# Copyright, 2017, 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.

require_relative 'http1'
require_relative 'http2'

require_relative '../pool'

require 'openssl'

unless OpenSSL::SSL::SSLContext.instance_methods.include? :alpn_protocols=
	abort "OpenSSL implementation doesn't support ALPN."
end

module Async
	module HTTP
		module Protocol
			# A server that supports both HTTP1.0 and HTTP1.1 semantics by detecting the version of the request.
			module HTTPS
				HANDLERS = {
					"http/1.0" => HTTP10,
					"http/1.1" => HTTP11,
					"h2" => HTTP2,
					nil => HTTP11,
				}
				
				def self.protocol_for(stream)
					# alpn_protocol is only available if openssl v1.0.2+
					name = stream.io.alpn_protocol
					
					Async.logger.debug(self) {"Negotiating protocol #{name.inspect}..."}
					
					if protocol = HANDLERS[name]
						return protocol
					else
						throw ArgumentError.new("Could not determine protocol for connection (#{name.inspect}).")
					end
				end
				
				def self.client(stream)
					protocol_for(stream).client(stream)
				end
				
				def self.server(stream)
					protocol_for(stream).server(stream)
				end
			end
		end
	end
end