captcha.lua
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captcha.lua
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	--[[
	mattata v2.0 - Captcha Middleware
	Gates new members with captcha verification when enabled.
	The actual captcha challenge is handled by the join_captcha plugin.
	This middleware restricts unverified users from chatting.
	]]

	local captcha = {}
	captcha.name = 'captcha'

	local session = require('src.core.session')

	function captcha.run(ctx, message)
	if not ctx.is_group or not message.from then
	return ctx, true
	end

	-- Fast path: single EXISTS check (avoids 2 HGET calls for 99% of messages)
	local has_captcha = ctx.redis.exists('captcha:' .. message.chat.id .. ':' .. message.from.id)
	if has_captcha ~= 1 and has_captcha ~= true then
	return ctx, true
	end

	-- Slow path: user has pending captcha, fetch details
	local pending = session.get_captcha(message.chat.id, message.from.id)
	if not pending then
	return ctx, true
	end

	-- If user has pending captcha, only allow callback query responses (handled elsewhere)
	-- Block regular messages from unverified users
	if not message.new_chat_members then
	-- Delete the message from the unverified user
	pcall(function()
	ctx.api.delete_message(message.chat.id, message.message_id)
	end)
	return ctx, false
	end

	return ctx, true
	end

	return captcha