gistfile1.txt

require 'rubygems'
gem     'mime-types'
require 'mime/types'
require 'uri'

module Multipart

  CRLF                = "\r\n"
  RESERVED_CHARACTERS =  /[^a-zA-Z0-9\-\.\_\~]/

  def http_multipart_data(params)
    body = ""
    headers = {}

    boundary = Time.now.to_i.to_s(16)

    headers["Content-Type"] = "multipart/form-data; boundary=#{boundary}"
    params.each do |key,value|
      esc_key = URI::escape(key.to_s, RESERVED_CHARACTERS)
      body << "--#{boundary}#{CRLF}"

      if value.respond_to?(:read)
        mime_type = MIME::Types.type_for(value.path)[0] || MIME::Types["application/octet-stream"][0]
        body << "Content-Disposition: form-data; name=\"#{esc_key}\"; filename=\"#{File.basename(value.path)}\"#{CRLF}"
        body << "Content-Type: #{mime_type.simplified}#{CRLF*2}"
        body << value.read
      else
        body << "Content-Disposition: form-data; name=\"#{esc_key}\"#{CRLF*2}#{value}"
      end
    end

    body << "--#{boundary}--#{CRLF*2}"
    headers["Content-Length"] = body.size.to_s

    return body, headers
  end


end