这篇文章主要介绍了摘自织梦CMS的HTTP文件下载类,涉及php发送http请求、响应、传输等常用操作技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了摘自织梦CMS的HTTP文件下载类。分享给大家供大家参考。具体如下:
- <?php if(!defined('DEDEINC')) exit("Request Error!");
- /**
- * 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.
- * @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 $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->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 "<br/>具体返回头:<br/>";
- foreach($this->m_httphead as $k=>$v){ echo "$k => $v <br/>/r/n"; }
- }
- /**
- * 判别用Get方法发送的头的应答结果是否正确
- *
- * @access public
- * @return bool
- */
- function IsGetOK()
- {
- if( preg_match("/^2/",$this->GetHead("http-state")) )
- {
- return TRUE;
- }
- else
- {
- $this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."<br/>";
- 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/",$this->GetHead("http-state")) && preg_match("/text|xml/i",$this->GetHead("content-type")) )
- {
- return TRUE;
- }
- else
- {
- $this->m_error .= "内容为非文本类型或网址重定向<br/>";
- 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")."<br/>";
- 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()
- {
- 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);
- }
- @fclose($this->m_fp);
- 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";
- }
- $this->m_puthead["Host"] = $this->m_host;
- //发送用户自定义的请求头
- if(!isset($this->m_puthead["Accept"]))
- {
- $this->m_puthead["Accept"] = "*/*";
- }
- if(!isset($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"];
- }
- 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<count($ps);$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;$i<count($httpstas);$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;$i<strlen($line);$i++)
- {
- if($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;
- }
- $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($surl)<=1)
- {
- return "";
- }
- else if($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<count($urls)-1)
- {
- $dstr .= $urls[$i]."/";
- }
- else
- {
- $dstr .= $urls[$i];
- }
- $i++;
- }
- $urls = explode("/",$this->BaseUrlPath);
- if(count($urls) <= $pathStep)
- {
- return "";
- }
- else
- {
- $pstr = "http://";
- for($i=0;$i<count($urls)-$pathStep;$i++)
- {
- $pstr .= $urls[$i]."/";
- }
- $okurl = $pstr.$dstr;
- }
- }
- }
- else
- {
- if(strlen($surl)<7)
- {
- $okurl = "http://".$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;
- }
- }//End Class
希望本文所述对大家的php程序设计有所帮助。
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