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

192 lines
5.6 KiB
JavaScript

/**
* Request Analyzer
* Belongs to Decentraleyes.
*
* @author Thomas Rientjes
* @since 2016-04-11
* @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;
initiatorDomain = helpers.extractDomainFromUrl(tabDetails.url, true);
if (initiatorDomain === null) {
initiatorDomain = Address.EXAMPLE;
}
isWhitelisted = requestAnalyzer.whitelistedDomains[initiatorDomain];
if (isWhitelisted) {
return false;
}
// 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;
destinationUrl = new URL(requestDetails.url);
destinationHost = destinationUrl.host;
destinationPath = destinationUrl.pathname;
// 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);
};
/**
* 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) {
let resourcePath, versionNumber, resourcePattern, filename;
chrome.storage.local.get(Setting.LOGGING, function (items) {
requestAnalyzer.logging = items.enableLogging;
});
resourcePath = channelPath.replace(basePath, '');
versionNumber = resourcePath.match(Resource.VERSION_EXPRESSION);
resourcePattern = resourcePath.replace(versionNumber, Resource.VERSION_PLACEHOLDER);
/*
NOTE:
jsDelivr allows to load several files in one request
This is just a workaround. If there are more websites which use this, we will have to do crazy things here to find and redirect these files.
It's not possible to respond to a request with multiple redirections
https://gitlab.com/nobody42/localcdn/-/issues/45
*/
let regexJsDelivr = RegExp(/\/combine.*jquery.*hogan.*algoliasearch.*autocomplete.*/);
if (channelHost.includes('cdn.jsdelivr.net') && regexJsDelivr.test(channelPath)) {
return {
'source': channelHost,
'version': 'beta',
'path': 'resources/jsdelivr-combine-jquery-hogan-algoliasearch-autocomplete.jsm',
'bundle': ''
};
}
for (let resourceMold of Object.keys(resourceMappings)) {
if (resourcePattern.startsWith(resourceMold)) {
let targetPath, hostShorthands, version;
targetPath = resourceMappings[resourceMold].path;
targetPath = targetPath.replace(Resource.VERSION_PLACEHOLDER, versionNumber);
// Replace the requested version with the latest depending on major version
version = helpers.setLastVersion(targetPath, versionNumber).toString();
targetPath = targetPath.replace(versionNumber, version);
hostShorthands = shorthands[channelHost];
if (hostShorthands && hostShorthands[targetPath]) {
let shorthand = hostShorthands[targetPath];
targetPath = shorthand.path;
version = shorthand.version;
} else {
version = versionNumber && versionNumber[0] || targetPath.match(Resource.VERSION_EXPRESSION);
}
// Get bundle name
let bundle = helpers.determineBundle(channelPath);
if(bundle !== '') {
filename = channelPath.split('/').pop();
targetPath = ( RegExp('.*\.css$').test(filename) ) ? targetPath + filename : targetPath + filename + 'm';
}
if (requestAnalyzer.logging) {
console.log('[ LocalCDN ] Replaced resource: ' + targetPath);
}
// Prepare and return a local target.
return {
'source': channelHost,
'version': version,
'path': targetPath,
'bundle': bundle
};
}
}
if (requestAnalyzer.logging) {
console.warn('[ LocalCDN ] Missing resource: ' + channelHost + channelPath);
}
return false;
};
requestAnalyzer._applyWhitelistedDomains = function () {
chrome.storage.local.get(Setting.WHITELISTED_DOMAINS, function (items) {
requestAnalyzer.whitelistedDomains = items.whitelistedDomains || {};
});
};
/**
* Initializations
*/
requestAnalyzer.whitelistedDomains = {};
requestAnalyzer._applyWhitelistedDomains();
/**
* Event Handlers
*/
chrome.storage.onChanged.addListener(requestAnalyzer._applyWhitelistedDomains);