access js/window.web3 in advanced-safe way

src/cljs/commiteth/common.cljs

@@ -2,10 +2,14 @@
   (:require [reagent.core :as r]
             [re-frame.core :as rf]
             [clojure.string :as str]
+            [goog.object :as gobj]
             [goog.date.relative]
             [goog.i18n.DateTimePatterns :as DateTimePatterns])
   (:import (goog.i18n DateTimeFormat)))
 
+(defn web3 []
+  (gobj/get js/window "web3"))
+
 (defn input [val-ratom props]
   (fn []
     [:input

src/cljs/commiteth/handlers.cljs

@@ -12,7 +12,8 @@
             [akiroz.re-frame.storage
              :as rf-storage
              :refer [reg-co-fx!]]
-            [commiteth.ui-model :as ui-model]))
+            [commiteth.ui-model :as ui-model]
+            [commiteth.common :as common]))
 
 
 (rf-storage/reg-co-fx! :commiteth-sob {:fx :store
@@ -49,7 +50,7 @@
 (reg-event-fx
  :initialize-web3
  (fn [{:keys [db]} [_]]
-      (let [injected-web3 (-> js/window .-web3)
+      (let [injected-web3 (common/web3)
             w3 (when (boolean injected-web3)
                 (do
                   (println "Using injected Web3 constructor with current provider")

src/cljs/commiteth/manage_payouts.cljs

@@ -78,10 +78,9 @@
         [:container
          [:div.ui.active.inverted.dimmer
           [:div.ui.text.loader "Loading"]]]
-        (let [web3 (.-web3 js/window)
-              bounties (vals @owner-bounties)]
+        (let [bounties (vals @owner-bounties)]
           [:div.ui.container
-           (when (nil? web3)
+           (when (nil? (common/web3))
              [:div.ui.warning.message
               [:i.warning.icon]
               "To sign off claims, please view Status Open Bounty in Status, Mist or Metamask"])