-
Notifications
You must be signed in to change notification settings - Fork 16
/
timthumb.php
1271 lines (1159 loc) · 51.1 KB
/
timthumb.php
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
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<?php
/**
* 作者唯一QQ：858896214 （秋知德雨）
* QQ交流群：917367358
* 开发者不易，感谢支持，如果使用本主题尽量留个版权或者链接
*/
?>
<?php
/**
* TimThumb by Ben Gillbanks and Mark Maunder
* Based on work done by Tim McDaniels and Darren Hoyt
* http://code.google.com/p/timthumb/
*
* GNU General Public License, version 2
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* Examples and documentation available on the project homepage
* http://www.binarymoon.co.uk/projects/timthumb/
*
* $Rev$
*/
/*
* --- TimThumb CONFIGURATION ---
* To edit the configs it is best to create a file called timthumb-config.php
* and define variables you want to customize in there. It will automatically be
* loaded by timthumb. This will save you having to re-edit these variables
* everytime you download a new version
*/
require_once(dirname(__FILE__)."/../../../wp-load.php");
define ('VERSION', '2.8.14'); // Version of this script
//Load a config file if it exists. Otherwise, use the values below
if( file_exists(dirname(__FILE__) . '/timthumb-config.php')) require_once('timthumb-config.php');
if(! defined('DEBUG_ON') ) define ('DEBUG_ON', false); // Enable debug logging to web server error log (STDERR)
if(! defined('DEBUG_LEVEL') ) define ('DEBUG_LEVEL', 1); // Debug level 1 is less noisy and 3 is the most noisy
if(! defined('MEMORY_LIMIT') ) define ('MEMORY_LIMIT', '30M'); // Set PHP memory limit
if(! defined('BLOCK_EXTERNAL_LEECHERS') ) define ('BLOCK_EXTERNAL_LEECHERS', false); // If the image or webshot is being loaded on an external site, display a red "No Hotlinking" gif.
if(! defined('DISPLAY_ERROR_MESSAGES') ) define ('DISPLAY_ERROR_MESSAGES', true); // Display error messages. Set to false to turn off errors (good for production websites)
//Image fetching and caching
if(! defined('ALLOW_EXTERNAL') ) define ('ALLOW_EXTERNAL', _qzdy('rp-timthumb-wailian-switch')?TRUE:false); // Allow image fetching from external websites. Will check against ALLOWED_SITES if ALLOW_ALL_EXTERNAL_SITES is false
if(! defined('ALLOW_ALL_EXTERNAL_SITES') ) define ('ALLOW_ALL_EXTERNAL_SITES', false); // Less secure.
if(! defined('FILE_CACHE_ENABLED') ) define ('FILE_CACHE_ENABLED', TRUE); // Should we store resized/modified images on disk to speed things up?
if(! defined('FILE_CACHE_TIME_BETWEEN_CLEANS')) define ('FILE_CACHE_TIME_BETWEEN_CLEANS', 86400); // How often the cache is cleaned
if(! defined('FILE_CACHE_MAX_FILE_AGE') ) define ('FILE_CACHE_MAX_FILE_AGE', 86400); // How old does a file have to be to be deleted from the cache
if(! defined('FILE_CACHE_SUFFIX') ) define ('FILE_CACHE_SUFFIX', '.timthumb.txt'); // What to put at the end of all files in the cache directory so we can identify them
if(! defined('FILE_CACHE_PREFIX') ) define ('FILE_CACHE_PREFIX', 'timthumb'); // What to put at the beg of all files in the cache directory so we can identify them
if(! defined('FILE_CACHE_DIRECTORY') ) define ('FILE_CACHE_DIRECTORY', './cache'); // Directory where images are cached. Left blank it will use the system temporary directory (which is better for security)
if(! defined('MAX_FILE_SIZE') ) define ('MAX_FILE_SIZE', 20485760); // 10 Megs is 10485760. This is the max internal or external file size that we'll process.
if(! defined('CURL_TIMEOUT') ) define ('CURL_TIMEOUT', 20); // Timeout duration for Curl. This only applies if you have Curl installed and aren't using PHP's default URL fetching mechanism.
if(! defined('WAIT_BETWEEN_FETCH_ERRORS') ) define ('WAIT_BETWEEN_FETCH_ERRORS', 3600); // Time to wait between errors fetching remote file
//Browser caching
if(! defined('BROWSER_CACHE_MAX_AGE') ) define ('BROWSER_CACHE_MAX_AGE', 864000); // Time to cache in the browser
if(! defined('BROWSER_CACHE_DISABLE') ) define ('BROWSER_CACHE_DISABLE', false); // Use for testing if you want to disable all browser caching
//Image size and defaults
if(! defined('MAX_WIDTH') ) define ('MAX_WIDTH', 4000); // Maximum image width
if(! defined('MAX_HEIGHT') ) define ('MAX_HEIGHT', 4000); // Maximum image height
if(! defined('NOT_FOUND_IMAGE') ) define ('NOT_FOUND_IMAGE', ''); // Image to serve if any 404 occurs
if(! defined('ERROR_IMAGE') ) define ('ERROR_IMAGE', ''); // Image to serve if an error occurs instead of showing error message
if(! defined('PNG_IS_TRANSPARENT') ) define ('PNG_IS_TRANSPARENT', FALSE); // Define if a png image should have a transparent background color. Use False value if you want to display a custom coloured canvas_colour
if(! defined('DEFAULT_Q') ) define ('DEFAULT_Q', 100); // Default image quality. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_ZC') ) define ('DEFAULT_ZC', 1); // Default zoom/crop setting. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_F') ) define ('DEFAULT_F', ''); // Default image filters. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_S') ) define ('DEFAULT_S', 0); // Default sharpen value. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_CC') ) define ('DEFAULT_CC', 'ffffff'); // Default canvas colour. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_WIDTH') ) define ('DEFAULT_WIDTH', 100); // Default thumbnail width. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_HEIGHT') ) define ('DEFAULT_HEIGHT', 100); // Default thumbnail height. Allows overrid in timthumb-config.php
/**
* Additional Parameters:
* LOCAL_FILE_BASE_DIRECTORY = Override the DOCUMENT_ROOT. This is best used in timthumb-config.php
*/
//Image compression is enabled if either of these point to valid paths
//These are now disabled by default because the file sizes of PNGs (and GIFs) are much smaller than we used to generate.
