'InputCaptcha',
':html' => "
",
':args' => array('value'),
'size' => 5,
'autocomplete' => 'off',
'name' => $CaptchaName,
));
array_unshift($EditFunctions, 'RequireCaptcha');
SDV($HandleActions['captchaimage'], 'HandleCaptchaImage');
SDV($HandleAuth['captchaimage'], 'read');
function RequireCaptcha($pagename, $page, $new) {
global $EnablePostCaptchaRequired, $MessagesFmt,
$CaptchaRequiredFmt, $EnablePost;
if (!IsEnabled($EnablePostCaptchaRequired, 0)) return;
if (IsCaptcha()) return;
SDV($CaptchaRequiredFmt,
"$[Must enter valid code]
");
$MessagesFmt[] = $CaptchaRequiredFmt;
$EnablePost = 0;
}
function IsCaptcha() {
global $IsCaptcha, $CaptchaName, $EnableCaptchaSession;
if (isset($IsCaptcha)) return $IsCaptcha;
$key = @$_POST['captchakey'];
$resp = @$_POST[$CaptchaName];
$sid = session_id();
@session_start();
if ($key && $resp && @$_SESSION['captcha-challenges'][$key] == $resp)
$IsCaptcha = 1;
if (IsEnabled($EnableCaptchaSession, 0)) {
$IsCaptcha |= @$_SESSION['iscaptcha'];
@$_SESSION['iscaptcha'] = $IsCaptcha;
}
$IsCaptcha = (int)@$IsCaptcha;
if (!$sid) session_write_close();
return $IsCaptcha;
}
function InputCaptcha($pagename, $type, $args) {
CaptchaValue();
return Keep(InputToHTML($pagename, $type, $args, $opt));
}
function CaptchaValue() {
global $CaptchaKey, $CaptchaValue;
if ($CaptchaKey > '' &&
@$_SESSION['captcha-challenges'][$CaptchaKey] == $CaptchaValue)
return $CaptchaValue;
$sid = session_id();
@session_start();
if ($CaptchaKey == '') $CaptchaKey = count(@$_SESSION['captcha-challenges']);
$_SESSION['captcha-challenges'][$CaptchaKey] = $CaptchaValue;
if (!$sid) session_write_close();
return $CaptchaValue;
}
function CaptchaFn($pagename) {
global $CaptchaChallenge, $EnableCaptchaImage;
if (@$CaptchaChallenge) return $CaptchaChallenge;
if ($EnableCaptchaImage) return CaptchaImageTag($pagename);
return CaptchaValue();
}
function CaptchaImageTag($pagename) {
global $CaptchaKey,$CaptchaImageFmt, $EnableEmbeddedCaptcha;
CaptchaValue();
$key = @$CaptchaKey;
if ($key == '') return '';
@session_start();
$value = @$_SESSION['captcha-challenges'][$key];
if (!$value) return '';
if($EnableEmbeddedCaptcha == 1){
$jpgimg = CaptchaImage($pagename,"$key","$value");
$base64img = base64_encode($jpgimg);
$imgstr = "data:image/jpg;base64,".$base64img;
SDV($CaptchaImageFmt, "![](".$imgstr.")
");
}
if($EnableEmbeddedCaptcha == 0)
SDV($CaptchaImageFmt, "![]({\$PageUrl}?action=captchaimage&"
."captchakey={\$CaptchaKey})
");
return Keep(FmtPageName($CaptchaImageFmt, $pagename));
}
function CaptchaImage($pagename,$keyc,$valc) {
$key = $keyc;
$val = $valc;
$width = 60;
$height = 22;
$fontwidth = 10;
$fontheight = 14;
$img = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($img, 240, 240, 240);
imagefilledrectangle($img, 0, 0, $width, $height, $white);
imagealphablending($img, 1);
imagecolortransparent($img);
for($i=0; $i < 100; $i++) {
$r = rand(200, 255); $g = rand(200, 255); $b = rand(200, 255);
$color = imagecolorallocate($img, $r, $g, $b);
imagefilledellipse($img, round(rand(0, $width)), round(rand(0, $height)),
round(rand(0, $width/8)), round(rand(0, $height/4)), $color);
}
$vlen = strlen($val);
$x = rand(2, $width/$vlen);
for($i=0; $i < $vlen; $i++) {
$y = rand(2, $height - $fontheight - 2);
$r = rand(0, 150); $g = rand(0, 150); $b = rand(0, 150);
$fg = imagecolorallocatealpha($img, $r, $g, $b, 30);
$c = substr($val, $i, 1);
imagechar($img, 5, $x, $y, $c, $fg);
$x += rand($fontwidth + 2, ($width-$x)/($vlen-$i));
}
ob_start();
imagejpeg($img);
$jpgimg = ob_get_contents();
ob_end_clean();
return "$jpgimg";
}
function HandleCaptchaImage($pagename, $auth = 'read') {
global $CaptchaImage;
$key = @$_REQUEST['captchakey'];
if ($key == '') return '';
@session_start();
$value = @$_SESSION['captcha-challenges'][$key];
if (!$value) return '';
$img = CaptchaImage($pagename,$key,$value);
header('Content-type: image/jpeg');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Expires: Tue, 01 Jan 2002 00:00:00 GMT');
echo $img;
return;
}