Connect keyring controller to address book to prevent additional duplicates.

app/scripts/controllers/address-book.js

@@ -7,11 +7,12 @@ class AddressBookController {
   // Controller in charge of managing the address book functionality from the
   // recipients field on the send screen. Manages a history of all saved
   // addresses and all currently owned addresses.
-  constructor (opts = {}) {
+  constructor (opts = {}, keyringController) {
     const initState = extend({
       addressBook: [],
     }, opts.initState)
     this.store = new ObservableStore(initState)
+    this.keyringController = keyringController
   }
 
   //
@@ -39,9 +40,16 @@ class AddressBookController {
   // upper limit to the number of addresses.
   _addToAddressBook (address, name) {
     let addressBook = this._getAddressBook()
-    let index = addressBook.findIndex((element) => { return element.address.toLowerCase() === address.toLowerCase() || element.name === name })
-    if (index !== -1) {
-      addressBook.splice(index, 1)
+    let identities = this._getIdentities()
+
+    let addressBookIndex = addressBook.findIndex((element) => { return element.address.toLowerCase() === address.toLowerCase() || element.name === name })
+    let identitiesIndex = Object.keys(identities).findIndex((element) => { return element.toLowerCase() === address.toLowerCase() })
+    // trigger this condition if we own this address--no need to overwrite.
+    if (identitiesIndex !== -1) {
+      return Promise.resolve(addressBook)
+    // trigger this condition if we've seen this address before--may need to update nickname.
+    } else if (addressBookIndex !== -1) {
+      addressBook.splice(addressBookIndex, 1)
     }
     addressBook.push({
       address: address,
@@ -56,6 +64,12 @@ class AddressBookController {
     return this.store.getState().addressBook
   }
 
+  // Retrieves identities from the keyring controller in order to avoid
+  // duplication
+  _getIdentities () {
+    return this.keyringController.memStore.getState().identities
+  }
+
 }
 
 module.exports = AddressBookController

app/scripts/metamask-controller.js

@@ -51,11 +51,6 @@ module.exports = class MetamaskController extends EventEmitter {
       initState: initState.PreferencesController,
     })
 
-    // address book controller
-    this.addressBookController = new AddressBookController({
-      initState: initState.AddressBookController,
-    })
-
     // currency controller
     this.currencyController = new CurrencyController({
       initState: initState.CurrencyController,
@@ -86,6 +81,11 @@ module.exports = class MetamaskController extends EventEmitter {
       autoFaucet(address)
     })
 
+    // address book controller
+    this.addressBookController = new AddressBookController({
+      initState: initState.AddressBookController,
+    }, this.keyringController)
+
     // tx mgmt
     this.txManager = new TxManager({
       initState: initState.TransactionManager,