const Migrator = require('pojo-migrator') const extend = require('xtend') const STORAGE_KEY = 'metamask-config' const DEFAULT_RPC = 'https://testrpc.metamask.io/' const migrations = require('./migrations') /* The config-manager is a convenience object * wrapping a pojo-migrator. * * It exists mostly to allow the creation of * convenience methods to access and persist * particular portions of the state. */ module.exports = ConfigManager function ConfigManager() { // ConfigManager is observable and will emit updates this._subs = [] /* The migrator exported on the config-manager * has two methods the user should be concerned with: * * getData(), which returns the app-consumable data object * saveData(), which persists the app-consumable data object. */ this.migrator = new Migrator({ // Migrations must start at version 1 or later. // They are objects with a `version` number // and a `migrate` function. // // The `migrate` function receives the previous // config data format, and returns the new one. migrations: migrations, // How to load initial config. // Includes step on migrating pre-pojo-migrator data. loadData: loadData, // How to persist migrated config. setData: function(data) { window.localStorage[STORAGE_KEY] = JSON.stringify(data) }, }) } ConfigManager.prototype.setConfig = function(config) { var data = this.migrator.getData() data.config = config this.setData(data) this._emitUpdates(config) } ConfigManager.prototype.getConfig = function() { var data = this.migrator.getData() if ('config' in data) { return data.config } else { return { provider: { type: 'rpc', rpcTarget: DEFAULT_RPC, } } } } ConfigManager.prototype.setRpcTarget = function(rpcUrl) { var config = this.getConfig() config.provider = { type: 'rpc', rpcTarget: rpcUrl, } this.setConfig(config) } ConfigManager.prototype.useEtherscanProvider = function() { var config = this.getConfig() config.provider = { type: 'etherscan', } this.setConfig(config) } ConfigManager.prototype.getProvider = function() { var config = this.getConfig() return config.provider } ConfigManager.prototype.setData = function(data) { this.migrator.saveData(data) } ConfigManager.prototype.getData = function() { return this.migrator.getData() } ConfigManager.prototype.setWallet = function(wallet) { var data = this.migrator.getData() data.wallet = wallet this.setData(data) } ConfigManager.prototype.getWallet = function() { return this.migrator.getData().wallet } // Takes a boolean ConfigManager.prototype.setShowSeedWords = function(should) { var data = this.migrator.getData() data.showSeedWords = should this.setData(data) } ConfigManager.prototype.getShouldShowSeedWords = function() { var data = this.migrator.getData() return data.showSeedWords } ConfigManager.prototype.getCurrentRpcAddress = function() { var config = this.getConfig() if (!config) return null return config.provider && config.provider.rpcTarget ? config.provider.rpcTarget : DEFAULT_RPC } ConfigManager.prototype.clearWallet = function() { var data = this.getConfig() delete data.wallet this.setData(data) } ConfigManager.prototype.setData = function(data) { this.migrator.saveData(data) } // observable ConfigManager.prototype.subscribe = function(fn){ this._subs.push(fn) var unsubscribe = this.unsubscribe.bind(this, fn) return unsubscribe } ConfigManager.prototype.unsubscribe = function(fn){ var index = this._subs.indexOf(fn) if (index !== -1) this._subs.splice(index, 1) } ConfigManager.prototype._emitUpdates = function(state){ this._subs.forEach(function(handler){ handler(state) }) } function loadData() { var oldData = getOldStyleData() var newData try { newData = JSON.parse(window.localStorage[STORAGE_KEY]) } catch (e) {} var data = extend({ meta: { version: 0, }, data: { config: { rpcTarget: DEFAULT_RPC, } } }, oldData ? oldData : null, newData ? newData : null) return data } function getOldStyleData() { var config, wallet, seedWords var result = { meta: { version: 0 }, data: {}, } try { config = JSON.parse(window.localStorage['config']) result.data.config = config } catch (e) {} try { wallet = JSON.parse(window.localStorage['lightwallet']) result.data.wallet = wallet } catch (e) {} try { seedWords = window.localStorage['seedWords'] result.data.seedWords = seedWords } catch (e) {} return result }