ahoward/g.rb

## g.rb
class WebpackController < ApplicationController
  include ReverseProxy::Controller

# https://stackoverflow.com/questions/10883211/deadly-cors-when-http-localhost-is-the-origin
#
  layout false

  HEADERS =
    {
      #
    }

  def index
    options = reverse_proxy_options.dup

    path = params[:path]

    if request.query_string.present?
      path += "?#{ request.query_string }"
    end

    options[:path] = path

    url = Webpack.server.uri.to_s
    url += '/' unless url.ends_with?('/')

    reverse_proxy(url, options) do |config|

      config.on_complete do |code, response|
        content_type = response['Content-Type']

        proxied_url = URI.parse(File.join(url, options[:path])).to_s

        if code.to_i >= 400
          send_data error_script_for(proxied_url, response), content_type: 'text/javascript', disposition: 'inline' #, status: code
        end
      end
    end
  end

  def error_script_for(url, response)
    html = error_html_for(url, response)
    script = <<-__
      document.write(#{ html.to_json });
    __
    script.html_safe
  end

  def error_html_for(url, response)
    err      = response.body.to_s
    fullpath = request.fullpath
    headers  = response.instance_variable_get('@header')

    <<-__
      <html>
        <body style='padding:1em;'>
          <h2>
            WEBPACK @ <a href="#{ url }">#{ esc(url) }</a>
          </h2>
          <hr>
          <br>
          <dl>
            <dt>
              URL
            </dt>
            <dd style='padding:1em;'>
              <a href="#{ url }">#{ esc(fullpath) }</a>
            </dd>

            <dt>
              HEADERS
            </dt>
            <dd style='padding:1em;'>
              <code style='white-space:pre;'>
              #{ esc(headers.to_yaml) }
              </code>
            </dd>

            <dt>
              RESPONSE
            </dt>
            <dd style='padding:1em;'>
              #{ esc(err) }
            </dd>
          </dl>
        </body>
      </html>
    __
  end

  def esc(html)
    CGI::escapeHTML(html.to_s)
  end


protected
  if Rails.stage.try(:production?)
    def debugging(*args, &block)
      block.call
    end
  else
    def debugging(*args, &block)
      url, options, trace = nil
      url = args.shift
      options = args.shift
      trace = Net::HTTP.debugging{ block.call }
    ensure
      begin
        message = []

        #message << "WEBPACK: url=#{ url.inspect }, options=#{ options.inspect }, trace=#{ trace.first(128) }..."
        message << "WEBPACK: url=#{ url.inspect }, options=#{ options.inspect }"

        trace.to_s.each_line do |line|
          #message << "  NG: #{ line.strip }"
        end

        Rails.logger.info(message)
      rescue
        nil
      end
    end
  end

  def webpack_server_url
    if Webpack.server
      server.uri
    end
  end

  def reverse_proxy_options
    {}.tap do |options|
      options[:verify_ssl] = false
      options[:headers] = HEADERS
    end
  end

  def render(options = {}, &block)
    if options[:body]
      options[:text] = options.delete(:body) # Rails' 3 HACK : ref: https://github.com/rails/rails/issues/12374
    end
    super(options, &block)
  end
end
	class WebpackController < ApplicationController
	include ReverseProxy::Controller

	# https://stackoverflow.com/questions/10883211/deadly-cors-when-http-localhost-is-the-origin
	#
	layout false

	HEADERS =
	{
	#
	}

	def index
	options = reverse_proxy_options.dup

	path = params[:path]

	if request.query_string.present?
	path += "?#{ request.query_string }"
	end

	options[:path] = path

	url = Webpack.server.uri.to_s
	url += '/' unless url.ends_with?('/')

	reverse_proxy(url, options) do \|config\|

	config.on_complete do \|code, response\|
	content_type = response['Content-Type']

	proxied_url = URI.parse(File.join(url, options[:path])).to_s

	if code.to_i >= 400
	send_data error_script_for(proxied_url, response), content_type: 'text/javascript', disposition: 'inline' #, status: code
	end
	end
	end
	end

	def error_script_for(url, response)
	html = error_html_for(url, response)
	script = <<-__
	document.write(#{ html.to_json });
	__
	script.html_safe
	end

	def error_html_for(url, response)
	err = response.body.to_s
	fullpath = request.fullpath
	headers = response.instance_variable_get('@header')

	<<-__
	<html>
	<body style='padding:1em;'>
	<h2>
	WEBPACK @ <a href="#{ url }">#{ esc(url) }</a>
	</h2>
	<hr>
	<br>
	<dl>
	<dt>
	URL
	</dt>
	<dd style='padding:1em;'>
	<a href="#{ url }">#{ esc(fullpath) }</a>
	</dd>

	<dt>
	HEADERS
	</dt>
	<dd style='padding:1em;'>
	<code style='white-space:pre;'>
	#{ esc(headers.to_yaml) }
	</code>
	</dd>

	<dt>
	RESPONSE
	</dt>
	<dd style='padding:1em;'>
	#{ esc(err) }
	</dd>
	</dl>
	</body>
	</html>
	__
	end

	def esc(html)
	CGI::escapeHTML(html.to_s)
	end


	protected
	if Rails.stage.try(:production?)
	def debugging(*args, &block)
	block.call
	end
	else
	def debugging(*args, &block)
	url, options, trace = nil
	url = args.shift
	options = args.shift
	trace = Net::HTTP.debugging{ block.call }
	ensure
	begin
	message = []

	#message << "WEBPACK: url=#{ url.inspect }, options=#{ options.inspect }, trace=#{ trace.first(128) }..."
	message << "WEBPACK: url=#{ url.inspect }, options=#{ options.inspect }"

	trace.to_s.each_line do \|line\|
	#message << " NG: #{ line.strip }"
	end

	Rails.logger.info(message)
	rescue
	nil
	end
	end
	end

	def webpack_server_url
	if Webpack.server
	server.uri
	end
	end

	def reverse_proxy_options
	{}.tap do \|options\|
	options[:verify_ssl] = false
	options[:headers] = HEADERS
	end
	end

	def render(options = {}, &block)
	if options[:body]
	options[:text] = options.delete(:body) # Rails' 3 HACK : ref: https://github.com/rails/rails/issues/12374
	end
	super(options, &block)
	end
	end