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Simple captcha for oscommerce contact form

Thu, 07/24/2008 - 21:52 — sandip

Embed the captcha image by calling a php script in "contact_us.php":

<input type="text" name="verify" />
<img src="/image.php" width="60" height="20" alt="Please enter the values from this image" />

Edit contact_us.php file and exactly after the below line:

  if (isset($HTTP_GET_VARS['action']) && ($HTTP_GET_VARS['action&#039;] == 'send')) {

place the verification code:

        // Captcha check
    &nbsp;   $t = trim($HTTP_POST_VARS['verify']);
    &nbsp;   if ($t == "") {
    &nbsp;    &nbsp;    &nbsp; $captcha_error = "Enter the verification code!";
    &nbsp;    &nbsp;    &nbsp; $error = true;
    &nbsp;    &nbsp;    &nbsp; $messageStack->add('contact', $captcha_error);
    &nbsp;   } else if (trim($_SESSION["thecode&quot;]) == "") {
    &nbsp;    &nbsp;    &nbsp; $captcha_error = "No verification code generated!";
    &nbsp;    &nbsp;    &nbsp; $error = true;
    &nbsp;    &nbsp;    &nbsp; $messageStack->add('contact', $captcha_error);
    &nbsp;   } else if ($_SESSION["thecode"] != strtoupper($t)) {
    &nbsp;    &nbsp;    &nbsp; $captcha_error = "Invalid verification code!";
    &nbsp;    &nbsp;    &nbsp; $error = true;
    &nbsp;    &nbsp;    &nbsp; $messageStack->add('contact', $captcha_error);
    &nbsp;   }
    &nbsp;   else
    &nbsp;   { // End Captcha Check

Here's the "image.php" file that produces a simple captcha image:

<?php
include_once(<span style="color: #DD0000">'includes/application_top.php');

function generate_verification() {
    &nbsp;   srand((double) style="color: #0000BB">microtime style="color: #007700">()*1000000);
    &nbsp;   $rand = rand(0,999999999 style="color: #007700">);
    &nbsp;   $thecode = substr(strtouppern style="color: #007700">(md5($rand)), 2, 5);
    &nbsp;   $thecode = str_replacean style="color: #007700">("O", "A", $thecode);
    &nbsp;   $thecode = str_replacean style="color: #007700">("0", "B", $thecode);
    &nbsp;   $_SESSION style="color: #007700">['thecode' style="color: #007700">] = $thecode;
}

generate_verification();
header("Content-type: image/png");
$image = imagecreatean style="color: #007700">(60,20);
$background_color = imagecolorallocate ($image, 219, 236, 255);
$blue = imagecolorallocatepan>($image, 0, 90, 190);
imagestringan style="color: #007700">($image,5,8,2,$_SESSION style="color: #007700">['thecode' style="color: #007700">],$blue);
imagepng($image);
imagedestroypan style="color: #007700">($image);
tep_session_register</span>('thecode' style="color: #007700">);
?>

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Sun, 11/17/2013 - 05:58 — Anonymous Thank you!

At last a captcha that is readable....

Sat, 10/24/2009 - 08:02 — Anonymous does work

hi, i tried this code it doesnt work when the email is correct it doesnt check the captcha

Thu, 04/09/2009 - 06:34 — Anonymous chinese oscommerce captcha problem

The captcha code works well in english oscommerce. But in chinese language, the verification code just not generated. Any idea? Thanks.

Fri, 02/06/2009 - 04:08 — Anonymous STpd Q

first of thanks for this little treasure! this is the only captcha i got working and i know it says "Simple" but is there a way to put a little bit of distractions on the captcha image generated? just a tiny bit more anti bot security.

Thu, 12/18/2008 - 19:25 — Anonymous Where the box to enter the code

Just wandering if there was a text box for the code to be typed into.

Fri, 12/19/2008 - 15:21 — sandip Yes, the text box should be

Yes, the text box should be as:

<input type="text" name="verify" />
<img src="/image.php" width="60" height="20" alt="Please enter the values from this image" />

Thanks for bring this up, I have modified the above instruction set and included the info.

Fri, 08/15/2008 - 16:50 — sandip There is the original code

There is the original code after the last else statement, that's why it is there.

