diff --git a/mimetype.js b/mimetype.js
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+++ b/mimetype.js
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+/**
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+/**
+ * Namespace to hold functions related to convert mimetype to icons
+ *
+ * @namespace
+ */
+OC.MimeType = {
+
+	/**
+	 * Cache that maps mimeTypes to icon urls
+	 */
+	_mimeTypeIcons: {},
+
+	/**
+	 * Return the file icon we want to use for the given mimeType.
+	 * The file needs to be present in the supplied file list
+	 *
+	 * @param {string} mimeType The mimeType we want an icon for
+	 * @param {array} files The available icons in this theme
+	 * @return {string} The icon to use or null if there is no match
+	 */
+	_getFile: function(mimeType, files) {
+		var icon = mimeType.replace(new RegExp('/', 'g'), '-');
+
+		// Generate path
+		if (mimeType === 'dir' && files.includes('folder')) {
+			return 'folder';
+		} else if (mimeType === 'dir-encrypted' && files.includes('folder-encrypted')) {
+			return 'folder-encrypted';
+		} else if (mimeType === 'dir-shared' && files.includes('folder-shared')) {
+			return 'folder-shared';
+		} else if (mimeType === 'dir-public' && files.includes('folder-public')) {
+			return 'folder-public';
+		} else if ((mimeType === 'dir-external' || mimeType === 'dir-external-root') && files.includes('folder-external')) {
+			return 'folder-external';
+		} else if (files.includes(icon)) {
+			return icon;
+		} else if (files.includes(icon.split('-')[0])) {
+			return icon.split('-')[0];
+		} else if (files.includes('file')) {
+			return 'file';
+		}
+
+		return null;
+	},
+
+	/**
+	 * Return the url to icon of the given mimeType
+	 *
+	 * @param {string} mimeType The mimeType to get the icon for
+	 * @return {string} Url to the icon for mimeType
+	 */
+	getIconUrl: function(mimeType) {
+		if (typeof mimeType === 'undefined') {
+			return undefined;
+		}
+
+		while (mimeType in OC.MimeTypeList.aliases) {
+			mimeType = OC.MimeTypeList.aliases[mimeType];
+		}
+
+		if (mimeType in OC.MimeType._mimeTypeIcons) {
+			return OC.MimeType._mimeTypeIcons[mimeType];
+		}
+
+		// First try to get the correct icon from the current theme
+		var gotIcon = null;
+		var path = '';
+		if (OC.theme.folder !== '' && Array.isArray(OC.MimeTypeList.themes[OC.theme.folder])) {
+			path = OC.getRootPath() + '/themes/' + OC.theme.folder + '/core/img/filetypes/';
+			var icon = OC.MimeType._getFile(mimeType, OC.MimeTypeList.themes[OC.theme.folder]);
+
+			if (icon !== null) {
+				gotIcon = true;
+				path += icon;
+			}
+		}
+		if(OCA.Theming && gotIcon === null) {
+			path = OC.generateUrl('/apps/theming/img/core/filetypes/');
+			path += OC.MimeType._getFile(mimeType, OC.MimeTypeList.files);
+			gotIcon = true;
+		}
+
+		// If we do not yet have an icon fall back to the default
+		if (gotIcon === null) {
+			path = OC.getRootPath() + '/core/img/filetypes/';
+			path += OC.MimeType._getFile(mimeType, OC.MimeTypeList.files);
+		}
+
+		path += '.svg';
+
+		if(OCA.Theming) {
+			path += "?v=" + OCA.Theming.cacheBuster;
+		}
+
+		// Cache the result
+		OC.MimeType._mimeTypeIcons[mimeType] = path;
+		return path;
+	}
+
+};