cryptpad/www/common/diffMarked.js

425 lines
16 KiB
JavaScript

define([
'jquery',
'/api/config',
'/bower_components/marked/marked.min.js',
'/common/common-hash.js',
'/common/common-util.js',
'/common/hyperscript.js',
'/common/media-tag.js',
'/common/highlight/highlight.pack.js',
'/customize/messages.js',
'/bower_components/diff-dom/diffDOM.js',
'/bower_components/tweetnacl/nacl-fast.min.js',
'css!/common/highlight/styles/github.css'
],function ($, ApiConfig, Marked, Hash, Util, h, MediaTag, Highlight, Messages) {
var DiffMd = {};
var DiffDOM = window.diffDOM;
var renderer = new Marked.Renderer();
var restrictedRenderer = new Marked.Renderer();
var Mermaid = {
init: function () {}
};
require(['/code/mermaid.js', 'css!/code/mermaid.css'], function (_Mermaid) {
Mermaid = _Mermaid;
});
var highlighter = function () {
return function(code, lang) {
if (lang) {
try {
return Highlight.highlight(lang, code).value;
} catch (e) {
return code;
}
}
return code;
};
};
Marked.setOptions({
//sanitize: true, // Disable HTML
renderer: renderer,
highlight: highlighter(),
});
var toc = [];
var getTOC = function () {
var content = [h('h2', Messages.markdown_toc)];
toc.forEach(function (obj) {
// Only include level 2 headings
var level = obj.level - 1;
if (level < 1) { return; }
var a = h('a.cp-md-toc-link', {
href: '#',
'data-href': obj.id,
});
a.innerHTML = obj.title;
content.push(h('p.cp-md-toc-'+level, ['• ', a]));
});
return h('div.cp-md-toc', content).outerHTML;
};
DiffMd.render = function (md, sanitize, restrictedMd) {
Marked.setOptions({
renderer: restrictedMd ? restrictedRenderer : renderer,
});
var r = Marked(md, {
sanitize: sanitize
});
// Add Table of Content
if (!restrictedMd) {
r = r.replace(/<div class="cp-md-toc"><\/div>/g, getTOC());
}
toc = [];
return r;
};
var mediaMap = {};
var defaultCode = renderer.code;
renderer.code = function (code, language) {
if (language === 'mermaid' && code.match(/^(graph|pie|gantt|sequenceDiagram|classDiagram|gitGraph)/)) {
return '<pre class="mermaid">'+code+'</pre>';
} else {
return defaultCode.apply(renderer, arguments);
}
};
restrictedRenderer.code = renderer.code;
renderer.heading = function (text, level) {
var i = 0;
var safeText = text.toLowerCase().replace(/[^\w]+/g, '-');
var getId = function () {
return 'cp-md-' + i + '-' + safeText;
};
var id = getId();
var isAlreadyUsed = function (obj) { return obj.id === id; };
while (toc.some(isAlreadyUsed)) {
i++;
id = getId();
}
toc.push({
level: level,
id: id,
title: Util.stripTags(text)
});
return "<h" + level + " id=\"" + id + "\"><a href=\"#" + id + "\" class=\"anchor\"></a>" + text + "</h" + level + ">";
};
restrictedRenderer.heading = function (text) {
return text;
};
// Tasks list
var checkedTaskItemPtn = /^\s*(<p>)?\[[xX]\](<\/p>)?\s*/;
var uncheckedTaskItemPtn = /^\s*(<p>)?\[ ?\](<\/p>)?\s*/;
var bogusCheckPtn = /<input checked="" disabled="" type="checkbox">/;
var bogusUncheckPtn = /<input disabled="" type="checkbox">/;
renderer.listitem = function (text) {
var isCheckedTaskItem = checkedTaskItemPtn.test(text);
var isUncheckedTaskItem = uncheckedTaskItemPtn.test(text);
var hasBogusCheckedInput = bogusCheckPtn.test(text);
var hasBogusUncheckedInput = bogusUncheckPtn.test(text);
var isCheckbox = true;
if (isCheckedTaskItem) {
text = text.replace(checkedTaskItemPtn,
'<i class="fa fa-check-square" aria-hidden="true"></i>') + '\n';
} else if (isUncheckedTaskItem) {
text = text.replace(uncheckedTaskItemPtn,
'<i class="fa fa-square-o" aria-hidden="true"></i>') + '\n';
} else if (hasBogusCheckedInput) {
text = text.replace(bogusCheckPtn,
'<i class="fa fa-check-square" aria-hidden="true"></i>') + '\n';
} else if (hasBogusUncheckedInput) {
text = text.replace(bogusUncheckPtn,
'<i class="fa fa-square-o" aria-hidden="true"></i>') + '\n';
} else {
isCheckbox = false;
}
var cls = (isCheckbox) ? ' class="todo-list-item"' : '';
return '<li'+ cls + '>' + text + '</li>\n';
};
restrictedRenderer.listitem = function (text) {
if (bogusCheckPtn.test(text)) {
text = text.replace(bogusCheckPtn, '');
}
return '<li>' + text + '</li>\n';
};
