Fix stale-closure in ad-detection code

Using that global variable was a bad idea. Stick to redux as the source of truth.

The flag is not listed for rehydration, so it will always start off as `undefined`, which is what we need anyways.

`undefined` indicates we haven't tested for ad-blockers, so we'll run the fetch and update the store with a true|false value.

ui/effects/use-should-show-ads.js

@@ -3,13 +3,12 @@ import React from 'react';
 import { SHOW_ADS } from 'config';
 
 const NO_COUNTRY_CHECK = true;
-
 const GOOGLE_AD_URL = 'https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js';
-let ad_blocker_detected;
 
 export default function useShouldShowAds(
   hasPremiumPlus: boolean,
   userCountry: string,
+  isAdBlockerFound: ?boolean,
   doSetAdBlockerFound: (boolean) => void
 ) {
   const [shouldShowAds, setShouldShowAds] = React.useState(resolveAdVisibility());
@@ -18,44 +17,26 @@ export default function useShouldShowAds(
     // 'ad_blocker_detected' and 'hasPremiumPlus' will be undefined until
     // fetched. Only show when it is exactly 'false'.
     return (
-      SHOW_ADS &&
-      (NO_COUNTRY_CHECK || userCountry === 'US') &&
-      ad_blocker_detected === false &&
-      hasPremiumPlus === false
+      SHOW_ADS && (NO_COUNTRY_CHECK || userCountry === 'US') && isAdBlockerFound === false && hasPremiumPlus === false
     );
   }
 
-  // -- Check for ad-blockers
   React.useEffect(() => {
-    if (ad_blocker_detected === undefined) {
-      let mounted = true;
-
+    if (isAdBlockerFound === undefined) {
       fetch(GOOGLE_AD_URL)
         .then((response) => {
           const detected = response.redirected === true;
-          ad_blocker_detected = detected;
-          doSetAdBlockerFound(detected); // Also stash in redux for components to listen to.
+          doSetAdBlockerFound(detected);
         })
         .catch(() => {
-          ad_blocker_detected = true;
           doSetAdBlockerFound(true);
-        })
-        .finally(() => {
-          if (mounted) {
-            setShouldShowAds(resolveAdVisibility());
-          }
         });
-
-      return () => {
-        mounted = false;
-      };
     }
   }, []);
 
-  // --- Check for Premium+
   React.useEffect(() => {
     setShouldShowAds(resolveAdVisibility());
-  }, [hasPremiumPlus]);
+  }, [hasPremiumPlus, isAdBlockerFound]);
 
   return shouldShowAds;
 }

web/component/ads/index.js

@@ -1,5 +1,6 @@
 import { connect } from 'react-redux';
 import { doSetAdBlockerFound } from 'redux/actions/app';
+import { selectAdBlockerFound } from 'redux/selectors/app';
 import { makeSelectClaimForUri, selectClaimIsNsfwForUri } from 'redux/selectors/claims';
 import { selectOdyseeMembershipIsPremiumPlus, selectUserCountry } from 'redux/selectors/user';
 import Ads from './view';
@@ -7,6 +8,7 @@ import Ads from './view';
 const select = (state, props) => ({
   claim: makeSelectClaimForUri(props.uri)(state),
   isMature: selectClaimIsNsfwForUri(state, props.uri),
+  isAdBlockerFound: selectAdBlockerFound(state),
   userHasPremiumPlus: selectOdyseeMembershipIsPremiumPlus(state),
   userCountry: selectUserCountry(state),
 });

web/component/ads/view.jsx

@@ -59,6 +59,7 @@ type Props = {
   className?: string,
   noFallback?: boolean,
   // --- redux ---
+  isAdBlockerFound: ?boolean,
   userHasPremiumPlus: boolean,
   userCountry: string,
   doSetAdBlockerFound: (boolean) => void,
@@ -69,6 +70,7 @@ function Ads(props: Props) {
     type = 'video',
     tileLayout,
     small,
+    isAdBlockerFound,
     userHasPremiumPlus,
     userCountry,
     className,
@@ -76,7 +78,7 @@ function Ads(props: Props) {
     doSetAdBlockerFound,
   } = props;
 
-  const shouldShowAds = useShouldShowAds(userHasPremiumPlus, userCountry, doSetAdBlockerFound);
+  const shouldShowAds = useShouldShowAds(userHasPremiumPlus, userCountry, isAdBlockerFound, doSetAdBlockerFound);
   const adConfig = USE_ADNIMATION ? AD_CONFIGS.ADNIMATION : resolveVidcrunchConfig();
 
   // add script to DOM

web/component/adsBanner/index.js

@@ -1,11 +1,13 @@
 import { connect } from 'react-redux';
 import * as SETTINGS from 'constants/settings';
 import { doSetAdBlockerFound } from 'redux/actions/app';
+import { selectAdBlockerFound } from 'redux/selectors/app';
 import { selectClientSetting } from 'redux/selectors/settings';
 import { selectOdyseeMembershipIsPremiumPlus, selectUserCountry } from 'redux/selectors/user';
 import AdsBanner from './view';
 
 const select = (state, props) => ({
+  isAdBlockerFound: selectAdBlockerFound(state),
   userHasPremiumPlus: selectOdyseeMembershipIsPremiumPlus(state),
   userCountry: selectUserCountry(state),
   currentTheme: selectClientSetting(state, SETTINGS.THEME),

web/component/adsBanner/view.jsx

@@ -35,6 +35,7 @@ const adsSignInDriver = (
 let gReferenceCounter = 0;
 
 type Props = {
+  isAdBlockerFound: ?boolean,
   userHasPremiumPlus: boolean,
   userCountry: string,
   currentTheme: string,
@@ -42,8 +43,8 @@ type Props = {
 };
 
 export default function AdsBanner(props: Props) {
-  const { userHasPremiumPlus, userCountry, currentTheme, doSetAdBlockerFound } = props;
-  const shouldShowAds = useShouldShowAds(userHasPremiumPlus, userCountry, doSetAdBlockerFound);
+  const { isAdBlockerFound, userHasPremiumPlus, userCountry, currentTheme, doSetAdBlockerFound } = props;
+  const shouldShowAds = useShouldShowAds(userHasPremiumPlus, userCountry, isAdBlockerFound, doSetAdBlockerFound);
 
   React.useEffect(() => {
     if (shouldShowAds) {