aboutsummaryrefslogtreecommitdiffstats
path: root/Zotlabs/Module/Wiki.php
blob: b5801c3d77883223c67b63533a25f4653cff984d (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
<?php /** @file */

namespace Zotlabs\Module;

use \Zotlabs\Lib as Zlib;
use \Michelf\MarkdownExtra;

require_once('include/acl_selectors.php');
require_once('include/conversation.php');
require_once('include/bbcode.php');


class Wiki extends \Zotlabs\Web\Controller {

	private $wiki = null;

	function init() {
		// Determine which channel's wikis to display to the observer
		$nick = null;
		if (argc() > 1)
			$nick = argv(1); // if the channel name is in the URL, use that
		if (! $nick && local_channel()) { // if no channel name was provided, assume the current logged in channel
			$channel = \App::get_channel();
			if ($channel && $channel['channel_address']) {
				$nick = $channel['channel_address'];
				goaway(z_root() . '/wiki/' . $nick);
			}
		}
		if (! $nick) {
			notice( t('Profile Unavailable.') . EOL);
			goaway(z_root());
		}

		profile_load($nick);
	}

	function get() {

		if(observer_prohibited(true)) {
			return login();
		}

		if(! feature_enabled(\App::$profile_uid,'wiki')) {
			notice( t('Not found') . EOL);
     		return;
 		}


		if(! perm_is_allowed(\App::$profile_uid,get_observer_hash(),'view_wiki')) {
			notice( t('Permission denied.') . EOL);
			return;
		}

		// TODO: Combine the interface configuration into a unified object
		// Something like $interface = array('new_page_button' => false, 'new_wiki_button' => false, ...)

		$wiki_owner = false;
		$showNewWikiButton = false;
		$pageHistory = array();
		$local_observer = null;
		$resource_id = '';
		
		// init() should have forced the URL to redirect to /wiki/channel so assume argc() > 1

		$nick = argv(1);
		$owner = channelx_by_nick($nick);  // The channel who owns the wikis being viewed
		if(! $owner) {
			notice( t('Invalid channel') . EOL);
			goaway('/' . argv(0));
		}

		$observer_hash = get_observer_hash();

		// Determine if the observer is the channel owner so the ACL dialog can be populated
		if (local_channel() === intval($owner['channel_id'])) {

			$wiki_owner = true;

			// Obtain the default permission settings of the channel
			$owner_acl = array(
				'allow_cid' => $owner['channel_allow_cid'],
				'allow_gid' => $owner['channel_allow_gid'],
				'deny_cid' => $owner['channel_deny_cid'],
				'deny_gid' => $owner['channel_deny_gid']
			);

			// Initialize the ACL to the channel default permissions

			$x = array(
					'lockstate' => (( $owner['channel_allow_cid'] || 
						$owner['channel_allow_gid'] || 
						$owner['channel_deny_cid'] || 
						$owner['channel_deny_gid'])
						? 'lock' : 'unlock'
					),
					'acl' => populate_acl($owner_acl),
					'allow_cid' => acl2json($owner_acl['allow_cid']),
					'allow_gid' => acl2json($owner_acl['allow_gid']),
					'deny_cid'  => acl2json($owner_acl['deny_cid']),
					'deny_gid'  => acl2json($owner_acl['deny_gid']),
					'bang' => ''
			);
		}
		else {
			// Not the channel owner 
			$owner_acl = $x = array();
		}

		$is_owner = ((local_channel()) && (local_channel() == \App::$profile['profile_uid']) ? true : false);
		$o = profile_tabs($a, $is_owner, \App::$profile['channel_address']);

		// Download a wiki
/*
		if((argc() > 3) && (argv(2) === 'download') && (argv(3) === 'wiki')) {

			$resource_id = argv(4);

			$w = Zlib\NativeWiki::get_wiki($owner,$observer_hash,$resource_id);
			if(! $w['htmlName']) {
				notice(t('Error retrieving wiki') . EOL);
			}

