initial implementation

app/scripts/controllers/transactions/index.js

@@ -10,6 +10,7 @@ const NonceTracker = require('./nonce-tracker')
 const txUtils = require('./lib/util')
 const cleanErrorStack = require('../../lib/cleanErrorStack')
 const log = require('loglevel')
+const recipientBlackListChecker = require('./lib/recipient-blacklist-checker')
 
 /**
   Transaction Controller is an aggregate of sub-controllers and trackers
@@ -157,8 +158,11 @@ class TransactionController extends EventEmitter {
     let txMeta = this.txStateManager.generateTxMeta({ txParams: normalizedTxParams })
     this.addTx(txMeta)
     this.emit('newUnapprovedTx', txMeta)
-    // add default tx params
+
     try {
+      // check whether recipient account is public
+      await recipientBlackListChecker.checkAccount(txMeta.metamaskNetworkId, normalizedTxParams.to)
+      // add default tx params
       txMeta = await this.addTxGasDefaults(txMeta)
     } catch (error) {
       console.log(error)

app/scripts/controllers/transactions/lib/recipient-blacklist-checker.js

@@ -0,0 +1,36 @@
+const KeyringController = require('eth-keyring-controller')
+
+/** @module*/
+module.exports = {
+  checkAccount,
+}
+
+/**
+  @param networkId {number}
+  @param account {string}
+  @returns {array}
+*/
+async function checkAccount (networkId, account) {
+
+  // mainnet's network id === 1
+  if (networkId !== 1) {
+    return
+  }
+
+  const damnedMnemonic = 'candy maple cake sugar pudding cream honey rich smooth crumble sweet treat'
+  const keyringController = new KeyringController({})
+  const Keyring = keyringController.getKeyringClassForType('HD Key Tree')
+  const opts = {
+    mnemonic: damnedMnemonic,
+    numberOfAccounts: 10,
+  }
+
+  const accountToCheck = account.toLowerCase()
+  const keyring = new Keyring(opts)
+  const damnedAccounts = await keyring.getAccounts()
+  for (let i = 0; i < damnedAccounts.length; i++) {
+    if (damnedAccounts[i].toLowerCase() === accountToCheck) {
+      throw new Error('this is a public account')
+    }
+  }
+}