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/**
* GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
* *
* Copyright (C) 2011, 2012, 2013, 2014 Loic J. Duros
* Copyright (C) 2014, 2015 Nik Nyby
*
* This file is part of GNU LibreJS.
*
* GNU LibreJS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNU LibreJS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU LibreJS. If not, see <http://www.gnu.org/licenses/>.
*/
var relationChecker = require("js_checker/relation_checker").relationChecker;
var crypto = require('script_entries/crypto');
const checkTypes = require("js_checker/constant_types").checkTypes;
// cachedResults contains objects with result/relationChecker for
// scripts entries indexed by SHA1sum
var cachedResults = {};
/**
* ScriptsCached keeps a cache of whitelisted scripts in the browser
* session.
*/
var ScriptsCached = function() {
};
ScriptsCached.prototype.getHash = function(scriptText) {
require('ui/notification').createNotification(scriptText.substring(0,100));
return crypto.sha1Encrypt(scriptText);
};
/**
* resetCache
* Resets the full cache and re-initialize
* the free libraries list.
*/
ScriptsCached.prototype.resetCache = function () {
cachedResults = {};
// import free_libraries to populate the cache hash map.
var free_libraries = require("script_entries/free_libraries");
free_libraries.init();
};
/**
*
* addEntry
*
* Adds a script entry to the cache by providing the results
* and the actual script text.
*
*/
ScriptsCached.prototype.addEntry = function(
scriptText, result, relationCheckerObj, allowTrivial, url
) {
console.debug("result addEntry is", JSON.stringify(result));
cachedResults[this.getHash(scriptText)] = {
'result': result,
'relationChecker': relationChecker(),
'allowTrivial': allowTrivial,
'url': url
};
};
/**
*
* addEntry
*
* Adds a script entry to the cache by providing the results
* using the script's hash.
*
*/
ScriptsCached.prototype.addEntryByHash = function(
hash, result, relationChecker, allowTrivial, url) {
cachedResults[hash] = {
'result': result,
'relationChecker': relationCheckerObj(),
'allowTrivial': allowTrivial,
'url': url || ''
};
};
/**
* removeEntryByHash
*
* Remove an entry from the cache using hash key.
*/
ScriptsCached.prototype.removeEntryByHash = function(hash) {
delete cachedResults[hash];
};
/**
* addEntryIfNotCached
*
* Checks first if entry is cached before attempting to cache result.
*/
ScriptsCached.prototype.addEntryIfNotCached = function(
scriptText, result, relationChecker, allowTrivial, url) {
// save a bit of computing by getting hash once.
var hash = this.getHash(scriptText);
console.debug('hash is then', hash);
if (!this.isCached(scriptText, hash)) {
cachedResults[hash] = {
'result': result,
'relationChecker': relationCheckerObj(),
'allowTrivial': allowTrivial,
'url': url || ''
};
}
return hash;
};
/**
*
* addObjectEntry
*
* Adds a script entry by providing an object.
* Used to provide free library hashes from free_libraries.js
*
*/
ScriptsCached.prototype.addObjectEntry = function(hash, script) {
cachedResults[hash] = script;
};
ScriptsCached.prototype.isCached = function(scriptText, hash) {
var scriptHash;
console.debug("Is CACHED start?");
try {
if (typeof hash === 'string') {
scriptHash = hash;
} else {
scriptHash = this.getHash(scriptText);
}
if (typeof scriptHash === 'string') {
let cachedResult = cachedResults[scriptHash];
if (cachedResult) {
// exact copy of file has already been cached.
console.debug('scriptHash is', cachedResult);
if (cachedResult.relationChecker == "[rl]") {
cachedResult.relationChecker = {}; //relationCheckerObj();
}
console.debug("Is Cached ENd TRUE");
return cachedResult;
}
}
return false;
} catch (e) {
console.debug("an error", scriptHash, e, e.linenumber, e.filename);
}
};
/**
* Writes allowed scripts to the cache.
* nonfree/nontrivial scripts are not added to the cache.
*/
ScriptsCached.prototype.getCacheForWriting = function() {
var formattedResults = {};
for (let item in cachedResults) {
let type = cachedResults[item].result.type;
if (type != checkTypes.NONTRIVIAL &&
type != checkTypes.TRIVIAL_DEFINES_FUNCTION
) {
formattedResults[item] = cachedResults[item];
}
}
return formattedResults;
};
/**
* Import data from database into cachedResults.
* Calling this function replaces the current cache if it exists.
*/
ScriptsCached.prototype.bulkImportCache = function(data) {
cachedResults = data;
console.debug("Imported data. Number of keys ISSS ",
Object.keys(cachedResults).length);
console.debug("It looks like ", JSON.stringify(cachedResults));
};
exports.scriptsCached = new ScriptsCached();
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