aboutsummaryrefslogtreecommitdiffhomepage
path: root/inc/3rdparty/makefulltextfeed.php
blob: 27a62d7324890d474dea4cead9bc5c451c45ec32 (plain) (blame)
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
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
<?php
// Full-Text RSS: Create Full-Text Feeds
// Author: Keyvan Minoukadeh
// Copyright (c) 2013 Keyvan Minoukadeh
// License: AGPLv3
// Version: 3.2
// Date: 2013-05-13
// More info: http://fivefilters.org/content-only/
// Help: http://help.fivefilters.org

/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 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 Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

// Usage
// -----
// Request this file passing it a web page or feed URL in the querystring: makefulltextfeed.php?url=example.org/article
// For more request parameters, see http://help.fivefilters.org/customer/portal/articles/226660-usage

//error_reporting(E_ALL ^ E_NOTICE);
ini_set("display_errors", 1);
@set_time_limit(120);
libxml_use_internal_errors(true); 


// Deal with magic quotes
if (get_magic_quotes_gpc()) {
	$process = array(&$_GET, &$_POST, &$_REQUEST);
	while (list($key, $val) = each($process)) {
		foreach ($val as $k => $v) {
			unset($process[$key][$k]);
			if (is_array($v)) {
				$process[$key][stripslashes($k)] = $v;
				$process[] = &$process[$key][stripslashes($k)];
			} else {
				$process[$key][stripslashes($k)] = stripslashes($v);
			}
		}
	}
	unset($process);
}

// set include path
set_include_path(realpath(dirname(__FILE__).'/libraries').PATH_SEPARATOR.get_include_path());

require_once dirname(__FILE__).'/makefulltextfeedHelpers.php';

////////////////////////////////
// Load config file
////////////////////////////////
require dirname(__FILE__).'/config.php';

////////////////////////////////
// Prevent indexing/following by search engines because:
// 1. The content is already public and presumably indexed (why create duplicates?)
// 2. Not doing so might increase number of requests from search engines, thus increasing server load
// Note: feed readers and services such as Yahoo Pipes will not be affected by this header.
// Note: Using Disallow in a robots.txt file will be more effective (search engines will check
// that before even requesting makefulltextfeed.php).
////////////////////////////////
header('X-Robots-Tag: noindex, nofollow');

////////////////////////////////
// Check if service is enabled
////////////////////////////////
if (!$options->enabled) {
	die('The full-text RSS service is currently disabled');
}

////////////////////////////////
// Debug mode?
// See the config file for debug options.
////////////////////////////////
$debug_mode = false;
if (isset($_GET['debug'])) {
	if ($options->debug === true || $options->debug == 'user') {
		$debug_mode = true;
	} elseif ($options->debug == 'admin') {
		session_start();
		$debug_mode = (@$_SESSION['auth'] == 1);
	}
	if ($debug_mode) {
		header('Content-Type: text/plain; charset=utf-8');
	} else {
		if ($options->debug == 'admin') {
			die('You must be logged in to the <a href="admin/">admin area</a> to see debug output.');
		} else {
			die('Debugging is disabled.');
		}
	}
}

////////////////////////////////
// Check for APC
////////////////////////////////
$options->apc = $options->apc && function_exists('apc_add');
if ($options->apc) {
	debug('APC is enabled and available on server');
} else {
	debug('APC is disabled or not available on server');
}

////////////////////////////////
// Check for smart cache
////////////////////////////////
$options->smart_cache = $options->smart_cache && function_exists('apc_inc');

////////////////////////////////
// Check for feed URL
////////////////////////////////
if (!isset($_GET['url'])) {
	die('No URL supplied');
}
$url = trim($_GET['url']);
if (strtolower(substr($url, 0, 7)) == 'feed://') {
	$url = 'http://'.substr($url, 7);
}
if (!preg_match('!^https?://.+!i', $url)) {
	$url = 'http://'.$url;
}

$url = filter_var($url, FILTER_SANITIZE_URL);
$test = filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
// deal with bug http://bugs.php.net/51192 (present in PHP 5.2.13 and PHP 5.3.2)
if ($test === false) {
	$test = filter_var(strtr($url, '-', '_'), FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);
}
if ($test !== false && $test !== null && preg_match('!^https?://!', $url)) {
	// all okay
	unset($test);
} else {
	die('Invalid URL supplied');
}
debug("Supplied URL: $url");