//They only work for PNGs. GIFs and JPEGs are not affected.
if(! defined('OPTIPNG_ENABLED') ) define ('OPTIPNG_ENABLED', false);
if(! defined('OPTIPNG_PATH') ) define ('OPTIPNG_PATH', '/usr/bin/optipng'); //This will run first because it gives better compression than pngcrush.
if(! defined('PNGCRUSH_ENABLED') ) define ('PNGCRUSH_ENABLED', false);
if(! defined('PNGCRUSH_PATH') ) define ('PNGCRUSH_PATH', '/usr/bin/pngcrush'); //This will only run if OPTIPNG_PATH is not set or is not valid
/*
-------====Website Screenshots configuration - BETA====-------
If you just want image thumbnails and don't want website screenshots, you can safely leave this as is.
If you would like to get website screenshots set up, you will need root access to your own server.
Enable ALLOW_ALL_EXTERNAL_SITES so you can fetch any external web page. This is more secure now that we're using a non-web folder for cache.
Enable BLOCK_EXTERNAL_LEECHERS so that your site doesn't generate thumbnails for the whole Internet.
Instructions to get website screenshots enabled on Ubuntu Linux:
1. Install Xvfb with the following command: sudo apt-get install subversion libqt4-webkit libqt4-dev g++ xvfb
2. Go to a directory where you can download some code
3. Check-out the latest version of CutyCapt with the following command: svn co https://cutycapt.svn.sourceforge.net/svnroot/cutycapt
4. Compile CutyCapt by doing: cd cutycapt/CutyCapt
5. qmake
6. make
7. cp CutyCapt /usr/local/bin/
8. Test it by running: xvfb-run --server-args="-screen 0, 1024x768x24" CutyCapt --url="http://markmaunder.com/" --out=test.png
9. If you get a file called test.png with something in it, it probably worked. Now test the script by accessing it as follows:
10. http://yoursite.com/path/to/timthumb.php?src=http://markmaunder.com/&webshot=1
Notes on performance:
The first time a webshot loads, it will take a few seconds.
From then on it uses the regular timthumb caching mechanism with the configurable options above
and loading will be very fast.
--ADVANCED USERS ONLY--
If you'd like a slight speedup (about 25%) and you know Linux, you can run the following command which will keep Xvfb running in the background.
nohup Xvfb :100 -ac -nolisten tcp -screen 0, 1024x768x24 > /dev/null 2>&1 &
Then set WEBSHOT_XVFB_RUNNING = true below. This will save your server having to fire off a new Xvfb server and shut it down every time a new shot is generated.
You will need to take responsibility for keeping Xvfb running in case it crashes. (It seems pretty stable)
You will also need to take responsibility for server security if you're running Xvfb as root.
*/
if(! defined('WEBSHOT_ENABLED') ) define ('WEBSHOT_ENABLED', false); //Beta feature. Adding webshot=1 to your query string will cause the script to return a browser screenshot rather than try to fetch an image.
if(! defined('WEBSHOT_CUTYCAPT') ) define ('WEBSHOT_CUTYCAPT', '/usr/local/bin/CutyCapt'); //The path to CutyCapt.
if(! defined('WEBSHOT_XVFB') ) define ('WEBSHOT_XVFB', '/usr/bin/xvfb-run'); //The path to the Xvfb server
if(! defined('WEBSHOT_SCREEN_X') ) define ('WEBSHOT_SCREEN_X', '1024'); //1024 works ok
if(! defined('WEBSHOT_SCREEN_Y') ) define ('WEBSHOT_SCREEN_Y', '768'); //768 works ok
if(! defined('WEBSHOT_COLOR_DEPTH') ) define ('WEBSHOT_COLOR_DEPTH', '24'); //I haven't tested anything besides 24
if(! defined('WEBSHOT_IMAGE_FORMAT') ) define ('WEBSHOT_IMAGE_FORMAT', 'png'); //png is about 2.5 times the size of jpg but is a LOT better quality
if(! defined('WEBSHOT_TIMEOUT') ) define ('WEBSHOT_TIMEOUT', '20'); //Seconds to wait for a webshot
if(! defined('WEBSHOT_USER_AGENT') ) define ('WEBSHOT_USER_AGENT', "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.18) Gecko/20110614 Firefox/3.6.18"); //I hate to do this, but a non-browser robot user agent might not show what humans see. So we pretend to be Firefox
if(! defined('WEBSHOT_JAVASCRIPT_ON') ) define ('WEBSHOT_JAVASCRIPT_ON', true); //Setting to false might give you a slight speedup and block ads. But it could cause other issues.
if(! defined('WEBSHOT_JAVA_ON') ) define ('WEBSHOT_JAVA_ON', false); //Have only tested this as fase
if(! defined('WEBSHOT_PLUGINS_ON') ) define ('WEBSHOT_PLUGINS_ON', true); //Enable flash and other plugins
if(! defined('WEBSHOT_PROXY') ) define ('WEBSHOT_PROXY', ''); //In case you're behind a proxy server.
if(! defined('WEBSHOT_XVFB_RUNNING') ) define ('WEBSHOT_XVFB_RUNNING', false); //ADVANCED: Enable this if you've got Xvfb running in the background.
