检测 Ruby 中上传文件的 MIME 类型 [英] Detect MIME type of uploaded file in Ruby

问题描述

是否有防弹方法来检测 Ruby 或 Ruby on Rails 中上传文件的 MIME 类型?我正在使用 SWFupload 上传 JPEG 和 PNG，并且 content_type 始终是 "application/octet-stream"

Is there a bullet proof way to detect MIME type of uploaded file in Ruby or Ruby on Rails? I'm uploading JPEGs and PNGs using SWFupload and content_type is always "application/octet-stream"

推荐答案

ruby-filemagic gem 可以做到:

require 'filemagic'

puts FileMagic.new(FileMagic::MAGIC_MIME).file(__FILE__)
# => text/x-ruby; charset=us-ascii

这个 gem 根本不看文件扩展名.它读取一些文件内容并使用它来猜测文件的类型.

This gem does not look at the file extension at all. It reads a bit of the file contents and uses that to guess the file's type.

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