<?php

/**
 * 验证图片
 *
 * @version        $Id: vdimgck.php 1 15:21 2010年7月5日 tianya $
 * @package        DedeCMS.Libraries
 * @copyright      Copyright (c) 2007 - 2020, DesDev, Inc.
 * @license        http://help.dedecms.com/usersguide/license.html
 * @link           http://www.dedecms.com
 */
require_once(dirname(__FILE__) . '/../include/common.inc.php');
require_once(DEDEDATA . '/safe/inc_safe_config.php');
require_once(DEDEDATA . '/config.cache.inc.php');
$config = array(
    'font_size'   => 20,
    'img_height'  => $safe_wheight,
    'word_type'  => (int)$safe_codetype,   // 1:数字 2:英文  3:单词
    'img_width'   => $safe_wwidth,
    'use_boder'   => TRUE,
    'font_file'   => DEDEINC . '/data/fonts/' . mt_rand(1, 6) . '.ttf',
    'wordlist_file'   => DEDEINC . '/data/words/words.txt',
    'filter_type' => 5
);

$enkey = substr(md5(substr($cfg_cookie_encode, 0, 5)), 0, 10);
$sessSavePath = DEDEDATA . "/sessions_{$enkey}";
if (!is_dir($sessSavePath)) mkdir($sessSavePath);

// Session保存路径

if (is_writeable($sessSavePath) && is_readable($sessSavePath)) {
    session_save_path($sessSavePath);
}
if (!empty($cfg_domain_cookie)) session_set_cookie_params(0, '/', $cfg_domain_cookie);

if (!echo_validate_image($config)) {
    // 如果不成功则初始化一个默认验证码
    @session_start();
    $_SESSION['securimage_code_value'] = strtolower('abcd');
    if (function_exists('imagecreatefromjpeg')) {
        $im = @imagecreatefromjpeg(DEDEINC . '/data/vdcode.jpg');
        header("Pragma:no-cache\r\n");
        header("Cache-Control:no-cache\r\n");
        header("Expires:0\r\n");
        imagejpeg($im);
        imagedestroy($im);
    } else {
        header("Pragma:no-cache\r\n");
        header("Cache-Control:no-cache\r\n");
        header("Expires:0\r\n");
        $c = file_get_contents(DEDEINC . '/data/vdcode.jpg', true);
        $size = filesize(DEDEINC . '/data/vdcode.jpg');
        header('Content-Type: image/x-icon');
        header("Content-length: $size");
        echo $c;
    }
}

function echo_validate_image($config = array())
{
    @session_start();

    if (!function_exists('imagettftext')) {
        return false;
    }

    //主要参数
    $font_size   = isset($config['font_size']) ? $config['font_size'] : 14;
    $img_height  = isset($config['img_height']) ? $config['img_height'] : 38;
    $img_width   = isset($config['img_width']) ? $config['img_width'] : 68;
    $font_file   = isset($config['font_file']) ? $config['font_file'] : DEDEINC . '/data/font/' . mt_rand(1, 6) . '.ttf';
    $use_boder   = isset($config['use_boder']) ? $config['use_boder'] : TRUE;
    $filter_type = isset($config['filter_type']) ? $config['filter_type'] : 0;

    //创建图片，并设置背景色
    $im = @imagecreate($img_width, $img_height);

    imagecolorallocate($im, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));

    //文字随机颜色
    $fontColor[]  = imagecolorallocate($im, 0x15, 0x15, 0x15);
    $fontColor[]  = imagecolorallocate($im, 0x95, 0x1e, 0x04);
    $fontColor[]  = imagecolorallocate($im, 0x93, 0x14, 0xa9);
    $fontColor[]  = imagecolorallocate($im, 0x12, 0x81, 0x0a);
    $fontColor[]  = imagecolorallocate($im, 0x06, 0x3a, 0xd5);

