LocalCDN-Firefox-Chrome-Brave/core/manipulate-dom.js

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/**
* Remove integrity checks from embedded CSS and JavaScript files
* Belongs to LocalCDN.
*
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* @author nobody
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* @since 2020-02-27
*
* @license MPL 2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/.
*/
'use strict';
/**
* Manipulate DOM
*/
var manipulateDOM = {};
/**
* Private Methods
*/
manipulateDOM._removeCrossOriginAndIntegrityAttr = function (details) {
if(!BrowserType.FIREFOX) {
// Chromium (and other) browsers do not support webRequest.filterResponseData
// https://bugs.chromium.org/p/chromium/issues/detail?id=487422
console.warn('[ LocalCDN ] browser.webRequest.filterResponseData not supported by your browser.');
return;
}
let initiatorDomain, listedToManipulateDOM, negateHtmlFilter, filtering;
initiatorDomain = helpers.extractDomainFromUrl(details.url, true) || Address.EXAMPLE;
listedToManipulateDOM = stateManager._domainIsListed(initiatorDomain, "manipulate-dom");
negateHtmlFilter = stateManager.getInvertOption;
if( ( negateHtmlFilter || listedToManipulateDOM ) && !( negateHtmlFilter && listedToManipulateDOM ) ) {
filtering = true;
} else {
filtering = false;
}
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// by Jaap (https://gitlab.com/Jaaap)
let header = details.responseHeaders.find(h => h.name.toLowerCase() === 'content-type');
if (header && filtering) {
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let mimeType, isAllowlisted;
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mimeType = header.value.replace(/;.*/, '').toLowerCase();
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isAllowlisted = stateManager._domainIsListed(initiatorDomain);
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if (!isAllowlisted && mimeType === 'text/html') {
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let asciiDecoder, decoder, encoder, charset, isFirstData, filter;
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charset = /charset\s*=/.test(header.value) && header.value.replace(/^.*?charset\s*=\s*/, '').replace(/["']?/g, '');
// Check if charset is supported by TextDecoder()
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if(/charset\s*=/.test(header.value) && !EncodingTypes[charset.toString().toLowerCase()]){
console.error('[ LocalCDN ] Unsupported charset: ' + charset);
return;
}
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asciiDecoder = new TextDecoder('ASCII');
encoder = new TextEncoder();
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isFirstData = true;
filter = browser.webRequest.filterResponseData(details.requestId);
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header.value = 'text/html; charset=UTF-8';
//Note that this will not work if the '<script crossorigin="anonymous" src="dfgsfgd.com">' string is divided into two chunks, but we want to flush this data asap.
filter.ondata = evt => {
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if (isFirstData) {
if (!charset) {
//content-type has no charset declared
let htmlHead = asciiDecoder.decode(evt.data, {stream: false});
let charsetMatch = htmlHead.match(/<meta.*charset=["']?([^>"'\/]+)["'].*[>\/]/i);
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charset = charsetMatch ? charsetMatch[1] : "UTF-8";
}
decoder = new TextDecoder(charset);
}
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//remove crossorigin and integrity attributes
let str = decoder.decode(evt.data, {stream: true}).replace(/<(link|script)[^>]+>/ig, m => {
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if (cdnDomainsRE.test(m)) {
return m.replace(/\s+(integrity|crossorigin)(="[^"]*"|='[^']*'|=[^"'`=\s]+|)/ig, '');
}
return m;
});
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filter.write(encoder.encode(str));
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isFirstData = false;
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}
filter.onstop = evt => {
let str = decoder.decode(); //end-of-stream
filter.write(encoder.encode(str));
filter.close();
}
}
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return {responseHeaders: details.responseHeaders};
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}
};
/**
* Initializations
*/
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let allowlistedDomains = {};
let cdnDomainsRE = new RegExp('//(' + Object.keys(mappings.cdn).map(m => m.replace(/\W/g, '\\$&')).join('|') + ')/');
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/**
* Event Handlers
*/
chrome.webRequest.onHeadersReceived.addListener(
manipulateDOM._removeCrossOriginAndIntegrityAttr,
{'types': [WebRequestType.MAIN_FRAME], 'urls': [Address.ANY]},
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[WebRequest.BLOCKING, WebRequest.RESPONSE_HEADERS]
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);