Improve ActivityPub representations (#3844)

* Improve webfinger templates and make tests more flexible

* Clean up AS2 representation of actor

* Refactor outbox

* Create activities representation

* Add representations of followers/following collections, do not redirect /users/:username route if format is empty

* Remove unused translations

* ActivityPub endpoint for single statuses, add ActivityPub::TagManager for better
URL/URI generation

* Add ActivityPub::TagManager#to

* Represent all attachments as Document instead of Image/Video specifically
(Because for remote ones we may not know for sure)

Add mentions and hashtags representation to AP notes

* Add AP-resolvable hashtag URIs

* Use ActiveModelSerializers for ActivityPub

* Clean up unused translations

* Separate route for object and activity

* Adjust cc/to matrices

* Add to/cc to activities, ensure announce activity embeds target status and
not the wrapper status, add "id" to all collections

61 files changed, 443 insertions, 725 deletions

diff --git a/app/controllers/accounts_controller.rb b/app/controllers/accounts_controller.rb
index 69b520df1..a95aabf1d 100644
--- a/app/controllers/accounts_controller.rb
+++ b/app/controllers/accounts_controller.rb
@@ -16,7 +16,9 @@ class AccountsController < ApplicationController
         render xml: AtomSerializer.render(AtomSerializer.new.feed(@account, @entries.to_a))
       end
 
-      format.activitystreams2
+      format.json do
+        render json: @account, serializer: ActivityPub::ActorSerializer, adapter: ActivityPub::Adapter
+      end
     end
   end
 
diff --git a/app/controllers/activitypub/outboxes_controller.rb b/app/controllers/activitypub/outboxes_controller.rb
new file mode 100644
index 000000000..6a58ccf24
--- /dev/null
+++ b/app/controllers/activitypub/outboxes_controller.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class ActivityPub::OutboxesController < Api::BaseController
+  before_action :set_account
+
+  def show
+    @statuses = @account.statuses.permitted_for(@account, current_account).paginate_by_max_id(20, params[:max_id], params[:since_id])
+    @statuses = cache_collection(@statuses, Status)
+
+    render json: outbox_presenter, serializer: ActivityPub::CollectionSerializer, adapter: ActivityPub::Adapter
+  end
+
+  private
+
+  def set_account
+    @account = Account.find_local!(params[:account_username])
+  end
+
+  def outbox_presenter
+    ActivityPub::CollectionPresenter.new(
+      id: account_outbox_url(@account),
+      type: :ordered,
+      current: account_outbox_url(@account),
+      size: @account.statuses_count,
+      items: @statuses
+    )
+  end
+end
diff --git a/app/controllers/api/activitypub/activities_controller.rb b/app/controllers/api/activitypub/activities_controller.rb
deleted file mode 100644
index a880ee92f..000000000
--- a/app/controllers/api/activitypub/activities_controller.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-# frozen_string_literal: true
-
-class Api::ActivityPub::ActivitiesController < Api::BaseController
-  include Authorization
-
-  # before_action :set_follow, only: [:show_follow]
-  before_action :set_status, only: [:show_status]
-
-  respond_to :activitystreams2
-
-  # Show a status in AS2 format, as either an Announce (reblog) or a Create (post) activity.
-  def show_status
-    authorize @status, :show?
-
-    if @status.reblog?
-      render :show_status_announce
-    else
-      render :show_status_create
-    end
-  end
-
-  private
-
-  def set_status
-    @status = Status.find(params[:id])
-  end
-end
diff --git a/app/controllers/api/activitypub/notes_controller.rb b/app/controllers/api/activitypub/notes_controller.rb
deleted file mode 100644
index 96652b879..000000000
--- a/app/controllers/api/activitypub/notes_controller.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-class Api::ActivityPub::NotesController < Api::BaseController
-  include Authorization
-
-  before_action :set_status
-
-  respond_to :activitystreams2
-
-  def show
-    authorize @status, :show?
-  end
-
-  private
-
-  def set_status
-    @status = Status.find(params[:id])
-  end
-end
diff --git a/app/controllers/api/activitypub/outbox_controller.rb b/app/controllers/api/activitypub/outbox_controller.rb
deleted file mode 100644
index 1af04cb54..000000000
--- a/app/controllers/api/activitypub/outbox_controller.rb
+++ /dev/null
@@ -1,69 +0,0 @@
-# frozen_string_literal: true
-
-class Api::ActivityPub::OutboxController < Api::BaseController
-  before_action :set_account
-
-  respond_to :activitystreams2
-
-  def show
-    if params[:max_id] || params[:since_id]
-      show_outbox_page
-    else
-      show_base_outbox
-    end
-  end
-
-  private
-
-  def show_base_outbox
-    @statuses = Status.as_outbox_timeline(@account)
-    @statuses = cache_collection(@statuses)
-
-    set_maps(@statuses)
-
-    set_first_last_page(@statuses)
-
-    render :show
-  end
-
-  def show_outbox_page
-    all_statuses = Status.as_outbox_timeline(@account)
-    @statuses = all_statuses.paginate_by_max_id(limit_param(DEFAULT_STATUSES_LIMIT), params[:max_id], params[:since_id])
-
-    all_statuses = cache_collection(all_statuses)
-    @statuses = cache_collection(@statuses)
-
-    set_maps(@statuses)
-
-    set_first_last_page(all_statuses)
-
-    @next_page_url = api_activitypub_outbox_url(pagination_params(max_id: @statuses.last.id))    unless @statuses.empty?
-    @prev_page_url = api_activitypub_outbox_url(pagination_params(since_id: @statuses.first.id)) unless @statuses.empty?
-
-    @paginated = @next_page_url || @prev_page_url
-    @part_of_url = api_activitypub_outbox_url
-
-    set_pagination_headers(@next_page_url, @prev_page_url)
-
-    render :show_page
-  end
-
-  def cache_collection(raw)
-    super(raw, Status)
-  end
-
-  def set_account
-    @account = Account.find(params[:id])
-  end
-
-  def set_first_last_page(statuses) # rubocop:disable Style/AccessorMethodName
-    return if statuses.empty?
-
-    @first_page_url = api_activitypub_outbox_url(max_id: statuses.first.id + 1)
-    @last_page_url = api_activitypub_outbox_url(since_id: statuses.last.id - 1)
-  end
-
-  def pagination_params(core_params)
-    params.permit(:local, :limit).merge(core_params)
-  end
-end
diff --git a/app/controllers/follower_accounts_controller.rb b/app/controllers/follower_accounts_controller.rb
index 1e7c7c406..e58c5ad46 100644
--- a/app/controllers/follower_accounts_controller.rb
+++ b/app/controllers/follower_accounts_controller.rb
@@ -5,5 +5,25 @@ class FollowerAccountsController < ApplicationController
 
