rails 媒体文件流通过 send_data 或 send_file 方法接受字节范围请求 [英] rails media file stream accept byte range request through send_data or send_file method

问题描述

我有以下问题.声音从公共文件夹中隐藏，因为只有某些用户应该有权访问声音文件.所以我做了一个方法，它的作用就像一个声音的url，但首先计算当前用户是否被允许访问这个文件.

I have the following problem. Sounds are hidden from the public folder, cause there are only certain Users who should have access to the sound files. So I made a certain method, which acts like a sound url, but calculates first, whether the current user is allowed to access this file.

文件由 send_data 方法发送.问题只是，即使它可以正常工作，我的工作也会很慢......我用来播放声音的 jplayer 插件的开发人员告诉我，我应该能够接受字节范围请求以使其正常工作...

The file gets sent by the send_data method. The problem is just, that I it works quite slow if it works even... The developer of the jplayer plugin, which I use to play the sound, told me that I should be able to accept byte range requests to make it work properly...

如何在 Rails 控制器中通过 send_data 或 send_file 发送文件来做到这一点?

How can I do this within a rails controller by sending the file with send_data or send_file?

谢谢，马库斯

推荐答案

我已经能够使用 send_file 成功地提供文件.虽然我遇到了一个问题，但寻找歌曲的较早部分会导致一个新的请求，这使得歌曲从 0:00 重新开始，而不是从搜索栏的真实位置重新开始.到目前为止，这是我为我工作的:

I've been able to serve up the files with some success using send_file. Although I have one hitch, seeking to an earlier part of the song causes a new request which makes the song restart from 0:00 instead of the true location from the seekbar. This is what I have working for me so far:

  file_begin = 0
  file_size = @media.file_file_size 
  file_end = file_size - 1

  if !request.headers["Range"]
    status_code = "200 OK"
  else
    status_code = "206 Partial Content"
    match = request.headers['range'].match(/bytes=(d+)-(d*)/)
    if match
      file_begin = match[1]
      file_end = match[1] if match[2] && !match[2].empty?
    end
    response.header["Content-Range"] = "bytes " + file_begin.to_s + "-" + file_end.to_s + "/" + file_size.to_s
  end
  response.header["Content-Length"] = (file_end.to_i - file_begin.to_i + 1).to_s
  response.header["Last-Modified"] = @media.file_updated_at.to_s

  response.header["Cache-Control"] = "public, must-revalidate, max-age=0"
  response.header["Pragma"] = "no-cache"
  response.header["Accept-Ranges"]=  "bytes"
  response.header["Content-Transfer-Encoding"] = "binary"
  send_file(DataAccess.getUserMusicDirectory(current_user.public_token) + @media.sub_path, 
            :filename => @media.file_file_name,
            :type => @media.file_content_type, 
            :disposition => "inline",
            :status => status_code,
            :stream =>  'true',
            :buffer_size  =>  4096)

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