// If ALLOW_EXTERNAL is true and ALLOW_ALL_EXTERNAL_SITES is false, then external images will only be fetched from these domains and their subdomains.
if(! isset($ALLOWED_SITES)){
$ALLOWED_SITES = array (
);
if(!empty(_qzdy('rp-timthumb-bai'))){
$ALLOWED_SITES = explode(',', str_replace("，", ",", _qzdy('rp-timthumb-bai')));
}
}
// -------------------------------------------------------------
// -------------- STOP EDITING CONFIGURATION HERE --------------
// -------------------------------------------------------------
timthumb::start();
class timthumb {
protected $src = "";
protected $is404 = false;
protected $docRoot = "";
protected $lastURLError = false;
protected $localImage = "";
protected $localImageMTime = 0;
protected $url = false;
protected $myHost = "";
protected $isURL = false;
protected $cachefile = '';
protected $errors = array();
protected $toDeletes = array();
protected $cacheDirectory = '';
protected $startTime = 0;
protected $lastBenchTime = 0;
protected $cropTop = false;
protected $salt = "";
protected $fileCacheVersion = 1; //Generally if timthumb.php is modifed (upgraded) then the salt changes and all cache files are recreated. This is a backup mechanism to force regen.
protected $filePrependSecurityBlock = "<?php die('Execution denied!'); //"; //Designed to have three letter mime type, space, question mark and greater than symbol appended. 6 bytes total.
protected static $curlDataWritten = 0;
protected static $curlFH = false;
public static function start(){
$tim = new timthumb();
$tim->handleErrors();
$tim->securityChecks();
if($tim->tryBrowserCache()){
exit(0);
}
$tim->handleErrors();
if(FILE_CACHE_ENABLED && $tim->tryServerCache()){
exit(0);
}
$tim->handleErrors();
$tim->run();
$tim->handleErrors();
exit(0);
}
public function __construct(){
global $ALLOWED_SITES;
$this->startTime = microtime(true);
date_default_timezone_set('UTC');
$this->debug(1, "Starting new request from " . $this->getIP() . " to " . $_SERVER['REQUEST_URI']);
$this->calcDocRoot();
//On windows systems I'm assuming fileinode returns an empty string or a number that doesn't change. Check this.
$this->salt = @filemtime(__FILE__) . '-' . @fileinode(__FILE__);
$this->debug(3, "Salt is: " . $this->salt);
if(FILE_CACHE_DIRECTORY){
if(! is_dir(FILE_CACHE_DIRECTORY)){
@mkdir(FILE_CACHE_DIRECTORY);
if(! is_dir(FILE_CACHE_DIRECTORY)){
$this->error("Could not create the file cache directory.");
return false;
}
}
$this->cacheDirectory = FILE_CACHE_DIRECTORY;
if (!touch($this->cacheDirectory . '/index.html')) {
$this->error("Could not create the index.html file - to fix this create an empty file named index.html file in the cache directory.");
}
} else {
$this->cacheDirectory = sys_get_temp_dir();
}
//Clean the cache before we do anything because we don't want the first visitor after FILE_CACHE_TIME_BETWEEN_CLEANS expires to get a stale image.
$this->cleanCache();
$this->myHost = preg_replace('/^www\./i', '', $_SERVER['HTTP_HOST']);
$this->src = $this->param('src');
$this->url = parse_url($this->src);
$this->src = preg_replace('/https?:\/\/(?:www\.)?' . $this->myHost . '/i', '', $this->src);
if(strlen($this->src) <= 3){
$this->error("No image specified");
return false;
}
if(BLOCK_EXTERNAL_LEECHERS && array_key_exists('HTTP_REFERER', $_SERVER) && (! preg_match('/^https?:\/\/(?:www\.)?' . $this->myHost . '(?:$|\/)/i', $_SERVER['HTTP_REFERER']))){
// base64 encoded red image that says 'no hotlinkers'
// nothing to worry about! :)
$imgData = base64_decode("R0lGODlhUAAMAIAAAP8AAP///yH5BAAHAP8ALAAAAABQAAwAAAJpjI+py+0Po5y0OgAMjjv01YUZ\nOGplhWXfNa6JCLnWkXplrcBmW+spbwvaVr/cDyg7IoFC2KbYVC2NQ5MQ4ZNao9Ynzjl9ScNYpneb\nDULB3RP6JuPuaGfuuV4fumf8PuvqFyhYtjdoeFgAADs=");
header('Content-Type: image/gif');
header('Content-Length: ' . strlen($imgData));
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header("Pragma: no-cache");
header('Expires: ' . gmdate ('D, d M Y H:i:s', time()));
echo $imgData;
return false;
exit(0);
}
if(preg_match('/^https?:\/\/[^\/]+/i', $this->src)){
$this->debug(2, "Is a request for an external URL: " . $this->src);
$this->isURL = true;
} else {
$this->debug(2, "Is a request for an internal file: " . $this->src);
}
if($this->isURL && (! ALLOW_EXTERNAL)){
$this->error("You are not allowed to fetch images from an external website.");
return false;
}
if($this->isURL){
if(ALLOW_ALL_EXTERNAL_SITES){
$this->debug(2, "Fetching from all external sites is enabled.");
} else {
$this->debug(2, "Fetching only from selected external sites is enabled.");
$allowed = false;
foreach($ALLOWED_SITES as $site){
if ((strtolower(substr($this->url['host'],-strlen($site)-1)) === strtolower(".$site")) || (strtolower($this->url['host'])===strtolower($site))) {
$this->debug(3, "URL hostname {$this->url['host']} matches $site so allowing.");
$allowed = true;
}
}
if(! $allowed){
return $this->error("You may not fetch images from that site. To enable this site in timthumb, you can either add it to \$ALLOWED_SITES and set ALLOW_EXTERNAL=true. Or you can set ALLOW_ALL_EXTERNAL_SITES=true, depending on your security needs.");
}
}
}
$cachePrefix = ($this->isURL ? '_ext_' : '_int_');
if($this->isURL){
$arr = explode('&', $_SERVER ['QUERY_STRING']);
asort($arr);
$this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . implode('', $arr) . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
} else {
$this->localImage = $this->getLocalImagePath($this->src);
if(! $this->localImage){
$this->debug(1, "Could not find the local image: {$this->localImage}");
$this->error("Could not find the internal image you specified.");
$this->set404();
return false;
}
$this->debug(1, "Local image path is {$this->localImage}");
$this->localImageMTime = @filemtime($this->localImage);
//We include the mtime of the local file in case in changes on disk.
