summaryrefslogtreecommitdiff
path: root/includes/specials/SpecialBlock.php
blob: 3297c17a6b0632164067c8218aaa8b3b129caa72 (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
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
<?php
/**
 * Implements Special:Block
 *
 * 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
 * @ingroup SpecialPage
 */

/**
 * A special page that allows users with 'block' right to block users from
 * editing pages and other actions
 *
 * @ingroup SpecialPage
 */
class SpecialBlock extends FormSpecialPage {
	/** @var User User to be blocked, as passed either by parameter (url?wpTarget=Foo)
	 * or as subpage (Special:Block/Foo) */
	protected $target;

	/** @var int Block::TYPE_ constant */
	protected $type;

	/** @var User|string The previous block target */
	protected $previousTarget;

	/** @var bool Whether the previous submission of the form asked for HideUser */
	protected $requestedHideUser;

	/** @var bool */
	protected $alreadyBlocked;

	/** @var array */
	protected $preErrors = array();

	public function __construct() {
		parent::__construct( 'Block', 'block' );
	}

	/**
	 * Checks that the user can unblock themselves if they are trying to do so
	 *
	 * @param User $user
	 * @throws ErrorPageError
	 */
	protected function checkExecutePermissions( User $user ) {
		parent::checkExecutePermissions( $user );

		# bug 15810: blocked admins should have limited access here
		$status = self::checkUnblockSelf( $this->target, $user );
		if ( $status !== true ) {
			throw new ErrorPageError( 'badaccess', $status );
		}
	}

	/**
	 * Handle some magic here
	 *
	 * @param string $par
	 */
	protected function setParameter( $par ) {
		# Extract variables from the request.  Try not to get into a situation where we
		# need to extract *every* variable from the form just for processing here, but
		# there are legitimate uses for some variables
		$request = $this->getRequest();
		list( $this->target, $this->type ) = self::getTargetAndType( $par, $request );
		if ( $this->target instanceof User ) {
			# Set the 'relevant user' in the skin, so it displays links like Contributions,
			# User logs, UserRights, etc.
			$this->getSkin()->setRelevantUser( $this->target );
		}

		list( $this->previousTarget, /*...*/ ) =
			Block::parseTarget( $request->getVal( 'wpPreviousTarget' ) );
		$this->requestedHideUser = $request->getBool( 'wpHideUser' );
	}

	/**
	 * Customizes the HTMLForm a bit
	 *
	 * @param HTMLForm $form
	 */
	protected function alterForm( HTMLForm $form ) {
		$form->setWrapperLegendMsg( 'blockip-legend' );
		$form->setHeaderText( '' );
		$form->setSubmitCallback( array( __CLASS__, 'processUIForm' ) );

		$msg = $this->alreadyBlocked ? 'ipb-change-block' : 'ipbsubmit';
		$form->setSubmitTextMsg( $msg );

		# Don't need to do anything if the form has been posted
		if ( !$this->getRequest()->wasPosted() && $this->preErrors ) {
			$s = HTMLForm::formatErrors( $this->preErrors );
			if ( $s ) {
				$form->addHeaderText( Html::rawElement(
					'div',
					array( 'class' => 'error' ),
					$s
				) );
			}
		}
	}

	/**
	 * Get the HTMLForm descriptor array for the block form
	 * @return array
	 */
	protected function getFormFields() {
		global $wgBlockAllowsUTEdit;

		$user = $this->getUser();

		$suggestedDurations = self::getSuggestedDurations();

