git-download-urls.rb

#!/usr/bin/ruby
require 'net/http'
require 'json'

class GetGitRelease
   # Set the Gut API URL
   @@git_api_url = "https://api.github.com"

   # Initialize the object
   def initialize(owner, repo, vtag, osarch)
      @owner = owner
      @repo = repo
      @vtag = vtag
      @osarch = osarch
   end

   # Get the download URL
   def download_urls()
      if(@vtag == "latest")
         uri = URI("#{@@git_api_url}/repos/#{@owner}/#{@repo}/releases/latest")
      else
         uri = URI("#{@@git_api_url}/repos/#{@owner}/#{@repo}/releases/tags/#{@vtag}")
      end
      response = Net::HTTP.get(uri)
      release = JSON.parse(response)

      release['assets'].each do |assets|
         if (assets['browser_download_url'].include? @osarch)
             puts assets['browser_download_url']
         end
      end
   end
end

# Create Objects
om = GetGitRelease.new("pivotal-cf", "om", "latest", "linux")
jq = GetGitRelease.new("stedolan", "jq", "latest", "linux")

# Call Methods
om.download_urls()
jq.download_urls()