Fri, 08/15/2008 - 15:14 — Anonymous Bug Fix

To many curlies, lol. Curly bracket needs to be removed for it to work.

else
// End Captcha Check

Sat, 10/03/2009 - 16:03 — Anonymous Doesn't work for me

Hi folks. Set this up. Capcha shows but if incorrect capcha used the email form is still processed.

G.L.

Mon, 12/14/2009 - 15:07 — Anonymous work perfectly ----> contact_us.php

----------------------------------------
if (isset($HTTP_GET_VARS['action']) && ($HTTP_GET_VARS['action&#039;] == 'send')) {


     // Captcha check
    &nbsp;   $t = trim($HTTP_POST_VARS['verify']);
    &nbsp;   if ($t == "") {
    &nbsp;    &nbsp;    &nbsp; $captcha_error = "Enter the verification code!";
    &nbsp;    &nbsp;    &nbsp; $error = true;
    &nbsp;    &nbsp;    &nbsp; $messageStack->add('contact', $captcha_error);
    &nbsp;   } else if (trim($_SESSION["thecode&quot;]) == "") {
    &nbsp;    &nbsp;    &nbsp; $captcha_error = "No verification code generated!";
    &nbsp;    &nbsp;    &nbsp; $error = true;
    &nbsp;    &nbsp;    &nbsp; $messageStack->add('contact', $captcha_error);
    &nbsp;   } else if ($_SESSION["thecode"] != strtoupper($t)) {
    &nbsp;    &nbsp;    &nbsp; $captcha_error = "Invalid verification code!";
    &nbsp;    &nbsp;    &nbsp; $error = true;
    &nbsp;    &nbsp;    &nbsp; $messageStack->add('contact', $captcha_error);
    &nbsp;   }
    &nbsp;   else
    &nbsp;   {     ;    // End Captcha Check

    $name = tep_db_prepare_input($HTTP_POST_VARS['name']);
    $email_address = tep_db_prepare_input($HTTP_POST_VARS['email']); />    $enquiry = tep_db_prepare_input($HTTP_POST_VARS['enquiry']);<br />   }
    if (tep_validate_email($email_address)) {
    &nbsp; tep_mail(STORE_OWNER, STORE_OWNER_EMAIL_ADDRESS, EMAIL_SUBJECT, $enquiry, $name, $email_address);

    &nbsp; tep_redirect(tep_href_link(FILENAME_CONTACT_US, 'action=success'));<br />    } else {
    &nbsp; $error = true;

    &nbsp; $messageStack->add('contact', ENTRY_EMAIL_ADDRESS_CHECK_ERROR);
    }
  }

  $breadcrumb->add(NAVBAR_TITLE, tep_href_link(FILENAME_CONTACT_US));
?>
--------------  and look for
<tr>
    &nbsp;   <td><table border="0" width="100%" cellspacing="1" cellpadding="2" class="infoBox"><br />    &nbsp;     <tr class="infoBoxContents&quot;>
    &nbsp;    &nbsp;  <td><table border="0" width="100%" cellspacing="0" cellpadding="2"><br />    &nbsp;    &nbsp;    <tr>
    &nbsp;    &nbsp;    &nbsp; <td width="10" align="right">an style="color: #000000"><?php echo tep_draw_separatorpan>('pixel_trans.gif'an>, '10', '1'); ?>r /><!--  insert here the input code and add "Input Secure Code"   &nbsp; ------ -->
    &nbsp;    &nbsp;    &nbsp;    &nbsp;    &nbsp;    &nbsp;     Input Secure Code: <input type="text" name="verify" />
<img src="image.php" width="60" height="20" alt="Please enter the values from this image" />
<!-- --------------------------------  -->
    &nbsp;    &nbsp;    &nbsp; </td>
    &nbsp;    &nbsp;    &nbsp; <td align="right">an style="color: #000000"><?php echo tep_image_submitn>('button_continue.gif', IMAGE_BUTTON_CONTINUE); ?>&lt;/td>
    &nbsp;    &nbsp;    &nbsp; <td width="10"><?php echo tep_draw_separatorpan>('pixel_trans.gif'an>, '10', '1'); ?>&lt;/td>
    &nbsp;    &nbsp;    </tr>
    &nbsp;    &nbsp;  </table>

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