reCAPTCHA

Using reCAPTCHA with Classic ASP

The reCAPTCHA ASP guide provides a simple way to place a CAPTCHA on your ASP page, helping you stop bots from abusing it. The code below wraps the reCAPTCHA API.

After you've signed up for your API keys, you can add reCAPTCHA to your classic ASP site by pasting the code below at the top of your ASP page:

  <%
  recaptcha_challenge_field  = Request("recaptcha_challenge_field")
  recaptcha_response_field   = Request("recaptcha_response_field")
  recaptcha_public_key       = "your_public_key" ' your public key
  recaptcha_private_key      = "your_private_key" ' your private key

  ' returns the HTML for the widget
  function recaptcha_challenge_writer()
recaptcha_challenge_writer = _ "<script type=""text/javascript"">" & _ "var RecaptchaOptions = {" & _ " theme : 'red'," & _ " tabindex : 0" & _ "};" & _ "</script>" & _ "<script type=""text/javascript"" src=""http://www.google.com/recaptcha/api/challenge?k=" & recaptcha_public_key & """></script>" & _ "<noscript>" & _ "<iframe src=""http://www.google.com/recaptcha/api/noscript?k=" & recaptcha_public_key & """ frameborder=""1""></iframe><>" & _ "<textarea name=""recaptcha_challenge_field"" rows=""3"" cols=""40""></textarea>" & _ "<input type=""hidden"" name=""recaptcha_response_field""value=""manual_challenge"">" & _ "</noscript>" end function ' returns "" if correct, otherwise it returns the error response function recaptcha_confirm(rechallenge,reresponse)
Dim VarString VarString = _ "privatekey=" & recaptcha_private_key & _ "&remoteip=" & Request.ServerVariables("REMOTE_ADDR") & _ "&challenge=" & rechallenge & _ "&response=" & reresponse Dim objXmlHttp Set objXmlHttp = Server.CreateObject("Msxml2.ServerXMLHTTP") objXmlHttp.open "POST", "http://www.google.com/recaptcha/api/verify", False objXmlHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded" objXmlHttp.send VarString
Dim ResponseString ResponseString = split(objXmlHttp.responseText, vblf) Set objXmlHttp = Nothing if ResponseString(0) = "true" then 'They answered correctly recaptcha_confirm = "" else 'They answered incorrectly recaptcha_confirm = ResponseString(1) end if end function server_response = "" newCaptcha = True if (recaptcha_challenge_field <> "" or recaptcha_response_field <> "") then server_response = recaptcha_confirm(recaptcha_challenge_field, recaptcha_response_field) newCaptcha = False end if %>

What happens here is the variables server_response and newCaptcha are set whenever the page is loaded, allowing you to determine the state of your page.

You can use the following HTML as a skeleton:

  <html>
  <body>

  <% if server_response <> "" or newCaptcha then %>

    <% if newCaptcha = False then %>

      <!-- An error occurred -->
      Wrong!

    <% end if %>

    <!-- Generating the form -->
    <form action="recaptcha.asp" method="post">
      <%=recaptcha_challenge_writer()%>
    </form>

  <% else %>

    <!-- The solution was correct -->
    Correct!

  <%end if%>

  </body>
  </html>

Further Reading

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