Begin adding eth_watchToken

app/scripts/background.js

@@ -248,6 +248,7 @@ function setupController (initState, initLangCode) {
     showUnconfirmedMessage: triggerUi,
     unlockAccountMessage: triggerUi,
     showUnapprovedTx: triggerUi,
+    showAddTokenUi: triggerUi,
     // initial state
     initState,
     // initial locale code
@@ -436,3 +437,4 @@ extension.runtime.onInstalled.addListener(function (details) {
     extension.tabs.create({url: 'https://metamask.io/#how-it-works'})
   }
 })
+

app/scripts/controllers/preferences.js

@@ -25,6 +25,7 @@ class PreferencesController {
       frequentRpcList: [],
       currentAccountTab: 'history',
       tokens: [],
+      suggestedTokens: [],
       useBlockie: false,
       featureFlags: {},
       currentLocale: opts.initLangCode,
@@ -48,6 +49,30 @@ class PreferencesController {
     this.store.updateState({ useBlockie: val })
   }
 
+  getSuggestedTokens () {
+    return this.store.getState().suggestedTokens
+  }
+
+  /**
+   * RPC engine middleware for requesting new token added
+   *
+   * @param req
+   * @param res
+   * @param {Function} - next
+   * @param {Function} - end
+   */
+  requestAddToken(req, res, next, end) {
+    if (req.method === 'eth_watchToken') {
+      // Validate params!
+ //     this.suggestedTokens.push(req.params)
+      const [ rawAddress, symbol, decimals ] = req.params
+      this.addToken(rawAddress, symbol, decimals)
+      end(null, rawAddress)
+    } else {
+      next()
+    }
+  }
+
   /**
    * Getter for the `useBlockie` property
    *

app/scripts/metamask-controller.js

@@ -1077,6 +1077,7 @@ module.exports = class MetamaskController extends EventEmitter {
     engine.push(createOriginMiddleware({ origin }))
     engine.push(createLoggerMiddleware({ origin }))
     engine.push(filterMiddleware)
+    engine.push(this.preferencesController.requestAddToken.bind(this.preferencesController))
     engine.push(createProviderMiddleware({ provider: this.provider }))
 
     // setup connection