seccode.class.php

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<?php

/*
	[Discuz!] (C)2001-2007 Comsenz Inc.
	This is NOT a freeware, use is subject to license terms

	$Id: seccode.php 10799 2007-10-10 10:35:01Z monkey $
*/

class seccode {

	var $code;			//100000-999999 范围内随机
	var $type 	= 0;		//0 英文图片验证码  1 中文图片验证码  2 Flash 验证码  3 语音验证码
	var $width 	= 0;		//宽度
	var $height 	= 0;		//高度
	var $background	= 1;		//随机图片背景
	var $adulterate	= 1;		//随机背景图形
	var $ttf 	= 0;		//随机 TTF 字体
	var $angle 	= 0;		//随机倾斜度
	var $color 	= 1;		//随机颜色
	var $size 	= 0;		//随机大小
	var $shadow 	= 1;		//文字阴影
	var $animator 	= 0;		//GIF 动画
	var $fontpath	= '';		//TTF 字库目录
	var $datapath	= '';		//图片、声音、Flash 等数据目录
	var $includepath= '';		//其它包含文件目录

	var $fontcolor;
	var $im;


	function seccodeconvert(&$seccode) {
		$s = sprintf('%04s', base_convert($seccode, 10, 20));
		$seccodeunits = 'CEFHKLMNOPQRSTUVWXYZ';
		$seccode = '';
		for($i = 0; $i < 4; $i++) {
			$unit = ord($s{$i});
			$seccode .= ($unit >= 0x30 && $unit <= 0x39) ? $seccodeunits[$unit - 0x30] : $seccodeunits[$unit - 0x57];
		}
	}

	function display() {
		$this->type == 2 && !extension_loaded('ming') && $this->type = 0;
		$this->width = $this->width >= 0 && $this->width <= 200 ? $this->width : 150;
		$this->height = $this->height >= 0 && $this->height <= 80 ? $this->height : 60;
		$this->seccodeconvert($this->code);
		if($this->type < 2 && function_exists('imagecreate') && function_exists('imagecolorset') && function_exists('imagecopyresized') &&
			function_exists('imagecolorallocate') && function_exists('imagechar') && function_exists('imagecolorsforindex') &&
			function_exists('imageline') && function_exists('imagecreatefromstring') && (function_exists('imagegif') || function_exists('imagepng') || function_exists('imagejpeg'))) {
			$this->image();
		} elseif($this->type == 2 && extension_loaded('ming')) {
			$this->flash();
		} elseif($this->type == 3) {
			$this->audio();
		} else {
			$this->bitmap();
		}
	}

	function fileext($filename) {
		return trim(substr(strrchr($filename, '.'), 1, 10));
	}

	function image() {
		$bgcontent = $this->background();

		if($this->animator == 1 && function_exists('imagegif')) {
			include_once $this->includepath.'gifmerge.class.php';
			$trueframe = mt_rand(1, 9);

			for($i = 0; $i <= 9; $i++) {
				$this->im = imagecreatefromstring($bgcontent);
				$x[$i] = $y[$i] = 0;
				$this->adulterate && $this->adulterate();
				if($i == $trueframe) {
					$this->ttf && function_exists('imagettftext') || $this->type == 1 ? $this->ttffont() : $this->giffont();
					$d[$i] = mt_rand(250, 400);
				} else {
					$this->adulteratefont();
					$d[$i] = mt_rand(5, 15);
				}
				ob_start();
				imagegif($this->im);
				imagedestroy($this->im);
				$frame[$i] = ob_get_contents();
				ob_end_clean();
			}
			$anim = new GifMerge($frame, 255, 255, 255, 0, $d, $x, $y, 'C_MEMORY');
			header('Content-type: image/gif');
			echo $anim->getAnimation();
		} else {
			$this->im = imagecreatefromstring($bgcontent);
			$this->adulterate && $this->adulterate();
			$this->ttf && function_exists('imagettftext') || $this->type == 1 ? $this->ttffont() : $this->giffont();

			if(function_exists('imagepng')) {
				header('Content-type: image/png');
				imagepng($this->im);
			} else {
				header('Content-type: image/jpeg');
				imagejpeg($this->im, '', 100);
			}
			imagedestroy($this->im);
		}
	}

	function background() {
		$this->im = imagecreatetruecolor($this->width, $this->height);
		$backgroundcolor = imagecolorallocate($this->im, 255, 255, 255);
		$backgrounds = $c = array();
		if($this->background && function_exists('imagecreatefromjpeg') && function_exists('imagecolorat') &&	function_exists('imagecopymerge') &&
			function_exists('imagesetpixel') && function_exists('imageSX') && function_exists('imageSY')) {
			if($handle = @opendir($this->datapath.'background/')) {
				while($bgfile = @readdir($handle)) {
					if(preg_match('/\.jpg$/i', $bgfile)) {
						$backgrounds[] = $this->datapath.'background/'.$bgfile;
					}
				}
				@closedir($handle);
			}
			if($backgrounds) {
				$imwm = imagecreatefromjpeg($backgrounds[array_rand($backgrounds)]);
				$colorindex = imagecolorat($imwm, 0, 0);
				$this->c = imagecolorsforindex($imwm, $colorindex);
				$colorindex = imagecolorat($imwm, 1, 0);
				imagesetpixel($imwm, 0, 0, $colorindex);
				$c[0] = $c['red'];$c[1] = $c['green'];$c[2] = $c['blue'];
				imagecopymerge($this->im, $imwm, 0, 0, mt_rand(0, 200 - $this->width), mt_rand(0, 80 - $this->height), imageSX($imwm), imageSY($imwm), 100);
				imagedestroy($imwm);
			}
		}
		if(!$this->background || !$backgrounds) {
			for($i = 0;$i < 3;$i++) {
				$start[$i] = mt_rand(200, 255);$end[$i] = mt_rand(100, 150);$step[$i] = ($end[$i] - $start[$i]) / $this->width;$c[$i] = $start[$i];
			}
			for($i = 0;$i < $this->width;$i++) {
				$color = imagecolorallocate($this->im, $c[0], $c[1], $c[2]);
				imageline($this->im, $i, 0, $i-$angle, $this->height, $color);
				$c[0] += $step[0];$c[1] += $step[1];$c[2] += $step[2];
			}
			$c[0] -= 20;$c[1] -= 20;$c[2] -= 20;
		}
		ob_start();
		if(function_exists('imagepng')) {
			imagepng($this->im);
		} else {
			imagejpeg($this->im, '', 100);
		}
		imagedestroy($this->im);
		$bgcontent = ob_get_contents();
		ob_end_clean();
		$this->fontcolor = $c;
		return $bgcontent;
	}

