110 lines
3.3 KiB
JavaScript
110 lines
3.3 KiB
JavaScript
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define([
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'jquery',
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'/bower_components/marked/marked.min.js',
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'/bower_components/diff-dom/diffDOM.js'
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],function ($, Marked) {
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var DiffMd = {}
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var DiffDOM = window.diffDOM;
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var renderer = DiffMd.renderer = new Marked.Renderer();
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Marked.setOptions({
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renderer: renderer
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});
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DiffMd.render = function (md) {
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return Marked(md);
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};
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var forbiddenTags = [
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'SCRIPT',
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'IFRAME',
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'OBJECT',
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'APPLET',
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'VIDEO',
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'AUDIO',
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];
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var unsafeTag = function (info) {
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if (['addAttribute', 'modifyAttribute'].indexOf(info.diff.action) !== -1) {
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if (/^on/.test(info.diff.name)) {
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console.log("Rejecting forbidden element attribute with name", info.diff.name);
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return true;
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}
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}
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if (['addElement', 'replaceElement'].indexOf(info.diff.action) !== -1) {
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var msg = "Rejecting forbidden tag of type (%s)";
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if (info.diff.element && forbiddenTags.indexOf(info.diff.element.nodeName) !== -1) {
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console.log(msg, info.diff.element.nodeName);
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return true;
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} else if (info.diff.newValue && forbiddenTags.indexOf(info.diff.newValue.nodeName) !== -1) {
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console.log("Replacing restricted element type (%s) with PRE", info.diff.newValue.nodeName);
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info.diff.newValue.nodeName = 'PRE';
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}
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}
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};
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var slice = function (coll) {
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return Array.prototype.slice.call(coll);
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};
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/* remove listeners from the DOM */
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var removeListeners = function (root) {
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slice(root.attributes).map(function (attr) {
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if (/^on/.test(attr.name)) {
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root.attributes.removeNamedItem(attr.name);
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}
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});
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// all the way down
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slice(root.children).forEach(removeListeners);
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};
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var domFromHTML = function (html) {
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var Dom = new DOMParser().parseFromString(html, "text/html");
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removeListeners(Dom.body);
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return Dom;
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};
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var DD = new DiffDOM({
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preDiffApply: function (info) {
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if (unsafeTag(info)) { return true; }
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}
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});
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var makeDiff = function (A, B, id) {
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var Err;
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var Els = [A, B].map(function (frag) {
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if (typeof(frag) === 'object') {
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if (!frag || (frag && !frag.body)) {
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Err = "No body";
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return;
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}
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var els = frag.body.querySelectorAll('#'+id);
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if (els.length) {
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return els[0];
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}
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}
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Err = 'No candidate found';
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});
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if (Err) { return Err; }
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var patch = DD.diff(Els[0], Els[1]);
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return patch;
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};
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var apply = DiffMd.apply = function (newHtml, $content) {
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var id = $content.attr('id');
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if (!id) { throw new Error("The element must have a valid id"); }
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var $div = $('<div>', {id: id}).append(newHtml);
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var Dom = domFromHTML($('<div>').append($div).html());
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var oldDom = domFromHTML($content[0].outerHTML);
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var patch = makeDiff(oldDom, Dom, id);
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if (typeof(patch) === 'string') {
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throw new Error(patch);
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} else {
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DD.apply($content[0], patch);
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}
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};
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return DiffMd;
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});
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