//JavaScript HTML Sanitizer, (c) Alexander Yumashev, Jitbit Software.
//homepage https://github.com/jitbit/HtmlSanitizer
//License: MIT https://github.com/jitbit/HtmlSanitizer/blob/master/LICENSE
console.log('Sanitizer loading');
export var HtmlSanitizer = new (function () {
var tagWhitelist_ = {
'A': true, 'ABBR': true, 'B': true, 'BLOCKQUOTE': true, 'BODY': true, 'BR': true, 'CENTER': true, 'CODE': true, 'DIV': true, 'EM': true, 'FONT': true,
'H1': true, 'H2': true, 'H3': true, 'H4': true, 'H5': true, 'H6': true, 'HR': true, 'I': true, 'IMG': true, 'LABEL': true, 'LI': true, 'OL': true, 'P': true, 'PRE': true,
'SMALL': true, 'SOURCE': true, 'SPAN': true, 'STRONG': true, 'TABLE': true, 'TBODY': true, 'TR': true, 'TD': true, 'TH': true, 'THEAD': true, 'UL': true, 'U': true, 'VIDEO': true
};
var contentTagWhiteList_ = { 'FORM': true }; //tags that will be converted to DIVs
var attributeWhitelist_ = { 'align': true, 'color': true, 'controls': true, 'height': true, 'href': true, 'src': true, 'style': true, 'target': true, 'title': true, 'type': true, 'width': true };
var cssWhitelist_ = { 'color': true, 'background-color': true, 'font-size': true, 'text-align': true, 'text-decoration': true, 'font-weight': true };
var schemaWhiteList_ = [ 'http:', 'https:', 'data:', 'm-files:', 'file:', 'ftp:' ]; //which "protocols" are allowed in "href", "src" etc
var uriAttributes_ = { 'href': true, 'action': true };
this.SanitizeHtml = function(input) {
input = input.trim();
if (input == "") return ""; //to save performance and not create iframe
//firefox "bogus node" workaround
if (input == "
") return "";
var iframe = document.createElement('iframe');
if (iframe['sandbox'] === undefined) {
alert('Your browser does not support sandboxed iframes. Please upgrade to a modern browser.');
return '';
}
iframe['sandbox'] = 'allow-same-origin';
iframe.style.display = 'none';
document.body.appendChild(iframe); // necessary so the iframe contains a document
var iframedoc = iframe.contentDocument || iframe.contentWindow.document;
if (iframedoc.body == null) iframedoc.write(""); // null in IE
iframedoc.body.innerHTML = input;
function makeSanitizedCopy(node) {
if (node.nodeType == Node.TEXT_NODE) {
var newNode = node.cloneNode(true);
} else if (node.nodeType == Node.ELEMENT_NODE && (tagWhitelist_[node.tagName] || contentTagWhiteList_[node.tagName])) {
//remove useless empty spans (lots of those when pasting from MS Outlook)
if ((node.tagName == "SPAN" || node.tagName == "B" || node.tagName == "I" || node.tagName == "U")
&& node.innerHTML.trim() == "") {
return document.createDocumentFragment();
}
if (contentTagWhiteList_[node.tagName])
newNode = iframedoc.createElement('DIV'); //convert to DIV
else
newNode = iframedoc.createElement(node.tagName);
for (var i = 0; i < node.attributes.length; i++) {
var attr = node.attributes[i];
if (attributeWhitelist_[attr.name]) {
if (attr.name == "style") {
for (s = 0; s < node.style.length; s++) {
var styleName = node.style[s];
if (cssWhitelist_[styleName])
newNode.style.setProperty(styleName, node.style.getPropertyValue(styleName));
}
}
else {
if (uriAttributes_[attr.name]) { //if this is a "uri" attribute, that can have "javascript:" or something
if (attr.value.indexOf(":") > -1 && !startsWithAny(attr.value, schemaWhiteList_))
continue;
}
newNode.setAttribute(attr.name, attr.value);
}
}
}
for (i = 0; i < node.childNodes.length; i++) {
var subCopy = makeSanitizedCopy(node.childNodes[i]);
newNode.appendChild(subCopy, false);
}
} else {
newNode = document.createDocumentFragment();
}
return newNode;
};
var resultElement = makeSanitizedCopy(iframedoc.body);
document.body.removeChild(iframe);
return resultElement.innerHTML
.replace(/]*>(\S)/g, "
\n$1")
.replace(/div>\n