Replace OEmbed and initial state Rabl templates with serializers (#4110)

* Replace OEmbed Rabl template with serializer

* Replace initial state rabl with serializer

8 files changed, 114 insertions, 60 deletions

diff --git a/app/controllers/api/oembed_controller.rb b/app/controllers/api/oembed_controller.rb
index 6e3e34d96..f8c87dd16 100644
--- a/app/controllers/api/oembed_controller.rb
+++ b/app/controllers/api/oembed_controller.rb
@@ -5,8 +5,7 @@ class Api::OEmbedController < Api::BaseController
 
   def show
     @stream_entry = find_stream_entry.stream_entry
-    @width = maxwidth_or_default
-    @height = maxheight_or_default
+    render json: @stream_entry, serializer: OEmbedSerializer, width: maxwidth_or_default, height: maxheight_or_default
   end
 
   private
diff --git a/app/controllers/home_controller.rb b/app/controllers/home_controller.rb
index 6209a3ae9..218da6906 100644
--- a/app/controllers/home_controller.rb
+++ b/app/controllers/home_controller.rb
@@ -2,13 +2,10 @@
 
 class HomeController < ApplicationController
   before_action :authenticate_user!
+  before_action :set_initial_state_json
 
   def index
-    @body_classes           = 'app-body'
-    @token                  = current_session.token
-    @web_settings           = Web::Setting.find_by(user: current_user)&.data || {}
-    @admin                  = Account.find_local(Setting.site_contact_username)
-    @streaming_api_base_url = Rails.configuration.x.streaming_api_base_url
+    @body_classes = 'app-body'
   end
 
   private
@@ -16,4 +13,14 @@ class HomeController < ApplicationController
   def authenticate_user!
     redirect_to(single_user_mode? ? account_path(Account.first) : about_path) unless user_signed_in?
   end
+
+  def set_initial_state_json
+    state = InitialStatePresenter.new(settings: Web::Setting.find_by(user: current_user)&.data || {},
+                                      current_account: current_account,
+                                      token: current_session.token,
+                                      admin: Account.find_local(Setting.site_contact_username))
+
+    serializable_resource = ActiveModelSerializers::SerializableResource.new(state, serializer: InitialStateSerializer)
+    @initial_state_json   = serializable_resource.to_json
+  end
 end
diff --git a/app/presenters/initial_state_presenter.rb b/app/presenters/initial_state_presenter.rb
new file mode 100644
index 000000000..75fef28a8
--- /dev/null
+++ b/app/presenters/initial_state_presenter.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class InitialStatePresenter < ActiveModelSerializers::Model
+  attributes :settings, :token, :current_account, :admin
+end
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
new file mode 100644
index 000000000..84f9e23a6
--- /dev/null
+++ b/app/serializers/initial_state_serializer.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class InitialStateSerializer < ActiveModel::Serializer
+  attributes :meta, :compose, :accounts,
+             :media_attachments, :settings
+
+  def meta
+    {
+      streaming_api_base_url: Rails.configuration.x.streaming_api_base_url,
+      access_token: object.token,
+      locale: I18n.locale,
+      domain: Rails.configuration.x.local_domain,
+      me: object.current_account.id,
+      admin: object.admin&.id,
+      boost_modal: object.current_account.user.setting_boost_modal,
+      delete_modal: object.current_account.user.setting_delete_modal,
+      auto_play_gif: object.current_account.user.setting_auto_play_gif,
+      system_font_ui: object.current_account.user.setting_system_font_ui,
+    }
+  end
+
+  def compose
+    {
+      me: object.current_account.id,
+      default_privacy: object.current_account.user.setting_default_privacy,
+    }
+  end
+
+  def accounts
+    store = {}
+    store[object.current_account.id] = ActiveModelSerializers::SerializableResource.new(object.current_account, serializer: REST::AccountSerializer)
+    store[object.admin.id]           = ActiveModelSerializers::SerializableResource.new(object.admin, serializer: REST::AccountSerializer) unless object.admin.nil?
+    store
+  end
+
+  def media_attachments
+    { accept_content_types: MediaAttachment::IMAGE_MIME_TYPES + MediaAttachment::VIDEO_MIME_TYPES }
+  end
+end
diff --git a/app/serializers/oembed_serializer.rb b/app/serializers/oembed_serializer.rb
new file mode 100644
index 000000000..78376d253
--- /dev/null
+++ b/app/serializers/oembed_serializer.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+class OEmbedSerializer < ActiveModel::Serializer
+  include RoutingHelper
+  include ActionView::Helpers::TagHelper
+
+  attributes :type, :version, :title, :author_name,
+             :author_url, :provider_name, :provider_url,
+             :cache_age, :html, :width, :height
+
+  def type
+    'rich'
+  end
+
+  def version
+    '1.0'
+  end
+
+  def author_name
+    object.account.display_name.presence || object.account.username
+  end
+
+  def author_url
+    account_url(object.account)
+  end
+
+  def provider_name
+    Rails.configuration.x.local_domain
+  end
+
+  def provider_url
+    root_url
+  end
+
+  def cache_age
+    86_400
+  end
+
+  def html
+    tag :iframe,
+        src: embed_account_stream_entry_url(object.account, object),
+        style: 'width: 100%; overflow: hidden',
+        frameborder: '0',
+        scrolling: 'no',
+        width: width,
+        height: height
+  end
+
+  def width
+    instance_options[:width]
+  end
+
+  def height
+    instance_options[:height]
+  end
+end
diff --git a/app/views/api/oembed/show.json.rabl b/app/views/api/oembed/show.json.rabl
deleted file mode 100644
index 11dcec538..000000000
--- a/app/views/api/oembed/show.json.rabl
+++ /dev/null
@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-object @stream_entry
-
-node(:type) { 'rich' }
-node(:version) { '1.0' }
-node(:title, &:title)
-node(:author_name) { |entry| entry.account.display_name.blank? ? entry.account.username : entry.account.display_name }
-node(:author_url) { |entry| account_url(entry.account) }
-node(:provider_name) { site_hostname }
-node(:provider_url) { root_url }
-node(:cache_age) { 86_400 }
-node(:html) { |entry| "<iframe src=\"#{embed_account_stream_entry_url(entry.account, entry)}\" style=\"width: 100%; overflow: hidden\" frameborder=\"0\" width=\"#{@width}\" height=\"#{@height}\" scrolling=\"no\"></iframe>" }
-node(:width) { @width }
-node(:height) { @height }
diff --git a/app/views/home/index.html.haml b/app/views/home/index.html.haml
index 33c978c89..71dcb54c6 100644
--- a/app/views/home/index.html.haml
+++ b/app/views/home/index.html.haml
@@ -1,5 +1,5 @@
 - content_for :header_tags do
-  %script#initial-state{ type: 'application/json' }!= json_escape(render(file: 'home/initial_state', formats: :json))
+  %script#initial-state{ type: 'application/json' }!= json_escape(@initial_state_json)
 
