1 /*jslint regexp: false */
  2 (function (GCN) {
  3 
  4 	'use strict';
  5 
  6 	/**
  7 	 * @private
  8 	 * @const
  9 	 * @type {object.<string, boolean>} Default page settings.
 10 	 */
 11 	var DEFAULT_SETTINGS = {
 12 		// Load folder information
 13 		folder: true,
 14 
 15 		// Lock page when loading it
 16 		update: true,
 17 
 18 		// Have language variants be included in the page response.
 19 		langvars: true,
 20 
 21 		// Have page variants be included in the page response.
 22 		pagevars: true
 23 	};
 24 
 25 	/**
 26 	 * Match URL to internal page
 27 	 *
 28 	 * @const
 29 	 * @type {RegExp}
 30 	 */
 31 	var INTERNAL_PAGEURL = /^(?:http.*)?\/CNPortletapp\/alohapage\?.*realid=([0-9]+).*$/;
 32 
 33 	/**
 34 	 * Match URL to internal file
 35 	 *
 36 	 * @const
 37 	 * @type {RegExp}
 38 	 */
 39 	var INTERNAL_FILEURL = /^http.*\?.*&do=16000&id=([0-9]+)&.*$/;
 40 
 41 
 42 	/**
 43 	 * Match URL to anchor
 44 	 *
 45 	 * @const
 46 	 * @type {RegExp}
 47 	 */
 48 	var ANCHOR_LINK = /(.+)#(.+)/;
 49 
 50 	/**
 51 	 * Checks whether the given tag is a magic link block.
 52 	 *
 53 	 * @param {TagAPI} tag A tag that must already have been fetched.
 54 	 * @param {Object} constructs Set of constructs.
 55 	 * @return {boolean} True if the given tag's constructId is equal to the
 56 	 *                   `MAGIC_LINK' value.
 57 	 */
 58 	function isMagicLinkTag(tag, constructs) {
 59 		return !!(constructs[GCN.settings.MAGIC_LINK]
 60 					&& (constructs[GCN.settings.MAGIC_LINK].constructId
 61 						=== tag.prop('constructId')));
 62 	}
 63 
 64 	/**
 65 	 * Given a page object, returns a jQuery set containing DOM elements for
 66 	 * each of the page's editable that is attached to the document.
 67 	 *
 68 	 * @param {PageAPI} page A page object.
 69 	 * @return {jQuery.<HTMLElement>} A jQuery set of editable DOM elements.
 70 	 */
 71 	function getEditablesInDocument(page) {
 72 		var id;
 73 		var $editables = jQuery();
 74 		var editables = page._editables;
 75 		for (id in editables) {
 76 			if (editables.hasOwnProperty(id)) {
 77 				$editables = $editables.add('#' + id);
 78 			}
 79 		}
 80 		return $editables;
 81 	}
 82 
 83 	/**
 84 	 * Returns all editables associated with the given page that have been
 85 	 * rendered in the document for editing.
 86 	 *
 87 	 * @param {PageAPI} page
 88 	 * @return {object} A set of editable objects.
 89 	 */
 90 	function getEditedEditables(page) {
 91 		return page._editables;
 92 	}
 93 
 94 	/**
 95 	 * Derives a list of the blocks that were rendered inside at least one of
 96 	 * the given page's edit()ed editables.
 97 	 *
 98 	 * @param {PageAPI} page Page object.
 99 	 * @return {Array.<object>} The set of blocks contained in any of the
100 	 *                          page's rendered editables.
101 	 */
102 	function getRenderedBlocks(page) {
103 		var editables = getEditedEditables(page);
104 		var id;
105 		var renderedBlocks = [];
106 		for (id in editables) {
107 			if (editables.hasOwnProperty(id)) {
108 				if (editables[id]._gcnContainedBlocks) {
109 					renderedBlocks = renderedBlocks.concat(
110 						editables[id]._gcnContainedBlocks
111 					);
112 				}
113 			}
114 		}
115 		return renderedBlocks;
116 	}
117 
118 	/**
119 	 * Gets the DOM element associated with the given block.
120 	 *
121 	 * @param {object} block
122 	 * @return {?jQuery.<HTMLElement>} A jQuery unit set of the block's
123 	 *                                 corresponding DOM element, or null if no
124 	 *                                 element for the given block exists in
125 	 *                                 the document.
126 	 */
127 	function getElement(block) {
128 		var $element = jQuery('#' + block.element);
129 		return $element.length ? $element : null;
130 	}
131 
132 	/**
133 	 * Retrieves a jQuery set of all link elements that are contained in
134 	 * editables associated with the given page.
135 	 *
136 	 * @param {PageAPI} page
137 	 * @return {jQuery.<HTMLElement>} A jQuery set of link elements.
138 	 */
139 	function getEditableLinks(page) {
140 		return getEditablesInDocument(page).find('a[href]');
141 	}
142 
143 	/**
144 	 * Determines all blocks that no longer need their tags to be kept in the
145 	 * given page's tag list.
146 	 *
147 	 * @param {PageAPI} page
148 	 * @param {function(Array.<object>)} success A callback function that
149 	 *                                           receives a list of obsolete
150 	 *                                           blocks.
151 	 * @param {function(GCNError):boolean=} error Optional custom error
152 	 *                                            handler.
153 	 */
154 	function getObsoleteBlocks(page, success, error) {
155 		var blocks = getRenderedBlocks(page);
156 		if (0 === blocks.length) {
157 			success([]);
158 			return;
159 		}
160 		var $links = getEditableLinks(page);
161 		var numToProcess = blocks.length;
162 		var obsolete = [];
163 		var onSuccess = function () {
164 			if ((0 === --numToProcess) && success) {
165 				success(obsolete);
166 			}
167 		};
168 		var onError = function (GCNError) {
169 			if (error) {
170 				return error(GCNError);
171 			}
172 		};
173 		page.constructs(function (constructs) {
174 			var processTag = function (block) {
175 				page.tag(block.tagname, function (tag) {
176 					if (isMagicLinkTag(tag, constructs) && !getElement(block)) {
177 						obsolete.push(block);
178 					}
179 					onSuccess();
180 				}, onError);
181 			};
182 			var i;
183 			for (i = 0; i < blocks.length; i++) {
184 				processTag(blocks[i]);
185 			}
186 		});
187 	}
188 
189 	/**
190 	 * Checks whether or not the given block has a corresponding element in the
191 	 * document DOM.