		$a = array(
			'Target' => array(
				'type' => 'text',
				'label-message' => 'ipaddressorusername',
				'id' => 'mw-bi-target',
				'size' => '45',
				'autofocus' => true,
				'required' => true,
				'validation-callback' => array( __CLASS__, 'validateTargetField' ),
			),
			'Expiry' => array(
				'type' => !count( $suggestedDurations ) ? 'text' : 'selectorother',
				'label-message' => 'ipbexpiry',
				'required' => true,
				'options' => $suggestedDurations,
				'other' => $this->msg( 'ipbother' )->text(),
				'default' => $this->msg( 'ipb-default-expiry' )->inContentLanguage()->text(),
			),
			'Reason' => array(
				'type' => 'selectandother',
				'label-message' => 'ipbreason',
				'options-message' => 'ipbreason-dropdown',
			),
			'CreateAccount' => array(
				'type' => 'check',
				'label-message' => 'ipbcreateaccount',
				'default' => true,
			),
		);

		if ( self::canBlockEmail( $user ) ) {
			$a['DisableEmail'] = array(
				'type' => 'check',
				'label-message' => 'ipbemailban',
			);
		}

		if ( $wgBlockAllowsUTEdit ) {
			$a['DisableUTEdit'] = array(
				'type' => 'check',
				'label-message' => 'ipb-disableusertalk',
				'default' => false,
			);
		}

		$a['AutoBlock'] = array(
			'type' => 'check',
			'label-message' => 'ipbenableautoblock',
			'default' => true,
		);

		# Allow some users to hide name from block log, blocklist and listusers
		if ( $user->isAllowed( 'hideuser' ) ) {
			$a['HideUser'] = array(
				'type' => 'check',
				'label-message' => 'ipbhidename',
				'cssclass' => 'mw-block-hideuser',
			);
		}

		# Watchlist their user page? (Only if user is logged in)
		if ( $user->isLoggedIn() ) {
			$a['Watch'] = array(
				'type' => 'check',
				'label-message' => 'ipbwatchuser',
			);
		}

		$a['HardBlock'] = array(
			'type' => 'check',
			'label-message' => 'ipb-hardblock',
			'default' => false,
		);

		# This is basically a copy of the Target field, but the user can't change it, so we
		# can see if the warnings we maybe showed to the user before still apply
		$a['PreviousTarget'] = array(
			'type' => 'hidden',
			'default' => false,
		);

		# We'll turn this into a checkbox if we need to
		$a['Confirm'] = array(
			'type' => 'hidden',
			'default' => '',
			'label-message' => 'ipb-confirm',
		);

		$this->maybeAlterFormDefaults( $a );

		// Allow extensions to add more fields
		wfRunHooks( 'SpecialBlockModifyFormFields', array( $this, &$a ) );

		return $a;
	}

	/**
	 * If the user has already been blocked with similar settings, load that block
	 * and change the defaults for the form fields to match the existing settings.
	 * @param array $fields HTMLForm descriptor array
	 * @return bool Whether fields were altered (that is, whether the target is
	 *     already blocked)
	 */
	protected function maybeAlterFormDefaults( &$fields ) {
		# This will be overwritten by request data
		$fields['Target']['default'] = (string)$this->target;

		# This won't be
		$fields['PreviousTarget']['default'] = (string)$this->target;

		$block = Block::newFromTarget( $this->target );

		if ( $block instanceof Block && !$block->mAuto # The block exists and isn't an autoblock
			&& ( $this->type != Block::TYPE_RANGE # The block isn't a rangeblock
				|| $block->getTarget() == $this->target ) # or if it is, the range is what we're about to block
		) {
			$fields['HardBlock']['default'] = $block->isHardblock();
			$fields['CreateAccount']['default'] = $block->prevents( 'createaccount' );
			$fields['AutoBlock']['default'] = $block->isAutoblocking();

			if ( isset( $fields['DisableEmail'] ) ) {
				$fields['DisableEmail']['default'] = $block->prevents( 'sendemail' );
			}

			if ( isset( $fields['HideUser'] ) ) {
				$fields['HideUser']['default'] = $block->mHideName;
			}

			if ( isset( $fields['DisableUTEdit'] ) ) {
				$fields['DisableUTEdit']['default'] = $block->prevents( 'editownusertalk' );
			}

