Cache Telegram avatars locally and refresh avatar file ids

frontend/server/api/omni/telegram/avatar.get.ts

@@ -1,9 +1,13 @@
 import { getQuery, setHeader } from "h3";
+import { existsSync } from "node:fs";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
+import path from "node:path";
 import { getAuthContext } from "../../../utils/auth";
 import { prisma } from "../../../utils/prisma";
 import { requireTelegramBotToken, telegramApiBase, telegramBotApi } from "../../../utils/telegram";
 
 const TELEGRAM_FILE_MARKER = "tg-file:";
+const AVATAR_CACHE_DIR = path.join(process.cwd(), ".data", "telegram-avatars");
 
 type TelegramFileMeta = {
   file_id: string;
@@ -17,6 +21,10 @@ function parseTelegramFileId(avatarUrl: string | null | undefined) {
   return fileId || null;
 }
 
+function sanitizeCacheKey(input: string) {
+  return input.replace(/[^a-zA-Z0-9._-]/g, "_");
+}
+
 export default defineEventHandler(async (event) => {
   const auth = await getAuthContext(event);
   const query = getQuery(event);
@@ -45,6 +53,20 @@ export default defineEventHandler(async (event) => {
     throw createError({ statusCode: 404, statusMessage: "telegram avatar is missing" });
   }
 
+  const cacheKey = sanitizeCacheKey(fileId);
+  const cacheBodyPath = path.join(AVATAR_CACHE_DIR, `${cacheKey}.img`);
+  const cacheMetaPath = path.join(AVATAR_CACHE_DIR, `${cacheKey}.meta`);
+
+  if (existsSync(cacheBodyPath) && existsSync(cacheMetaPath)) {
+    const cachedBody = await readFile(cacheBodyPath);
+    const cachedContentType = (await readFile(cacheMetaPath, "utf8")).trim() || "image/jpeg";
+
+    setHeader(event, "content-type", cachedContentType);
+    setHeader(event, "cache-control", "private, max-age=300");
+    setHeader(event, "content-length", cachedBody.length);
+    return cachedBody;
+  }
+
   const meta = await telegramBotApi<TelegramFileMeta>("getFile", { file_id: fileId });
   const filePath = String(meta?.file_path ?? "").trim();
   if (!filePath) {
@@ -62,6 +84,10 @@ export default defineEventHandler(async (event) => {
   const contentLength = remote.headers.get("content-length");
   const body = Buffer.from(await remote.arrayBuffer());
 
+  await mkdir(AVATAR_CACHE_DIR, { recursive: true });
+  await writeFile(cacheBodyPath, body);
+  await writeFile(cacheMetaPath, contentType, "utf8");
+
   setHeader(event, "content-type", contentType);
   setHeader(event, "cache-control", "private, max-age=300");
   if (contentLength) {

omni_chat/src/worker.ts

@@ -248,7 +248,7 @@ async function maybeHydrateContact(contactId: string, profile: ContactProfile) {
   }
 
   const currentAvatar = asString(current.avatarUrl);
-  if (profile.avatarUrl && !currentAvatar) {
+  if (profile.avatarUrl && profile.avatarUrl !== currentAvatar) {
     updates.avatarUrl = profile.avatarUrl;
   }