LocalCDN-Firefox-Chrome-Brave/core/interceptor.js

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/**
* Interceptor
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* Belongs to LocalCDN (since 2020-02-26)
* (Origin: Decentraleyes)
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*
* @author Thomas Rientjes
* @since 2016-04-06
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*
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* @author nobody
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* @since 2020-02-26
*
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* @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';
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/**
* Interceptor
*/
var interceptor = {};
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/**
* Public Methods
*/
interceptor.handleRequest = function (requestDetails, tabIdentifier, tab) {
let validCandidate, targetDetails, targetPath, targetDetailURL;
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validCandidate = requestAnalyzer.isValidCandidate(requestDetails, tab);
if (!validCandidate) {
return {
'cancel': false
};
}
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if (interceptor._isBadResource(requestDetails.url)) {
console.log(`[ LocalCDN ] Evil resource blocked: ${requestDetails.url}`);
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log.append(tab.url, requestDetails.url, '-', true);
return {
'cancel': true
};
}
targetDetails = requestAnalyzer.getLocalTarget(requestDetails, tab.url);
targetPath = targetDetails.path;
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if (Regex.GOOGLE_FONTS.test(requestDetails.url)) {
let initiatorDomain, isListed;
initiatorDomain = helpers.extractDomainFromUrl(tab.url, true);
isListed = helpers.checkAllowlisted(initiatorDomain, interceptor.allowedDomainsGoogleFonts);
// Check if the website is allowed to load Google Fonts
if (interceptor.blockGoogleFonts === true && isListed === false) {
return {
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'redirectUrl': chrome.runtime.getURL('resources/google-fonts-placeholder.css')
};
} else if (interceptor.blockGoogleFonts === false || isListed === true) {
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return {
'cancel': false
};
}
}
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targetDetailURL = helpers.extractDomainFromUrl(requestDetails.url, true);
if (targetDetails === false && !IgnoredHost[targetDetailURL]) {
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++stateManager.tabs[tabIdentifier].missing;
}
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if (!targetDetails) {
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return interceptor._handleMissingCandidate(requestDetails.url, tabIdentifier);
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}
stateManager.requests[requestDetails.requestId] = {
tabIdentifier, targetDetails
};
return {
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'redirectUrl': chrome.runtime.getURL(targetPath + fileGuard.secret)
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};
};
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/**
* Private Methods
*/
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interceptor._handleMissingCandidate = function (requestUrl, tabIdentifier) {
let requestUrlSegments, injectionCount, missingCount;
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if (stateManager.showIconBadge === true) {
injectionCount = Object.keys(stateManager.tabs[tabIdentifier].injections).length || 0;
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if (stateManager.changeBadgeColorMissingResources === true) {
missingCount = stateManager.tabs[tabIdentifier].missing || 0;
if (missingCount > 0 && injectionCount === 0) {
wrappers.setBadgeText(tabIdentifier, injectionCount);
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}
} else {
wrappers.setBadgeText(tabIdentifier, injectionCount);
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}
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}
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if (interceptor.blockMissing === true) {
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return {
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'cancel': true
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};
}
requestUrlSegments = new URL(requestUrl);
if (requestUrlSegments.protocol === Address.HTTP) {
requestUrlSegments.protocol = Address.HTTPS;
requestUrl = requestUrlSegments.toString();
return {
'redirectUrl': requestUrl
};
} else {
return {
'cancel': false
};
}
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};
interceptor._handleStorageChanged = function (changes) {
if (Setting.XHR_TEST_DOMAIN in changes) {
interceptor.xhrTestDomain = changes.xhrTestDomain.newValue;
}
if (Setting.BLOCK_MISSING in changes) {
interceptor.blockMissing = changes.blockMissing.newValue;
}
if (Setting.BLOCK_GOOGLE_FONTS in changes) {
interceptor.blockGoogleFonts = changes.blockGoogleFonts.newValue;
}
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if (Setting.ALLOWED_DOMAINS_GOOGLE_FONTS in changes) {
interceptor.allowedDomainsGoogleFonts = changes.allowedDomainsGoogleFonts.newValue;
}
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};
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interceptor._isBadResource = function (requestUrl) {
requestUrl = requestUrl.replace(/(^\w+:|^)\/\//, '');
return Object.keys(BadResources).filter((path) => requestUrl.startsWith(path)).length !== 0;
};
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/**
* Event Handlers
*/
chrome.storage.onChanged.addListener(interceptor._handleStorageChanged);