192 	 *
193 	 * @private
194 	 * @static
195 	 * @param {object}
196 	 * @return {boolean} True if an inline element for this block exists.
197 	 */
198 	function hasInlineElement(block) {
199 		return !!getElement(block);
200 	}
201 
202 	/**
203 	 * Matches "aloha-*" class names.
204 	 *
205 	 * @const
206 	 * @type {RegExp}
207 	 */
208 	var ALOHA_CLASS_NAMES = /\baloha-[a-z0-9\-\_]*\b/gi;
209 
210 	/**
211 	 * Strips unwanted names from the given className string.
212 	 *
213 	 * All class names beginning with "aloha-block*" will be removed.
214 	 *
215 	 * @param {string} classes Space seperated list of classes.
216 	 * @return {string} Sanitized classes string.
217 	 */
218 	function cleanBlockClasses(classes) {
219 		return classes ? jQuery.trim(classes.replace(ALOHA_CLASS_NAMES, ''))
220 		               : '';
221 	}
222 
223 
224 	/**
225 	 * Fetches the href attribute of a link and checks whether the browser
226 	 * added an absolute URL to an anchor link on the same page. This absolute
227 	 * url to the same page will be stripped before returning the href.
228 	 *
229 	 * @param {jQuery.<HTMLElement>} $link A link in an editable
230 	 * @return {string} href of the supplied link.
231 	 */
232 	function getHrefFromLink($link) {
233 		var href = $link.attr('href') || '';
234 		var anchorUrlMatch = href.match(ANCHOR_LINK);
235 		if (anchorUrlMatch && anchorUrlMatch[1] === window.location.href) {
236 			// check whether the href contains a link to an anchor on the current page
237 			// we only want the anchor link and not the absolute url
238 			href = '#' + anchorUrlMatch[2];
239 			$link.attr('href', href);
240 		}
241 		return href;
242 	}
243 
244 	/**
245 	 * Determines the backend object that was set to the given link.
246 	 *
247 	 * @param {jQuery.<HTMLElement>} $link A link in an editable.
248 	 * @return {Object} An object containing the gtxalohapagelink part keyword
249 	 *                  and value.  The keyword may be either be "url" or
250 	 *                  "fileurl" depending on the type of object linked to.
251 	 *                  The value may be a string url ("http://...") for
252 	 *                  external links or an integer for internal links.
253 	 */
254 	function getTagPartsFromLink($link) {
255 		var linkData = $link.attr('data-gentics-aloha-object-id');
256 		var tagparts = {
257 			text: $link.html(),
258 			title: $link.attr('title'),
259 			target: $link.attr('target'),
260 			language: $link.attr('hreflang'),
261 			'class': cleanBlockClasses($link.attr('class'))
262 		};
263 
264 		if (!linkData) {
265 			// check whether the href contains links to internal pages or files
266 			var href = getHrefFromLink($link),
267 				pageUrlMatch = href.match(INTERNAL_PAGEURL),
268 				fileUrlMatch = href.match(INTERNAL_FILEURL);
269 			if (pageUrlMatch) {
270 				tagparts.url = parseInt(pageUrlMatch[1], 10);
271 				tagparts.fileurl = 0;
272 				return tagparts;
273 			} else if (fileUrlMatch) {
274 				tagparts.url = 0;
275 				tagparts.fileurl = parseInt(fileUrlMatch[1], 10);
276 				return tagparts;
277 			} else {
278 				tagparts.url = $link.attr('href');
279 				return tagparts;
280 			}
281 		}
282 
283 		var idParts = linkData.split('.');
284 
285 		if (2 !== idParts.length) {
286 			tagparts.url = linkData;
287 		} else if ('10007' === idParts[0]) {
288 			tagparts.url = parseInt(idParts[1], 10);
289 			tagparts.fileurl = 0;
290 		} else if ('10008' === idParts[0] || '10011' === idParts[0]) {
291 			tagparts.url = 0;
292 			tagparts.fileurl = parseInt(idParts[1], 10);
293 		} else {
294 			tagparts.url = $link.attr('href');
295 		}
296 
297 		return tagparts;
298 	}
299 
300 	/**
301 	 * Checks whether a page object has a corresponding tag for a given link
302 	 * DOM element.
303 	 *
304 	 * @param {PageAPI} page The page object in which to look for the link tag.
305 	 * @param {jQuery.<HTMLElement>} $link jQuery unit set containing a link
306 	 *                                     DOM element.
307 	 * @return {boolean} True if there is a tag on the page that corresponds with
308 	 *                   the givn link.
309 	 */
310 	function hasTagForLink(page, $link) {
311 		var id = $link.attr('id');
312 		return !!(id && page._getBlockById(id));
313 	}
314 
315 	/**
316 	 * Checks whether or not the given part has a part type of the given
317 	 * name
318 	 *
319 	 * @param {TagAPI} tag
320 	 * @param {string} part Part name
321 	 * @return {boolean} True of part exists in the given tag.
322 	 */
323 	function hasTagPart(tag, part) {
324 		return !!tag._data.properties[part];
325 	}
326 
327 	/**
328 	 * Updates the parts of a tag in the page object that corresponds to the
329 	 * given link DOM element.
330 	 *
331 	 * @param {PageAPI} page
332 	 * @param {jQuery.<HTMLElement>} $link jQuery unit set containing a link
333 	 *                                     DOM element.
334 	 */
335 	function updateTagForLink(page, $link) {
336 		var block = page._getBlockById($link.attr('id'));
337 		// ASSERT(block)
338 		var tag = page.tag(block.tagname);
339 		var parts = getTagPartsFromLink($link);
340 		var part;
341 		for (part in parts) {
342 			if (parts.hasOwnProperty(part) && hasTagPart(tag, part)) {
343 				tag.part(part, parts[part]);
344 			}
345 		}
346 	}
347 
348 	/**
349 	 * Creates a new tag for the given link in the page.