			// If the username was hidden (ipb_deleted == 1), don't show the reason
			// unless this user also has rights to hideuser: Bug 35839
			if ( !$block->mHideName || $this->getUser()->isAllowed( 'hideuser' ) ) {
				$fields['Reason']['default'] = $block->mReason;
			} else {
				$fields['Reason']['default'] = '';
			}

			if ( $this->getRequest()->wasPosted() ) {
				# Ok, so we got a POST submission asking us to reblock a user.  So show the
				# confirm checkbox; the user will only see it if they haven't previously
				$fields['Confirm']['type'] = 'check';
			} else {
				# We got a target, but it wasn't a POST request, so the user must have gone
				# to a link like [[Special:Block/User]].  We don't need to show the checkbox
				# as long as they go ahead and block *that* user
				$fields['Confirm']['default'] = 1;
			}

			if ( $block->mExpiry == 'infinity' ) {
				$fields['Expiry']['default'] = 'infinite';
			} else {
				$fields['Expiry']['default'] = wfTimestamp( TS_RFC2822, $block->mExpiry );
			}

			$this->alreadyBlocked = true;
			$this->preErrors[] = array( 'ipb-needreblock', wfEscapeWikiText( (string)$block->getTarget() ) );
		}

		# We always need confirmation to do HideUser
		if ( $this->requestedHideUser ) {
			$fields['Confirm']['type'] = 'check';
			unset( $fields['Confirm']['default'] );
			$this->preErrors[] = array( 'ipb-confirmhideuser', 'ipb-confirmaction' );
		}

		# Or if the user is trying to block themselves
		if ( (string)$this->target === $this->getUser()->getName() ) {
			$fields['Confirm']['type'] = 'check';
			unset( $fields['Confirm']['default'] );
			$this->preErrors[] = array( 'ipb-blockingself', 'ipb-confirmaction' );
		}
	}

	/**
	 * Add header elements like block log entries, etc.
	 * @return string
	 */
	protected function preText() {
		$this->getOutput()->addModules( 'mediawiki.special.block' );

		$text = $this->msg( 'blockiptext' )->parse();

		$otherBlockMessages = array();
		if ( $this->target !== null ) {
			# Get other blocks, i.e. from GlobalBlocking or TorBlock extension
			wfRunHooks( 'OtherBlockLogLink', array( &$otherBlockMessages, $this->target ) );

			if ( count( $otherBlockMessages ) ) {
				$s = Html::rawElement(
					'h2',
					array(),
					$this->msg( 'ipb-otherblocks-header', count( $otherBlockMessages ) )->parse()
				) . "\n";

				$list = '';

				foreach ( $otherBlockMessages as $link ) {
					$list .= Html::rawElement( 'li', array(), $link ) . "\n";
				}

				$s .= Html::rawElement(
					'ul',
					array( 'class' => 'mw-blockip-alreadyblocked' ),
					$list
				) . "\n";

				$text .= $s;
			}
		}

		return $text;
	}

	/**
	 * Add footer elements to the form
	 * @return string
	 */
	protected function postText() {
		$links = array();

		# Link to the user's contributions, if applicable
		if ( $this->target instanceof User ) {
			$contribsPage = SpecialPage::getTitleFor( 'Contributions', $this->target->getName() );
			$links[] = Linker::link(
				$contribsPage,
				$this->msg( 'ipb-blocklist-contribs', $this->target->getName() )->escaped()
			);
		}

		# Link to unblock the specified user, or to a blank unblock form
		if ( $this->target instanceof User ) {
			$message = $this->msg(
				'ipb-unblock-addr',
				wfEscapeWikiText( $this->target->getName() )
			)->parse();
			$list = SpecialPage::getTitleFor( 'Unblock', $this->target->getName() );
		} else {
			$message = $this->msg( 'ipb-unblock' )->parse();
			$list = SpecialPage::getTitleFor( 'Unblock' );
		}
		$links[] = Linker::linkKnown( $list, $message, array() );

		# Link to the block list
		$links[] = Linker::linkKnown(
			SpecialPage::getTitleFor( 'BlockList' ),
			$this->msg( 'ipb-blocklist' )->escaped()
		);

		$user = $this->getUser();

