1893 lines
83 KiB
PHP
1893 lines
83 KiB
PHP
<?php
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namespace extend;
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//定义版本信息
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//define('VERSION', '2.8.10');
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//如果有配置文件,则加载timthumb-config.php,没有的话使用下面的值
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if (file_exists(dirname(__FILE__) . '/timthumb-config.php')) {
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require_once('timthumb-config.php');
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}
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//调试日志记录到web服务器日志中
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if (!defined('DEBUG_ON')) {
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define('DEBUG_ON', false);
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}
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//调试级别,高于这个值的level都不会记录,1最低,3最高
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if (!defined('DEBUG_LEVEL')) {
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define('DEBUG_LEVEL', 1);
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}
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//最大占用内存限制30M
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if (!defined('MEMORY_LIMIT')) {
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define('MEMORY_LIMIT', '30M');
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}
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//关闭仿盗链
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if (!defined('BLOCK_EXTERNAL_LEECHERS')) {
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define('BLOCK_EXTERNAL_LEECHERS', false);
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}
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// 允许从外部获取图片
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if (!defined('ALLOW_EXTERNAL')) {
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define('ALLOW_EXTERNAL', TRUE);
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}
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//允许获取所有外部站点url
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if (!defined('ALLOW_ALL_EXTERNAL_SITES')) {
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define('ALLOW_ALL_EXTERNAL_SITES', true);
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}
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//启用文件缓存
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if (!defined('FILE_CACHE_ENABLED')) {
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define('FILE_CACHE_ENABLED', TRUE);
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}
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//文件缓存更新时间,s
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if (!defined('FILE_CACHE_TIME_BETWEEN_CLEANS')) {
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define('FILE_CACHE_TIME_BETWEEN_CLEANS', 86400);
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}
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//文件缓存生存时间,s,过了这个时间的缓存文件就会被删除
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if (!defined('FILE_CACHE_MAX_FILE_AGE')) {
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define('FILE_CACHE_MAX_FILE_AGE', 86400);
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}
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//缓存文件后缀
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if (!defined('FILE_CACHE_SUFFIX')) {
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define('FILE_CACHE_SUFFIX', '.timthumb.txt');
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}
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//缓存文件前缀
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if (!defined('FILE_CACHE_PREFIX')) {
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define('FILE_CACHE_PREFIX', 'timthumb');
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}
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//缓存文件目录,留空则使用系统临时目录(推荐)
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if (!defined('FILE_CACHE_DIRECTORY')) {
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define('FILE_CACHE_DIRECTORY', app()->getRuntimePath(). '/temp');
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}
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//图片最大尺寸,此脚本最大能处理10485760字节的图片,也就是10M
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if (!defined('MAX_FILE_SIZE')) {
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define('MAX_FILE_SIZE', 10485760);
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}
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//CURL的超时时间
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if (!defined('CURL_TIMEOUT')) {
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define('CURL_TIMEOUT', 20);
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}
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//清理错误缓存的时间
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if (!defined('WAIT_BETWEEN_FETCH_ERRORS')) {
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define('WAIT_BETWEEN_FETCH_ERRORS', 3600);
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}
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//浏览器缓存时间
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if (!defined('BROWSER_CACHE_MAX_AGE')) {
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define('BROWSER_CACHE_MAX_AGE', 864000);
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}
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//关闭所有浏览器缓存
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if (!defined('BROWSER_CACHE_DISABLE')) {
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define('BROWSER_CACHE_DISABLE', false);
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}
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//最大图像宽度
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if (!defined('MAX_WIDTH')) {
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define('MAX_WIDTH', 1500);
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}
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//最大图像高度
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if (!defined('MAX_HEIGHT')) {
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define('MAX_HEIGHT', 1500);
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}
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//404错误时显示的提示图片地址,设置测值则不会显示具体的错误信息
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if (!defined('NOT_FOUND_IMAGE')) {
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define('NOT_FOUND_IMAGE', '');
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}
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//其他错误时显示的提示图片地址,设置测值则不会显示具体的错误信息
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if (!defined('ERROR_IMAGE')) {
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define('ERROR_IMAGE', '');
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}
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//PNG图片背景颜色,使用false代表透明
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if (!defined('PNG_IS_TRANSPARENT')) {
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define('PNG_IS_TRANSPARENT', FALSE);
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}
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//默认图片质量
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if (!defined('DEFAULT_Q')) {
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define('DEFAULT_Q', 90);
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}
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//默认 缩放/裁剪 模式,0:根据传入的值进行缩放(不裁剪), 1:以最合适的比例裁剪和调整大小(裁剪), 2:按比例调整大小,并添加边框(裁剪),2:按比例调整大小,不添加边框(裁剪)
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if (!defined('DEFAULT_ZC')) {
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define('DEFAULT_ZC', 1);
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}
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//默认需要对图片进行的处理操作,可选值和参数格式请参看processImageAndWriteToCache函数中的$filters和$imageFilters的注释
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if (!defined('DEFAULT_F')) {
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define('DEFAULT_F', '');
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}
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//是否对图片进行锐化
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if (!defined('DEFAULT_S')) {
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define('DEFAULT_S', 0);
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}
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//默认画布颜色
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if (!defined('DEFAULT_CC')) {
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define('DEFAULT_CC', 'ffffff');
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}
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//以下是图片压缩设置,前提是你的主机中有optipng或者pngcrush这两个工具,否则的话不会启用此功能
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//此功能只对png图片有效
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if (!defined('OPTIPNG_ENABLED')) {
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define('OPTIPNG_ENABLED', false);
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}
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if (!defined('OPTIPNG_PATH')) {
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define('OPTIPNG_PATH', '/usr/bin/optipng');
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} //优先使用optipng,因为有更好的压缩比
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if (!defined('PNGCRUSH_ENABLED')) {
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define('PNGCRUSH_ENABLED', false);
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}
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if (!defined('PNGCRUSH_PATH')) {
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define('PNGCRUSH_PATH', '/usr/bin/pngcrush');
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} //optipng不存在的话,使用pngcrush
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//图片压缩设置结束
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/*
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* * 以下是网站截图配置
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* 首先,网站截图需要root权限
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* Ubuntu 上使用网站截图的步骤:
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* 1.用这个命令安装Xvfb sudo apt-get install subversion libqt4-webkit libqt4-dev g++ xvfb
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* 2.新建一个文件夹,并下载下面的源码
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* 3.用这个命令下载最新的CutyCapt svn co https://cutycapt.svn.sourceforge.net/svnroot/cutycapt
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* 4.进入CutyCapt文件夹