$this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . $this->localImageMTime . $_SERVER ['QUERY_STRING'] . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
}
$this->debug(2, "Cache file is: " . $this->cachefile);
return true;
}
public function __destruct(){
foreach($this->toDeletes as $del){
$this->debug(2, "Deleting temp file $del");
@unlink($del);
}
}
public function run(){
if($this->isURL){
if(! ALLOW_EXTERNAL){
$this->debug(1, "Got a request for an external image but ALLOW_EXTERNAL is disabled so returning error msg.");
$this->error("You are not allowed to fetch images from an external website.");
return false;
}
$this->debug(3, "Got request for external image. Starting serveExternalImage.");
if($this->param('webshot')){
if(WEBSHOT_ENABLED){
$this->debug(3, "webshot param is set, so we're going to take a webshot.");
$this->serveWebshot();
} else {
$this->error("You added the webshot parameter but webshots are disabled on this server. You need to set WEBSHOT_ENABLED == true to enable webshots.");
}
} else {
$this->debug(3, "webshot is NOT set so we're going to try to fetch a regular image.");
$this->serveExternalImage();
}
} else {
$this->debug(3, "Got request for internal image. Starting serveInternalImage()");
$this->serveInternalImage();
}
return true;
}
protected function handleErrors(){
if($this->haveErrors()){
if(NOT_FOUND_IMAGE && $this->is404()){
if($this->serveImg(NOT_FOUND_IMAGE)){
exit(0);
} else {
$this->error("Additionally, the 404 image that is configured could not be found or there was an error serving it.");
}
}
if(ERROR_IMAGE){
if($this->serveImg(ERROR_IMAGE)){
exit(0);
} else {
$this->error("Additionally, the error image that is configured could not be found or there was an error serving it.");
}
}
$this->serveErrors();
exit(0);
}
return false;
}
protected function tryBrowserCache(){
if(BROWSER_CACHE_DISABLE){ $this->debug(3, "Browser caching is disabled"); return false; }
if(!empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ){
$this->debug(3, "Got a conditional get");
$mtime = false;
//We've already checked if the real file exists in the constructor
if(! is_file($this->cachefile)){
//If we don't have something cached, regenerate the cached image.
return false;
}
if($this->localImageMTime){
$mtime = $this->localImageMTime;
$this->debug(3, "Local real file's modification time is $mtime");
} else if(is_file($this->cachefile)){ //If it's not a local request then use the mtime of the cached file to determine the 304
$mtime = @filemtime($this->cachefile);
$this->debug(3, "Cached file's modification time is $mtime");
}
if(! $mtime){ return false; }
$iftime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
$this->debug(3, "The conditional get's if-modified-since unixtime is $iftime");
if($iftime < 1){
$this->debug(3, "Got an invalid conditional get modified since time. Returning false.");
return false;
}
if($iftime < $mtime){ //Real file or cache file has been modified since last request, so force refetch.
