DedeHttpDown PHP远程下载网页的类，增强版 2013-1-17修改
1）新增远程主机判断，节约服务器资源。避免远程主机不存在的时候仍旧fsockopen，导致的死机占用服务器CPU
（2）新增响应401的判断和支持。
（3）增加对json返回文本的支持。
（4）日志的生成，如果设置了DEBUG_LEVEL且为TRUE则会对每次远程下载做日志。
（5）获取字节的限定dataLimit，节约服务器资源。
（6）修改日期：2013-1-17
如果还有更好的方法建议，可以随时联系我本人。admin@zbphp.com
[php]
/**
* 织梦HTTP下载类
*
* @version $Id: dedehttpdown.class.php 1 11:42 2010年7月6日Z tianya $
* @package DedeCMS.Libraries
* @copyright Copyright (c) 2007 - 2010, DesDev, Inc.
* @modify author admin@zbphp.com
* @license http://help.dedecms.com/usersguide/license.html
* @link http://www.dedecms.com
*/
@set_time_limit(0);
class DedeHttpDown
{
var $m_url = '';
var $m_urlpath = '';
var $m_scheme = 'http';
var $m_host = '';
var $m_port = '80';
var $m_user = '';
var $m_pass = '';
var $m_path = '/';
var $m_query = '';
var $m_fp = '';
var $m_error = '';
var $m_httphead = '';
var $m_html = '';
var $dataLimit = 0;
var $m_puthead = '';
var $BaseUrlPath = '';
var $HomeUrl = '';
var $reTry = 0;
var $JumpCount = 0;
/**
* 初始化系统
*
* @access public
* @param string $url 需要下载的地址
* @return string
*/
function PrivateInit($url)
{
if($url=='') {
return ;
}
$urls = '';
$urls = @parse_url($url);
$this->m_url = $url;
if(is_array($urls))
{
$this->m_host = $urls["host"];
if(!emptyempty($urls["scheme"]))
{
$this->m_scheme = $urls["scheme"];
}
if(!emptyempty($urls["user"]))
{
$this->m_user = $urls["user"];
}
if(!emptyempty($urls["pass"]))
{
$this->m_pass = $urls["pass"];
}
if(!emptyempty($urls["port"]))
{
$this->m_port = $urls["port"];
}
if(!emptyempty($urls["path"]))
{
$this->m_path = $urls["path"];
}
$this->m_urlpath = $this->m_path;
if(!emptyempty($urls["query"]))
{
$this->m_query = $urls["query"];
$this->m_urlpath .= "?".$this->m_query;
}
$this->HomeUrl = $urls["host"];
$this->BaseUrlPath = $this->HomeUrl.$urls["path"];
$this->BaseUrlPath = preg_replace("/\/([^\/]*)\.(.*)$/","/",$this->BaseUrlPath);
$this->BaseUrlPath = preg_replace("/\/$/","",$this->BaseUrlPath);
}
}
/**
* 重设各参数
*
* @access public
* @return void
*/
function ResetAny()
{
$this->m_url = "";
$this->m_urlpath = "";
$this->m_scheme = "http";
$this->m_host = "";
$this->m_port = "80";
$this->m_user = "";
$this->m_pass = "";
$this->m_path = "/";
$this->m_query = "";
$this->m_error = "";
}
/**
* 打开指定网址
*
* @access public
* @param string $url 地址
* @param string $requestType 请求类型
* @return string
*/
function OpenUrl($url,$requestType="GET")
{
$this->ResetAny();
$this->JumpCount = 0;
$this->m_httphead = Array() ;
$this->m_html = '';
$this->dataLimit = 0;
$this->reTry = 0;
$this->Close();
//初始化系统
$this->PrivateInit($url);
$this->PrivateStartSession($requestType);
}
/**
* 转到303重定向网址
*
* @access public
* @param string $url 地址
* @return string
*/
function JumpOpenUrl($url)
{
$this->ResetAny();
$this->JumpCount++;
$this->m_httphead = Array() ;
$this->m_html = "";
$this->Close();
//初始化系统
$this->PrivateInit($url);
$this->PrivateStartSession('GET');
}
/**
* 获得某操作错误的原因
*
* @access public
* @return void
*/
function printError()
{
echo "错误信息：".$this->m_error;
echo "
具体返回头：
";
foreach($this->m_httphead as $k=>$v){ echo "$k => $v
\r\n"; }
}
/**
* 判别用Get方法发送的头的应答结果是否正确
*
* @access public
* @return bool
*/
function IsGetOK()
{
if( preg_match("/^2/",$this->GetHead("http-state")) )
{
return TRUE;
}
else
{
$this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."
";
return FALSE;
}
}
/**
* 看看返回的网页是否是text类型
*
* @access public
* @return bool
*/
function IsText()
{
if( preg_match("/^(2|401)/",$this->GetHead("http-state")) && preg_match("/text|xml|json/i",$this->GetHead("content-type")) )
{
return TRUE;
} else {
$this->m_error .= "内容为非文本类型或网址重定向
";
return FALSE;
}
}
/**
* 判断返回的网页是否是特定的类型
*
* @access public
* @param string $ctype 内容类型
* @return string
*/
function IsContentType($ctype)
{
if(preg_match("/^2/",$this->GetHead("http-state"))
&& $this->GetHead("content-type")==strtolower($ctype))
{ return TRUE; }
else
{
$this->m_error .= "类型不对 ".$this->GetHead("content-type")."
