[Enhance] Add limiter & Building API

- Add a custom limiter and use it for limiting users' download instead of using database
> So add a requirement `limits`.

- Fix a character's value
- Change the email max length to 64
- Change something about API's roles and powers
- Add an API endpoint for getting users' roles and powers

latest version/server/auth.py

@@ -54,11 +54,10 @@ def auth_required(request):
                 try:
                     user = UserAuth(c)
                     user.token = headers['Authorization'][7:]
-                    return view(user.token_get_id(), *args, **kwargs)
+                    user_id = user.token_get_id()
                 except ArcError as e:
                     return error_return(e)
-
-            return error_return()
+            return view(user_id, *args, **kwargs)
 
         return wrapped_view
     return decorator

latest version/server/others.py

@@ -12,7 +12,7 @@ from werkzeug.datastructures import ImmutableMultiDict
 from .auth import auth_required
 from .func import arc_try, error_return, success_return
 from .present import present_info
-from .purchase import bundle_pack, bundle_bundle
+from .purchase import bundle_bundle, bundle_pack
 from .score import song_score_friend
 from .user import user_me
 from .world import world_all
@@ -33,8 +33,7 @@ def download_song(user_id):
         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:
+        if x.url_flag and x.is_limited:
             raise ArcError('You have reached the download limit.', 903)
 
         x.add_songs()