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* 5.编译并安装CutyCapt
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* 6.尝试运行以下命令: xvfb-run --server-args="-screen 0, 1024x768x24" CutyCapt --url="http://markmaunder.com/" --out=test.png
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* 7.如果生成了一个 test.php的图片,证明一切正常,现在通过浏览器试试,访问下面的地址:http://yoursite.com/path/to/<a timthumb.php?src=http://markmaunder.com/&webshot=1
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*
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* 需要注意的地方:
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* 1.第一次webshot加载时,需要数秒钟,之后加载就很快了
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*
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* 高级用户:
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* 1.如果想提速大约25%,并且你了解linux,可以运行以下命令:
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* nohup Xvfb :100 -ac -nolisten tcp -screen 0, 1024x768x24 > /dev/null 2>&1 &
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* 并设置 WEBSHOT_XVFB_RUNNING 的值为true
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*
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* */
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//测试的功能,如果设置此值为true, 并在查询字符串中加上webshot=1,会让脚本返回浏览器的截图,而不是获取图像
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if (!defined('WEBSHOT_ENABLED')) {
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define('WEBSHOT_ENABLED', false);
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}
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//定义CutyCapt地址
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if (!defined('WEBSHOT_CUTYCAPT')) {
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define('WEBSHOT_CUTYCAPT', '/usr/local/bin/CutyCapt');
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}
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//Xvfb地址
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if (!defined('WEBSHOT_XVFB')) {
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define('WEBSHOT_XVFB', '/usr/bin/xvfb-run');
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}
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//截图屏幕宽度1024
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if (!defined('WEBSHOT_SCREEN_X')) {
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define('WEBSHOT_SCREEN_X', '1024');
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}
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//截图屏幕高度768
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if (!defined('WEBSHOT_SCREEN_Y')) {
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define('WEBSHOT_SCREEN_Y', '768');
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}
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//色深,作者说他只测试过24
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if (!defined('WEBSHOT_COLOR_DEPTH')) {
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define('WEBSHOT_COLOR_DEPTH', '24');
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}
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//截图格式
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if (!defined('WEBSHOT_IMAGE_FORMAT')) {
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define('WEBSHOT_IMAGE_FORMAT', 'png');
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}
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//截图超时时间,单位s
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if (!defined('WEBSHOT_TIMEOUT')) {
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define('WEBSHOT_TIMEOUT', '20');
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}
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//user_agent头
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if (!defined('WEBSHOT_USER_AGENT')) {
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define('WEBSHOT_USER_AGENT', "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.18) Gecko/20110614 Firefox/3.6.18");
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}
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//是否启用JS
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if (!defined('WEBSHOT_JAVASCRIPT_ON')) {
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define('WEBSHOT_JAVASCRIPT_ON', true);
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}
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//是否启用java
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if (!defined('WEBSHOT_JAVA_ON')) {
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define('WEBSHOT_JAVA_ON', false);
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}
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//开启flash和其他插件
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if (!defined('WEBSHOT_PLUGINS_ON')) {
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define('WEBSHOT_PLUGINS_ON', true);
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}
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//代理服务器
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if (!defined('WEBSHOT_PROXY')) {
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define('WEBSHOT_PROXY', '');
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}
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//如果运行了XVFB,此项设为true
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if (!defined('WEBSHOT_XVFB_RUNNING')) {
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define('WEBSHOT_XVFB_RUNNING', false);
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}
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// 如果 ALLOW_EXTERNAL 的值为真 并且 ALLOW_ALL_EXTERNAL_SITES 的值为假,那么截图的图片只能从下面这些数组中的域和子域进行
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if (!isset($ALLOWED_SITES)) {
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$ALLOWED_SITES = array(
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'flickr.com',
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'staticflickr.com',
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'picasa.com',
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'img.youtube.com',
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'upload.wikimedia.org',
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'photobucket.com',
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'imgur.com',
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'imageshack.us',
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'tinypic.com',
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);
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}
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/*截图配置结束*/
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//timthumb::start();
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class Timthumb
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{
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protected $src = ""; //需要获取的图片url
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protected $is404 = false; //404错误码
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protected $docRoot = ""; //服务器文档根目录
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protected $lastURLError = false; //上一次请求外部url的错误信息
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protected $localImage = ""; //如果请求的url是本地图片,则为本地图片的地址
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protected $localImageMTime = 0; //本地图片的修改时间
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protected $url = false; //用parse_url解析src后的数组
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protected $myHost = ""; //本机域名
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protected $isURL = false; //是否为外部图片地址
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protected $cachefile = ''; //缓存文件地址
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protected $errors = array(); //错误信息列表
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protected $toDeletes = array(); //析构函数中需要删除的资源列表
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protected $cacheDirectory = ''; //缓存地址
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protected $startTime = 0; //开始时间
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protected $lastBenchTime = 0; //上一次debug完成的时间
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protected $cropTop = false; //是否启用裁剪
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protected $salt = ""; //文件修改时间和inode连接的字符串的盐值
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protected $fileCacheVersion = 1; //文件缓存版本,当这个类升级或者被更改时,这个值应该改变,从而重新生成缓存
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protected $filePrependSecurityBlock = "<?php die('Execution denied!'); //"; //缓存文件安全头,防止直接访问
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protected static $curlDataWritten = 0; //将curl获取到的数据写入缓存文件的长度
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protected static $curlFH = false; //curl请求成功后要将获取到的数据写到此文件内
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/*外部调用接口*/
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public static function start()
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{
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//实例化模型
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$tim = new Timthumb();
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//检查实例化模型时是否有错误
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$tim->handleErrors();
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//此函数为空,用做自定义的数据验证
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$tim->securityChecks();
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//尝试读取浏览器缓存
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if ($tim->tryBrowserCache()) {
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//成功的话就输出缓存
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exit(0);
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}
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//检测错误
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$tim->handleErrors();
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//如果启用了文件缓存,并且读取服务端缓存
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if (FILE_CACHE_ENABLED && $tim->tryServerCache()) {
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//成功的话输出缓存
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exit(0);
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}
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//检测读取服务端缓存时的错误
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$tim->handleErrors();
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//生成和处理图片主函数
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$tim->run();
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//检测图片生成和处理时的错误
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$tim->handleErrors();
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//程序执行完毕运行析构方法并退出
