function phorum_mod_spamhurdles_before_footer()
{
$PHORUM = $GLOBALS["PHORUM"];
// Only run this hook if we are handling a protected form.
if (!isset($PHORUM["SPAMHURDLES"]["shown_form"])) {
return;
}
$type = $PHORUM["SPAMHURDLES"]["shown_form"];
$conf = $PHORUM["mod_spamhurdles"];
// If we block quick posts, then disable the submit button temporarily
// to prevent the user from posting his message to early. This only
// applies to the message posting form.
if ($type == "posting" && do_spamhurdle("blockquickpost")) {
// See how long we should delay posting for the current user.
$spamhurdles = $PHORUM["SPAMHURDLES"];
$delay = $conf["key_min_ttl"] - (time() - $spamhurdles["create_time"]);
if ($delay < 0) {
$delay = 0;
}
?>
<script type="text/javascript">
//<![CDATA[
var poststr;
var secondsleft = <?php
print $delay;
?>
;;
var postbutton;
if (document.getElementById) {
var keyfld = document.getElementById("spamhurdles_key_field");
if (keyfld && keyfld.form) {
var f = keyfld.form;
if (f.finish) {
postbutton = f.finish;
poststr = postbutton.value;
spamhurdles_postdelay_countdown()
}
}
}
function spamhurdles_postdelay_countdown()
{
secondsleft --;
if (secondsleft <= 0) {
postbutton.value = poststr;
postbutton.disabled = false;
} else {
postbutton.value = poststr + "(" + secondsleft + ")";
postbutton.disabled = true;
setTimeout('spamhurdles_postdelay_countdown()', 1000);
}
}
//]]>
</script>
<?php
}
// Javascript MD5 signing check. This code will create the signed
// value, that will be checked when posting the form. This only
// applies to the message posting form.
if ($type == "posting" && do_spamhurdle("jsmd5check")) {
ob_start();
?>
<script>
//<![CDATA[
if (document.getElementById)
{
// Extract the signing key from the page.
var image = document.getElementById("spamhurdles_img");
var signkey = image.alt;
// Extract the key from the page.
var keyfld = document.getElementById("spamhurdles_key_field");
var key = keyfld.value;
// Create spamhurdles signature.
var signature = hex_md5(key + signkey);
// Create hidden form field on the fly for storing the signature.
var f = keyfld.form;
var fld = document.createElement("input");
fld.name = "spamhurdles_signature";
fld.type = "hidden";
fld.value = signature;
f.appendChild(fld);
}
//]]>
</script>
<?php
$html = ob_get_contents();
ob_end_clean();
print iScramble($html, FALSE, FALSE, '');
}
// Show a CAPTCHA if we have generated one before.
if (isset($PHORUM["SPAMHURDLES"]["captcha"])) {
print $PHORUM["SPAMHURDLES"]["captcha"]["html_after_form"];
}
}
function generate_captcha_html($question)
{
$PHORUM = $GLOBALS["PHORUM"];
$lang = $GLOBALS["PHORUM"]["DATA"]["LANG"]["mod_spamhurdles"];
// We only have upper case chars in our banner class.
$question = strtoupper($question);
// Create a bitmap for the generated question.
$banner = new banner();
$formatted = $banner->format($question);
// Extract all active pixels from the bitmap.
$points = array();
$rows = count($formatted);
$cols = strlen($formatted[0]);
foreach ($formatted as $row => $raster) {
for ($col = 0; $col < strlen($raster); $col++) {
if ($raster[$col] != ' ') {
$points[] = array($col, $row);
}
}
}
// Pixelsize.
$psx = 4;
$psy = 3;
// Generate the HTML content.
ob_start();
$captcha_h = ($rows + 3) * $psy;
$captcha_w = ($cols + 2) * $psx;
?>
<div style="overflow:hidden; position:relative; padding:0px; background-color: #fff; border: 1px solid black; width: <?php
print $captcha_w;
?>
px; height: <?php
print $captcha_h;
?>
px;" id="spamhurdles_captcha_image">
</div>
<?php
$captcha = ob_get_contents();
ob_end_clean();
ob_start();
?>
<script type="text/javascript">
function spamhurdles_captcha_add_pixel(x,y) {
if (!document.getElementById) return;
var captcha = document.getElementById("spamhurdles_captcha_image");
var pixel = document.createElement("div");
pixel.innerHTML = "<span></span>";
pixel.style.backgroundColor = randomcolor(20,130);
pixel.style.width = "<?php
print $psx;
?>
px";
pixel.style.height = "<?php
print $psy;
?>
px";
pixel.style.position = "absolute";
pixel.style.top = ((1+y)*<?php
print $psy;
?>
) + "px";
pixel.style.left = ((1+x)*<?php
print $psx;
?>
) + "px";
captcha.appendChild(pixel);
}
function spamhurdles_captcha_background() {
if (!document.getElementById) return;
var captcha = document.getElementById("spamhurdles_captcha_image");
captcha.style.backgroundColor = randomcolor(150,200);
var blockwidth = Math.ceil(<?php
print ($cols + 2) * $psx;
?>
/10);
for (i=0; i<10; i++) {
var block = document.createElement("div");
block.innerHTML = "<span></span>";
block.style.backgroundColor = randomcolor(100,230);
block.style.width = blockwidth + "px";
block.style.height = "<?php
print $captcha_h;
?>
px";
block.style.position = "absolute";
block.style.top = 0;
block.style.left = (blockwidth * i) + "px";
captcha.appendChild(block);
}
}
function randomcolor(min, max) {
r = min + Math.floor(Math.random()*(max-min)+1);
g = min + Math.floor(Math.random()*(max-min)+1);
b = min + Math.floor(Math.random()*(max-min)+1);
return "rgb("+r+","+g+","+b+")";
}
spamhurdles_captcha_background();
<?php
shuffle($points);
foreach ($points as $point) {
print "spamhurdles_captcha_add_pixel({$point[0]},{$point[1]});\n";
}
?>
</script>
<?php
$post = ob_get_contents();
ob_end_clean();
// Some extra scrambling to make things harder for spammers.
$captcha = iScramble($captcha, false, false, '<div id="spamhurdles_captcha_image">' . $lang["JavascriptCaptchaNoscript"] . '</div>');
$post = iScramble($post, false, false, "");
return array($captcha, $post);
}