rpc - sync - add support for sync eth_accounts + eth_coinbase

app/scripts/inpage.js

@@ -1,4 +1,5 @@
 const Web3 = require('web3')
+const createPayload = require('web3-provider-engine/util/create-payload')
 const StreamProvider = require('./lib/stream-provider.js')
 const LocalMessageDuplexStream = require('./lib/local-message-stream.js')
 
@@ -12,21 +13,57 @@ var remoteProvider = new StreamProvider()
 remoteProvider.pipe(pluginStream).pipe(remoteProvider)
 
 // handle synchronous methods remotely
-var syncProvider = new Web3.providers.HttpProvider('https://rawtestrpc.metamask.io/')
-var unsupportedMethods = ['eth_accounts']
-remoteProvider.send = function(payload){
 
-  var payloads = Array.isArray(payload) ? payload : [payload]
-  payloads.forEach(function(payload){
-    if (-1 !== unsupportedMethods.indexOf(payload.method)) {
-      console.error('MetaMask - Unsupported synchronous call "'+payload.method+'".')
+// handle accounts cache
+var accountsCache = []
+setInterval(populateAccountsCache, 1000)
+function populateAccountsCache(){
+  remoteProvider.sendAsync(createPayload({
+    method: 'eth_accounts',
+    params: [],
+    note: 'from metamask inpage provider',
+  }), function(err, response){
+    if (err) return console.error('MetaMask - Error polling accounts')
+    // update localStorage
+    var accounts = response.result
+    if (accounts.toString() !== accountsCache.toString()) {
+      accountsCache = accounts
+      localStorage['MetaMask-Accounts'] = JSON.stringify(accounts)
     }
   })
-
-  return syncProvider.send(payload)
-
 }
 
+var syncProvider = new Web3.providers.HttpProvider('https://rawtestrpc.metamask.io/')
+// var unsupportedMethods = ['eth_accounts']
+remoteProvider.send = function(payload){
+  var result = null
+  switch (payload.method) {
+    
+    case 'eth_accounts':
+      // read from localStorage
+      accountsCache = JSON.parse(localStorage['MetaMask-Accounts'] || '[]')
+      result = accountsCache
+      break
+
+    case 'eth_coinbase':
+      // read from localStorage
+      accountsCache = JSON.parse(localStorage['MetaMask-Accounts'] || '[]')
+      result = accountsCache[0] || '0x0000000000000000000000000000000000000000'
+      break
+
+    // fallback to normal rpc
+    default:
+      return syncProvider.send(payload)
+
+  }
+
+  // return the result
+  return {
+      id: payload.id,
+      jsonrpc: payload.jsonrpc,
+      result: result,
+    }
+}
 
 // create web3
 var web3 = new Web3(remoteProvider)