# Copyright, 2012, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

module Utopia
	class Content
		# Compatibility with older versions of rack:
		EXPIRES = 'Expires'.freeze
		CACHE_CONTROL = 'Cache-Control'.freeze
		CONTENT_TYPE = 'Content-Type'.freeze
		
		class Response
			def initialize
				@status = 200
				@headers = {}
			end
			
			attr :status
			attr :headers
			
			# Specifies that the content shouldn't be cached. Overrides `cache!` if already called.
			def do_not_cache!
				@headers[CACHE_CONTROL] = "no-cache, must-revalidate"
				@headers[EXPIRES] = Time.now.httpdate
			end

			# Specify that the content should be cached.
			def cache!(duration = 3600, access: "public")
				unless @headers[CACHE_CONTROL] =~ /no-cache/
					@headers[CACHE_CONTROL] = "#{access}, max-age=#{duration}"
					@headers[EXPIRES] = (Time.now + duration).httpdate
				end
			end

			# Specify the content type of the response data.
			def content_type= value
				@headers[CONTENT_TYPE] = value
			end
			
			alias content_type! content_type=
		end
	end
end