IMPLEMENTING CAPTCHA ON THE WEBSITE MEMBERSHIP PLUGIN 1.04+ SIGNUP FORM - Aug 18th, 2011
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NEW FOR MEMBERSHIP 1.04+
I wanted to use CAPTCHA validation on my membership signup form and although RE-CAPTCHA was pretty easy to implement, it
was a pretty intrusive addition to many web pages.
I discovered another alternative in a program called Captcha Creator. http://www.captchacreator.com/ They’re based in
Romania and their support is a bit spottier then I’d like. (I’ve grown accustomed to the exceptional support offered
by Interactive Tools) But now that I’ve been able to implement their program, I can format the Captcha display to fit
my page design and it works like a charm. Again, their program is not free, and an unlimited use license costs $50.
Implementing the “out of the box” version of Captcha Creator on my membership signup form was throwing a bunch of
“session already started” errors. The programmers at Captcha Creator revised the way the code was implemented on my
page and also made some changes in the captchac_lib.php file and a few others.
*** After you’ve uploaded the “captcha” directory to your server, download the revised files from
http://www.thecmsbcookbook.com/downloads/captcha_creator.zip and replace the ones in your “captcha” directory with
those.
On my existing membership signup form I changed CAPTCHA CREATOR’s Installation Step 2 code to better suit my design.
Instead of:
<table cellpadding=5 cellspacing=0 bgcolor="#E4F8E4">
<tr bgcolor="#AAD6AA">
<td colspan="2"><font color="#FFFFFF" face="Verdana" size="2"><b>Image Verification</b></font></td>
</tr>
<tr>
<td style="padding: 2px;" width="10"><img src="/captcha/captchac_code.php" id="captcha"></td>
<td valign="top"><font color="#000000">Please enter the text from the image</font> <br /> <input type="text"
name="Turing" value="" maxlength="100" size="10">
[ <a href="#" onclick=" document.getElementById('captcha').src = document.getElementById('captcha').src + '?' + (new
Date()).getMilliseconds()">Refresh Image</a> ] [ <a href="/captcha/whatisturing.html"
onClick="window.open('/captcha/whatisturing.html','_blank','width=400, height=300, left=' + (screen.width-450) + ',
top=100');return false;">What's This?</a> ]
</td>
</tr>
</table>
I used:
<table>
<tr>
<td valign="top"><span class="body-text-bold">CAPTCHA Image Verification</span><br /><br />
<span class="body-text">To help reduce spam, please type the characters in the image into the blank box before you
click on submit.<br />
</span> <br />
<a href="/captcha/whatisturing.html" onclick="window.open('/captcha/whatisturing.html','_blank','width=300,
height=300, left=' + (screen.width-450) + ', top=100');return false;">What is CAPTCHA?</a></td>
<td>
<table cellpadding=5 cellspacing=0 >
<tr>
<td style="padding: 5px;" width="300" height="100"><img src="/captcha/captchac_code.php" id="captcha"><br />
<a href="#" onclick=" document.getElementById('captcha').src = document.getElementById('captcha').src + '?' + (new
Date()).getMilliseconds()">Click to change the displayed characters</a><br /></td>
</tr>
<tr>
<td style="padding: 5px;"><input type="text" name="Turing" value="" maxlength="100" size="20" />
<br />
<br /> </td>
</tr>
</table></td></tr>
</table>
To make this all work in Membership 1.04+, at the top of the viewer I called the CAPTCHA program and checked for errors
with:
<?php
include_once('captcha/captchac_lib.php');
session_write_close ();
if (@$_REQUEST['submit']) {
$errorsAndAlerts = "";
if (!@$_REQUEST['Turing']) {$errorsAndAlerts .= "To help prevent spam, you must enter characters in the image into
the empty box below before submitting.<br /> <br /> \n";}
else
{
$Turing_code = $_REQUEST["Turing"];
if ( CheckCaptcha($Turing_code) !=1 ) { $errorsAndAlerts .= "The characters you entered do not match those
displayed. Please try again.<br /> <br /> \n";}
}
}
?>
And in the error checking code below I removed the clear errorsAndAlerts code line:
$errorsAndAlerts = "";
So that it only appeared once at the top of the viewer code. (Otherwise it will clear the captcha error messages
__
Don't forget to use "save" or "submit" consistently throughout your viewer code. I think you can use either one but I've
settled on submit.
__
*** LEGACY FOR MEMBERSHIP 1.03 AND EARLIER
In the error checking section of my page after:
//error checking
$errorsAndAlerts = "";
if (!@$_REQUEST['username']) { $errorsAndAlerts .= "You must choose a username!<br />\n"; }
I added this code:
if (!@$_REQUEST['Turing']) {$errorsAndAlerts .= "You must enter the CAPTCHA code!<br />\n";}
else
{
$Turing_code = $_REQUEST["Turing"];
if ( CheckCaptcha($Turing_code) !=1 ) { $errorsAndAlerts .= "The CAPTCHA code you entered does not match. Please try
again.<br />\n";}
}
For CAPTCHA CREATOR’s Installation Step 3 I replaced this:
<?php
include('captcha/captchac_lib.php');
$Turing_code = $_REQUEST["Turing"];
if ( CheckCaptcha($Turing_code) !=1 )
{
echo "<b><font color=red>The Captcha Code you entered is invalid. Please press the Back button of your browser
and try again</font></b>";
return 1;
}
?>
With this:
<?php
include_once('captcha/captchac_lib.php');
session_write_close ();
?>
So the complete code at the top of my viewer, above the error checking section looks like this:
<?php
include_once('captcha/captchac_lib.php');
session_write_close ();
?>
<?php
require_once "cmsAdmin/lib/viewer_functions.php";
?>
<?php if (!@$GLOBALS['WEBSITE_MEMBERSHIP_PLUGIN']) { die("You must activate the Website Membership plugin before you
can access this page."); } ?>
***(FOR V2.06 AND ABOVE SEE BELOW)***
_
NOTE: If you’ve updated to V2.06 you’ve probably discovered that the error checking at the top of the lib/init.php
file looks different, and pages using Captcha Creator are throwing errors again.
Well, thanks to CMSB User Djulia, the fix is in.
He discovered that when the function session_write_close (); is correctly written into the getRecords code at the top pf
your page, the errors disappear, without the need to modify the lib/init.php file.
Calling the Captcha program first, then closing the session, then calling the CMSB viewer_function is the implementation
that worked for me:
<?php
include_once('captcha/captchac_lib.php');
session_write_close ();
?>
<?php
require_once "cmsAdmin/lib/viewer_functions.php";
list($common_informationRecords, $common_informationMetaData) = getRecords(array(
'tableName' => 'common_information',
'where' => whereRecordNumberInUrl(1),
'limit' => '1',
));
$common_informationRecord = @$common_informationRecords[0]; // get first record
?>
<?php include_once "/path_to_your/spambot-email-protector.php" ?>
END LEGACY SECTION
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