		# Link to edit the block dropdown reasons, if applicable
		if ( $user->isAllowed( 'editinterface' ) ) {
			$links[] = Linker::link(
				Title::makeTitle( NS_MEDIAWIKI, 'Ipbreason-dropdown' ),
				$this->msg( 'ipb-edit-dropdown' )->escaped(),
				array(),
				array( 'action' => 'edit' )
			);
		}

		$text = Html::rawElement(
			'p',
			array( 'class' => 'mw-ipb-conveniencelinks' ),
			$this->getLanguage()->pipeList( $links )
		);

		$userTitle = self::getTargetUserTitle( $this->target );
		if ( $userTitle ) {
			# Get relevant extracts from the block and suppression logs, if possible
			$out = '';

			LogEventsList::showLogExtract(
				$out,
				'block',
				$userTitle,
				'',
				array(
					'lim' => 10,
					'msgKey' => array( 'blocklog-showlog', $userTitle->getText() ),
					'showIfEmpty' => false
				)
			);
			$text .= $out;

			# Add suppression block entries if allowed
			if ( $user->isAllowed( 'suppressionlog' ) ) {
				LogEventsList::showLogExtract(
					$out,
					'suppress',
					$userTitle,
					'',
					array(
						'lim' => 10,
						'conds' => array( 'log_action' => array( 'block', 'reblock', 'unblock' ) ),
						'msgKey' => array( 'blocklog-showsuppresslog', $userTitle->getText() ),
						'showIfEmpty' => false
					)
				);

				$text .= $out;
			}
		}

		return $text;
	}

	/**
	 * Get a user page target for things like logs.
	 * This handles account and IP range targets.
	 * @param User|string $target
	 * @return Title|null
	 */
	protected static function getTargetUserTitle( $target ) {
		if ( $target instanceof User ) {
			return $target->getUserPage();
		} elseif ( IP::isIPAddress( $target ) ) {
			return Title::makeTitleSafe( NS_USER, $target );
		}

		return null;
	}

	/**
	 * Determine the target of the block, and the type of target
	 * @todo Should be in Block.php?
	 * @param string $par Subpage parameter passed to setup, or data value from
	 *     the HTMLForm
	 * @param WebRequest $request Optionally try and get data from a request too
	 * @return array( User|string|null, Block::TYPE_ constant|null )
	 */
	public static function getTargetAndType( $par, WebRequest $request = null ) {
		$i = 0;
		$target = null;

		while ( true ) {
			switch ( $i++ ) {
				case 0:
					# The HTMLForm will check wpTarget first and only if it doesn't get
					# a value use the default, which will be generated from the options
					# below; so this has to have a higher precedence here than $par, or
					# we could end up with different values in $this->target and the HTMLForm!
					if ( $request instanceof WebRequest ) {
						$target = $request->getText( 'wpTarget', null );
					}
					break;
				case 1:
					$target = $par;
					break;
				case 2:
					if ( $request instanceof WebRequest ) {
						$target = $request->getText( 'ip', null );
					}
					break;
				case 3:
					# B/C @since 1.18
					if ( $request instanceof WebRequest ) {
						$target = $request->getText( 'wpBlockAddress', null );
					}
					break;
				case 4:
					break 2;
			}

			list( $target, $type ) = Block::parseTarget( $target );

			if ( $type !== null ) {
				return array( $target, $type );
			}
		}

		return array( null, null );
	}

	/**
	 * HTMLForm field validation-callback for Target field.
	 * @since 1.18
	 * @param string $value
	 * @param array $alldata
	 * @param HTMLForm $form
	 * @return Message
	 */
	public static function validateTargetField( $value, $alldata, $form ) {
		$status = self::validateTarget( $value, $form->getUser() );
		if ( !$status->isOK() ) {
			$errors = $status->getErrorsArray();

			return call_user_func_array( array( $form, 'msg' ), $errors[0] );
		} else {
			return true;
		}
	}

