将服务文件托管在另一个服务器上作为下载 [英] Serving file hosted on another server as download

问题描述

我有一个简单但关键的问题（对我的应用程序至关重要）

我将有一个文件网址：

  http://a.com/b.jpg 
 http://a.com/b.zip 
 http：// a。 com / b.mp3 
<或任何有效的文件> 
  

当用户点击我网站上任何特定文件的下载链接，b.com，用户将看到url为

  http://b.com/?f=1 
  

我不希望用户看到原始URL，其次，想强制下载文件， p>

我知道我可以使用readfile来实现这一点（请参阅 http://php.net/manual/en/function.readfile.php ），但我不知道filesize和mimetype，我怎么能得到保证文件将正确下载？

请帮助别人

解决方案

我想你可以使用cURL触发对目标网址的HEAD请求。这将使托管目标的Web服务器具有文件的mimetype和内容长度。

  $ url ='http：// www.example.com/path/somefile.ext'; 
 $ ch = curl_init（）; 
 curl_setopt（$ ch，CURLOPT_HEADER，true）; 
 curl_setopt（$ ch，CURLOPT_NOBODY，true）; // make it一个HEAD请求
 curl_setopt（$ ch，CURLOPT_FOLLOWLOCATION，true）; 
 curl_setopt（$ ch，CURLOPT_URL，$ url）; 
 curl_setopt（$ ch，CURLOPT_RETURNTRANSFER，TRUE）; 
 $ head = curl_exec（$ ch）; 
 
 $ mimeType = curl_getinfo（$ ch，CURLINFO_CONTENT_TYPE）; 
 $ size = curl_getinfo（$ ch，CURLINFO_CONTENT_LENGTH_DOWNLOAD）; 
 $ path = parse_url（$ url，PHP_URL_PATH）; 
 $ filename = substr（$ path，strrpos（$ path，'/'）+ 1）; 
 
 curl_close（$ ch）;然后，您可以将这些头文件写回到您的脚本上的HTTP请求：
  
  header（'Content-Type：'。$ mimeType）; 
 header（'Content-Disposition：attachment; filename ='。$ filename。'';'）; 
 header（'Content-Length：'。$ size）; 
  
然后你按照文件内容。
  readfile（$ url）; 
  
 
I have a simple, yet critical question (critical for my application)

I will have a file url as:
http://a.com/b.jpg
http://a.com/b.zip
http://a.com/b.mp3
<or any valid file>
When user will click on download link for any specific file (say b.jpg) on my site i.e., b.com, user will see url as
http://b.com/?f=1
I don't want user to see original URL and secondly, want to force download of file, irrespective of filetype

I know that I can achieve this using readfile (Check Example1 at http://php.net/manual/en/function.readfile.php), but I don't know filesize and mimetype, how can I get assurance that file will be downloaded properly?

Please help guys
解决方案
I suppose you can use cURL to fire off a HEAD request for the target URL. This will let the web server hosting the target the mimetype and content length of the file.
$url = 'http://www.example.com/path/somefile.ext';
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_HEADER, true); 
curl_setopt($ch, CURLOPT_NOBODY, true); // make it a HEAD request
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); 
curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); 
$head = curl_exec($ch);

$mimeType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
$size = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
$path = parse_url($url, PHP_URL_PATH);
$filename = substr($path, strrpos($path, '/') + 1);

curl_close($ch); 
Then, you can write back these headers to the HTTP request made on your script:
header('Content-Type: '.$mimeType);
header('Content-Disposition: attachment; filename="'.$filename. '";' );
header('Content-Length: '.$size);
And then you follow this up with the file contents.
readfile($url);


                        
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