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# frozen_string_literal: true
# Serves files stored with the disk service in the same way that the cloud services do.
# This means using expiring, signed URLs that are meant for immediate access, not permanent linking.
# Always go through the BlobsController, or your own authenticated controller, rather than directly
# to the service URL.
class ActiveStorage::DiskController < ActiveStorage::BaseController
skip_forgery_protection
def show
if key = decode_verified_key
serve_file disk_service.path_for(key[:key]), content_type: key[:content_type], disposition: key[:disposition]
else
head :not_found
end
rescue Errno::ENOENT
head :not_found
end
def update
if token = decode_verified_token
if acceptable_content?(token)
disk_service.upload token[:key], request.body, checksum: token[:checksum]
else
head :unprocessable_entity
end
else
head :not_found
end
rescue ActiveStorage::IntegrityError
head :unprocessable_entity
end
private
def disk_service
ActiveStorage::Blob.service
end
def decode_verified_key
ActiveStorage.verifier.verified(params[:encoded_key], purpose: :blob_key)
end
def serve_file(path, content_type:, disposition:)
Rack::File.new(nil).serving(request, path).tap do |(status, headers, body)|
self.status = status
self.response_body = body
headers.each do |name, value|
response.headers[name] = value
end
response.headers["Content-Type"] = content_type || DEFAULT_SEND_FILE_TYPE
response.headers["Content-Disposition"] = disposition || DEFAULT_SEND_FILE_DISPOSITION
end
end
def decode_verified_token
ActiveStorage.verifier.verified(params[:encoded_token], purpose: :blob_token)
end
def acceptable_content?(token)
token[:content_type] == request.content_mime_type && token[:content_length] == request.content_length
end
end
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