Transloadit-Paperclip integration

controller.rb

def decode_transloadit_json
  return unless params[:transloadit].present?

  # wrap transloadit params in a HashWithIndifferentAccess
  params[:transloadit] = ActiveSupport::HashWithIndifferentAccess.new(
    ActiveSupport::JSON.decode params[:transloadit]
  )

  # decode parameters from transloadit
  params[:transloadit][:uploads].first.tap do |history|
    params[:report].update(
      :history_file_name      => history[:name],
      :history_file_size      => history[:size],
      :history_content_type   => history[:mime],
      :history_transloadit_id => history[:id].insert(2, '/'),
      :history_updated_at     => Time.parse(params[:transloadit][:start_date])
    )
  end
end

model.rb

has_attached_file :history, YAML::load_file('config/paperclip.yml')[Rails.env]

paperclip.yml

defaults: &defaults
  :default_url: ''

filesystem: &filesystem
  :storage: :filesystem
  :url    : /system/attachments/:env/:class/:id/:attachment/:filename
  :path   : ':rails_root/public/system/attachments/:env/:class/:id/:attachment/:filename'

s3: &s3
  :storage       : :s3
  :url           : ':s3_domain_url'
  :path          : attachments/:attachment/:transloadit_id/:filename
  :s3_credentials: config/s3.yml
  :s3_permissions: private
  :s3_protocol   : https
  

development:
  <<: *defaults
  <<: *filesystem
  
test:
  <<: *defaults
  <<: *filesystem
  :path: ':tmpdir/:app/attachments/:env/:class/:id/:attachment/:filename'

production:
  <<: *defaults
  <<: *s3

paperclip_initializer.rb

Paperclip.interpolates(:env) do |attachment, style|
  Rails.env
end

Paperclip.interpolates(:tmpdir) do |attachment, style|
  Dir.tmpdir
end

Paperclip.interpolates(:app) do |attachment, style|
  Rails.application.class::NAME
end

Paperclip.interpolates(:transloadit_id) do |attachment, style|
  attachment.instance.send :"#{attachment.name}_transloadit_id"
end