cfg = $cfg;
$this->can_bypass = !empty($_POST[$this->cfg['secret_key']]);
$this->curr_code_key = $this->get_key_name(TIMENOW);
$this->prev_code_key = $this->get_key_name(TIMENOW - $this->key_ttl);
}
function verify_code ()
{
// обход
if ($this->can_bypass || $this->cfg['disabled'])
{
if (!empty($_POST[$this->cfg['secret_key']])) log_get('cap/off', @$_POST['login_username']);
return true;
}
// cap_sid
if (isset($_POST[$this->cap_sid_key]) && verify_id($_POST[$this->cap_sid_key], $this->cap_sid_len))
{
$this->cap_sid_val = $_POST[$this->cap_sid_key];
}
else
{
return false;
}
// code
$entered_code = '';
if (isset($_POST[$this->curr_code_key]))
{
$entered_code = (string) $_POST[$this->curr_code_key];
}
else if (isset($_POST[$this->prev_code_key]))
{
$entered_code = (string) $_POST[$this->prev_code_key];
}
$entered_code = strtolower(trim($entered_code));
$valid_code = $this->get_code();
if ($entered_code === $valid_code)
{
$this->del_sid();
return true;
}
else
{
$this->del_sid();
return false;
}
}
function get_html ()
{
if ($this->cfg['disabled']) return '';
$this->gen_cap_sid();
$this->new_img_url = $this->get_img_url($this->new_cap_id);
$this->new_code_key = $this->get_key_name(TIMENOW);
return '
';
}
function get_code ()
{
if ($this->cap_sid_val AND $code = CACHE('bb_cap_sid')->get('c_sid_'. $this->cap_sid_val))
{
return strtolower(trim($code));
}
else
{
return null;
}
}
function del_sid ()
{
if ($this->cap_sid_val)
{
CACHE('bb_cap_sid')->rm('c_sid_'. $this->cap_sid_val);
}
}
function gen_cap_sid ()
{
$row = DB('cap')->fetch_row("SELECT MIN(cap_id) AS min_id, MAX(cap_id) AS max_id FROM ". BB_CAPTCHA ." WHERE cap_id > 0");
$min_id = intval($row['min_id']) + $this->new_per_minute;
$max_id = intval($row['max_id']);
$this->new_cap_id = ($min_id < $max_id) ? mt_rand($min_id, $max_id) : $max_id;
$this->new_cap_code = (string) DB('cap')->fetch_row("SELECT cap_code FROM ". BB_CAPTCHA ." WHERE cap_id = {$this->new_cap_id}", 'cap_code');
$this->new_cap_sid = make_rand_str($this->cap_sid_len);
CACHE('bb_cap_sid')->set('c_sid_'. $this->new_cap_sid, $this->new_cap_code, $this->key_ttl*2);
}
function get_img_url ($id)
{
return $this->get_path($id, $this->cfg['img_url']);
}
function get_img_path ($id)
{
return $this->get_path($id, $this->cfg['img_path']);
}
function get_path ($id, $base)
{
$path = $base . ($id % 50) .'/'. $id .'.'. $this->img_ext;
return preg_replace("#/($id)(\.{$this->img_ext})\$#", '/'. md5($this->cfg['secret_key'] . md5($id)) .'$2', $path);
}
/**
* Генерит валидное имя ключа для получения введенного кода капчи из $_POST
*/
function get_key_name ($tm)
{
return 'cap_code_'. md5($this->cfg['secret_key'] . md5($tm - ($tm % $this->key_ttl)));
}
}
class captcha_kcaptcha extends captcha_common
{
// generates keystring and image
function gen_img ($cap_id)
{
global $bb_cfg;
// do not change without changing font files!
