transparent proxy

gistfile1.ru

require 'rubygems'
require 'em-proxy'
require 'ruby-debug'
require 'cgi'

puts "starting"
puts "\n\n\n\n"
Proxy.start(:host => "192.168.1.113", :port => 3000) do |conn|
  conn.server :srv, :host => "mail.yahooapis.com", :port => 80
 
  conn.on_data do |data|
    puts "original"
    print data
    puts "\n\n\n\n\n"

    data.gsub!(/192\.168\.1\.113:3000/, "mail.yahooapis.com")
    data.gsub!(/Via.*\n/,'')
    data.gsub!(/X-Forwarded-For.*\n/,'')
    data.gsub!(/X-Forwarded-Host.*\n/,'')
    data.gsub!(/X-Forwarded-Server.*\n/,'')
    data.gsub!(/Cookie.*\n/,'')
    data.gsub!(/Content-type.*/,"Content-Type: application/json")
    headers, body = *data.split(/\r\n\r\n/)
    if body
      body_parts = body.split(/&/).map{|p|
        CGI.unescape(p)
      }
      oauth_parts = body_parts.select{|p| p.match(/^oauth/)}.map{|h| 
        parts = h.split(/\=/)
        k = parts[0]
        v = parts[1, parts.size].join("=")
        if h.match(/oauth_signature=/)
          v+="="
        end
        "#{k}=\"#{CGI.escape(v)}\""
      }
      api_call    = body_parts.select{|p| p.match(/zen_api_call/)}.first.split(/\=/).last
    
      oauth_parts.reject!{|p|p.match(/oauth_signature_method/)}
      oauth_parts.unshift("oauth_signature_method=\"HMAC-SHA1\"")
      headers += "\r\nAuthorization: OAuth #{oauth_parts.join(", ")}"
      headers += "\r\nAccept: application/json"
    
      new_content_length = api_call.length
      headers.gsub!(/Content-Length.*/,"Content-Length: #{new_content_length}")
    
      data = "#{headers}\r\n\r\n#{api_call}\r\n"
    
      # data.gsub!(/Referer.*\n/,'')
      # data.gsub!(/Connection: Keep-Alive/,'Keep-Alive: 115')
      puts "request"
      print data
      puts "\n\n\n\n"
    end
    data 
  end
 
  # modify / process response stream
  conn.on_response do |backend, resp|
    print resp
    resp.gsub!(/"\*\.yahoo.com"/, '"*"          ')
    puts "\n\n\n\n"
    resp
  end

end