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A quick HTTP proxy server in Ruby.
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#!/usr/bin/env ruby | |
# A quick and dirty implementation of an HTTP proxy server in Ruby | |
# because I did not want to install anything. | |
# | |
# Copyright (C) 2009-2014 Torsten Becker <torsten.becker@gmail.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 'socket' | |
require 'uri' | |
class Proxy | |
def run port | |
begin | |
# Start our server to handle connections (will raise things on errors) | |
@socket = TCPServer.new port | |
# Handle every request in another thread | |
loop do | |
s = @socket.accept | |
Thread.new s, &method(:handle_request) | |
end | |
# CTRL-C | |
rescue Interrupt | |
puts 'Got Interrupt..' | |
# Ensure that we release the socket on errors | |
ensure | |
if @socket | |
@socket.close | |
puts 'Socked closed..' | |
end | |
puts 'Quitting.' | |
end | |
end | |
def handle_request to_client | |
request_line = to_client.readline | |
verb = request_line[/^\w+/] | |
url = request_line[/^\w+\s+(\S+)/, 1] | |
version = request_line[/HTTP\/(1\.\d)\s*$/, 1] | |
uri = URI::parse url | |
# Show what got requested | |
puts((" %4s "%verb) + url) | |
to_server = TCPSocket.new(uri.host, (uri.port.nil? ? 80 : uri.port)) | |
to_server.write("#{verb} #{uri.path}?#{uri.query} HTTP/#{version}\r\n") | |
content_len = 0 | |
loop do | |
line = to_client.readline | |
if line =~ /^Content-Length:\s+(\d+)\s*$/ | |
content_len = $1.to_i | |
end | |
# Strip proxy headers | |
if line =~ /^proxy/i | |
next | |
elsif line.strip.empty? | |
to_server.write("Connection: close\r\n\r\n") | |
if content_len >= 0 | |
to_server.write(to_client.read(content_len)) | |
end | |
break | |
else | |
to_server.write(line) | |
end | |
end | |
buff = "" | |
loop do | |
to_server.read(4048, buff) | |
to_client.write(buff) | |
break if buff.size < 4048 | |
end | |
# Close the sockets | |
to_client.close | |
to_server.close | |
end | |
end | |
# Get parameters and start the server | |
if ARGV.empty? | |
port = 8008 | |
elsif ARGV.size == 1 | |
port = ARGV[0].to_i | |
else | |
puts 'Usage: proxy.rb [port]' | |
exit 1 | |
end | |
Proxy.new.run port | |
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The loop at line 95 should check for a nil return value from
#read
, otherwise it may not work correctly for chunked responses.https://ruby-doc.org/core-2.7.1/IO.html#method-i-read