feat: complete huihui square avatar workflows

backend/app/api/endpoints/users.py

@@ -1,5 +1,8 @@
 """虚拟用户管理接口"""
 from typing import Optional
+from pathlib import Path
+import uuid
+import mimetypes
 from fastapi import APIRouter, Depends, Query, UploadFile, File, HTTPException
 from fastapi.responses import StreamingResponse
 import io
@@ -9,6 +12,21 @@ from app.schemas import ApiResponse, UserCreateRequest, UserUpdateRequest, UserB
 from app.services.user_service import user_service
 
 router = APIRouter()
+_UPLOADS_DIR = Path(__file__).resolve().parents[2] / "uploads" / "avatars"
+_UPLOADS_DIR.mkdir(parents=True, exist_ok=True)
+
+
+async def _save_local_avatar(file_bytes: bytes, filename: str, content_type: str | None) -> str:
+    ext = Path(filename or "").suffix.lower()
+    if ext not in {".jpg", ".jpeg", ".png", ".gif", ".webp"}:
+        guessed_ext = mimetypes.guess_extension(content_type or "") or ".jpg"
+        ext = ".jpg" if guessed_ext == ".jpe" else guessed_ext
+        if ext not in {".jpg", ".jpeg", ".png", ".gif", ".webp"}:
+            ext = ".jpg"
+
+    target = _UPLOADS_DIR / f"{uuid.uuid4().hex}{ext}"
+    target.write_bytes(file_bytes)
+    return f"/api/uploads/avatars/{target.name}"
 
 
 @router.get("")
@@ -268,13 +286,20 @@ async def sync_all_profiles(db=Depends(get_db)):
                 sess = await get_session(uid)
                 if not sess:
                     return False
+                ur = await s.execute(select(_VU).where(_VU.id == uid))
+                user = ur.scalar_one_or_none()
+                if not user:
+                    return False
                 platform_uid = sess.get("platform_uid", "")
                 # 登录成功时 session 里已存有用户信息
                 vals = {}
                 if platform_uid: vals["platform_uid"] = platform_uid
                 # session 里的字段（登录时写入）
-                if sess.get("nickname"):    vals["nickname"]  = sess["nickname"]
-                if sess.get("real_name"):   vals["real_name"] = sess["real_name"]
+                sync_nickname = sess.get("nickname", "")
+                sync_real_name = sess.get("real_name", "")
+                resolved_nickname = news_service._resolve_synced_nickname(user, sync_nickname, sync_real_name)
+                if resolved_nickname: vals["nickname"] = resolved_nickname
+                if sync_real_name:   vals["real_name"] = sync_real_name
                 if sess.get("sex"):         vals["sex"]       = int(sess["sex"])
                 if sess.get("avatar"):      vals["avatar_url"] = sess["avatar"]
                 if vals:
@@ -327,9 +352,8 @@ async def upload_avatar(
         else:
             return ApiResponse(code=500, message=f"头像上传到平台失败: {result}")
     else:
-        # 仅本地存储（转 base64 或存储到本地）
-        import base64
-        avatar_url = f"data:{file.content_type};base64,{base64.b64encode(file_bytes).decode()}"
+        # 未登录用户本地落盘，避免 base64 超过 avatar_url 字段长度
+        avatar_url = await _save_local_avatar(file_bytes, file.filename or "", file.content_type)
 
     # 更新数据库
     await db.execute(update(_VU).where(_VU.id == user_id).values(avatar_url=avatar_url))