Файл: core/classes/captcha.class.php
Строк: 207
<?php
class KCAPTCHA {
function KCAPTCHA( $type ) {
global $kcaptcha;
if (!isset($_SESSION['kcaptcha']['background_color']) || !isset($_SESSION['kcaptcha']['foreground_color'])) {
// цвета изображения CAPTCHA (RGB, 0-255)
$foreground_color = array( mt_rand( 0, 100 ), mt_rand( 0, 100 ), mt_rand( 0, 100 ) );
$background_color = array( mt_rand( 200, 255 ), mt_rand( 200, 255 ), mt_rand( 200, 255 ) ); // фон всегда светлее
}
else {
$foreground_color = $_SESSION['kcaptcha']['foreground_color'];
$background_color = $_SESSION['kcaptcha']['background_color'];
}
$alphabet = '0123456789abcdefghijklmnopqrstuvwxyz';
$allowed_symbols = '0123456789';
$fontsdir = 'captcha';
$length = 3;
$width = 90;
$height = 45;
$fluctuation_amplitude = 5;
$no_spaces = true;
$show_credits = false;
$credits = '';
$jpeg_quality = 75;
$fonts = array();
$fontsdir_absolute = $_SERVER['DOCUMENT_ROOT'] . '/images/' . $fontsdir;
if (is_dir($fontsdir_absolute)) {
if ($handle = opendir($fontsdir_absolute)) {
while(false !== ($file = readdir($handle))) {
if (preg_match('/.png$/i', $file)) {
$fonts[] = $fontsdir_absolute . '/' .$file;
}
}
closedir($handle);
}
else { exit(); }
}
else { exit(); }
$alphabet_length = strlen($alphabet);
while( true )
{
while( true )
{
$this->keystring = '';
for ($i = 0; $i < $length; $i++)
{
$this->keystring .= $allowed_symbols{rand(0, strlen($allowed_symbols) - 1)};
}
if( !preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp/', $this->keystring) ) break;
}
$_SESSION['captcha_key'] = isset( $_SESSION['captcha_key'] ) ? $_SESSION['captcha_key'] : NULL;
if( $_SESSION['captcha_key'] !== NULL )
{
$this->keystring = $_SESSION['captcha_key'];
}
$font_file = $fonts[array_rand($fonts)];
$font = imagecreatefrompng($font_file);
imagealphablending($font, true);
$fontfile_width = imagesx($font);
$fontfile_height = imagesy($font) - 1;
$font_metrics = array();
$symbol = 0;
$reading_symbol = false;
for($i = 0; $i < $fontfile_width && $symbol < $alphabet_length; $i++)
{
$transparent = (imagecolorat($font, $i, 0) >> 24) == 127;
if (!$reading_symbol && !$transparent)
{
$font_metrics[$alphabet[$symbol]]=array('start' => $i);
$reading_symbol = true;
continue;
}
if($reading_symbol && $transparent)
{
$font_metrics[$alphabet[$symbol]]['end'] = $i;
$reading_symbol = false;
$symbol++;
continue;
}
}
$img = imagecreatetruecolor($width, $height);
imagealphablending($img, true);
$white = imagecolorallocate($img, 255, 255, 255);
$black = imagecolorallocate($img, 0, 0, 0);
imagefilledrectangle($img, 0, 0, $width - 1, $height - 1, $white);
$x = 1;
for($i = 0; $i < $length; $i++)
{
$m = $font_metrics[$this->keystring[$i]];
$y = rand(-$fluctuation_amplitude, $fluctuation_amplitude) + ($height - $fontfile_height)/2 + 2;
if( $no_spaces )
{
$shift = 0;
if ($i > 0)
{
$shift = 1000;
for($sy = 7; $sy < $fontfile_height - 20; $sy++)
{
for($sx = $m['start'] - 1; $sx < $m['end']; $sx++)
{
$rgb = imagecolorat($font, $sx, $sy);
$opacity = $rgb >> 24;
if ($opacity < 127)
{
$left = $sx - $m['start'] + $x;
$py = $sy + $y;
if ($py > $height) break;
for($px = min($left, $width - 1); $px > $left - 12 && $px >= 0; $px--)
{
$color = imagecolorat($img, $px, $py) & 0xff;
if ($color + $opacity < 190)