   def index
     @follows = Follow.where(target_account: @account).recent.page(params[:page]).per(FOLLOW_PER_PAGE).preload(:account)
+
+    respond_to do |format|
+      format.html
+
+      format.json do
+        render json: collection_presenter, serializer: ActivityPub::CollectionSerializer, adapter: ActivityPub::Adapter
+      end
+    end
+  end
+
+  private
+
+  def collection_presenter
+    ActivityPub::CollectionPresenter.new(
+      id: account_followers_url(@account),
+      type: :ordered,
+      current: account_followers_url(@account),
+      size: @account.followers_count,
+      items: @follows.map { |f| ActivityPub::TagManager.instance.uri_for(f.account) }
+    )
   end
 end
diff --git a/app/controllers/following_accounts_controller.rb b/app/controllers/following_accounts_controller.rb
index f4488eef5..69f29cd70 100644
--- a/app/controllers/following_accounts_controller.rb
+++ b/app/controllers/following_accounts_controller.rb
@@ -5,5 +5,25 @@ class FollowingAccountsController < ApplicationController
 
   def index
     @follows = Follow.where(account: @account).recent.page(params[:page]).per(FOLLOW_PER_PAGE).preload(:target_account)
+
+    respond_to do |format|
+      format.html
+
+      format.json do
+        render json: collection_presenter, serializer: ActivityPub::CollectionSerializer, adapter: ActivityPub::Adapter
+      end
+    end
+  end
+
+  private
+
+  def collection_presenter
+    ActivityPub::CollectionPresenter.new(
+      id: account_following_index_url(@account),
+      type: :ordered,
+      current: account_following_index_url(@account),
+      size: @account.following_count,
+      items: @follows.map { |f| ActivityPub::TagManager.instance.uri_for(f.target_account) }
+    )
   end
 end
diff --git a/app/controllers/statuses_controller.rb b/app/controllers/statuses_controller.rb
index 59c9d0a87..8e0ce0ec3 100644
--- a/app/controllers/statuses_controller.rb
+++ b/app/controllers/statuses_controller.rb
@@ -11,10 +11,22 @@ class StatusesController < ApplicationController
   before_action :check_account_suspension
 
   def show
-    @ancestors   = @status.reply? ? cache_collection(@status.ancestors(current_account), Status) : []
-    @descendants = cache_collection(@status.descendants(current_account), Status)
+    respond_to do |format|
+      format.html do
+        @ancestors   = @status.reply? ? cache_collection(@status.ancestors(current_account), Status) : []
+        @descendants = cache_collection(@status.descendants(current_account), Status)
+
+        render 'stream_entries/show'
+      end
+
+      format.json do
+        render json: @status, serializer: ActivityPub::NoteSerializer, adapter: ActivityPub::Adapter
+      end
+    end
+  end
 
-    render 'stream_entries/show'
+  def activity
+    render json: @status, serializer: ActivityPub::ActivitySerializer, adapter: ActivityPub::Adapter
   end
 
   private
diff --git a/app/controllers/tags_controller.rb b/app/controllers/tags_controller.rb
index 53149edf0..8bcce9e13 100644
--- a/app/controllers/tags_controller.rb
+++ b/app/controllers/tags_controller.rb
@@ -5,7 +5,27 @@ class TagsController < ApplicationController
 
