sibtracker/system/classes/captcha.class.php
2019-05-18 13:46:03 +08:00

211 lines
7.2 KiB
PHP

<?php
class captcha{
var $alphabet = "0123456789"; // ÍÅ ÈÇÌÅÍßÉÒÅ, åñëè âû íå èçìåíÿëè ôàéë øðèôòîâ!
var $fontsdir = 'fonts';
var $width = 120;
var $height = 50;
var $fluctuation_amplitude = 2;
var $no_spaces = false;
var $jpeg_quality = 70; // ìàêñèìàëüíîå, ìîæíî ïîñòàâèòü 70-80
var $keystring = ''; // êëþ÷åâàÿ ãåíåðèðóåìàÿ ñòðîêà
var $allowed_symbols = "0123456789"; // èñïîëüçóåìûå öèôðû
var $length_min = 3; // ìèíèìàëüíîå
var $length_max = 3; // ìàêñèìàëüíîå
var $length = 0; // äëèíà áóäåò ñãåíåðèðîâàíà
function genstring() {
$length = mt_rand( $this->length_min, $this->length_max );
$this->length = $length;
$this->keystring = '';
for ($i = 0; $i < $length ; $i++) {
// â öèêëå äîáàâëÿåì ê ñòðîêå ïî 1 ñëó÷àéíîìó ñèìâîëó
$this->keystring .= $this->allowed_symbols{ mt_rand( 0, strlen( $this->allowed_symbols ) -1 ) };
}}
function genimage() {
$foreground_color = array( 100, 130, 200 );
$background_color = array( 255, 255, 255 );
$fonts = array();
$fontsdir_absolute = dirname( __FILE__ ).'/'.$this->fontsdir; // ïóòü ê ïàïêå ñ øðèôòàìè
if ($handle = opendir( $fontsdir_absolute )) { // ñîçäàåì ìàññèâ ñ ïîëíûìè ïóòÿìè ê èçîáðàæåíèÿì ñ øðèôòàìè
while (false !== ($file = readdir( $handle ))) {
if (preg_match( '/\.png$/i', $file )) {
$fonts[] = $fontsdir_absolute.'/'.$file;
}}
closedir( $handle );
}
$alphabet_length = strlen( $this->alphabet );
while (true) {
$font_file = $fonts[mt_rand( 0, count( $fonts ) - 1 )];
$font = imagecreatefrompng( $font_file );
$black = imagecolorallocate( $font, 0, 0, 0 );
$fontfile_width = imagesx( $font );
$fontfile_height = imagesy( $font ) - 1;
$font_metrics = array();
$symbol = 0;
$reading_symbol = false;
// çàãðóçêà øðèôòà
for ($i = 0; $i < $fontfile_width && $symbol < $alphabet_length; $i++) {
$transparent = (imagecolorat( $font, $i, 0 ) >> 24) == 127;
if (!$reading_symbol && !$transparent) {
$font_metrics[$this->alphabet{$symbol}] = array( 'start' => $i );
$reading_symbol = true;
continue;
}
if ($reading_symbol && $transparent) {
$font_metrics[$this->alphabet{$symbol}]['end'] = $i;
$reading_symbol = false;
$symbol++;
continue;
}
}
$img = imagecreatetruecolor( $this->width, $this->height );
$white = imagecolorallocate( $img, 100, 130, 200 );
$black = imagecolorallocate( $img, 100, 130, 200 );
imagefilledrectangle( $img, 0, 0, $this->width - 1, $this->height - 1, $white );
// íàíåñåíèå òåêñòà
$x = 1;
$shift = 0;
for ($i = 0; $i < $this->length; $i++) {
$m = $font_metrics[$this->keystring{$i}];
$y = mt_rand( -$this->fluctuation_amplitude, $this->fluctuation_amplitude ) + ($this->height - $fontfile_height) / 2 + 2;
if ($this->no_spaces) {
$shift = 0;
if ($i > 0) {
$shift = 1000;
for ($sy = 1; $sy < $fontfile_height - 15; $sy += 2) {
for ($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 + $y;
for ($px = min( $left, $this->width - 1 ); $px > $left - 20 && $px >= 0; $px--) {
$color = imagecolorat( $img, $px, $py ) & 0xff;
if ($color + $opacity < 190) {
if ($shift > $left-$px) {
$shift = $left - $px;
}
break;
}
}
break;
}
}
}
}
} else {$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 < $this->width - 10) break; // fit in canvas
}
$center = $x/2;
$img2=imagecreatetruecolor($this->width, $this->height);
$foreground=imagecolorallocate($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, $this->height, $this->width, $this->height+12, $foreground);
// ïåðèîäû
$rand1 = 0;
$rand2 = 0;
$rand3 = 0;
$rand4 = 0;
// ôàçû
$rand5 = 0;
$rand6 = 0;
$rand7 = 0;
$rand8 = 0;
// àìïëèòóäû
$rand9 = 0;
$rand10 = 0;
//âîëíîâîå èñêàæåíèå
for ($x = 0; $x < $this->width; $x++) {
for ($y = 0; $y < $this->height; $y++) {
$sx = $x + (sin( $x * $rand1 + $rand5 ) + sin( $y * $rand3 + $rand6 )) * $rand9 - $this->width / 2 + $center + 1;
$sy = $y + (sin( $x * $rand2 + $rand7 ) + sin( $y * $rand4 + $rand8 )) * $rand10;
if ($sx < 0 || $sy < 0 || $sx >= $this->width - 1 || $sy >= $this->height - 1) {
$color = 200;
$color_x = 200;
$color_y = 200;
$color_xy = 200;
} 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 ) );
}}
# Ðàìêà
imageline( $img2, 0, 0, $this->width, 0, $foreground );
imageline( $img2, 0, 0, 0, $this->height, $foreground );
imageline( $img2, 0, $this->height-1, $this->width, $this->height-1, $foreground );
imageline( $img2, $this->width-1, 0, $this->width-1, $this->height, $foreground);
header( "Expires: Tue, 11 Jun 1985 05:00:00 GMT" );
header( "Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . " GMT" );
header( "Cache-Control: no-store, no-cache, must-revalidate" );
header( "Cache-Control: post-check=0, pre-check=0", false );
header( "Pragma: no-cache" );
if (function_exists ('imagepng')) {
header ('Content-type: image/png');
imagepng ($img2, null);
} elseif (function_exists ('imagegif')) {
header ('Content-type: image/gif');
imagegif ($img2, null);
} elseif (function_exists('imagejpeg')) {
header( "Content-Type: image/jpeg" );
imagejpeg($img2, null, $this->jpeg_quality);
}
imagedestroy($img2);
}
}
?>