Initial release

backend/app/api/routers/users.py

@@ -0,0 +1,33 @@
+import time
+
+from fastapi import APIRouter
+from fastapi.responses import Response
+
+router = APIRouter(tags=["users"])
+
+# user_id → (bytes, content_type, expires_at)
+_avatar_cache: dict[int, tuple[bytes, str, float]] = {}
+
+
+@router.get("/users/{user_id}/avatar")
+async def get_user_avatar(user_id: int) -> Response:
+    from app.core.config import settings
+    ttl = settings.avatar_cache_ttl
+    cached = _avatar_cache.get(user_id)
+    if cached and time.monotonic() < cached[2]:
+        return Response(content=cached[0], media_type=cached[1],
+                        headers={"Cache-Control": f"public, max-age={ttl}"})
+    from app.bot.router import bot
+    try:
+        photos = await bot.get_user_profile_photos(user_id, limit=1)
+        if not photos.photos:
+            return Response(status_code=404)
+        file_id = photos.photos[0][-1].file_id
+        data = await bot.download(file_id)
+        content = data.read()
+        content_type = "image/jpeg"
+        _avatar_cache[user_id] = (content, content_type, time.monotonic() + ttl)
+        return Response(content=content, media_type=content_type,
+                        headers={"Cache-Control": f"public, max-age={ttl}"})
+    except Exception:
+        return Response(status_code=404)