Merge pull request #1198 from MetaMask/i1165-predictive

Add predictive address functionality to recipient field in send

1 files changed, 79 insertions, 0 deletions

diff --git a/app/scripts/controllers/address-book.js b/app/scripts/controllers/address-book.js
new file mode 100644
index 000000000..c66eb2bd4
--- /dev/null
+++ b/app/scripts/controllers/address-book.js
@@ -0,0 +1,79 @@
+const ObservableStore = require('obs-store')
+const extend = require('xtend')
+
+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 = {}, keyringController) {
+    const initState = extend({
+      addressBook: [],
+    }, opts.initState)
+    this.store = new ObservableStore(initState)
+    this.keyringController = keyringController
+  }
+
+  //
+  // PUBLIC METHODS
+  //
+
+  // Sets a new address book in store by accepting a new address and nickname.
+  setAddressBook (address, name) {
+    return this._addToAddressBook(address, name)
+    .then((addressBook) => {
+      this.store.updateState({
+        addressBook,
+      })
+      return Promise.resolve()
+    })
+  }
+
+  //
+  // PRIVATE METHODS
+  //
+
+
+  // Performs the logic to add the address and name into the address book. The
+  // pushed object is an object of two fields. Current behavior does not set an
+  // upper limit to the number of addresses.
+  _addToAddressBook (address, name) {
+    let addressBook = this._getAddressBook()
+    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)
+    } else if (addressBook.length > 15) {
+      addressBook.shift()
+    }
+
+
+    addressBook.push({
+      address: address,
+      name,
+    })
+    return Promise.resolve(addressBook)
+  }
+
+  // Internal method to get the address book. Current persistence behavior
+  // should not require that this method be called from the UI directly.
+  _getAddressBook () {
+    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