350 	 *
351 	 * @param {PageAPI} page
352 	 * @param {jQuery.<HTMLElement>} $link jQuery unit set containing a link
353 	 *                                     element.
354 	 * @param {function} success Callback function that whill be called when
355 	 *                           the new tag is created.
356 	 * @param {function(GCNError):boolean=} error Optional custom error
357 	 *                                            handler.
358 	 */
359 	function createTagForLink(page, $link, success, error) {
360 		page.createTag({
361 			keyword: GCN.settings.MAGIC_LINK,
362 			magicValue: $link.html()
363 		}).edit(function (html, tag) {
364 			// Copy over the rendered id value for the link so that we can bind
365 			// the link in the DOM with the newly created block.
366 			$link.attr('id', jQuery(html).attr('id'));
367 			updateTagForLink(page, $link);
368 			success();
369 		}, error);
370 	}
371 
372 	/**
373 	 * Create tags for all new links in the page
374 	 * 
375 	 * @param {PageApi} page
376 	 * @param {jQuery.<HTMLElement>} $gcnlinks jQuery unit set containing links
377 	 * @param {function} success Callback function that will be called when the tags are created
378 	 * @param {function(GCNError)} error Optional custom error handler
379 	 */
380 	function createMissingLinkTags(page, $gcnlinks, success, error) {
381 		var $newGcnLinks = $gcnlinks.filter(function () {
382 			return !hasTagForLink(page, jQuery(this));
383 		}), linkData = {create:{}}, i = 0, id;
384 
385 		if ($newGcnLinks.length > 0) {
386 			$newGcnLinks.each(function (index) {
387 				id = 'link' + (i++);
388 				linkData.create[id] = {
389 					data: {
390 						keyword: GCN.settings.MAGIC_LINK,
391 						magicValue: jQuery(this).html()
392 					},
393 					obj: jQuery(this)
394 				};
395 			});
396 			page._createTags(linkData, function () {
397 				var id;
398 				for (id in linkData.create) {
399 					if (linkData.create.hasOwnProperty(id)) {
400 						linkData.create[id].obj.attr('id', jQuery(linkData.create[id].response.html).attr('id'));
401 					}
402 				}
403 				page._processRenderedTags(linkData.response);
404 				success();
405 			}, error);
406 		} else {
407 			success();
408 		}
409 
410 	}
411 
412 	/**
413 	 * Identifies internal GCN links in the given page's rendered editables,
414 	 * and updates their corresponding content tags, or create new tags for the
415 	 * if they are new links.
416 	 *
417 	 *  @param {PageAPI} page
418 	 *  @param {function} success
419 	 *  @param {function} error
420 	 */
421 	function processGCNLinks(page, success, error) {
422 		var $links = getEditableLinks(page);
423 		var $gcnlinks = $links.filter(function () {
424 			return this.isContentEditable;
425 		}).filter(':not(.aloha-editable)');
426 		if (0 === $gcnlinks.length) {
427 			if (success) {
428 				success();
429 			}
430 			return;
431 		}
432 		var numToProcess = $gcnlinks.length;
433 		var onSuccess = function () {
434 			if ((0 === --numToProcess) && success) {
435 				success();
436 			}
437 		};
438 		var onError = function (GCNError) {
439 			if (error) {
440 				return error(GCNError);
441 			}
442 		};
443 		createMissingLinkTags(page, $gcnlinks, function () {
444 			var i;
445 			for (i = 0; i < $gcnlinks.length; i++) {
446 				if (hasTagForLink(page, $gcnlinks.eq(i))) {
447 					updateTagForLink(page, $gcnlinks.eq(i));
448 					onSuccess();
449 				} else {
450 					onError(GCN.error('500', 'Missing Tag for Link', $gcnlinks.get(i)));
451 				}
452 			}
453 		}, onError);
454 	}
455 
456 	/**
457 	 * Adds the given blocks into the page's list of blocks that are to be
458 	 * deleted when the page is saved.
459 	 *
460 	 * @param {PageAPI} page
461 	 * @param {Array.<object>} blocks Blocks that are to be marked for deletion.
462 	 */
463 	function deleteBlocks(page, blocks) {
464 		blocks = jQuery.isArray(blocks) ? blocks : [blocks];
465 		var i;
466 		var success = function(tag) {
467 			tag.remove();
468 		};
469 		for (i = 0; i < blocks.length; i++) {
470 			if (-1 ===
471 					jQuery.inArray(blocks[i].tagname, page._deletedBlocks)) {
472 				page._deletedBlocks.push(blocks[i].tagname);
473 			}
474 			delete page._blocks[blocks[i].element];
475 
476 			page.tag(blocks[i].tagname, success);
477 		}
478 	}
479 
480 	/**
481 	 * Removes all tags on the given page which belong to links that are no
482 	 * longer present in any of the page's rendered editables.
483 	 *
484 	 * @param {PageAPI} page
485 	 * @param {function} success Callback function that will be invoked when
486 	 *                           all obsolete tags have been successfully
487 	 *                           marked for deletion.
488 	 * @param {function(GCNError):boolean=} error Optional custom error
489 	 *                                            handler.
490 	 */
491 	function deleteObsoleteLinkTags(page, success, error) {
492 		getObsoleteBlocks(page, function (obsolete) {
493 			deleteBlocks(page, obsolete);
494 			if (success) {
495 				success();
496 			}
497 		}, error);
498 	}
499 
500 	/**
501 	 * Searches for the an Aloha editable object of the given id.
502 	 *
503 	 * @TODO: Once Aloha.getEditableById() is patched to not cause an
504 	 *        JavaScript exception if the element for the given ID is not found
505 	 *        then we can deprecate this function and use Aloha's instead.
506 	 *
507 	 * @static
508 	 * @param {string} id Id of Aloha.Editable object to find.
509 	 * @return {Aloha.Editable=} The editable object, if wound; otherwise null.
510 	 */
511 	function getAlohaEditableById(id) {
512 		var Aloha = (typeof window !== 'undefined') && window.Aloha;
513 		if (!Aloha) {
514 			return null;
515 		}
516 
517 		// If the element is a textarea then route to the editable div.
