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-rw-r--r--bg/Storage.js79
1 files changed, 79 insertions, 0 deletions
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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
+*/
+
+var Storage = {
+ ARRAY: {
+ async load(key) {
+ let array = (await browser.storage.local.get(key))[key];
+ return array ? new Set(array) : new Set();
+ },
+ async save(key, list) {
+ return await browser.storage.local.set({[key]: [...list]});
+ },
+ },
+
+ CSV: {
+ async load(key) {
+ let 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();
+ }
+
+ async save() {
+ return await this.storage.save(this.key, this.items);
+ }
+
+ async load() {
+ return await this.storage.load(this.key);
+ }
+
+ async store(item) {
+ let size = this.items.size;
+ return (size !== this.items.add(item).size) && await this.save();
+ }
+
+ async remove(item) {
+ return this.items.delete(item) && await this.save();
+ }
+}
+
+module.exports = { ListStore, Storage };