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exit(0);
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}
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/*构造方法,用来获取和设置一些基本属性*/
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public function __construct()
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{
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//将允许的域设为全局变量
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global $ALLOWED_SITES;
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//记录开始时间
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$this->startTime = microtime(true);
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//设置时区
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date_default_timezone_set('UTC');
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//写日志,记录请求IP和请求URL
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$this->debug(1, "Starting new request from " . $this->getIP() . " to " . $_SERVER['REQUEST_URI']);
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//获取服务器文档根目录
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$this->calcDocRoot();
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//获取文件的修改时间和inode,inode只在linux系统下有效
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$this->salt = @filemtime(__FILE__) . '-' . @fileinode(__FILE__);
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//记录salt信息,级别3
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$this->debug(3, "Salt is: " . $this->salt);
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//如果定义了缓存文件地址
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if (FILE_CACHE_DIRECTORY) {
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//如果这个地址不存在,或为非目录
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if (!is_dir(FILE_CACHE_DIRECTORY)) {
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//建立这个目录
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@mkdir(FILE_CACHE_DIRECTORY);
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//如果建立失败
|
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if (!is_dir(FILE_CACHE_DIRECTORY)) {
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//记录错误信息,停止执行
|
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$this->error("Could not create the file cache directory.");
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return false;
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}
|
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}
|
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//将缓存地址写入成员属性
|
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$this->cacheDirectory = FILE_CACHE_DIRECTORY;
|
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//在缓存目录下创建一个index.html文件,防止列目录
|
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if (!touch($this->cacheDirectory . '/index.html')) {
|
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//如果出错,记录错误信息
|
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$this->error("Could not create the index.html file - to fix this create an empty file named index.html file in the cache directory.");
|
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}
|
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//如果没定义缓存文件地址,则用系统的临时文件目录做为缓存文件目录
|
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} else {
|
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$this->cacheDirectory = sys_get_temp_dir();
|
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}
|
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//进行缓存检查,清除过期缓存
|
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$this->cleanCache();
|
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//记录本机域名
|
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$this->myHost = preg_replace('/^www\./i', '', $_SERVER['HTTP_HOST']);
|
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//获取图片地址,此地址应该由$_GET中的src参数传递
|
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$this->src = $this->param('src');
|
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//此数组是解析src后的结果,包括scheme,host,port,user,pass,path,query,fragment其中一个或多个值
|
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$this->url = parse_url($this->src);
|
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//如果图片地址是本机的,则删除图片url中本机的域名部分
|
||
$this->src = preg_replace('/https?:\/\/(?:www\.)?' . $this->myHost . '/i', '', $this->src);
|
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//如果图片地址的长度小于3,则是无效地址
|
||
if (strlen($this->src) <= 3) {
|
||
//添加错误信息
|
||
$this->error("No image specified");
|
||
return false;
|
||
}
|
||
//如果开启了防盗链,并且存在来源地址,也就是HTTP_REFERER头,并且来源地址不是本机,则进行防盗链处理
|
||
if (BLOCK_EXTERNAL_LEECHERS && array_key_exists('HTTP_REFERER', $_SERVER) && (!preg_match('/^https?:\/\/(?:www\.)?' . $this->myHost . '(?:$|\/)/i', $_SERVER['HTTP_REFERER']))) {
|
||
//此base64编码的内容是一张显示 No Hotlinking的图片
|
||
$imgData = base64_decode("R0lGODlhUAAMAIAAAP8AAP///yH5BAAHAP8ALAAAAABQAAwAAAJpjI+py+0Po5y0OgAMjjv01YUZ\nOGplhWXfNa6JCLnWkXplrcBmW+spbwvaVr/cDyg7IoFC2KbYVC2NQ5MQ4ZNao9Ynzjl9ScNYpneb\nDULB3RP6JuPuaGfuuV4fumf8PuvqFyhYtjdoeFgAADs=");
|
||
//显示内容为gif图片
|
||
header('Content-Type: image/gif');
|
||
//内容长度
|
||
header('Content-Length: ' . sizeof($imgData));
|
||
//无网页缓存
|
||
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
|
||
//兼容http1.0和https
|
||
header("Pragma: no-cache");
|
||
//内容立即过期
|
||
header('Expires: ' . gmdate('D, d M Y H:i:s', time()));
|
||
//输出图片
|
||
echo $imgData;
|
||
return false;
|
||
//退出脚本
|
||
exit(0);
|
||
}
|
||
//如果此时的src属性包含http等字符,说明是外部链接
|
||
if (preg_match('/^https?:\/\/[^\/]+/i', $this->src)) {
|
||
//写日志,说明这个链接是外部的,级别2
|
||
$this->debug(2, "Is a request for an external URL: " . $this->src);
|
||
//将isURL设为true,说明是外部url
|
||
$this->isURL = true;
|
||
//如果不包含的话,说明是内部链接
|
||
} else {
|
||
$this->debug(2, "Is a request for an internal file: " . $this->src);
|
||
}
|
||
//如果图片的src是外部网站,并且配置文件不允许从外部获取图片,则退出
|
||
if ($this->isURL && (!ALLOW_EXTERNAL)) {
|
||
$this->error("You are not allowed to fetch images from an external website.");
|
||
return false;
|
||
}
|
||
//如果允许从外部网站获取图片
|
||
if ($this->isURL) {
|
||
//并且配置文件允许从所有的外部网站获取图片
|
||
if (ALLOW_ALL_EXTERNAL_SITES) {
|
||
//写日志,允许从外部网站取回图片,级别2
|
||
$this->debug(2, "Fetching from all external sites is enabled.");
|
||
//如果配置文件不允许从所有的外部网站获取图片
|
||
} else {
|
||
//写日志,只能从指定的外部网站获取图片,级别2
|
||
$this->debug(2, "Fetching only from selected external sites is enabled.");
|
||
//此为验证位,默认为false
|
||
$allowed = false;
|
||
//遍历配置文件中允许站点的列表
|
||
foreach ($ALLOWED_SITES as $site) {
|
||
//这里对图片的url跟允许访问站点的列表进行验证,前面的条件对应的是有主机名的,后面的内容对应的是没有主机名的,写的很精巧
|
||
if ((strtolower(substr($this->url['host'], -strlen($site) - 1)) === strtolower(".$site")) || (strtolower($this->url['host']) === strtolower($site))) {
|
||
//通过验证则写一条日志,验证成功,级别3
|
||
$this->debug(3, "URL hostname {$this->url['host']} matches $site so allowing.");
|
||
//验证位为true
|
||
$allowed = true;
|
||
}
|
||
}
|
||
//如果没通过验证, 写错误信息并退出
|
||
if (!$allowed) {
|
||
return $this->error("You may not fetch images from that site. To enable this site in timthumb, you can either add it to \$ALLOWED_SITES and set ALLOW_EXTERNAL=true. Or you can set ALLOW_ALL_EXTERNAL_SITES=true, depending on your security needs.");
|
||
}
|
||
}
|
||
}
|
||
//缓存文件的前缀,如果是内部图片,用_int_,外部图片用_ext_
|
||
$cachePrefix = ($this->isURL ? '_ext_' : '_int_');
|
||
//如果是外部图片地址
|
||
if ($this->isURL) {
|
||
//得到GET字符串的数组
|
||
$arr = explode('&', $_SERVER ['QUERY_STRING']);
|
||
//按字母顺序对数组元素排序
|
||
asort($arr);
|
||
//生成缓存文件地址 缓存目录 + / + 缓存前缀 + $cachePrefix + 唯一散列值 + 缓存后缀
|
||
$this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . implode('', $arr) . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
|
||
//如果是本地图片
|
||
} else {
|
||
//获取本地图片地址
|
||
$this->localImage = $this->getLocalImagePath($this->src);
|
||
//如果获取不到地址
|
||
if (!$this->localImage) {
|
||
//写日志,没有找到此文件,级别1
|
||
$this->debug(1, "Could not find the local image: {$this->localImage}");
|
||
//记录错误信息
|
||
$this->error("Could not find the internal image you specified.");
|
||
//设置404错误信息
|
||
$this->set404();
|
||
//终止执行程序
|
||
return false;
|
||
}
|
||
//写日志,记录本地图片信息,级别1
|
||
$this->debug(1, "Local image path is {$this->localImage}");
|
||
//获取文件修改时间
|
||
$this->localImageMTime = @filemtime($this->localImage);
|
||
//生成缓存文件地址, 缓存目录 + / + 缓存前缀 + $cachePrefix + 唯一散列值 + 缓存后缀
|
||
$this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . $this->localImageMTime . $_SERVER ['QUERY_STRING'] . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
|
||
}
|
||
//记录缓存文件地址
|
||
$this->debug(2, "Cache file is: " . $this->cachefile);
|
||
//构造函数完成
|
||
return true;
|
||
}
|
||
|
||
/*析构方法,删除toDeletes数组中的每一个文件*/
|
||
public function __destruct()
|
||
{
|
||
foreach ($this->toDeletes as $del) {
|
||
$this->debug(2, "Deleting temp file $del");
|
||
@unlink($del);
|
||
}
|
||
}
|
||
|
||
/*主函数,通过不同参数调用不同的图片处理函数*/
|
||
public function run()
|
||
{
|
||
//如果是外部的图片链接
|
||
if ($this->isURL) {
|
||
//但是配置文件不允许从外部获取链接
|
||
if (!ALLOW_EXTERNAL) {
|
||
//写日志,说明配置文件禁止访问外部图片,级别1
|
||
$this->debug(1, "Got a request for an external image but ALLOW_EXTERNAL is disabled so returning error msg.");
|
||
//写错误记录
|
||
$this->error("You are not allowed to fetch images from an external website.");
|
||
//退出执行
|
||
return false;
|
||
}
|
||
//配置文件允许从外部获取链接,则写日志,接着运行,级别3
|
||
$this->debug(3, "Got request for external image. Starting serveExternalImage.");
|
||
//如果get了webshot参数并且为真,则进行截图操作
|
||
if ($this->param('webshot')) {
|
||
//如果配置文件允许截图
|
||
if (WEBSHOT_ENABLED) {
|
||
//写日志,说明要进行截图操作,级别3
|
||
$this->debug(3, "webshot param is set, so we're going to take a webshot.");
|
||
//截图操作
|
||
$this->serveWebshot();
|
||
//如果配置文件不允许截图
|
||
} else {
|
||
//记录错误信息并退出
|
||
$this->error("You added the webshot parameter but webshots are disabled on this server. You need to set WEBSHOT_ENABLED == true to enable webshots.");
|
||
}
|
||
//如果不存在sebshot参数或为假
|
||
} else {
|
||
//写日志,记录不进行截图操作,级别3
|
||
$this->debug(3, "webshot is NOT set so we're going to try to fetch a regular image.");
|
||
//从外部URL获得图片并处理
|
||
$this->serveExternalImage();
|
||
}
|
||
//否则的话就是内部图片
|
||
} else {
|
||
//写日志,记录是内部图片,级别3
|
||
$this->debug(3, "Got request for internal image. Starting serveInternalImage()");
|
||
//获得内部图片并处理
|
||
$this->serveInternalImage();
|
||
}
|
||
//程序执行完毕
|
||
return true;
|
||
}
|
||
|
||
/*此函数用来处理错误*/
|
||
protected function handleErrors()
|
||
{
|
||
//如果错误列表中有内容
|
||
if ($this->haveErrors()) {
|
||
//首先检测404错误,如果设置了404图片地址并且的确有404错误
|
||
if (NOT_FOUND_IMAGE && $this->is404()) {
|
||
//那么输出错误图片,并退出脚本
|
||
if ($this->serveImg(NOT_FOUND_IMAGE)) {
|
||
exit(0);
|
||
//输出失败的话记录错误信息
|
||
} else {
|
||
$this->error("Additionally, the 404 image that is configured could not be found or there was an error serving it.");
|
||
}
|
||
}
|
||
