通过Paperclip 4连接时，在S3中设置内容类型？

I'm trying to attach CSV files to a Rails3 model using paperclip 4.1.1, but I'm having trouble getting the content-type as reported by S3 to be text/csv (instead I am getting text/plain). When I subsequently download the file from S3, the extension is getting changed to match the content-type instead of preserving the original extension (so test.csv is downloaded as test.txt).

我正在尝试使用paperclip 4.1.1将CSV文件附加到Rails3模型，但是我无法将S3报告的内容类型变为text / csv（而是我得到text / plain）。当我随后从S3下载文件时，扩展名将更改为与内容类型匹配，而不是保留原始扩展名（因此test.csv将作为test.txt下载）。

From what I can see, when you upload a file, the FileAdapter will cache the content-type on creation with whatever value was determined by the ContentTypeDetector (which calls file -b --mime filename). Unfortunately, CSV files return text/plain which makes sense, as how can you really distinguish this? Attempts to set the content-type with attachment.instance_write(:content_type, 'text/csv') only set the value in the model and do not affect what gets written to S3.

从我所看到的，当您上传文件时，FileAdapter将使用ContentTypeDetector（调用文件-b --mime文件名）确定的任何值来缓存创建时的内容类型。不幸的是，CSV文件返回text / plain是有意义的，你怎么能真正区分它呢？尝试使用attachment.instance_write（：content_type，'text / csv'）设置内容类型只会在模型中设置值，而不会影响写入S3的内容。

FileAdapter's content_type initialized here: https://github.com/thoughtbot/paperclip/blob/v4.0/lib/paperclip/io_adapters/file_adapter.rb#L14

FileAdapter的content_type在这里初始化：https：//github.com/thoughtbot/paperclip/blob/v4.0/lib/paperclip/io_adapters/file_adapter.rb#L14

Call which creates that io_adapter: https://github.com/thoughtbot/paperclip/blob/v4.0/lib/paperclip/attachment.rb#L98

创建io_adapter的调用：https：//github.com/thoughtbot/paperclip/blob/v4.0/lib/paperclip/attachment.rb#L98

I really have a generic upload here (so I can't hard-code the content type in the S3 headers definition in has_attached_file), and I don't really want the content-type spoofing protection. Any ideas/suggestions? I would prefer not to downgrade to 3.5 because it would mean just delaying the pain, but if that's the only way, I'll entertain it...

我真的有一个通用的上传（所以我不能硬编码has_attached_file中S3头定义中的内容类型），我真的不想要内容类型的欺骗保护。有什么想法/建议吗？我宁愿不降级到3.5，因为这只会拖延痛苦，但如果这是唯一的方法，我会接受它......

1 个解决方案

#1

If you are using fog then you can do something like this:

如果你使用雾，那么你可以这样做：

has_attached_file :report,
  fog_file: lambda { |attachment|
    {
      content_type: 'text/csv',
      content_disposition: "attachment; filename=#{attachment.original_filename}",
    }
  }

If you are using Amazon S3 as your storage provider, then something like this should work:

如果您使用Amazon S3作为存储提供商，那么这样的事情应该有效：

has_attached_file :report
  s3_headers: lambda { |attachment|
    { 
      'Content-Type' => 'text/csv',
      'Content-Disposition' => "attachment; filename=#{attachment.original_filename}",
    }
  }

#1