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/*
* NoScript Commons Library
* Reusable building blocks for cross-browser security/privacy WebExtensions.
* Copyright (C) 2020-2024 Giorgio Maone <https://maone.net>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
* This program 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.
*
* This program 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
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
var CachedStorage = (() => {
const scopes = new WeakMap();
const DEFER_DELAY = 1000;
let deferredTasks = null;
const performTasks = async () => {
for (let t of deferredTasks) t();
deferredTasks = null;
};
const deferTasks = (...tasks) => {
if (!deferredTasks) {
deferredTasks = tasks;
setTimeout(performTasks, DEFER_DELAY);
} else {
deferredTasks.push(...tasks);
}
};
const addNameSpace = (nameSpace, properties, keys) => {
const prefix = nameSpace ? `${nameSpace}.` : "";
const nameSpacedProps = {};
for (const key of keys) {
nameSpacedProps[`${prefix}${key}`] = properties[key];
}
return nameSpacedProps;
};
const removeNameSpace = (nameSpace, properties) => {
if (!nameSpace) return properties;
const len = nameSpace.length + 1;
const props = {};
for (const [key, val] of Object.entries(properties)) {
props[key.substring(len)] = val;
}
return props;
};
return {
async init(
properties = null,
nameSpace = "",
scope = null,
storageType = "session"
) {
if (!properties) {
console.warn("CachedStorage.init(): no properties!");
return null;
}
scope ??= (nameSpace && globalThis[nameSpace]) || globalThis;
for (let p in properties) {
if (p in scope) {
// already initialized
return scope;
}
break;
}
if (!(storageType in browser.storage)) {
console.warn(
`CachedStorage.init(): no browser.storage.${storageType}, falling back to vanilla properties`
);
return Object.assign(scope, properties);
}
const keys = Object.keys(properties);
if (nameSpace) {
properties = addNameSpace(nameSpace, properties, keys);
} else {
nameSpace = "";
}
let metadata = scopes.get(scope);
if (!metadata) {
scopes.set(scope, (metadata = { storage: {} }));
}
const ns = (metadata.storage[storageType] ??= new Map()).get(nameSpace);
if (ns) {
for (const key of keys) ns.add(key);
} else {
metadata.storage[storageType].set(nameSpace, new Set(keys));
}
return Object.assign(
scope,
removeNameSpace(
nameSpace,
await browser.storage[storageType].get(properties)
)
);
},
async save(scope = globalThis, defer = false) {
const metadata = scopes.get(scope);
if (!metadata) {
console.warn(
`CacheStorage.save(): metadata not found for scope ${scope}!`
);
return false;
}
if (metadata.deferredSave) return;
if ((defer ||= Date.now() - metadata.lastSaved < 20)) {
metadata.deferredSave = true;
return Promise.resolve(
deferTasks(() => {
metadata.deferredSave = false;
this.save(scope);
})
);
}
const savingTasks = [];
for (const [storageType, ns] of Object.entries(metadata.storage)) {
for (const [nameSpace, keys] of ns.entries()) {
const properties = addNameSpace(nameSpace, scope, keys);
savingTasks.push(browser.storage[storageType].set(properties));
}
}
metadata.lastSaved = Date.now();
return await Promise.allSettled(savingTasks);
},
};
})();
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