Switch to different HTTP endpoint for fetching version info.

This allows us to get all version numbers with just one request where previously we needed one request per release channel.

Additionally fetch ESR version number.

Author: Trikolon

src/app.ts

@@ -88,29 +88,16 @@ async function fetchBugMetadata(bugIds: Set<string>): Promise<BugMetaMap> {
  * @returns The versions for each release channel.
  */
 async function fetchVersionsPerChannel(): Promise<FirefoxVersions> {
-  let [nightly, beta, release] = await Promise.all([
-    fetchVersionNumber("nightly"),
-    fetchVersionNumber("beta"),
-    fetchVersionNumber("release"),
-  ]);
-  return {
-    nightly,
-    beta,
-    release,
-  };
-}
-
-/**
- * Fetch the version number for a given release channel.
- * @param releaseChannel The release channel to fetch the version number for.
- * @returns The version number for the given release channel.
- */
-async function fetchVersionNumber(releaseChannel: string): Promise<string> {
-  let url = new URL("https://whattrainisitnow.com/api/release/schedule/");
-  url.searchParams.set("version", releaseChannel);
+  const url = "https://product-details.mozilla.org/1.0/firefox_versions.json";
   const response = await fetch(url);
   const json = await response.json();
-  return json.version;
+
+  return {
+    nightly: json.FIREFOX_NIGHTLY,
+    beta: json.LATEST_FIREFOX_RELEASED_DEVEL_VERSION,
+    release: json.LATEST_FIREFOX_VERSION,
+    esr: json.FIREFOX_ESR,
+  };
 }
 
 @customElement("app-root")

src/types.ts

@@ -24,11 +24,12 @@ export interface ExceptionListEntry extends URLClassifierExceptionListEntry {
 }
 
 // Firefox release channels for version filtering.
-export type FirefoxChannel = "nightly" | "beta" | "release";
+export type FirefoxChannel = "nightly" | "beta" | "release" | "esr";
 
 // Firefox versions for each release channel.
 export interface FirefoxVersions {
   nightly: string;
   beta: string;
   release: string;
+  esr: string;
 }