518 		var element = jQuery('#' + id);
519 		if (element.length &&
520 				element[0].nodeName.toLowerCase() === 'textarea') {
521 			id += '-aloha';
522 		}
523 
524 		var editables = Aloha.editables;
525 		var j = editables.length;
526 		while (j) {
527 			if (editables[--j].getId() === id) {
528 				return editables[j];
529 			}
530 		}
531 
532 		return null;
533 	}
534 
535 	/**
536 	 * For a given list of editables and a list of blocks, determines in which
537 	 * editable each block is contained.  The result is a map of block sets.
538 	 * Each of these sets of blocks are mapped against the id of the editable
539 	 * in which they are rendered.
540 	 *
541 	 * @param {string} content The rendered content in which both the list of
542 	 *                         editables, and blocks are contained.
543 	 * @param {Array.<object>} editables A list of editables contained in the
544 	 *                                   content.
545 	 * @param {Array.<object>} blocks A list of blocks containd in the content.
546 	 * @return {object<string, Array>} A object whose keys are editable ids,
547 	 *                                  and whose values are arrays of blocks
548 	 *                                  contained in the corresponding
549 	 *                                  editable.
550 	 */
551 	function categorizeBlocksAgainstEditables(content, editables, blocks) {
552 		var i;
553 		var $content = jQuery('<div>' + content + '</div>');
554 		var sets = {};
555 		var editableId;
556 
557 		var editablesSelectors = [];
558 		for (i = 0; i < editables.length; i++) {
559 			editablesSelectors.push('#' + editables[i].element);
560 		}
561 
562 		var markerClass = 'aloha-editable-tmp-marker__';
563 		var $editables = $content.find(editablesSelectors.join(','));
564 		$editables.addClass(markerClass);
565 
566 		var $block;
567 		var $parent;
568 		for (i = 0; i < blocks.length; i++) {
569 			$block = $content.find('#' + blocks[i].element);
570 			if ($block.length) {
571 				$parent = $block.closest('.' + markerClass);
572 				if ($parent.length) {
573 					editableId = $parent.attr('id');
574 					if (editableId) {
575 						if (!sets[editableId]) {
576 							sets[editableId] = [];
577 						}
578 						sets[editableId].push(blocks[i]);
579 					}
580 				}
581 			}
582 		}
583 
584 		return sets;
585 	}
586 
587 	/**
588 	 * Causes the given editables to be tracked, so that when the content
589 	 * object is saved, these editables will be processed.
590 	 *
591 	 * @private
592 	 * @param {PageAPI} page
593 	 * @param {Array.<object>} editables A set of object representing
594 	 *                                   editable tags that have been
595 	 *                                   rendered.
596 	 */
597 	function trackEditables(page, editables) {
598 		if (!page.hasOwnProperty('_editables')) {
599 			page._editables = {};
600 		}
601 		var i;
602 		for (i = 0; i < editables.length; i++) {
603 			page._editables[editables[i].element] = editables[i];
604 		}
605 	}
606 
607 	/**
608 	 * Causes the given blocks to be tracked so that when the content object is
609 	 * saved, these editables will be processed.
610 	 *
611 	 * @private
612 	 * @param {PageAPI} page
613 	 * @param {Array.<object>} blocks An set of object representing block
614 	 *                                tags that have been rendered.
615 	 */
616 	function trackBlocks(page, blocks) {
617 		if (!page.hasOwnProperty('_blocks')) {
618 			page._blocks = {};
619 		}
620 		var i;
621 		for (i = 0; i < blocks.length; i++) {
622 			page._blocks[blocks[i].element] = blocks[i];
623 		}
624 	}
625 
626 	/**
627 	 * Associates a list of blocks with an editable so that it can later be
628 	 * determined which blocks are contained inside which editable.
629 	 *
630 	 * @param object
631 	 */
632 	function associateBlocksWithEditable(editable, blocks) {
633 		if (!jQuery.isArray(editable._gcnContainedBlocks)) {
634 			editable._gcnContainedBlocks = [];
635 		}
636 
637 		var i, j;
638 		for (i = 0; i < blocks.length; i++) {
639 			for (j = 0; j < editable._gcnContainedBlocks.length; j++) {
640 				if (blocks[i].element === editable._gcnContainedBlocks[j].element
641 						&& blocks[i].tagname === editable._gcnContainedBlocks[j].tagname) {
642 					// Prevent duplicates
643 					continue;
644 				}
645 
646 				editable._gcnContainedBlocks.push(blocks[i]);
647 			}
648 		}
649 	}
650 
651 	/**
652 	 * Extracts the editables and blocks that have been rendered from the
653 	 * REST API render call's response data, and stores them in the page.
654 	 *
655 	 * @param {PageAPI} page The page inwhich to track the incoming tags.
656 	 * @param {object} data Raw data containing editable and block tags
657 	 * information.
658 	 * @return {object} A object containing to lists: one list of blocks, and
659 	 *                  another of editables.
660 	 */
661 	function trackRenderedTags(page, data) {
662 		var tags = GCN.TagContainerAPI.getEditablesAndBlocks(data);
663 
664 		var containment = categorizeBlocksAgainstEditables(
665 			data.content,
666 			tags.editables,
667 			tags.blocks
668 		);
669 
670 		trackEditables(page, tags.editables);
671 		trackBlocks(page, tags.blocks);
672 
673 		jQuery.each(containment, function (editable, blocks) {
674 			if (page._editables[editable]) {
675 				associateBlocksWithEditable(page._editables[editable], blocks);
676 			}
677 		});
678 
679 		return tags;
680 	}
681 
682 	/**
683 	 * @private
684 	 * @const
685 	 * @type {number}
686 	 */
687 	//var TYPE_ID = 10007;
688 
689 	/**
690 	 * @private
691 	 * @const
692 	 * @type {Enum}
693 	 */
694 	var STATUS = {
695 
696 		// page was not found in the database
697 		NOTFOUND: -1,
698 
699 		// page is locally modified and not yet (re-)published
700 		MODIFIED: 0,
701 
702 		// page is marked to be published (dirty)
703 		TOPUBLISH: 1,
704 
705 		// page is published and online
706 		PUBLISHED: 2,
707 
708 		// Page is offline
709 		OFFLINE: 3,
710 
711 		// Page is in the queue (publishing of the page needs to be affirmed)
712 		QUEUE: 4,
713 
714 		// page is in timemanagement and outside of the defined timespan
715 		// (currently offline)
716 		TIMEMANAGEMENT: 5,
717 
718 		// page is to be published at a given time (not yet)
719 		TOPUBLISH_AT: 6
720 	};
721 
722 	/**
723 	 * @class
724 	 * @name PageAPI
725 	 * @extends ContentObjectAPI
726 	 * @extends TagContainerAPI
727 	 * 
728 	 * @param {number|string}
729 	 *            id of the page to be loaded
730 	 * @param {function(ContentObjectAPI))=}
731 	 *            success Optional success callback that will receive this
732 	 *            object as its only argument.