	/**
	 * Validate a block target.
	 *
	 * @since 1.21
	 * @param string $value Block target to check
	 * @param User $user Performer of the block
	 * @return Status
	 */
	public static function validateTarget( $value, User $user ) {
		global $wgBlockCIDRLimit;

		/** @var User $target */
		list( $target, $type ) = self::getTargetAndType( $value );
		$status = Status::newGood( $target );

		if ( $type == Block::TYPE_USER ) {
			if ( $target->isAnon() ) {
				$status->fatal(
					'nosuchusershort',
					wfEscapeWikiText( $target->getName() )
				);
			}

			$unblockStatus = self::checkUnblockSelf( $target, $user );
			if ( $unblockStatus !== true ) {
				$status->fatal( 'badaccess', $unblockStatus );
			}
		} elseif ( $type == Block::TYPE_RANGE ) {
			list( $ip, $range ) = explode( '/', $target, 2 );

			if (
				( IP::isIPv4( $ip ) && $wgBlockCIDRLimit['IPv4'] == 32 ) ||
				( IP::isIPv6( $ip ) && $wgBlockCIDRLimit['IPv6'] == 128 )
			) {
				// Range block effectively disabled
				$status->fatal( 'range_block_disabled' );
			}

			if (
				( IP::isIPv4( $ip ) && $range > 32 ) ||
				( IP::isIPv6( $ip ) && $range > 128 )
			) {
				// Dodgy range
				$status->fatal( 'ip_range_invalid' );
			}

			if ( IP::isIPv4( $ip ) && $range < $wgBlockCIDRLimit['IPv4'] ) {
				$status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv4'] );
			}

			if ( IP::isIPv6( $ip ) && $range < $wgBlockCIDRLimit['IPv6'] ) {
				$status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv6'] );
			}
		} elseif ( $type == Block::TYPE_IP ) {
			# All is well
		} else {
			$status->fatal( 'badipaddress' );
		}

		return $status;
	}

	/**
	 * Submit callback for an HTMLForm object, will simply pass
	 * @param array $data
	 * @param HTMLForm $form
	 * @return bool|string
	 */
	public static function processUIForm( array $data, HTMLForm $form ) {
		return self::processForm( $data, $form->getContext() );
	}

	/**
	 * Given the form data, actually implement a block
	 * @param array $data
	 * @param IContextSource $context
	 * @return bool|string
	 */
	public static function processForm( array $data, IContextSource $context ) {
		global $wgBlockAllowsUTEdit, $wgHideUserContribLimit, $wgContLang;

		$performer = $context->getUser();

		// Handled by field validator callback
		// self::validateTargetField( $data['Target'] );

		# This might have been a hidden field or a checkbox, so interesting data
		# can come from it
		$data['Confirm'] = !in_array( $data['Confirm'], array( '', '0', null, false ), true );

		/** @var User $target */
		list( $target, $type ) = self::getTargetAndType( $data['Target'] );
		if ( $type == Block::TYPE_USER ) {
			$user = $target;
			$target = $user->getName();
			$userId = $user->getId();

			# Give admins a heads-up before they go and block themselves.  Much messier
			# to do this for IPs, but it's pretty unlikely they'd ever get the 'block'
			# permission anyway, although the code does allow for it.
			# Note: Important to use $target instead of $data['Target']
			# since both $data['PreviousTarget'] and $target are normalized
			# but $data['target'] gets overriden by (non-normalized) request variable
			# from previous request.
			if ( $target === $performer->getName() &&
				( $data['PreviousTarget'] !== $target || !$data['Confirm'] )
			) {
				return array( 'ipb-blockingself', 'ipb-confirmaction' );
			}
		} elseif ( $type == Block::TYPE_RANGE ) {
			$userId = 0;
		} elseif ( $type == Block::TYPE_IP ) {
			$target = $target->getName();
			$userId = 0;
		} else {
			# This should have been caught in the form field validation
			return array( 'badipaddress' );
		}

		if ( ( strlen( $data['Expiry'] ) == 0 ) || ( strlen( $data['Expiry'] ) > 50 )
			|| !self::parseExpiryInput( $data['Expiry'] )
		) {
			return array( 'ipb_expiry_invalid' );
		}