$alphabet = "0123456789abcdefghijklmnopqrstuvwxyz";
# symbols used to draw CAPTCHA - alphabet without similar symbols (o=0, 1=l, i=j, t=f)
$allowed_symbols = "23456789abcdeghkmnpqsuvxyz";
# folder with fonts
$fontsdir = INC_DIR .'captcha/kcaptcha/fonts/';
$fonts = array(
'antiqua.png',
'baskerville.png',
'batang.png',
'bookman.png',
'calisto.png',
'cambria.png',
'centaur.png',
'century.png',
'chaparral.png',
'constantia.png',
'footlight.png',
'garamond.png',
'georgia.png',
'goudy_old.png',
'kozuka.png',
'lucida.png',
'minion.png',
'palatino.png',
'perpetua.png',
'rockwell.png',
'times.png',
'warnock.png',
);
# CAPTCHA string length
$length = mt_rand($this->cap_min_chars, $this->cap_max_chars);
# CAPTCHA image size (you do not need to change it, whis parameters is optimal)
$width = 120;
$height = 60;
# symbol's vertical fluctuation amplitude divided by 2
$fluctuation_amplitude = 5;
# increase safety by prevention of spaces between symbols
$no_spaces = true;
# show credits
$show_credits = true; # set to false to remove credits line. Credits adds 12 pixels to image height
$credits = $bb_cfg['server_name']; # if empty, HTTP_HOST will be shown
# CAPTCHA image colors (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));
# JPEG quality of CAPTCHA image (bigger is better quality, but larger file size)
$jpeg_quality = 90;
$alphabet_length=strlen($alphabet);
do{
// generating random keystring
while(true){
$this->keystring='';
for($i=0;$i<$length;$i++){
$this->keystring.=$allowed_symbols[mt_rand(0,strlen($allowed_symbols)-1)];
}
if(!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/', $this->keystring)) break;
}
$font_file = $fontsdir . $fonts[mt_rand(0, count($fonts)-1)];
$font=imagecreatefrompng($font_file);
imagealphablending($font, true);
$fontfile_width=imagesx($font);
$fontfile_height=imagesy($font)-1;
$font_metrics=array();
$symbol=0;
$reading_symbol=false;
// loading font
for($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);
// draw text
$x=1;
for($i=0;$i<$length;$i++){
$m=$font_metrics[$this->keystring[$i]];
$y=mt_rand(-$fluctuation_amplitude, $fluctuation_amplitude)+($height-$fontfile_height)/2+2;
if($no_spaces){
$shift=0;
if($i>0){
$shift=10000;
for($sy=7;$sy<$fontfile_height-20;$sy+=1){
for($sx=$m['start']-1;$sx<$m['end'];$sx+=1){
$rgb=imagecolorat($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-=1){
$color=imagecolorat($img, $px, $py) & 0xff;
if($color+$opacity<190){
if($shift>$left-$px){
$shift=$left-$px;
}
break;
}
}
break;
}
}
}
if($shift==10000){
$shift=mt_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;
}
}while($x>=$width-10); // while not fit in canvas
$center=$x/2;
// credits
$img2=imagecreatetruecolor($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, 0, $width-1, $height-1, $background);
imagefilledrectangle($img2, 0, $height, $width-1, $height+12, $foreground);
$credits=empty($credits)?$bb_cfg['server_name']:$credits;
imagestring($img2, 2, $width/2-imagefontwidth(2)*strlen($credits)/2, $height-2, $credits, $background);
// periods
$rand1=mt_rand(750000,1200000)/10000000;
$rand2=mt_rand(750000,1200000)/10000000;
$rand3=mt_rand(750000,1200000)/10000000;
$rand4=mt_rand(750000,1200000)/10000000;
// phases
$rand5=mt_rand(0,31415926)/10000000;
$rand6=mt_rand(0,31415926)/10000000;
$rand7=mt_rand(0,31415926)/10000000;
$rand8=mt_rand(0,31415926)/10000000;
// amplitudes
$rand9=mt_rand(330,420)/110;
$rand10=mt_rand(330,450)/110;
//wave distortion
for($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){
continue;
}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==255 && $color_x==255 && $color_y==255 && $color_xy==255){
continue;
}else if($color==0 && $color_x==0 && $color_y==0 && $color_xy==0){
$newred=$foreground_color[0];
$newgreen=$foreground_color[1];
$newblue=$foreground_color[2];
}else{
$frsx=$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));
}
}
$img_path = $this->get_img_path($cap_id);
file_write('', $img_path, null, true, true);
imagejpeg($img2, $img_path, $jpeg_quality);
imagedestroy($img2);
return $this->keystring;
}
}