			$zip_folder_name = random_string(10);
			$zip_folderpath = '/tmp/' . $zip_folder_name;
			if(!mkdir($zip_folderpath, 0770, false)) {
				logger('Error creating zip file export folder: ' . $zip_folderpath, LOGGER_NORMAL);
				notice(t('Error creating zip file export folder') . EOL);
			}

			$zip_filename = $w['urlName'];
			$zip_filepath = '/tmp/' . $zip_folder_name . '/' . $zip_filename;

			// Generate the zip file
			ZLib\ExtendedZip::zipTree($w['path'], $zip_filepath, \ZipArchive::CREATE);

			// Output the file for download

			header('Content-disposition: attachment; filename="' . $zip_filename . '.zip"');
			header('Content-Type: application/zip');

			$success = readfile($zip_filepath);

			if(!$success) {
				logger('Error downloading wiki: ' . $resource_id);
				notice(t('Error downloading wiki: ' . $resource_id) . EOL);
			}

			// delete temporary files
			rrmdir($zip_folderpath);
			killme();

		}
*/
		switch(argc()) {
			case 2:
				$wikis = Zlib\NativeWiki::listwikis($owner, get_observer_hash());
				if($wikis) {
					$o .= replace_macros(get_markup_template('wikilist.tpl'), array(
						'$header' => t('Wikis'),
						'$channel' => $owner['channel_address'],
						'$wikis' => $wikis['wikis'],
						// If the observer is the local channel owner, show the wiki controls
						'$owner' => ((local_channel() && local_channel() === intval(\App::$profile['uid'])) ? true : false),
						'$edit' => t('Edit'),
						'$download' => t('Download'),
						'$view' => t('View'),
						'$create' => t('Create New'),
						'$submit' => t('Submit'),
						'$wikiName' => array('wikiName', t('Wiki name')),
						'$mimeType' => array('mimeType', t('Content type'), '', '', ['text/markdown' => 'Markdown', 'text/bbcode' => 'BB Code']),
						'$name' => t('Name'),
						'$type' => t('Type'),
						'$lockstate' => $x['lockstate'],
						'$acl' => $x['acl'],
						'$allow_cid' => $x['allow_cid'],
						'$allow_gid' => $x['allow_gid'],
						'$deny_cid' => $x['deny_cid'],
						'$deny_gid' => $x['deny_gid'],
						'$notify' => array('postVisible', t('Create a status post for this wiki'), '', '', array(t('No'), t('Yes')))
					));

					return $o;
				}
				break;

			case 3:

				// /wiki/channel/wiki -> No page was specified, so redirect to Home.md

				$wikiUrlName = urlencode(argv(2));
				goaway(z_root() . '/' . argv(0) . '/' . argv(1) . '/' . $wikiUrlName . '/Home');

			case 4:

				// GET /wiki/channel/wiki/page
				// Fetch the wiki info and determine observer permissions

				$wikiUrlName = urldecode(argv(2));
				$pageUrlName = urldecode(argv(3));

				$w = Zlib\NativeWiki::exists_by_name($owner['channel_id'], $wikiUrlName);

				if(! $w['resource_id']) {
					notice(t('Wiki not found') . EOL);
					goaway(z_root() . '/' . argv(0) . '/' . argv(1));
				}				

				$resource_id = $w['resource_id'];
				
				if(! $wiki_owner) {
					// Check for observer permissions
					$observer_hash = get_observer_hash();
					$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
					if(! $perms['read']) {
						notice(t('Permission denied.') . EOL);
						goaway(z_root() . '/' . argv(0) . '/' . argv(1));
						return; //not reached
					}
					$wiki_editor = (($perms['write']) ? true : false);
				}
				else {
					$wiki_editor = true;
				}

				$wikiheaderName = urldecode($wikiUrlName);
				$wikiheaderPage = urldecode($pageUrlName);

