Class: Rack::AssetCompiler

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/asset_compiler.rb

Direct Known Subclasses

CoffeeCompiler, SassCompiler

Constant Summary collapse

F = 
::File

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}, &block) ⇒ AssetCompiler

Returns a new instance of AssetCompiler.



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# File 'lib/rack/asset_compiler.rb', line 7

def initialize(app, options={}, &block)
  @app = app

  options = {
    :compiler => block,
    :source_dir => Dir.pwd,
    :url => '/',
    :cache => ENV['RACK_ENV'] == 'production'
  }.merge(options)

  %w(source_extension content_type).each do |field|
    raise "Missing required option :#{field}" unless options.has_key?(field.to_sym)
  end

  @compiler = options[:compiler]
  @source_dir = options[:source_dir]
  @url = options[:url]
  @source_extension = options[:source_extension]
  @content_type = options[:content_type]

  @cache_ttl = options[:cache]

  # Default cache duration is 1 week
  if(@cache_ttl && !@cache_ttl.kind_of?(Integer))
    @cache_ttl = 60 * 60 * 24 * 7
  end
end

Instance Attribute Details

#source_dir ⇒ Object

Returns the value of attribute source_dir.



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# File 'lib/rack/asset_compiler.rb', line 3

def source_dir
  @source_dir
end

#source_extension ⇒ Object

Returns the value of attribute source_extension.



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# File 'lib/rack/asset_compiler.rb', line 3

def source_extension
  @source_extension
end

#url ⇒ Object

Returns the value of attribute url.



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# File 'lib/rack/asset_compiler.rb', line 3

def url
  @url
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/asset_compiler.rb', line 50

def call(env)
  request_path = Utils.unescape(env["PATH_INFO"])
  return response( 403, 'Forbidden') if request_path.include? ".."

  match_parts = url.split('/').select{ |str| str.length > 0 }
  request_parts = request_path.split('/').select{ |str| str.length > 0 }

  if(request_parts.take(match_parts.length) == match_parts)
    request_base = request_parts[match_parts.length..-1]

    # Swap in the source file extension
    request_base[-1].sub!(/\.\w+$/, '.' + source_extension)

    source_file = F.join(source_dir, request_base)

    if F.exists?(source_file)
      last_modified_time = F.mtime(source_file)

      if env['HTTP_IF_MODIFIED_SINCE']
        cached_time = Time.parse(env['HTTP_IF_MODIFIED_SINCE'])
        if last_modified_time <= cached_time
          return [304, {}, ["Not modified\r\n"]]
        end
      end

      body = compile(source_file)

      headers = {
        'Content-Type' => @content_type,
        'Content-Length' => body.length.to_s,
        'Last-Modified' => last_modified_time.httpdate
      }

      if @cache_ttl
        headers['Expires'] = (Time.now + @cache_ttl).strftime('%a, %d %b %Y %H:%M:%S GMT')
        headers['Cache-Control'] = "public,max-age=#{@cache_ttl}"
      end

      return [200, headers, [body]]
    end
  end

  @app.call(env)
end

#compile(source_file) ⇒ Object 



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# File 'lib/rack/asset_compiler.rb', line 42

def compile(source_file)
  if @compiler
    @compiler.call(source_file)
  else
    raise "Missing compiler"
  end
end

#response(status, body) ⇒ Object 



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# File 'lib/rack/asset_compiler.rb', line 35

def response(status, body)
  body += "\r\n"
  [status, {"Content-Type" => 'text/plain',
       "Content-Length" => body.size.to_s},
       [body]]
end