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110 lines
2.4 KiB
110 lines
2.4 KiB
const extension = require('extensionizer')
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const log = require('loglevel')
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/**
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* A wrapper around the extension's storage local API
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*/
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module.exports = class ExtensionStore {
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/**
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* @constructor
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*/
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constructor () {
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this.isSupported = !!(extension.storage.local)
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if (!this.isSupported) {
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log.error('Storage local API not available.')
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}
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}
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/**
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* Returns all of the keys currently saved
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* @return {Promise<*>}
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*/
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async get () {
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if (!this.isSupported) {
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return undefined
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}
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const result = await this._get()
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// extension.storage.local always returns an obj
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// if the object is empty, treat it as undefined
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if (isEmpty(result)) {
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return undefined
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} else {
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return result
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}
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}
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/**
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* Sets the key in local state
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* @param {object} state - The state to set
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* @return {Promise<void>}
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*/
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async set (state) {
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return this._set(state)
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}
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/**
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* Returns all of the keys currently saved
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* @private
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* @return {object} the key-value map from local storage
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*/
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_get () {
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const local = extension.storage.local
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return new Promise((resolve, reject) => {
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local.get(null, (/** @type {any} */ result) => {
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const err = checkForError()
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if (err) {
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reject(err)
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} else {
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resolve(result)
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}
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})
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})
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}
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/**
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* Sets the key in local state
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* @param {object} obj - The key to set
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* @return {Promise<void>}
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* @private
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*/
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_set (obj) {
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const local = extension.storage.local
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return new Promise((resolve, reject) => {
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local.set(obj, () => {
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const err = checkForError()
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if (err) {
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reject(err)
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} else {
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resolve()
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}
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})
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})
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}
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}
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/**
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* Returns whether or not the given object contains no keys
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* @param {object} obj - The object to check
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* @returns {boolean}
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*/
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function isEmpty (obj) {
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return Object.keys(obj).length === 0
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}
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/**
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* Returns an Error if extension.runtime.lastError is present
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* this is a workaround for the non-standard error object thats used
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* @returns {Error}
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*/
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function checkForError () {
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const lastError = extension.runtime.lastError
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if (!lastError) {
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return
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}
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// if it quacks like an Error, its an Error
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if (lastError.stack && lastError.message) {
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return lastError
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}
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// repair incomplete error object (eg chromium v77)
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return new Error(lastError.message)
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}
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