[PM-4531] feat: completely disable fido2 injection for excluded sites (#6801)

apps/browser/src/vault/fido2/content/content-script.ts

@@ -1,18 +1,46 @@
 import { Message, MessageType } from "./messaging/message";
 import { Messenger } from "./messaging/messenger";
 
-function checkFido2FeatureEnabled() {
+function isFido2FeatureEnabled(): Promise<boolean> {
+  return new Promise((resolve) => {
     chrome.runtime.sendMessage(
       { command: "checkFido2FeatureEnabled" },
-    (response: { result?: boolean }) => initializeFido2ContentScript(response.result)
+      (response: { result?: boolean }) => resolve(response.result)
     );
+  });
 }
 
-function initializeFido2ContentScript(isFido2FeatureEnabled: boolean) {
-  if (isFido2FeatureEnabled !== true) {
-    return;
+async function getFromLocalStorage(keys: string | string[]): Promise<Record<string, any>> {
+  return new Promise((resolve) => {
+    chrome.storage.local.get(keys, (storage: Record<string, any>) => resolve(storage));
+  });
 }
 
+async function isDomainExcluded() {
+  // TODO: This is code copied from `notification-bar.tsx`. We should refactor this into a shared function.
+  // Look up the active user id from storage
+  const activeUserIdKey = "activeUserId";
+  let activeUserId: string;
+
+  const activeUserStorageValue = await getFromLocalStorage(activeUserIdKey);
+  if (activeUserStorageValue[activeUserIdKey]) {
+    activeUserId = activeUserStorageValue[activeUserIdKey];
+  }
+
+  // Look up the user's settings from storage
+  const userSettingsStorageValue = await getFromLocalStorage(activeUserId);
+
+  const excludedDomains = userSettingsStorageValue[activeUserId]?.settings?.neverDomains;
+  return excludedDomains && window.location.hostname in excludedDomains;
+}
+
+async function hasActiveUser() {
+  const activeUserIdKey = "activeUserId";
+  const activeUserStorageValue = await getFromLocalStorage(activeUserIdKey);
+  return activeUserStorageValue[activeUserIdKey] !== undefined;
+}
+
+function initializeFido2ContentScript() {
   const s = document.createElement("script");
   s.src = chrome.runtime.getURL("content/fido2/page-script.js");
   (document.head || document.documentElement).appendChild(s);
@@ -78,4 +106,10 @@ function initializeFido2ContentScript(isFido2FeatureEnabled: boolean) {
   };
 }
 
-checkFido2FeatureEnabled();
+async function run() {
+  if ((await hasActiveUser()) && (await isFido2FeatureEnabled()) && !(await isDomainExcluded())) {
+    initializeFido2ContentScript();
+  }
+}
+
+run();