   def show
     @tag      = Tag.find_by!(name: params[:id].downcase)
-    @statuses = @tag.nil? ? [] : Status.as_tag_timeline(@tag, current_account, params[:local]).paginate_by_max_id(20, params[:max_id])
+    @statuses = Status.as_tag_timeline(@tag, current_account, params[:local]).paginate_by_max_id(20, params[:max_id])
     @statuses = cache_collection(@statuses, Status)
+
+    respond_to do |format|
+      format.html
+
+      format.json do
+        render json: collection_presenter, serializer: ActivityPub::CollectionSerializer, adapter: ActivityPub::Adapter
+      end
+    end
+  end
+
+  private
+
+  def collection_presenter
+    ActivityPub::CollectionPresenter.new(
+      id: tag_url(@tag),
+      type: :ordered,
+      current: tag_url(@tag),
+      size: @tag.statuses.count,
+      items: @statuses.map { |s| ActivityPub::TagManager.instance.uri_for(s) }
+    )
   end
 end
diff --git a/app/helpers/activitystreams2_builder_helper.rb b/app/helpers/activitystreams2_builder_helper.rb
deleted file mode 100644
index 717b470f0..000000000
--- a/app/helpers/activitystreams2_builder_helper.rb
+++ /dev/null
@@ -1,8 +0,0 @@
-# frozen_string_literal: true
-
-module Activitystreams2BuilderHelper
-  # Gets a usable name for an account, using display name or username.
-  def account_name(account)
-    account.display_name.presence || account.username
-  end
-end
diff --git a/app/lib/activitypub/adapter.rb b/app/lib/activitypub/adapter.rb
new file mode 100644
index 000000000..0a70207bc
--- /dev/null
+++ b/app/lib/activitypub/adapter.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class ActivityPub::Adapter < ActiveModelSerializers::Adapter::Base
+  def self.default_key_transform
+    :camel_lower
+  end
+
+  def serializable_hash(options = nil)
+    options = serialization_options(options)
+    serialized_hash = { '@context': 'https://www.w3.org/ns/activitystreams' }.merge(ActiveModelSerializers::Adapter::Attributes.new(serializer, instance_options).serializable_hash(options))
+    self.class.transform_key_casing!(serialized_hash, instance_options)
+  end
+end
diff --git a/app/lib/activitypub/tag_manager.rb b/app/lib/activitypub/tag_manager.rb
new file mode 100644
index 000000000..ec42bcad3
--- /dev/null
+++ b/app/lib/activitypub/tag_manager.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+require 'singleton'
+
+class ActivityPub::TagManager
+  include Singleton
+  include RoutingHelper
+
+  COLLECTIONS = {
+    public: 'https://www.w3.org/ns/activitystreams#Public',
+  }.freeze
+
+  def url_for(target)
+    return target.url if target.respond_to?(:local?) && !target.local?
+
+    case target.object_type
+    when :person
+      short_account_url(target)
+    when :note, :comment, :activity
+      short_account_status_url(target.account, target)
+    end
+  end
+
+  def uri_for(target)
+    return target.uri if target.respond_to?(:local?) && !target.local?
+
+    case target.object_type
+    when :person
+      account_url(target)
+    when :note, :comment, :activity
+      account_status_url(target.account, target)
+    end
+  end
+
+  # Primary audience of a status
+  # Public statuses go out to primarily the public collection
+  # Unlisted and private statuses go out primarily to the followers collection
+  # Others go out only to the people they mention
+  def to(status)
+    case status.visibility
+    when 'public'
+      [COLLECTIONS[:public]]
+    when 'unlisted', 'private'
+      [account_followers_url(status.account)]
+    when 'direct'
+      status.mentions.map { |mention| uri_for(mention.account) }
+    end
+  end
+
+  # Secondary audience of a status
+  # Public statuses go out to followers as well
+  # Unlisted statuses go to the public as well
+  # Both of those and private statuses also go to the people mentioned in them
+  # Direct ones don't have a secondary audience
+  def cc(status)
+    cc = []
+
+    case status.visibility
+    when 'public'
+      cc << account_followers_url(status.account)
+    when 'unlisted'
+      cc << COLLECTIONS[:public]
+    end
+
+    cc.concat(status.mentions.map { |mention| uri_for(mention.account) }) unless status.direct_visibility?
+
+    cc
+  end
+end
diff --git a/app/presenters/activitypub/collection_presenter.rb b/app/presenters/activitypub/collection_presenter.rb
new file mode 100644
index 000000000..6bae2955e
--- /dev/null
+++ b/app/presenters/activitypub/collection_presenter.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class ActivityPub::CollectionPresenter < ActiveModelSerializers::Model
+  attributes :id, :type, :current, :size, :items
+end
diff --git a/app/serializers/activitypub/activity_serializer.rb b/app/serializers/activitypub/activity_serializer.rb
new file mode 100644
index 000000000..69e2160c5
--- /dev/null
+++ b/app/serializers/activitypub/activity_serializer.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class ActivityPub::ActivitySerializer < ActiveModel::Serializer
+  attributes :id, :type, :actor, :to, :cc
+
+  has_one :proper, key: :object, serializer: ActivityPub::NoteSerializer
+
+  def id
+    [ActivityPub::TagManager.instance.uri_for(object), '/activity'].join
+  end
+
+  def type
+    object.reblog? ? 'Announce' : 'Create'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def to
+    ActivityPub::TagManager.instance.to(object)
+  end
+
+  def cc
+    ActivityPub::TagManager.instance.cc(object)
+  end
+end
diff --git a/app/serializers/activitypub/actor_serializer.rb b/app/serializers/activitypub/actor_serializer.rb
new file mode 100644
index 000000000..56806152e
--- /dev/null
+++ b/app/serializers/activitypub/actor_serializer.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+class ActivityPub::ActorSerializer < ActiveModel::Serializer
+  include RoutingHelper
+
+  attributes :id, :type, :following, :followers,
+             :inbox, :outbox, :preferred_username,
+             :name, :summary, :icon, :image
+
+  def id
+    account_url(object)
+  end
+
+  def type
+    'Person'
+  end
+
+  def following
+    account_following_index_url(object)
+  end
+