733 	 * @param {function(GCNError):boolean=}
734 	 *            error Optional custom error handler.
735 	 * @param {object}
736 	 *            settings additional settings for object creation. These
737 	 *            correspond to options available from the REST-API and will
738 	 *            extend or modify the PageAPI object.
739 	 *            <dl>
740 	 *            <dt>update: true</dt>
741 	 *            <dd>Whether the page should be locked in the backend when
742 	 *            loading it. default: true</dd>
743 	 *            <dt>template: true</dt>
744 	 *            <dd>Whether the template information should be embedded in
745 	 *            the page object. default: true</dd>
746 	 *            <dt>folder: true</dt>
747 	 *            <dd>Whether the folder information should be embedded in the
748 	 *            page object. default: true <b>WARNING</b>: do not turn this
749 	 *            option off - it will leave the API in a broken state.</dd>
750 	 *            <dt>langvars: true</dt>
751 	 *            <dd>When the language variants shall be embedded in the page
752 	 *            response. default: true</dd>
753 	 *            <dt>workflow: false</dt>
754 	 *            <dd>When the workflow information shall be embedded in the
755 	 *            page response. default: false</dd>
756 	 *            <dt>pagevars: true</dt>
757 	 *            <dd>When the page variants shall be embedded in the page
758 	 *            response. Page variants will contain folder information.
759 	 *            default: true</dd>
760 	 *            <dt>translationstatus: false</dt>
761 	 *            <dd>Will return information on the page's translation status.
762 	 *            default: false</dd>
763 	 *            </dl>
764 	 */
765 	var PageAPI = GCN.defineChainback({
766 		/** @lends PageAPI */
767 
768 		__chainbacktype__: 'PageAPI',
769 		_extends: [ GCN.TagContainerAPI, GCN.ContentObjectAPI ],
770 		_type: 'page',
771 
772 		/**
773 		 * A hash set of block tags belonging to this page.  This set grows as
774 		 * this page's tags are rendered.
775 		 *
776 		 * @private
777 		 * @type {Array.<object>}
778 		 */
779 		_blocks: {},
780 
781 		/**
782 		 * A hash set of editable tags belonging to this page.  This set grows
783 		 * as this page's tags are rendered.
784 		 *
785 		 * @private
786 		 * @type {Array.<object>}
787 		 */
788 		_editables: {},
789 
790 		/**
791 		 * Writable properties for the page object. Currently the following
792 		 * properties are writeable: cdate, description, fileName, folderId,
793 		 * name, priority, templateId. WARNING: changing the folderId might not
794 		 * work as expected.
795 		 * 
796 		 * @type {Array.string}
797 		 * @const
798 		 */
799 		WRITEABLE_PROPS: [
800 		                  'cdate',
801 		                  'description',
802 		                  'fileName',
803 		                  'folderId', // @TODO Check if moving a page is
804 		                              //       implemented correctly.
805 		                  'name',
806 		                  'priority',
807 		                  'templateId',
808 		                  'timeManagement'
809 		                  ],
810 
811 		/**
812 		 * @type {object} Constraints for writeable props
813 		 * @const
814 		 *
815 		 */
816 		WRITEABLE_PROPS_CONSTRAINTS: {
817 			'name': {
818 				maxLength: 255
819 			}
820 		},
821 
822 		/**
823 		 * Gets all blocks that are associated with this page.
824 		 *
825 		 * It is important to note that the set of blocks in the returned array
826 		 * will only include those that are the returned by the server when
827 		 * calling  edit() on a tag that belongs to this page.
828 		 *
829 		 * @return {Array.<object>} The set of blocks that have been
830 		 *                          initialized by calling edit() on one of
831 		 *                          this page's tags.
832 		 */
833 		'!blocks': function () {
834 			return this._blocks;
835 		},
836 
837 		/**
838 		 * Retrieves a block with the given id among the blocks that are
839 		 * tracked by this page content object.
840 		 *
841 		 * @private
842 		 * @param {string} id The block's id.
843 		 * @return {?object} The block data object.
844 		 */
845 		'!_getBlockById': function (id) {
846 			return this._blocks[id];
847 		},
848 
849 		/**
850 		 * Extracts the editables and blocks that have been rendered from the
851 		 * REST API render call's response data, and stores them in the page.
852 		 *
853 		 * @override
854 		 */
855 		'!_processRenderedTags': function (data) {
856 			return trackRenderedTags(this, data);
857 		},
858 
859 		/**
860 		 * Processes this page's tags in preparation for saving.
861 		 *
862 		 * The preparation process:
863 		 *
864 		 * 1. For all editables associated with this page, determine which of
865 		 *    their blocks have been rendered into the DOM for editing so that
866 		 *    changes to the DOM can be reflected in the corresponding data
867 		 *    structures before pushing the tags to the server.
868 		 *
869 		 * 2.
870 		 *
871 		 * Processes rendered tags, and updates the `_blocks' and `_editables'
872 		 * arrays accordingly.  This function is called during pre-saving to
873 		 * update this page's editable tags.
874 		 *
875 		 * @private
876 		 */
877 		'!_prepareTagsForSaving': function (success, error) {
878 			if (!this.hasOwnProperty('_deletedBlocks')) {
879 				this._deletedBlocks = [];
880 			}
881 			var page = this;
882 			processGCNLinks(page, function () {
883 				deleteObsoleteLinkTags(page, function () {
884 					page._updateEditableBlocks();
885 					if (success) {
886 						success();
887 					}
888 				}, error);
889 			}, error);
890 		},
891 
892 		/**
893 		 * Writes the contents of editables back into their corresponding tags.