//如果没有404错误,并且定义了错误图片,那么输出此图片
|
||
if (ERROR_IMAGE) {
|
||
//输出其他错误提示图片,并退出脚本
|
||
if ($this->serveImg(ERROR_IMAGE)) {
|
||
exit(0);
|
||
//输出失败的话记录错误信息
|
||
} else {
|
||
$this->error("Additionally, the error image that is configured could not be found or there was an error serving it.");
|
||
}
|
||
}
|
||
//如果上面两个常量都没定义,则根据模板输出详细错误信息
|
||
$this->serveErrors();
|
||
exit(0);
|
||
}
|
||
//没有错误的话返回假
|
||
return false;
|
||
}
|
||
|
||
/*此函数用来读取浏览器缓存文件,前提是浏览器缓存的文件有效,具体的实现请看函数内部*/
|
||
protected function tryBrowserCache()
|
||
{
|
||
//如果配置文件关闭了所有浏览器缓存,则写日志,并返回假
|
||
if (BROWSER_CACHE_DISABLE) {
|
||
$this->debug(3, "Browser caching is disabled");
|
||
return false;
|
||
}
|
||
//如果浏览器记录了页面上次修改的时间
|
||
if (!empty($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
|
||
//写日志,记录,级别3
|
||
$this->debug(3, "Got a conditional get");
|
||
//缓存文件最后修改时间
|
||
$mtime = false;
|
||
//如果缓存地址无效
|
||
if (!is_file($this->cachefile)) {
|
||
//说明没有缓存,返回假
|
||
return false;
|
||
}
|
||
//如果存在本地图片修改时间,也就是说所请求的图片是本机的
|
||
if ($this->localImageMTime) {
|
||
//缓存文件修改时间设置为本地图片修改时间
|
||
$mtime = $this->localImageMTime;
|
||
//写日志,记录实际文件修改时间,级别3
|
||
$this->debug(3, "Local real file's modification time is $mtime");
|
||
//如果请求的图片不是本地的
|
||
} else if (is_file($this->cachefile)) {
|
||
//获取缓存文件修改时间
|
||
$mtime = @filemtime($this->cachefile);
|
||
//写日志,记录缓存文件修改时间,级别3
|
||
$this->debug(3, "Cached file's modification time is $mtime");
|
||
}
|
||
//如果没有获取到缓存文件最后修改时间,说明没有缓存,退出
|
||
if (!$mtime) {
|
||
return false;
|
||
}
|
||
//将浏览器中存储的上次修改时间转为时间戳
|
||
$iftime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
|
||
//写日志,记录UNIX时间戳,级别3
|
||
$this->debug(3, "The conditional get's if-modified-since unixtime is $iftime");
|
||
//如果这个时间小于1秒,说明值无效,退出
|
||
if ($iftime < 1) {
|
||
//写日志,记录此值无效
|
||
$this->debug(3, "Got an invalid conditional get modified since time. Returning false.");
|
||
return false;
|
||
}
|
||
//如果浏览器存储的时间小于实际缓存文件的最后修改时间,也就是说距上次访问后,文件被更改了,要重新请求页面
|
||
if ($iftime < $mtime) {
|
||
//写日志,记录文件已被更改,级别3
|
||
$this->debug(3, "File has been modified since last fetch.");
|
||
return false;
|
||
//否则就不用重新请求页面,直接读取缓存
|
||
} else {
|
||
//写日志,记录缓存有效,直接读取缓存,级别3
|
||
$this->debug(3, "File has not been modified since last get, so serving a 304.");
|
||
//设置HTTP头响应码为304
|
||
header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
|
||
//记录此次操作,级别1
|
||
$this->debug(1, "Returning 304 not modified");
|
||
//读取成功返回真
|
||
return true;
|
||
}
|
||
}
|
||
//没有读取到缓存,返回假
|
||
return false;
|
||
}
|
||
|
||
/*此函数用来运行缓存文件的GC和读取服务器上的缓存文件*/
|
||
protected function tryServerCache()
|
||
{
|
||
//写日志,记录将读取服务端缓存,级别3
|
||
$this->debug(3, "Trying server cache");
|
||
//如果缓存文件存在
|
||
if (file_exists($this->cachefile)) {
|
||
//写日志,记录缓存文件存在
|
||
$this->debug(3, "Cachefile {$this->cachefile} exists");
|
||
//如果请求的是外部图片地址
|
||
if ($this->isURL) {
|
||
//写日志,记录这是一次外部请求,级别3
|
||
$this->debug(3, "This is an external request, so checking if the cachefile is empty which means the request failed previously.");
|
||
//如果缓存文件的大小小于1,也就是说是一个无效的缓存文件
|
||
if (filesize($this->cachefile) < 1) {
|
||
//写日志,记录这是一个空的缓存文件,级别3
|
||
$this->debug(3, "Found an empty cachefile indicating a failed earlier request. Checking how old it is.");
|
||
//如果已到了配置文件中清理无效缓存的时间
|
||
if (time() - @filemtime($this->cachefile) > WAIT_BETWEEN_FETCH_ERRORS) {
|
||
//写日志,记录这次删除操作,级别3
|
||
$this->debug(3, "File is older than " . WAIT_BETWEEN_FETCH_ERRORS . " seconds. Deleting and returning false so app can try and load file.");
|
||
//删除此缓存文件
|
||
@unlink($this->cachefile);
|
||
//返回假,说明没有读取到服务端缓存
|
||
return false;
|
||
//否则,空的缓存文件说明上次请求失败,所以要写错误记录
|
||
} else {
|
||
//写日志,记录空的缓存文件依然有效,级别3
|
||
$this->debug(3, "Empty cachefile is still fresh so returning message saying we had an error fetching this image from remote host.");
|
||
//设置404错误
|
||
$this->set404();
|
||
//设置错误信息
|
||
$this->error("An error occured fetching image.");
|
||
//返回假代表没有得到缓存
|
||
return false;
|
||
}
|
||
}
|
||
//否则就是正确的缓存文件
|
||
} else {
|
||
//写日志,记录将要直接读取缓存文件,级别3
|
||
$this->debug(3, "Trying to serve cachefile {$this->cachefile}");
|
||
}
|
||
//如果输出图像缓存成功
|
||
if ($this->serveCacheFile()) {
|
||
//写日志,记录缓存文件信息,级别3
|
||
$this->debug(3, "Succesfully served cachefile {$this->cachefile}");
|
||
return true;
|
||
//如果不成功
|
||
} else {
|
||
//写日志,记录错误信息,级别3
|
||
$this->debug(3, "Failed to serve cachefile {$this->cachefile} - Deleting it from cache.");
|
||
//删除此无效缓存,以便下次请求能重新创建
|
||
@unlink($this->cachefile);
|
||
//同样返回真,因为在serverCacheFile已经记录了错误信息
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*此函数用来记录错误信息*/
|
||
protected function error($err)
|
||
{
|
||
//写记录,记录错误信息,级别3
|
||
$this->debug(3, "Adding error message: $err");
|
||
//记录到错误信息数组
|
||
$this->errors[] = $err;
|
||
return false;
|
||
}
|
||
|
||
/*测函数用来检测存储错误信息的数组中是否有内容,也就是说在上一个操作中,是否有错误*/
|
||
protected function haveErrors()
|
||
{
|
||
if (sizeof($this->errors) > 0) {
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/*此函数输出已存储的错误信息*/
|
||
protected function serveErrors()
|
||
{
|
||
//设置http头
|
||
header($_SERVER['SERVER_PROTOCOL'] . ' 400 Bad Request');
|
||
//循环输出错误列表信息
|
||
$html = '<ul>';
|
||
foreach ($this->errors as $err) {
|
||
$html .= '<li>' . htmlentities($err) . '</li>';
|
||
}
|
||
$html .= '</ul>';
|
||
//输出其他错误信息
|
||
echo '<h1>A TimThumb error has occured</h1>The following error(s) occured:<br />' . $html . '<br />';
|
||
echo '<br />Query String : ' . htmlentities($_SERVER['QUERY_STRING']);
|
||
echo '<br />TimThumb version : ' . VERSION . '</pre>';
|
||
}
|
||
|
||
/*此函数用来读取本地图片*/
|
||
protected function serveInternalImage()
|
||
{
|
||
//写日志,记录本地图片地址
|
||
$this->debug(3, "Local image path is $this->localImage");
|
||
//如果地址无效
|
||
if (!$this->localImage) {
|
||
//记录此错误,并退出执行
|
||
$this->sanityFail("localImage not set after verifying it earlier in the code.");
|
||
return false;
|
||
}
|
||
//获取本地图片大小
|
||
$fileSize = filesize($this->localImage);
|
||
//如果本地图片的尺寸超过配置文件的相关设置
|
||
if ($fileSize > MAX_FILE_SIZE) {
|
||
//记录错误原因,并退出
|
||
$this->error("The file you specified is greater than the maximum allowed file size.");
|
||
return false;
|
||
}
|
||
//如果获取到的图片尺寸无效
|
||
if ($fileSize <= 0) {
|
||
//记录错误并退出
|
||
$this->error("The file you specified is <= 0 bytes.");
|
||
return false;
|
||
}
|
||
//如果通过了以上验证,则写日志,记录将用processImageAndWriteToCache函数处理本地图片
|
||
$this->debug(3, "Calling processImageAndWriteToCache() for local image.");
|
||
//处理成功则从缓存返回图片
|
||
if ($this->processImageAndWriteToCache($this->localImage)) {
|
||
$this->serveCacheFile();
|
||
return true;
|
||
//失败则返回假
|
||
} else {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/*此函数用来清理缓存*/
|
||
protected function cleanCache()
|
||
{
|
||
//如果定义的缓存时间小于0,则退出
|
||
if (FILE_CACHE_TIME_BETWEEN_CLEANS < 0) {
|
||
return;
|
||
}
|
||
//写日志,记录清除缓存操作,级别3
|
||
$this->debug(3, "cleanCache() called");
|
||
//此文件为记录上次进行清除缓存操作的时间戳文件
|
||
$lastCleanFile = $this->cacheDirectory . '/timthumb_cacheLastCleanTime.touch';
|
||
|
||
//如果上面定义的文件不存在,说明这是第一次进行清除缓存操作,创建此文件并返回空即可
|
||
if (!is_file($lastCleanFile)) {
|
||
//写日志,记录创建文件,级别1
|
||
$this->debug(1, "File tracking last clean doesn't exist. Creating $lastCleanFile");
|
||
//创建此文件
|
||
if (!touch($lastCleanFile)) {
|
||
//失败的话报错并退出
|
||
$this->error("Could not create cache clean timestamp file.");
|
||
}
|
||
return;
|
||
}
|
||
//如果已超过缓存时间
|
||
if (@filemtime($lastCleanFile) < (time() - FILE_CACHE_TIME_BETWEEN_CLEANS)) {
|
||
//写日志,记录下面进行的清除缓存操作
|
||
$this->debug(1, "Cache was last cleaned more than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago. Cleaning now.");
|
||
//创建新的清除缓存时间戳文件
|
||
if (!touch($lastCleanFile)) {
|
||
//失败的话记录错误信息
|
||
$this->error("Could not create cache clean timestamp file.");
|
||
}
|
||
//此数组存的是所有缓存文件,根据前面定义的缓存文件目录和缓存文件后缀得到的
|
||
$files = glob($this->cacheDirectory . '/*' . FILE_CACHE_SUFFIX);
|
||
//如果有缓存文件
|
||
if ($files) {
|
||
//计算当前时间和缓存最大生存时间的差值,用于下面判断缓存文件是否删除
|
||
$timeAgo = time() - FILE_CACHE_MAX_FILE_AGE;
|
||
//遍历缓存文件数组
|
||
foreach ($files as $file) {
|
||
//如果文件创建时间小于上面计算的值,也就是说此缓存文件的死期到了,就删除它
|
||
if (@filemtime($file) < $timeAgo) {
|
||
//记录删除缓存文件,级别3
|
||
$this->debug(3, "Deleting cache file $file older than max age: " . FILE_CACHE_MAX_FILE_AGE . " seconds");
|
||
@unlink($file);
|
||
}
|
||
}
|
||
}
|
||
return true;
|
||
//如果没超过缓存时间,则不用清除
|
||
} else {
|
||
//写日志,记录不用清除缓存
|
||
$this->debug(3, "Cache was cleaned less than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago so no cleaning needed.");
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/*核心函数,处理图片并写入缓存*/
|
||
protected function processImageAndWriteToCache($localImage)
|
||
{
|
||
//获取图片信息
|
||
$sData = getimagesize($localImage);
|
||
//图像类型标记
|
||
$origType = $sData[2];
|
||
//mime类型
|
||
$mimeType = $sData['mime'];
|
||
//写日志,记录传入图像的mime类型
|
||
$this->debug(3, "Mime type of image is $mimeType");
|
||
//进行图像mime类型验证,只允许gif , jpg 和 png
|
||
if (!preg_match('/^image\/(?:gif|jpg|jpeg|png)$/i', $mimeType)) {
|
||
//如果不是这四种类型,记录错误信息,并退出脚本
|
||
return $this->error("The image being resized is not a valid gif, jpg or png.");
|
||
}
|
||
//图片处理需要GD库支持,这里检测是否安装了GD库
|
||
if (!function_exists('imagecreatetruecolor')) {
|
||
//没有安装的话推出脚本
|
||
return $this->error('GD Library Error: imagecreatetruecolor does not exist - please contact your webhost and ask them to install the GD library');
|
||
}
|
||
//如果安装了GD库,并且支持图像过滤器函数imagefilter,且支持IMG_FILTER_NEGATE常量
|
||
if (function_exists('imagefilter') && defined('IMG_FILTER_NEGATE')) {
|
||
//定义一个过滤器效果数组,后面的数字代表需要额外传入的参数
|
||
$imageFilters = array(
|
||
//负片
|
||
1 => array(IMG_FILTER_NEGATE, 0),
|
||
//黑白的
|
||
2 => array(IMG_FILTER_GRAYSCALE, 0),
|
||
//亮度级别
|
||
3 => array(IMG_FILTER_BRIGHTNESS, 1),
|
||
//对比度级别
|
||
4 => array(IMG_FILTER_CONTRAST, 1),
|
||
//图像转换为制定颜色
|
||
5 => array(IMG_FILTER_COLORIZE, 4),
|
||
//突出边缘
|
||
6 => array(IMG_FILTER_EDGEDETECT, 0),
|
||
//浮雕
|
||
7 => array(IMG_FILTER_EMBOSS, 0),
|
||
//用高斯算法模糊图像
|
||
8 => array(IMG_FILTER_GAUSSIAN_BLUR, 0),
|
||
//模糊图像
|
||
9 => array(IMG_FILTER_SELECTIVE_BLUR, 0),
|
||
//平均移除法来达到轮廓效果
|
||
10 => array(IMG_FILTER_MEAN_REMOVAL, 0),
|
||
//平滑处理
|
||
11 => array(IMG_FILTER_SMOOTH, 0),
|
||
);
|
||
}
|
||
|
||
//生成图片宽度,由get中w参数指定,默认为0
|
||
$new_width = (int)abs($this->param('w', 0));
|
||
//生成图片高度,由get中h参数指定,默认为0
|
||
$new_height = (int)abs($this->param('h', 0));
|
||
//生成图片缩放模式,由get中zc参数指定,默认为配置文件中DEFAULT_ZC的值
|
||
$zoom_crop = (int)$this->param('zc', DEFAULT_ZC);
|
||
//生成图片的质量,由get中q参数指定,默认为配置文件中DEFAULT_Q的值
|
||
$quality = (int)abs($this->param('q', DEFAULT_Q));
|
||
//裁剪的位置
|
||
$align = $this->cropTop ? 't' : $this->param('a', 'c');
|
||
//需要进行的图片处理操作,多个过滤器用"|"分割,可选参数请参看$imageFilters处的注释,由于不同的过滤器需要的参数不同,如一个过滤器需要多个参数,多个参数用,分隔。例:1,2|3,1,1 代表对图像分别应用1和3过滤效果,1和3所对应的过滤效果是由$imageFilters数组确定的,其中1号过滤器还需要一个额外的参数,这里传了1,3号过滤器还需要2个额外的参数,这里传了1和1.