+  def followers
+    account_followers_url(object)
+  end
+
+  def inbox
+    nil
+  end
+
+  def outbox
+    account_outbox_url(object)
+  end
+
+  def preferred_username
+    object.username
+  end
+
+  def name
+    object.display_name
+  end
+
+  def summary
+    Formatter.instance.simplified_format(object)
+  end
+
+  def icon
+    full_asset_url(object.avatar.url(:original))
+  end
+
+  def image
+    full_asset_url(object.header.url(:original))
+  end
+end
diff --git a/app/serializers/activitypub/collection_serializer.rb b/app/serializers/activitypub/collection_serializer.rb
new file mode 100644
index 000000000..baaba7654
--- /dev/null
+++ b/app/serializers/activitypub/collection_serializer.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class ActivityPub::CollectionSerializer < ActiveModel::Serializer
+  def self.serializer_for(model, options)
+    return ActivityPub::ActivitySerializer if model.class.name == 'Status'
+    super
+  end
+
+  attributes :id, :type, :total_items,
+             :current
+
+  has_many :items, key: :ordered_items
+
+  def type
+    case object.type
+    when :ordered
+      'OrderedCollection'
+    else
+      'Collection'
+    end
+  end
+
+  def total_items
+    object.size
+  end
+end
diff --git a/app/serializers/activitypub/note_serializer.rb b/app/serializers/activitypub/note_serializer.rb
new file mode 100644
index 000000000..ffdc6175d
--- /dev/null
+++ b/app/serializers/activitypub/note_serializer.rb
@@ -0,0 +1,106 @@
+# frozen_string_literal: true
+
+class ActivityPub::NoteSerializer < ActiveModel::Serializer
+  attributes :id, :type, :summary, :content,
+             :in_reply_to, :published, :url,
+             :actor, :to, :cc, :sensitive
+
+  has_many :media_attachments, key: :attachment
+  has_many :virtual_tags, key: :tag
+
+  def id
+    ActivityPub::TagManager.instance.uri_for(object)
+  end
+
+  def type
+    'Note'
+  end
+
+  def summary
+    object.spoiler_text.presence
+  end
+
+  def content
+    Formatter.instance.format(object)
+  end
+
+  def in_reply_to
+    ActivityPub::TagManager.instance.uri_for(object.thread) if object.reply?
+  end
+
+  def published
+    object.created_at.iso8601
+  end
+
+  def url
+    ActivityPub::TagManager.instance.url_for(object)
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def to
+    ActivityPub::TagManager.instance.to(object)
+  end
+
+  def cc
+    ActivityPub::TagManager.instance.cc(object)
+  end
+
+  def virtual_tags
+    object.mentions + object.tags
+  end
+
+  class MediaAttachmentSerializer < ActiveModel::Serializer
+    include RoutingHelper
+
+    attributes :type, :media_type, :url
+
+    def type
+      'Document'
+    end
+
+    def media_type
+      object.file_content_type
+    end
+
+    def url
+      object.local? ? full_asset_url(object.file.url(:original, false)) : object.remote_url
+    end
+  end
+
+  class MentionSerializer < ActiveModel::Serializer
+    attributes :type, :href, :name
+
+    def type
+      'Mention'
+    end
+
+    def href
+      ActivityPub::TagManager.instance.uri_for(object.account)
+    end
+
+    def name
+      "@#{object.account.acct}"
+    end
+  end
+
+  class TagSerializer < ActiveModel::Serializer
+    include RoutingHelper
+
+    attributes :type, :href, :name
+
+    def type
+      'Hashtag'
+    end
+
+    def href
+      tag_url(object)
+    end
+
+    def name
+      "##{object.name}"
+    end
+  end
+end
diff --git a/app/views/accounts/show.activitystreams2.rabl b/app/views/accounts/show.activitystreams2.rabl
deleted file mode 100644
index 2c0a4ad3a..000000000
--- a/app/views/accounts/show.activitystreams2.rabl
+++ /dev/null
@@ -1,9 +0,0 @@
-extends 'activitypub/types/person.activitystreams2.rabl'
-
-object @account
-
-attributes display_name: :name, username: :preferredUsername, note: :summary
-
-node(:icon)   { |account| full_asset_url(account.avatar.url(:original)) }
-node(:image)  { |account| full_asset_url(account.header.url(:original)) }
-node(:outbox) { |account| api_activitypub_outbox_url(account.id) }
diff --git a/app/views/activitypub/base.activitystreams2.rabl b/app/views/activitypub/base.activitystreams2.rabl
deleted file mode 100644
index c5e94997a..000000000
--- a/app/views/activitypub/base.activitystreams2.rabl
+++ /dev/null
@@ -1 +0,0 @@
-node(:'@context') { 'https://www.w3.org/ns/activitystreams' }
diff --git a/app/views/activitypub/intransient.activitystreams2.rabl b/app/views/activitypub/intransient.activitystreams2.rabl
deleted file mode 100644
index 968e451c2..000000000
--- a/app/views/activitypub/intransient.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/base.activitystreams2.rabl'
-
-node(:id) { request.original_url }
diff --git a/app/views/activitypub/types/announce.activitystreams2.rabl b/app/views/activitypub/types/announce.activitystreams2.rabl
deleted file mode 100644
index 4a29aa134..000000000
--- a/app/views/activitypub/types/announce.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/intransient.activitystreams2.rabl'
-
-node(:type) { 'Announce' }
diff --git a/app/views/activitypub/types/collection.activitystreams2.rabl b/app/views/activitypub/types/collection.activitystreams2.rabl
deleted file mode 100644
index cc0e532b7..000000000
--- a/app/views/activitypub/types/collection.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/intransient.activitystreams2.rabl'
-
-node(:type) { 'Collection' }
diff --git a/app/views/activitypub/types/create.activitystreams2.rabl b/app/views/activitypub/types/create.activitystreams2.rabl
deleted file mode 100644
index e41a056a7..000000000
--- a/app/views/activitypub/types/create.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/intransient.activitystreams2.rabl'
-
-node(:type) { 'Create' }
diff --git a/app/views/activitypub/types/note.activitystreams2.rabl b/app/views/activitypub/types/note.activitystreams2.rabl
deleted file mode 100644
index 39c74d4ba..000000000
--- a/app/views/activitypub/types/note.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/intransient.activitystreams2.rabl'
-
-node(:type) { 'Note' }
