Localized release notes

ts/services/releaseNotesFetcher.ts

@@ -106,20 +106,51 @@ export class ReleaseNotesFetcher {
     }
 
     const { uuid, ctaId, link } = note;
-    const result = await window.textsecure.server.getReleaseNote({
-      uuid,
-    });
-    strictAssert(
-      result.uuid === uuid,
-      'UUID of localized release note should match requested UUID'
-    );
+    const globalLocale = new Intl.Locale(window.SignalContext.getI18nLocale());
+    const localesToTry = [
+      globalLocale.toString(),
+      globalLocale.language.toString(),
+      'en',
+    ].map(locale => locale.toLocaleLowerCase().replace('-', '_'));
 
-    return {
-      ...result,
-      uuid,
-      ctaId,
-      link,
-    };
+    for (const localeToTry of localesToTry) {
+      try {
+        // eslint-disable-next-line no-await-in-loop
+        const hash = await window.textsecure.server.getReleaseNoteHash({
+          uuid,
+          locale: localeToTry,
+        });
+
+        if (hash === undefined) {
+          continue;
+        }
+
+        // eslint-disable-next-line no-await-in-loop
+        const result = await window.textsecure.server.getReleaseNote({
+          uuid,
+          locale: localeToTry,
+        });
+
+        strictAssert(
+          result.uuid === uuid,
+          'UUID of localized release note should match requested UUID'
+        );
+
+        return {
+          ...result,
+          uuid,
+          ctaId,
+          link,
+        };
+      } catch {
+        // If either request fails, try the next locale
+        continue;
+      }
+    }
+
+    throw new Error(
+      `Could not fetch release note with any locale for UUID ${uuid}`
+    );
   }
 
   private async processReleaseNotes(

ts/textsecure/WebAPI.ts

@@ -1216,6 +1216,7 @@ export type GetBackupInfoResponseType = z.infer<
 
 export type GetReleaseNoteOptionsType = Readonly<{
   uuid: string;
+  locale: string;
 }>;
 
 export const releaseNoteSchema = z.object({
@@ -1408,6 +1409,9 @@ export type WebAPIType = {
   getReleaseNote: (
     options: GetReleaseNoteOptionsType
   ) => Promise<ReleaseNoteResponseType>;
+  getReleaseNoteHash: (
+    options: GetReleaseNoteOptionsType
+  ) => Promise<string | undefined>;
   getReleaseNotesManifest: () => Promise<ReleaseNotesManifestResponseType>;
   getReleaseNotesManifestHash: () => Promise<string | undefined>;
   getSticker: (packId: string, stickerId: number) => Promise<Uint8Array>;
@@ -1880,6 +1884,7 @@ export function initialize({
       getProfileUnauth,
       getProvisioningResource,
       getReleaseNote,
+      getReleaseNoteHash,
       getReleaseNotesManifest,
       getReleaseNotesManifestHash,
       getTransferArchive,
@@ -2174,15 +2179,43 @@ export function initialize({
         languages: Record<string, Array<string>>;
       };
     }
+
+    async function getReleaseNoteHash({
+      uuid,
+      locale,
+    }: {
+      uuid: string;
+      locale: string;
+    }): Promise<string | undefined> {
+      const { response } = await _ajax({
+        call: 'releaseNotes',
+        host: resourcesUrl,
+        httpType: 'HEAD',
+        urlParameters: `/${uuid}/${locale}.json`,
+        responseType: 'byteswithdetails',
+      });
+
+      const etag = response.headers.get('etag');
+
+      if (etag == null) {
+        return undefined;
+      }
+
+      return etag;
+    }
     async function getReleaseNote({
       uuid,
-    }: GetReleaseNoteOptionsType): Promise<ReleaseNoteResponseType> {
+      locale,
+    }: {
+      uuid: string;
+      locale: string;
+    }): Promise<ReleaseNoteResponseType> {
       const rawRes = await _ajax({
         call: 'releaseNotes',
         host: resourcesUrl,
         httpType: 'GET',
         responseType: 'json',
-        urlParameters: `/${uuid}/en.json`,
+        urlParameters: `/${uuid}/${locale}.json`,
       });
       return parseUnknown(releaseNoteSchema, rawRes);
     }