|
||
$filters = $this->param('f', DEFAULT_F);
|
||
//是否对图片进行锐化,由get中s参数指定,默认为配置文件中DEFAULT_S的值
|
||
$sharpen = (bool)$this->param('s', DEFAULT_S);
|
||
//生成图片的默认背景画布颜色,由get中cc参数指定,默认为配置文件中DEFAULT_CC的值
|
||
$canvas_color = $this->param('cc', DEFAULT_CC);
|
||
//生成png图片的背景是否透明
|
||
$canvas_trans = (bool)$this->param('ct', '1');
|
||
|
||
// 如果高度和宽度都没有指定,设置他们为100*100
|
||
if ($new_width == 0 && $new_height == 0) {
|
||
$new_width = 100;
|
||
$new_height = 100;
|
||
}
|
||
|
||
// 限制最大高度和最大宽度
|
||
$new_width = min($new_width, MAX_WIDTH);
|
||
$new_height = min($new_height, MAX_HEIGHT);
|
||
|
||
// 检测并设置php运行最大占用内存
|
||
$this->setMemoryLimit();
|
||
|
||
// 打开图像资源
|
||
$image = $this->openImage($mimeType, $localImage);
|
||
//如果打开失败,记录信息并退出脚本
|
||
if ($image === false) {
|
||
return $this->error('Unable to open image.');
|
||
}
|
||
|
||
// 获得原始图片,也就是上面打开图片的宽和高
|
||
$width = imagesx($image);
|
||
$height = imagesy($image);
|
||
$origin_x = 0;
|
||
$origin_y = 0;
|
||
|
||
// 如果新生成图片的宽或高没有指定,则用此等比算法算出高或宽的值
|
||
if ($new_width && !$new_height) {
|
||
$new_height = floor($height * ($new_width / $width));
|
||
} else if ($new_height && !$new_width) {
|
||
$new_width = floor($width * ($new_height / $height));
|
||
}
|
||
|
||
// 如果缩放模式选择的是3,也就是说get中zc=3或者配置文件中DEFAULT_ZC=3,则进行等比缩放,不裁剪
|
||
if ($zoom_crop == 3) {
|
||
|
||
$final_height = $height * ($new_width / $width);
|
||
//根据等比算法设置等比计算后的宽或高
|
||
if ($final_height > $new_height) {
|
||
$new_width = $width * ($new_height / $height);
|
||
} else {
|
||
$new_height = $final_height;
|
||
}
|
||
|
||
}
|
||
|
||
// 利用处理完毕的长和宽创建新画布,
|
||
$canvas = imagecreatetruecolor($new_width, $new_height);
|
||
//关闭混色模式,也就是把PNG的alpha值保存,从而使背景透明
|
||
imagealphablending($canvas, false);
|
||
//进行默认画布颜色的检测并转换,如果给出的是3个字符长度表示的颜色值
|
||
if (strlen($canvas_color) == 3) { //if is 3-char notation, edit string into 6-char notation
|
||
//转换为6个字符表示的颜色值
|
||
$canvas_color = str_repeat(substr($canvas_color, 0, 1), 2) . str_repeat(substr($canvas_color, 1, 1), 2) . str_repeat(substr($canvas_color, 2, 1), 2);
|
||
//如果不是3个长度也不是6个长度的字符串,则为非法字符串,设置为默认值
|
||
} else if (strlen($canvas_color) != 6) {
|
||
$canvas_color = DEFAULT_CC;
|
||
}
|
||
//将上面得到的R 、G 、B 三种颜色值转换为10进制表示
|
||
$canvas_color_R = hexdec(substr($canvas_color, 0, 2));
|
||
$canvas_color_G = hexdec(substr($canvas_color, 2, 2));
|
||
$canvas_color_B = hexdec(substr($canvas_color, 4, 2));
|
||
|
||
// 如果传入图片的格式是png,并且配置文件设置png背景颜色为透明,并且在get传入了ct的值为真,那么就设置背景颜色为透明
|
||
if (preg_match('/^image\/png$/i', $mimeType) && !PNG_IS_TRANSPARENT && $canvas_trans) {
|
||
$color = imagecolorallocatealpha($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 127);
|
||
//反之设置为不透明
|
||
} else {
|
||
$color = imagecolorallocatealpha($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 0);
|
||
}
|
||
|
||
// 使用分配的颜色填充背景
|
||
imagefill($canvas, 0, 0, $color);
|
||
|
||
|
||
// 如果缩放模式选择的是2,那么画布的体积是按传入的值创建的,并计算出边框的宽度
|
||
if ($zoom_crop == 2) {
|
||
//等比缩放的高度
|
||
$final_height = $height * ($new_width / $width);
|
||
//如果计算出的等比高度,大于传入的高度
|
||
if ($final_height > $new_height) {
|
||
//origin_x等于传入的新高度的二分之一
|
||
$origin_x = $new_width / 2;
|
||
//设置新宽度为等比计算出的值
|
||
$new_width = $width * ($new_height / $height);
|
||
//计算出两次origin_x的差值
|
||
$origin_x = round($origin_x - ($new_width / 2));
|
||
//否则,计算出两次origin_y的差值
|
||
} else {
|
||
$origin_y = $new_height / 2;
|
||
$new_height = $final_height;
|
||
$origin_y = round($origin_y - ($new_height / 2));
|
||
|
||
}
|
||
|
||
}
|
||
|
||
// 保存图像时保存完整的alpha信息
|
||
imagesavealpha($canvas, true);
|
||
|
||
//如果缩放模式选择的是1或2或3
|
||
if ($zoom_crop > 0) {
|
||
|
||
$src_x = $src_y = 0;
|
||
//图片原宽度
|
||
$src_w = $width;
|
||
//图片原高度
|
||
$src_h = $height;
|
||
|
||
//图片纵横比
|
||
$cmp_x = $width / $new_width;
|
||
$cmp_y = $height / $new_height;
|
||
|
||
//裁剪算法
|
||
if ($cmp_x > $cmp_y) {
|
||
$src_w = round($width / $cmp_x * $cmp_y);
|
||
$src_x = round(($width - ($width / $cmp_x * $cmp_y)) / 2);
|
||
|
||
} else if ($cmp_y > $cmp_x) {
|
||
|
||
$src_h = round($height / $cmp_y * $cmp_x);
|
||
$src_y = round(($height - ($height / $cmp_y * $cmp_x)) / 2);
|
||
|
||
}
|
||
|
||
// 根据传入参数算出裁剪的位置
|
||
if ($align) {
|
||
if (strpos($align, 't') !== false) {
|
||
$src_y = 0;
|
||
}
|
||
if (strpos($align, 'b') !== false) {
|
||
$src_y = $height - $src_h;
|
||
}
|
||
if (strpos($align, 'l') !== false) {
|
||
$src_x = 0;
|
||
}
|
||
if (strpos($align, 'r') !== false) {
|
||
$src_x = $width - $src_w;
|
||
}
|
||
}
|
||
|
||
//将图像根据算法进行裁剪,并拷贝到背景图片上
|
||
imagecopyresampled($canvas, $image, $origin_x, $origin_y, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h);
|
||
|
||
} else {
|
||
|
||
//裁剪模式选择的是0,则不进行裁剪,并生成图像
|
||
imagecopyresampled($canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
|
||
|
||
}
|
||
//如果定义了图片处理操作,并且支持图片处理函数
|
||
if ($filters != '' && function_exists('imagefilter') && defined('IMG_FILTER_NEGATE')) {
|
||
// 分割每个过滤处理
|
||
$filterList = explode('|', $filters);
|
||
foreach ($filterList as $fl) {
|
||
//分割一个过滤操作中的参数
|
||
$filterSettings = explode(',', $fl);
|
||
//如果所选的过滤操作存在
|
||
if (isset ($imageFilters[$filterSettings[0]])) {
|
||
//将所有参数转为int类型
|
||
for ($i = 0; $i < 4; $i++) {
|
||
if (!isset ($filterSettings[$i])) {
|
||
$filterSettings[$i] = null;
|
||
} else {
|
||
$filterSettings[$i] = (int)$filterSettings[$i];
|
||
}
|
||
}
|
||
//根据$imageFilters中定义的每个过滤效果需要的参数的不同,对图像应用过滤器效果
|
||
switch ($imageFilters[$filterSettings[0]][1]) {
|
||
|
||
case 1:
|
||
|
||
imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1]);
|
||
break;
|
||
|
||
case 2:
|
||
|
||
imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2]);
|
||
break;
|
||
|
||
case 3:
|
||
|
||
imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3]);
|
||
break;
|
||
|
||
case 4:
|
||
|
||
imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3], $filterSettings[4]);
|
||
break;
|
||
|
||
default:
|
||
|
||
imagefilter($canvas, $imageFilters[$filterSettings[0]][0]);
|
||
break;
|
||
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 如果设置了锐化值,并且系统支持锐化函数,则进行锐化操作
|
||
if ($sharpen && function_exists('imageconvolution')) {
|
||
|
||
$sharpenMatrix = array(
|
||
array(-1, -1, -1),
|
||
array(-1, 16, -1),
|
||
array(-1, -1, -1),
|
||
);
|
||
|
||
$divisor = 8;
|
||
$offset = 0;
|
||
|
||
imageconvolution($canvas, $sharpenMatrix, $divisor, $offset);
|
||
|
||
}
|
||
//如果图片是PNG或者GIF,则用imagetruecolortopalette来减小他们的体积
|
||
if ((IMAGETYPE_PNG == $origType || IMAGETYPE_GIF == $origType) && function_exists('imageistruecolor') && !imageistruecolor($image) && imagecolortransparent($image) > 0) {
|
||
imagetruecolortopalette($canvas, false, imagecolorstotal($image));
|
||
}
|
||
//根据生成的不同图片类型,生成图片缓存,$imgType的值用于生成安全头
|
||
$imgType = "";
|
||
$tempfile = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
|
||
if (preg_match('/^image\/(?:jpg|jpeg)$/i', $mimeType)) {
|
||
$imgType = 'jpg';
|
||
imagejpeg($canvas, $tempfile, $quality);
|
||
} else if (preg_match('/^image\/png$/i', $mimeType)) {
|
||
$imgType = 'png';
|
||
imagepng($canvas, $tempfile, floor($quality * 0.09));
|
||
} else if (preg_match('/^image\/gif$/i', $mimeType)) {
|
||
$imgType = 'gif';
|
||
imagegif($canvas, $tempfile);
|
||
} else {
|
||
//如果不是以上三种类型,记录这次错误并退出
|
||
return $this->sanityFail("Could not match mime type after verifying it previously.");
|
||
}
|
||
//优先使用optipng工具进行png图片的压缩,前提是你装了这个工具
|
||
if ($imgType == 'png' && OPTIPNG_ENABLED && OPTIPNG_PATH && @is_file(OPTIPNG_PATH)) {
|
||
//记录optipng的地址
|
||
$exec = OPTIPNG_PATH;
|
||
//写日志,记录optipng将运行,级别3
|
||
$this->debug(3, "optipng'ing $tempfile");
|
||
//获取图片大小
|
||
$presize = filesize($tempfile);
|
||
//进行图片压缩操作
|
||
$out = `$exec -o1 $tempfile`;
|
||
//清除文件状态缓存
|
||
clearstatcache();
|
||
//获取压缩后的文件大小
|
||
$aftersize = filesize($tempfile);
|
||
//算出压缩了多大
|
||
$sizeDrop = $presize - $aftersize;
|
||
//根据算出的不同的值,写日志,级别1
|
||
if ($sizeDrop > 0) {
|
||
$this->debug(1, "optipng reduced size by $sizeDrop");
