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/**
* GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
*
* Copyright (C) 2018 Giorgio Maone <giorgio@maone.net>
*
* 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/>.
*/
/**
A tiny wrapper around extensions storage API, supporting CSV serialization for
retro-compatibility
*/
'use strict';
const jssha = require('jssha');
const Storage = {
ARRAY: {
async load(key, array = undefined) {
const result = array === undefined ?
(await browser.storage.local.get(key))[key] : array;
return result ? new Set(result) : new Set();
},
async save(key, list) {
return await browser.storage.local.set({ [key]: [...list] });
},
},
CSV: {
async load(key) {
const csv = (await browser.storage.local.get(key))[key];
return csv ? new Set(csv.split(/\s*,\s*/)) : new Set();
},
async save(key, list) {
return await browser.storage.local.set({ [key]: [...list].join(',') });
}
}
};
/**
A class to hold and persist blacklists and whitelists
*/
class ListStore {
constructor(key, storage = Storage.ARRAY) {
this.key = key;
this.storage = storage;
this.items = new Set();
browser.storage.onChanged.addListener(changes => {
if (!this.saving && this.key in changes) {
this.load(changes[this.key].newValue);
}
});
}
static inlineItem(url) {
// here we simplify and hash inline script references
return url.startsWith('inline:') ? url
: url.startsWith('view-source:')
&& url.replace(/^view-source:[\w-+]+:\/+([^/]+).*#line\d+/, 'inline://$1#')
.replace(/\n[^]*/, s => s.replace(/\s+/g, ' ').substring(0, 16) + '…' + hash(s.trim()));
}
static hashItem(hash) {
return hash.startsWith('(') ? hash : `(${hash})`;
}
static urlItem(url) {
const queryPos = url.indexOf('?');
return queryPos === -1 ? url : url.substring(0, queryPos);
}
static siteItem(url) {
if (url.endsWith('/*')) return url;
try {
return `${new URL(url).origin}/*`;
} catch (e) {
return `${url}/*`;
}
}
async save() {
this._saving = true;
try {
return await this.storage.save(this.key, this.items);
} finally {
this._saving = false;
}
}
async load(values = undefined) {
try {
this.items = await this.storage.load(this.key, values);
} catch (e) {
console.error(e);
}
return this.items;
}
async store(...items) {
const size = this.items.size;
const changed = items.reduce((current, item) => size !== this.items.add(item).size || current, false);
changed && await this.save();
}
async remove(...items) {
const changed = items.reduce((current, item) => this.items.delete(item) || current, false);
changed && await this.save();
}
contains(item) {
return this.items.has(item);
}
}
function hash(source) {
const shaObj = new jssha('SHA-256', 'TEXT')
shaObj.update(source);
return shaObj.getHash('HEX');
}
if (typeof module === 'object') {
module.exports = { ListStore, Storage, hash };
}
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