$this->debug(3, "File has been modified since last fetch.");
return false;
} else { //Otherwise serve a 304
$this->debug(3, "File has not been modified since last get, so serving a 304.");
header ($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
$this->debug(1, "Returning 304 not modified");
return true;
}
}
return false;
}
protected function tryServerCache(){
$this->debug(3, "Trying server cache");
if(file_exists($this->cachefile)){
$this->debug(3, "Cachefile {$this->cachefile} exists");
if($this->isURL){
$this->debug(3, "This is an external request, so checking if the cachefile is empty which means the request failed previously.");
if(filesize($this->cachefile) < 1){
$this->debug(3, "Found an empty cachefile indicating a failed earlier request. Checking how old it is.");
//Fetching error occured previously
if(time() - @filemtime($this->cachefile) > WAIT_BETWEEN_FETCH_ERRORS){
$this->debug(3, "File is older than " . WAIT_BETWEEN_FETCH_ERRORS . " seconds. Deleting and returning false so app can try and load file.");
@unlink($this->cachefile);
return false; //to indicate we didn't serve from cache and app should try and load
} else {
$this->debug(3, "Empty cachefile is still fresh so returning message saying we had an error fetching this image from remote host.");
$this->set404();
$this->error("An error occured fetching image.");
return false;
}
}
} else {
$this->debug(3, "Trying to serve cachefile {$this->cachefile}");
}
if($this->serveCacheFile()){
$this->debug(3, "Succesfully served cachefile {$this->cachefile}");
return true;
} else {
$this->debug(3, "Failed to serve cachefile {$this->cachefile} - Deleting it from cache.");
//Image serving failed. We can't retry at this point, but lets remove it from cache so the next request recreates it
@unlink($this->cachefile);
return true;
}
}
}
protected function error($err){
$this->debug(3, "Adding error message: $err");
$this->errors[] = $err;
return false;
}
protected function haveErrors(){
if(sizeof($this->errors) > 0){
return true;
}
return false;
}
protected function serveErrors(){
header ($_SERVER['SERVER_PROTOCOL'] . ' 400 Bad Request');
if ( ! DISPLAY_ERROR_MESSAGES ) {
return;
}
$html = '<ul>';
foreach($this->errors as $err){
$html .= '<li>' . htmlentities($err) . '</li>';
}
$html .= '</ul>';
echo '<h1>A TimThumb error has occured</h1>The following error(s) occured:<br />' . $html . '<br />';
echo '<br />Query String : ' . htmlentities( $_SERVER['QUERY_STRING'], ENT_QUOTES );
echo '<br />TimThumb version : ' . VERSION . '</pre>';
}
protected function serveInternalImage(){
$this->debug(3, "Local image path is $this->localImage");
if(! $this->localImage){
$this->sanityFail("localImage not set after verifying it earlier in the code.");
return false;
}
$fileSize = filesize($this->localImage);
if($fileSize > MAX_FILE_SIZE){
$this->error("The file you specified is greater than the maximum allowed file size.");
return false;
}
if($fileSize <= 0){
$this->error("The file you specified is <= 0 bytes.");
return false;
}
$this->debug(3, "Calling processImageAndWriteToCache() for local image.");
if($this->processImageAndWriteToCache($this->localImage)){
$this->serveCacheFile();
return true;
} else {
return false;
}
}
protected function cleanCache(){
if (FILE_CACHE_TIME_BETWEEN_CLEANS < 0) {
return;
}
$this->debug(3, "cleanCache() called");
$lastCleanFile = $this->cacheDirectory . '/timthumb_cacheLastCleanTime.touch';
//If this is a new timthumb installation we need to create the file
if(! is_file($lastCleanFile)){
$this->debug(1, "File tracking last clean doesn't exist. Creating $lastCleanFile");
if (!touch($lastCleanFile)) {
$this->error("Could not create cache clean timestamp file.");
}
return;
}
if(@filemtime($lastCleanFile) < (time() - FILE_CACHE_TIME_BETWEEN_CLEANS) ){ //Cache was last cleaned more than 1 day ago
$this->debug(1, "Cache was last cleaned more than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago. Cleaning now.");
// Very slight race condition here, but worst case we'll have 2 or 3 servers cleaning the cache simultaneously once a day.
if (!touch($lastCleanFile)) {
$this->error("Could not create cache clean timestamp file.");
}
$files = glob($this->cacheDirectory . '/*' . FILE_CACHE_SUFFIX);
if ($files) {
$timeAgo = time() - FILE_CACHE_MAX_FILE_AGE;
foreach($files as $file){
if(@filemtime($file) < $timeAgo){
$this->debug(3, "Deleting cache file $file older than max age: " . FILE_CACHE_MAX_FILE_AGE . " seconds");
@unlink($file);
}
}
}
return true;
} else {
$this->debug(3, "Cache was cleaned less than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago so no cleaning needed.");
}
return false;
}
protected function processImageAndWriteToCache($localImage){
$sData = getimagesize($localImage);
$origType = $sData[2];
$mimeType = $sData['mime'];
$this->debug(3, "Mime type of image is $mimeType");
if(! preg_match('/^image\/(?:gif|jpg|jpeg|png)$/i', $mimeType)){
return $this->error("The image being resized is not a valid gif, jpg or png.");
}
if (!function_exists ('imagecreatetruecolor')) {
return $this->error('GD Library Error: imagecreatetruecolor does not exist - please contact your webhost and ask them to install the GD library');
}
if (function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
