在Rails中渲染PNG文件

Question

我有一个Rails应用程序,我试图显示一个PNG文件,但我收到此错误:

ActionView::Template::Error (Your template was not saved as valid UTF-8. Please either specify UTF-8 as the encoding for your template in your text editor, or mark the template with its encoding by inserting the following as the first line of the template:

# encoding: <name of correct encoding>.

The source of your template was:

?PNG

IHDR#??)    pHYs?]s? IDATx???g@SW?E??7?ZuV??Z?:j?m?m?Z??U[W?:??Z?*?j???@?3? I???p??}
????
???b?X?/???Z?I?N111,?O??x?T??x?mU????vtt

我已经添加:

Mime::Type.register "image/png", :png

到config/initializers/mime_types.rb

我在其控制器中引用并呈现png文件:

render :inline => @object.body.string, :content_type => @object.content_type || "img/png", :layout => false

编辑:

这是控制器中的方法

 def read_data
  resource = Aws::S3::Resource.new(client: @new_client)
  if @files.size == 0 && @links.size == 0 && resource.bucket(@bucket.name).objects.first != nil && !request.original_url.end_with?('/')
  if request.original_url.split('/')[-1] != @bucket.name && resource.bucket(@bucket.name).object(@prefix).exists?
     @object = @new_client.get_object(bucket: @bucket.name, key: @prefix)
     if @prefix.present? && @object.last_modified && (@object.content_type.match(/text/) || @object.content_type.match("application/json") || @prefix.end_with?('.json') || @prefix.end_with?('.html') || @prefix.end_with?('.txt') || @prefix.end_with?('.xml') || (@object.content_length > 0 && @object.content_type == ""))
      render :inline => @object.body.string, :content_type => @object.content_type || "text/plain", :layout => false
     elsif @prefix.end_with?('.png')
         send_data(@object.body, 
                   :type         => @object.content_type || "image/png",
                   :disposition  => 'inline')
     else
      redirect_to resource.bucket(@bucket.name).object(@prefix).presigned_url(:get, expires_in: 8) #presigned url expires after 8 ms
    end
  end
end

结束

Answer 1

使用该send_data方法发送二进制文件:

send_data(@object.body.string, 
          type: @object.content_type || 'image/png', 
          disposition: 'inline')