Feature Flag + Mobile Sync (#5955)

1 files changed, 12 insertions, 1 deletions

diff --git a/app/scripts/controllers/preferences.js b/app/scripts/controllers/preferences.js
index 565f4f292..584b6bc51 100644
--- a/app/scripts/controllers/preferences.js
+++ b/app/scripts/controllers/preferences.js
@@ -18,7 +18,9 @@ class PreferencesController {
    * @property {object} store.assetImages Contains assets objects related to assets added
    * @property {boolean} store.useBlockie The users preference for blockie identicons within the UI
    * @property {object} store.featureFlags A key-boolean map, where keys refer to features and booleans to whether the
-   * user wishes to see that feature
+   * user wishes to see that feature.
+   *
+   * Feature flags can be set by the global function `setPreference(feature, enabled)`, and so should not expose any sensitive behavior.
    * @property {object} store.knownMethodData Contains all data methods known by the user
    * @property {string} store.currentLocale The preferred language locale key
    * @property {string} store.selectedAddress A hex string that matches the currently selected address in the app
@@ -33,6 +35,11 @@ class PreferencesController {
       tokens: [],
       suggestedTokens: {},
       useBlockie: false,
+
+      // WARNING: Do not use feature flags for security-sensitive things.
+      // Feature flag toggling is available in the global namespace
+      // for convenient testing of pre-release features, and should never
+      // perform sensitive operations.
       featureFlags: {},
       knownMethodData: {},
       currentLocale: opts.initLangCode,
@@ -52,6 +59,10 @@ class PreferencesController {
     this.store = new ObservableStore(initState)
     this.openPopup = opts.openPopup
     this._subscribeProviderType()
+
+    global.setPreference = (key, value) => {
+      return this.setFeatureFlag(key, value)
+    }
   }
 // PUBLIC METHODS