if ( ! preg_match("/(\d+TS--->)/", $cache, $match)) |
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| 548 | { |
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| 549 | return FALSE; |
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| 550 | } |
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| 551 | |
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| 552 | // Has the file expired? If so we'll delete it. |
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| 553 | if (time() >= trim(str_replace('TS--->', '', $match['1']))) |
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| 554 | { |
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| 555 | if (is_really_writable($cache_path)) |
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| 556 | { |
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| 557 | @unlink($filepath); |
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| 558 | log_message('debug', "Cache file has expired. File deleted"); |
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| 559 | return FALSE; |
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| 560 | } |
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| 561 | } |
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| 562 | |
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| 563 | // Display the cache |
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| 564 | $this->_display(str_replace($match['0'], '', $cache)); |
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| 565 | log_message('debug', "Cache file is current. Sending it to browser."); |
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| 566 | return TRUE; |
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| 567 | } |
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| 568 | |
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| 569 | |
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| 570 | } |
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| 571 | // END Output Class |
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| 572 | |
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| 573 | /* End of file Output.php */ |
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| 574 | /* Location: ./system/core/Output.php */ |
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