summaryrefslogtreecommitdiff
path: root/includes/Feed.php
blob: ef33c78ffbd1534ed919bc8f5238273d5065666d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
<?php
/**
 * Basic support for outputting syndication feeds in RSS, other formats.
 *
 * Contain a feed class as well as classes to build rss / atom ... feeds
 * Available feeds are defined in Defines.php
 *
 * Copyright © 2004 Brion Vibber <brion@pobox.com>
 * http://www.mediawiki.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * @defgroup Feed Feed
 */

/**
 * A base class for basic support for outputting syndication feeds in RSS and other formats.
 *
 * @ingroup Feed
 */
class FeedItem {
	/**
	 * @var Title
	 */
	var $Title = 'Wiki';
	var $Description = '';
	var $Url = '';
	var $Date = '';
	var $Author = '';
	var $UniqueId = '';
	var $RSSIsPermalink;

	/**
	 * Constructor
	 *
	 * @param $Title String|Title Item's title
	 * @param $Description String
	 * @param $Url String: URL uniquely designating the item.
	 * @param $Date String: Item's date
	 * @param $Author String: Author's user name
	 * @param $Comments String
	 */
	function __construct( $Title, $Description, $Url, $Date = '', $Author = '', $Comments = '' ) {
		$this->Title = $Title;
		$this->Description = $Description;
		$this->Url = $Url;
		$this->UniqueId = $Url;
		$this->RSSIsPermalink = false;
		$this->Date = $Date;
		$this->Author = $Author;
		$this->Comments = $Comments;
	}

	/**
	 * Get the last touched timestamp
	 *
	 * @return String last-touched timestamp
	 */
	public function getLastMod() {
		return $this->Title->getTouched();
	}

	/**
	 * Encode $string so that it can be safely embedded in a XML document
	 *
	 * @param $string String: string to encode
	 * @return String
	 */
	public function xmlEncode( $string ) {
		$string = str_replace( "\r\n", "\n", $string );
		$string = preg_replace( '/[\x00-\x08\x0b\x0c\x0e-\x1f]/', '', $string );
		return htmlspecialchars( $string );
	}

	/**
	 * Get the unique id of this item
	 *
	 * @return String
	 */
	public function getUniqueId() {
		if ( $this->UniqueId ) {
			return $this->xmlEncode( $this->UniqueId );
		}
	}

	/**
	 * set the unique id of an item
	 *
	 * @param $uniqueId String: unique id for the item
	 * @param $RSSisPermalink Boolean: set to true if the guid (unique id) is a permalink (RSS feeds only)
	 */
	public function setUniqueId($uniqueId, $RSSisPermalink = false) {
		$this->UniqueId = $uniqueId;
		$this->RSSIsPermalink = $RSSisPermalink;
	}

	/**
	 * Get the title of this item; already xml-encoded
	 *
	 * @return String
	 */
	public function getTitle() {
		return $this->xmlEncode( $this->Title );
	}

	/**
	 * Get the DB prefixed title
	 *
	 * @return String the prefixed title, with underscores and
	 *  any interwiki and namespace prefixes
	 */
	public function getDBPrefixedTitle() {
		return $this->Title->getPrefixedDBKey();
	}

	/**
	 * Get the URL of this item; already xml-encoded
	 *
	 * @return String
	 */
	public function getUrl() {
		return $this->xmlEncode( $this->Url );
	}

	/**
	 * Get the description of this item; already xml-encoded
	 *
	 * @return String
	 */
	public function getDescription() {
		return $this->xmlEncode( $this->Description );
	}

	/**
	 * Get the language of this item
	 *
	 * @return String
	 */
	public function getLanguage() {
		global $wgLanguageCode;
		return $wgLanguageCode;
	}

	/**
	 * Get the title of this item
	 *
	 * @return String
	 */
	public function getDate() {
		return $this->Date;
	}

	/**
	 * Get the author of this item; already xml-encoded
	 *
	 * @return String
	 */
	public function getAuthor() {
		return $this->xmlEncode( $this->Author );
	}

