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Safeguard for unknown HTML cases in status content

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1. Mark up code blocks first because anything inside code blocks cannot be "enhanced".
2. Set default rejects for elements that don't need to be "enhanced". Not a complete list but best-effort. Probably allowlist works better than blocklist, but some content doesn't even start with any parent nodes.
This commit is contained in:
Lim Chee Aun 2022-12-23 09:20:34 +08:00
parent 206d40c0a4
commit 31e2196cd6
1 changed files with 67 additions and 17 deletions
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84
src/utils/enhance-content.js
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@ -29,20 +29,6 @@ function enhanceContent(content, opts = {}) {
node.replaceWith(...nodes);
});
// INLINE CODE
// ===========
// Convert `code` to <code>code</code>
textNodes = extractTextNodes(dom);
textNodes.forEach((node) => {
let html = node.nodeValue.replace(/</g, '&lt;').replace(/>/g, '&gt;');
if (/`[^`]+`/g.test(html)) {
html = html.replaceAll(/(`[^]+?`)/g, '<code>$1</code>');
}
fauxDiv.innerHTML = html;
const nodes = Array.from(fauxDiv.childNodes);
node.replaceWith(...nodes);
});
// CODE BLOCKS
// ===========
// Convert ```code``` to <pre><code>code</code></pre>
@ -57,10 +43,26 @@ function enhanceContent(content, opts = {}) {
block.replaceWith(pre);
});
// INLINE CODE
// ===========
// Convert `code` to <code>code</code>
textNodes = extractTextNodes(dom);
textNodes.forEach((node) => {
let html = node.nodeValue.replace(/</g, '&lt;').replace(/>/g, '&gt;');
if (/`[^`]+`/g.test(html)) {
html = html.replaceAll(/(`[^]+?`)/g, '<code>$1</code>');
}
fauxDiv.innerHTML = html;
const nodes = Array.from(fauxDiv.childNodes);
node.replaceWith(...nodes);
});
// TWITTER USERNAMES
// =================
// Convert @username@twitter.com to <a href="https://twitter.com/username">@username@twitter.com</a>
textNodes = extractTextNodes(dom);
textNodes = extractTextNodes(dom, {
rejectFilter: ['A'],
});
textNodes.forEach((node) => {
let html = node.nodeValue.replace(/</g, '&lt;').replace(/>/g, '&gt;');
if (/@[a-zA-Z0-9_]+@twitter\.com/g.test(html)) {
@ -83,12 +85,60 @@ function enhanceContent(content, opts = {}) {
return enhancedContent;
}
function extractTextNodes(dom) {
const defaultRejectFilter = [
// Document metadata
'STYLE',
// Image and multimedia
'IMG',
'VIDEO',
'AUDIO',
'AREA',
'MAP',
'TRACK',
// Embedded content
'EMBED',
'IFRAME',
'OBJECT',
'PICTURE',
'PORTAL',
'SOURCE',
// SVG and MathML
'SVG',
'MATH',
// Scripting
'CANVAS',
'NOSCRIPT',
'SCRIPT',
// Forms
'INPUT',
'OPTION',
'TEXTAREA',
// Web Components
'SLOT',
'TEMPLATE',
];
const defaultRejectFilterMap = Object.fromEntries(
defaultRejectFilter.map((nodeName) => [nodeName, true]),
);
function extractTextNodes(dom, opts = {}) {
const textNodes = [];
const walk = document.createTreeWalker(
dom,
NodeFilter.SHOW_TEXT,
null,
{
acceptNode(node) {
if (defaultRejectFilterMap[node.parentNode.nodeName]) {
return NodeFilter.FILTER_REJECT;
}
if (
opts.rejectFilter &&
opts.rejectFilter.includes(node.parentNode.nodeName)
) {
return NodeFilter.FILTER_REJECT;
}
return NodeFilter.FILTER_ACCEPT;
},
},
false,
);
let node;