{
if ($shift > $left - $px)
{
$shift = $left - $px;
}
break;
}
}
break;
}
}
}
if ($shift == 1000) $shift = rand(4,6);
}
}
else $shift = 1;
imagecopy($img, $font, $x - $shift, $y, $m['start'], 1, $m['end'] - $m['start'], $fontfile_height);
$x += $m['end'] - $m['start'] - $shift;
}
if ($x < $width - 10) break;
}
$center = $x/2;
$img2 = imagecreatetruecolor($width, $height + ($show_credits ? 12 : 0));
$foreground = imagecolorallocate($img2, $foreground_color[0], $foreground_color[1], $foreground_color[2]);
$background = imagecolorallocate($img2, $background_color[0], $background_color[1], $background_color[2]);
imagefilledrectangle($img2, 0, $height, $width - 1, $height + 12, $foreground);
$credits = empty($credits) ? $_SERVER['HTTP_HOST'] : $credits;
imagestring($img2, 2, $width / 2 - imagefontwidth(2) * strlen($credits)/2, $height - 2, $credits, $background);
$rand1 = rand(750000,1200000)/10000000;
$rand2 = rand(750000,1200000)/10000000;
$rand3 = rand(750000,1200000)/10000000;
$rand4 = rand(750000,1200000)/10000000;
$rand5 = rand(0,3141592)/500000;
$rand6 = rand(0,3141592)/500000;
$rand7 = rand(0,3141592)/500000;
$rand8 = rand(0,3141592)/500000;
$rand9 = rand(330,420)/110;
$rand10 = rand(330,450)/110;
for($x = 0; $x < $width; $x++)
{
for($y = 0; $y < $height; $y++)
{
$sx = $x + (sin($x * $rand1 + $rand5) + sin($y * $rand3 + $rand6)) * $rand9 - $width / 2 + $center + 1;
$sy = $y + (sin($x * $rand2 + $rand7) + sin($y * $rand4 + $rand8)) * $rand10;
if ($sx < 0 || $sy < 0 || $sx >= $width - 1 || $sy >= $height - 1)
{
$color = 255;
$color_x = 255;
$color_y = 255;
$color_xy = 255;
}
else
{
$color = imagecolorat($img, $sx, $sy) & 0xFF;
$color_x = imagecolorat($img, $sx + 1, $sy) & 0xFF;
$color_y = imagecolorat($img, $sx, $sy + 1) & 0xFF;
$color_xy = imagecolorat($img, $sx + 1, $sy + 1) & 0xFF;
}
if ($color == 0 && $color_x == 0 && $color_y == 0 && $color_xy == 0)
{
$newred = $foreground_color[0];
$newgreen = $foreground_color[1];
$newblue = $foreground_color[2];
}
else if ($color == 255 && $color_x == 255 && $color_y == 255 && $color_xy == 255)
{
$newred = $background_color[0];
$newgreen = $background_color[1];
$newblue = $background_color[2];
}
else
{
$frsx = $sx - floor($sx);
$frsy = $sy - floor($sy);
$frsx1 = 1 - $frsx;
$frsy1 = 1 - $frsy;
$newcolor = (
$color * $frsx1 * $frsy1 +
$color_x * $frsx * $frsy1 +
$color_y * $frsx1 * $frsy +
$color_xy * $frsx * $frsy);
if ($newcolor > 255) $newcolor = 255;
$newcolor = $newcolor / 255;
$newcolor0 = 1 - $newcolor;
$newred = $newcolor0 * $foreground_color[0] + $newcolor * $background_color[0];
$newgreen = $newcolor0 * $foreground_color[1] + $newcolor * $background_color[1];
$newblue = $newcolor0 * $foreground_color[2] + $newcolor * $background_color[2];
}
imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newred, $newgreen, $newblue));
}
}
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-cache, must-relative');
switch($type) {
case 'gif':
header('Content-Type: image/gif');
imagegif($img2);
break;
case 'jpg':
header('Content-Type: image/jpeg');
imagejpeg($img2, NULL, $jpeg_quality);
break;
case 'png':
header('Content-Type: image/x-png');
imagepng($img2);
break;
}
}
function getKeyString() {
return $this->keystring;
}
}
?>