	function adulterate() {
		$linenums = $this->height / 10;
		for($i=0; $i <= $linenums; $i++) {
			$color = $this->color ? imagecolorallocate($this->im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255)) : imagecolorallocate($this->im, $this->fontcolor[0], $this->fontcolor[1], $this->fontcolor[2]);
			$x = mt_rand(0, $this->width);
			$y = mt_rand(0, $this->height);
			if(mt_rand(0, 1)) {
				imagearc($this->im, $x, $y, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, 360), mt_rand(0, 360), $color);
			} else {
				imageline($this->im, $x, $y, $linex + mt_rand(0, $linemaxlong), $liney + mt_rand(0, mt_rand($this->height, $this->width)), $color);
			}
		}
	}

	function adulteratefont() {
		$seccodeunits = 'BCEFGHJKMPQRTVWXY2346789';
		$x = $this->width / 4;
		$y = $this->height / 10;
		$text_color = imagecolorallocate($this->im, $this->fontcolor[0], $this->fontcolor[1], $this->fontcolor[2]);
		for($i = 0; $i <= 3; $i++) {
			$adulteratecode = $seccodeunits[mt_rand(0, 23)];
			imagechar($this->im, 5, $x * $i + mt_rand(0, $x - 10), mt_rand($y, $this->height - 10 - $y), $adulteratecode, $text_color);
		}
	}

	function ttffont() {
		$seccode = $this->code;
		$charset = $GLOBALS['charset'];
		$seccoderoot = $this->type ? $this->fontpath.'ch/' : $this->fontpath.'en/';
		$dirs = opendir($seccoderoot);
		$seccodettf = array();
		while($entry = readdir($dirs)) {
			if($entry != '.' && $entry != '..' && in_array(strtolower($this->fileext($entry)), array('ttf', 'ttc'))) {
				$seccodettf[] = $entry;
			}
		}
		if(empty($seccodettf)) {
			$this->giffont();
			return;
		}
		$seccodelength = 4;
		if($this->type && !empty($seccodettf)) {
			if(strtoupper($charset) != 'UTF-8') {
				include $this->includepath.'chinese.class.php';
				$cvt = new Chinese($charset, 'utf8');
				$seccode = $cvt->Convert($seccode);
			}
			$seccode = array(substr($seccode, 0, 3), substr($seccode, 3, 3));
			$seccodelength = 2;
		}
		$widthtotal = 0;
		for($i = 0; $i < $seccodelength; $i++) {
			$font[$i]['font'] = $seccoderoot.$seccodettf[array_rand($seccodettf)];
			$font[$i]['angle'] = $this->angle ? mt_rand(-30, 30) : 0;
			$font[$i]['size'] = $this->type ? $this->width / 7 : $this->width / 6;
			$this->size && $font[$i]['size'] = mt_rand($font[$i]['size'] - $this->width / 40, $font[$i]['size'] + $this->width / 20);
			$box = imagettfbbox($font[$i]['size'], 0, $font[$i]['font'], $seccode[$i]);
			$font[$i]['zheight'] = max($box[1], $box[3]) - min($box[5], $box[7]);
			$box = imagettfbbox($font[$i]['size'], $font[$i]['angle'], $font[$i]['font'], $seccode[$i]);
			$font[$i]['height'] = max($box[1], $box[3]) - min($box[5], $box[7]);
			$font[$i]['hd'] = $font[$i]['height'] - $font[$i]['zheight'];
			$font[$i]['width'] = (max($box[2], $box[4]) - min($box[0], $box[6])) + mt_rand(0, $this->width / 8);
			$font[$i]['width'] = $font[$i]['width'] > $this->width / $seccodelength ? $this->width / $seccodelength : $font[$i]['width'];
			$widthtotal += $font[$i]['width'];
		}
		$x = mt_rand($font[0]['angle'] > 0 ? cos(deg2rad(90 - $font[0]['angle'])) * $font[0]['zheight'] : 1, $this->width - $widthtotal);
		!$this->color && $text_color = imagecolorallocate($this->im, $this->fontcolor[0], $this->fontcolor[1], $this->fontcolor[2]);
		for($i = 0; $i < $seccodelength; $i++) {
			if($this->color) {
				$this->fontcolor = array(mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
				$this->shadow && $text_shadowcolor = imagecolorallocate($this->im, 255 - $this->fontcolor[0], 255 - $this->fontcolor[1], 255 - $this->fontcolor[2]);
				$text_color = imagecolorallocate($this->im, $this->fontcolor[0], $this->fontcolor[1], $this->fontcolor[2]);
			} elseif($this->shadow) {
				$text_shadowcolor = imagecolorallocate($this->im, 255 - $this->fontcolor[0], 255 - $this->fontcolor[1], 255 - $this->fontcolor[2]);