强制从s3亚马逊服务器下载 [英] Forcing Download from s3 amazon servers

问题描述

我开发了一个新的网络应用程序，它依赖于 Amazon S3 服务器作为存储系统， Codeiginter 作为PHP框架。

I've been developing a new web application which relies on Amazon S3 servers as storage system, and Codeiginter as the PHP framework.

我需要强制该文件在点击链接时下载。原始网址如下所示：

I need to force the file to download when the link is clicked. The original URL looks like this:

http://www.our-web.com/download/do/1.jpg

这将生成一个临时签名的URL到Amazon S3服务器上的实际文件，如下所示：

which generates a temporary signed URL to the actual file on the Amazon S3 servers like this:

http://main_bucket.s3.amazonaws.com/post/1/1.jpg?AWSAccessKeyId=AKIAJEOQKYPKC3CCU5RA&Expires=1305395426&Signature=iuzCdA22gImLK192%2BMAhk8OkAY8%3D

我需要让用户点击链接后立即从真实的Amazon网站开始下载文件。

I need to make the file start downloading from the real Amazon URL it soon as the user clicks the link.

我现在有两种方法：

1. 使用 redirect（）这将打开文件不下载它;

1. Use redirect() which will open the file not download it; or

2. Alter headers as this code:

header('Content-type: application/force-download');
header('Content-Disposition: attachment; filename=' . $file_name);
header('Content-Transfer-Encoding: binary');
header('Expires: 4000');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($generated_file));

readfile($generated_file);

不幸的是， 。第二种方法导致下载来自我的网站，而不是直接来自Amazon。

Unfortunately, both ways don't help me. The second method causes the download to come from my website and not from directly from Amazon.

如何强制文件直接从Amazon S3服务器下载，而不是

How can I force the file to download directly from the Amazon S3 servers, and not from my website?

推荐答案

您只需在S3中为文件设置正确的标题，以强制浏览器下载而不是打开文件。设置以下内容：

You just need to set the correct headers on your files in S3 in order to force the browser to download rather than opening the file. Set these:

Content-Disposition: attachment; filename=FILENAME.EXT
Content-Type: application/octet-stream

在将文件上传到S3时设置它们。使用 php SDK ，您可以使用 create_object 。

You will need to set them when uploading the files to S3. With the php SDK you'd use create_object.

或者您可以在上传后使用 'change_content_type'或通过在S3中将文件复制到自身并设置正确的标题。

Or you can set these after uploading using 'change_content_type' or by copying the file to itself in S3 and setting the correct headers.

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