132 lines
4.0 KiB
JavaScript
132 lines
4.0 KiB
JavaScript
const HttpProvider = require('web3/lib/web3/httpprovider')
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const Streams = require('mississippi')
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const ObjectMultiplex = require('./obj-multiplex')
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const StreamProvider = require('web3-stream-provider')
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const RemoteStore = require('./remote-store.js').RemoteStore
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const MetamaskConfig = require('../config.js')
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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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console.warn('MetamaskInpageProvider - lost connection to MetaMask')
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if (err) throw err
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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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console.warn('MetamaskInpageProvider - lost connection to MetaMask publicConfig')
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if (err) throw err
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})
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self.publicConfigStore = publicConfigStore
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// connect to sync provider
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self.syncProvider = createSyncProvider(publicConfigStore.get('provider'))
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// subscribe to publicConfig to update the syncProvider on change
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publicConfigStore.subscribe(function (state) {
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self.syncProvider = createSyncProvider(state.provider)
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})
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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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console.warn('MetamaskInpageProvider - lost connection to MetaMask provider')
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if (err) throw err
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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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// overwrite own sendAsync method
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self.sendAsync = asyncProvider.sendAsync.bind(asyncProvider)
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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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var 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.get('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.get('selectedAddress')
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result = selectedAddress || '0x0000000000000000000000000000000000000000'
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break
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// fallback to normal rpc
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default:
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return self.syncProvider.send(payload)
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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 createSyncProvider (providerConfig) {
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providerConfig = providerConfig || {}
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let syncProviderUrl
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if (providerConfig.rpcTarget) {
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syncProviderUrl = providerConfig.rpcTarget
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} else {
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switch (providerConfig.type) {
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case 'testnet':
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syncProviderUrl = MetamaskConfig.network.testnet
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break
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case 'mainnet':
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syncProviderUrl = MetamaskConfig.network.mainnet
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break
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default:
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syncProviderUrl = MetamaskConfig.network.default
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}
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}
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const provider = new HttpProvider(syncProviderUrl)
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// Stubbing out the send method to throw on sync methods:
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provider.send = function() {
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var message = 'The MetaMask Web3 object does not support synchronous methods. See https://github.com/MetaMask/faq#all-async---think-of-metamask-as-a-light-client for details.'
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throw new Error(message)
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}
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return provider
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}
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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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