	/**
	 * Get the comment of this item; already xml-encoded
	 *
	 * @return String
	 */
	public function getComments() {
		return $this->xmlEncode( $this->Comments );
	}

	/**
	 * Quickie hack... strip out wikilinks to more legible form from the comment.
	 *
	 * @param $text String: wikitext
	 * @return String
	 */
	public static function stripComment( $text ) {
		return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
	}
	/**#@-*/
}

/**
 * @todo document (needs one-sentence top-level class description).
 * @ingroup Feed
 */
class ChannelFeed extends FeedItem {
	/**#@+
	 * Abstract function, override!
	 * @abstract
	 */

	/**
	 * Generate Header of the feed
	 */
	function outHeader() {
		# print "<feed>";
	}

	/**
	 * Generate an item
	 * @param $item
	 */
	function outItem( $item ) {
		# print "<item>...</item>";
	}

	/**
	 * Generate Footer of the feed
	 */
	function outFooter() {
		# print "</feed>";
	}
	/**#@-*/

	/**
	 * Setup and send HTTP headers. Don't send any content;
	 * content might end up being cached and re-sent with
	 * these same headers later.
	 *
	 * This should be called from the outHeader() method,
	 * but can also be called separately.
	 */
	public function httpHeaders() {
		global $wgOut, $wgVaryOnXFP;

		# We take over from $wgOut, excepting its cache header info
		$wgOut->disable();
		$mimetype = $this->contentType();
		header( "Content-type: $mimetype; charset=UTF-8" );
		if ( $wgVaryOnXFP ) {
			$wgOut->addVaryHeader( 'X-Forwarded-Proto' );
		}
		$wgOut->sendCacheControl();

	}

	/**
	 * Return an internet media type to be sent in the headers.
	 *
	 * @return string
	 * @private
	 */
	function contentType() {
		global $wgRequest;
		$ctype = $wgRequest->getVal('ctype','application/xml');
		$allowedctypes = array('application/xml','text/xml','application/rss+xml','application/atom+xml');
		return (in_array($ctype, $allowedctypes) ? $ctype : 'application/xml');
	}

	/**
	 * Output the initial XML headers with a stylesheet for legibility
	 * if someone finds it in a browser.
	 * @private
	 */
	function outXmlHeader() {
		global $wgStylePath, $wgStyleVersion;

		$this->httpHeaders();
		echo '<?xml version="1.0"?>' . "\n";
		echo '<?xml-stylesheet type="text/css" href="' .
			htmlspecialchars( wfExpandUrl( "$wgStylePath/common/feed.css?$wgStyleVersion", PROTO_CURRENT ) ) .
			'"?' . ">\n";
	}
}

/**
 * Generate a RSS feed
 *
 * @ingroup Feed
 */
class RSSFeed extends ChannelFeed {

	/**
	 * Format a date given a timestamp
	 *
	 * @param $ts Integer: timestamp
	 * @return String: date string
	 */
	function formatTime( $ts ) {
		return gmdate( 'D, d M Y H:i:s \G\M\T', wfTimestamp( TS_UNIX, $ts ) );
	}

	/**
	 * Ouput an RSS 2.0 header
	 */
	function outHeader() {
		global $wgVersion;

		$this->outXmlHeader();
		?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">
	<channel>
		<title><?php print $this->getTitle() ?></title>
		<link><?php print wfExpandUrl( $this->getUrl(), PROTO_CURRENT ) ?></link>
		<description><?php print $this->getDescription() ?></description>
		<language><?php print $this->getLanguage() ?></language>
		<generator>MediaWiki <?php print $wgVersion ?></generator>
		<lastBuildDate><?php print $this->formatTime( wfTimestampNow() ) ?></lastBuildDate>
<?php
	}

