diff options
Diffstat (limited to 'actionview/lib/action_view/helpers/asset_tag_helper.rb')
| -rw-r--r-- | actionview/lib/action_view/helpers/asset_tag_helper.rb | 109 |
1 files changed, 103 insertions, 6 deletions
diff --git a/actionview/lib/action_view/helpers/asset_tag_helper.rb b/actionview/lib/action_view/helpers/asset_tag_helper.rb index bc2713d13e..da630129cb 100644 --- a/actionview/lib/action_view/helpers/asset_tag_helper.rb +++ b/actionview/lib/action_view/helpers/asset_tag_helper.rb @@ -2,8 +2,10 @@ require "active_support/core_ext/array/extract_options" require "active_support/core_ext/hash/keys" -require_relative "asset_url_helper" -require_relative "tag_helper" +require "active_support/core_ext/object/inclusion" +require "active_support/core_ext/object/try" +require "action_view/helpers/asset_url_helper" +require "action_view/helpers/tag_helper" module ActionView # = Action View Asset Tag Helpers @@ -37,6 +39,9 @@ module ActionView # When the Asset Pipeline is enabled, you can pass the name of your manifest as # source, and include other JavaScript or CoffeeScript files inside the manifest. # + # If the server supports Early Hints header links for these assets will be + # automatically pushed. + # # ==== Options # # When the last parameter is a hash you can add HTML attributes using that @@ -77,12 +82,20 @@ module ActionView def javascript_include_tag(*sources) options = sources.extract_options!.stringify_keys path_options = options.extract!("protocol", "extname", "host", "skip_pipeline").symbolize_keys - sources.uniq.map { |source| + early_hints_links = [] + + sources_tags = sources.uniq.map { |source| + href = path_to_javascript(source, path_options) + early_hints_links << "<#{href}>; rel=preload; as=script" tag_options = { - "src" => path_to_javascript(source, path_options) + "src" => href }.merge!(options) content_tag("script".freeze, "", tag_options) }.join("\n").html_safe + + request.send_early_hints("Link" => early_hints_links.join("\n")) if respond_to?(:request) && request + + sources_tags end # Returns a stylesheet link tag for the sources specified as arguments. If @@ -92,6 +105,9 @@ module ActionView # to "screen", so you must explicitly set it to "all" for the stylesheet(s) to # apply to all media types. # + # If the server supports Early Hints header links for these assets will be + # automatically pushed. + # # stylesheet_link_tag "style" # # => <link href="/assets/style.css" media="screen" rel="stylesheet" /> # @@ -113,14 +129,22 @@ module ActionView def stylesheet_link_tag(*sources) options = sources.extract_options!.stringify_keys path_options = options.extract!("protocol", "host", "skip_pipeline").symbolize_keys - sources.uniq.map { |source| + early_hints_links = [] + + sources_tags = sources.uniq.map { |source| + href = path_to_stylesheet(source, path_options) + early_hints_links << "<#{href}>; rel=preload; as=stylesheet" tag_options = { "rel" => "stylesheet", "media" => "screen", - "href" => path_to_stylesheet(source, path_options) + "href" => href }.merge!(options) tag(:link, tag_options) }.join("\n").html_safe + + request.send_early_hints("Link" => early_hints_links.join("\n")) if respond_to?(:request) && request + + sources_tags end # Returns a link tag that browsers and feed readers can use to auto-detect @@ -199,6 +223,67 @@ module ActionView }.merge!(options.symbolize_keys)) end + # Returns a link tag that browsers can use to preload the +source+. + # The +source+ can be the path of an resource managed by asset pipeline, + # a full path or an URI. + # + # ==== Options + # + # * <tt>:type</tt> - Override the auto-generated mime type, defaults to the mime type for +source+ extension. + # * <tt>:as</tt> - Override the auto-generated value for as attribute, calculated using +source+ extension and mime type. + # * <tt>:crossorigin</tt> - Specify the crossorigin attribute, required to load cross-origin resources. + # * <tt>:nopush</tt> - Specify if the use of server push is not desired for the resource. Defaults to +false+. + # + # ==== Examples + # + # preload_link_tag("custom_theme.css") + # # => <link rel="preload" href="/assets/custom_theme.css" as="style" type="text/css" /> + # + # preload_link_tag("/videos/video.webm") + # # => <link rel="preload" href="/videos/video.mp4" as="video" type="video/webm" /> + # + # preload_link_tag(post_path(format: :json), as: "fetch") + # # => <link rel="preload" href="/posts.json" as="fetch" type="application/json" /> + # + # preload_link_tag("worker.js", as: "worker") + # # => <link rel="preload" href="/assets/worker.js" as="worker" type="text/javascript" /> + # + # preload_link_tag("//example.com/font.woff2") + # # => <link rel="preload" href="//example.com/font.woff2" as="font" type="font/woff2" crossorigin="anonymous"/> + # + # preload_link_tag("//example.com/font.woff2", crossorigin: "use-credentials") + # # => <link rel="preload" href="//example.com/font.woff2" as="font" type="font/woff2" crossorigin="use-credentials" /> + # + # preload_link_tag("/media/audio.ogg", nopush: true) + # # => <link rel="preload" href="/media/audio.ogg" as="audio" type="audio/ogg" /> + # + def preload_link_tag(source, options = {}) + href = asset_path(source, skip_pipeline: options.delete(:skip_pipeline)) + extname = File.extname(source).downcase.delete(".") + mime_type = options.delete(:type) || Template::Types[extname].try(:to_s) + as_type = options.delete(:as) || resolve_link_as(extname, mime_type) + crossorigin = options.delete(:crossorigin) + crossorigin = "anonymous" if crossorigin == true || (crossorigin.blank? && as_type == "font") + nopush = options.delete(:nopush) || false + + link_tag = tag.link({ + rel: "preload", + href: href, + as: as_type, + type: mime_type, + crossorigin: crossorigin + }.merge!(options.symbolize_keys)) + + early_hints_link = "<#{href}>; rel=preload; as=#{as_type}" + early_hints_link += "; type=#{mime_type}" if mime_type + early_hints_link += "; crossorigin=#{crossorigin}" if crossorigin + early_hints_link += "; nopush" if nopush + + request.send_early_hints("Link" => early_hints_link) if respond_to?(:request) && request + + link_tag + end + # Returns an HTML image tag for the +source+. The +source+ can be a full # path, a file or an Active Storage attachment. # @@ -395,6 +480,18 @@ module ActionView raise ArgumentError, "Cannot pass a :size option with a :height or :width option" end end + + def resolve_link_as(extname, mime_type) + if extname == "js" + "script" + elsif extname == "css" + "style" + elsif extname == "vtt" + "track" + elsif (type = mime_type.to_s.split("/")[0]) && type.in?(%w(audio video font)) + type + end + end end end end |