|
||
} else if ($sizeDrop < 0) {
|
||
$this->debug(1, "optipng increased size! Difference was: $sizeDrop");
|
||
} else {
|
||
$this->debug(1, "optipng did not change image size.");
|
||
}
|
||
//optipng不存在,就尝试使用pngcrush
|
||
} else if ($imgType == 'png' && PNGCRUSH_ENABLED && PNGCRUSH_PATH && @is_file(PNGCRUSH_PATH)) {
|
||
$exec = PNGCRUSH_PATH;
|
||
//和optipng不同的是,pngcrush会将处理完的文件新生成一个文件,所以这里新建个文件
|
||
$tempfile2 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
|
||
//写日志,记录文件名
|
||
$this->debug(3, "pngcrush'ing $tempfile to $tempfile2");
|
||
//运行pngcrush
|
||
$out = `$exec $tempfile $tempfile2`;
|
||
$todel = "";
|
||
//如果生成文件成功
|
||
if (is_file($tempfile2)) {
|
||
//算出压缩后的文件大小的差值
|
||
$sizeDrop = filesize($tempfile) - filesize($tempfile2);
|
||
//如果是一次有效的压缩,则将压缩后的文件作为缓存文件
|
||
if ($sizeDrop > 0) {
|
||
$this->debug(1, "pngcrush was succesful and gave a $sizeDrop byte size reduction");
|
||
$todel = $tempfile;
|
||
$tempfile = $tempfile2;
|
||
//否则的话则这个文件没有存在的必要
|
||
} else {
|
||
$this->debug(1, "pngcrush did not reduce file size. Difference was $sizeDrop bytes.");
|
||
$todel = $tempfile2;
|
||
}
|
||
//没有运行成功也需要删除这个文件
|
||
} else {
|
||
$this->debug(3, "pngcrush failed with output: $out");
|
||
$todel = $tempfile2;
|
||
}
|
||
//删除无效文件或压缩前比较大的文件
|
||
@unlink($todel);
|
||
}
|
||
//在缓存图片上写入安全头
|
||
$this->debug(3, "Rewriting image with security header.");
|
||
//创建一个新的缓存文件
|
||
$tempfile4 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
|
||
//
|
||
$context = stream_context_create();
|
||
//读取生成的图片缓存内容
|
||
$fp = fopen($tempfile, 'r', 0, $context);
|
||
//向新缓存文件写入安全头,安全头的长度应该总是$this->filePrependSecurityBlock的长度 + 6
|
||
file_put_contents($tempfile4, $this->filePrependSecurityBlock . $imgType . ' ?' . '>');
|
||
//将读取出来的缓存图片内容写入新缓存文件
|
||
file_put_contents($tempfile4, $fp, FILE_APPEND);
|
||
//关闭文件资源
|
||
fclose($fp);
|
||
//删除之前不安全的图片缓存文件
|
||
@unlink($tempfile);
|
||
//写日志,给缓存文件加锁~~
|
||
$this->debug(3, "Locking and replacing cache file.");
|
||
//创建锁文件文件名
|
||
$lockFile = $this->cachefile . '.lock';
|
||
//创建或打开锁文件
|
||
$fh = fopen($lockFile, 'w');
|
||
//创建失败直接退出
|
||
if (!$fh) {
|
||
return $this->error("Could not open the lockfile for writing an image.");
|
||
}
|
||
//如果给锁文件加入写入锁成功
|
||
if (flock($fh, LOCK_EX)) {
|
||
//删除原缓存文件
|
||
@unlink($this->cachefile);
|
||
//重命名覆盖,将安全的缓存文件作为缓存文件
|
||
rename($tempfile4, $this->cachefile);
|
||
//释放写入锁
|
||
flock($fh, LOCK_UN);
|
||
//释放资源
|
||
fclose($fh);
|
||
//删除锁文件
|
||
@unlink($lockFile);
|
||
//否则
|
||
} else {
|
||
//关闭资源
|
||
fclose($fh);
|
||
//删除锁文件
|
||
@unlink($lockFile);
|
||
//删除安全的缓存文件
|
||
@unlink($tempfile4);
|
||
//记录错误并退出
|
||
return $this->error("Could not get a lock for writing.");
|
||
}
|
||
//写日志,记录操作完成
|
||
$this->debug(3, "Done image replace with security header. Cleaning up and running cleanCache()");
|
||
//释放图片资源
|
||
imagedestroy($canvas);
|
||
imagedestroy($image);
|
||
//生成缓存成功返回真
|
||
return true;
|
||
}
|
||
|
||
/*此函数用来获取服务器文档根目录*/
|
||
protected function calcDocRoot()
|
||
{
|
||
//直接获取文档根目录
|
||
$docRoot = @$_SERVER['DOCUMENT_ROOT'];
|
||
//如果定义了LOCAL_FILE_BASE_DIRECTORY,则使用此值
|
||
if (defined('LOCAL_FILE_BASE_DIRECTORY')) {
|
||
$docRoot = LOCAL_FILE_BASE_DIRECTORY;
|
||
}
|
||
//如果没有获取到文档根目录,也就是DOCUMENT_ROOT的值
|
||
if (!isset($docRoot)) {
|
||
//写一条记录,说明DOCUMENT_ROOT没找到,注意level是3
|
||
$this->debug(3, "DOCUMENT_ROOT is not set. This is probably windows. Starting search 1.");
|
||
//用SCRIPT_FILENAME和PHP_SELF来得到文档根目录
|
||
if (isset($_SERVER['SCRIPT_FILENAME'])) {
|
||
$docRoot = str_replace('\\', '/', substr($_SERVER['SCRIPT_FILENAME'], 0, 0 - strlen($_SERVER['PHP_SELF'])));
|
||
//写一条记录,说明DOCUMENT_ROOT的值是通过SCRIPT_FILENAME和PHP_SELF来得的,级别3
|
||
$this->debug(3, "Generated docRoot using SCRIPT_FILENAME and PHP_SELF as: $docRoot");
|
||
}
|
||
}
|
||
//如果还是没有获取到文档根目录
|
||
if (!isset($docRoot)) {
|
||
//先写一条记录,说明还是没得到DOCUMENT_ROOT,级别3
|
||
$this->debug(3, "DOCUMENT_ROOT still is not set. Starting search 2.");
|
||
//通过PATH_TRANSLATED和PHP_SELF来得到文档根目录,关于PATH_TRANSLATED的说明可以看这里:http://blogs.msdn.com/b/david.wang/archive/2005/08/04/what-is-path-translated.aspx
|
||
if (isset($_SERVER['PATH_TRANSLATED'])) {
|
||
$docRoot = str_replace('\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0 - strlen($_SERVER['PHP_SELF'])));
|
||
//写记录,说明说明DOCUMENT_ROOT的值是通过PATH_TRANSLATED和PHP_SELF来得的,级别3
|
||
$this->debug(3, "Generated docRoot using PATH_TRANSLATED and PHP_SELF as: $docRoot");
|
||
}
|
||
}
|
||
//如果文档根目录不是服务器根目录,则去掉最后一个 '/'
|
||
if ($docRoot && $_SERVER['DOCUMENT_ROOT'] != '/') {
|
||
$docRoot = preg_replace('/\/$/', '', $docRoot);
|
||
}
|
||
//写记录,说明文档根目录的值,级别3
|
||
$this->debug(3, "Doc root is: " . $docRoot);
|
||
//赋值给成员属性
|
||
$this->docRoot = $docRoot;
|
||
|
||
}
|
||
|
||
/*此函数用来获取本地图片地址,参数src是相对与文档根目录的地址*/
|
||
protected function getLocalImagePath($src)
|
||
{
|
||
//去掉开头的 /
|
||
$src = ltrim($src, '/');
|
||
//如果前面没有获取到文档根目录,出于安全考虑,那么这里只能对timthumbs.php所在的目录下的图片进行操作
|
||
if (!$this->docRoot) {
|
||
//写日志,级别3,说明下面进行图片地址的检查
|
||
$this->debug(3, "We have no document root set, so as a last resort, lets check if the image is in the current dir and serve that.");
|
||
//获取去掉所有路径信息的文件名
|
||
$file = preg_replace('/^.*?([^\/\\\\]+)$/', '$1', $src);
|
||
//如果图片文件和timthumb.php在同一目录下
|
||
if (is_file($file)) {
|
||
//返回此图片的路径
|
||
return $this->realpath($file);
|
||
}
|
||
//如果图片文件和timthumb.php不在同一目录下,写错误信息,出于安全考虑,不会允许一个没有文档根目录并且在timthumbs.php所在的目录以外的文件
|
||
return $this->error("Could not find your website document root and the file specified doesn't exist in timthumbs directory. We don't support serving files outside timthumb's directory without a document root for security reasons.");
|
||
}
|
||
|
||
//尝试找这张图片,如果图片地址存在
|
||
if (file_exists($this->docRoot . '/' . $src)) {
|
||
//写日志,记录文件地址,级别3
|
||
$this->debug(3, "Found file as " . $this->docRoot . '/' . $src);
|
||
//返回图片路径
|
||
$real = $this->realpath($this->docRoot . '/' . $src);
|
||
//验证图片路径是否在本机
|
||
if (stripos($real, $this->docRoot) === 0) {
|
||
//是的话返回图片地址
|
||
return $real;
|
||
} else {
|
||
//否则写日志,没找到指定文件,级别1
|
||
$this->debug(1, "Security block: The file specified occurs outside the document root.");
|
||
}
|
||
}
|
||
|
||
//接着找。。。
|
||
$absolute = $this->realpath('/' . $src);
|
||
//如果决定地址存在
|
||
if ($absolute && file_exists($absolute)) {
|
||
//写日志,记录图片绝对地址,级别3
|
||
$this->debug(3, "Found absolute path: $absolute");
|
||
//如果文档根目录没有定义,记录这个错误信息
|
||
if (!$this->docRoot) {
|
||
$this->sanityFail("docRoot not set when checking absolute path.");
|
||
}
|
||
//验证图片路径是否在本机
|
||
if (stripos($absolute, $this->docRoot) === 0) {
|
||
//在的话返回图片地址
|
||
return $absolute;
|
||
} else {
|
||
//否则写日志,没找到指定的文件,级别1
|
||
$this->debug(1, "Security block: The file specified occurs outside the document root.");
|
||
}
|
||
}
|
||
|
||
//如果还没找到指定文件,则逐级向上查找
|
||
$base = $this->docRoot;
|
||
|
||
// 获取查询子目录列表
|
||
if (strstr($_SERVER['SCRIPT_FILENAME'], ':')) {
|
||
$sub_directories = explode('\\', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
|
||
} else {
|
||
$sub_directories = explode('/', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
|
||
}
|
||
//遍历子目录数组
|
||
foreach ($sub_directories as $sub) {
|
||
//重新组合请求地址
|
||
$base .= $sub . '/';
|
||
//写日志,记录搜索记录,级别3
|
||
$this->debug(3, "Trying file as: " . $base . $src);
|
||
//如果找到了这个文件
|
||
if (file_exists($base . $src)) {
|
||
//写日志,记录文件地址,级别3
|
||
$this->debug(3, "Found file as: " . $base . $src);
|
||
//得到实际地址
|
||
$real = $this->realpath($base . $src);
|
||
//如果实际地址的确在本机中,那么返回这个地址
|
||
if (stripos($real, $this->realpath($this->docRoot)) === 0) {
|
||
return $real;
|
||
} else {
|
||
//找不到就写日志,没找到,级别1
|
||
$this->debug(1, "Security block: The file specified occurs outside the document root.");
|
||
}
|
||
}
|
||
}
|
||
//还找不到的话,就返回false;
|
||
return false;
|
||
}
|
||
|
||
/*此函数用来获得传入文件参数的真实路径*/
|
||
protected function realpath($path)
|
||
{
|
||
//去除路径中带有..的相对路径
|
||
$remove_relatives = '/\w+\/\.\.\//';