				$renamePage = (($wikiheaderPage === 'Home') ? '' : t('Rename page'));

				$p = Zlib\NativeWikiPage::get_page_content(array('channel_id' => $owner['channel_id'], 'observer_hash' => $observer_hash, 'resource_id' => $resource_id, 'pageUrlName' => $pageUrlName));
				if(! $p['success']) {
					notice( t('Error retrieving page content') . EOL);
					goaway(z_root() . '/' . argv(0) . '/' . argv(1) );
				}

				$mimeType = $p['mimeType'];

				$rawContent = htmlspecialchars_decode(json_decode($p['content']),ENT_COMPAT);

				$rawContent = $p['content'];

				$content = ($p['content'] !== '' ? $rawContent : '"# New page\n"');
				// Render the Markdown-formatted page content in HTML
				if($mimeType == 'text/bbcode') {
					$renderedContent = Zlib\NativeWikiPage::convert_links(zidify_links(smilies(bbcode($content))), argv(0) . '/' . argv(1) . '/' . $wikiUrlName);
				}
				else {
					$content = Zlib\MarkdownSoap::unescape($content);
					$html = Zlib\NativeWikiPage::generate_toc(zidify_text(MarkdownExtra::defaultTransform(Zlib\NativeWikiPage::bbcode($content))));
					$renderedContent = Zlib\NativeWikiPage::convert_links($html, argv(0) . '/' . argv(1) . '/' . $wikiUrlName);
				}
				$showPageControls = $wiki_editor;
				break;
			default:	// Strip the extraneous URL components
				goaway('/' . argv(0) . '/' . argv(1) . '/' . $wikiUrlName . '/' . $pageUrlName);
		}
		

		$wikiModalID = random_string(3);

		$wikiModal = replace_macros(get_markup_template('generic_modal.tpl'), array(
			'$id' => $wikiModalID,
			'$title' => t('Revision Comparison'),
			'$ok' => (($showPageControls) ? t('Revert') : ''),
			'$cancel' => t('Cancel')
		));

		$placeholder = t('Short description of your changes (optional)');
				
		$o .= replace_macros(get_markup_template('wiki.tpl'),array(
			'$wikiheaderName' => $wikiheaderName,
			'$wikiheaderPage' => $wikiheaderPage,
			'$renamePage' => $renamePage,
			'$showPageControls' => $showPageControls,
			'$editOrSourceLabel' => (($showPageControls) ? t('Edit') : t('Source')),
			'$tools_label' => 'Page Tools',
			'$channel' => $owner['channel_address'],
			'$resource_id' => $resource_id,
			'$page' => $pageUrlName,
			'$mimeType' => $mimeType,
			'$content' => $content,
			'$renderedContent' => $renderedContent,
			'$pageRename' => array('pageRename', t('New page name'), '', ''),
			'$commitMsg' => array('commitMsg', '', '', '', '', 'placeholder="' . $placeholder . '"'),
			'$wikiModal' => $wikiModal,
			'$wikiModalID' => $wikiModalID,
			'$commit' => 'HEAD',
			'$embedPhotos' => t('Embed image from photo albums'),
			'$embedPhotosModalTitle' => t('Embed an image from your albums'),
			'$embedPhotosModalCancel' => t('Cancel'),
			'$embedPhotosModalOK' => t('OK'),
			'$modalchooseimages' => t('Choose images to embed'),
			'$modalchoosealbum' => t('Choose an album'),
			'$modaldiffalbum' => t('Choose a different album'),
			'$modalerrorlist' => t('Error getting album list'),
			'$modalerrorlink' => t('Error getting photo link'),
			'$modalerroralbum' => t('Error getting album'),
		));

		if($p['mimeType'] != 'text/bbcode')
			head_add_js('/library/ace/ace.js');	// Ace Code Editor

		return $o;
	}

	function post() {

		require_once('include/bbcode.php');

