inc/classes/main/response/class_HttpResponse.php

   1 <?php
   2 /**
   3  * A class for an HTTP response on an HTTP request
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, this is free software
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.ship-simu.org
  10  *
  11  * This program is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  23  *
  24  * The extended headers are taken from phpMyAdmin setup tool, written by
  25  * Michal Cihar <michal@cihar.com>, licensed under GNU GPL 2.0.
  26  */
  27 class HttpResponse extends BaseFrameworkSystem implements Responseable {
  28         /**
  29          * Response status
  30          */
  31         private $responseStatus = "200 OK";
  32
  33         /**
  34          * Array with all headers
  35          */
  36         private $responseHeaders = array();
  37
  38         /**
  39          * Cookies we shall sent out
  40          */
  41         private $cookies = array();
  42
  43         /**
  44          * Body of the response
  45          */
  46         private $responseBody = "";
  47
  48         /**
  49          * Instance of the template engine
  50          */
  51         private $templateInstance = null;
  52
  53         /**
  54          * Fatal resolved messages from filters and so on
  55          */
  56         private $fatalMessages = array();
  57
  58         /**
  59          * Protected constructor
  60          *
  61          * @return      void
  62          */
  63         protected function __construct () {
  64                 // Call parent constructor
  65                 parent::__construct(__CLASS__);
  66
  67                 // Set part description
  68                 $this->setObjectDescription("HTTP response");
  69
  70                 // Create unique ID number
  71                 $this->generateUniqueId();
  72
  73                 // Clean up a little
  74                 $this->removeNumberFormaters();
  75                 $this->removeSystemArray();
  76         }
  77
  78         /**
  79          * Creates an object of this class
  80          *
  81          * @param       $appInstance            An instance of a manageable application
  82          * @return      $responseInstance       A prepared instance of this class
  83          */
  84         public final static function createHttpResponse (ManageableApplication $appInstance) {
  85                 // Get a new instance
  86                 $responseInstance = new HttpResponse();
  87
  88                 // Set the application instance
  89                 $responseInstance->setApplicationInstance($appInstance);
  90
  91                 // Initialize the template engine here
  92                 $responseInstance->initTemplateEngine($appInstance);
  93
  94                 // Return the prepared instance
  95                 return $responseInstance;
  96         }
  97
  98         /**
  99          * Setter for status
 100          *
 101          * @param       $status         New response status
 102          * @return      void
 103          */
 104         public final function setResponseStatus ($status) {
 105                 $this->responseStatus = (string) $status;
 106         }
 107
 108         /**
 109          * Add header element
 110          *
 111          * @param       $name   Name of header element
 112          * @param       $value  Value of header element
 113          * @return      void
 114          */
 115         public final function addHeader ($name, $value) {
 116                 $this->responseHeaders[$name] = $value;
 117         }
 118
 119         /**
 120          * Reset the header array
 121          *
 122          * @return      void
 123          */
 124         public final function resetResponseHeaders () {
 125                 $this->responseHeaders = array();
 126         }
 127
 128         /**
 129          * "Writes" data to the response body
 130          *
 131          * @param       $output         Output we shall sent in the HTTP response
 132          * @return      void
 133          */
 134         public function writeToBody ($output) {
 135                 $this->responseBody .= $output;
 136         }
 137
 138         /**
 139          * Sets the response body to something new
 140          *
 141          * @param       $output         Output we shall sent in the HTTP response
 142          * @return      void
 143          */
 144         public function setResponseBody ($output) {
 145                 $this->responseBody = $output;
 146         }
 147
 148         /**
 149          * Flushs the cached HTTP response to the outer world
 150          *
 151          * @param       $force  Wether we shall force the output or abort if headers are
 152          *                                      already sent with an exception
 153          * @return      void
 154          * @throws      ResponseHeadersAlreadySentException             Thrown if headers are
 155          *                                                                                                      already sent
 156          */
 157         public function flushBuffer ($force=false) {
 158                 if ((headers_sent()) && (!$force)) {
 159                         // Headers are already sent!
