mirror of
https://github.com/kremalicious/metamask-extension.git
synced 2024-12-23 09:52:26 +01:00
130 lines
4.0 KiB
JavaScript
130 lines
4.0 KiB
JavaScript
const Streams = require('mississippi')
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const StreamProvider = require('web3-stream-provider')
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const ObjectMultiplex = require('./obj-multiplex')
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const RemoteStore = require('./remote-store.js').RemoteStore
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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 = ObjectMultiplex()
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Streams.pipe(connectionStream, multiStream, connectionStream, function (err) {
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let warningMsg = 'MetamaskInpageProvider - lost connection to MetaMask'
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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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self.multiStream = multiStream
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// subscribe to metamask public config
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var publicConfigStore = remoteStoreWithLocalStorageCache('MetaMask-Config')
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var storeStream = publicConfigStore.createStream()
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Streams.pipe(storeStream, multiStream.createStream('publicConfig'), storeStream, function (err) {
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let warningMsg = 'MetamaskInpageProvider - lost connection to MetaMask publicConfig'
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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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self.publicConfigStore = publicConfigStore
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// connect to async provider
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var asyncProvider = new StreamProvider()
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Streams.pipe(asyncProvider, multiStream.createStream('provider'), asyncProvider, function (err) {
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let warningMsg = 'MetamaskInpageProvider - lost connection to MetaMask provider'
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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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asyncProvider.on('error', console.error.bind(console))
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self.asyncProvider = asyncProvider
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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 selectedAccount
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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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selectedAccount = self.publicConfigStore.get('selectedAddress')
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result = selectedAccount ? [selectedAccount] : []
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break
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case 'eth_coinbase':
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// read from localStorage
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selectedAccount = self.publicConfigStore.get('selectedAddress')
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result = selectedAccount || '0x0000000000000000000000000000000000000000'
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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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// util
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function remoteStoreWithLocalStorageCache (storageKey) {
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// read local cache
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var initState = JSON.parse(localStorage[storageKey] || '{}')
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var store = new RemoteStore(initState)
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// cache the latest state locally
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store.subscribe(function (state) {
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localStorage[storageKey] = JSON.stringify(state)
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})
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return store
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}
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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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