/**
* Generates a captcha image
*
* @param string $id
* @param string $function
*/
public function captchaImage( $id, $function )
{
global $_PLUGINS;
if ( $id ) {
$absPath = $_PLUGINS->getPluginPath( $this->getPluginId() );
$captcha = cbantispamCaptcha::getInstance( $id, ( $function != 'image' ? $function : null ) );
$code = $captcha->getCaptchaCode();
if ( $this->input( 'ver', null, GetterInterface::STRING ) ) {
$code = $captcha->generateCode();
}
$height = (int) $this->params->get( 'captcha_internal_height', 40 );
if ( ! $height ) {
$height = 40;
}
$bgColor = $this->params->get( 'captcha_internal_bg_color', '255,255,255' );
if ( ! $bgColor ) {
$bgColor = '255,255,255';
}
$bgColors = explode( ',', $bgColor );
$imgBgColors = array();
if ( $bgColors ) for( $i = 0; $i < 3; $i++ ) {
if ( isset( $bgColors[$i] ) ) {
$color = (int) trim( $bgColors[$i] );
$imgBgColors[] = ( $color > 255 ? 255 : ( $color < 0 ? 0 : $color ) );
}
}
if ( ! $imgBgColors ) {
$imgBgColors = array( 255, 255, 255 );
} elseif ( count( $imgBgColors ) < 3 ) {
if ( count( $imgBgColors ) < 2 ) {
$imgBgColors[] = 255;
$imgBgColors[] = 255;
} else {
$imgBgColors[] = 255;
}
}
$txtColor = $this->params->get( 'captcha_internal_txt_color', '20,40,100' );
if ( ! $txtColor ) {
$txtColor = '20,40,100';
}
$txtColors = explode( ',', $txtColor );
$imgTxtColors = array();
if ( $txtColors ) for( $i = 0; $i < 3; $i++ ) {
if ( isset( $txtColors[$i] ) ) {
$color = (int) trim( $txtColors[$i] );
$imgTxtColors[] = ( $color > 255 ? 255 : ( $color < 0 ? 0 : $color ) );
}
}
if ( ! $imgTxtColors ) {
$imgTxtColors = array( 20, 40, 100 );
} elseif ( count( $imgTxtColors ) < 3 ) {
if ( count( $imgTxtColors ) < 2 ) {
$imgTxtColors[] = 40;
$imgTxtColors[] = 100;
} else {
$imgTxtColors[] = 100;
}
}
$nBgColor = $this->params->get( 'captcha_internal_bg_noise_color', '100,120,180' );
if ( ! $nBgColor ) {
$nBgColor = '100,120,180';
}
$nBgColors = explode( ',', $nBgColor );
$imgNoiseBgColors = array();
if ( $nBgColors ) for( $i = 0; $i < 3; $i++ ) {
if ( isset( $nBgColors[$i] ) ) {
$color = (int) trim( $nBgColors[$i] );
$imgNoiseBgColors[] = ( $color > 255 ? 255 : ( $color < 0 ? 0 : $color ) );
}
}
if ( ! $imgNoiseBgColors ) {
$imgNoiseBgColors = array( 100, 120, 180 );
} elseif ( count( $imgNoiseBgColors ) < 3 ) {
if ( count( $imgNoiseBgColors ) < 2 ) {
$imgNoiseBgColors[] = 120;
$imgNoiseBgColors[] = 180;
} else {
$imgNoiseBgColors[] = 180;
}
}
$nFgColor = $this->params->get( 'captcha_internal_fg_noise_color', '100,120,120' );
if ( ! $nFgColor ) {
$nFgColor = '100,120,120';
}
$nFgColors = explode( ',', $nFgColor );
$imgNoiseFgColors = array();
if ( $nFgColors ) for( $i = 0; $i < 3; $i++ ) {
if ( isset( $nFgColors[$i] ) ) {
$color = (int) trim( $nFgColors[$i] );
$imgNoiseFgColors[] = ( $color > 255 ? 255 : ( $color < 0 ? 0 : $color ) );
}
}
if ( ! $imgNoiseFgColors ) {
$imgNoiseFgColors = array( 100, 120, 120 );
} elseif ( count( $imgNoiseFgColors ) < 3 ) {
if ( count( $imgNoiseFgColors ) < 2 ) {
$imgNoiseFgColors[] = 120;