894 		 * If a corresponding tag cannot be found for an editable, a new one
895 		 * will be created for it.
896 		 *
897 		 * A reference for each editable tag is then added to the `_shadow'
898 		 * object in order that the tag will be sent with the save request.
899 		 *
900 		 * @private
901 		 */
902 		'!_updateEditableBlocks': function () {
903 			var $element;
904 			var id;
905 			var editables = this._editables;
906 			var tags = this._data.tags;
907 			var tagname;
908 			var html;
909 			var alohaEditable;
910 			var $cleanElement;
911 			var customSerializer;
912 
913 			for (id in editables) {
914 				if (editables.hasOwnProperty(id)) {
915 					$element = jQuery('#' + id);
916 
917 					// Because the editable may not have have been rendered into
918 					// the document DOM.
919 					if (0 === $element.length) {
920 						continue;
921 					}
922 
923 					tagname = editables[id].tagname;
924 
925 					if (!tags[tagname]) {
926 						tags[tagname] = {
927 							name       : tagname,
928 							active     : true,
929 							properties : {}
930 						};
931 					} else {
932 						// Because it is sensible to assume that every editable
933 						// that was rendered for editing is intended to be an
934 						// activate tag.
935 						tags[tagname].active = true;
936 					}
937 
938 					// Because editables that have been aloha()fied, must have
939 					// their contents retrieved by getContents() in order to get
940 					// clean HTML.
941 
942 					alohaEditable = getAlohaEditableById(id);
943 
944 					if (alohaEditable) {
945 						// Avoid the unnecessary overhead of custom editable
946 						// serialization by calling html ourselves.
947 						$cleanElement = jQuery('<div>').append(
948 							alohaEditable.getContents(true)
949 						);
950 						alohaEditable.setUnmodified();
951 						// Apply the custom editable serialization as the last step.
952 						customSerializer = window.Aloha.Editable.getContentSerializer();
953 						html = this.encode($cleanElement, customSerializer);
954 					} else {
955 						html = this.encode($element);
956 					}
957 					// If the editable is backed by a parttype, that
958 					// would replace newlines by br tags while
959 					// rendering, remove all newlines before saving back
960 					if ($element.hasClass('GENTICS_parttype_text') ||
961 						$element.hasClass('GENTICS_parttype_texthtml') ||
962 						$element.hasClass('GENTICS_parttype_java_editor') ||
963 						$element.hasClass('GENTICS_parttype_texthtml_long')) {
964 						html = html.replace(/(\r\n|\n|\r)/gm,"");
965 					}
966 
967 					tags[tagname].properties[editables[id].partname] = {
968 						stringValue: html,
969 						type: 'RICHTEXT'
970 					};
971 
972 					this._update('tags.' + GCN.escapePropertyName(tagname),
973 						tags[tagname]);
974 				}
975 			}
976 		},
977 
978 		/**
979 		 * @see ContentObjectAPI.!_loadParams
980 		 */
981 		'!_loadParams': function () {
982 			return jQuery.extend(DEFAULT_SETTINGS, this._settings);
983 		},
984 
985 		/**
986 		 * Get this page's template.
987 		 *
988 		 * @public
989 		 * @function
990 		 * @name template
991 		 * @memberOf PageAPI
992 		 * @param {funtion(TemplateAPI)=} success Optional callback to receive
993 		 *                                        a {@link TemplateAPI} object
994 		 *                                        as the only argument.
995 		 * @param {function(GCNError):boolean=} error Optional custom error
996 		 *                                            handler.
997 		 * @return {TemplateAPI} This page's parent template.
998 		 */
999 		'!template': function (success, error) {
1000 			var id = this._fetched ? this.prop('templateId') : null;
1001 			return this._continue(GCN.TemplateAPI, id, success, error);
1002 		},
1003 
1004 		/**
1005 		 * Cache of constructs for this page.
1006 		 * Should be cleared when page is saved.
1007 		 */
1008 		_constructs: null,
1009 
1010 		/**
1011 		 * List of success and error callbacks that need to be called
1012 		 * once the constructs are loaded
1013 		 * @private
1014 		 * @type {array.<object>}
1015 		 */
1016 		_constructLoadHandlers: null,
1017 
1018 		/**
1019 		 * Retrieve the list of constructs of the tag that are used in this
1020 		 * page.
1021 		 *
1022 		 * Note that tags that have been created on this page locally, but have
1023 		 * yet to be persisted to the server (unsaved tags), will not have their
1024 		 * constructs included in the list unless their constructs are used by
1025 		 * other saved tags.
1026 		 */
1027 		'!constructs': function (success, error) {
1028 			var page = this;
1029 			if (page._constructs) {
1030 				return success(page._constructs);
1031 			}
1032 
1033 			// if someone else is already loading the constructs, just add the callbacks
1034 			page._constructLoadHandlers = page._constructLoadHandlers || [];
1035 			if (page._constructLoadHandlers.length > 0) {
1036 				page._constructLoadHandlers.push({success: success, error: error});
1037 				return;
1038 			}
1039 
1040 			// we are the first to load the constructs, register the callbacks and
1041 			// trigger the ajax call
1042 			page._constructLoadHandlers.push({success: success, error: error});
1043 			page._authAjax({
1044 				url: GCN.settings.BACKEND_PATH
1045 				     + '/rest/construct/list.json?pageId=' + page.id(),
1046 				type: 'GET',
1047 				error: function (xhr, status, msg) {
1048 					var i;
1049 					for (i = 0; i < page._constructLoadHandlers.length; i++) {
1050 						GCN.handleHttpError(xhr, msg, page._constructLoadHandlers[i].error);
1051 					}
1052 				},
1053 				success: function (response) {
1054 					var i;
1055 					if (GCN.getResponseCode(response) === 'OK') {
1056 						page._constructs = GCN.mapConstructs(response.constructs);
1057 						for (i = 0; i < page._constructLoadHandlers.length; i++) {
1058 							page._invoke(page._constructLoadHandlers[i].success, [page._constructs]);
1059 						}
1060 					} else {
1061 						for (i = 0; i < page._constructLoadHandlers.length; i++) {
1062 							GCN.handleResponseError(response, page._constructLoadHandlers[i].error);
1063 						}
1064 					}
1065 				},
1066 
1067 				complete: function () {
1068 					page._constructLoadHandlers = [];
1069 				}
1070 			});
1071 		},
1072 
1073 		/**
1074 		 * @override
1075 		 * @see ContentObjectAPI._save
1076 		 */
1077 		'!_save': function (settings, success, error) {
1078 			var page = this;
1079 			this._fulfill(function () {
1080 				page._read(function () {
1081 					var fork = page._fork();
1082 					fork._prepareTagsForSaving(function () {
1083 						GCN.pub('page.before-saved', fork);
1084 						fork._persist(settings, function () {
1085 							if (success) {
1086 								page._constructs = null;
1087 								fork._merge(false);
1088 								page._invoke(success, [page]);
1089 								page._vacate();
1090 							} else {
1091 								fork._merge();
1092 							}
1093 						}, error);
1094 					}, error);
1095 				}, error);
1096 			}, error);
1097 		},
1098 
1099 		//---------------------------------------------------------------------
1100 		// Surface the tag container methods that are applicable for GCN page
1101 		// objects.
