Class: Isomorfeus::AssetManager::RackMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/isomorfeus/asset_manager/rack_middleware.rb

Constant Summary collapse

WS_RESPONSE = 
[0, {}, []].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ RackMiddleware

Returns a new instance of RackMiddleware.



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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 9

def initialize(app)
  @app = app
  @asset_manager = Isomorfeus::AssetManager.new
  @compressible_types = %w[application/javascript text/javascript text/css]
  if Isomorfeus.assets_path.end_with?('/')
    @assets_path = Isomorfeus.assets_path
    @assets_path_size = @assets_path.size
  else
    @assets_path = Isomorfeus.assets_path + '/'
    @assets_path_size = @assets_path.size
  end
rescue Exception => e
  STDERR.puts "#{e.message}\n#{e.backtrace&.join("\n")}\n"
end

Instance Attribute Details

#asset_manager ⇒ Object (readonly)

Returns the value of attribute asset_manager.



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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 7

def asset_manager
  @asset_manager
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 24

def call(env)
  path_info = env['PATH_INFO']
  if path_info.start_with?(@assets_path)

    if path_info.end_with?('.js')
      # get js

      asset_key = path_info[@assets_path_size..-1]
      if Isomorfeus.assets.key?(asset_key)
        asset = Isomorfeus.assets[asset_key]
        if asset && asset.target != :node
          asset_manager.transition(asset_key, asset)
          headers = {}
          headers['Last-Modified'] = asset.mtime
          headers[Rack::CONTENT_TYPE] = 'application/javascript'
          if should_gzip?(env)
            headers['Content-Encoding'] = "gzip"
            headers[Rack::CONTENT_LENGTH] = asset.bundle_gz_size
            return [200, headers, asset.bundle_gz]
          else
            headers[Rack::CONTENT_LENGTH] = asset.bundle_size
            return [200, headers, asset.bundle]
          end
        end
      end

    elsif path_info.end_with?('.js.map')
      # get js source map

      asset_key = path_info[@assets_path_size..-5]
      asset = Isomorfeus.assets[asset_key]
      if asset && asset.target != :node
        asset_manager.transition(asset_key, asset) unless asset.bundled?
        headers = {}
        headers['Last-Modified'] = asset.mtime
        headers[Rack::CONTENT_TYPE] = 'application/json'
        if should_gzip?(env)
          headers['Content-Encoding'] = "gzip"
          headers[Rack::CONTENT_LENGTH] = asset.bundle_map_gz_size
          return [200, headers, asset.bundle_map_gz]
        else
          headers[Rack::CONTENT_LENGTH] = asset.bundle_map_size
          return [200, headers, asset.bundle_map]
        end
      end

    elsif path_info.end_with?('.css')
      # get css

      asset_key = path_info[@assets_path_size..-5] + '.js'
      asset = Isomorfeus.assets[asset_key]
      if asset && asset.target != :node
        asset_manager.transition(asset_key, asset)
        headers = {}
        headers['Last-Modified'] = asset.mtime
        headers[Rack::CONTENT_TYPE] = 'text/css'
        if should_gzip?(env)
          headers['Content-Encoding'] = "gzip"
          headers[Rack::CONTENT_LENGTH] = asset.css_gz_size
          return [200, headers, asset.css_gz]
        else
          headers[Rack::CONTENT_LENGTH] = asset.css_size
          return [200, headers, asset.css]
        end
      end

    elsif path_info.end_with?('.css.map')
      # get css source map

      asset_key = path_info[@assets_path_size..-9] + '.js'
      asset = Isomorfeus.assets[asset_key]
      if asset && asset.target != :node
        asset_manager.transition(asset_key, asset) unless asset.bundled?
        headers = {}
        headers['Last-Modified'] = asset.mtime
        headers[Rack::CONTENT_TYPE] = 'application/json'
        if should_gzip?(env)
          headers['Content-Encoding'] = "gzip"
          headers[Rack::CONTENT_LENGTH] = asset.css_map_gz_size
          return [200, headers, asset.css_map_gz]
        else
          headers[Rack::CONTENT_LENGTH] = asset.css_map_size
          return [200, headers, asset.css_map]
        end
      end
    end

    return [404, {}, 'not found']
  # hot reloading subscription

  elsif Isomorfeus.development? && path_info == Isomorfeus.assets_websocket_path
    if env['rack.upgrade?'] == :websocket
      env['rack.upgrade'] = Isomorfeus::AssetManager::ServerSocketProcessor.new
    end
    WS_RESPONSE
  else
    @app.call(env)
  end
rescue Exception => e
  STDERR.puts "#{e.message}\n#{e.backtrace&.join("\n")}\n"
  @app.call(env)
end

#should_gzip?(env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/isomorfeus/asset_manager/rack_middleware.rb', line 122

def should_gzip?(env)
  return true if env.key?('HTTP_ACCEPT_ENCODING') && env['HTTP_ACCEPT_ENCODING'].match?(/\bgzip\b/)
  return false if /\bno-transform\b/.match?(env[Rack::CACHE_CONTROL].to_s) || env['Content-Encoding']&.!~(/\bidentity\b/)
  return false if @compressible_types && !(env.key?(Rack::CONTENT_TYPE) && @compressible_types.include?(env[Rack::CONTENT_TYPE][/[^;]*/]))
  true
end