|
||
while (preg_match($remove_relatives, $path)) {
|
||
$path = preg_replace($remove_relatives, '', $path);
|
||
}
|
||
//如果去除后路径中仍有..的相对路径,则用realpath函数返回路径,否则直接返回即可
|
||
return preg_match('#^\.\./|/\.\./#', $path) ? realpath($path) : $path;
|
||
}
|
||
|
||
/*此函数用来记录在析构函数中需要删除的资源列表*/
|
||
protected function toDelete($name)
|
||
{
|
||
//写日志,记录需要删除的文件信息
|
||
$this->debug(3, "Scheduling file $name to delete on destruct.");
|
||
//添加到待删除数组
|
||
$this->toDeletes[] = $name;
|
||
}
|
||
|
||
/*此函数是截图操作的具体实现*/
|
||
protected function serveWebshot()
|
||
{
|
||
//写日志,记录开始截图操作,级别3
|
||
$this->debug(3, "Starting serveWebshot");
|
||
//一段提示文字,可以到http://code.google.com/p/timthumb/上按照教程进行网站截图设置
|
||
$instr = "Please follow the instructions at http://code.google.com/p/timthumb/ to set your server up for taking website screenshots.";
|
||
//如果CutyCapt不存在
|
||
if (!is_file(WEBSHOT_CUTYCAPT)) {
|
||
//退出执行并记录,CutyCapt未被安装
|
||
return $this->error("CutyCapt is not installed. $instr");
|
||
}
|
||
//如果xvfb不存在
|
||
if (!is_file(WEBSHOT_XVFB)) {
|
||
//退出执行并记录,xvfb未被安装
|
||
return $this->Error("Xvfb is not installed. $instr");
|
||
}
|
||
//CUTYCAPT地址
|
||
$cuty = WEBSHOT_CUTYCAPT;
|
||
//xvfb地址
|
||
$xv = WEBSHOT_XVFB;
|
||
//截图屏幕宽度
|
||
$screenX = WEBSHOT_SCREEN_X;
|
||
//截图屏幕高度
|
||
$screenY = WEBSHOT_SCREEN_Y;
|
||
//截图色深
|
||
$colDepth = WEBSHOT_COLOR_DEPTH;
|
||
//截图保存格式
|
||
$format = WEBSHOT_IMAGE_FORMAT;
|
||
//截图超时时间,单位ms
|
||
$timeout = WEBSHOT_TIMEOUT * 1000;
|
||
//USER_AGENT头
|
||
$ua = WEBSHOT_USER_AGENT;
|
||
//是否启用js
|
||
$jsOn = WEBSHOT_JAVASCRIPT_ON ? 'on' : 'off';
|
||
//是否启用java
|
||
$javaOn = WEBSHOT_JAVA_ON ? 'on' : 'off';
|
||
//是否启用其他插件
|
||
$pluginsOn = WEBSHOT_PLUGINS_ON ? 'on' : 'off';
|
||
//是否启用代理
|
||
$proxy = WEBSHOT_PROXY ? ' --http-proxy=' . WEBSHOT_PROXY : '';
|
||
//在缓存文件目录,建立一个具有唯一文件名的文件,文件名前缀为timthumb_webshot,用户存储截图后的图片
|
||
$tempfile = tempnam($this->cacheDirectory, 'timthumb_webshot');
|
||
//目标网站地址
|
||
$url = $this->src;
|
||
//验证url合法性
|
||
if (!preg_match('/^https?:\/\/[a-zA-Z0-9\.\-]+/i', $url)) {
|
||
//不合法退出执行
|
||
return $this->error("Invalid URL supplied.");
|
||
}
|
||
//过滤掉非法字符
|
||
$url = preg_replace('/[^A-Za-z0-9\-\.\_\~:\/\?\#\[\]\@\!\$\&\'\(\)\*\+\,\;\=]+/', '', $url);
|
||
//优先使用CUTYCAPT
|
||
if (WEBSHOT_XVFB_RUNNING) {
|
||
//设置系统变量,配置图形输出显示。
|
||
putenv('DISPLAY=:100.0');
|
||
//组装shell命令
|
||
$command = "$cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
|
||
//否则使用XVFB
|
||
} else {
|
||
$command = "$xv --server-args=\"-screen 0, {$screenX}x{$screenY}x{$colDepth}\" $cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
|
||
}
|
||
//写日志,记录执行的命令,级别3
|
||
$this->debug(3, "Executing command: $command");
|
||
//执行命令并捕获输出
|
||
$out = `$command`;
|
||
//写日志,记录输出,级别3
|
||
$this->debug(3, "Received output: $out");
|
||
//如果刚刚创建的唯一文件名的文件失败
|
||
if (!is_file($tempfile)) {
|
||
//设置404错误
|
||
$this->set404();
|
||
//推出脚本
|
||
return $this->error("The command to create a thumbnail failed.");
|
||
}
|
||
//启用裁剪
|
||
$this->cropTop = true;
|
||
//对截取到的图片文件处理并生成缓存
|
||
if ($this->processImageAndWriteToCache($tempfile)) {
|
||
//成功的话写日志,并从缓存读取此图片
|
||
$this->debug(3, "Image processed succesfully. Serving from cache");
|
||
//返回从缓存中读取的文件内容
|
||
return $this->serveCacheFile();
|
||
//没成功就返回假咯
|
||
} else {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/*此函数用来从外部url获取图像*/
|
||
protected function serveExternalImage()
|
||
{
|
||
//验证url合法性
|
||
if (!preg_match('/^https?:\/\/[a-zA-Z0-9\-\.]+/i', $this->src)) {
|
||
$this->error("Invalid URL supplied.");
|
||
return false;
|
||
}
|
||
//生成临时缓存文件
|
||
$tempfile = tempnam($this->cacheDirectory, 'timthumb');
|
||
//写日志,记录读取外部图像到临时文件,级别3
|
||
$this->debug(3, "Fetching external image into temporary file $tempfile");
|
||
//将临时缓存文件加入到待删除列表
|
||
$this->toDelete($tempfile);
|
||
//请求url并将结果写入到临时缓存文件中,如果没有成功
|
||
if (!$this->getURL($this->src, $tempfile)) {
|
||
//删除此缓存文件
|
||
@unlink($this->cachefile);
|
||
|
||
//再创建一个新的缓存文件
|
||
touch($this->cachefile);
|
||
//写日志,记录错误信息,级别3
|
||
$this->debug(3, "Error fetching URL: " . $this->lastURLError);
|
||
//写错误信息,并退出
|
||
$this->error("Error reading the URL you specified from remote host." . $this->lastURLError);
|
||
return false;
|
||
}
|
||
//得到获取到图片的MIME类型
|
||
$mimeType = $this->getMimeType($tempfile);
|
||
//如果不在这三种类型中
|
||
if (!preg_match("/^image\/(?:jpg|jpeg|gif|png)$/i", $mimeType)) {
|
||
//写日志,记录错误信息,级别3
|
||
$this->debug(3, "Remote file has invalid mime type: $mimeType");
|
||
//删除现有缓存文件
|
||
@unlink($this->cachefile);
|
||
//创建新缓存文件
|
||
touch($this->cachefile);
|
||
//写错误信息并退出
|
||
$this->error("The remote file is not a valid image.");
|
||
return false;
|
||
}
|
||
//处理图像并缓存
|
||
if ($this->processImageAndWriteToCache($tempfile)) {
|
||
$this->debug(3, "Image processed succesfully. Serving from cache");
|
||
//成功的话返回缓存信息
|
||
return $this->serveCacheFile();
|
||
} else {
|
||
//失败返回假
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/*此函数用来将curl获取到的数据写入对应文件中*/
|
||
public static function curlWrite($h, $d)
|
||
{
|
||
//将数据写入文件
|
||
fwrite(self::$curlFH, $d);
|
||
//记录数据长度
|
||
self::$curlDataWritten += strlen($d);
|
||
//如果图片大小超过了配置文件的限制,则返回0
|
||
if (self::$curlDataWritten > MAX_FILE_SIZE) {
|
||
return 0;
|
||
//否则返回图片大小
|
||
} else {
|
||
return strlen($d);
|
||
}
|
||
}
|
||
|
||
/*此函数用来读取并输出服务端缓存*/
|
||
protected function serveCacheFile()
|
||
{
|
||
//写日志,记录读取缓存的地址
|
||
$this->debug(3, "Serving {$this->cachefile}");
|
||
//如果缓存地址无效
|
||
if (!is_file($this->cachefile)) {
|
||
//添加到错误记录
|
||
$this->error("serveCacheFile called in timthumb but we couldn't find the cached file.");
|
||
//停止执行脚本
|
||
return false;
|
||
}
|
||
//缓存地址有效的话,已只读方式打开文件
|
||
$fp = fopen($this->cachefile, 'rb');
|
||
//如果打开失败,直接退出脚本,并记录错误信息
|
||
if (!$fp) {
|
||
return $this->error("Could not open cachefile.");
|
||
}
|
||
//设定文件指针跳过filePrependSecurityBlock值,也就是跳过安全头后开始读
|
||
fseek($fp, strlen($this->filePrependSecurityBlock), SEEK_SET);
|
||
//读出文件的mime类型
|
||
$imgType = fread($fp, 3);
|
||
//再跳过这个mime类型的值
|
||
fseek($fp, 3, SEEK_CUR);
|
||
//如果现在文件的指针不是在安全头后6个字符的位置,说明缓存文件可能已损坏
|
||
if (ftell($fp) != strlen($this->filePrependSecurityBlock) + 6) {
|
||
//删除此缓存文件
|
||
@unlink($this->cachefile);
|
||
//记录错误并退出执行
|
||
return $this->error("The cached image file seems to be corrupt.");
|
||
}
|
||
//缓存图片的实际大小应该是文件大小 - 安全头大小
|
||
$imageDataSize = filesize($this->cachefile) - (strlen($this->filePrependSecurityBlock) + 6);
|
||
//设置输出必要的HTTP头
|
||
$this->sendImageHeaders($imgType, $imageDataSize);
|
||
//输出文件指针处所有剩余数据
|
||
$bytesSent = @fpassthru($fp);
|
||
//关闭文件资源
|
||
fclose($fp);
|
||
//如果此方法执行成功,则返回真
|
||
if ($bytesSent > 0) {
|
||
return true;
|
||
}
|
||
//如果fpassthru不成功,则用file_get_contents读取并输出
|
||
$content = file_get_contents($this->cachefile);
|
||
//如果读取成功
|
||
if ($content != FALSE) {
|
||
//截取掉安全头
|
||
$content = substr($content, strlen($this->filePrependSecurityBlock) + 6);
|
||
//输出图像
|
||
echo $content;
|
||
//写日志,记录读取缓存的方式
|
||
$this->debug(3, "Served using file_get_contents and echo");
|
||
return true;
|
||
//读取失败的话记录错误信息并退出执行
|
||
} else {
|
||
$this->error("Cache file could not be loaded.");
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/*此函数设置图片输出必要的http头*/
|
||
protected function sendImageHeaders($mimeType, $dataSize)
|
||
{
|
||
//补全图片的mime信息
|
||
if (!preg_match('/^image\//i', $mimeType)) {
|
||
$mimeType = 'image/' . $mimeType;
|
||
}
|
||
//将jpg的mime类型写标准,这里不标准的原因是在验证文件安全头时追求了便利性
|
||
if (strtolower($mimeType) == 'image/jpg') {
|
||
$mimeType = 'image/jpeg';
|
||
}
|
||
//浏览器缓存失效时间
|
||
$gmdate_expires = gmdate('D, d M Y H:i:s', strtotime('now +10 days')) . ' GMT';
|
||
//文档最后被修改时间,用来让浏览器判断是否需要重新请求页面
|
||
$gmdate_modified = gmdate('D, d M Y H:i:s') . ' GMT';
|
||
// 设置HTTP头
|
||
header('Content-Type: ' . $mimeType);
|
||
header('Accept-Ranges: none');
|
||
header('Last-Modified: ' . $gmdate_modified);
|
||
header('Content-Length: ' . $dataSize);
