From 28553aba152e7841f4daad3f1fc1dfe114655431 Mon Sep 17 00:00:00 2001
From: stefanfeng <stefan@autopas.cn>
Date: Fri, 4 Sep 2026 13:47:46 +0800
Subject: [PATCH] fix(avatar): allow knowledge uploads up to 20MB

---
 digital-avatar-app/backend/routers/knowledge.py | 4 ++--
 digital-avatar-app/nginx.conf                   | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/digital-avatar-app/backend/routers/knowledge.py b/digital-avatar-app/backend/routers/knowledge.py
index 2b2a4fa..23de111 100644
--- a/digital-avatar-app/backend/routers/knowledge.py
+++ b/digital-avatar-app/backend/routers/knowledge.py
@@ -17,7 +17,7 @@ UPLOAD_DIR = os.path.abspath(os.getenv("UPLOAD_DIR", os.path.join(BASE_DIR, "upl
 os.makedirs(UPLOAD_DIR, exist_ok=True)
 
 ALLOWED_EXT = {".md", ".txt", ".pdf", ".doc", ".docx", ".xlsx"}
-MAX_UPLOAD_BYTES = 10 * 1024 * 1024
+MAX_UPLOAD_BYTES = 20 * 1024 * 1024
 
 
 class QAIn(BaseModel):
@@ -82,7 +82,7 @@ async def upload_doc(avatar_id: str, file: UploadFile = File(...), authorization
     path = os.path.join(avatar_dir, stored)
     content = await file.read()
     if len(content) > MAX_UPLOAD_BYTES:
-        return fail("文件不能超过 10MB", code=400)
+        return fail("文件不能超过 20MB", code=400)
     with open(path, "wb") as f:
         f.write(content)
     doc = KnowledgeDoc(
diff --git a/digital-avatar-app/nginx.conf b/digital-avatar-app/nginx.conf
index 2919b85..bf31dc3 100644
--- a/digital-avatar-app/nginx.conf
+++ b/digital-avatar-app/nginx.conf
@@ -23,6 +23,10 @@ http {
 
         root /usr/share/nginx/html;
         index index.html;
+        # Keep the application gateway aligned with the production edge gateway.
+        # Without this Nginx rejects ordinary PDF uploads with HTTP 413 before
+        # FastAPI can return its user-facing file-size validation message.
+        client_max_body_size 20m;
 
         # SPA 兜底（hash 路由下深链接也可正常加载）
         location / {