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# frozen_string_literal: true
#
# Copyright, 2019, 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 'client'
require_relative 'endpoint'
require_relative 'body/pipe'
module Async
module HTTP
# Wraps a client, address and headers required to initiate a connectio to a remote host using the CONNECT verb.
# Behaves like a TCP endpoint for the purposes of connecting to a remote host.
class Proxy
class ConnectFailure < StandardError
def initialize(response)
super "Failed to connect: #{response.status}"
@response = response
end
attr :response
end
module Client
def proxy(endpoint, headers = nil)
Proxy.new(self, endpoint.authority(false), headers)
end
# Create a client that will proxy requests through the current client.
def proxied_client(endpoint, headers = nil)
proxy = self.proxy(endpoint, headers)
return self.class.new(proxy.wrap_endpoint(endpoint))
end
def proxied_endpoint(endpoint, headers = nil)
proxy = self.proxy(endpoint, headers)
return proxy.wrap_endpoint(endpoint)
end
end
# Prepare and endpoint which can establish a TCP connection to the remote system.
# @param client [Async::HTTP::Client] the client which will be used as a proxy server.
# @param host [String] the hostname or address to connect to.
# @param port [String] the port number to connect to.
# @param headers [Array] an optional list of headers to use when establishing the connection.
# @see Async::IO::Endpoint#tcp
def self.tcp(client, host, port, headers = nil)
self.new(client, "#{host}:#{port}", headers)
end
# Construct a endpoint that will use the given client as a proxy for HTTP requests.
# @param client [Async::HTTP::Client] the client which will be used as a proxy server.
# @param endpoint [Async::HTTP::Endpoint] the endpoint to connect to.
# @param headers [Array] an optional list of headers to use when establishing the connection.
def self.endpoint(client, endpoint, headers = nil)
proxy = self.new(client, endpoint.authority(false), headers)
return proxy.endpoint(endpoint.url)
end
# @param client [Async::HTTP::Client] the client which will be used as a proxy server.
# @param address [String] the address to connect to.
# @param headers [Array] an optional list of headers to use when establishing the connection.
def initialize(client, address, headers = nil)
@client = client
@address = address
@headers = ::Protocol::HTTP::Headers[headers].freeze
end
attr :client
# Close the underlying client connection.
def close
@client.close
end
# Establish a TCP connection to the specified host.
# @return [Socket] a connected bi-directional socket.
def connect(&block)
input = Body::Writable.new
response = @client.connect(@address.to_s, @headers, input)
if response.success?
pipe = Body::Pipe.new(response.body, input)
return pipe.to_io unless block_given?
begin
yield pipe.to_io
ensure
pipe.close
end
else
# This ensures we don't leave a response dangling:
response.close
raise ConnectFailure, response
end
end
# @return [Async::HTTP::Endpoint] an endpoint that connects via the specified proxy.
def wrap_endpoint(endpoint)
Endpoint.new(endpoint.url, self, **endpoint.options)
end
end
Client.prepend(Proxy::Client)
end
end
|
