gistfile1.rb

#!/usr/bin/ruby
#
# GitHub raw file download
# -------------------------------
# Provides a "get_blob" method for downloading the raw contents of a
# file in a GitHub repository. Useful in cases where only the Ruby core
# is available (i.e. for setting up new EC2 instances automatically)
#
# Usage:
# data = get_blob("user", "repository", "/path/to/file")
#
# -------------------------------
# Written by Logan Raarup (http://github.com/logandk)
# Released under the MIT license, 2009

require 'yaml'
require 'pathname'
require 'net/http'
require 'net/https'

# Configuration settings
HOSTNAME = "github.com"
USERNAME = "" # GitHub Username
API_TOKEN = "" # GitHub API Token


def api_request(url)
  $transport ||= Net::HTTP.new(HOSTNAME, URI::HTTPS::DEFAULT_PORT)
  $transport.use_ssl = true
  
  req = Net::HTTP::Post.new(url)
  req.set_form_data({ :login => USERNAME, :token => API_TOKEN }, '&')
  response = $transport.request(req)
  data = YAML::load(response.body)
end

def get_blob(user, repo, path)
  data = api_request("/api/v2/yaml/commits/list/#{user}/#{repo}/master")
  tree_sha = data['commits'].first['tree']
  
  path = Pathname.new(path)
  path.each_filename do |segment|
    if segment == path.basename.to_s
      data = api_request("/api/v2/yaml/blob/show/#{user}/#{repo}/#{tree_sha}/#{segment}")
      return data['blob']['data']
    else
      data = api_request("/api/v2/yaml/tree/show/#{user}/#{repo}/#{tree_sha}")
      tree_sha = data['tree'].select { |tree| tree['name'] == segment }.first['sha']
    end
  end

  return nil
end