Base ready

ops/cookbooks/vendor/nodejs/libraries/nodejs_helper.rb

@@ -0,0 +1,40 @@
+module NodeJs
+  module Helper
+    def npm_dist
+      if node['nodejs']['npm']['url']
+        { 'url' => node['nodejs']['npm']['url'] }
+      else
+
+        require 'open-uri'
+        require 'json'
+        result = JSON.parse(URI.parse("https://registry.npmjs.org/npm/#{node['nodejs']['npm']['version']}").read, max_nesting: false)
+        ret = { 'url' => result['dist']['tarball'], 'version' => result['_npmVersion'], 'shasum' => result['dist']['shasum'] }
+        Chef::Log.debug("Npm dist #{ret}")
+        ret
+      end
+    end
+
+    def npm_list(package, path = nil, environment = {})
+      require 'json'
+      cmd = if path
+              Mixlib::ShellOut.new("npm list #{package} -json", cwd: path, environment: environment)
+            else
+              Mixlib::ShellOut.new("npm list #{package} -global -json", environment: environment)
+            end
+
+      JSON.parse(cmd.run_command.stdout, max_nesting: false)
+    end
+
+    def version_valid?(list, package, version)
+      (version ? list[package]['version'] == version : true)
+    end
+
+    def npm_package_installed?(package, version = nil, path = nil, npm_token = nil)
+      environment = { 'NPM_TOKEN' => npm_token } if npm_token
+
+      list = npm_list(package, path, environment)['dependencies']
+      # Return true if package installed and installed to good version
+      !list.nil? && list.key?(package) && version_valid?(list, package, version)
+    end
+  end
+end