";
return FALSE;
}
}
/**
* 用Http协议下载文件
*
* @access public
* @param string $savefilename 保存文件名称
* @return string
*/
function SaveToBin($savefilename)
{
if(!$this->IsGetOK())
{
return FALSE;
}
if(@feof($this->m_fp))
{
$this->m_error = "连接已经关闭！"; return FALSE;
}
$fp = fopen($savefilename,"w");
while(!feof($this->m_fp))
{
fwrite($fp, fread($this->m_fp, 1024));
}
fclose($this->m_fp);
fclose($fp);
return TRUE;
}
/**
* 保存网页内容为Text文件
*
* @access public
* @param string $savefilename 保存文件名称
* @return string
*/
function SaveToText($savefilename)
{
if($this->IsText())
{
$this->SaveBinFile($savefilename);
}
else
{
return "";
}
}
/**
* 用Http协议获得一个网页的内容
*
* @access public
* @return string
*/
function GetHtml()
{
$tm1 = microtime(true);
if(!$this->IsText())
{
return '';
}
if($this->m_html!='')
{
return $this->m_html;
}
if(!$this->m_fp||@feof($this->m_fp))
{
return '';
}
while(!feof($this->m_fp))
{
$this->m_html .= fgets($this->m_fp,256);
if($this->dataLimit > 0 && strlen($this->m_html) > $this->dataLimit) break;
}
@fclose($this->m_fp);
$tm2 = microtime(true);
$log = "\ntm2-tm1 = ".($tm2-$tm1);
$log.= "\n".$this->m_html;
$this->log_write('GetHtml',$log);
return $this->m_html;
}
/**
* 开始HTTP会话
*
* @access public
* @param string $requestType 请求类型
* @return string
*/
function PrivateStartSession($requestType="GET")
{
if(!$this->PrivateOpenHost())
{
$this->m_error .= "打开远程主机出错!";
return FALSE;
}
$this->reTry++;
if($this->GetHead("http-edition")=="HTTP/1.1")
{
$httpv = "HTTP/1.1";
}
else
{
$httpv = "HTTP/1.0";
}
$ps = explode('?',$this->m_urlpath);
$headString = '';
//发送固定的起始请求头GET、Host信息
if($requestType=="GET")
{
$headString .= "GET ".$this->m_urlpath." $httpv\r\n";
}
else
{
$headString .= "POST ".$ps[0]." $httpv\r\n";
}
if($this->m_user || $this->m_pass)
{
$headString .= "Authorization: Basic ".base64_encode($this->m_user.":".$this->m_pass)."\r\n";
}
$this->m_puthead["Host"] = $this->m_host;
//发送用户自定义的请求头
if(!isset($this->m_puthead["User-Agent"]))
{
$this->m_puthead["User-Agent"] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2)";
}
if(!isset($this->m_puthead["Refer"]))
{
$this->m_puthead["Refer"] = "http://".$this->m_puthead["Host"];
}
/* add on 2012-12-19 */
$headString.="Connection:keep-alive\r\n";
$headString.="Accept-Language:zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3\r\n";
$headString.="Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n";
foreach($this->m_puthead as $k=>$v)
{
$k = trim($k);
$v = trim($v);
if($k!=""&&$v!="")
{
$headString .= "$k: $v\r\n";
}
}
fputs($this->m_fp, $headString);
if($requestType=="POST")
{
$postdata = "";
if(count($ps)>1)
{
for($i=1;$i { $postdata .= $ps[$i]; } } else { $postdata = "OK"; } $plen = strlen($postdata); fputs($this->m_fp,"Content-Type: application/x-www-form-urlencoded\r\n"); fputs($this->m_fp,"Content-Length: $plen\r\n"); } //发送固定的结束请求头 //HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束 if($httpv=="HTTP/1.1") { fputs($this->m_fp,"Connection: Close\r\n\r\n"); } else { fputs($this->m_fp,"\r\n"); } if($requestType=="POST") { fputs($this->m_fp,$postdata); } //获取应答头状态信息 $httpstas = explode(" ",fgets($this->m_fp,256)); $this->m_httphead["http-edition"] = trim($httpstas[0]); $this->m_httphead["http-state"] = trim($httpstas[1]); $this->m_httphead["http-describe"] = ""; for($i=2;$i { $this->m_httphead["http-describe"] .= " ".trim($httpstas[$i]); } //获取详细应答头 while(!feof($this->m_fp)) { $line = trim(fgets($this->m_fp,256)); if($line == "") { break; } $hkey = ""; $hvalue = ""; $v = 0; for($i=0;$i { if($v==1) { $hvalue .= $line[$i]; } if($line[$i]==":") { $v = 1; } if($v==0) { $hkey .= $line[$i]; } } $hkey = trim($hkey); if($hkey!