renderer.image = function (href, title, text) {
if (href.slice(0,6) === '/file/') {
// DEPRECATED
// Mediatag using markdown syntax should not be used anymore so they don't support
// password-protected files
console.log('DEPRECATED: mediatag using markdown syntax!');
var parsed = Hash.parsePadUrl(href);
var secret = Hash.getSecrets('file', parsed.hash);
var src = (ApiConfig.fileHost || '') +Hash.getBlobPathFromHex(secret.channel);
var key = Hash.encodeBase64(secret.keys.cryptKey);
var mt = '<media-tag src="' + src + '" data-crypto-key="cryptpad:' + key + '"></media-tag>';
if (mediaMap[src]) {
mt += mediaMap[src];
}
mt += '</media-tag>';
return mt;
}
var out = '<img src="' + href + '" alt="' + text + '"';
if (title) {
out += ' title="' + title + '"';
}
out += this.options.xhtml ? '/>' : '>';
return out;
};
restrictedRenderer.image = renderer.image;
var renderParagraph = function (p) {
return /<media\-tag[\s\S]*>/i.test(p)? p + '\n': '<p>' + p + '</p>\n';
};
renderer.paragraph = function (p) {
if (p === '[TOC]') {
return '<p><div class="cp-md-toc"></div></p>';
}
return renderParagraph(p);
};
restrictedRenderer.paragraph = function (p) {
return renderParagraph(p);
};
var MutationObserver = window.MutationObserver;
var forbiddenTags = [
'SCRIPT',
'IFRAME',
'OBJECT',
'APPLET',
'VIDEO', // privacy implications of videos are the same as images
'AUDIO', // same with audio
];
var unsafeTag = function (info) {
/*if (info.node && $(info.node).parents('media-tag').length) {
// Do not remove elements inside a media-tag
return true;
}*/
if (['addAttribute', 'modifyAttribute'].indexOf(info.diff.action) !== -1) {
if (/^on/i.test(info.diff.name)) {
console.log("Rejecting forbidden element attribute with name", info.diff.name);
return true;
}
}
if (['addElement', 'replaceElement'].indexOf(info.diff.action) !== -1) {
var msg = "Rejecting forbidden tag of type (%s)";
if (info.diff.element && forbiddenTags.indexOf(info.diff.element.nodeName.toUpperCase()) !== -1) {
console.log(msg, info.diff.element.nodeName);
return true;
} else if (info.diff.newValue && forbiddenTags.indexOf(info.diff.newValue.nodeName.toUpperCase()) !== -1) {
console.log("Replacing restricted element type (%s) with PRE", info.diff.newValue.nodeName);
info.diff.newValue.nodeName = 'PRE';
}
}
};
var slice = function (coll) {
return Array.prototype.slice.call(coll);
};
var removeNode = function (node) {
if (!(node && node.parentElement)) { return; }
var parent = node.parentElement;
if (!parent) { return; }
console.log('removing %s tag', node.nodeName);
parent.removeChild(node);
};
var removeForbiddenTags = function (root) {
if (!root) { return; }
if (forbiddenTags.indexOf(root.nodeName.toUpperCase()) !== -1) { removeNode(root); }
slice(root.children).forEach(removeForbiddenTags);
};
/* remove listeners from the DOM */
var removeListeners = function (root) {
if (!root) { return; }
slice(root.attributes).map(function (attr) {
if (/^on/i.test(attr.name)) {
console.log('removing attribute', attr.name, root.attributes[attr.name]);
root.attributes.removeNamedItem(attr.name);
}
});
// all the way down
slice(root.children).forEach(removeListeners);
};
var domFromHTML = function (html) {
var Dom = new DOMParser().parseFromString(html, "text/html");
Dom.normalize();
removeForbiddenTags(Dom.body);
removeListeners(Dom.body);
return Dom;
};
var DD = new DiffDOM({
preDiffApply: function (info) {
if (unsafeTag(info)) { return true; }
},
});
var makeDiff = function (A, B, id) {
var Err;
var Els = [A, B].map(function (frag) {
if (typeof(frag) === 'object') {
if (!frag || (frag && !frag.body)) {
Err = "No body";
return;
}
var els = frag.body.querySelectorAll('#'+id);
if (els.length) {
return els[0];
}
}
Err = 'No candidate found';
});
if (Err) { return Err; }
var patch = DD.diff(Els[0], Els[1]);
return patch;
};
DiffMd.apply = function (newHtml, $content, common) {
var contextMenu = common.importMediaTagMenu();
var id = $content.attr('id');
if (!id) { throw new Error("The element must have a valid id"); }
var pattern = /(<media-tag src="([^"]*)" data-crypto-key="([^"]*)">)<\/media-tag>/g;
