Downloads the gem files for the given gem, along with all of it's dependencies

download_gems.rb

require 'net/http'
require 'json'
require 'fileutils'

HTTP_PROXY = URI 'http://proxy:80'
DOWNLOAD_DIRECTORY = 'gems'

def http_connection(host, port, use_ssl, &block)
	proxy_connection = Net::HTTP::Proxy(HTTP_PROXY.host, HTTP_PROXY.port)

	#Net::HTTP.start(host, port) do |http|
	proxy_connection.start(host, port,
                           :verify_mode => OpenSSL::SSL::VERIFY_NONE,
                           :use_ssl => use_ssl) do |http|
		block.call(http)
	end
end

def download_file(source_url)
	download_uri = URI source_url
	filepath = File.join(DOWNLOAD_DIRECTORY, File.basename(download_uri.path))

	if File.exists? filepath
		puts "File #{filepath} already exists"
	else
		puts "Downloading #{source_url} to #{filepath}"

		FileUtils.mkdir_p File.dirname File.expand_path(filepath)

		http_connection download_uri.host, download_uri.port, download_uri.scheme=='https' do |http|
			response = http.get(download_uri.path)
			open(filepath, "wb") do |file|
				file.write(response.body)
			end
		end
	end
end

def download_gem(gem_name)
	uri = URI "https://rubygems.org/api/v1/gems/#{gem_name}.json"

	http_connection uri.host, uri.port, uri.scheme=='https' do |http|
		request = Net::HTTP::Get.new uri.path
		response = http.request(request)

		json = JSON.parse response.body

		puts json['gem_uri']

		gem_uri = URI json['gem_uri']

		download_file gem_uri.to_s

		dependencies = json['dependencies']['runtime']

		dependencies.each do |dependency|
			puts "Downloading dependency: #{dependency['name']}"
			download_gem dependency['name']
		end
	end
end

download_gem ARGV[0]