diff --git a/app/views/activitypub/types/ordered_collection.activitystreams2.rabl b/app/views/activitypub/types/ordered_collection.activitystreams2.rabl
deleted file mode 100644
index 2cda6f4d0..000000000
--- a/app/views/activitypub/types/ordered_collection.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/types/collection.activitystreams2.rabl'
-
-node(:type) { 'OrderedCollection' }
diff --git a/app/views/activitypub/types/ordered_collection_page.activitystreams2.rabl b/app/views/activitypub/types/ordered_collection_page.activitystreams2.rabl
deleted file mode 100644
index 9937d11e9..000000000
--- a/app/views/activitypub/types/ordered_collection_page.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/types/ordered_collection.activitystreams2.rabl'
-
-node(:type) { 'OrderedCollectionPage' }
diff --git a/app/views/activitypub/types/person.activitystreams2.rabl b/app/views/activitypub/types/person.activitystreams2.rabl
deleted file mode 100644
index 487a60791..000000000
--- a/app/views/activitypub/types/person.activitystreams2.rabl
+++ /dev/null
@@ -1,3 +0,0 @@
-extends 'activitypub/intransient.activitystreams2.rabl'
-
-node(:type) { 'Person' }
diff --git a/app/views/api/activitypub/activities/_show_status.activitystreams2.rabl b/app/views/api/activitypub/activities/_show_status.activitystreams2.rabl
deleted file mode 100644
index 472bf5dbd..000000000
--- a/app/views/api/activitypub/activities/_show_status.activitystreams2.rabl
+++ /dev/null
@@ -1,4 +0,0 @@
-object @status
-
-node(:actor)     { |status| TagManager.instance.url_for(status.account) }
-node(:published) { |status| status.created_at.to_time.xmlschema }
\ No newline at end of file
diff --git a/app/views/api/activitypub/activities/show_status_announce.activitystreams2.rabl b/app/views/api/activitypub/activities/show_status_announce.activitystreams2.rabl
deleted file mode 100644
index 44ac1ba2f..000000000
--- a/app/views/api/activitypub/activities/show_status_announce.activitystreams2.rabl
+++ /dev/null
@@ -1,8 +0,0 @@
-extends 'activitypub/types/announce.activitystreams2.rabl'
-extends 'api/activitypub/activities/_show_status.activitystreams2.rabl'
-
-object @status
-
-node(:name)   { |status| t('activitypub.activity.announce.name', account_name: account_name(status.account)) }
-node(:url)    { |status| TagManager.instance.url_for(status) }
-node(:object) { |status| api_activitypub_status_url(status.reblog_of_id) }
diff --git a/app/views/api/activitypub/activities/show_status_create.activitystreams2.rabl b/app/views/api/activitypub/activities/show_status_create.activitystreams2.rabl
deleted file mode 100644
index ff4d39eca..000000000
--- a/app/views/api/activitypub/activities/show_status_create.activitystreams2.rabl
+++ /dev/null
@@ -1,8 +0,0 @@
-extends 'activitypub/types/create.activitystreams2.rabl'
-extends 'api/activitypub/activities/_show_status.activitystreams2.rabl'
-
-object @status
-
-node(:name)   { |status| t('activitypub.activity.create.name', account_name: account_name(status.account)) }
-node(:url)    { |status| TagManager.instance.url_for(status) }
-node(:object) { |status| api_activitypub_note_url(status) }
diff --git a/app/views/api/activitypub/notes/show.activitystreams2.rabl b/app/views/api/activitypub/notes/show.activitystreams2.rabl
deleted file mode 100644
index d962f4438..000000000
--- a/app/views/api/activitypub/notes/show.activitystreams2.rabl
+++ /dev/null
@@ -1,11 +0,0 @@
-extends 'activitypub/types/note.activitystreams2.rabl'
-
-object @status
-
-attributes :content
-
-node(:name)         { |status| status.content }
-node(:url)          { |status| TagManager.instance.url_for(status) }
-node(:attributedTo) { |status| TagManager.instance.url_for(status.account) }
-node(:inReplyTo)    { |status| api_activitypub_note_url(status.thread) } if @status.thread
-node(:published)    { |status| status.created_at.to_time.xmlschema }
diff --git a/app/views/api/activitypub/outbox/show.activitystreams2.rabl b/app/views/api/activitypub/outbox/show.activitystreams2.rabl
deleted file mode 100644
index 273b15e82..000000000
--- a/app/views/api/activitypub/outbox/show.activitystreams2.rabl
+++ /dev/null
@@ -1,12 +0,0 @@
-extends 'activitypub/types/ordered_collection.activitystreams2.rabl'
-
-object @account
-
-node(:totalItems) { @statuses.count }
-node(:current)    { @first_page_url } if @first_page_url
-node(:first)      { @first_page_url } if @first_page_url
-node(:last)       { @last_page_url } if @last_page_url
-
-node(:name)       { |account| t('activitypub.outbox.name', account_name: account_name(account)) }
-node(:summary)    { |account| t('activitypub.outbox.summary', account_name: account_name(account)) }
-node(:updated)    { |account| (@statuses.empty? ? account.created_at.to_time : @statuses.first.updated_at.to_time).xmlschema }
diff --git a/app/views/api/activitypub/outbox/show_page.activitystreams2.rabl b/app/views/api/activitypub/outbox/show_page.activitystreams2.rabl
deleted file mode 100644
index b6433ccf2..000000000
--- a/app/views/api/activitypub/outbox/show_page.activitystreams2.rabl
+++ /dev/null
@@ -1,16 +0,0 @@
-extends 'activitypub/types/ordered_collection_page.activitystreams2.rabl'
-
-object @account
-
-node(:items) do
-  @statuses.map { |status| api_activitypub_status_url(status) }
-end
-
-node(:next)       { @next_page_url } if @next_page_url
-node(:prev)       { @prev_page_url } if @prev_page_url
-node(:current)    { @first_page_url } if @first_page_url
-node(:first)      { @first_page_url } if @first_page_url
-node(:last)       { @last_page_url } if @last_page_url
-node(:partOf)     { @part_of_url } if @part_of_url
-
-node(:updated)    { |account| (@statuses.empty? ? account.created_at.to_time : @statuses.first.updated_at.to_time).xmlschema }
diff --git a/app/views/well_known/webfinger/show.json.rabl b/app/views/well_known/webfinger/show.json.rabl
index 123d1d11a..af11cd207 100644
--- a/app/views/well_known/webfinger/show.json.rabl
+++ b/app/views/well_known/webfinger/show.json.rabl
@@ -3,14 +3,14 @@ object @account
 node(:subject) { @canonical_account_uri }
 