   = javascript_pack_tag 'application', integrity: true, crossorigin: 'anonymous'
 
diff --git a/app/views/home/initial_state.json.rabl b/app/views/home/initial_state.json.rabl
deleted file mode 100644
index c428a5a1f..000000000
--- a/app/views/home/initial_state.json.rabl
+++ /dev/null
@@ -1,38 +0,0 @@
-object false
-
-node(:meta) do
-  {
-    streaming_api_base_url: @streaming_api_base_url,
-    access_token: @token,
-    locale: I18n.locale,
-    domain: site_hostname,
-    me: current_account.id,
-    admin: @admin.try(:id),
-    boost_modal: current_account.user.setting_boost_modal,
-    delete_modal: current_account.user.setting_delete_modal,
-    auto_play_gif: current_account.user.setting_auto_play_gif,
-    system_font_ui: current_account.user.setting_system_font_ui,
-  }
-end
-
-node(:compose) do
-  {
-    me: current_account.id,
-    default_privacy: current_account.user.setting_default_privacy,
-  }
-end
-
-node(:accounts) do
-  store = {}
-  store[current_account.id] = ActiveModelSerializers::SerializableResource.new(current_account, serializer: REST::AccountSerializer)
-  store[@admin.id] = ActiveModelSerializers::SerializableResource.new(@admin, serializer: REST::AccountSerializer) unless @admin.nil?
-  store
-end
-
-node(:media_attachments) do
-  {
-    accept_content_types: MediaAttachment::IMAGE_MIME_TYPES + MediaAttachment::VIDEO_MIME_TYPES
-  }
-end
-
-node(:settings) { @web_settings }