	/**
	 * Output an RSS 2.0 item
	 * @param $item FeedItem: item to be output
	 */
	function outItem( $item ) {
	?>
		<item>
			<title><?php print $item->getTitle() ?></title>
			<link><?php print wfExpandUrl( $item->getUrl(), PROTO_CURRENT ) ?></link>
			<guid<?php if( !$item->RSSIsPermalink ) print ' isPermaLink="false"' ?>><?php print $item->getUniqueId() ?></guid>
			<description><?php print $item->getDescription() ?></description>
			<?php if( $item->getDate() ) { ?><pubDate><?php print $this->formatTime( $item->getDate() ) ?></pubDate><?php } ?>
			<?php if( $item->getAuthor() ) { ?><dc:creator><?php print $item->getAuthor() ?></dc:creator><?php }?>
			<?php if( $item->getComments() ) { ?><comments><?php print wfExpandUrl( $item->getComments(), PROTO_CURRENT ) ?></comments><?php }?>
		</item>
<?php
	}

	/**
	 * Ouput an RSS 2.0 footer
	 */
	function outFooter() {
	?>
	</channel>
</rss><?php
	}
}

/**
 * Generate an Atom feed
 *
 * @ingroup Feed
 */
class AtomFeed extends ChannelFeed {
	/**
	 * @todo document
	 */
	function formatTime( $ts ) {
		// need to use RFC 822 time format at least for rss2.0
		return gmdate( 'Y-m-d\TH:i:s', wfTimestamp( TS_UNIX, $ts ) );
	}

	/**
	 * Outputs a basic header for Atom 1.0 feeds.
	 */
	function outHeader() {
		global $wgVersion;

		$this->outXmlHeader();
		?><feed xmlns="http://www.w3.org/2005/Atom" xml:lang="<?php print $this->getLanguage() ?>">
		<id><?php print $this->getFeedId() ?></id>
		<title><?php print $this->getTitle() ?></title>
		<link rel="self" type="application/atom+xml" href="<?php print wfExpandUrl( $this->getSelfUrl(), PROTO_CURRENT ) ?>"/>
		<link rel="alternate" type="text/html" href="<?php print wfExpandUrl( $this->getUrl(), PROTO_CURRENT ) ?>"/>
		<updated><?php print $this->formatTime( wfTimestampNow() ) ?>Z</updated>
		<subtitle><?php print $this->getDescription() ?></subtitle>
		<generator>MediaWiki <?php print $wgVersion ?></generator>

<?php
	}

	/**
	 * Atom 1.0 requires a unique, opaque IRI as a unique indentifier
	 * for every feed we create. For now just use the URL, but who
	 * can tell if that's right? If we put options on the feed, do we
	 * have to change the id? Maybe? Maybe not.
	 *
	 * @return string
	 * @private
	 */
	function getFeedId() {
		return $this->getSelfUrl();
	}

	/**
	 * Atom 1.0 requests a self-reference to the feed.
	 * @return string
	 * @private
	 */
	function getSelfUrl() {
		global $wgRequest;
		return htmlspecialchars( $wgRequest->getFullRequestURL() );
	}

	/**
	 * Output a given item.
	 * @param $item
	 */
	function outItem( $item ) {
		global $wgMimeType;
	?>
	<entry>
		<id><?php print $item->getUniqueId() ?></id>
		<title><?php print $item->getTitle() ?></title>
		<link rel="alternate" type="<?php print $wgMimeType ?>" href="<?php print wfExpandUrl( $item->getUrl(), PROTO_CURRENT ) ?>"/>
		<?php if( $item->getDate() ) { ?>
		<updated><?php print $this->formatTime( $item->getDate() ) ?>Z</updated>
		<?php } ?>

		<summary type="html"><?php print $item->getDescription() ?></summary>
		<?php if( $item->getAuthor() ) { ?><author><name><?php print $item->getAuthor() ?></name></author><?php }?>
	</entry>

<?php /* @todo FIXME: Need to add comments
	<?php if( $item->getComments() ) { ?><dc:comment><?php print $item->getComments() ?></dc:comment><?php }?>
	  */
	}

	/**
	 * Outputs the footer for Atom 1.0 feed (basicly '\</feed\>').
	 */
	function outFooter() {?>
	</feed><?php
	}
}