		$nick = argv(1);
		$owner = channelx_by_nick($nick);
		$observer_hash = get_observer_hash();

		if(! $owner) {
			notice( t('Permission denied.') . EOL);
			return;
		}

		// /wiki/channel/preview
		// Render mardown-formatted text in HTML for preview
		if((argc() > 2) && (argv(2) === 'preview')) {
			$content = $_POST['content'];
			$resource_id = $_POST['resource_id'];
			$w = Zlib\NativeWiki::get_wiki($owner['channel_id'],$observer_hash,$resource_id);

			$wikiURL = argv(0) . '/' . argv(1) . '/' . $w['urlName'];

			$mimeType = $w['mimeType'];

			if($mimeType == 'text/bbcode') {
				$html = Zlib\NativeWikiPage::convert_links(zidify_links(smilies(bbcode($content))),$wikiURL);
			}
			else {

				$bb = Zlib\NativeWikiPage::bbcode($content);
				$x = new ZLib\MarkdownSoap($bb);
				$md = $x->clean();
				$md = ZLib\MarkdownSoap::unescape($md);
				$html = MarkdownExtra::defaultTransform($md);
				$html = Zlib\NativeWikiPage::generate_toc(zidify_text($html));
				$html = Zlib\NativeWikiPage::convert_links($html,$wikiURL);
			}
			json_return_and_die(array('html' => $html, 'success' => true));
		}
		
		// Create a new wiki
		// /wiki/channel/create/wiki
		if ((argc() > 3) && (argv(2) === 'create') && (argv(3) === 'wiki')) {

			// Only the channel owner can create a wiki, at least until we create a 
			// more detail permissions framework

			if (local_channel() !== intval($owner['channel_id'])) {
				goaway('/' . argv(0) . '/' . $nick . '/');
			} 
			$wiki = array(); 
			// Generate new wiki info from input name
			$wiki['postVisible'] = ((intval($_POST['postVisible'])) ? 1 : 0);
			$wiki['rawName']     = $_POST['wikiName'];
			$wiki['htmlName']    = escape_tags($_POST['wikiName']);
			$wiki['urlName']     = urlencode(urlencode($_POST['wikiName'])); 
			$wiki['mimeType']    = $_POST['mimeType'];

			if($wiki['urlName'] === '') {				
				notice( t('Error creating wiki. Invalid name.') . EOL);
				goaway('/wiki');
			}

			// Get ACL for permissions
			$acl = new \Zotlabs\Access\AccessList($owner);
			$acl->set_from_array($_POST);
			$r = Zlib\NativeWiki::create_wiki($owner, $observer_hash, $wiki, $acl);
			if($r['success']) {
				Zlib\NativeWiki::sync_a_wiki_item($owner['channel_id'],$r['item_id'],$r['item']['resource_id']);
				$homePage = Zlib\NativeWikiPage::create_page($owner['channel_id'],$observer_hash,'Home', $r['item']['resource_id']);
				if(! $homePage['success']) {
					notice( t('Wiki created, but error creating Home page.'));
					goaway(z_root() . '/wiki/' . $nick . '/' . $wiki['urlName']);
				}
				Zlib\NativeWiki::sync_a_wiki_item($owner['channel_id'],$homePage['item_id'],$r['item']['resource_id']);
				goaway(z_root() . '/wiki/' . $nick . '/' . $wiki['urlName'] . '/' . $homePage['page']['urlName']);
			}
			else {
				notice( t('Error creating wiki'));
				goaway(z_root() . '/wiki');
			}
		}

		// Delete a wiki
		if ((argc() > 3) && (argv(2) === 'delete') && (argv(3) === 'wiki')) {

