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/**
* 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 = {};
/**
* Constants
*/
const MAPPING_FILE_EXPRESSION = new RegExp('\.map$', 'i');
const VERSION_EXPRESSION = /(?:\d{1,2}\.){1,3}\d{1,2}/;
const VERSION_PLACEHOLDER = '{version}';
const WEB_DOMAIN_EXPRESSION = /:\/\/(.[^\/]+)(.*)/;
const WEB_PREFIX_VALUE = 'www.';
const WEB_PREFIX_LENGTH = WEB_PREFIX_VALUE.length;
/**
* Public Methods
*/
requestAnalyzer.isValidCandidate = function (requestDetails, tabDetails) {
let initiatorHost;
try {
initiatorHost = tabDetails.url.match(WEB_DOMAIN_EXPRESSION)[1];
} catch (exception) {
initiatorHost = 'example.org';
}
if (initiatorHost && requestAnalyzer.whitelistedDomains[requestAnalyzer._normalizeDomain(initiatorHost)]) {
return false;
}
// Only requests of type GET can be valid candidates.
return requestDetails.method === 'GET';
};
requestAnalyzer.getLocalTarget = function (requestDetails) {
let destinationHost, destinationPath, hostMappings, basePath, resourceMappings;
destinationHost = requestDetails.url.match(WEB_DOMAIN_EXPRESSION)[1];
destinationPath = requestDetails.url.match(WEB_DOMAIN_EXPRESSION)[2];
// Use the proper mappings for the targeted host.
hostMappings = mappings[destinationHost];
// Resource mapping files are never locally available.
if (MAPPING_FILE_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) {
var resourcePath, versionNumber, resourcePattern;
resourcePath = channelPath.replace(basePath, '');
versionNumber = resourcePath.match(VERSION_EXPRESSION);
resourcePattern = resourcePath.replace(versionNumber, VERSION_PLACEHOLDER);
for (let resourceMold of Object.keys(resourceMappings)) {
if (resourcePattern.startsWith(resourceMold)) {
let targetPath, version;
targetPath = resourceMappings[resourceMold].path;
targetPath = targetPath.replace(VERSION_PLACEHOLDER, versionNumber);
version = versionNumber && versionNumber[0] || targetPath.match(VERSION_EXPRESSION);
// Prepare and return a local target.
return {
source: channelHost,
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path: targetPath
};
}
}
return false;
};
requestAnalyzer._applyWhitelistedDomains = function () {
//noinspection JSUnresolvedVariable
chrome.storage.local.get('whitelistedDomains', function (items) {
requestAnalyzer.whitelistedDomains = items.whitelistedDomains || {};
});
};
requestAnalyzer._normalizeDomain = function (domain) {
domain = domain.toLowerCase().trim();
if (domain.startsWith(WEB_PREFIX_VALUE)) {
domain = domain.slice(WEB_PREFIX_LENGTH);
}
return domain;
};
/**
* Initializations
*/
requestAnalyzer.whitelistedDomains = {};
requestAnalyzer._applyWhitelistedDomains();
/**
* Event Handlers
*/
chrome.storage.onChanged.addListener(requestAnalyzer._applyWhitelistedDomains);