DISCONTINUED: Further bot development is carried out here in Rust.

Perception Guardian

Telegram bot with image-emoji CAPTCHA challenge-response.

Features

• Show CAPTCHA for new members
• Ban channels (optional)
• Change bot language for a group (only English and Russian supported at the time)
• Set custom Welcome message

Configuration

Copy config.example.yaml to config.yaml. See comments for config settings descriptions.
No defaults, all config settings are mandatory.

Bot settings

Use /settings command to change bot settings for a group.

TODO

• validate "Welcome message" markup
• limit number of New Chat Members per minute, don't show captcha when limit has reached
• /vacuum command to search and delete "Deleted Account"s
• detect spam
• periodicly delete expired "ignore" set key/scores
• https://stackoverflow.com/questions/61419046/administrator-permissions-check-aiogram
• /stats command to show bot statistics: number of users passed/not passed captcha for group, etc.
• add more emoji

Resources

• Emoji Meanings Encyclopedia
• Different kinds of UTF symbols representing letters