Add endorsement to actor serializer

app/controllers/endorsement_accounts_controller.rb

@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+class EndorsementAccountsController < ApplicationController
+  include AccountControllerConcern
+
+  def index
+    respond_to do |format|
+      format.html do
+        next if @account.user_hides_network?
+
+        endorsed
+        @relationships = AccountRelationshipsPresenter.new(endorsed.map(&:target_account_id), current_user.account_id) if user_signed_in?
+      end
+
+      format.json do
+        raise Mastodon::NotPermittedError if params[:page].present? && @account.user_hides_network?
+
+        render json: collection_presenter,
+               serializer: ActivityPub::CollectionSerializer,
+               adapter: ActivityPub::Adapter,
+               content_type: 'application/activity+json'
+      end
+    end
+  end
+
+  private
+
+  def endorsed
+    @endorsed ||= AccountPin.where(account: @account).page(params[:page]).per(FOLLOW_PER_PAGE).preload(:target_account)
+  end
+
+  def page_url(page)
+    account_endorsed_index_path(@account, page: page) unless page.nil?
+  end
+
+  def collection_presenter
+    if params[:page].present?
+      ActivityPub::CollectionPresenter.new(
+        id: account_endorsed_index_path(@account, page: params.fetch(:page, 1)),
+        type: :ordered,
+        size: endorsed.count,
+        items: endorsed.map { |f| ActivityPub::TagManager.instance.uri_for(f.target_account) },
+        part_of: account_endorsed_index_path(@account),
+        next: page_url(endorsed.next_page),
+        prev: page_url(endorsed.prev_page)
+      )
+    else
+      ActivityPub::CollectionPresenter.new(
+        id: account_endorsed_index_path(@account),
+        type: :ordered,
+        size: endorsed.count,
+        first: page_url(1)
+      )
+    end
+  end
+end

app/serializers/activitypub/actor_serializer.rb

@@ -8,7 +8,7 @@ class ActivityPub::ActorSerializer < ActivityPub::Serializer
   context_extensions :manually_approves_followers, :featured, :also_known_as,
                      :moved_to, :property_value, :hashtag, :emoji, :identity_proof
 
-  attributes :id, :type, :following, :followers,
+  attributes :id, :type, :following, :followers, :endorsed,
              :inbox, :outbox, :featured,
              :preferred_username, :name, :summary,
              :url, :manually_approves_followers
@@ -54,6 +54,10 @@ def followers
     account_followers_url(object)
   end
 
+  def endorsed
+    account_endorsed_index_url(object)
+  end
+
   def inbox
     account_inbox_url(object)
   end

app/views/endorsement_accounts/index.html.haml

@@ -0,0 +1,18 @@
+- content_for :page_title do
+  = t('accounts.people_followed_by', name: display_name(@account))
+
+- content_for :header_tags do
+  %meta{ name: 'robots', content: 'noindex' }/
+  = render 'accounts/og', account: @account, url: account_followers_url(@account, only_path: false)
+
+= render 'accounts/header', account: @account
+
+- if @account.user_hides_network?
+  .nothing-here= t('accounts.network_hidden')
+- elsif @endorsed.empty?
+  = nothing_here
+- else
+  .card-grid
+    = render partial: 'application/card', collection: @endorsed.map(&:target_account), as: :account
+
+  = paginate @endorsed

config/routes.rb

@@ -64,6 +64,7 @@
 
     resources :followers, only: [:index], controller: :follower_accounts
     resources :following, only: [:index], controller: :following_accounts
+    resources :endorsed, only: [:index], controller: :endorsement_accounts
     resource :follow, only: [:create], controller: :account_follow
     resource :unfollow, only: [:create], controller: :account_unfollow