Captcha integration in guestbook

glennl · March 19, 2007

Hi everyone,

I have a guestbook scripts which saves the entries in a text-file.

Here is the php-code (gb.php):

<?
  
  $amount=5;

  if ($_GET['action'] =='write') {


header('location: gb.php?action=read&start=0');
$file=fopen('gastenboek.txt','a');
$message=stripslashes($_GET['message']); 
$message=str_replace("\r",'',$message); 
$message=str_replace("\n",'{{',$message);

    fwrite($file,stripslashes($_GET['name']) .'|||'.$_GET['email'].'|||'.date('d-m-Y').'|||'.$_GET['url'].'|||'.$message."\n");
    fclose($file);
    
  }

  $start=(isset($_GET['start'])?$_GET['start']:0);
  $gastenboek=Array();
  $gastenboek=file('gastenboek.txt');

?>
<?php
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Mon, 19 Jul 1997 05:00:00 GMT"); // Date in the past
?> 

<SCRIPT language="JavaScript">

var form_submitted = false;

function validate(form) {

if (form.name.value=="") {
        alert("You forgot your name!");
        return false;
      } 

      else if (form.message.value=="") {
        alert("You forgot your message!");
        return false;
       }

      else if (form.email.value=="") {
        alert("You forgot your e-mail!");
        return false;
       }


  if ( form_submitted )
  {
    alert ( "Your form has already been submitted. Please wait..." );
    return false;
  }
  else
  {
    form_submitted = true;
    return true;
  }

      

    }
    </SCRIPT>


<head>
<script type="text/javascript" src="dom-drag.js"></script>
<link href="css/styles.css" rel="stylesheet" type="text/css">


<title>guestbook</title>
</head>
<body bgcolor="#9E9583">
<script type="text/javascript">

//We wrap all the code in an object so that it doesn't interfere with any other code
var scroller = {
  init:   function() {

    //collect the variables
    scroller.docH = document.getElementById("content").offsetHeight;
    scroller.contH = document.getElementById("container").offsetHeight;
    scroller.scrollAreaH = document.getElementById("scrollArea").offsetHeight;
      
    //calculate height of scroller and resize the scroller div
    //(however, we make sure that it isn't to small for long pages)
    scroller.scrollH = (scroller.contH * scroller.scrollAreaH) / scroller.docH;
    //if(scroller.scrollH < 15) scroller.scrollH = 15;
    document.getElementById("scroller").style.height = Math.round(scroller.scrollH) + "px";
    
    //what is the effective scroll distance once the scoller's height has been taken into account
    scroller.scrollDist = Math.round(scroller.scrollAreaH-scroller.scrollH);
    
    //make the scroller div draggable
    Drag.init(document.getElementById("scroller"),null,0,0,-1,scroller.scrollDist);
    
    //add ondrag function
    document.getElementById("scroller").onDrag = function (x,y) {
      var scrollY = parseInt(document.getElementById("scroller").style.top);
      var docY = 0 - (scrollY * (scroller.docH - scroller.contH) / scroller.scrollDist);
      document.getElementById("content").style.top = docY + "px";
    }
  }
}

onload = scroller.init;
</script>
<div id="scrollArea"><div id="scroller"></div></div>

<div id="container">

<div id="content"> 
<span class="redtitle">GUESTBOOK</span>
  <P>
  <TABLE width="258" cellspacing="0" cellpadding="0" >
      </TABLE>
  <TABLE width="258" cellspacing="0" cellpadding="0">
    <TR>
      <TD class="side"><i> Berichten <? echo $start+1; ?> tot <? echo min($start+$amount,sizeof($gastenboek)); ?>. Totaal van <? echo sizeof($gastenboek); ?> berichten.  </i>
        <HR> 

<TABLE width="258" cellspacing="0" cellpadding="1">


<?
          $gastenboek=array_reverse($gastenboek);
          for ($i=$start;$i<$start+$amount && $i<sizeof($gastenboek);$i++) {
            list($name,$email,$date,$url,$message)=explode('|||',$gastenboek[$i]);
            $message=str_replace('{{',"\n",$message);
      
            echo '
<TR><TD bgcolor="#5D5C48"><B>'.($email!=""?'<A href="mailto:'.$email.'">'.$name.'</A>':$name).'</td></TR>'."\n";

echo '<TR><TD bgcolor="#5D5C48" colspan=2>'.str_replace("\n",'<BR>',htmlspecialchars($message)).'<br></TD></TR>'."\n";

echo ($url!=""?'<tr><TD bgcolor="#5D5C48" colspan="2" align="left"><font size=1>  Homepage: <A href="'.$url.'" target="_blank">'.$url.'</A></font></TD></TR>':'')."\n";

echo'<tr><td bgcolor="#5D5C48" colspan=2><font size=1>Geplaatst op '.$date.'</font></td></tr>'."\n";


echo '<TR><TD colspan=2></TD></TR>'."\n";
echo '<TR><TD colspan=2></TD></TR>'."\n";
echo '<TR><TD colspan=2></TD></TR>'."\n";
echo '<TR><TD colspan=2></TD></TR>'."\n";
echo '<TR><TD colspan=2></TD></TR>'."\n";

          }
        ?>
        </TABLE>



        <CENTER>
          <?
          if ($start>0) echo '<A href="gb.php?start='.max(0,$start-$amount).'" class="a"><< vorige pagina </A> --  ';
          if ($start+$amount<sizeof($gastenboek)) echo ' <A href="gb.php?start='.($start+$amount).'" class="a">volgende pagina >></A>';
        ?>   </CENTER></TD>
    </TR>
  </TABLE>
  <P>
  <TABLE width="258" cellspacing="0" cellpadding="0" >
    <TR>
      <TD class="side"><span class="redtitle">PLAATS NIEUW BERICHT</span></TD>
    </TR>
  </TABLE>
  <TABLE width="258" cellspacing="0" cellpadding="0" >
    <TR>
      <TD class="side">

<FORM action="gb.php" method="GET" onSubmit="return validate(this);">
    


      <INPUT type="hidden" name="action" value="write">
          <TABLE class="side">
            <TR>
              <TD>Naam:</TD>
              <TD><INPUT type="text" name="name" size="30"></TD>
            </TR>
            <TR>
              <TD>E-Mail:</TD>
              <TD><INPUT type="text" name="email" size="30">
                </TD>
            </TR>
            <TR>
              <TD>Homepage:</TD>
              <TD><INPUT name="url" type="text"  size="30">
                (optional)</TD>
            </TR>
            <TR>
              <TD>Bericht:</TD>
              <TD><TEXTAREA name="message" cols="40" rows="5"></TEXTAREA></TD>
            </TR>
          </TABLE>


<input type="submit" name="submit" value="Plaats in gastenboek...">


          
        </FORM>


</TD>
    </TR>
  </TABLE>

</div>
</div>
<br>
</body>
</html>

Now, I want to insert a captcha in the form.

My captcha image is created with captcha.php and this works.

But now, I have to integrate the validation in my guestbook-script and there I have problems.

I need an extra field like this:

<input class="input" type="text" name="norobot">
<img src="captcha.php">

And now, I have to integrate this code somewhere in my gb.php:

<?php
session_start();

$redirect= $_POST['referer'];
if (md5($_POST['norobot']) == $_SESSION['randomnr2'])

{ // no fail

echo "no robot";
}

else

{ // failed

echo "robot!";

}
?>

Can someone help me please, I'm still learning PHP...

Thanks!

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Captcha integration in guestbook

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