="") { $this->m_httphead[strtolower($hkey)] = trim($hvalue); } } //如果连接被不正常关闭，重试 if(feof($this->m_fp)) { if($this->reTry > 10) { return FALSE; } $this->PrivateStartSession($requestType); } //判断是否是3xx开头的应答 if(preg_match("/^3/",$this->m_httphead["http-state"])) { if($this->JumpCount > 3) { return; } if(isset($this->m_httphead["location"])) { $newurl = $this->m_httphead["location"]; if(preg_match("/^http/i",$newurl)) { $this->JumpOpenUrl($newurl); } else { $newurl = $this->FillUrl($newurl); $this->JumpOpenUrl($newurl); } } else { $this->m_error = "无法识别的答复！"; } } } /** * 获得一个Http头的值 * * @access public * @param string $headname 头文件名称 * @return string */ function GetHead($headname) { $headname = strtolower($headname); return isset($this->m_httphead[$headname]) ? $this->m_httphead[$headname] : ''; } /** * 设置Http头的值 * * @access public * @param string $skey 键 * @param string $svalue 值 * @return string */ function SetHead($skey,$svalue) { $this->m_puthead[$skey] = $svalue; } /** * 打开连接 * * @access public * @return bool */ function PrivateOpenHost() { if($this->m_host=="") { return FALSE; } if(function_exists('checkdnsrr') && !checkdnsrr($this->m_host,'A') && !checkdnsrr($this->m_host,'CNAME')) { $this->m_error = '远程主机'.$this->m_host.'不存在!checkdnsrr !'; return FALSE; } $errno = ""; $errstr = ""; $this->m_fp = @fsockopen($this->m_host, $this->m_port, $errno, $errstr,10); if(!$this->m_fp) { $this->m_error = $errstr; return FALSE; } else { return TRUE; } } /** * 关闭连接 * * @access public * @return void */ function Close() { @fclose($this->m_fp); } /** * 补全相对网址 * * @access public * @param string $surl 需要不全的地址 * @return string */ function FillUrl($surl) { $i = 0; $dstr = ""; $pstr = ""; $okurl = ""; $pathStep = 0; $surl = trim($surl); if($surl=="") { return ""; } $pos = strpos($surl,"#"); if($pos>0) { $surl = substr($surl,0,$pos); } if($surl[0]=="/") { $okurl = "http://".$this->HomeUrl.$surl; } else if($surl[0]==".") { if(strlen($surl)
{ return ""; } else if($surl[1]=="/") { $okurl = "http://".$this->BaseUrlPath."/".substr($surl,2,strlen($surl)-2); } else { $urls = explode("/",$surl); foreach($urls as $u) { if($u=="..") { $pathStep++; } else if($i { $dstr .= $urls[$i]."/"; } else { $dstr .= $urls[$i]; } $i++; } $urls = explode("/",$this->BaseUrlPath); if(count($urls)
{ return ""; } else { $pstr = "http://"; for($i=0;$i { $pstr .= $urls[$i]."/"; } $okurl = $pstr.$dstr; } } } else { if(strlen($surl)
{ $okurl = "http://".$this->BaseUrlPath."/".$surl; } else if(strtolower(substr($surl,0,7))=="http://") { $okurl = $surl; } else { $okurl = "http://".$this->BaseUrlPath."/".$surl; } } $okurl = preg_replace("/^(http:\/\/)/i","",$okurl); $okurl = preg_replace("/\/{1,}/", "/", $okurl); return "http://".$okurl; } function log_write($funcname,$message) { if(!(defined('DEBUG_LEVEL') && DEBUG_LEVEL == TRUE)) return ; $log = "\n".date("Y-M-d H:i:s ").get_current_user()."[".getmypid()."]"; $log.= "\n".$this->m_url."\n".str_repeat('------', 10)."\n".$message; $path = $funcname.' '.date('Y m d H i s ').preg_replace('/([\W]+|\s+)/i', ' ', $this->m_url); if(strlen($path) > 250) $path = substr($path,0,250); $dir = DEDEDATA.'/httpdownlog'; if(!is_dir($dir) && !mkdir($dir)) exit('Can not make dir '.$dir); $path = $dir.'/'.$path; if(!file_exists($path)) touch($path); $fp = fopen($path,'a+'); flock($fp, LOCK_EX); fputs($fp, "PATH:".$path."\nREAL:".realpath($path)."\nMSSG:".$log); fclose($fp); return TRUE; } }//End Class 使用方法： [php] $dhd = new DeDeHttpDown(); $dhd->OpenUrl($Rs['wurl']); $dhd->dataLimit = 5120; $dhd->m_puthead["Refer"] = $Rs['wurl']; $filecnt = trim($dhd->GetHtml()); 存在未解决的问题： （1）假如域名是绑定了A记录和CNAME，有ip指向，但是IP地址是不存在的或者虚假的，程序仍旧会继续获取。 （2）PHP的fsockopen 里面的time out貌似根本就没有起作用。设置了10s超时，但是根本就是执行到程序time out 为止。 如果好的方法建议，可以随时联系我本人。admin@zbphp.com
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