Handle audio device support checking

ext/src/background/background.ts

@@ -11,6 +11,7 @@ import selectorManager from "./selectorManager";
 
 import { initMenus } from "./menus";
 import { initWhitelist } from "./whitelist";
+import { baseConfigStorage, fetchBaseConfig } from "../cast/googleapi";
 
 const _ = browser.i18n.getMessage;
 
@@ -81,6 +82,31 @@ async function notifyBridgeCompat() {
     }
 }
 
+/**
+ * Updates locally-stored base config data if never downloaded or since
+ * expired.
+ */
+async function cacheBaseConfig() {
+    const { baseConfigUpdated } = await baseConfigStorage.get(
+        "baseConfigUpdated"
+    );
+
+    // If never updated or updated more than 48 hours ago
+    if (
+        !baseConfigUpdated ||
+        (Date.now() - baseConfigUpdated) / 1000 >= 172800
+    ) {
+        logger.info("Fetching updated Chromecast base config...");
+        const baseConfig = await fetchBaseConfig();
+        if (baseConfig) {
+            await baseConfigStorage.set({
+                baseConfig,
+                baseConfigUpdated: Date.now()
+            });
+        }
+    }
+}
+
 let isInitialized = false;
 
 async function init() {
@@ -130,4 +156,5 @@ async function init() {
     });
 }
 
+cacheBaseConfig();
 init();

ext/src/background/selectorManager.ts

@@ -4,6 +4,7 @@ import options from "../lib/options";
 import logger from "../lib/logger";
 
 import { getMediaTypesForPageUrl } from "../lib/utils";
+import { BaseConfig, baseConfigStorage, getAppTag } from "../cast/googleapi";
 import { SessionRequest } from "../cast/sdk/classes";
 
 import castManager from "./castManager";
@@ -22,6 +23,16 @@ import {
     ReceiverSelectorMediaType
 } from "../types";
 
+let baseConfig: BaseConfig;
+baseConfigStorage
+    .get("baseConfig")
+    .then(value => {
+        baseConfig = value.baseConfig;
+    })
+    .catch(() => {
+        logger.error("Failed to get Chromecast base config!");
+    });
+
 let sharedSelector: ReceiverSelector;
 async function getSelector() {
     if (!sharedSelector) {
@@ -215,6 +226,12 @@ async function getSelection(
         // Ensure status manager is initialized
         await deviceManager.init();
 
+        let isRequestAppAudioCompatible: Optional<boolean>;
+        if (castInstance?.appId) {
+            const appTag = getAppTag(baseConfig, castInstance.appId);
+            isRequestAppAudioCompatible = appTag?.supports_audio_only;
+        }
+
         sharedSelector.open({
             receiverDevices: deviceManager.getDevices(),
             defaultMediaType,
@@ -226,7 +243,8 @@ async function getSelection(
                       url: pageUrl,
                       tabId: contextTabId,
                       frameId: contextFrameId,
-                      sessionRequest: selectionOpts?.sessionRequest
+                      sessionRequest: selectionOpts?.sessionRequest,
+                      isRequestAppAudioCompatible
                   }
                 : undefined
         });