		if ( !isset( $data['DisableEmail'] ) ) {
			$data['DisableEmail'] = false;
		}

		# If the user has done the form 'properly', they won't even have been given the
		# option to suppress-block unless they have the 'hideuser' permission
		if ( !isset( $data['HideUser'] ) ) {
			$data['HideUser'] = false;
		}

		if ( $data['HideUser'] ) {
			if ( !$performer->isAllowed( 'hideuser' ) ) {
				# this codepath is unreachable except by a malicious user spoofing forms,
				# or by race conditions (user has oversight and sysop, loads block form,
				# and is de-oversighted before submission); so need to fail completely
				# rather than just silently disable hiding
				return array( 'badaccess-group0' );
			}

			# Recheck params here...
			if ( $type != Block::TYPE_USER ) {
				$data['HideUser'] = false; # IP users should not be hidden
			} elseif ( !in_array( $data['Expiry'], array( 'infinite', 'infinity', 'indefinite' ) ) ) {
				# Bad expiry.
				return array( 'ipb_expiry_temp' );
			} elseif ( $wgHideUserContribLimit !== false
				&& $user->getEditCount() > $wgHideUserContribLimit
			) {
				# Typically, the user should have a handful of edits.
				# Disallow hiding users with many edits for performance.
				return array( array( 'ipb_hide_invalid',
					Message::numParam( $wgHideUserContribLimit ) ) );
			} elseif ( !$data['Confirm'] ) {
				return array( 'ipb-confirmhideuser', 'ipb-confirmaction' );
			}
		}

		# Create block object.
		$block = new Block();
		$block->setTarget( $target );
		$block->setBlocker( $performer );
		# Truncate reason for whole multibyte characters
		$block->mReason = $wgContLang->truncate( $data['Reason'][0], 255 );
		$block->mExpiry = self::parseExpiryInput( $data['Expiry'] );
		$block->prevents( 'createaccount', $data['CreateAccount'] );
		$block->prevents( 'editownusertalk', ( !$wgBlockAllowsUTEdit || $data['DisableUTEdit'] ) );
		$block->prevents( 'sendemail', $data['DisableEmail'] );
		$block->isHardblock( $data['HardBlock'] );
		$block->isAutoblocking( $data['AutoBlock'] );
		$block->mHideName = $data['HideUser'];

		$reason = array( 'hookaborted' );
		if ( !wfRunHooks( 'BlockIp', array( &$block, &$performer, &$reason ) ) ) {
			return $reason;
		}

		# Try to insert block. Is there a conflicting block?
		$status = $block->insert();
		if ( !$status ) {
			# Indicates whether the user is confirming the block and is aware of
			# the conflict (did not change the block target in the meantime)
			$blockNotConfirmed = !$data['Confirm'] || ( array_key_exists( 'PreviousTarget', $data )
				&& $data['PreviousTarget'] !== $target );

			# Special case for API - bug 32434
			$reblockNotAllowed = ( array_key_exists( 'Reblock', $data ) && !$data['Reblock'] );

			# Show form unless the user is already aware of this...
			if ( $blockNotConfirmed || $reblockNotAllowed ) {
				return array( array( 'ipb_already_blocked', $block->getTarget() ) );
				# Otherwise, try to update the block...
			} else {
				# This returns direct blocks before autoblocks/rangeblocks, since we should
				# be sure the user is blocked by now it should work for our purposes
				$currentBlock = Block::newFromTarget( $target );

				if ( $block->equals( $currentBlock ) ) {
					return array( array( 'ipb_already_blocked', $block->getTarget() ) );
				}

				# If the name was hidden and the blocking user cannot hide
				# names, then don't allow any block changes...
				if ( $currentBlock->mHideName && !$performer->isAllowed( 'hideuser' ) ) {
					return array( 'cant-see-hidden-user' );
				}