/////////////////////////////////
// Redirect to hide API key
/////////////////////////////////
if (isset($_GET['key']) && ($key_index = array_search($_GET['key'], $options->api_keys)) !== false) {
	$host = $_SERVER['HTTP_HOST'];
	$path = rtrim(dirname($_SERVER['SCRIPT_NAME']), '/\\');
	$_qs_url = (strtolower(substr($url, 0, 7)) == 'http://') ? substr($url, 7) : $url;
	$redirect = 'http://'.htmlspecialchars($host.$path).'/makefulltextfeed.php?url='.urlencode($_qs_url);
	$redirect .= '&key='.$key_index;
	$redirect .= '&hash='.urlencode(sha1($_GET['key'].$url));
	if (isset($_GET['html'])) $redirect .= '&html='.urlencode($_GET['html']);
	if (isset($_GET['max'])) $redirect .= '&max='.(int)$_GET['max'];
	if (isset($_GET['links'])) $redirect .= '&links='.urlencode($_GET['links']);
	if (isset($_GET['exc'])) $redirect .= '&exc='.urlencode($_GET['exc']);
	if (isset($_GET['format'])) $redirect .= '&format='.urlencode($_GET['format']);
	if (isset($_GET['callback'])) $redirect .= '&callback='.urlencode($_GET['callback']);
	if (isset($_GET['l'])) $redirect .= '&l='.urlencode($_GET['l']);
	if (isset($_GET['xss'])) $redirect .= '&xss';
	if (isset($_GET['use_extracted_title'])) $redirect .= '&use_extracted_title';
	if (isset($_GET['content'])) $redirect .= '&content='.urlencode($_GET['content']);
	if (isset($_GET['summary'])) $redirect .= '&summary='.urlencode($_GET['summary']);
	if (isset($_GET['debug'])) $redirect .= '&debug';
	if ($debug_mode) {
		debug('Redirecting to hide access key, follow URL below to continue');
		debug("Location: $redirect");
	} else {
		header("Location: $redirect");
	}
	exit;
}

///////////////////////////////////////////////
// Set timezone.
// Prevents warnings, but needs more testing -
// perhaps if timezone is set in php.ini we
// don't need to set it at all...
///////////////////////////////////////////////
if (!ini_get('date.timezone') || !@date_default_timezone_set(ini_get('date.timezone'))) {
	date_default_timezone_set('UTC');
}

///////////////////////////////////////////////
// Check if the request is explicitly for an HTML page
///////////////////////////////////////////////
$html_only = (isset($_GET['html']) && ($_GET['html'] == '1' || $_GET['html'] == 'true'));

///////////////////////////////////////////////
// Check if valid key supplied
///////////////////////////////////////////////
$valid_key = false;
if (isset($_GET['key']) && isset($_GET['hash']) && isset($options->api_keys[(int)$_GET['key']])) {
	$valid_key = ($_GET['hash'] == sha1($options->api_keys[(int)$_GET['key']].$url));
}
$key_index = ($valid_key) ? (int)$_GET['key'] : 0;
if (!$valid_key && $options->key_required) {
	die('A valid key must be supplied');
}
if (!$valid_key && isset($_GET['key']) && $_GET['key'] != '') {
	die('The entered key is invalid');
}

if (file_exists('custom_init.php')) require 'custom_init.php';

///////////////////////////////////////////////
// Check URL against list of blacklisted URLs
///////////////////////////////////////////////
if (!url_allowed($url)) die('URL blocked');

///////////////////////////////////////////////
// Max entries
// see config.php to find these values
///////////////////////////////////////////////
if (isset($_GET['max'])) {
	$max = (int)$_GET['max'];
	if ($valid_key) {
		$max = min($max, $options->max_entries_with_key);
	} else {
		$max = min($max, $options->max_entries);
	}
} else {
	if ($valid_key) {
		$max = $options->default_entries_with_key;
	} else {
		$max = $options->default_entries;
	}
}

///////////////////////////////////////////////
// Link handling
///////////////////////////////////////////////
if (isset($_GET['links']) && in_array($_GET['links'], array('preserve', 'footnotes', 'remove'))) {
	$links = $_GET['links'];
} else {
	$links = 'preserve';
}