1102 		//---------------------------------------------------------------------
1103 
1104 		/**
1105 		 * Creates a tag of a given tagtype in this page.
1106 		 * The first parameter should either be the construct keyword or ID,
1107 		 * or an object containing exactly one of the following property sets:<br/>
1108 		 * <ol>
1109 		 *   <li><i>keyword</i> to create a tag based on the construct with given keyword</li>
1110 		 *   <li><i>constructId</i> to create a tag based on the construct with given ID</li>
1111 		 *   <li><i>sourcePageId</i> and <i>sourceTagname</i> to create a tag as copy of the given tag from the page</li>
1112 		 * </ol>
1113 		 *
1114 		 * Exmaple:
1115 		 * <pre>
1116 		 *  createTag('link', onSuccess, onError);
1117 		 * </pre>
1118 		 * or
1119 		 * <pre>
1120 		 *  createTag({keyword: 'link', magicValue: 'http://www.gentics.com'}, onSuccess, onError);
1121 		 * </pre>
1122 		 * or
1123 		 * <pre>
1124 		 *  createTag({sourcePageId: 4711, sourceTagname: 'link'}, onSuccess, onError);
1125 		 * </pre>
1126 		 *
1127 		 * @public
1128 		 * @function
1129 		 * @name createTag
1130 		 * @memberOf PageAPI
1131 		 * @param {string|number|object} construct either the keyword of the
1132 		 *                               construct, or the ID of the construct
1133 		 *                               or an object with the following
1134 		 *                               properties
1135 		 *                               <ul>
1136 		 *                                <li><i>keyword</i> keyword of the construct</li>
1137 		 *                                <li><i>constructId</i> ID of the construct</li>
1138 		 *                                <li><i>magicValue</i> magic value to be filled into the tag</li>
1139 		 *                                <li><i>sourcePageId</i> source page id</li>
1140 		 *                                <li><i>sourceTagname</i> source tag name</li>
1141 		 *                               </ul>
1142 		 * @param {function(TagAPI)=} success Optional callback that will
1143 		 *                                    receive the newly created tag as
1144 		 *                                    its only argument.
1145 		 * @param {function(GCNError):boolean=} error Optional custom error
1146 		 *                                            handler.
1147 		 * @return {TagAPI} The newly created tag.
1148 		 * @throws INVALID_ARGUMENTS
1149 		 */
1150 		'!createTag': function () {
1151 			return this._createTag.apply(this, arguments);
1152 		},
1153 
1154 		/**
1155 		 * Deletes the specified tag from this page.
1156 		 * You should pass a keyword here not an Id.
1157 		 * 
1158 		 * Note: Due to how the underlying RestAPI layer works,
1159 		 * the success callback will also be called if the specified tag
1160 		 * does not exist.
1161 		 * 
1162 		 * @public
1163 		 * @function
1164 		 * @memberOf PageAPI
1165 		 * @param {string}
1166 		 *            keyword The keyword of the tag to be deleted.
1167 		 * @param {function(PageAPI)=}
1168 		 *            success Optional callback that receive this object as its
1169 		 *            only argument.
1170 		 * @param {function(GCNError):boolean=}
1171 		 *            error Optional custom error handler.
1172 		 */
1173 		removeTag: function () {
1174 			this._removeTag.apply(this, arguments);
1175 		},
1176 
1177 		/**
1178 		 * Deletes a set of tags from this page.
1179 		 * 
1180 		 * @public
1181 		 * @function
1182 		 * @memberOf PageAPI
1183 		 * @param {Array.
1184 		 *            <string>} keywords The keywords of the tags to be deleted.
1185 		 * @param {function(PageAPI)=}
1186 		 *            success Optional callback that receive this object as its
1187 		 *            only argument.
1188 		 * @param {function(GCNError):boolean=}
1189 		 *            error Optional custom error handler.
1190 		 */
1191 		removeTags: function () {
1192 			this._removeTags.apply(this, arguments);
1193 		},
1194 
1195 		/**
1196 		 * Takes the page offline.
1197 		 * If instant publishing is enabled, this will take the page offline
1198 		 * immediately. Otherwise it will be taken offline during the next
1199 		 * publish run.
1200 		 *
1201 		 * @public
1202 		 * @function
1203 		 * @memberOf PageAPI
1204 		 * @param {funtion(PageAPI)=} success Optional callback to receive this
1205 		 *                                    page object as the only argument.
1206 		 * @param {function(GCNError):boolean=} error Optional custom error
1207 		 *                                            handler.
1208 		 */
1209 		takeOffline: function (success, error) {
1210 			var page = this;
1211 			page._fulfill(function () {
1212 				page._authAjax({
1213 					url: GCN.settings.BACKEND_PATH + '/rest/' + page._type +
1214 					     '/takeOffline/' + page.id(),
1215 					type: 'POST',
1216 					json: {}, // There needs to be at least empty content
1217 					          // because of a bug in Jersey.