|
||
//如果配置文件禁止浏览器缓存,则设置相应的HTTP头信息
|
||
if (BROWSER_CACHE_DISABLE) {
|
||
$this->debug(3, "Browser cache is disabled so setting non-caching headers.");
|
||
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
|
||
header("Pragma: no-cache");
|
||
header('Expires: ' . gmdate('D, d M Y H:i:s', time()));
|
||
//否则按配置文件设置缓存时间
|
||
} else {
|
||
$this->debug(3, "Browser caching is enabled");
|
||
header('Cache-Control: max-age=' . BROWSER_CACHE_MAX_AGE . ', must-revalidate');
|
||
header('Expires: ' . $gmdate_expires);
|
||
}
|
||
//运行成功返回真
|
||
return true;
|
||
}
|
||
|
||
/*自定义的验证函数*/
|
||
protected function securityChecks()
|
||
{
|
||
}
|
||
|
||
/*此函数用来获取$_GET数组中的参数,并允许设置默认值*/
|
||
protected function param($property, $default = '')
|
||
{
|
||
//如果参数存在则返回此参数
|
||
if (isset ($_GET[$property])) {
|
||
return $_GET[$property];
|
||
//不存在的话返回默认值
|
||
} else {
|
||
return $default;
|
||
}
|
||
}
|
||
|
||
/*此函数根据传入mime类型,打开图像资源*/
|
||
protected function openImage($mimeType, $src)
|
||
{
|
||
switch ($mimeType) {
|
||
case 'image/jpeg':
|
||
$image = imagecreatefromjpeg($src);
|
||
break;
|
||
|
||
case 'image/png':
|
||
$image = imagecreatefrompng($src);
|
||
break;
|
||
|
||
case 'image/gif':
|
||
$image = imagecreatefromgif($src);
|
||
break;
|
||
//不是这三种的话,脚本退出
|
||
default:
|
||
$this->error("Unrecognised mimeType");
|
||
}
|
||
//返回图像资源
|
||
return $image;
|
||
}
|
||
|
||
/*没啥说的,获取客户端IP*/
|
||
protected function getIP()
|
||
{
|
||
$rem = @$_SERVER["REMOTE_ADDR"];
|
||
$ff = @$_SERVER["HTTP_X_FORWARDED_FOR"];
|
||
$ci = @$_SERVER["HTTP_CLIENT_IP"];
|
||
if (preg_match('/^(?:192\.168|172\.16|10\.|127\.)/', $rem)) {
|
||
if ($ff) {
|
||
return $ff;
|
||
}
|
||
if ($ci) {
|
||
return $ci;
|
||
}
|
||
return $rem;
|
||
} else {
|
||
if ($rem) {
|
||
return $rem;
|
||
}
|
||
if ($ff) {
|
||
return $ff;
|
||
}
|
||
if ($ci) {
|
||
return $ci;
|
||
}
|
||
return "UNKNOWN";
|
||
}
|
||
}
|
||
|
||
/*debug运行日志函数,用来向系统日志记录操作信息*/
|
||
protected function debug($level, $msg)
|
||
{
|
||
//如果开启了debug,并且$level也就是调试级别小于等于配置文件中的值,则开始记录
|
||
if (DEBUG_ON && $level <= DEBUG_LEVEL) {
|
||
//格式化并记录开始时间,保留小数点后6位,这个时间代表实例化类后到这个debug执行所经历的时间
|
||
$execTime = sprintf('%.6f', microtime(true) - $this->startTime);
|
||
//这个值代表从上次debug结束,到这次debug的用时
|
||
$tick = sprintf('%.6f', 0);
|
||
//如果上次debug时间存在,则用当前时间减去上次debug时间,得出差值
|
||
if ($this->lastBenchTime > 0) {
|
||
$tick = sprintf('%.6f', microtime(true) - $this->lastBenchTime);
|
||
}
|
||
//将时间更新
|
||
$this->lastBenchTime = microtime(true);
|
||
//将debug信息写到系统日志中
|
||
error_log("TimThumb Debug line " . __LINE__ . " [$execTime : $tick]: $msg");
|
||
}
|
||
}
|
||
|
||
/*此函数用来记录未知BUG*/
|
||
protected function sanityFail($msg)
|
||
{
|
||
//记录BUG信息
|
||
return $this->error("There is a problem in the timthumb code. Message: Please report this error at <a href='http://code.google.com/p/timthumb/issues/list'>timthumb's bug tracking page</a>: $msg");
|
||
}
|
||
|
||
/*此函数用来返回图片文件的MIME信息*/
|
||
protected function getMimeType($file)
|
||
{
|
||
//获取图片文件的信息
|
||
$info = getimagesize($file);
|
||
//成功则返回MIME信息
|
||
if (is_array($info) && $info['mime']) {
|
||
return $info['mime'];
|
||
}
|
||
//失败返回空
|
||
return '';
|
||
}
|
||
|
||
/*此函数用来检测并设置php运行时最大占用内存的值*/
|
||
protected function setMemoryLimit()
|
||
{
|
||
//获取php.ini中的最大内存占用的值
|
||
$inimem = ini_get('memory_limit');
|
||
//将上面得到的值转换为以字节为单位的数值
|
||
$inibytes = timthumb::returnBytes($inimem);
|
||
//算出配置文件中内存限制的值
|
||
$ourbytes = timthumb::returnBytes(MEMORY_LIMIT);
|
||
//如果php配置文件中的值小于自己设定的值
|
||
if ($inibytes < $ourbytes) {
|
||
//则将php.ini配置中关于最大内存的值设置为自己设定的值
|
||
ini_set('memory_limit', MEMORY_LIMIT);
|
||
//写日志,记录改变内存操作,级别3
|
||
$this->debug(3, "Increased memory from $inimem to " . MEMORY_LIMIT);
|
||
//如果自己设置的值小于php.ini中的值
|
||
} else {
|
||
//则不进行任何操作,写日志记录此条信息即可,级别3
|
||
$this->debug(3, "Not adjusting memory size because the current setting is " . $inimem . " and our size of " . MEMORY_LIMIT . " is smaller.");
|
||
}
|
||
}
|
||
|
||
/*此函数将G, KB, MB 转为B(字节)*/
|
||
protected static function returnBytes($size_str)
|
||
{
|
||
//取最后一个单位值,进行转换操作,并返回转换后的值
|
||
switch (substr($size_str, -1)) {
|
||
case 'M':
|
||
case 'm':
|
||
return (int)$size_str * 1048576;
|
||
case 'K':
|
||
case 'k':
|
||
return (int)$size_str * 1024;
|
||
case 'G':
|
||
case 'g':
|
||
return (int)$size_str * 1073741824;
|
||
default:
|
||
return $size_str;
|
||
}
|
||
}
|
||
|
||
/*此函数用来将url中的资源读取到tempfile文件中*/
|
||
protected function getURL($url, $tempfile)
|
||
{
|
||
//重置上次url请求错误信息
|
||
$this->lastURLError = false;
|
||
//进行url编码
|
||
$url = preg_replace('/ /', '%20', $url);
|
||
//优先使用curl扩展
|
||
if (function_exists('curl_init')) {
|
||
//写日志,记录将使用curl扩展访问url,级别3
|
||
$this->debug(3, "Curl is installed so using it to fetch URL.");
|
||
//打开文件
|
||
self::$curlFH = fopen($tempfile, 'w');
|
||
//如果打开失败,记录错误信息并退出
|
||
if (!self::$curlFH) {
|
||
$this->error("Could not open $tempfile for writing.");
|
||
return false;
|
||
}
|
||
//重置写入长度
|
||
self::$curlDataWritten = 0;
|
||
//写日志,记录访问的url信息,级别3
|
||
$this->debug(3, "Fetching url with curl: $url");
|
||
//初始化curl
|
||
$curl = curl_init($url);
|
||
//curl选项设置
|
||
curl_setopt($curl, CURLOPT_TIMEOUT, CURL_TIMEOUT);
|
||
curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.122 Safari/534.30");
|
||
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
|
||
curl_setopt($curl, CURLOPT_HEADER, 0);
|
||
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
|
||
//关闭会话时执行curlWrite
|
||
curl_setopt($curl, CURLOPT_WRITEFUNCTION, 'Timthumb::curlWrite');
|
||
@curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
|
||
@curl_setopt($curl, CURLOPT_MAXREDIRS, 10);
|
||
//执行本次请求,并将结果赋给$curlResult
|
||
$curlResult = curl_exec($curl);
|
||
//释放文件资源
|
||
fclose(self::$curlFH);
|
||
//获取最后一个受到的HTTP码
|
||
$httpStatus = curl_getinfo($curl, CURLINFO_HTTP_CODE);
|
||
//如果是404,那么设置404错误并退出
|
||
if ($httpStatus == 404) {
|
||
$this->set404();
|
||
}
|
||
//如果请求成功
|
||
if ($curlResult) {
|
||
//关闭curl,并执行curlWrite将数据写到文件中
|
||
curl_close($curl);
|
||
//返回真,请求完成
|
||
return true;
|
||
//如果请求不成功
|
||
} else {
|
||
//记录错误信息
|
||
$this->lastURLError = curl_error($curl);
|
||
//关闭资源
|
||
curl_close($curl);
|
||
//执行不成功
|
||
return false;
|
||
}
|
||
//如果不支持curl,用file_get_contents获取数据
|
||
} else {
|
||
//获取数据
|
||
$img = @file_get_contents($url);
|
||
//如果获取失败
|
||
if ($img === false) {
|
||
//记录返回的错误信息数组
|
||
$err = error_get_last();
|
||
//如果记录到了,并且有错误信息
|
||
if (is_array($err) && $err['message']) {
|
||
//则记录这个错误信息
|
||
$this->lastURLError = $err['message'];
|
||
//否则的话记录整个错误信息
|
||
} else {
|
||
$this->lastURLError = $err;
|
||
}
|
||
//如果错误信息中有404,则设置为404错误
|
||
if (preg_match('/404/', $this->lastURLError)) {
|
||
$this->set404();
|
||
}
|
||
//返回假
|
||
return false;
|
||
}
|
||
//如果将读取的图片写入文件失败
|
||
if (!file_put_contents($tempfile, $img)) {
|
||
//写错误信息并退出执行
|
||
$this->error("Could not write to $tempfile.");
|
||
return false;
|
||
}
|
||
//没问题的话执行成功
|
||
return true;
|
||
}
|
||
|
||
}
|
||
|
||
/*此函数输出指定的图片,用于输出错误信息中*/
|
||
protected function serveImg($file)
|
||
{
|
||
//获取图像信息
|
||
$s = getimagesize($file);
|
||
//如果获取不到图像信息,推出
|
||
if (!($s && $s['mime'])) {
|
||
return false;
|
||
}
|
||
//设置http头,输出图片
|
||
header('Content-Type: ' . $s['mime']);
|
||
header('Content-Length: ' . filesize($file));
|
||
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
|
||
header("Pragma: no-cache");
|
||
//使用readfile输出图片
|
||
$bytes = @readfile($file);
|
||
if ($bytes > 0) {
|
||
return true;
|
||
}
|
||
//如果失败,使用file_get_contents和echo输出图片
|
||
$content = @file_get_contents($file);
|
||
if ($content != FALSE) {
|
||
echo $content;
|
||
return true;
|
||
}
|
||
//还失败的话返回假
|
||
return false;
|
||
}
|
||
|
||
/*此函数设置404 错误码*/
|
||
protected function set404()
|
||
{
|
||
$this->is404 = true;
|
||
}
|
||
|
||
/*此函数返回404错误码*/
|
||
protected function is404()
|
||
{
|
||
return $this->is404;
|
||
}
|
||
} |