$imgNoiseFgColors[] = 120;
} else {
$imgNoiseFgColors[] = 120;
}
}
$font = $this->params->get( 'captcha_internal_font', 'monofont.ttf' );
if ( ! $font ) {
$font = 'monofont.ttf';
}
if ( ! file_exists( $absPath . '/fonts/' . $font ) ) {
$imgFont = $absPath . '/fonts/monofont.ttf';
} else {
$imgFont = $absPath . '/fonts/' . $font;
}
if ( ! file_exists( $imgFont ) ) {
exit( CBTxt::T( 'failed to locate "[file]" font file', array( '[file]' => $imgFont ) ) );
}
$fontSize = ( $height * 0.75 );
$textBox = imagettfbbox( $fontSize, 0, $imgFont, $code );
if ( $textBox === false ) {
exit( CBTxt::T( 'imagettfbbox failed to establish image size' ) );
}
$width = ( $textBox[4] + 20 );
$image = imagecreate( $width, $height );
if ( $image === false ) {
exit( CBTxt::T( 'imagecreate failed to create new image' ) );
}
$charRotation = (int) $this->params->get( 'captcha_internal_rotation', 13 );
if ( $charRotation < 0 ) {
$charRotation = 0;
}
$charOffset = (int) $this->params->get( 'captcha_internal_offset', 3 );
if ( $charOffset < 0 ) {
$charOffset = 0;
}
$colorRange = (int) $this->params->get( 'captcha_internal_color_range', 2 );
if ( $colorRange < 0 ) {
$colorRange = 0;
}
if ( $colorRange ) {
$bgColorR = mt_rand( ( ( $imgBgColors[0] - $colorRange ) < 0 ? 0 : ( $imgBgColors[0] - $colorRange ) ), ( ( $imgBgColors[0] + $colorRange ) > 255 ? 255 : ( $imgBgColors[0] + $colorRange ) ) );
$bgColorG = mt_rand( ( ( $imgBgColors[1] - $colorRange ) < 0 ? 0 : ( $imgBgColors[1] - $colorRange ) ), ( ( $imgBgColors[1] + $colorRange ) > 255 ? 255 : ( $imgBgColors[1] + $colorRange ) ) );
$bgColorB = mt_rand( ( ( $imgBgColors[2] - $colorRange ) < 0 ? 0 : ( $imgBgColors[2] - $colorRange ) ), ( ( $imgBgColors[2] + $colorRange ) > 255 ? 255 : ( $imgBgColors[2] + $colorRange ) ) );
if ( imagecolorallocate( $image, $bgColorR, $bgColorG, $bgColorB ) === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_BG_COLOR_FAILED', 'imagecolorallocate failed to set BG colors [r], [g], [b]', array( '[r]' => $bgColorR, '[g]' => $bgColorG, '[b]' => $bgColorB ) ) );
}
$textColorR = mt_rand( ( ( $imgTxtColors[0] - $colorRange ) < 0 ? 0 : ( $imgTxtColors[0] - $colorRange ) ), ( ( $imgTxtColors[0] + $colorRange ) > 255 ? 255 : ( $imgTxtColors[0] + $colorRange ) ) );
$textColorG = mt_rand( ( ( $imgTxtColors[1] - $colorRange ) < 0 ? 0 : ( $imgTxtColors[1] - $colorRange ) ), ( ( $imgTxtColors[1] + $colorRange ) > 255 ? 255 : ( $imgTxtColors[1] + $colorRange ) ) );
$textColorB = mt_rand( ( ( $imgTxtColors[2] - $colorRange ) < 0 ? 0 : ( $imgTxtColors[2] - $colorRange ) ), ( ( $imgTxtColors[2] + $colorRange ) > 255 ? 255 : ( $imgTxtColors[2] + $colorRange ) ) );
$textColor = imagecolorallocate( $image, $textColorR, $textColorG, $textColorB );
if ( $textColor === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_TEXT_COLOR_FAILED', 'imagecolorallocate failed to set text colors [r], [g], [b]', array( '[r]' => $textColorR, '[g]' => $textColorG, '[b]' => $textColorB ) ) );
}
