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
$form = 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
$after_form = ob_get_contents();
ob_end_clean();
// Some extra scrambling to make things harder for spammers.
$form = spamhurdles_iScramble($form, false, false, '<div id="spamhurdles_captcha_image">' . $lang["JavascriptCaptchaNoscript"] . '</div>');
$after_form = spamhurdles_iScramble($after_form, false, false, "");
return array($form, $after_form);
}
function spamhurdle_javascript_signature_build_after_form($data)
{
print spamhurdles_iScramble("<script type=\"text/javascript\">\n" . "spamhurdle_javascript_signature('{$data['sig'][0]}');\n" . "</script>\n");
return $data;
}