///////////////////////////////////////////////
// Favour item titles in feed?
///////////////////////////////////////////////
$favour_feed_titles = true;
if ($options->favour_feed_titles == 'user') {
	$favour_feed_titles = !isset($_GET['use_extracted_title']);
} else {
	$favour_feed_titles = $options->favour_feed_titles;
}

///////////////////////////////////////////////
// Include full content in output?
///////////////////////////////////////////////
if ($options->content === 'user') {
	if (isset($_GET['content']) && $_GET['content'] === '0') {
		$options->content = false;
	} else {
		$options->content = true;
	}
}

///////////////////////////////////////////////
// Include summaries in output?
///////////////////////////////////////////////
if ($options->summary === 'user') {
	if (isset($_GET['summary']) && $_GET['summary'] === '1') {
		$options->summary = true;
	} else {
		$options->summary = false;
	}
}

///////////////////////////////////////////////
// Exclude items if extraction fails
///////////////////////////////////////////////
if ($options->exclude_items_on_fail === 'user') {
	$exclude_on_fail = (isset($_GET['exc']) && ($_GET['exc'] == '1'));
} else {
	$exclude_on_fail = $options->exclude_items_on_fail;
}

///////////////////////////////////////////////
// Detect language
///////////////////////////////////////////////
if ($options->detect_language === 'user') {
	if (isset($_GET['l'])) {
		$detect_language = (int)$_GET['l'];
	} else {
		$detect_language = 1;
	}
} else {
	$detect_language = $options->detect_language;
}

$use_cld = extension_loaded('cld') && (version_compare(PHP_VERSION, '5.3.0') >= 0);

/////////////////////////////////////
// Check for valid format
// (stick to RSS (or RSS as JSON) for the time being)
/////////////////////////////////////
if (isset($_GET['format']) && $_GET['format'] == 'json') {
	$format = 'json';
} else {
	$format = 'rss';
}

/////////////////////////////////////
// Should we do XSS filtering?
/////////////////////////////////////
if ($options->xss_filter === 'user') {
	$xss_filter = isset($_GET['xss']);
} else {
	$xss_filter = $options->xss_filter;
}
if (!$xss_filter && isset($_GET['xss'])) {
	die('XSS filtering is disabled in config');
}

/////////////////////////////////////
// Check for JSONP
// Regex from https://gist.github.com/1217080
/////////////////////////////////////
$callback = null;
if ($format =='json' && isset($_GET['callback'])) {
	$callback = trim($_GET['callback']);
	foreach (explode('.', $callback) as $_identifier) {
		if (!preg_match('/^[a-zA-Z_$][0-9a-zA-Z_$]*(?:\[(?:".+"|\'.+\'|\d+)\])*?$/', $_identifier)) {
			die('Invalid JSONP callback');
		}
	}
	debug("JSONP callback: $callback");
}

//////////////////////////////////
// Enable Cross-Origin Resource Sharing (CORS)
//////////////////////////////////
if ($options->cors) header('Access-Control-Allow-Origin: *');

//////////////////////////////////
// Check for cached copy
//////////////////////////////////
if ($options->caching) {
	debug('Caching is enabled...');
	$cache_id = md5($max.$url.(int)$valid_key.$links.(int)$favour_feed_titles.(int)$options->content.(int)$options->summary.(int)$xss_filter.(int)$exclude_on_fail.$format.$detect_language.(int)isset($_GET['pubsub']));
	$check_cache = true;
	if ($options->apc && $options->smart_cache) {
		apc_add("cache.$cache_id", 0, 10*60);
		$apc_cache_hits = (int)apc_fetch("cache.$cache_id");
		$check_cache = ($apc_cache_hits >= 2);
		apc_inc("cache.$cache_id");
		if ($check_cache) {
			debug('Cache key found in APC, we\'ll try to load cache file from disk');
		} else {
			debug('Cache key not found in APC');
		}
	}
	if ($check_cache) {
		$cache = get_cache();
		if ($data = $cache->load($cache_id)) {
			if ($debug_mode) {
				debug('Loaded cached copy');
				exit;
			}
			if ($format == 'json') {
				if ($callback === null) {
					header('Content-type: application/json; charset=UTF-8');
				} else {
					header('Content-type: application/javascript; charset=UTF-8');
				}
			} else {
				header('Content-type: text/xml; charset=UTF-8');
				header('X-content-type-options: nosniff');
			}
			if (headers_sent()) die('Some data has already been output, can\'t send RSS file');
			if ($callback) {
				echo "$callback($data);";
			} else {
				echo $data;
			}
			exit;
		}
	}
}

