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General Support: Aditional comment SPAM protections (next to captcha)

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    Eventhough I'm using the captcha I was still getting spam in my comments section.

    To get rid of most of this I added a few extra pieces of code I also use in e-mail scripts etc.

    First of all the plogger/plog-comment.php file:

    at the start of the source code (after the <?php of course) add:

    //check if the data comes form the comment form's POST request
    if(isset($_POST['submit']))
    //if so, start the comment script
    {



    At the end of the source code (just before the ?>) add:

    }
    //end of the comment script

    //if the data does not come form the comment form's POST request
    else
    {
    die("<html><head>
    <title>403 Forbidden</title>
    </head><body>
    <h1>Forbidden</h1>
    <p>You don't have permission to directly access this page!</p>
    </body></html>
    ");
    }

    ?>

    This does an extra check to see if the posted data is actually coming from the comment form instead of direct injection by a spam bot.

    A second extra precaution would be to hide the comment form's submit button in a javacript document.write.

    A lot of spam bots use text based browsing and can't handle javascript, so if we write the submit button into a piece of javacript code they can't submit the form. The downside to this if people use a text based browser (a bit old fashioned imho) they can't submit a comment either.

    In your theme's comment.php file

    Replace


    <p><input class="submit" name="submit" type="submit" tabindex="5" value="<?php echo plog_tr('Post Comment'); ?>" /></p>


    by

    <p>
    <script language="JavaScript">
    document.write("<input class=\"submit\" name=\"submit\" type=\"submit\" tabindex=\"5\" value=\"<?php echo plog_tr('Post Comment'); ?>\" />");
    </script>
    </p>
    • CommentAuthornikeair01
    • CommentTimeNov 24th 2010
     
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  3.  
    If I look at the amount of spam on this forum I reckon it can use some extra precautions as well ;)

    ontopic: haven't had a single spam message since I've implemented the above. (against 5 a day)
    • CommentAuthorecspan
    • CommentTimeJul 12th 2011
     
    Great help, thank you! This should be added to future versions of the code.

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