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/world.py

@@ -0,0 +1,56 @@
+from flask import Blueprint, request
+from core.error import ArcError
+from core.sql import Connect
+from core.user import UserOnline
+from core.world import UserMap, get_world_all
+from .func import error_return, success_return
+from .auth import auth_required
+
+bp = Blueprint('world', __name__, url_prefix='/world')
+
+
+@bp.route('/map/me', methods=['GET'])  # 获得世界模式信息，所有地图
+@auth_required(request)
+def world_all(user_id):
+    with Connect() as c:
+        try:
+            user = UserOnline(c, user_id)
+            user.select_user_about_current_map()
+            return success_return({
+                "current_map": user.current_map.map_id,
+                "user_id": user_id,
+                "maps": [x.to_dict(has_map_info=True, has_rewards=True) for x in get_world_all(c, user)]
+            })
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/map/me', methods=['POST'])  # 进入地图
+@auth_required(request)
+def world_in(user_id):
+    with Connect() as c:
+        try:
+            arcmap = UserMap(c, request.form['map_id'], UserOnline(c, user_id))
+            if arcmap.unlock():
+                return success_return(arcmap.to_dict())
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/map/me/<map_id>', methods=['GET'])  # 获得单个地图完整信息
+@auth_required(request)
+def world_one(user_id, map_id):
+    with Connect() as c:
+        try:
+            arcmap = UserMap(c, map_id, UserOnline(c, user_id))
+            arcmap.change_user_current_map()
+            return success_return({
+                "user_id": user_id,
+                "current_map": map_id,
+                "maps": [arcmap.to_dict(has_map_info=True, has_steps=True)]
+            })
+        except ArcError as e:
+            return error_return(e)
+    return error_return()