$imageFilters = array (
1 => array (IMG_FILTER_NEGATE, 0),
2 => array (IMG_FILTER_GRAYSCALE, 0),
3 => array (IMG_FILTER_BRIGHTNESS, 1),
4 => array (IMG_FILTER_CONTRAST, 1),
5 => array (IMG_FILTER_COLORIZE, 4),
6 => array (IMG_FILTER_EDGEDETECT, 0),
7 => array (IMG_FILTER_EMBOSS, 0),
8 => array (IMG_FILTER_GAUSSIAN_BLUR, 0),
9 => array (IMG_FILTER_SELECTIVE_BLUR, 0),
10 => array (IMG_FILTER_MEAN_REMOVAL, 0),
11 => array (IMG_FILTER_SMOOTH, 0),
);
}
// get standard input properties
$new_width = (int) abs ($this->param('w', 0));
$new_height = (int) abs ($this->param('h', 0));
$zoom_crop = (int) $this->param('zc', DEFAULT_ZC);
$quality = (int) abs ($this->param('q', DEFAULT_Q));
$align = $this->cropTop ? 't' : $this->param('a', 'c');
$filters = $this->param('f', DEFAULT_F);
$sharpen = (bool) $this->param('s', DEFAULT_S);
$canvas_color = $this->param('cc', DEFAULT_CC);
$canvas_trans = (bool) $this->param('ct', '1');
// set default width and height if neither are set already
if ($new_width == 0 && $new_height == 0) {
$new_width = (int) DEFAULT_WIDTH;
$new_height = (int) DEFAULT_HEIGHT;
}
// ensure size limits can not be abused
$new_width = min ($new_width, MAX_WIDTH);
$new_height = min ($new_height, MAX_HEIGHT);
// set memory limit to be able to have enough space to resize larger images
$this->setMemoryLimit();
// open the existing image
$image = $this->openImage ($mimeType, $localImage);
if ($image === false) {
return $this->error('Unable to open image.');
}
// Get original width and height
$width = imagesx ($image);
$height = imagesy ($image);
$origin_x = 0;
$origin_y = 0;
// generate new w/h if not provided
if ($new_width && !$new_height) {
$new_height = floor ($height * ($new_width / $width));
} else if ($new_height && !$new_width) {
$new_width = floor ($width * ($new_height / $height));
}
// scale down and add borders
if ($zoom_crop == 3) {
$final_height = $height * ($new_width / $width);
if ($final_height > $new_height) {
$new_width = $width * ($new_height / $height);
} else {
$new_height = $final_height;
}
}
// create a new true color image
$canvas = imagecreatetruecolor ($new_width, $new_height);
imagealphablending ($canvas, false);
if (strlen($canvas_color) == 3) { //if is 3-char notation, edit string into 6-char notation
$canvas_color = str_repeat(substr($canvas_color, 0, 1), 2) . str_repeat(substr($canvas_color, 1, 1), 2) . str_repeat(substr($canvas_color, 2, 1), 2);
} else if (strlen($canvas_color) != 6) {
$canvas_color = DEFAULT_CC; // on error return default canvas color
}
$canvas_color_R = hexdec (substr ($canvas_color, 0, 2));
$canvas_color_G = hexdec (substr ($canvas_color, 2, 2));
$canvas_color_B = hexdec (substr ($canvas_color, 4, 2));
// Create a new transparent color for image
// If is a png and PNG_IS_TRANSPARENT is false then remove the alpha transparency
// (and if is set a canvas color show it in the background)
if(preg_match('/^image\/png$/i', $mimeType) && !PNG_IS_TRANSPARENT && $canvas_trans){
$color = imagecolorallocatealpha ($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 127);
}else{
$color = imagecolorallocatealpha ($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 0);
}
// Completely fill the background of the new image with allocated color.
imagefill ($canvas, 0, 0, $color);
// scale down and add borders
if ($zoom_crop == 2) {
$final_height = $height * ($new_width / $width);
if ($final_height > $new_height) {
$origin_x = $new_width / 2;
$new_width = $width * ($new_height / $height);
$origin_x = round ($origin_x - ($new_width / 2));
} else {
$origin_y = $new_height / 2;
$new_height = $final_height;
$origin_y = round ($origin_y - ($new_height / 2));
}
}
// Restore transparency blending
imagesavealpha ($canvas, true);
if ($zoom_crop > 0) {
$src_x = $src_y = 0;
$src_w = $width;
$src_h = $height;
$cmp_x = $width / $new_width;
$cmp_y = $height / $new_height;
// calculate x or y coordinate and width or height of source
if ($cmp_x > $cmp_y) {
$src_w = round ($width / $cmp_x * $cmp_y);
$src_x = round (($width - ($width / $cmp_x * $cmp_y)) / 2);
} else if ($cmp_y > $cmp_x) {
$src_h = round ($height / $cmp_y * $cmp_x);
$src_y = round (($height - ($height / $cmp_y * $cmp_x)) / 2);
}
// positional cropping!
if ($align) {
if (strpos ($align, 't') !== false) {
$src_y = 0;
}
if (strpos ($align, 'b') !== false) {
$src_y = $height - $src_h;
}
if (strpos ($align, 'l') !== false) {
$src_x = 0;
}
if (strpos ($align, 'r') !== false) {
$src_x = $width - $src_w;
}
}
imagecopyresampled ($canvas, $image, $origin_x, $origin_y, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h);
} else {
// copy and resize part of an image with resampling
imagecopyresampled ($canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
}
if ($filters != '' && function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
// apply filters to image
$filterList = explode ('|', $filters);
foreach ($filterList as $fl) {
$filterSettings = explode (',', $fl);
if (isset ($imageFilters[$filterSettings[0]])) {
for ($i = 0; $i < 4; $i ++) {
if (!isset ($filterSettings[$i])) {
$filterSettings[$i] = null;
} else {
$filterSettings[$i] = (int) $filterSettings[$i];
}
}
switch ($imageFilters[$filterSettings[0]][1]) {
case 1:
imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1]);
break;
