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/*
* Copyright (c) 2016 ThoughtWorks, Inc.
*
* Pixelated is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pixelated is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
*/
define(['DOMPurify', 'he'], function (DOMPurify, he) {
'use strict';
/**
* Sanitizes a mail body to safe-to-display HTML
*/
var sanitizer = {};
sanitizer.whitelist = [{
// highlight tag open
pre: '<em class="search-highlight">',
post: '<em class="search-highlight">'
}, {
// highlight tag close
pre: '</em>',
post: '</em>'
}];
/**
* Adds html line breaks to a plaintext with line breaks (incl carriage return)
*
* @param {string} textPlainBody Plaintext input
* @returns {string} Plaintext with HTML line breals (<br/>)
*/
sanitizer.addLineBreaks = function (textPlainBody) {
return textPlainBody.replace(/(\r)?\n/g, '<br/>').replace(/(
)?
/g, '<br/>');
};
/**
* Runs a given dirty body through DOMPurify, thereby removing
* potentially hazardous XSS attacks. Please be advised that this
* will not act as a privacy leak prevention. Contained contents
* will still point to remote sources.
*
* For future reference: Running DOMPurify with these parameters
* can help mitigate some of the most widely used privacy leaks.
* FORBID_TAGS: ['style', 'svg', 'audio', 'video', 'math'],
* FORBID_ATTR: ['src']
*
* @param {string} dirtyBody The unsanitized string
* @return {string} Safe-to-display HTML string
*/
sanitizer.purifyHtml = function (dirtyBody) {
return DOMPurify.sanitize(dirtyBody, {
SAFE_FOR_JQUERY: true,
SAFE_FOR_TEMPLATES: true
});
};
/**
* Runs a given dirty body through he, thereby encoding everything
* as HTML entities.
*
* @param {string} dirtyBody The unsanitized string
* @return {string} Safe-to-display HTML string
*/
sanitizer.purifyText = function (dirtyBody) {
var escapedBody = he.encode(dirtyBody, {
encodeEverything: true
});
this.whitelist.forEach(function(entry) {
while (escapedBody.indexOf(entry.pre) > -1) {
escapedBody = escapedBody.replace(entry.pre, entry.post);
}
});
return escapedBody;
};
/**
* Calls #purify and #addLineBreaks to turn untrusted mail body content
* into safe-to-display HTML.
*
* NB: HTML content is preferred to plaintext content.
*
* @param {object} mail Pixelated Mail Object
* @return {string} Safe-to-display HTML string
*/
sanitizer.sanitize = function (mail) {
var body;
if (mail.htmlBody) {
body = this.purifyHtml(mail.htmlBody);
} else {
body = this.purifyText(mail.textPlainBody);
body = this.addLineBreaks(body);
}
return body;
};
/**
* Add hooks to DOMPurify for opening links in new windows
*/
DOMPurify.addHook('afterSanitizeAttributes', function (node) {
// set all elements owning target to target=_blank
if ('target' in node) {
node.setAttribute('target', '_blank');
}
// set non-HTML/MathML links to xlink:show=new
if (!node.hasAttribute('target') && (node.hasAttribute('xlink:href') || node.hasAttribute('href'))) {
node.setAttribute('xlink:show', 'new');
}
});
return sanitizer;
});
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