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/others.py

@@ -0,0 +1,92 @@
+import json
+from urllib.parse import parse_qs, urlparse
+
+from core.download import DownloadList
+from core.error import ArcError
+from core.sql import Connect
+from core.system import GameInfo
+from core.user import UserOnline
+from flask import Blueprint, jsonify, request
+from werkzeug.datastructures import ImmutableMultiDict
+
+from .auth import auth_required
+from .func import error_return, success_return
+from .present import present_info
+from .purchase import bundle_pack
+from .score import song_score_friend
+from .user import user_me
+from .world import world_all
+
+bp = Blueprint('others', __name__)
+
+
+@bp.route('/game/info', methods=['GET'])  # 系统信息
+def game_info():
+    return success_return(GameInfo().to_dict())
+
+
+@bp.route('/serve/download/me/song', methods=['GET'])  # 歌曲下载
+@auth_required(request)
+def download_song(user_id):
+    with Connect() as c:
+        try:
+            x = DownloadList(c, UserOnline(c, user_id))
+            x.song_ids = request.args.getlist('sid')
+            x.url_flag = json.loads(request.args.get('url', 'true'))
+            x.clear_user_download()
+            if x.is_limited and x.url_flag:
+                raise ArcError('You have reached the download limit.', 903)
+
+            x.add_songs()
+            return success_return(x.urls)
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+map_dict = {'/user/me': user_me,
+            '/purchase/bundle/pack': bundle_pack,
+            '/serve/download/me/song': download_song,
+            '/game/info': game_info,
+            '/present/me': present_info,
+            '/world/map/me': world_all,
+            '/score/song/friend': song_score_friend}
+
+
+@bp.route('/compose/aggregate', methods=['GET'])  # 集成式请求
+def aggregate():
+    try:
+        #global request
+        finally_response = {'success': True, 'value': []}
+        #request_ = request
+        get_list = json.loads(request.args.get('calls'))
+        if len(get_list) > 10:
+            # 请求太多驳回
+            return error_return()
+
+        for i in get_list:
+            endpoint = i['endpoint']
+            request.args = ImmutableMultiDict(
+                {key: value[0] for key, value in parse_qs(urlparse(endpoint).query).items()})
+
+            resp_t = map_dict[urlparse(endpoint).path]()
+
+            if hasattr(resp_t, "response"):
+                resp_t = resp_t.response[0].decode().rstrip('\n')
+            resp = json.loads(resp_t)
+
+            if hasattr(resp, 'get') and resp.get('success') is False:
+                finally_response = {'success': False, 'error_code': 7, 'extra': {
+                    "id": i['id'], 'error_code': resp.get('error_code')}}
+                if "extra" in resp:
+                    finally_response['extra']['extra'] = resp['extra']
+                #request = request_
+                return jsonify(finally_response)
+
+            finally_response['value'].append(
+                {'id': i.get('id'), 'value': resp['value'] if hasattr(resp, 'get') else resp})
+
+        #request = request_
+        return jsonify(finally_response)
+    except KeyError:
+        return error_return()