TODO tag rewritten, first login action (empty for now) added
[shipsimu.git] / 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 $templateEngine = 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->templateEngine = $this->prepareTemplateEngine($appInstance);
217         }
218
219         /**
220          * Getter for the template engine instance
221          *
222          * @return      $templateEngine         An instance of the used template engine
223          */
224         public final function getTemplateEngine () {
225                 return $this->templateEngine;
226         }
227
228         /**
229          * Adds a fatal message id to the response. The added messages can then be
230          * processed and outputed to the world
231          *
232          * @param       $messageId      The message id we shall add
233          * @return      void
234          */
235         public final function addFatalMessage ($messageId) {
236                 // Adds the resolved message id to the fatal message list
237                 $this->fatalMessages[] = $this->getApplicationInstance()->getLanguageInstance()->getMessage($messageId);
238         }
239
240         /**
241          * Adds a cookie to the response
242          *
243          * @param       $cookieName             Cookie's name
244          * @param       $cookieValue    Value to store in the cookie
245          * @param       $encrypted              Do some extra encryption on the value
246          * @param       $expires                Timestamp of expiration (default: configured)
247          * @return      void
248          * @throws      ResponseHeadersAlreadySentException             If headers are already sent
249          */
250         public function addCookie ($cookieName, $cookieValue, $encrypted = false, $expires = null) {
251                 // Are headers already sent?
252                 if (headers_sent()) {
253                         // Throw an exception here
254                         throw new ResponseHeadersAlreadySentException($this, self::EXCEPTION_HEADERS_ALREADY_SENT);
255                 } // END - if
256
257                 // Shall we encrypt the cookie?
258                 if ($encrypted === true) {
259                         /* @TODO Encryption of cookie data not yet supported */
260                 } // END - if
261
262                 // For slow browsers set the cookie array element first
263                 $_COOKIE[$cookieName] = $cookieValue;
264
265                 // Get all config entries
266                 if (is_null($expires)) {
267                         $expires = (time() + $this->getConfigInstance()->readConfig('cookie_expire'));
268                 } // END - if
269
270                 $path = $this->getConfigInstance()->readConfig('cookie_path');
271                 $domain = $this->getConfigInstance()->readConfig('cookie_domain');
272
273                 setcookie($cookieName, $cookieValue, $expires);
274                 /* @TODO Why are these parameters conflicting? */
275                 //, $path, $domain, (isset($_SERVER['HTTPS']))
276                 return;
277                 /* @TODO This will send only one cookie out, the first one. */
278
279                 // Now construct the full header
280                 $cookieString = $cookieName . "=" . $cookieValue . "; ";
281                 $cookieString .= "expires=" . date("D, d-F-Y H:i:s", $expires) . " GMT";
282                 /* @TODO Why are these parameters conflicting? */
283                 // $cookieString .= "; path=".$path."; domain=".$domain;
284
285                 // Set the cookie as a header
286                 $this->cookies[$cookieName] = $cookieString;
287         }
288
289         /**
290          * Redirect to a configured URL. The URL can be absolute or relative. In
291          * case of relative URL it will be extended automatically.
292          *
293          * @param       $configEntry    The configuration entry which holds our URL
294          * @return      void
295          * @throws      ResponseHeadersAlreadySentException             If headers are already sent
296          */
297         public function redirectToConfiguredUrl ($configEntry) {
298                 // Is the header not yet sent?
299                 if (headers_sent()) {
300                         // Throw an exception here
301                         throw new ResponseHeadersAlreadySentException($this, self::EXCEPTION_HEADERS_ALREADY_SENT);
302                 } // END - if
303
304                 // Get the url from config
305                 $url = $this->getConfigInstance()->readConfig($configEntry);
306
307                 // Do we have a "http" in front of the URL?
308                 if (substr(strtolower($url), 0, 4) != "http") {
309                         // Is there a / in front of the relative URL?
310                         if (substr($url, 0, 1) == "/") $url = substr($url, 1);
311
312                         // No, then extend it with our base URL
313                         $url = $this->getConfigInstance()->readConfig('base_url') . "/" . $url;
314                 } // END - if
315
316                 // Add redirect header
317                 $this->addHeader("Location", $url);
318
319                 // Set correct response status
320                 $this->setResponseStatus("301 Moved Permanently");
321
322                 // Clear the body
323                 $this->setResponseBody("");
324
325                 // Flush the result
326                 $this->flushBuffer();
327
328                 // All done here...
329                 exit();
330         }
331
332         /**
333          * Expires the given cookie if it is set
334          *
335          * @param       $cookieName             Cookie to expire
336          * @return      void
337          */
338         public function expireCookie ($cookieName) {
339                 // Is the cookie there?
340                 if (isset($_COOKIE[$cookieName])) {
341                         // Then expire it with 20 minutes past
342                         $this->addCookie($cookieName, "", false, (time() - 1200));
343
344                         // Remove it from array
345                         unset($_COOKIE[$cookieName]);
346                 } // END - if
347         }
348 }
349
350 // [EOF]
351 ?>