mirror of
https://codeberg.org/nobody/LocalCDN.git
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126 lines
4.1 KiB
JavaScript
126 lines
4.1 KiB
JavaScript
/**
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* Remove integrity checks from embedded CSS and JavaScript files
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* Belongs to LocalCDN.
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*
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* @author nobody42
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* @since 2020-02-27
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*
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* @license MPL 2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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'use strict';
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/**
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* Manipulate DOM
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*/
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var manipulateDOM = {};
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/**
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* Private Methods
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*/
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manipulateDOM._getEncoding = function (domain) {
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let encodingByDomain = CharsetDomains[domain];
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if(typeof encodingByDomain === 'undefined') {
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return 'UTF-8';
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}
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return encodingByDomain;
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};
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manipulateDOM._removeCrossOriginAndIntegrityAttr = function (details) {
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// by Jaap (https://gitlab.com/Jaaap)
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let header = details.responseHeaders.find(h => h.name.toLowerCase() === 'content-type');
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if (header && BrowserType.FIREFOX) {
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let mimeType, initiatorDomain, isWhitelisted;
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mimeType = header.value.replace(/;.*/, '').toLowerCase();
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initiatorDomain = helpers.extractDomainFromUrl(details.url, true) || Address.EXAMPLE;
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isWhitelisted = stateManager._domainIsWhitelisted(initiatorDomain);
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if (!isWhitelisted && mimeType === 'text/html') {
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let asciiDecoder, decoder, encoder, charset, isFirstData, filter;
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asciiDecoder = new TextDecoder('ASCII');
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encoder = new TextEncoder();
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charset = /charset\s*=/.test(header.value) && header.value.replace(/^.*?charset\s*=\s*/, '');
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isFirstData = true;
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filter = browser.webRequest.filterResponseData(details.requestId);
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header.value = 'text/html; charset=UTF-8';
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//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.
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filter.ondata = evt => {
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if (isFirstData) {
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if (!charset) {
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//content-type has no charset declared
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let htmlHead = asciiDecoder.decode(evt.data, {stream: false});
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let charsetMatch = htmlHead.match(/<meta\s+charset=["']?([^>"'\/]+)["'>\/]/i);
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if (!charsetMatch) {
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charsetMatch = htmlHead.match(/<meta\s+http-equiv=["']?content-type["']?\s+content=["']?text\/html;\s+charset=([^>"'\/]+)["'>\/]/i);
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}
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charset = charsetMatch ? charsetMatch[1] : "UTF-8";
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}
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decoder = new TextDecoder(charset);
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}
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//remove crossorigin and integrity attributes
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let str = decoder.decode(evt.data, {stream: true}).replace(/<(link|script)[^>]+>/ig, m => {
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if (cdnDomainsRE.test(m)) {
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return m.replace(/\s+(integrity|crossorigin)(="[^"]*"|='[^']*'|=[^"'`=\s]+|)/ig, '');
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}
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return m;
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});
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filter.write(encoder.encode(str));
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isFirstData = false;
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}
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filter.onstop = evt => {
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let str = decoder.decode(); //end-of-stream
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filter.write(encoder.encode(str));
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filter.close();
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}
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}
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return {responseHeaders: details.responseHeaders};
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} else if(BrowserType.CHROMIUM) {
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// Chromium browsers do not support webRequest.filterResponseData
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// https://bugs.chromium.org/p/chromium/issues/detail?id=487422
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console.warn('[ LocalCDN ] browser.webRequest.filterResponseData not supported by your browser.');
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}
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};
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/**
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* Initializations
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*/
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let whitelistedDomains = {};
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let cdnDomainsRE = new RegExp('//(' + Object.keys(mappings).map(m => m.replace(/\W/g, '\\$&')).join('|') + ')/');
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/**
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* Event Handlers
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*/
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chrome.webRequest.onHeadersReceived.addListener(
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manipulateDOM._removeCrossOriginAndIntegrityAttr,
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{'types': [WebRequestType.MAIN_FRAME], 'urls': [Address.ANY]},
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[WebRequest.BLOCKING, WebRequest.RESPONSE_HEADERS]
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);
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