//////////////////////////////////
// Set Expires header
//////////////////////////////////
if (!$debug_mode) {
	header('Expires: ' . gmdate('D, d M Y H:i:s', time()+(60*10)) . ' GMT');
}

//////////////////////////////////
// Set up HTTP agent
//////////////////////////////////
global $http;
$http = new HumbleHttpAgent();
$http->debug = $debug_mode;
$http->userAgentMap = $options->user_agents;
$http->headerOnlyTypes = array_keys($options->content_type_exc);
$http->rewriteUrls = $options->rewrite_url;

//////////////////////////////////
// Set up Content Extractor
//////////////////////////////////
global $extractor;
$extractor = new ContentExtractor(dirname(__FILE__).'/site_config/custom', dirname(__FILE__).'/site_config/standard');
$extractor->debug = $debug_mode;
SiteConfig::$debug = $debug_mode;
SiteConfig::use_apc($options->apc);
$extractor->fingerprints = $options->fingerprints;
$extractor->allowedParsers = $options->allowed_parsers;

////////////////////////////////
// Get RSS/Atom feed
////////////////////////////////
if (!$html_only) {
	debug('--------');
	debug("Attempting to process URL as feed");
	// Send user agent header showing PHP (prevents a HTML response from feedburner)
	$http->userAgentDefault = HumbleHttpAgent::UA_PHP;
	// configure SimplePie HTTP extension class to use our HumbleHttpAgent instance
	SimplePie_HumbleHttpAgent::set_agent($http);
	$feed = new SimplePie();
	// some feeds use the text/html content type - force_feed tells SimplePie to process anyway
	$feed->force_feed(true);
	$feed->set_file_class('SimplePie_HumbleHttpAgent');
	//$feed->set_feed_url($url); // colons appearing in the URL's path get encoded
	$feed->feed_url = $url;
	$feed->set_autodiscovery_level(SIMPLEPIE_LOCATOR_NONE);
	$feed->set_timeout(20);
	$feed->enable_cache(false);
	$feed->set_stupidly_fast(true);
	$feed->enable_order_by_date(false); // we don't want to do anything to the feed
	$feed->set_url_replacements(array());
	// initialise the feed
	// the @ suppresses notices which on some servers causes a 500 internal server error
	$result = @$feed->init();
	//$feed->handle_content_type();
	//$feed->get_title();
	if ($result && (!is_array($feed->data) || count($feed->data) == 0)) {
		die('Sorry, no feed items found');
	}
	// from now on, we'll identify ourselves as a browser
	$http->userAgentDefault = HumbleHttpAgent::UA_BROWSER;
}

////////////////////////////////////////////////////////////////////////////////
// Our given URL is not a feed, so let's create our own feed with a single item:
// the given URL. This basically treats all non-feed URLs as if they were
// single-item feeds.
////////////////////////////////////////////////////////////////////////////////
$isDummyFeed = false;
if ($html_only || !$result) {
	debug('--------');
	debug("Constructing a single-item feed from URL");
	$isDummyFeed = true;
	unset($feed, $result);
	// create single item dummy feed object
	$feed = new DummySingleItemFeed($url);
}

////////////////////////////////////////////
// Create full-text feed
////////////////////////////////////////////
$output = new FeedWriter();
$output->setTitle(strip_tags($feed->get_title()));
$output->setDescription(strip_tags($feed->get_description()));
$output->setXsl('css/feed.xsl'); // Chrome uses this, most browsers ignore it
if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
	$output->addHub('http://fivefilters.superfeedr.com/');
	$output->addHub('http://pubsubhubbub.appspot.com/');
	$output->setSelf('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
}
$output->setLink($feed->get_link()); // Google Reader uses this for pulling in favicons
if ($img_url = $feed->get_image_url()) {
	$output->setImage($feed->get_title(), $feed->get_link(), $img_url);
}

