access_by_lua_block {

local use_whitelist_ip		= %USE_WHITELIST_IP%
local use_whitelist_reverse	= %USE_WHITELIST_REVERSE%
local use_blacklist_ip		= %USE_BLACKLIST_IP%
local use_blacklist_reverse	= %USE_BLACKLIST_REVERSE%
local use_dnsbl			= %USE_DNSBL%
local use_antibot_cookie	= %USE_ANTIBOT_COOKIE%
local use_antibot_javascript	= %USE_ANTIBOT_JAVASCRIPT%
local use_antibot_captcha	= %USE_ANTIBOT_CAPTCHA%

-- include LUA code
local whitelist		= require "whitelist"
local blacklist		= require "blacklist"
local dnsbl		= require "dnsbl"
local cookie		= require "cookie"
local javascript	= require "javascript"
local captcha		= require "captcha"

-- antibot
local antibot_uri = "%ANTIBOT_URI%"

-- check if already in whitelist cache
if use_whitelist_ip and whitelist.ip_cached_ok() then
	ngx.exit(ngx.OK)
end
if use_whitelist_reverse and whitelist.reverse_cached_ok() then
	ngx.exit(ngx.OK)
end

-- check if already in blacklist cache
if use_blacklist_ip and blacklist.ip_cached_ko() then
	ngx.exit(ngx.HTTP_FORBIDDEN)
end
if use_blacklist_reverse and blacklist.reverse_cached_ko() then
	ngx.exit(ngx.HTTP_FORBIDDEN)
end

-- check if already in dnsbl cache
if use_dnsbl and dnsbl.cached_ko() then
	ngx.exit(ngx.HTTP_FORBIDDEN)
end

-- check if IP is whitelisted (only if not in cache)
if use_whitelist_ip and not whitelist.ip_cached() then
	if whitelist.check_ip() then
		ngx.exit(ngx.OK)
	end
end

-- check if reverse is whitelisted (only if not in cache)
if use_whitelist_reverse and not whitelist.reverse_cached() then
	if whitelist.check_reverse() then
		ngx.exit(ngx.OK)
	end
end

-- check if IP is blacklisted (only if not in cache)
if use_blacklist_ip and not blacklist.ip_cached() then
	if blacklist.check_ip() then
		ngx.exit(ngx.HTTP_FORBIDDEN)
	end
end

-- check if reverse is blacklisted (only if not in cache)
if use_blacklist_reverse and not blacklist.reverse_cached() then
	if blacklist.check_reverse() then
		ngx.exit(ngx.HTTP_FORBIDDEN)
	end
end

-- check if IP is in DNSBLs (only if not in cache)
if use_dnsbl and not dnsbl.cached() then
	if dnsbl.check() then
		ngx.exit(ngx.HTTP_FORBIDDEN)
	end
end

-- cookie check
if use_antibot_cookie then
	if not cookie.is_set("uri") then
		if ngx.var.request_uri ~= antibot_uri then
			cookie.set({uri = ngx.var.request_uri})
			return ngx.redirect(antibot_uri)
		end
		return ngx.exit(ngx.HTTP_FORBIDDEN)
	else
		if ngx.var.request_uri == antibot_uri then
			return ngx.redirect(cookie.get("uri"))
		end
	end
end

-- javascript check
if use_antibot_javascript then
	if not cookie.is_set("javascript") then
		if ngx.var.request_uri ~= antibot_uri then
			cookie.set({uri = ngx.var.request_uri, challenge = javascript.get_challenge()})
			return ngx.redirect(antibot_uri)
		end
	end
end

-- captcha check
if use_antibot_captcha then
	if not cookie.is_set("captcha") then
		if ngx.var.request_uri ~= antibot_uri and ngx.var.request_uri ~= "/favicon.ico" then
			cookie.set({uri = ngx.var.request_uri})
			return ngx.redirect(antibot_uri)
		end
	end
end

ngx.exit(ngx.OK)

}

%INCLUDE_ANTIBOT_JAVASCRIPT%

%INCLUDE_ANTIBOT_CAPTCHA%