 node(:aliases) do
-  [TagManager.instance.url_for(@account), TagManager.instance.uri_for(@account)]
+  [short_account_url(@account), account_url(@account)]
 end
 
 node(:links) do
   [
-    { rel: 'http://webfinger.net/rel/profile-page', type: 'text/html', href: TagManager.instance.url_for(@account) },
+    { rel: 'http://webfinger.net/rel/profile-page', type: 'text/html', href: account_url(@account) },
     { rel: 'http://schemas.google.com/g/2010#updates-from', type: 'application/atom+xml', href: account_url(@account, format: 'atom') },
-    { rel: 'self', type: 'application/activity+json', href: TagManager.instance.url_for(@account) },
+    { rel: 'self', type: 'application/activity+json', href: account_url(@account) },
     { rel: 'salmon', href: api_salmon_url(@account.id) },
     { rel: 'magic-public-key', href: "data:application/magic-public-key,#{@magic_key}" },
     { rel: 'http://ostatus.org/schema/1.0/subscribe', template: "#{authorize_follow_url}?acct={uri}" },
diff --git a/app/views/well_known/webfinger/show.xml.ruby b/app/views/well_known/webfinger/show.xml.ruby
index fc0ab5b84..844742d68 100644
--- a/app/views/well_known/webfinger/show.xml.ruby
+++ b/app/views/well_known/webfinger/show.xml.ruby
@@ -1,10 +1,11 @@
 Nokogiri::XML::Builder.new do |xml|
   xml.XRD(xmlns: 'http://docs.oasis-open.org/ns/xri/xrd-1.0') do
     xml.Subject @canonical_account_uri
-    xml.Alias TagManager.instance.url_for(@account)
-    xml.Alias TagManager.instance.uri_for(@account)
+    xml.Alias short_account_url(@account)
+    xml.Alias account_url(@account)
     xml.Link(rel: 'http://webfinger.net/rel/profile-page', type: 'text/html', href: TagManager.instance.url_for(@account))
     xml.Link(rel: 'http://schemas.google.com/g/2010#updates-from', type: 'application/atom+xml', href: account_url(@account, format: 'atom'))
+    xml.Link(rel: 'self', type: 'application/activity+json', href: account_url(@account))
     xml.Link(rel: 'salmon', href: api_salmon_url(@account.id))
     xml.Link(rel: 'magic-public-key', href: "data:application/magic-public-key,#{@magic_key}")
     xml.Link(rel: 'http://ostatus.org/schema/1.0/subscribe', template: "#{authorize_follow_url}?acct={uri}")
diff --git a/config/initializers/inflections.rb b/config/initializers/inflections.rb
index a7b1ef690..26275d092 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -14,4 +14,6 @@ ActiveSupport::Inflector.inflections(:en) do |inflect|
   inflect.acronym 'StatsD'
   inflect.acronym 'OEmbed'
   inflect.acronym 'ActivityPub'
+  inflect.acronym 'PubSubHubbub'
+  inflect.acronym 'ActivityStreams'
 end
diff --git a/config/initializers/mime_types.rb b/config/initializers/mime_types.rb
index b1b73c846..30e91ad63 100644
--- a/config/initializers/mime_types.rb
+++ b/config/initializers/mime_types.rb
@@ -1,5 +1,4 @@
 # Be sure to restart your server when you modify this file.
 