////////////////////////////////////////////
// Loop through feed items
////////////////////////////////////////////
$items = $feed->get_items(0, $max);
// Request all feed items in parallel (if supported)
$urls_sanitized = array();
$urls = array();
foreach ($items as $key => $item) {
	$permalink = htmlspecialchars_decode($item->get_permalink());
	// Colons in URL path segments get encoded by SimplePie, yet some sites expect them unencoded
	$permalink = str_replace('%3A', ':', $permalink);
	// validateUrl() strips non-ascii characters
	// simplepie already sanitizes URLs so let's not do it again here.
	//$permalink = $http->validateUrl($permalink);
	if ($permalink) {
		$urls_sanitized[] = $permalink;
	}
	$urls[$key] = $permalink;
}
debug('--------');
debug('Fetching feed items');
$http->fetchAll($urls_sanitized);
//$http->cacheAll();

// count number of items added to full feed
$item_count = 0;

foreach ($items as $key => $item) {
	debug('--------');
	debug('Processing feed item '.($item_count+1));
	$do_content_extraction = true;
	$extract_result = false;
	$text_sample = null;
	$permalink = $urls[$key];
	debug("Item URL: $permalink");
	$extracted_title = '';
	$feed_item_title = $item->get_title();
	if ($feed_item_title !== null) {
		$feed_item_title = strip_tags(htmlspecialchars_decode($feed_item_title));
	}
	$newitem = $output->createNewItem();
	$newitem->setTitle($feed_item_title);
	if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
		if ($permalink !== false) {
			$newitem->setLink('http://fivefilters.org/content-only/redirect.php?url='.urlencode($permalink));
		} else {
			$newitem->setLink('http://fivefilters.org/content-only/redirect.php?url='.urlencode($item->get_permalink()));
		}
	} else {
		if ($permalink !== false) {
			$newitem->setLink($permalink);
		} else {
			$newitem->setLink($item->get_permalink());
		}
	}
	//if ($permalink && ($response = $http->get($permalink, true)) && $response['status_code'] < 300) {
	// Allowing error codes - some sites return correct content with error status
	// e.g. prospectmagazine.co.uk returns 403
	if ($permalink && ($response = $http->get($permalink, true)) && ($response['status_code'] < 300 || $response['status_code'] > 400)) {
		$effective_url = $response['effective_url'];
		if (!url_allowed($effective_url)) continue;
		// check if action defined for returned Content-Type
		$mime_info = get_mime_action_info($response['headers']);
		if (isset($mime_info['action'])) {
			if ($mime_info['action'] == 'exclude') {
				continue; // skip this feed item entry
			} elseif ($mime_info['action'] == 'link') {
				if ($mime_info['type'] == 'image') {
					$html = "<a href=\"$effective_url\"><img src=\"$effective_url\" alt=\"{$mime_info['name']}\" /></a>";
				} else {
					$html = "<a href=\"$effective_url\">Download {$mime_info['name']}</a>";
				}
				$extracted_title = $mime_info['name'];
				$do_content_extraction = false;
			}
		}
		if ($do_content_extraction) {
			$html = $response['body'];
			// remove strange things
			$html = str_replace('</[>', '', $html);
			$html = convert_to_utf8($html, $response['headers']);
			// check site config for single page URL - fetch it if found
			$is_single_page = false;
			if ($single_page_response = getSinglePage($item, $html, $effective_url)) {
				$is_single_page = true;
				$effective_url = $single_page_response['effective_url'];
				// check if action defined for returned Content-Type
				$mime_info = get_mime_action_info($single_page_response['headers']);
				if (isset($mime_info['action'])) {
					if ($mime_info['action'] == 'exclude') {
						continue; // skip this feed item entry
					} elseif ($mime_info['action'] == 'link') {
						if ($mime_info['type'] == 'image') {
							$html = "<a href=\"$effective_url\"><img src=\"$effective_url\" alt=\"{$mime_info['name']}\" /></a>";
						} else {
							$html = "<a href=\"$effective_url\">Download {$mime_info['name']}</a>";
						}
						$extracted_title = $mime_info['name'];
						$do_content_extraction = false;
					}
				}
				if ($do_content_extraction) {
					$html = $single_page_response['body'];
					// remove strange things
					$html = str_replace('</[>', '', $html);
					$html = convert_to_utf8($html, $single_page_response['headers']);
					debug("Retrieved single-page view from $effective_url");
				}
				unset($single_page_response);
			}
		}
		if ($do_content_extraction) {
			debug('--------');
			debug('Attempting to extract content');
			$extract_result = $extractor->process($html, $effective_url);
			$readability = $extractor->readability;
			$content_block = ($extract_result) ? $extractor->getContent() : null;
			$extracted_title = ($extract_result) ? $extractor->getTitle() : '';
			// Deal with multi-page articles
			//die('Next: '.$extractor->getNextPageUrl());
			$is_multi_page = (!$is_single_page && $extract_result && $extractor->getNextPageUrl());
