Update to v2.8.6 without release

- Code refactoring
- Update the song database
- Fix a bug of the friend system which arose in the last version
- Fix a bug of duplicate calculating finishing states when players finish playing the chart in Link Play.

latest version/server/friend.py

@@ -0,0 +1,49 @@
+from flask import Blueprint, request
+from core.sql import Connect
+from core.error import ArcError
+from core.user import UserOnline, code_get_id
+from .func import error_return, success_return
+from .auth import auth_required
+
+bp = Blueprint('friend', __name__, url_prefix='/friend')
+
+
+@bp.route('/me/add', methods=['POST'])  # 加好友
+@auth_required(request)
+def add_friend(user_id):
+    with Connect() as c:
+        try:
+            friend_code = request.form['friend_code']
+            friend_id = code_get_id(c, friend_code)
+            user = UserOnline(c, user_id)
+            user.add_friend(friend_id)
+
+            return success_return({
+                "user_id": user.user_id,
+                "updatedAt": "2020-09-07T07:32:12.740Z",
+                "createdAt": "2020-09-06T10:05:18.471Z",
+                "friends": user.friends
+            })
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/me/delete', methods=['POST'])  # 删好友
+@auth_required(request)
+def delete_friend(user_id):
+    with Connect() as c:
+        try:
+            friend_id = int(request.form['friend_id'])
+            user = UserOnline(c, user_id)
+            user.delete_friend(friend_id)
+
+            return success_return({
+                "user_id": user.user_id,
+                "updatedAt": "2020-09-07T07:32:12.740Z",
+                "createdAt": "2020-09-06T10:05:18.471Z",
+                "friends": user.friends
+            })
+        except ArcError as e:
+            return error_return(e)
+    return error_return()