 160                         throw new ResponseHeadersAlreadySentException($this, self::EXCEPTION_HEADERS_ALREADY_SENT);
 161                 } elseif (!headers_sent()) {
 162                         // Send headers out
 163                         header("HTTP/1.1 {$this->responseStatus}");
 164
 165                         // Used later
 166                         $now = gmdate('D, d M Y H:i:s') . ' GMT';
 167
 168                         // General header for no caching
 169                         $this->addHeader('Expired', $now); // rfc2616 - Section 14.21
 170                         $this->addHeader('Last-Modified', $now);
 171                         $this->addHeader('Cache-Control', 'no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
 172                         $this->addHeader('Pragma', 'no-cache'); // HTTP/1.0
 173
 174                         // Define the charset to be used
 175                         //$this->addHeader('Content-Type:', sprintf("text/html; charset=%s", $this->getConfigInstance()->readConfig('header_charset')));
 176
 177                         foreach ($this->responseHeaders as $name=>$value) {
 178                                 header("{$name}: {$value}");
 179                         } // END - foreach
 180
 181                         // Send cookies out?
 182                         if (count($this->cookies) > 0) {
 183                                 // Send all cookies
 184                                 $cookieString = implode(" ", $this->cookies);
 185                                 header("Set-Cookie: {$cookieString}");
 186
 187                                 // Remove them all
 188                                 $this->cookies = array();
 189                         } // END - if
 190                 }
 191
 192                 // Are there some error messages?
 193                 if (count($this->fatalMessages) == 0) {
 194                         // Flush the output to the world
 195                         $this->getWebOutputInstance()->output($this->responseBody);
 196                 } else {
 197                         // Display all error messages
 198                         $this->getApplicationInstance()->handleFatalMessages($this->fatalMessages);
 199
 200                         // Send the error messages out to the world
 201                         $this->getWebOutputInstance()->output($this->responseBody);
 202                 }
 203
 204                 // Clear response header and body
 205                 $this->setResponseBody("");
 206                 $this->resetResponseHeaders();
 207         }
 208
 209         /**
 210          * Initializes the template engine instance
 211          *
 212          * @param       $appInstance    An instance of a manageable application
 213          * @return      void
 214          */
 215         public final function initTemplateEngine (ManageableApplication $appInstance) {
 216                 $this->setTemplateInstance($this->prepareTemplateInstance($appInstance));
 217         }
 218
 219         /**
 220          * Adds a fatal message id to the response. The added messages can then be
 221          * processed and outputed to the world
 222          *
 223          * @param       $messageId      The message id we shall add
 224          * @return      void
 225          */
 226         public final function addFatalMessage ($messageId) {
 227                 // Adds the resolved message id to the fatal message list
 228                 $this->fatalMessages[] = $this->getApplicationInstance()->getLanguageInstance()->getMessage($messageId);
 229         }
 230
 231         /**
 232          * Adds a cookie to the response
 233          *
 234          * @param       $cookieName             Cookie's name
 235          * @param       $cookieValue    Value to store in the cookie
 236          * @param       $encrypted              Do some extra encryption on the value
 237          * @param       $expires                Timestamp of expiration (default: configured)
 238          * @return      void
 239          * @throws      ResponseHeadersAlreadySentException             If headers are already sent
 240          * @todo        Encryption of cookie data not yet supported.
 241          * @todo        Why are these parameters conflicting?
 242          * @todo        If the return statement is removed and setcookie() commented out,
 243          * @todo        this will send only one cookie out, the first one.
 244          */
 245         public function addCookie ($cookieName, $cookieValue, $encrypted = false, $expires = null) {
 246                 //* DEBUG: */ echo $cookieName."=".$cookieValue."<br />\n";
 247                 // Are headers already sent?
 248                 if (headers_sent()) {
 249                         // Throw an exception here
 250                         //* DEBUG: */ return;
 251                         throw new ResponseHeadersAlreadySentException($this, self::EXCEPTION_HEADERS_ALREADY_SENT);
 252                 } // END - if
 253
 254                 // Shall we encrypt the cookie?