case 2:
imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2]);
break;
case 3:
imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3]);
break;
case 4:
imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3], $filterSettings[4]);
break;
default:
imagefilter ($canvas, $imageFilters[$filterSettings[0]][0]);
break;
}
}
}
}
// sharpen image
if ($sharpen && function_exists ('imageconvolution')) {
$sharpenMatrix = array (
array (-1,-1,-1),
array (-1,16,-1),
array (-1,-1,-1),
);
$divisor = 8;
$offset = 0;
imageconvolution ($canvas, $sharpenMatrix, $divisor, $offset);
}
//Straight from Wordpress core code. Reduces filesize by up to 70% for PNG's
if ( (IMAGETYPE_PNG == $origType || IMAGETYPE_GIF == $origType) && function_exists('imageistruecolor') && !imageistruecolor( $image ) && imagecolortransparent( $image ) > 0 ){
imagetruecolortopalette( $canvas, false, imagecolorstotal( $image ) );
}
$imgType = "";
$tempfile = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
if(preg_match('/^image\/(?:jpg|jpeg)$/i', $mimeType)){
$imgType = 'jpg';
imagejpeg($canvas, $tempfile, $quality);
} else if(preg_match('/^image\/png$/i', $mimeType)){
$imgType = 'png';
imagepng($canvas, $tempfile, floor($quality * 0.09));
} else if(preg_match('/^image\/gif$/i', $mimeType)){
$imgType = 'gif';
imagegif($canvas, $tempfile);
} else {
return $this->sanityFail("Could not match mime type after verifying it previously.");
}
if($imgType == 'png' && OPTIPNG_ENABLED && OPTIPNG_PATH && @is_file(OPTIPNG_PATH)){
$exec = OPTIPNG_PATH;
$this->debug(3, "optipng'ing $tempfile");
$presize = filesize($tempfile);
$out = `$exec -o1 $tempfile`; //you can use up to -o7 but it really slows things down
clearstatcache();
$aftersize = filesize($tempfile);
$sizeDrop = $presize - $aftersize;
if($sizeDrop > 0){
$this->debug(1, "optipng reduced size by $sizeDrop");
} else if($sizeDrop < 0){
$this->debug(1, "optipng increased size! Difference was: $sizeDrop");
} else {
$this->debug(1, "optipng did not change image size.");
}
} else if($imgType == 'png' && PNGCRUSH_ENABLED && PNGCRUSH_PATH && @is_file(PNGCRUSH_PATH)){
$exec = PNGCRUSH_PATH;
$tempfile2 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
$this->debug(3, "pngcrush'ing $tempfile to $tempfile2");
$out = `$exec $tempfile $tempfile2`;
$todel = "";
if(is_file($tempfile2)){
$sizeDrop = filesize($tempfile) - filesize($tempfile2);
if($sizeDrop > 0){
$this->debug(1, "pngcrush was succesful and gave a $sizeDrop byte size reduction");
$todel = $tempfile;
$tempfile = $tempfile2;
} else {
$this->debug(1, "pngcrush did not reduce file size. Difference was $sizeDrop bytes.");
$todel = $tempfile2;
}
} else {
$this->debug(3, "pngcrush failed with output: $out");
$todel = $tempfile2;
}
@unlink($todel);
}
$this->debug(3, "Rewriting image with security header.");
$tempfile4 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
$context = stream_context_create ();
$fp = fopen($tempfile,'r',0,$context);
file_put_contents($tempfile4, $this->filePrependSecurityBlock . $imgType . ' ?' . '>'); //6 extra bytes, first 3 being image type
file_put_contents($tempfile4, $fp, FILE_APPEND);
fclose($fp);
@unlink($tempfile);
$this->debug(3, "Locking and replacing cache file.");
$lockFile = $this->cachefile . '.lock';
$fh = fopen($lockFile, 'w');
if(! $fh){
return $this->error("Could not open the lockfile for writing an image.");
}
if(flock($fh, LOCK_EX)){
@unlink($this->cachefile); //rename generally overwrites, but doing this in case of platform specific quirks. File might not exist yet.
rename($tempfile4, $this->cachefile);
flock($fh, LOCK_UN);
fclose($fh);
@unlink($lockFile);
} else {
fclose($fh);
@unlink($lockFile);
@unlink($tempfile4);
return $this->error("Could not get a lock for writing.");
}
$this->debug(3, "Done image replace with security header. Cleaning up and running cleanCache()");
imagedestroy($canvas);
imagedestroy($image);
return true;
}
protected function calcDocRoot(){
$docRoot = @$_SERVER['DOCUMENT_ROOT'];
if (defined('LOCAL_FILE_BASE_DIRECTORY')) {
$docRoot = LOCAL_FILE_BASE_DIRECTORY;
}
if(!isset($docRoot)){
$this->debug(3, "DOCUMENT_ROOT is not set. This is probably windows. Starting search 1.");
if(isset($_SERVER['SCRIPT_FILENAME'])){
$docRoot = str_replace( '\\', '/', substr($_SERVER['SCRIPT_FILENAME'], 0, 0-strlen($_SERVER['PHP_SELF'])));
$this->debug(3, "Generated docRoot using SCRIPT_FILENAME and PHP_SELF as: $docRoot");
}
}
if(!isset($docRoot)){
$this->debug(3, "DOCUMENT_ROOT still is not set. Starting search 2.");
if(isset($_SERVER['PATH_TRANSLATED'])){
$docRoot = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0-strlen($_SERVER['PHP_SELF'])));
$this->debug(3, "Generated docRoot using PATH_TRANSLATED and PHP_SELF as: $docRoot");
}
}
if($docRoot && $_SERVER['DOCUMENT_ROOT'] != '/'){ $docRoot = preg_replace('/\/$/', '', $docRoot); }
$this->debug(3, "Doc root is: " . $docRoot);
$this->docRoot = $docRoot;
}
protected function getLocalImagePath($src){
$src = ltrim($src, '/'); //strip off the leading '/'
if(! $this->docRoot){
$this->debug(3, "We have no document root set, so as a last resort, lets check if the image is in the current dir and serve that.");
//We don't support serving images outside the current dir if we don't have a doc root for security reasons.
