135 lines
3.7 KiB
JavaScript
135 lines
3.7 KiB
JavaScript
const pipe = require('pump')
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const StreamProvider = require('web3-stream-provider')
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const LocalStorageStore = require('obs-store')
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const ObjectMultiplex = require('./obj-multiplex')
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const createRandomId = require('./random-id')
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module.exports = MetamaskInpageProvider
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function MetamaskInpageProvider (connectionStream) {
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const self = this
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// setup connectionStream multiplexing
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var multiStream = self.multiStream = ObjectMultiplex()
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pipe(
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connectionStream,
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multiStream,
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connectionStream,
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(err) => logStreamDisconnectWarning('MetaMask', err)
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)
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// subscribe to metamask public config (one-way)
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self.publicConfigStore = new LocalStorageStore({ storageKey: 'MetaMask-Config' })
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pipe(
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multiStream.createStream('publicConfig'),
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self.publicConfigStore,
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(err) => logStreamDisconnectWarning('MetaMask PublicConfigStore', err)
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)
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// connect to async provider
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const asyncProvider = self.asyncProvider = new StreamProvider()
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pipe(
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asyncProvider,
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multiStream.createStream('provider'),
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asyncProvider,
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(err) => logStreamDisconnectWarning('MetaMask RpcProvider', err)
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)
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self.idMap = {}
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// handle sendAsync requests via asyncProvider
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self.sendAsync = function (payload, cb) {
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// rewrite request ids
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var request = eachJsonMessage(payload, (message) => {
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var newId = createRandomId()
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self.idMap[newId] = message.id
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message.id = newId
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return message
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})
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// forward to asyncProvider
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asyncProvider.sendAsync(request, function (err, res) {
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if (err) return cb(err)
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// transform messages to original ids
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eachJsonMessage(res, (message) => {
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var oldId = self.idMap[message.id]
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delete self.idMap[message.id]
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message.id = oldId
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return message
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})
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cb(null, res)
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})
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}
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}
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MetamaskInpageProvider.prototype.send = function (payload) {
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const self = this
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let selectedAddress
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let result = null
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switch (payload.method) {
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case 'eth_accounts':
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// read from localStorage
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selectedAddress = self.publicConfigStore.getState().selectedAddress
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result = selectedAddress ? [selectedAddress] : []
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break
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case 'eth_coinbase':
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// read from localStorage
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selectedAddress = self.publicConfigStore.getState().selectedAddress
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result = selectedAddress
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break
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case 'eth_uninstallFilter':
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self.sendAsync(payload, noop)
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result = true
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break
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case 'net_version':
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let networkVersion = self.publicConfigStore.getState().networkVersion
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result = networkVersion
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break
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// throw not-supported Error
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default:
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var link = 'https://github.com/MetaMask/faq/blob/master/DEVELOPERS.md#dizzy-all-async---think-of-metamask-as-a-light-client'
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var message = `The MetaMask Web3 object does not support synchronous methods like ${payload.method} without a callback parameter. See ${link} for details.`
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throw new Error(message)
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}
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// return the result
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return {
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id: payload.id,
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jsonrpc: payload.jsonrpc,
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result: result,
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}
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}
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MetamaskInpageProvider.prototype.sendAsync = function () {
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throw new Error('MetamaskInpageProvider - sendAsync not overwritten')
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}
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MetamaskInpageProvider.prototype.isConnected = function () {
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return true
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}
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MetamaskInpageProvider.prototype.isMetaMask = true
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// util
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function eachJsonMessage (payload, transformFn) {
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if (Array.isArray(payload)) {
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return payload.map(transformFn)
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} else {
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return transformFn(payload)
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}
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}
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function logStreamDisconnectWarning(remoteLabel, err){
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let warningMsg = `MetamaskInpageProvider - lost connection to ${remoteLabel}`
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if (err) warningMsg += '\n' + err.stack
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console.warn(warningMsg)
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}
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function noop () {}
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