-Mime::Type.register "application/json",           :json, %w( text/x-json application/jsonrequest application/jrd+json )
-Mime::Type.register "text/xml",                   :xml,  %w( application/xml application/atom+xml application/xrd+xml )
-Mime::Type.register "application/activity+json",  :activitystreams2
+Mime::Type.register 'application/json', :json, %w(text/x-json application/jsonrequest application/jrd+json application/activity+json)
+Mime::Type.register 'text/xml',         :xml,  %w(application/xml application/atom+xml application/xrd+xml)
diff --git a/config/locales/ca.yml b/config/locales/ca.yml
index f63aee3e6..0ba893a12 100644
--- a/config/locales/ca.yml
+++ b/config/locales/ca.yml
@@ -30,15 +30,6 @@ ca:
     remote_follow: Seguir
     reserved_username: El nom d'usuari està reservat
     unfollow: Deixar de seguir
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} shared an activity."
-      create:
-        name: "%{account_name} created a note."
-    outbox:
-      name: "%{account_name}'s Outbox"
-      summary: A collection of activities from user %{account_name}.
   admin:
     accounts:
       are_you_sure: Estàs segur?
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 79efddfad..be1f15e25 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -44,15 +44,6 @@ en:
     remote_follow: Remote follow
     reserved_username: The username is reserved
     unfollow: Unfollow
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} shared an activity."
-      create:
-        name: "%{account_name} created a note."
-    outbox:
-      name: "%{account_name}'s Outbox"
-      summary: A collection of activities from user %{account_name}.
   admin:
     accounts:
       are_you_sure: Are you sure?
diff --git a/config/locales/fa.yml b/config/locales/fa.yml
index ade76d670..218d859bb 100644
--- a/config/locales/fa.yml
+++ b/config/locales/fa.yml
@@ -29,15 +29,6 @@ fa:
     posts: نوشته
     remote_follow: پیگیری غیرمستقیم
     unfollow: پایان پیگیری
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} فعالیتی آغاز کرد."
-      create:
-        name: "%{account_name} یادداشتی نوشت."
-    outbox:
-      name: صندوق خروجی %{account_name}
-      summary: مجموعه‌ای از فعالیت‌های کاربر %{account_name}.
   admin:
     accounts:
       are_you_sure: آیا مطمئن هستید؟
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index cba217651..65e681b20 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -30,15 +30,6 @@ fr:
     remote_follow: Suivre à distance
     reserved_username: Ce nom d’utilisateur⋅ice est réservé
     unfollow: Ne plus suivre
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} a partagé une activité."
-      create:
-        name: "%{account_name} a créé une note."
-    outbox:
-      name: Boîte d’envoi de %{account_name}
-      summary: Liste d’activités de %{account_name}
   admin:
     accounts:
       are_you_sure: Êtes-vous certain⋅e ?
diff --git a/config/locales/he.yml b/config/locales/he.yml
index 21f8f1dc4..251b6914e 100644
--- a/config/locales/he.yml
+++ b/config/locales/he.yml
@@ -29,15 +29,6 @@ he:
     posts: הודעות
     remote_follow: מעקב מרחוק
     unfollow: הפסקת מעקב
-  activitypub:
-    activity:
-      announce:
-        name: הודעה שותפה על ידי %{account_name}.
-      create:
-        name: הודעה חדשה מאת %{account_name}.
-    outbox:
-      name: תיבת הדוא"ל היוצא של %{account_name}
-      summary: אוסף הפעילויות של %{account_name}.
   admin:
     accounts:
       are_you_sure: בטוח?
diff --git a/config/locales/id.yml b/config/locales/id.yml
index e3fe96331..7bda52c78 100644
--- a/config/locales/id.yml
+++ b/config/locales/id.yml
@@ -29,15 +29,6 @@ id:
     posts: Postingan
     remote_follow: Mengikuti
     unfollow: Berhenti mengikuti
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} membagikan aktivitas."
-      create:
-        name: "%{account_name} membuat catatan."
-    outbox:
-      name: "%{account_name} Outbox"
-      summary: Koleksi aktivitas dari pengguna %{account_name}.
   admin:
     accounts:
       are_you_sure: Anda yakin?
diff --git a/config/locales/ja.yml b/config/locales/ja.yml
index 37d82a205..fda87526d 100644
--- a/config/locales/ja.yml
+++ b/config/locales/ja.yml
@@ -30,15 +30,6 @@ ja:
     remote_follow: リモートフォロー
     reserved_username: このユーザー名は予約されています。
     unfollow: フォロー解除
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} さんがアクティビティをシェアしました"
-      create:
-        name: "%{account_name} さんがノートを作成しました"
-    outbox:
-      name: "%{account_name} さんの送信トレイ"
-      summary: "%{account_name} さんからのアクティビティコレクション"
   admin:
     accounts:
       are_you_sure: 本当に実行しますか?
diff --git a/config/locales/ko.yml b/config/locales/ko.yml
index bafc19993..c7c310cfe 100644
--- a/config/locales/ko.yml
+++ b/config/locales/ko.yml
@@ -30,15 +30,6 @@ ko:
     remote_follow: 리모트 팔로우
     reserved_username: 이 아이디는 예약되어 있습니다.
     unfollow: 팔로우 해제
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} 님이 액티비티를 공유했습니다"
-      create:
-        name: "%{account_name} 님이 노트를 작성했습니다"
-    outbox:
-      name: "%{account_name} 님의 송신함"
-      summary: "%{account_name} 님의 액티비티 모음"
   admin:
     accounts:
       are_you_sure: 정말로 실행하시겠습니까?
diff --git a/config/locales/no.yml b/config/locales/no.yml
index 004e1ff80..cf94524d2 100644
--- a/config/locales/no.yml
+++ b/config/locales/no.yml
@@ -29,15 +29,6 @@
     posts: Poster
     remote_follow: Følg fra andre instanser
     unfollow: Avfølg
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} delte en aktivitet."
-      create:
-        name: "%{account_name} laget en aktivitet."
-    outbox:
-      name: "%{account_name} sin utboks"
-      summary: En samling aktiviteter fra brukeren %{account_name}.
   admin:
     accounts:
       are_you_sure: Er du sikker?
diff --git a/config/locales/oc.yml b/config/locales/oc.yml
index 91a6ca791..2eb85be58 100644
--- a/config/locales/oc.yml
+++ b/config/locales/oc.yml
@@ -29,15 +29,6 @@ oc:
     posts: Estatuts
     remote_follow: Sègre a distància
     unfollow: Quitar de sègre
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} a partejat una activitat."
-      create:
-        name: "%{account_name} a creat una nòta."
-    outbox:
-      name: "%{account_name}'s Outbox"
-      summary: A collection of activities from user %{account_name}.
   admin:
     accounts:
       are_you_sure: Sètz segur ?
diff --git a/config/locales/pl.yml b/config/locales/pl.yml
index 9ee6c0540..6f2831670 100644
--- a/config/locales/pl.yml
+++ b/config/locales/pl.yml
@@ -44,15 +44,6 @@ pl:
     remote_follow: Zdalne śledzenie
     reserved_username: Ta nazwa użytkownika jest zarezerwowana.
     unfollow: Przestań śledzić
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} udostępnił(a) aktywność."
-      create:
-        name: "%{account_name} utworzył(a) wpis."
-    outbox:
-      name: Skrzynka %{account_name}
-      summary: Zbiór aktywności użytkownika %{account_name}.
   admin:
     accounts:
       are_you_sure: Jesteś tego pewien?
diff --git a/config/locales/pt-BR.yml b/config/locales/pt-BR.yml
index 355c20d05..5ba763ae4 100644
--- a/config/locales/pt-BR.yml
+++ b/config/locales/pt-BR.yml
@@ -29,15 +29,6 @@ pt-BR:
     posts: Posts
     remote_follow: Acesso remoto
     unfollow: Unfollow
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} compartilhou uma atividade."
-      create:
-        name: "%{account_name} criou uma nota."
-    outbox:
-      name: "%{account_name}'s Outbox"
-      summary: Uma coleção de atividades do usuário %{account_name}.
   admin:
     accounts:
       are_you_sure: Você tem certeza?
diff --git a/config/locales/pt.yml b/config/locales/pt.yml
index 40be8a6c5..346fcdda8 100644
--- a/config/locales/pt.yml
+++ b/config/locales/pt.yml
@@ -29,15 +29,6 @@ pt:
     posts: Posts
     remote_follow: Seguir remotamente
     unfollow: Deixar de seguir
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} anunciou uma atividade."
-      create:
-        name: "%{account_name} criou uma nota."
-    outbox:
-      name: "%{account_name}'s Outbox"
-      summary: Uma coleção de atividades do usuário %{account_name}.
   admin:
     accounts:
       are_you_sure: Tens a certeza?
diff --git a/config/locales/th.yml b/config/locales/th.yml
index 263babdd0..17eb96110 100644
--- a/config/locales/th.yml
+++ b/config/locales/th.yml
@@ -29,15 +29,6 @@ th:
     posts: โพสต์
     remote_follow: Remote follow
     unfollow: เลิกติดตาม
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} แชร์กิจกรรม."
-      create:
-        name: "%{account_name} สร้างโน๊ต."
-    outbox:
-      name: "%{account_name}'s Outbox"
-      summary: รวมกิจกรรมของผู้ใช้ %{account_name}.
   admin:
     accounts:
       are_you_sure: แน่ใจนะ?
diff --git a/config/locales/tr.yml b/config/locales/tr.yml
index e7864cc57..bb83991cd 100644
--- a/config/locales/tr.yml
+++ b/config/locales/tr.yml
@@ -29,15 +29,6 @@ tr:
     posts: Gönderiler
     remote_follow: Uzaktan takip et
     unfollow: Takibi bırak
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} bir aktivite paylaştı."
-      create:
-        name: "%{account_name} bir not oluşturdu."
-    outbox:
-      name: "%{account_name}'in Gönderdikleri"
-      summary: "%{account_name}'den gelen aktiviteler."
   admin:
     accounts:
       are_you_sure: Emin misiniz?
diff --git a/config/locales/zh-CN.yml b/config/locales/zh-CN.yml
index 650d4bd15..0526ec1ba 100644
--- a/config/locales/zh-CN.yml
+++ b/config/locales/zh-CN.yml
@@ -29,15 +29,6 @@ zh-CN:
     posts: 嘟文
     remote_follow: 跨站关注
     unfollow: 取消关注
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} 分享了一个活动。"
-      create:
-        name: "%{account_name} 创建了一个记事。"
-    outbox:
-      name: "%{account_name} 的集合"
-      summary: "%{account_name} 的活动集合"
   admin:
     accounts:
       are_you_sure: 你确定吗？
diff --git a/config/locales/zh-HK.yml b/config/locales/zh-HK.yml
index d2db78be1..06f9ab63d 100644
--- a/config/locales/zh-HK.yml
+++ b/config/locales/zh-HK.yml
@@ -29,15 +29,6 @@ zh-HK:
     posts: 文章
     remote_follow: 跨站關注
     unfollow: 取消關注
-  activitypub:
-    activity:
-      announce:
-        name: "%{account_name} 分享了一項活動。"
-      create:
-        name: "%{account_name} 新增了一篇筆記。"
-    outbox:
-      name: "%{account_name} 的活動"
-      summary: "%{account_name} 分享的活動列表。"
   admin:
     accounts:
       are_you_sure: 你確定嗎？
diff --git a/config/routes.rb b/config/routes.rb
index 9171d02d4..dda3534eb 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -26,7 +26,7 @@ Rails.application.routes.draw do
     confirmations:      'auth/confirmations',
   }
 