			// Only the channel owner can delete a wiki, at least until we create a 
			// more detail permissions framework
			if (local_channel() !== intval($owner['channel_id'])) {
				logger('Wiki delete permission denied.');
				json_return_and_die(array('message' => t('Wiki delete permission denied.'), 'success' => false));
			} 
			$resource_id = $_POST['resource_id']; 
			$deleted = Zlib\NativeWiki::delete_wiki($owner['channel_id'],$observer_hash,$resource_id);
			if ($deleted['success']) {
				Zlib\NativeWiki::sync_a_wiki_item($owner['channel_id'],$deleted['item_id'],$resource_id);
				json_return_and_die(array('message' => '', 'success' => true));
			} 
			else {
				logger('Error deleting wiki: ' . $resource_id . ' ' . $deleted['message']);
				json_return_and_die(array('message' => t('Error deleting wiki'), 'success' => false));
			}
		}


		// Create a page
		if ((argc() === 4) && (argv(2) === 'create') && (argv(3) === 'page')) {

			$resource_id = $_POST['resource_id']; 
			// Determine if observer has permission to create a page


			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(! $perms['write']) {
				logger('Wiki write permission denied. ' . EOL);
				json_return_and_die(array('success' => false));					
			}

			$name = $_POST['pageName']; //Get new page name
			if(urlencode(escape_tags($_POST['pageName'])) === '') {				
				json_return_and_die(array('message' => 'Error creating page. Invalid name.', 'success' => false));
			}
			$page = Zlib\NativeWikiPage::create_page($owner['channel_id'],$observer_hash, $name, $resource_id);

			if($page['item_id']) {
				$commit = Zlib\NativeWikiPage::commit(array(
					'commit_msg'    => t('New page created'), 
					'resource_id'   => $resource_id, 
					'channel_id'    => $owner['channel_id'],
					'observer_hash' => $observer_hash,
					'pageUrlName'   => $name
				));

				if($commit['success']) {
					Zlib\NativeWiki::sync_a_wiki_item($owner['channel_id'],$commit['item_id'],$resource_id);
					json_return_and_die(array('url' => '/' . argv(0) . '/' . argv(1) . '/' . urlencode($page['wiki']['urlName']) . '/' . urlencode($page['page']['urlName']), 'success' => true));
				} 
				else {
					json_return_and_die(array('message' => 'Error making git commit','url' => '/' . argv(0) . '/' . argv(1) . '/' . urlencode($page['wiki']['urlName']) . '/' . urlencode($page['page']['urlName']),'success' => false));
				}				


			}
			else {
				logger('Error creating page');
				json_return_and_die(array('message' => 'Error creating page.', 'success' => false));
			}
		}		
		
		// Fetch page list for a wiki
		if((argc() === 5) && (argv(2) === 'get') && (argv(3) === 'page') && (argv(4) === 'list')) {
			$resource_id = $_POST['resource_id']; // resource_id for wiki in db

			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(!$perms['read']) {
				logger('Wiki read permission denied.' . EOL);
				json_return_and_die(array('pages' => null, 'message' => 'Permission denied.', 'success' => false));					
			}

			// @FIXME - we shouldn't invoke this if it isn't in the PDL or has been over-ridden

			$x = new \Zotlabs\Widget\Wiki_pages();

			$page_list_html = $x->widget(array(
					'resource_id' => $resource_id, 
					'refresh' => true, 
					'channel' => argv(1)));
			json_return_and_die(array('pages' => $page_list_html, 'message' => '', 'success' => true));					
		}
		
		// Save a page
		if ((argc() === 4) && (argv(2) === 'save') && (argv(3) === 'page')) {
			
			$resource_id = $_POST['resource_id']; 
			$pageUrlName = $_POST['name'];
			$pageHtmlName = escape_tags($_POST['name']);
			$content = $_POST['content']; //Get new content
			$commitMsg = $_POST['commitMsg']; 
			if ($commitMsg === '') {
				$commitMsg = 'Updated ' . $pageHtmlName;
			}

			// Determine if observer has permission to save content
			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(! $perms['write']) {
				logger('Wiki write permission denied. ' . EOL);
				json_return_and_die(array('success' => false));					
			}
			