			if ($options->multipage && $is_multi_page && $options->content) {
				debug('--------');
				debug('Attempting to process multi-page article');
				$multi_page_urls = array();
				$multi_page_content = array();
				while ($next_page_url = $extractor->getNextPageUrl()) {
					debug('--------');
					debug('Processing next page: '.$next_page_url);
					// If we've got URL, resolve against $url
					if ($next_page_url = makeAbsoluteStr($effective_url, $next_page_url)) {
						// check it's not what we have already!
						if (!in_array($next_page_url, $multi_page_urls)) {
							// it's not, so let's attempt to fetch it
							$multi_page_urls[] = $next_page_url;
							$_prev_ref = $http->referer;
							if (($response = $http->get($next_page_url, true)) && $response['status_code'] < 300) {
								// make sure mime type is not something with a different action associated
								$page_mime_info = get_mime_action_info($response['headers']);
								if (!isset($page_mime_info['action'])) {
									$html = $response['body'];
									// remove strange things
									$html = str_replace('</[>', '', $html);
									$html = convert_to_utf8($html, $response['headers']);
									if ($extractor->process($html, $next_page_url)) {
										$multi_page_content[] = $extractor->getContent();
										continue;
									} else { debug('Failed to extract content'); }
								} else { debug('MIME type requires different action'); }
							} else { debug('Failed to fetch URL'); }
						} else { debug('URL already processed'); }
					} else { debug('Failed to resolve against '.$effective_url); }
					// failed to process next_page_url, so cancel further requests
					$multi_page_content = array();
					break;
				}
				// did we successfully deal with this multi-page article?
				if (empty($multi_page_content)) {
					debug('Failed to extract all parts of multi-page article, so not going to include them');
					$_page = $readability->dom->createElement('p');
					$_page->innerHTML = '<em>This article appears to continue on subsequent pages which we could not extract</em>';
					$multi_page_content[] = $_page;
				}
				foreach ($multi_page_content as $_page) {
					$_page = $content_block->ownerDocument->importNode($_page, true);
					$content_block->appendChild($_page);
				}
				unset($multi_page_urls, $multi_page_content, $page_mime_info, $next_page_url, $_page);
			}
		}
		// use extracted title for both feed and item title if we're using single-item dummy feed
		if ($isDummyFeed) {
			$output->setTitle($extracted_title);
			$newitem->setTitle($extracted_title);
		} else {
			// use extracted title instead of feed item title?
			if (!$favour_feed_titles && $extracted_title != '') {
				debug('Using extracted title in generated feed');
				$newitem->setTitle($extracted_title);
			}
		}
	}
	if ($do_content_extraction) {
		// if we failed to extract content...
		if (!$extract_result) {
			if ($exclude_on_fail) {
				debug('Failed to extract, so skipping (due to exclude on fail parameter)');
				continue; // skip this and move to next item
			}
			//TODO: get text sample for language detection
			$html = $options->error_message;
			// keep the original item description
			$html .= $item->get_description();
		} else {
			$readability->clean($content_block, 'select');
			// get base URL
			$base_url = get_base_url($readability->dom);
			if (!$base_url) $base_url = $effective_url;
			// rewrite URLs
			if ($options->rewrite_relative_urls) makeAbsolute($base_url, $content_block);
			// footnotes
			if (($links == 'footnotes') && (strpos($effective_url, 'wikipedia.org') === false)) {
				$readability->addFootnotes($content_block);
			}
			// remove nesting: <div><div><div><p>test</p></div></div></div> = <p>test</p>
			while ($content_block->childNodes->length == 1 && $content_block->firstChild->nodeType === XML_ELEMENT_NODE) {
				// only follow these tag names
				if (!in_array(strtolower($content_block->tagName), array('div', 'article', 'section', 'header', 'footer'))) break;
				//$html = $content_block->firstChild->innerHTML; // FTR 2.9.5
				$content_block = $content_block->firstChild;
			}
			// convert content block to HTML string
			// Need to preserve things like body: //img[@id='feature']
			if (in_array(strtolower($content_block->tagName), array('div', 'article', 'section', 'header', 'footer'))) {
				$html = $content_block->innerHTML;
			} else {
				$html = $content_block->ownerDocument->saveXML($content_block); // essentially outerHTML
			}
			//unset($content_block);
			// post-processing cleanup
			$html = preg_replace('!<p>[\s\h\v]*</p>!u', '', $html);
			if ($links == 'remove') {
				$html = preg_replace('!</?a[^>]*>!', '', $html);
			}
			// get text sample for language detection
			$text_sample = strip_tags(substr($html, 0, 500));
			$html = make_substitutions($options->message_to_prepend).$html;
			$html .= make_substitutions($options->message_to_append);
		}
	}

