[Nitro] Nitro 0.30 patch - sendfile()

[Jon A. Lambert]

This is a patch to Nitro 0.30 to simplify file downloading.  I've tested it 
in IE 6.0 and FireFox 1.5.

Content-Description and Content-Disposition have been deprecated and it 
seems most browsers don't use them, so you have to have the filename in your 
URL in order to get the browser to use your name.

Attachment included.  I put it in lib/nitro/cgi/sendfile.rb

--cut--
require 'nitro/render'

module Nitro

module Render

  # Send a file download to the client.
  #
  # Like render and redirect, the action is exited upon calling
  #
  # [+fname+]  That name of the file
  # [+path+]   Specifying true mean fname contains the full path.
  #     The default, false, uses Server.public_root as the path.
  #
  # [+return+] true on success, false on failure
  #
  # === Examples
  #
  # require 'nitro/cgi/sendfile'
  # class MyController < Nitro:Controller
  #   def download(fname)
  #     sendfile(fname)
  #   end
  # end
  #
  # class MyController < Nitro:Controller
  #   def download()
  #     sendfile('/etc/password', true)
  #   end
  # end
  def sendfile(fname=nil, fullpath=false)
    fname = fullpath ? fname : "#{Server.public_root}/#{fname}"
    f = File.open(fname, "rb")
    @context.response_headers["Cache-control"] = 'private'
    @context.response_headers["Content-Length"] = "#{File.size?(f) || 0}"
    @context.response_headers["Content-Type"] = 'application/force-download'
    @context.out = f
    raise RenderExit
  end

end

end
--cut--

--
J. Lambert 
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