45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
location = %ANTIBOT_URI% {
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default_type 'text/html';
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if ($request_method = GET) {
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content_by_lua_block {
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local cookie = require "cookie"
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local captcha = require "captcha"
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if not cookie.is_set("uri") then
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ngx.log(ngx.NOTICE, "[ANTIBOT] captcha fail (1) for " .. ngx.var.remote_addr)
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return ngx.exit(ngx.HTTP_FORBIDDEN)
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end
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local img, res = captcha.get_challenge()
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cookie.set({captchares = res})
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local code = captcha.get_code(img, "%ANTIBOT_URI%")
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ngx.say(code)
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}
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}
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if ($request_method = POST) {
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access_by_lua_block {
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local cookie = require "cookie"
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local captcha = require "captcha"
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if not cookie.is_set("captchares") then
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ngx.log(ngx.NOTICE, "[ANTIBOT] captcha fail (2) for " .. ngx.var.remote_addr)
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return ngx.exit(ngx.HTTP_FORBIDDEN)
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end
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ngx.req.read_body()
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local args, err = ngx.req.get_post_args(1)
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if err == "truncated" or not args or not args["captcha"] then
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ngx.log(ngx.NOTICE, "[ANTIBOT] captcha fail (3) for " .. ngx.var.remote_addr)
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return ngx.exit(ngx.HTTP_FORBIDDEN)
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end
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local captcha_user = args["captcha"]
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local check = captcha.check(captcha_user, cookie.get("captchares"))
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if not check then
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ngx.log(ngx.NOTICE, "[ANTIBOT] captcha fail (4) for " .. ngx.var.remote_addr)
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return ngx.redirect("%ANTIBOT_URI%")
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end
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cookie.set({captcha = "ok"})
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return ngx.redirect(cookie.get("uri"))
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}
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}
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}
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