	if ($valid_key && isset($_GET['pubsub'])) { // used only on fivefilters.org at the moment
		$newitem->addElement('guid', 'http://fivefilters.org/content-only/redirect.php?url='.urlencode($item->get_permalink()), array('isPermaLink'=>'false'));
	} else {
		$newitem->addElement('guid', $item->get_permalink(), array('isPermaLink'=>'true'));
	}
	// filter xss?
	if ($xss_filter) {
		debug('Filtering HTML to remove XSS');
		$html = htmLawed::hl($html, array('safe'=>1, 'deny_attribute'=>'style', 'comment'=>1, 'cdata'=>1));
	}

	// add content
	if ($options->summary === true) {
		// get summary
		$summary = '';
		if (!$do_content_extraction) {
			$summary = $html;
		} else {
			// Try to get first few paragraphs
			if (isset($content_block) && ($content_block instanceof DOMElement)) {
				$_paras = $content_block->getElementsByTagName('p');
				foreach ($_paras as $_para) {
					$summary .= preg_replace("/[\n\r\t ]+/", ' ', $_para->textContent).' ';
					if (strlen($summary) > 200) break;
				}
			} else {
				$summary = $html;
			}
		}
		unset($_paras, $_para);
		$summary = get_excerpt($summary);
		$newitem->setDescription($summary);
		if ($options->content) $newitem->setElement('content:encoded', $html);
	} else {
		if ($options->content) $newitem->setDescription($html);
	}

	// set date
	if ((int)$item->get_date('U') > 0) {
		$newitem->setDate((int)$item->get_date('U'));
	} elseif ($extractor->getDate()) {
		$newitem->setDate($extractor->getDate());
	}

	// add authors
	if ($authors = $item->get_authors()) {
		foreach ($authors as $author) {
			// for some feeds, SimplePie stores author's name as email, e.g. http://feeds.feedburner.com/nymag/intel
			if ($author->get_name() !== null) {
				$newitem->addElement('dc:creator', $author->get_name());
			} elseif ($author->get_email() !== null) {
				$newitem->addElement('dc:creator', $author->get_email());
			}
		}
	} elseif ($authors = $extractor->getAuthors()) {
		//TODO: make sure the list size is reasonable
		foreach ($authors as $author) {
			// TODO: xpath often selects authors from other articles linked from the page.
			// for now choose first item
			$newitem->addElement('dc:creator', $author);
			break;
		}
	}

	// add language
	if ($detect_language) {
		$language = $extractor->getLanguage();
		if (!$language) $language = $feed->get_language();
		if (($detect_language == 3 || (!$language && $detect_language == 2)) && $text_sample) {
			try {
				if ($use_cld) {
					// Use PHP-CLD extension
					$php_cld = 'CLD\detect'; // in quotes to prevent PHP 5.2 parse error
					$res = $php_cld($text_sample);
					if (is_array($res) && count($res) > 0) {
						$language = $res[0]['code'];
					}
				} else {
					//die('what');
					// Use PEAR's Text_LanguageDetect
					if (!isset($l))	{
					  $l = new Text_LanguageDetect();
					  $l->setNameMode(2); // return ISO 639-1 codes (e.g. "en")
					}
					$l_result = $l->detect($text_sample, 1);
					if (count($l_result) > 0) {
						$language = key($l_result);
					}
				}
			} catch (Exception $e) {
				//die('error: '.$e);
				// do nothing
			}
		}
		if ($language && (strlen($language) < 7)) {
			$newitem->addElement('dc:language', $language);
		}
	}

