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/** |
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* Nextcloud - Gallery |
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* |
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* |
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* This file is licensed under the Affero General Public License version 3 or |
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* later. See the COPYING file. |
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* |
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* @author Olivier Paroz <[email protected]> |
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* |
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* @copyright Olivier Paroz 2017 |
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*/ |
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/* global $, DOMPurify, OC, Gallery */ |
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/** |
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* A thumbnail is the actual image attached to the GalleryImage object |
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* |
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* @param {number} fileId |
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* @param {boolean} square |
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* @constructor |
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*/ |
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function Thumbnail (fileId, square) { |
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this.square = square; |
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this.fileId = fileId; |
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this.image = null; |
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this.loadingDeferred = new $.Deferred(); |
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this.height = 200; |
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this.width = 400; |
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this.ratio = null; |
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this.valid = true; |
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this.status = 200; |
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} |
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(function ($, OC, Gallery) { |
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"use strict"; |
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var Thumbnails = { |
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map: {}, |
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squareMap: {}, |
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/** |
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* Retrieves the thumbnail linked to the given fileID |
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* |
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* @param {number} fileId |
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* @param {boolean} square |
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* |
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* @returns {Thumbnail} |
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*/ |
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get: function (fileId, square) { |
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var map = {}; |
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if (square === true) { |
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map = Thumbnails.squareMap; |
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square = true; |
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} else { |
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map = Thumbnails.map; |
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square = false; |
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} |
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if (!map[fileId]) { |
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map[fileId] = new Thumbnail(fileId, square); |
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} |
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return map[fileId]; |
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}, |
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/** |
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* Returns an icon of a specific type |
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* |
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* -1 is for a folder |
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* -404 is for a broken file icon |
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* -500 is for a media type icon |
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* |
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* @param {number} type |
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* |
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* @returns {Thumbnail} |
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*/ |
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getStandardIcon: function (type) { |
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if (!Thumbnails.squareMap[type]) { |
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var icon = ''; |
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// true means square |
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var thumb = new Thumbnail(type, true); |
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thumb.image = new Image(); |
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thumb.image.onload = function () { |
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thumb.loadingDeferred.resolve(thumb.image); |
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}; |
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if (type === -1) { |
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icon = 'filetypes/folder'; |
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} |
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thumb.image.src = OC.imagePath('core', icon); |
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Thumbnails.squareMap[type] = thumb; |
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} |
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return Thumbnails.squareMap[type]; |
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}, |
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/** |
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* Loads thumbnails in batch, using EventSource |
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* |
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* @param {Array} ids |
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* @param {boolean} square |
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* |
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* @returns {{}} |
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*/ |
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loadBatch: function (ids, square) { |
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var map = (square) ? Thumbnails.squareMap : Thumbnails.map; |
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// Prevents re-loading thumbnails when resizing the window |
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ids = ids.filter(function (id) { |
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return !map[id]; |
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}); |
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var batch = {}; |
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var i, idsLength = ids.length; |
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if (idsLength) { |
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_.each(ids, function(id) { |
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var thumb = new Thumbnail(id, square); |
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thumb.image = new Image(); |
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map[id] = batch[id] = thumb; |
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thumb.image.onload = function () { |
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if (square) { |
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thumb.image.width = 200; |
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thumb.image.height = 200; |
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} |
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thumb.ratio = thumb.image.width / thumb.image.height; |
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thumb.image.originalWidth = 200 * thumb.ratio; |
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thumb.valid = true; |
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thumb.status = 200; |
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thumb.loadingDeferred.resolve(thumb.image); |
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console.log(thumb); |
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}; |
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thumb.image.onerror = function (data) { |
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thumb.loadingDeferred.resolve(null); |
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}; |
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var width = square ? 200 : 400; |
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thumb.image.src = Gallery.utility.buildGalleryUrl('preview', '/' + id, {width: width, height: 200}) + '&requesttoken=' + encodeURIComponent(oc_requesttoken); |
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}); |
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} |
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return batch; |
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}, |
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/** |
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* Sanitises SVGs |
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* |
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* We also fix a problem which arises when the XML contains comments |
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* |
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* @param imageData |
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* @returns {string|*} |
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* @private |
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*/ |
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_purifySvg: function (imageData) { |
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var pureSvg = DOMPurify.sanitize(window.atob(imageData), {ADD_TAGS: ['filter']}); |
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// Remove XML comment garbage left in the purified data |
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var badTag = pureSvg.indexOf(']>'); |
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var fixedPureSvg = pureSvg.substring(badTag < 0 ? 0 : 5, pureSvg.length); |
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imageData = window.btoa(fixedPureSvg); |
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return imageData; |
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} |
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}; |
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window.Thumbnails = Thumbnails; |
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})(jQuery, OC, Gallery); |
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nextcloud /
gallery
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To learn more about declaring variables in Javascript, see the MDN.