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Captcha.php
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Captcha.php
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<?php
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @namespace
*/
namespace net\phpvim;
require_once 'AbstractCaptcha.php';
/**
* Captcha Generator
*
* @package
* @copyright Copyright (C) 2011
* @author Verdana Mu
* @license
*/
class Captcha extends AbstractCaptcha
{
/**
* 随机字符串
*
* @var mixed
* @access private
*/
private $_word;
/* public __construct(array $options) {{{ */
/**
* __construct
*
* @param array $options
* @access public
* @return void
*/
public function __construct($options = array())
{
parent::__construct($options);
// 生成一段随机的字符串,并保存到设置中
// TODO 支持字典模式
$this->_word = $this->random();
// 保存到 Session
session_start();
$_SESSION['Captcha'] = $this->_word;
}
// }}}
/* public getWord() {{{ */
/**
* 返回随机字符串
*
* @access public
* @return void
*/
public function getWord()
{
return $this->_word;
}
// }}}
/* public create() {{{ */
/**
* 生成图片
*
* @access public
* @return void
*/
public function create()
{
$fontPath = __DIR__ . '/' . $this->fontDir . $this->font;
if (!file_exists($fontPath)) {
throw new \Exception('Image Captcha requires font');
}
// create the image
$width = $this->width;
$height = $this->height;
$size = $this->fontSize;
$image = $this->createCanvas($width, $height);
// $textColor = ImageColorAllocate($image, $this->textColor['r'], $this->textColor['g'], $this->textColor['b']);
$hpos = $size; // horizontal pos
$word = $this->getWord();
for ($i = 0; $i < $this->length; $i ++) {
$char = $word[$i];
// convert char to low/upper/random case.
if ($this->charCase == 'upper') {
$char = strtoupper($char);
} elseif ($this->charCase == 'lower') {
$char = strtolower($char);
} elseif ($this->charCase == 'random') {
$func = (rand(1, 10) < 5) ? 'strtolower' : 'strtoupper'; // 50%
$char = $func($char);
}
// text color
$color = $this->textColor($image);
$vpos = mt_rand($size * 1.3, $size * 2.0); // random vertical pos
ImageFtText($image, $size, mt_rand(-25, 50), $hpos, $vpos, $color, $fontPath, $char);
$hpos += mt_rand($size, $size * 1.8);
}
// prevent client side caching
$this->preventCache();
// send image to browser
header('Content-type: image/png');
ImagePNG($image);
ImageDestroy($image);
}
// }}}
/* protected createCanvas($width, $height) {{{ */
/**
* 生成初始的图片模型
*
* @param mixed $width
* @param mixed $height
* @access protected
* @return void
*/
protected function createCanvas($width, $height)
{
// 创建纯色背景的图片
$image = ImageCreateTrueColor($width, $height);
// 是否使用背景图片?
if (!empty($this->background)) {
$background = __DIR__ . '/' . $this->imageDir . $this->background;
if (!file_exists($background)) {
throw new \Exception("Image Captcha can not locate background image");
}
$bgImg = @ImageCreateFromGif($background);
if (!$bgImg) {
throw new \Exception("Can not load background image");
}
$fillType = strtolower($this->bgFillType);
// 平铺背景图
if ($fillType == 'tile') {
ImageSetTile($image, $bgImg);
ImageFilledRectangle($image, 0, 0, 800, 600, IMG_COLOR_TILED);
}
// 拉伸背景图
if ($fillType == 'stretch') {
$w = ImageSx($bgImg);
$h = ImageSy($bgImg);
ImageCopyResampled($image, $bgImg, 0, 0, 0, 0, $width, $height, $w, $h);
}
return $image;
}
$bgColor = ImageColorAllocate($image, $this->bgColor['r'], $this->bgColor['g'], $this->bgColor['b']);
ImageFilledRectangle($image, 0, 0, $width-1, $height-1, $bgColor);
return $image;
}
// }}}
/* protected random() {{{ */
/**
* 生成随即的字符串
* 每个字符之间将被随机插入1-3个空格
*
* @access protected
* @return void
*/
protected function random()
{
if ($this->length <= 0) {
$this->length = 6;
}
$shuffle = $this->chars;
$i = 0;
while ($i < $this->length) {
$shuffle = str_shuffle($shuffle);
$i++;
}
return substr($shuffle, 0, $this->length);
}
// }}}
/* protected textColor($image) {{{ */
/**
* 随机字体颜色
*
* @param mixed $image
* @access protected
* @return void
*/
protected function textColor(&$image)
{
$key = array_rand($this->textColor);
$color = $this->textColor[$key];
return ImageColorAllocate($image, $color['r'], $color['g'], $color['b']);
}
// }}}
/* protected preventCache() {{{ */
/**
* preventCache
*
* @access protected
* @return void
*/
protected function preventCache()
{
if (headers_sent($filename, $linenum)) {
throw new \Exception(sprintf('Headers already sent in %s on line %s', $filename, $linenum));
}
// Send headers
header('Expires: Wed, 1 Jan 1997 00:00:00 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');
}
// }}}
}
/*- vim: set ff=unix shiftwidth=4 tabstop=4 expandtab: -*/