$noiseBgColorR = mt_rand( ( ( $imgNoiseBgColors[0] - $colorRange ) < 0 ? 0 : ( $imgNoiseBgColors[0] - $colorRange ) ), ( ( $imgNoiseBgColors[0] + $colorRange ) > 255 ? 255 : ( $imgNoiseBgColors[0] + $colorRange ) ) );
$noiseBgColorG = mt_rand( ( ( $imgNoiseBgColors[1] - $colorRange ) < 0 ? 0 : ( $imgNoiseBgColors[1] - $colorRange ) ), ( ( $imgNoiseBgColors[1] + $colorRange ) > 255 ? 255 : ( $imgNoiseBgColors[1] + $colorRange ) ) );
$noiseBgColorB = mt_rand( ( ( $imgNoiseBgColors[2] - $colorRange ) < 0 ? 0 : ( $imgNoiseBgColors[2] - $colorRange ) ), ( ( $imgNoiseBgColors[2] + $colorRange ) > 255 ? 255 : ( $imgNoiseBgColors[2] + $colorRange ) ) );
$noiseBgColor = imagecolorallocate( $image, $noiseBgColorR, $noiseBgColorG, $noiseBgColorB );
if ( $noiseBgColor === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_BG_NOISE_COLOR_FAILED', 'imagecolorallocate failed to set noise BG colors [r], [g], [b]', array( '[r]' => $noiseBgColorR, '[g]' => $noiseBgColorG, '[b]' => $noiseBgColorB ) ) );
}
$noiseFgColorR = mt_rand( ( ( $imgNoiseFgColors[0] - $colorRange ) < 0 ? 0 : ( $imgNoiseFgColors[0] - $colorRange ) ), ( ( $imgNoiseFgColors[0] + $colorRange ) > 255 ? 255 : ( $imgNoiseFgColors[0] + $colorRange ) ) );
$noiseFgColorG = mt_rand( ( ( $imgNoiseFgColors[1] - $colorRange ) < 0 ? 0 : ( $imgNoiseFgColors[1] - $colorRange ) ), ( ( $imgNoiseFgColors[1] + $colorRange ) > 255 ? 255 : ( $imgNoiseFgColors[1] + $colorRange ) ) );
$noiseFgColorB = mt_rand( ( ( $imgNoiseFgColors[2] - $colorRange ) < 0 ? 0 : ( $imgNoiseFgColors[2] - $colorRange ) ), ( ( $imgNoiseFgColors[2] + $colorRange ) > 255 ? 255 : ( $imgNoiseFgColors[2] + $colorRange ) ) );
$noiseFgColor = imagecolorallocate( $image, $noiseFgColorR, $noiseFgColorG, $noiseFgColorB );
if ( $noiseFgColor === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_FG_NOISE_COLOR_FAILED', 'imagecolorallocate failed to set noise FG colors [r], [g], [b]', array( '[r]' => $noiseFgColorR, '[g]' => $noiseFgColorG, '[b]' => $noiseFgColorB ) ) );
}
} else {
if ( imagecolorallocate( $image, $imgBgColors[0], $imgBgColors[1], $imgBgColors[2] ) === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_BG_COLOR_FAILED', 'imagecolorallocate failed to set BG colors [r], [g], [b]', array( '[r]' => $imgBgColors[0], '[g]' => $imgBgColors[1], '[b]' => $imgBgColors[2] ) ) );
}
$textColor = imagecolorallocate( $image, $imgTxtColors[0], $imgTxtColors[1], $imgTxtColors[2] );
if ( $textColor === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_TEXT_COLOR_FAILED', 'imagecolorallocate failed to set text colors [r], [g], [b]', array( '[r]' => $imgTxtColors[0], '[g]' => $imgTxtColors[1], '[b]' => $imgTxtColors[2] ) ) );
}
$noiseBgColor = imagecolorallocate( $image, $imgNoiseBgColors[0], $imgNoiseBgColors[1], $imgNoiseBgColors[2] );
if ( $noiseBgColor === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_BG_NOISE_COLOR_FAILED', 'imagecolorallocate failed to set noise BG colors [r], [g], [b]', array( '[r]' => $imgNoiseBgColors[0], '[g]' => $imgNoiseBgColors[1], '[b]' => $imgNoiseBgColors[2] ) ) );