$file = preg_replace('/^.*?([^\/\\\\]+)$/', '$1', $src); //strip off any path info and just leave the filename.
if(is_file($file)){
return $this->realpath($file);
}
return $this->error("Could not find your website document root and the file specified doesn't exist in timthumbs directory. We don't support serving files outside timthumb's directory without a document root for security reasons.");
} else if ( ! is_dir( $this->docRoot ) ) {
$this->error("Server path does not exist. Ensure variable \$_SERVER['DOCUMENT_ROOT'] is set correctly");
}
//Do not go past this point without docRoot set
//Try src under docRoot
if(file_exists ($this->docRoot . '/' . $src)) {
$this->debug(3, "Found file as " . $this->docRoot . '/' . $src);
$real = $this->realpath($this->docRoot . '/' . $src);
if(stripos($real, $this->docRoot) === 0){
return $real;
} else {
$this->debug(1, "Security block: The file specified occurs outside the document root.");
//allow search to continue
}
}
//Check absolute paths and then verify the real path is under doc root
$absolute = $this->realpath('/' . $src);
if($absolute && file_exists($absolute)){ //realpath does file_exists check, so can probably skip the exists check here
$this->debug(3, "Found absolute path: $absolute");
if(! $this->docRoot){ $this->sanityFail("docRoot not set when checking absolute path."); }
if(stripos($absolute, $this->docRoot) === 0){
return $absolute;
} else {
$this->debug(1, "Security block: The file specified occurs outside the document root.");
//and continue search
}
}
$base = $this->docRoot;
// account for Windows directory structure
if (strstr($_SERVER['SCRIPT_FILENAME'],':')) {
$sub_directories = explode('\\', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
} else {
$sub_directories = explode('/', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
}
foreach ($sub_directories as $sub){
$base .= $sub . '/';
$this->debug(3, "Trying file as: " . $base . $src);
if(file_exists($base . $src)){
$this->debug(3, "Found file as: " . $base . $src);
$real = $this->realpath($base . $src);
if(stripos($real, $this->realpath($this->docRoot)) === 0){
return $real;
} else {
$this->debug(1, "Security block: The file specified occurs outside the document root.");
//And continue search
}
}
}
return false;
}
protected function realpath($path){
//try to remove any relative paths
$remove_relatives = '/\w+\/\.\.\//';
while(preg_match($remove_relatives,$path)){
$path = preg_replace($remove_relatives, '', $path);
}
//if any remain use PHP realpath to strip them out, otherwise return $path
//if using realpath, any symlinks will also be resolved
return preg_match('#^\.\./|/\.\./#', $path) ? realpath($path) : $path;
}
protected function toDelete($name){
$this->debug(3, "Scheduling file $name to delete on destruct.");
$this->toDeletes[] = $name;
}
protected function serveWebshot(){
$this->debug(3, "Starting serveWebshot");
$instr = "Please follow the instructions at http://code.google.com/p/timthumb/ to set your server up for taking website screenshots.";
if(! is_file(WEBSHOT_CUTYCAPT)){
return $this->error("CutyCapt is not installed. $instr");
}
if(! is_file(WEBSHOT_XVFB)){
return $this->Error("Xvfb is not installed. $instr");
}
$cuty = WEBSHOT_CUTYCAPT;
$xv = WEBSHOT_XVFB;
$screenX = WEBSHOT_SCREEN_X;
$screenY = WEBSHOT_SCREEN_Y;
$colDepth = WEBSHOT_COLOR_DEPTH;
$format = WEBSHOT_IMAGE_FORMAT;
$timeout = WEBSHOT_TIMEOUT * 1000;
$ua = WEBSHOT_USER_AGENT;
$jsOn = WEBSHOT_JAVASCRIPT_ON ? 'on' : 'off';
$javaOn = WEBSHOT_JAVA_ON ? 'on' : 'off';
$pluginsOn = WEBSHOT_PLUGINS_ON ? 'on' : 'off';
$proxy = WEBSHOT_PROXY ? ' --http-proxy=' . WEBSHOT_PROXY : '';
$tempfile = tempnam($this->cacheDirectory, 'timthumb_webshot');
$url = $this->src;
if(! preg_match('/^https?:\/\/[a-zA-Z0-9\.\-]+/i', $url)){
return $this->error("Invalid URL supplied.");
}
$url = preg_replace('/[^A-Za-z0-9\-\.\_:\/\?\&\+\;\=]+/', '', $url); //RFC 3986 plus ()$ chars to prevent exploit below. Plus the following are also removed: @*!~#[]',
// 2014 update by Mark Maunder: This exploit: http://cxsecurity.com/issue/WLB-2014060134
// uses the $(command) shell execution syntax to execute arbitrary shell commands as the web server user.
// So we're now filtering out the characters: '$', '(' and ')' in the above regex to avoid this.
// We are also filtering out chars rarely used in URLs but legal accoring to the URL RFC which might be exploitable. These include: @*!~#[]',
// We're doing this because we're passing this URL to the shell and need to make very sure it's not going to execute arbitrary commands.
if(WEBSHOT_XVFB_RUNNING){
putenv('DISPLAY=:100.0');
$command = "$cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
} else {
$command = "$xv --server-args=\"-screen 0, {$screenX}x{$screenY}x{$colDepth}\" $cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
}
$this->debug(3, "Executing command: $command");
$out = `$command`;
$this->debug(3, "Received output: $out");
if(! is_file($tempfile)){
$this->set404();
return $this->error("The command to create a thumbnail failed.");
}
$this->cropTop = true;
if($this->processImageAndWriteToCache($tempfile)){
$this->debug(3, "Image processed succesfully. Serving from cache");
return $this->serveCacheFile();
} else {
return false;
}
}
protected function serveExternalImage(){
if(! preg_match('/^https?:\/\/[a-zA-Z0-9\-\.]+/i', $this->src)){
$this->error("Invalid URL supplied.");
return false;
}
$tempfile = tempnam($this->cacheDirectory, 'timthumb');
$this->debug(3, "Fetching external image into temporary file $tempfile");
$this->toDelete($tempfile);