			$saved = Zlib\NativeWikiPage::save_page(array('channel_id' => $owner['channel_id'], 'observer_hash' => $observer_hash, 'resource_id' => $resource_id, 'pageUrlName' => $pageUrlName, 'content' => $content));

			if($saved['success']) {
				$commit = Zlib\NativeWikiPage::commit(array(
					'commit_msg' => $commitMsg, 
					'pageUrlName' => $pageUrlName,
					'resource_id' => $resource_id, 
					'channel_id'    => $owner['channel_id'],
					'observer_hash' => $observer_hash,
					'revision' => (-1)
				));
		
				if($commit['success']) {
					Zlib\NativeWiki::sync_a_wiki_item($owner['channel_id'],$commit['item_id'],$resource_id);
					json_return_and_die(array('message' => 'Wiki git repo commit made', 'success' => true));
				}
				else {
					json_return_and_die(array('message' => 'Error making git commit','success' => false));					
				}
			}
			else {
				json_return_and_die(array('message' => 'Error saving page', 'success' => false));					
			}
		}
		
		// Update page history
		// /wiki/channel/history/page
		if ((argc() === 4) && (argv(2) === 'history') && (argv(3) === 'page')) {
			
			$resource_id = $_POST['resource_id'];
			$pageUrlName = $_POST['name'];
			
			// Determine if observer has permission to read content

			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(! $perms['read']) {
				logger('Wiki read permission denied.' . EOL);
				json_return_and_die(array('historyHTML' => '', 'message' => 'Permission denied.', 'success' => false));
			}

			$historyHTML = \Zotlabs\Lib\NativeWikiPage::render_page_history(array(
				'resource_id' => $resource_id,
				'pageUrlName' => $pageUrlName,
				'permsWrite'  => $perms['write']
			));

			json_return_and_die(array('historyHTML' => $historyHTML, 'message' => '', 'success' => true));
		}

		// Delete a page
		if ((argc() === 4) && (argv(2) === 'delete') && (argv(3) === 'page')) {

			$resource_id = $_POST['resource_id']; 
			$pageUrlName = $_POST['name'];

			if ($pageUrlName === 'Home') {
				json_return_and_die(array('message' => t('Cannot delete Home'),'success' => false));
			}
			// Determine if observer has permission to delete pages
			// currently just allow page owner

			if((! local_channel()) || (local_channel() != $owner['channel_id'])) {
				logger('Wiki write permission denied. ' . EOL);
				json_return_and_die(array('success' => false));					
			}

			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(! $perms['write']) {
				logger('Wiki write permission denied. ' . EOL);
				json_return_and_die(array('success' => false));					
			}

			$deleted = Zlib\NativeWikiPage::delete_page(array('channel_id' => $owner['channel_id'], 'observer_hash' => $observer_hash, 'resource_id' => $resource_id, 'pageUrlName' => $pageUrlName));
			if($deleted['success']) {
				Zlib\NativeWiki::sync_a_wiki_item($owner['channel_id'],$commit['item_id'],$resource_id);
				json_return_and_die(array('message' => 'Wiki git repo commit made', 'success' => true));
			}
			else {
				json_return_and_die(array('message' => 'Error deleting page', 'success' => false));					
			}
		}
		
		// Revert a page
		if ((argc() === 4) && (argv(2) === 'revert') && (argv(3) === 'page')) {

			$resource_id = $_POST['resource_id']; 
			$pageUrlName = $_POST['name'];
			$commitHash = $_POST['commitHash'];
			// Determine if observer has permission to revert pages

			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(! $perms['write']) {
				logger('Wiki write permission denied.' . EOL);
				json_return_and_die(array('success' => false));					
			}