				$currentBlock->isHardblock( $block->isHardblock() );
				$currentBlock->prevents( 'createaccount', $block->prevents( 'createaccount' ) );
				$currentBlock->mExpiry = $block->mExpiry;
				$currentBlock->isAutoblocking( $block->isAutoblocking() );
				$currentBlock->mHideName = $block->mHideName;
				$currentBlock->prevents( 'sendemail', $block->prevents( 'sendemail' ) );
				$currentBlock->prevents( 'editownusertalk', $block->prevents( 'editownusertalk' ) );
				$currentBlock->mReason = $block->mReason;

				$status = $currentBlock->update();

				$logaction = 'reblock';

				# Unset _deleted fields if requested
				if ( $currentBlock->mHideName && !$data['HideUser'] ) {
					RevisionDeleteUser::unsuppressUserName( $target, $userId );
				}

				# If hiding/unhiding a name, this should go in the private logs
				if ( (bool)$currentBlock->mHideName ) {
					$data['HideUser'] = true;
				}
			}
		} else {
			$logaction = 'block';
		}

		wfRunHooks( 'BlockIpComplete', array( $block, $performer ) );

		# Set *_deleted fields if requested
		if ( $data['HideUser'] ) {
			RevisionDeleteUser::suppressUserName( $target, $userId );
		}

		# Can't watch a rangeblock
		if ( $type != Block::TYPE_RANGE && $data['Watch'] ) {
			WatchAction::doWatch(
				Title::makeTitle( NS_USER, $target ),
				$performer,
				WatchedItem::IGNORE_USER_RIGHTS
			);
		}

		# Block constructor sanitizes certain block options on insert
		$data['BlockEmail'] = $block->prevents( 'sendemail' );
		$data['AutoBlock'] = $block->isAutoblocking();

		# Prepare log parameters
		$logParams = array();
		$logParams[] = $data['Expiry'];
		$logParams[] = self::blockLogFlags( $data, $type );

		# Make log entry, if the name is hidden, put it in the oversight log
		$log_type = $data['HideUser'] ? 'suppress' : 'block';
		$log = new LogPage( $log_type );
		$log_id = $log->addEntry(
			$logaction,
			Title::makeTitle( NS_USER, $target ),
			$data['Reason'][0],
			$logParams,
			$performer
		);
		# Relate log ID to block IDs (bug 25763)
		$blockIds = array_merge( array( $status['id'] ), $status['autoIds'] );
		$log->addRelations( 'ipb_id', $blockIds, $log_id );

		# Report to the user
		return true;
	}

	/**
	 * Get an array of suggested block durations from MediaWiki:Ipboptions
	 * @todo FIXME: This uses a rather odd syntax for the options, should it be converted
	 *     to the standard "**<duration>|<displayname>" format?
	 * @param Language|null $lang The language to get the durations in, or null to use
	 *     the wiki's content language
	 * @return array
	 */
	public static function getSuggestedDurations( $lang = null ) {
		$a = array();
		$msg = $lang === null
			? wfMessage( 'ipboptions' )->inContentLanguage()->text()
			: wfMessage( 'ipboptions' )->inLanguage( $lang )->text();

		if ( $msg == '-' ) {
			return array();
		}

		foreach ( explode( ',', $msg ) as $option ) {
			if ( strpos( $option, ':' ) === false ) {
				$option = "$option:$option";
			}

			list( $show, $value ) = explode( ':', $option );
			$a[htmlspecialchars( $show )] = htmlspecialchars( $value );
		}

		return $a;
	}

	/**
	 * Convert a submitted expiry time, which may be relative ("2 weeks", etc) or absolute
	 * ("24 May 2034", etc), into an absolute timestamp we can put into the database.
	 * @param string $expiry Whatever was typed into the form
	 * @return string Timestamp or "infinity" string for the DB implementation
	 */
	public static function parseExpiryInput( $expiry ) {
		static $infinity;
		if ( $infinity == null ) {
			$infinity = wfGetDB( DB_SLAVE )->getInfinity();
		}