    //获取随机字符
    $rndstring  = '';
    if ($config['word_type'] != 3) {
        for ($i = 0; $i < 4; $i++) {
            if ($config['word_type'] == 1) {
                $c = chr(mt_rand(48, 57));
            } else if ($config['word_type'] == 2) {
                $c = chr(mt_rand(65, 90));
                if ($c == 'I') $c = 'P';
                if ($c == 'O') $c = 'N';
            }
            $rndstring .= $c;
        }
    } else {
        $chars = 'abcdefghigklmnopqrstuvwxwyABCDEFGHIGKLMNOPQRSTUVWXWY0123456789';
        $rndstring = '';
        $length = rand(4, 4);
        $max = strlen($chars) - 1;
        for ($i = 0; $i < $length; $i++) {
            $rndstring .= $chars[mt_rand(0, $max)];
        }
    }

    $_SESSION['securimage_code_value'] = strtolower($rndstring);

    $rndcodelen = strlen($rndstring);

    // //背景横线
    // $lineColor1 = imagecolorallocate($im, 0xda, 0xd9, 0xd1);
    // for ($j = 3; $j <= $img_height - 3; $j = $j + 3) {
    //     imageline($im, 2, $j, $img_width - 2, $j, $lineColor1);
    // }

    // //背景竖线
    // $lineColor2 = imagecolorallocate($im, 0xda, 0xd9, 0xd1);
    // for ($j = 2; $j < 100; $j = $j + 6) {
    //     imageline($im, $j, 0, $j + 8, $img_height, $lineColor2);
    // }

    // 增加一些噪线
    for ($i=0; $i < 5; $i++) { 
        $red = mt_rand(50, 255);
        $green = mt_rand(50, 255);
        $blue = mt_rand(50, 255);
        $tcol = imagecolorallocate($im, $red, $green, $blue);
        if (mt_rand(0, 1)) { // Horizontal
            $Xa   = mt_rand(0, $img_width/2);
            $Ya   = mt_rand(0, $img_height);
            $Xb   = mt_rand($img_width/2, $img_width);
            $Yb   = mt_rand(0, $img_height);
        } else { // Vertical
            $Xa   = mt_rand(0, $img_width);
            $Ya   = mt_rand(0, $img_height/2);
            $Xb   = mt_rand(0, $img_width);
            $Yb   = mt_rand($img_height/2, $img_height);
        }
        imagesetthickness($im, mt_rand(1, 3));
        imageline($im, $Xa, $Ya, $Xb, $Yb, $tcol);
    }


    //画边框
    if ($use_boder && $filter_type == 0) {
        $bordercolor = imagecolorallocate($im, 0x9d, 0x9e, 0x96);
        imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $bordercolor);
    }

    //输出文字
    $lastc = '';
    for ($i = 0; $i < $rndcodelen; $i++) {
        $rndstring[$i] = strtoupper($rndstring[$i]);
        $c_fontColor = $fontColor[mt_rand(0, 4)];
        $y_pos = $i == 0 ? 4 : $i * ($font_size + 2);
        $c = mt_rand(10, 30);
        @imagettftext($im, $font_size, $c, $y_pos, 28, $c_fontColor, $font_file, $rndstring[$i]);
        $lastc = $rndstring[$i];
    }

    //图象效果
    switch ($filter_type) {
        case 1:
            imagefilter($im, IMG_FILTER_NEGATE);
            break;
        case 2:
            imagefilter($im, IMG_FILTER_EMBOSS);
            break;
        case 3:
            imagefilter($im, IMG_FILTER_EDGEDETECT);
            break;
        default:
            break;
    }

    header("Pragma:no-cache\r\n");
    header("Cache-Control:no-cache\r\n");
    header("Expires:0\r\n");

    //输出特定类型的图片格式，优先级为 gif -> jpg ->png
    //dump(function_exists("imagejpeg"));

    if (function_exists("imagejpeg")) {
        header("content-type:image/jpeg\r\n");
        imagejpeg($im);
    } else {
        header("content-type:image/png\r\n");
        imagepng($im);
    }
    imagedestroy($im);
    exit();
}