 255                 if ($encrypted === true) {
 256                 } // END - if
 257
 258                 // For slow browsers set the cookie array element first
 259                 $_COOKIE[$cookieName] = $cookieValue;
 260
 261                 // Get all config entries
 262                 if (is_null($expires)) {
 263                         $expires = (time() + $this->getConfigInstance()->readConfig('cookie_expire'));
 264                 } // END - if
 265
 266                 $path = $this->getConfigInstance()->readConfig('cookie_path');
 267                 $domain = $this->getConfigInstance()->readConfig('cookie_domain');
 268
 269                 setcookie($cookieName, $cookieValue, $expires);
 270                 //, $path, $domain, (isset($_SERVER['HTTPS']))
 271                 return;
 272
 273                 // Now construct the full header
 274                 $cookieString = $cookieName . "=" . $cookieValue . "; ";
 275                 $cookieString .= "expires=" . date("D, d-F-Y H:i:s", $expires) . " GMT";
 276                 // $cookieString .= "; path=".$path."; domain=".$domain;
 277
 278                 // Set the cookie as a header
 279                 $this->cookies[$cookieName] = $cookieString;
 280         }
 281
 282         /**
 283          * Redirect to a configured URL. The URL can be absolute or relative. In
 284          * case of relative URL it will be extended automatically.
 285          *
 286          * @param       $configEntry    The configuration entry which holds our URL
 287          * @return      void
 288          * @throws      ResponseHeadersAlreadySentException             If headers are already sent
 289          */
 290         public function redirectToConfiguredUrl ($configEntry) {
 291                 // Is the header not yet sent?
 292                 if (headers_sent()) {
 293                         // Throw an exception here
 294                         throw new ResponseHeadersAlreadySentException($this, self::EXCEPTION_HEADERS_ALREADY_SENT);
 295                 } // END - if
 296
 297                 // Get the url from config
 298                 $url = $this->getConfigInstance()->readConfig($configEntry);
 299
 300                 // Do we have a "http" in front of the URL?
 301                 if (substr(strtolower($url), 0, 4) != "http") {
 302                         // Is there a / in front of the relative URL?
 303                         if (substr($url, 0, 1) == "/") $url = substr($url, 1);
 304
 305                         // No, then extend it with our base URL
 306                         $url = $this->getConfigInstance()->readConfig('base_url') . "/" . $url;
 307                 } // END - if
 308
 309                 // Add redirect header
 310                 $this->addHeader("Location", $url);
 311
 312                 // Set correct response status
 313                 $this->setResponseStatus("301 Moved Permanently");
 314
 315                 // Clear the body
 316                 $this->setResponseBody("");
 317
 318                 // Flush the result
 319                 $this->flushBuffer();
 320
 321                 // All done here...
 322                 exit();
 323         }
 324
 325         /**
 326          * Expires the given cookie if it is set
 327          *
 328          * @param       $cookieName             Cookie to expire
 329          * @return      void
 330          */
 331         public function expireCookie ($cookieName) {
 332                 // Is the cookie there?
 333                 if (isset($_COOKIE[$cookieName])) {
 334                         // Then expire it with 20 minutes past
 335                         $this->addCookie($cookieName, "", false, (time() - 1200));
 336
 337                         // Remove it from array
 338                         unset($_COOKIE[$cookieName]);
 339                 } // END - if
 340         }
 341
 342         /**
 343          * Refreshs a given cookie. This will make the cookie live longer
 344          *
 345          * @param       $cookieName             Cookie to refresh
 346          * @return      void
 347          */
 348         public function refreshCookie ($cookieName) {
 349                 // Only update existing cookies
 350                 if (isset($_COOKIE[$cookieName])) {
 351                         // Update the cookie
 352                         $this->addCookie($cookieName, $_COOKIE[$cookieName], false);
 353                 } // END - if
 354         }
 355
 356         /**
 357          * Getter for default command
 358          *
 359          * @return      $defaultCommand         Default command for this response
 360          */
 361         public function getDefaultCommand () {
 362                 $defaultCommand = $this->getConfigInstance()->readConfig('default_web_command');
 363                 return $defaultCommand;
 364         }
 365 }
 366
 367 // [EOF]
 368 ?>