}
$noiseFgColor = imagecolorallocate( $image, $imgNoiseFgColors[0], $imgNoiseFgColors[1], $imgNoiseFgColors[2] );
if ( $noiseFgColor === false ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_FG_NOISE_COLOR_FAILED', 'imagecolorallocate failed to set noise FG colors [r], [g], [b]', array( '[r]' => $imgNoiseFgColors[0], '[g]' => $imgNoiseFgColors[1], '[b]' => $imgNoiseFgColors[2] ) ) );
}
}
if ( $this->params->get( 'captcha_internal_bg_noise', 1 ) ) {
for ( $i = 0; $i < ( ( $width * $height ) / 3 ); $i++ ) {
if ( imagefilledellipse( $image, mt_rand( 0, $width ), mt_rand( 0, $height ), 1, 1, $noiseBgColor ) === false ) {
exit( CBTxt::T( 'imagefilledellipse failed to add BG noise to the image' ) );
}
}
for( $i = 1; ( $i < ( $width / 10 ) ); $i++ ) {
if ( imageline( $image, ( ( $i * 10 ) - mt_rand( -20, 20 ) ), 0, ( ( $i * 10 ) + mt_rand( -20, 20 ) ), $height, $noiseBgColor ) === false ) {
exit( CBTxt::T( 'imageline failed to add first pass BG noise to the image' ) );
}
}
for( $i = 1; ( $i < ( $height / 10 ) ); $i++ ) {
if ( imageline( $image, 0, ( ( $i * 10 ) - mt_rand( -20, 20 ) ), $width, ( ( $i * 10 ) + mt_rand( -20, 20 ) ), $noiseBgColor ) === false ) {
exit( CBTxt::T( 'imageline failed to add second pass BG noise to the image' ) );
}
}
}
$x = ( ( $width - $textBox[4] ) / 2 );
$y = ( ( $height - $textBox[5] ) / 2 );
$codeSplit = cbantispamClass::UTF8_str_split( $code );
$i = 0;
if ( $codeSplit ) foreach ( $codeSplit as $c ) {
$result = imagettftext( $image, $fontSize, mt_rand( -$charRotation, $charRotation ), ( $x + $i ), ( $y + mt_rand( -$charOffset, $charOffset ) ), $textColor, $imgFont, $c );
if ( ! $result ) {
exit( CBTxt::T( 'CAPTCHA_IMAGE_TEXT_FAILED', 'imagettftext failed to add "[text]" to the image', array( '[text]' => $c ) ) );
}
$i += ( $textBox[4] / count( $codeSplit ) );
}
if ( $this->params->get( 'captcha_internal_fg_noise', 1 ) ) for ( $i = 0; $i < 3; $i++ ) {
if ( imageline( $image, mt_rand( 0, $width ), mt_rand( 0, $height ), mt_rand( 0, $width ), mt_rand( 0, $height ), $noiseFgColor ) === false ) {
exit( CBTxt::T( 'imageline failed to add FG noise to the image' ) );
}
}
header( 'Expires: Mon, 26 Jul 1997 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' );
switch ( $this->params->get( 'captcha_internal_format', 'jpeg' ) ) {
case 'gif':
header( 'Content-Type: image/gif; charset=utf-8' );
if ( imagegif( $image ) === false ) {
exit( CBTxt::T( 'imagegif failed to generate image' ) );
}
break;
case 'png':
header( 'Content-Type: image/png; charset=utf-8' );
if ( imagepng( $image, null, 0 ) === false ) {
exit( CBTxt::T( 'imagepng failed to generate image' ) );
}
break;
case 'jpeg':
default:
header( 'Content-Type: image/jpeg; charset=utf-8' );
if ( imagejpeg( $image, null, 100 ) === false ) {
exit( CBTxt::T( 'imagejpeg failed to generate image' ) );
}
break;
}
if ( imagedestroy( $image ) === false ) {
exit( CBTxt::T( 'imagedestroy failed to destroy the image' ) );
}
exit();
}
}
