使用presigned_post的Rails下载AWS S3文件-致命异常 [英] Rails download of AWS S3 file using presigned_post - fatal exception

问题描述

我将Rails应用程序设置为使用本教程，效果很好.现在，我正在使用

I set up my Rails app to upload files directly to AWS S3 using this tutorial and it works great. Now I'm working on the direct download piece using the same approach in this SO post. When I try and trigger the download it hangs and then finally returns the following error:

致命于/user/doc_uploads/download 重新输入异常

fatal at /user/doc_uploads/download exception reentered

下面的代码中的puts显示了服务器上似乎是无限循环的情况.我只是对该代码应该如何工作才能弄清楚这一点还不了解.请帮忙！

The puts in the code below show what appears to be an infinite loop on the server. I simply don't know enough about how this code is supposed to work to figure this out. Please help!

doc_uploads_controller.rb

doc_uploads_controller.rb

def get
    @doc_download = @user.doc_uploads.find_by_id(params[:id])
    if @doc_download
      key = @doc_download.file_url.split('amazonaws.com/')[1]
      puts key
      puts S3_BUCKET_NAME
      bucketlink = S3_BUCKET_NAME.object(key).presigned_url(‌​:get, expires_in: 3600)
      puts bucketlink
      redirect_to bucketlink
    else
      flash[:error]="Something went wrong."
      redirect_to user_dashboard_path
    end
  end

aws.rb:

Aws.config.update({
  region: 'us-east-1',
  credentials: Aws::Credentials.new(ENV['AWS_ACCESS_KEY_ID'], ENV['AWS_SECRET_ACCESS_KEY']),
})

S3_BUCKET_NAME = Aws::S3::Resource.new.bucket(ENV['S3_BUCKET_NAME'])

routes.rb:

routes.rb:

get 'user/doc_uploads/download', to: 'doc_uploads#get'

视图:

<% @doc_uploads.each do |doc_upload| %>
...
      <%= link_to user_doc_uploads_download_path(id: doc_upload.id), target: '_blank' do %>
        <p class="glyphicon glyphicon-download-alt"></p>
      <% end %>
...
<% end %>

提前谢谢！

推荐答案

找到了最近的帖子

Found a recent post here and got their solution working, as:

presigner = Aws::S3::Presigner.new
url = presigner.presigned_url(:get_object, bucket: ENV['S3_BUCKET_NAME'], key: key, expires_in: 3600, response_content_disposition: "attachment").to_s
redirect_to url

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