1218 					error: error,
1219 					success: function (response) {
1220 						if (success) {
1221 							page._invoke(success, [page]);
1222 						}
1223 					}
1224 				});
1225 			});
1226 		},
1227 
1228 		/**
1229 		 * Trigger publish process for the page.
1230 		 *
1231 		 * @public
1232 		 * @function
1233 		 * @memberOf PageAPI
1234 		 * @param {funtion(PageAPI)=} success Optional callback to receive this
1235 		 *                                    page object as the only argument.
1236 		 * @param {function(GCNError):boolean=} error Optional custom error
1237 		 *                                            handler.
1238 		 */
1239 		publish: function (success, error) {
1240 			var page = this;
1241 			GCN.pub('page.before-publish', page);
1242 			this._fulfill(function () {
1243 				page._authAjax({
1244 					url: GCN.settings.BACKEND_PATH + '/rest/' + page._type +
1245 					     '/publish/' + page.id() + GCN._getChannelParameter(page),
1246 					type: 'POST',
1247 					json: {}, // There needs to be at least empty content
1248 					          // because of a bug in Jersey.
1249 					success: function (response) {
1250 						page._data.status = STATUS.PUBLISHED;
1251 						if (success) {
1252 							page._invoke(success, [page]);
1253 						}
1254 					},
1255 					error: error
1256 				});
1257 			});
1258 		},
1259 
1260 		/**
1261 		 * Renders a preview of the current page.
1262 		 * 
1263 		 * @public
1264 		 * @function
1265 		 * @memberOf PageAPI
1266 		 * @param {function(string,
1267 		 *            PageAPI)} success Callback to receive the rendered page
1268 		 *            preview as the first argument, and this page object as the
1269 		 *            second.
1270 		 * @param {function(GCNError):boolean=}
1271 		 *            error Optional custom error handler.
1272 		 */
1273 		preview: function (success, error) {
1274 			var that = this;
1275 
1276 			this._read(function () {
1277 				that._authAjax({
1278 					url: GCN.settings.BACKEND_PATH + '/rest/' + that._type +
1279 					     '/preview/' + GCN._getChannelParameter(that),
1280 					json: {
1281 						page: that._data, // @FIXME Shouldn't this a be merge of
1282 						                 //        the `_shadow' object and the
1283 										 //        `_data'.
1284 						nodeId: that.nodeId()
1285 					},
1286 					type: 'POST',
1287 					error: error,
1288 					success: function (response) {
1289 						if (success) {
1290 							GCN._handleContentRendered(response.preview, that,
1291 								function (html) {
1292 									that._invoke(success, [html, that]);
1293 								});
1294 						}
1295 					}
1296 				});
1297 			}, error);
1298 		},
1299 
1300 		/**
1301 		 * Unlocks the page when finishing editing
1302 		 * 
1303 		 * @public
1304 		 * @function
1305 		 * @memberOf PageAPI
1306 		 * @param {funtion(PageAPI)=}
1307 		 *            success Optional callback to receive this page object as
1308 		 *            the only argument.
1309 		 * @param {function(GCNError):boolean=}
1310 		 *            error Optional custom error handler.
1311 		 */
1312 		unlock: function (success, error) {
1313 			var that = this;
1314 			this._fulfill(function () {
1315 				that._authAjax({
1316 					url: GCN.settings.BACKEND_PATH + '/rest/' + that._type +
1317 					     '/cancel/' + that.id() + GCN._getChannelParameter(that),
1318 					type: 'POST',
1319 					json: {}, // There needs to be at least empty content
1320 					          // because of a bug in Jersey.
1321 					error: error,
1322 					success: function (response) {
1323 						if (success) {
1324 							that._invoke(success, [that]);
1325 						}
1326 					}
1327 				});
1328 			});
1329 		},
1330 
1331 		/**
1332 		 * @see GCN.ContentObjectAPI._processResponse
1333 		 */
1334 		'!_processResponse': function (data) {
1335 			this._data = jQuery.extend(true, {}, data[this._type], this._data);
1336 
1337 			// if data contains page variants turn them into page objects
1338 			if (this._data.pageVariants) {
1339 				var pagevars = [];
1340 				var i;
1341 				for (i = 0; i < this._data.pageVariants.length; i++) {
1342 					pagevars.push(this._continue(GCN.PageAPI,
1343 						this._data.pageVariants[i]));
1344 				}
1345 				this._data.pageVariants = pagevars;
1346 			}
1347 		},
1348 
1349 		/**
1350 		 * @override
1351 		 */
1352 		'!_removeAssociatedTagData': function (tagid) {
1353 			var block;
1354 			for (block in this._blocks) {
1355 				if (this._blocks.hasOwnProperty(block) &&
1356 						this._blocks[block].tagname === tagid) {
1357 					delete this._blocks[block];
1358 				}
1359 			}
1360 
1361 			var editable, containedBlocks, i;
1362 			for (editable in this._editables) {
1363 				if (this._editables.hasOwnProperty(editable)) {
1364 					if (this._editables[editable].tagname === tagid) {
1365 						delete this._editables[editable];
1366 					} else {
1367 						containedBlocks = this._editables[editable]._gcnContainedBlocks;
1368 						if (jQuery.isArray(containedBlocks)) {
1369 							for (i = containedBlocks.length -1; i >= 0; i--) {
1370 								if (containedBlocks[i].tagname === tagid) {
1371 									containedBlocks.splice(i, 1);
1372 								}
1373 							}
1374 						}
1375 					}
1376 				}
1377 			}
1378 		}
1379 
1380 	});
1381 
1382 	/**
1383 	 * Creates a new instance of PageAPI.
1384 	 * See the {@link PageAPI} constructor for detailed information.
1385 	 * 
1386 	 * @function
1387 	 * @name page
1388 	 * @memberOf GCN
1389 	 * @see PageAPI
1390 	 */
1391 	GCN.page = GCN.exposeAPI(PageAPI);
1392 	GCN.PageAPI = PageAPI;
1393 
1394 	GCN.PageAPI.trackRenderedTags = trackRenderedTags;
1395 
1396 }(GCN));
1397