Ruby on Rails - Paperclip Error

Question

For reference I have been following this tutorial: https://devcenter.heroku.com/articles/paperclip-s3 Except I am in localhost testing right now, so I installed the Figaro gem and placed my S3 info in application.yml.

Using Rails v4, Cocaine v0.5.3, and Paperclip v4.1.0 (unsure if any other gem version numbers need to be mentioned).

I have a model called SubmissionDetails, where in its new.html.erb I am trying to upload a jpg to a column called attachment. Here is the relevant model code:

has_attached_file :attachment, styles: {
thumb: '200x200>',
large: '800x800>'
}

validates_attachment_content_type :attachment, content_type: /\Aimage\/.*\Z/

When I try to upload a jpg, it returns back to the form with the following error message:

1 error prohibited this submission_detail from being saved:
Attachment translation missing:
en.activerecord.errors.models.submission_detail.attributes.attachment.spoofed_media_type

I understand some of the error, that text to display this error message is missing from my en.yml file, but what about that spoofed media type part?

This shows up in my server console, not sure if this is relevant:

[paperclip] Content Type Spoof: Filename header.jpg (["image/jpeg"]), content type discovered from file command: . See documentation to allow this combination.
(0.0ms)  rollback transaction

Answer 1

That message is raised by a validation check for content spoofing.

For Paperclip v.4 this generates a bug https://github.com/thoughtbot/paperclip/issues/1429

While for Paperclip v.3, it seems it just throws a deprecation warning, https://github.com/thoughtbot/paperclip/issues/1423

So I'd wait for Paperclip team to solve this bug before using version 4. At the moment I'd rather keep using version 3.

gem "paperclip", "~> 3.5.3"

Or add this to an initializer to disable spoofing protection:

config/initializers/paperclip_media_type_spoof_detector_override.rb

require 'paperclip/media_type_spoof_detector'
module Paperclip
  class MediaTypeSpoofDetector
    def spoofed?
      false
    end
  end
end

see Can't upload image using Paperclip 4.0 Rails 3

Answer 2

As explained recently in the comments of the issue (https://github.com/thoughtbot/paperclip/issues/1429#issuecomment-49821032), adding :

Paperclip.options[:command_path] = '/usr/bin'

to config/initializers/paperclip.rb solved the problem.

Answer 3

On the same issue, I found another workaround that can be applied at model level, without edit any initializer:

class PaperclipModel < ActiveRecord::Base
  has_attached_file :attachment, { validate_media_type: false }

  validates_attachment :attachment, {
    # tweak as desired
    content_type: { content_type: ["text/csv", "text/plain", Paperclip::ContentTypeDetector::SENSIBLE_DEFAULT] }
  }
end

Basically, this skip media_type and content_type validations to avoid spoofed error on PaperclipModel attachment. For more details see here.