Rename home#index to react#react

app/controllers/react_controller.rb

@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+class ReactController < ApplicationController
+  before_action :authenticate_user!, only: :react
+  before_action :set_referrer_policy_header, only: :react
+  before_action :set_initial_state_json, only: :react
+  before_action :set_data_for_meta, only: :react
+
+  def react
+    @body_classes = 'app-body'
+  end
+
+  private
+
+  def set_data_for_meta
+    return if find_route_matches
+
+    if params[:username].present?
+      @account = Account.find_local(params[:username])
+    elsif params[:account_username].present?
+      @account = Account.find_local(params[:account_username])
+
+      if params[:id].present? && !@account.nil?
+        @status = @account.statuses.find(params[:id])
+        @stream_entry = @status.stream_entry
+        @type = @stream_entry.activity_type.downcase
+      end
+    end
+
+    if request.path.starts_with?('/tags') && params[:tag].present?
+      @tag = Tag.find_normalized(params[:tag])
+    end
+
+  end
+
+  def authenticate_user!
+    return if user_signed_in?
+
+    # if no current user, dont allow to navigate to these paths
+    if find_route_matches
+      redirect_to(homepage_path)
+    end
+  end
+
+  def find_route_matches
+    request.path.match(/\A\/(home|groups|lists|notifications|explore|follow_requests|blocks|domain_blocks|mutes)/)
+  end
+
+  def set_initial_state_json
+    serializable_resource = ActiveModelSerializers::SerializableResource.new(InitialStatePresenter.new(initial_state_params), serializer: InitialStateSerializer)
+    @initial_state_json   = serializable_resource.to_json
+  end
+
+  def initial_state_params
+    if !current_user.nil?
+      {
+        settings: Web::Setting.find_by(user: current_user)&.data || {},
+        push_subscription: current_account.user.web_push_subscription(current_session),
+        current_account: current_account,
+        token: current_session.token,
+        admin: Account.find_local(Setting.site_contact_username.strip.gsub(/\A@/, '')),
+      }
+    else
+      {
+        admin: Account.find_local(Setting.site_contact_username.strip.gsub(/\A@/, '')),
+      }
+    end
+  end
+
+  def set_referrer_policy_header
+    response.headers['Referrer-Policy'] = 'origin'
+  end
+end