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// We should not rely on local storage in an extension!
// We should use this instead!
// https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/storage/local
const extension = require('extensionizer')
const log = require('loglevel')
module.exports = class ExtensionStore {
constructor() {
this.isSupported = !!(extension.storage.local)
if (!this.isSupported) {
log.error('Storage local API not available.')
}
}
async get() {
if (!this.isSupported) return undefined
const result = await this._get()
// extension.storage.local always returns an obj
// if the object is empty, treat it as undefined
if (isEmpty(result)) {
return undefined
} else {
return result
}
}
async set(state) {
return this._set(state)
}
_get() {
const local = extension.storage.local
return new Promise((resolve, reject) => {
local.get(null, (result) => {
const err = extension.runtime.lastError
if (err) {
reject(err)
} else {
resolve(result)
}
})
})
}
_set(obj) {
const local = extension.storage.local
return new Promise((resolve, reject) => {
local.set(obj, () => {
const err = extension.runtime.lastError
if (err) {
reject(err)
} else {
resolve()
}
})
})
}
}
function isEmpty(obj) {
return Object.keys(obj).length === 0
}
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