socketry/falcon

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lib/falcon/endpoint.rb

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# frozen_string_literal: true

# Copyright, 2018, 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 'async/http/endpoint'
require 'localhost/authority'

module Falcon
    # An HTTP-specific endpoint which adds localhost TLS.
    class Endpoint < Async::HTTP::Endpoint
        # The SSL context to use, which invokes {build_ssl_context} if not otherwise specified.
        # @returns [OpenSSL::SSL::SSLContext]
        def ssl_context
            @options[:ssl_context] || build_ssl_context
        end
        
        # Build an appropriate SSL context for the given hostname.
        #
        # Uses {Localhost::Authority} to generate self-signed certficates.
        #
        # @returns [OpenSSL::SSL::SSLContext]
        def build_ssl_context(hostname = self.hostname)
            authority = Localhost::Authority.fetch(hostname)
            
            authority.server_context.tap do |context|
                context.alpn_select_cb = lambda do |protocols|
                    if protocols.include? "h2"
                        return "h2"
                    elsif protocols.include? "http/1.1"
                        return "http/1.1"
                    elsif protocols.include? "http/1.0"
                        return "http/1.0"
                    else
                        return nil
                    end
                end
                
                context.session_id_context = "falcon"
            end
        end
    end
end