LocalCDN-Firefox-Chrome-Brave/core/request-analyzer.js

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/**
* Request Analyzer
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* Belongs to LocalCDN (since 2020-02-26)
* (Origin: Decentraleyes)
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*
* @author Thomas Rientjes
* @since 2016-04-11
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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';
/**
* Request Analyzer
*/
var requestAnalyzer = {};
/**
* Public Methods
*/
requestAnalyzer.isValidCandidate = function (requestDetails, tabDetails) {
let initiatorDomain, isWhitelisted;
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initiatorDomain = helpers.extractDomainFromUrl(tabDetails.url, true);
if (initiatorDomain === null) {
initiatorDomain = Address.EXAMPLE;
}
isWhitelisted = requestAnalyzer.whitelistedDomains[initiatorDomain];
if (isWhitelisted) {
return false;
}
// Font Awesome injections in Chromium deactivated (https://gitlab.com/nobody42/localcdn/-/issues/67)
if (BrowserType.CHROMIUM) {
if (/(font-awesome|fontawesome)/.test(requestDetails.url)) {
console.warn('[ LocalCDN ] Font Awesome is not fully supported by your browser.');
return false;
} else if (requestDetails.url.startsWith('https://fonts.googleapis.com')) {
// also valid for Google Material icons
console.warn('[ LocalCDN ] Google Material Icons are not fully supported by your browser.');
return false;
}
}
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// Disable LocalCDN if website is 'yandex.com' and CDN is 'yastatic.net', because website and CDN are the same.
if (tabDetails.url.includes('yandex.com') && requestDetails.url.includes('yastatic.net')) {
return false;
}
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// Only requests of type GET can be valid candidates.
return requestDetails.method === WebRequest.GET;
};
requestAnalyzer.getLocalTarget = function (requestDetails) {
let destinationUrl, destinationHost, destinationPath, hostMappings, basePath, resourceMappings;
let destinationSearchString = '';
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destinationUrl = new URL(requestDetails.url);
destinationHost = destinationUrl.host;
destinationPath = destinationUrl.pathname;
if (destinationUrl.search) {
destinationSearchString = destinationUrl.search;
}
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// Use the proper mappings for the targeted host.
hostMappings = mappings[destinationHost];
// Resource mapping files are never locally available.
if (Resource.MAPPING_EXPRESSION.test(destinationPath)) {
return false;
}
basePath = requestAnalyzer._matchBasePath(hostMappings, destinationPath);
resourceMappings = hostMappings[basePath];
if (!resourceMappings) {
return false;
}
// Return either the local target's path or false.
return requestAnalyzer._findLocalTarget(resourceMappings, basePath, destinationHost, destinationPath, destinationSearchString);
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};
/**
* Private Methods
*/
requestAnalyzer._matchBasePath = function (hostMappings, channelPath) {
for (let basePath of Object.keys(hostMappings)) {
if (channelPath.startsWith(basePath)) {
return basePath;
}
}
return false;
};
requestAnalyzer._findLocalTarget = function (resourceMappings, basePath, channelHost, channelPath, destinationSearchString) {
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let resourcePath, versionNumber, resourcePattern, filename, shorthandResource;
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storageManager.type.get(Setting.LOGGING, function (items) {
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requestAnalyzer.logging = items.enableLogging;
});
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resourcePath = channelPath.replace(basePath, '');
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versionNumber = resourcePath.match(Resource.VERSION_EXPRESSION);
resourcePattern = resourcePath.replace(versionNumber, Resource.VERSION_PLACEHOLDER);
shorthandResource = shorthands.specialFiles(channelHost, channelPath, destinationSearchString);
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if (shorthandResource) {
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if (requestAnalyzer.logging) {
console.log('[ LocalCDN ] Replaced resource: ' + shorthandResource.path);
}
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return shorthandResource;
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}
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for (let resourceMold of Object.keys(resourceMappings)) {
if (resourcePattern.startsWith(resourceMold)) {
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let targetPath, versionDelivered, versionRequested;
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targetPath = resourceMappings[resourceMold].path;
targetPath = targetPath.replace(Resource.VERSION_PLACEHOLDER, versionNumber);
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// Replace the requested version with the latest depending on major version
versionDelivered = helpers.setLastVersion(targetPath, versionNumber).toString();
targetPath = targetPath.replace(versionNumber, versionDelivered);
versionRequested = versionNumber === null ? 'latest' : versionNumber[0];
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if (versionNumber === null) {
versionDelivered = targetPath.match(Resource.VERSION_EXPRESSION).toString();
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}
// Get bundle name
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let bundle = helpers.determineBundle(channelPath);
if (bundle !== '') {
filename = channelPath.split('/').pop();
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targetPath = ( RegExp('.*\.css$').test(filename) ) ? targetPath + filename : targetPath + filename + 'm';
}
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if (requestAnalyzer.logging) {
console.log('[ LocalCDN ] Replaced resource: ' + targetPath);
}
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// Prepare and return a local target.
return {
'source': channelHost,
'versionRequested': versionRequested,
'versionDelivered': versionDelivered,
'path': targetPath,
'bundle': bundle
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};
}
}
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if (requestAnalyzer.logging) {
console.warn('[ LocalCDN ] Missing resource: ' + channelHost + channelPath);
}
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return false;
};
requestAnalyzer._applyWhitelistedDomains = function () {
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storageManager.type.get(Setting.WHITELISTED_DOMAINS, function (items) {
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requestAnalyzer.whitelistedDomains = items.whitelistedDomains || {};
});
};
requestAnalyzer._applyManipulateDOMDomains = function () {
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storageManager.type.get(Setting.DOMAINS_MANIPULATE_DOM, function (items) {
requestAnalyzer.domainsManipulateDOM = items.domainsManipulateDOM || {};
});
};
requestAnalyzer._applyAllowedDomainsGoogleFonts = function () {
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storageManager.type.get(Setting.ALLOWED_DOMAINS_GOOGLE_FONTS, function (items) {
requestAnalyzer.domainsGoogleFonts = items.allowedDomainsGoogleFonts || {};
});
};
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/**
* Initializations
*/
requestAnalyzer.whitelistedDomains = {};
requestAnalyzer._applyWhitelistedDomains();
requestAnalyzer.domainsManipulateDOM = {};
requestAnalyzer._applyManipulateDOMDomains();
requestAnalyzer.domainsGoogleFonts = {};
requestAnalyzer._applyAllowedDomainsGoogleFonts();
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/**
* Event Handlers
*/
chrome.storage.onChanged.addListener(requestAnalyzer._applyWhitelistedDomains);
chrome.storage.onChanged.addListener(requestAnalyzer._applyManipulateDOMDomains);
chrome.storage.onChanged.addListener(requestAnalyzer._applyAllowedDomainsGoogleFonts);