CyTube/lib/xss.js
2015-01-08 20:07:01 -06:00

92 lines
2.2 KiB
JavaScript

var sanitizeHTML = require("sanitize-html");
// These tags are allowed in addition to the defaults
// See https://github.com/punkave/sanitize-html
const ALLOWED_TAGS = [
"button",
"center",
"details",
"font",
"h1",
"h2",
"img",
"marquee", // It pains me to do this, but a lot of people use it...
"section",
"span",
"summary"
];
const ALLOWED_ATTRIBUTES = [
"id",
"aria-*",
"border",
"class",
"color",
"data-*",
"height",
"role",
"style",
"title",
"valign",
"width"
];
var ATTRIBUTE_MAP = {
a: ["href", "name", "target"],
font: ["size"],
img: ["src"],
marquee: ["behavior", "behaviour", "direction", "scrollamount"],
table: ["cellpadding", "cellspacing"],
th: ["colspan", "rowspan"],
td: ["colspan", "rowspan"]
}
for (var key in ATTRIBUTE_MAP) {
ALLOWED_ATTRIBUTES.forEach(function (attr) {
ATTRIBUTE_MAP[key].push(attr);
});
}
sanitizeHTML.defaults.allowedTags.concat(ALLOWED_TAGS).forEach(function (tag) {
if (!(tag in ATTRIBUTE_MAP)) {
ATTRIBUTE_MAP[tag] = ALLOWED_ATTRIBUTES;
}
});
const SETTINGS = {
allowedTags: sanitizeHTML.defaults.allowedTags.concat(ALLOWED_TAGS),
allowedAttributes: ATTRIBUTE_MAP
};
function sanitizeText(str) {
str = str.replace(/&/g, "&")
.replace(/</g, "&lt;")
.replace(/>/g, "&gt;")
.replace(/"/g, "&quot;")
.replace(/'/g, "&#39;")
.replace(/\(/g, "&#40;")
.replace(/\)/g, "&#41;");
return str;
}
function decodeText(str) {
str = str.replace(/&#([0-9]{2,7});?/g, function (m, p1) {
return String.fromCharCode(parseInt(p1));
});
str = str.replace(/&#x([0-9a-f]{2,7});?/ig, function (m, p1) {
return String.fromCharCode(parseInt(p1, 16));
});
str = str.replace(/&lt;/g, "<")
.replace(/&gt;/g, ">")
.replace(/&quot;/g, "\"")
.replace(/&amp;/g, "&");
return str;
}
module.exports.sanitizeHTML = function (html) {
return sanitizeHTML(html, SETTINGS);
};
module.exports.sanitizeText = sanitizeText;
module.exports.decodeText = decodeText;