From ad61786b0f317003586d175d0525094e63a782ca Mon Sep 17 00:00:00 2001 From: Saptak S Date: Fri, 8 Mar 2024 20:50:37 +0530 Subject: Allows only specific unicode characters for username Added a function to remove all characters apart from characters which fall under the unicode categories of letters and numbers. Also added a list of allowed special characters. --- cli/onionshare_cli/web/chat_mode.py | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/cli/onionshare_cli/web/chat_mode.py b/cli/onionshare_cli/web/chat_mode.py index 5a11eedd..dd151451 100644 --- a/cli/onionshare_cli/web/chat_mode.py +++ b/cli/onionshare_cli/web/chat_mode.py @@ -17,6 +17,7 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . """ +import unicodedata from flask import request, render_template, make_response, jsonify, session from flask_socketio import emit, ConnectionRefusedError @@ -47,11 +48,28 @@ class ChatModeWeb: self.define_routes() + def remove_unallowed_characters(self, text): + allowed_unicode_categories = [ + 'L', # All letters + 'N', # All numbers + ] + allowed_special_characters = [ + '-', # dash + '_', # underscore + ' ', # single space + ] + + def allowed_character(ch): + return unicodedata.category(ch)[0] in allowed_unicode_categories or ch in allowed_special_characters + + return "".join( + ch for ch in text if allowed_character(ch) + ) + def validate_username(self, username): - username = username.strip() + username = self.remove_unallowed_characters(username.strip()) return ( username - and username.isascii() and username not in self.connected_users and len(username) < 128 ) -- cgit v1.2.3-54-g00ecf