var unsafe_newHtmlFixed = newHtml.replace(pattern, function (all, tag, src) {
var mt = tag;
if (mediaMap[src]) { mt += mediaMap[src]; }
return mt + '</media-tag>';
});
var newDomFixed = domFromHTML(unsafe_newHtmlFixed);
if (!newDomFixed || !newDomFixed.body) { return; }
var safe_newHtmlFixed = newDomFixed.body.outerHTML;
var $div = $('<div>', {id: id}).append(safe_newHtmlFixed);
var Dom = domFromHTML($('<div>').append($div).html());
$content[0].normalize();
var mermaid_source = [];
var mermaid_cache = {};
var canonicalizeMermaidSource = function (src) {
// ignore changes to empty lines, since that won't affect
// since it will have no effect on the rendered charts
return src.replace(/\n[ \t]*\n*[ \t]*\n/g, '\n');
};
// iterate over the unrendered mermaid inputs, caching their source as you go
$(newDomFixed).find('pre.mermaid').each(function (index, el) {
if (el.childNodes.length === 1 && el.childNodes[0].nodeType === 3) {
var src = canonicalizeMermaidSource(el.childNodes[0].wholeText);
el.setAttribute('mermaid-source', src);
mermaid_source[index] = src;
}
});
// remember the previous scroll position
var $parent = $content.parent();
var scrollTop = $parent.scrollTop();
// iterate over rendered mermaid charts
$content.find('pre.mermaid:not([processed="true"])').each(function (index, el) {
// retrieve the attached source code which it was drawn
var src = el.getAttribute('mermaid-source');
// check if that source exists in the set of charts which are about to be rendered
if (mermaid_source.indexOf(src) === -1) {
// if it's not, then you can remove it
if (el.parentNode && el.parentNode.children.length) {
el.parentNode.removeChild(el);
}
} else if (el.childNodes.length === 1 && el.childNodes[0].nodeType !== 3) {
// otherwise, confirm that the content of the rendered chart is not a text node
// and keep a copy of it
mermaid_cache[src] = el.childNodes[0];
}
});
var oldDom = domFromHTML($content[0].outerHTML);
var patch = makeDiff(oldDom, Dom, id);
if (typeof(patch) === 'string') {
throw new Error(patch);
} else {
DD.apply($content[0], patch);
var $mts = $content.find('media-tag:not(:has(*))');
$mts.each(function (i, el) {
$(el).contextmenu(function (e) {
e.preventDefault();
$(contextMenu.menu).data('mediatag', $(el));
contextMenu.show(e);
});
MediaTag(el);
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
if (mutation.type === 'childList') {
var list_values = [].slice.call(mutation.target.children)
.map(function (el) { return el.outerHTML; })
.join('');
mediaMap[mutation.target.getAttribute('src')] = list_values;
observer.disconnect();
}
});
});
observer.observe(el, {
attributes: false,
childList: true,
characterData: false
});
});
// Fix Table of contents links
$content.find('a.cp-md-toc-link').off('click').click(function (e) {
e.preventDefault();
e.stopPropagation();
var $a = $(this);
if (!$a.attr('data-href')) { return; }
var target = document.getElementById($a.attr('data-href'));
if (target) { target.scrollIntoView(); }
});
// loop over mermaid elements in the rendered content
$content.find('pre.mermaid').each(function (index, el) {
// since you've simply drawn the content that was supplied via markdown
// you can assume that the index of your rendered charts matches that
// of those in the markdown source.
var src = mermaid_source[index];
el.setAttribute('mermaid-source', src);
var cached = mermaid_cache[src];
// check if you had cached a pre-rendered instance of the supplied source
if (typeof(cached) !== 'object') {
try {
Mermaid.init(undefined, $(el));
} catch (e) { console.error(e); }
return;
}
// if there's a cached rendering, empty out the contained source code
// which would otherwise be drawn again.
// apparently this is the fastest way to empty out an element
while (el.firstChild) { el.removeChild(el.firstChild); } //el.innerHTML = '';
// insert the cached graph
el.appendChild(cached);
// and set a flag indicating that this graph need not be reprocessed
el.setAttribute('data-processed', true);
});
}
// recover the previous scroll position to avoid jank
$parent.scrollTop(scrollTop);
};
return DiffMd;
});