Code refactoring

- Code refactoring
- Fix a bug that the other player will not become the host of the room at once, when the player disconnect in link play.

> Maybe add many unknown bugs. XD
> The song database `arcsong.db` will not used in the future. You can use a tool in `tool` folder to import old data.

latest version/server/present.py

@@ -0,0 +1,38 @@
+from core.error import ArcError
+from core.present import UserPresent, UserPresentList
+from core.sql import Connect
+from core.user import UserOnline
+from flask import Blueprint, request
+
+from .auth import auth_required
+from .func import error_return, success_return
+
+bp = Blueprint('present', __name__, url_prefix='/present')
+
+
+@bp.route('/me', methods=['GET'])  # 用户奖励信息
+@auth_required(request)
+def present_info(user_id):
+    with Connect() as c:
+        try:
+            x = UserPresentList(c, UserOnline(c, user_id))
+            x.select_user_presents()
+
+            return success_return(x.to_dict())
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/me/claim/<present_id>', methods=['POST'])  # 礼物确认
+@auth_required(request)
+def claim_present(user_id, present_id):
+    with Connect() as c:
+        try:
+            x = UserPresent(c, UserOnline(c, user_id))
+            x.claim_user_present(present_id)
+
+            return success_return()
+        except ArcError as e:
+            return error_return(e)
+    return error_return()