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require "action_controller"
require "active_storage/blob"
require "active_storage/verified_key_with_expiration"
require "active_support/core_ext/object/inclusion"
# This controller is a wrapper around local file downloading. It allows you to
# make abstraction of the URL generation logic and to serve files with expiry
# if you are using the +Disk+ service.
#
# By default, mounting the Active Storage engine inside your application will
# define a +/rails/blobs/:encoded_key/*filename+ route that will reference this
# controller's +show+ action and will be used to serve local files.
#
# A URL for an attachment can be generated through its +#url+ method, that
# will use the aforementioned route.
class ActiveStorage::DiskController < ActionController::Base
def show
if key = decode_verified_key
blob = ActiveStorage::Blob.find_by!(key: key)
if stale?(etag: blob.checksum)
send_data blob.download, filename: blob.filename, type: blob.content_type, disposition: disposition_param
end
else
head :not_found
end
end
private
def decode_verified_key
ActiveStorage::VerifiedKeyWithExpiration.decode(params[:encoded_key])
end
def disposition_param
params[:disposition].presence_in(%w( inline attachment )) || 'inline'
end
end
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