			$reverted = Zlib\NativeWikiPage::revert_page(array('channel_id' => $owner['channel_id'], 'observer_hash' => $observer_hash, 'commitHash' => $commitHash, 'resource_id' => $resource_id, 'pageUrlName' => $pageUrlName));
			if($reverted['success']) {
				json_return_and_die(array('content' => $reverted['content'], 'message' => '', 'success' => true));					
			} else {
				json_return_and_die(array('content' => '', 'message' => 'Error reverting page', 'success' => false));					
			}
		}
		
		// Compare page revisions
		if ((argc() === 4) && (argv(2) === 'compare') && (argv(3) === 'page')) {
			$resource_id = $_POST['resource_id']; 
			$pageUrlName = $_POST['name'];
			$compareCommit = $_POST['compareCommit'];
			$currentCommit = $_POST['currentCommit'];
			// Determine if observer has permission to revert pages

			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(!$perms['read']) {
				logger('Wiki read permission denied.' . EOL);
				json_return_and_die(array('success' => false));					
			}

			$compare = Zlib\NativeWikiPage::compare_page(array('channel_id' => $owner['channel_id'], 'observer_hash' => $observer_hash, 'currentCommit' => $currentCommit, 'compareCommit' => $compareCommit, 'resource_id' => $resource_id, 'pageUrlName' => $pageUrlName));
			if($compare['success']) {
				$diffHTML = '<table class="text-center" width="100%"><tr><td class="lead" width="50%">' . t('Current Revision') . '</td><td class="lead" width="50%">' . t('Selected Revision') . '</td></tr></table>' . $compare['diff'];
				json_return_and_die(array('diff' => $diffHTML, 'message' => '', 'success' => true));					
			} else {
				json_return_and_die(array('diff' => '', 'message' => 'Error comparing page', 'success' => false));					
			}
		}
		
		// Rename a page
		if ((argc() === 4) && (argv(2) === 'rename') && (argv(3) === 'page')) {
			$resource_id = $_POST['resource_id']; 
			$pageUrlName = $_POST['oldName'];
			$pageNewName = $_POST['newName'];
			if ($pageUrlName === 'Home') {
				json_return_and_die(array('message' => 'Cannot rename Home','success' => false));
			}
			if(urlencode(escape_tags($pageNewName)) === '') {				
				json_return_and_die(array('message' => 'Error renaming page. Invalid name.', 'success' => false));
			}
			// Determine if observer has permission to rename pages

			$perms = Zlib\NativeWiki::get_permissions($resource_id, intval($owner['channel_id']), $observer_hash);
			if(! $perms['write']) {
				logger('Wiki write permission denied. ' . EOL);
				json_return_and_die(array('success' => false));					
			}

			$renamed = Zlib\NativeWikiPage::rename_page(array('channel_id' => $owner['channel_id'], 'observer_hash' => $observer_hash, 'resource_id' => $resource_id, 'pageUrlName' => $pageUrlName, 'pageNewName' => $pageNewName));

			if($renamed['success']) {
				$commit = Zlib\NativeWikiPage::commit(array(
					'channel_id' => $owner['channel_id'],
					'commit_msg' => 'Renamed ' . urldecode($pageUrlName) . ' to ' . $renamed['page']['htmlName'], 
					'resource_id' => $resource_id, 
					'observer_hash' => $observer_hash,
					'pageUrlName' => $pageNewName
				));
				if($commit['success']) {
					Zlib\NativeWiki::sync_a_wiki_item($owner['channel_id'],$commit['item_id'],$resource_id);
					json_return_and_die(array('name' => $renamed['page'], 'message' => 'Wiki git repo commit made', 'success' => true));
				}
				else {
					json_return_and_die(array('message' => 'Error making git commit','success' => false));					
				}
			}
			else {
				json_return_and_die(array('message' => 'Error renaming page', 'success' => false));					
			}
		}

		//notice( t('You must be authenticated.'));
		json_return_and_die(array('message' => t('You must be authenticated.'), 'success' => false));
		
	}
}