		if ( $expiry == 'infinite' || $expiry == 'indefinite' ) {
			$expiry = $infinity;
		} else {
			$expiry = strtotime( $expiry );

			if ( $expiry < 0 || $expiry === false ) {
				return false;
			}

			$expiry = wfTimestamp( TS_MW, $expiry );
		}

		return $expiry;
	}

	/**
	 * Can we do an email block?
	 * @param User $user The sysop wanting to make a block
	 * @return bool
	 */
	public static function canBlockEmail( $user ) {
		global $wgEnableUserEmail, $wgSysopEmailBans;

		return ( $wgEnableUserEmail && $wgSysopEmailBans && $user->isAllowed( 'blockemail' ) );
	}

	/**
	 * bug 15810: blocked admins should not be able to block/unblock
	 * others, and probably shouldn't be able to unblock themselves
	 * either.
	 * @param User|int|string $user
	 * @param User $performer User doing the request
	 * @return bool|string True or error message key
	 */
	public static function checkUnblockSelf( $user, User $performer ) {
		if ( is_int( $user ) ) {
			$user = User::newFromId( $user );
		} elseif ( is_string( $user ) ) {
			$user = User::newFromName( $user );
		}

		if ( $performer->isBlocked() ) {
			if ( $user instanceof User && $user->getId() == $performer->getId() ) {
				# User is trying to unblock themselves
				if ( $performer->isAllowed( 'unblockself' ) ) {
					return true;
					# User blocked themselves and is now trying to reverse it
				} elseif ( $performer->blockedBy() === $performer->getName() ) {
					return true;
				} else {
					return 'ipbnounblockself';
				}
			} else {
				# User is trying to block/unblock someone else
				return 'ipbblocked';
			}
		} else {
			return true;
		}
	}

	/**
	 * Return a comma-delimited list of "flags" to be passed to the log
	 * reader for this block, to provide more information in the logs
	 * @param array $data From HTMLForm data
	 * @param int $type Block::TYPE_ constant (USER, RANGE, or IP)
	 * @return string
	 */
	protected static function blockLogFlags( array $data, $type ) {
		global $wgBlockAllowsUTEdit;
		$flags = array();

		# when blocking a user the option 'anononly' is not available/has no effect
		# -> do not write this into log
		if ( !$data['HardBlock'] && $type != Block::TYPE_USER ) {
			// For grepping: message block-log-flags-anononly
			$flags[] = 'anononly';
		}

		if ( $data['CreateAccount'] ) {
			// For grepping: message block-log-flags-nocreate
			$flags[] = 'nocreate';
		}

		# Same as anononly, this is not displayed when blocking an IP address
		if ( !$data['AutoBlock'] && $type == Block::TYPE_USER ) {
			// For grepping: message block-log-flags-noautoblock
			$flags[] = 'noautoblock';
		}

		if ( $data['DisableEmail'] ) {
			// For grepping: message block-log-flags-noemail
			$flags[] = 'noemail';
		}

		if ( $wgBlockAllowsUTEdit && $data['DisableUTEdit'] ) {
			// For grepping: message block-log-flags-nousertalk
			$flags[] = 'nousertalk';
		}

		if ( $data['HideUser'] ) {
			// For grepping: message block-log-flags-hiddenname
			$flags[] = 'hiddenname';
		}

		return implode( ',', $flags );
	}

	/**
	 * Process the form on POST submission.
	 * @param array $data
	 * @return bool|array True for success, false for didn't-try, array of errors on failure
	 */
	public function onSubmit( array $data ) {
		// This isn't used since we need that HTMLForm that's passed in the
		// second parameter. See alterForm for the real function
	}

	/**
	 * Do something exciting on successful processing of the form, most likely to show a
	 * confirmation message
	 */
	public function onSuccess() {
		$out = $this->getOutput();
		$out->setPageTitle( $this->msg( 'blockipsuccesssub' ) );
		$out->addWikiMsg( 'blockipsuccesstext', wfEscapeWikiText( $this->target ) );
	}

	protected function getGroupName() {
		return 'users';
	}
}