	// add MIME type (if it appeared in our exclusions lists)
	if (isset($mime_info['mime'])) $newitem->addElement('dc:format', $mime_info['mime']);
	// add effective URL (URL after redirects)
	if (isset($effective_url)) {
		//TODO: ensure $effective_url is valid witout - sometimes it causes problems, e.g.
		//http://www.siasat.pk/forum/showthread.php?108883-Pakistan-Chowk-by-Rana-Mubashir-�-25th-March-2012-Special-Program-from-Liari-(Karachi)
		//temporary measure: use utf8_encode()
		$newitem->addElement('dc:identifier', remove_url_cruft(utf8_encode($effective_url)));
	} else {
		$newitem->addElement('dc:identifier', remove_url_cruft($item->get_permalink()));
	}

	// add categories
	if ($categories = $item->get_categories()) {
		foreach ($categories as $category) {
			if ($category->get_label() !== null) {
				$newitem->addElement('category', $category->get_label());
			}
		}
	}

	// check for enclosures
	if ($options->keep_enclosures) {
		if ($enclosures = $item->get_enclosures()) {
			foreach ($enclosures as $enclosure) {
				// thumbnails
				foreach ((array)$enclosure->get_thumbnails() as $thumbnail) {
					$newitem->addElement('media:thumbnail', '', array('url'=>$thumbnail));
				}
				if (!$enclosure->get_link()) continue;
				$enc = array();
				// Media RSS spec ($enc): http://search.yahoo.com/mrss
				// SimplePie methods ($enclosure): http://simplepie.org/wiki/reference/start#methods4
				$enc['url'] = $enclosure->get_link();
				if ($enclosure->get_length()) $enc['fileSize'] = $enclosure->get_length();
				if ($enclosure->get_type()) $enc['type'] = $enclosure->get_type();
				if ($enclosure->get_medium()) $enc['medium'] = $enclosure->get_medium();
				if ($enclosure->get_expression()) $enc['expression'] = $enclosure->get_expression();
				if ($enclosure->get_bitrate()) $enc['bitrate'] = $enclosure->get_bitrate();
				if ($enclosure->get_framerate()) $enc['framerate'] = $enclosure->get_framerate();
				if ($enclosure->get_sampling_rate()) $enc['samplingrate'] = $enclosure->get_sampling_rate();
				if ($enclosure->get_channels()) $enc['channels'] = $enclosure->get_channels();
				if ($enclosure->get_duration()) $enc['duration'] = $enclosure->get_duration();
				if ($enclosure->get_height()) $enc['height'] = $enclosure->get_height();
				if ($enclosure->get_width()) $enc['width'] = $enclosure->get_width();
				if ($enclosure->get_language()) $enc['lang'] = $enclosure->get_language();
				$newitem->addElement('media:content', '', $enc);
			}
		}
	}
	$output->addItem($newitem);
	unset($html);
	$item_count++;
}

// output feed
debug('Done!');
/*
if ($debug_mode) {
	$_apc_data = apc_cache_info('user');
	var_dump($_apc_data); exit;
}
*/
if (!$debug_mode) {
	if ($callback) echo "$callback("; // if $callback is set, $format also == 'json'
	if ($format == 'json') $output->setFormat(($callback === null) ? JSON : JSONP);
	$add_to_cache = $options->caching;
	// is smart cache mode enabled?
	if ($add_to_cache && $options->apc && $options->smart_cache) {
		// yes, so only cache if this is the second request for this URL
		$add_to_cache = ($apc_cache_hits >= 2);
		// purge cache
		if ($options->cache_cleanup > 0) {
			if (rand(1, $options->cache_cleanup) == 1) {
				// apc purge code adapted from from http://www.thimbleopensource.com/tutorials-snippets/php-apc-expunge-script
				$_apc_data = apc_cache_info('user');
				foreach ($_apc_data['cache_list'] as $_apc_item) {
				  if ($_apc_item['ttl'] > 0 && ($_apc_item['ttl'] + $_apc_item['creation_time'] < time())) {
					apc_delete($_apc_item['info']);
				  }
				}
			}
		}
	}
	if ($add_to_cache) {
		ob_start();
		$output->genarateFeed(false);
		$output = ob_get_contents();
		ob_end_clean();
		if ($html_only && $item_count == 0) {
			// do not cache - in case of temporary server glitch at source URL
		} else {
			$cache = get_cache();
			if ($add_to_cache) $cache->save($output, $cache_id);
		}
		echo $output;
	} else {
		$output->genarateFeed(false);
	}
	if ($callback) echo ');';
}