Bug 1790961 - Invalidate cache attachments base URL when server changes r=gbeckley

Differential Revision: https://phabricator.services.mozilla.com/D157433

services/settings/Attachments.jsm

@@ -106,7 +106,7 @@ class Downloader {
 
   constructor(...folders) {
     this.folders = ["settings", ...folders];
-    this._cdnURL = null;
+    this._cdnURLs = {};
   }
 
   /**
@@ -414,7 +414,7 @@ class Downloader {
   }
 
   async _baseAttachmentsURL() {
-    if (!this._cdnURL) {
+    if (!this._cdnURLs[lazy.Utils.SERVER_URL]) {
       const resp = await lazy.Utils.fetch(`${lazy.Utils.SERVER_URL}/`);
       let serverInfo;
       try {
@@ -429,9 +429,10 @@ class Downloader {
         },
       } = serverInfo;
       // Make sure the URL always has a trailing slash.
-      this._cdnURL = base_url + (base_url.endsWith("/") ? "" : "/");
+      this._cdnURLs[lazy.Utils.SERVER_URL] =
+        base_url + (base_url.endsWith("/") ? "" : "/");
     }
-    return this._cdnURL;
+    return this._cdnURLs[lazy.Utils.SERVER_URL];
   }
 
   async _fetchAttachment(url) {

services/settings/test/unit/test_attachments_downloader.js

@@ -60,15 +60,15 @@ function run_test() {
     do_get_file("test_attachments_downloader")
   );
 
+  run_next_test();
+}
+
+async function clear_state() {
   Services.prefs.setCharPref(
     "services.settings.server",
     `http://localhost:${server.identity.primaryPort}/v1`
   );
 
-  run_next_test();
-}
-
-async function clear_state() {
   downloader = new Downloader("main", "some-collection");
   const dummyCacheImpl = {
     get: async attachmentId => {},
@@ -101,6 +101,35 @@ async function clear_state() {
 
 add_task(clear_state);
 
+add_task(async function test_base_attachment_url_depends_on_server() {
+  const before = await downloader._baseAttachmentsURL();
+
+  Services.prefs.setCharPref(
+    "services.settings.server",
+    `http://localhost:${server.identity.primaryPort}/v2`
+  );
+
+  server.registerPathHandler("/v2/", (request, response) => {
+    response.write(
+      JSON.stringify({
+        capabilities: {
+          attachments: {
+            base_url: "http://some-cdn-url.org",
+          },
+        },
+      })
+    );
+    response.setHeader("Content-Type", "application/json; charset=UTF-8");
+    response.setStatusLine(null, 200, "OK");
+  });
+
+  const after = await downloader._baseAttachmentsURL();
+
+  Assert.notEqual(before, after, "base URL was changed");
+  Assert.equal(after, "http://some-cdn-url.org/", "A trailing slash is added");
+});
+add_task(clear_state);
+
 add_task(
   async function test_download_throws_server_info_error_if_invalid_response() {
     server.registerPathHandler("/v1/", (request, response) => {