Module: Roda::RodaPlugins::Assets::InstanceMethods

Defined in:

lib/roda/plugins/assets.rb

Instance Method Summary

• #assets(type, attrs = OPTS) ⇒ Object

  Return a string containing html tags for the given asset type.

• #assets_paths(type) ⇒ Object

  Return an array of paths for the given asset type and optionally asset group.

• #read_asset_file(file, type) ⇒ Object

  Return the content of the file if it is already of the correct type.

• #render_asset(file, type) ⇒ Object

  Render the asset with the given filename.

Instance Method Details

#assets(type, attrs = OPTS) ⇒ Object

Return a string containing html tags for the given asset type. This will use a script tag for the :js type and a link tag for the :css type.

To return the tags for a specific asset group, use an array for the type, such as [:css, :frontend].

You can specify custom attributes for the tag by passing a hash as the attrs argument.

When the assets are not compiled, this will result in a separate tag for each asset file. When the assets are compiled, this will result in a single tag to the compiled asset file.

# File 'lib/roda/plugins/assets.rb', line 761

def assets(type, attrs = OPTS)
  ltype = type.is_a?(Array) ? type[0] : type

  o = self.class.assets_opts
  if o[:compiled] && (algo = o[:sri]) && (hash = _compiled_assets_hash(type))
    attrs = Hash[attrs]
    attrs[:integrity] = "#{algo}-#{h([[hash].pack('H*')].pack('m').tr("\n", ''))}"
  end

  attributes = attrs.map{|k,v| "#{k}=\"#{h(v)}\""}.join(' ')

  if ltype == :js
    tag_start = "<script#{' type="text/javascript"' unless attrs[:type]} #{attributes} src=\""
    tag_end = "\"></script>"
  else
    tag_start = "<link rel=\"stylesheet\" #{attributes} href=\""
    tag_end = "\" />"
  end

  paths = assets_paths(type)
  if o[:early_hints]
    early_hint_as = ltype == :js ? 'script' : 'style'
    early_hints = paths.map{|p| "<#{p}>; rel=preload; as=#{early_hint_as}"}
    early_hints = early_hints.join("\n") if Rack.release < '3'
    send_early_hints(RodaResponseHeaders::LINK=>early_hints)
  end
  paths.map{|p| "#{tag_start}#{h(p)}#{tag_end}"}.join("\n")
end

#assets_paths(type) ⇒ Object

Return an array of paths for the given asset type and optionally asset group. See the assets function documentation for details.

# File 'lib/roda/plugins/assets.rb', line 705

def assets_paths(type)
  o = self.class.assets_opts
  if type.is_a?(Array)
    ltype, *dirs = type
  else
    ltype = type
  end
  stype = ltype.to_s

  url_prefix = request.script_name if self.class.opts[:add_script_name]
  relative_paths = o[:relative_paths]

  paths = if o[:compiled]
    relative_paths = false if o[:compiled_asset_host]
    if ukey = _compiled_assets_hash(type, true)
      ["#{o[:compiled_asset_host]}#{url_prefix}/#{o[:"compiled_#{stype}_prefix"]}.#{ukey}.#{stype}"]
    else
      []
    end
  else
    asset_dir = o[ltype]
    if dirs && !dirs.empty?
      dirs.each{|f| asset_dir = asset_dir[f]}
      prefix = "#{dirs.join('/')}/" if o[:group_subdirs]
    end
    Array(asset_dir).map do |f|
      if ts = o[:timestamp_paths]
        mtime = asset_last_modified(File.join(o[:"#{stype}_path"], *[prefix, f].compact))
        mtime = "#{sprintf("%i%06i", mtime.to_i, mtime.usec)}#{ts}"
      end
      "#{url_prefix}/#{o[:"#{stype}_prefix"]}#{mtime}#{prefix}#{f}#{o[:"#{stype}_suffix"]}"
    end
  end

  if relative_paths
    paths.map! do |path|
      "#{relative_prefix}#{path}"
    end
  end

  paths
end

#read_asset_file(file, type) ⇒ Object

Return the content of the file if it is already of the correct type. Otherwise, render the file using the render plugin. file should be the relative path to the file from the current directory.

# File 'lib/roda/plugins/assets.rb', line 819

def read_asset_file(file, type)
  o = self.class.assets_opts

  content = if file.end_with?(".#{type}")
    ::File.read(file)
  else
    render_asset_file(file, :template_opts=>o[:"#{type}_opts"], :dependencies=>o[:expanded_dependencies][file])
  end

  o[:postprocessor] ? o[:postprocessor].call(file, type, content) : content
end

#render_asset(file, type) ⇒ Object

Render the asset with the given filename. When assets are compiled, or when the file is already of the given type (no rendering necessary), this returns the contents of the compiled file. When assets are not compiled and the file is not already in the same format, this will render the asset using the render plugin. In both cases, if the file has not been modified since the last request, this will return a 304 response.

# File 'lib/roda/plugins/assets.rb', line 797

def render_asset(file, type)
  o = self.class.assets_opts
  if o[:compiled]
    file = "#{o[:"compiled_#{type}_path"]}#{file}"

    if o[:gzip] && env['HTTP_ACCEPT_ENCODING'] =~ /\bgzip\b/
      @_response[RodaResponseHeaders::CONTENT_ENCODING] = 'gzip'
      file += '.gz'
    end

    check_asset_request(file, type, ::File.stat(file).mtime)
    ::File.read(file)
  else
    file = "#{o[:"#{type}_path"]}#{file}"
    check_asset_request(file, type, asset_last_modified(file))
    read_asset_file(file, type)
  end
end