-  get '/users/:username', to: redirect('/@%{username}'), constraints: { format: :html }
+  get '/users/:username', to: redirect('/@%{username}'), constraints: lambda { |req| req.format.nil? }
 
   resources :accounts, path: 'users', only: [:show], param: :username do
     resources :stream_entries, path: 'updates', only: [:show] do
@@ -38,10 +38,17 @@ Rails.application.routes.draw do
     get :remote_follow,  to: 'remote_follow#new'
     post :remote_follow, to: 'remote_follow#create'
 
+    resources :statuses, only: [:show] do
+      member do
+        get :activity
+      end
+    end
+
     resources :followers, only: [:index], controller: :follower_accounts
     resources :following, only: [:index], controller: :following_accounts
     resource :follow, only: [:create], controller: :account_follow
     resource :unfollow, only: [:create], controller: :account_unfollow
+    resource :outbox, only: [:show], module: :activitypub
   end
 
   get '/@:username', to: 'accounts#show', as: :short_account
@@ -119,13 +126,6 @@ Rails.application.routes.draw do
     # OEmbed
     get '/oembed', to: 'oembed#show', as: :oembed
 
-    # ActivityPub
-    namespace :activitypub do
-      get '/users/:id/outbox', to: 'outbox#show', as: :outbox
-      get '/statuses/:id', to: 'activities#show_status', as: :status
-      resources :notes, only: [:show]
-    end
-
     # JSON / REST API
     namespace :v1 do
       resources :statuses, only: [:create, :show, :destroy] do
diff --git a/spec/controllers/accounts_controller_spec.rb b/spec/controllers/accounts_controller_spec.rb
index 447e2dd53..d61c8c9bd 100644
--- a/spec/controllers/accounts_controller_spec.rb
+++ b/spec/controllers/accounts_controller_spec.rb
@@ -38,7 +38,7 @@ RSpec.describe AccountsController, type: :controller do
 
     context 'activitystreams2' do
       before do
-        get :show, params: { username: alice.username }, format: 'activitystreams2'
+        get :show, params: { username: alice.username }, format: 'json'
       end
 
       it 'assigns @account' do
diff --git a/spec/controllers/api/activitypub/activities_controller_spec.rb b/spec/controllers/api/activitypub/activities_controller_spec.rb
deleted file mode 100644
index 07df28ac2..000000000
--- a/spec/controllers/api/activitypub/activities_controller_spec.rb
+++ /dev/null
@@ -1,69 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Api::ActivityPub::ActivitiesController, type: :controller do
-  render_views
-
-  let(:user)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
-
-  describe 'GET #show' do
-    describe 'normal status' do
-      public_status = nil
-
-      before do
-        public_status = Fabricate(:status, account: user.account, text: 'Hello world', visibility: :public)
-
-        @request.env['HTTP_ACCEPT'] = 'application/activity+json'
-        get :show_status, params: { id: public_status.id }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns http success' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('type' => 'Create')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('type' => 'Create')
-        expect(json_data).to include('object' => api_activitypub_note_url(public_status))
-        expect(json_data).to include('url' => TagManager.instance.url_for(public_status))
-      end
-    end
-
-    describe 'reblog' do
-      original = nil
-      reblog = nil
-
-      before do
-        original = Fabricate(:status, account: user.account, text: 'Hello world', visibility: :public)
-        reblog = Fabricate(:status, account: user.account, reblog_of_id: original.id, visibility: :public)
-
-        @request.env['HTTP_ACCEPT'] = 'application/activity+json'
-        get :show_status, params: { id: reblog.id }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns http success' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('type' => 'Announce')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('type' => 'Announce')
-        expect(json_data).to include('object' => api_activitypub_status_url(original))
-        expect(json_data).to include('url' => TagManager.instance.url_for(reblog))
-      end
-    end
-  end
-end
diff --git a/spec/controllers/api/activitypub/notes_controller_spec.rb b/spec/controllers/api/activitypub/notes_controller_spec.rb
deleted file mode 100644
index a0f05dc65..000000000
--- a/spec/controllers/api/activitypub/notes_controller_spec.rb
+++ /dev/null
@@ -1,73 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Api::ActivityPub::NotesController, type: :controller do
-  render_views
-
-  let(:user_alice)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
-  let(:user_bob)  { Fabricate(:user, account: Fabricate(:account, username: 'bob')) }
-
-  describe 'GET #show' do
-    describe 'normal status' do
-      public_status = nil
-
-      before do
-        public_status = Fabricate(:status, account: user_alice.account, text: 'Hello world', visibility: :public)
-
-        @request.env['HTTP_ACCEPT'] = 'application/activity+json'
-        get :show, params: { id: public_status.id }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns http success' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('type' => 'Note')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('name' => 'Hello world')
-        expect(json_data).to include('content' => 'Hello world')
-        expect(json_data).to include('published')
-        expect(json_data).to include('url' => TagManager.instance.url_for(public_status))
-      end
-    end
-
-    describe 'reply' do
-      original = nil
-      reply = nil
-
-      before do
-        original = Fabricate(:status, account: user_alice.account, text: 'Hello world', visibility: :public)
-        reply = Fabricate(:status, account: user_bob.account, text: 'Hello world', in_reply_to_id: original.id, visibility: :public)
-
-        @request.env['HTTP_ACCEPT'] = 'application/activity+json'
-        get :show, params: { id: reply.id }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns http success' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('type' => 'Note')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('name' => 'Hello world')
-        expect(json_data).to include('content' => 'Hello world')
-        expect(json_data).to include('published')
-        expect(json_data).to include('url' => TagManager.instance.url_for(reply))
-        expect(json_data).to include('inReplyTo' => api_activitypub_note_url(original))
-      end
-    end
-  end
-end
diff --git a/spec/controllers/api/activitypub/outbox_controller_spec.rb b/spec/controllers/api/activitypub/outbox_controller_spec.rb
deleted file mode 100644
index 049cf451d..000000000
--- a/spec/controllers/api/activitypub/outbox_controller_spec.rb
+++ /dev/null
@@ -1,156 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe Api::ActivityPub::OutboxController, type: :controller do
-  render_views
-
-  let(:user)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
-
-  describe 'GET #show' do
-    before do
-      @request.headers['ACCEPT'] = 'application/activity+json'
-    end
-
-    describe 'collection with small number of statuses' do
-      public_status = nil
-
-      before do
-        public_status = Fabricate(:status, account: user.account, text: 'Hello world', visibility: :public)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :private)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :unlisted)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :direct)
-
-        get :show, params: { id: user.account.id }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns AS2 JSON body' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('type' => 'OrderedCollection')
-        expect(json_data).to include('totalItems' => 1)
-        expect(json_data).to include('current')
-        expect(json_data).to include('first')
-        expect(json_data).to include('last')
-      end
-    end
-
-    describe 'collection with large number of statuses' do
-      before do
-        30.times do
-          Fabricate(:status, account: user.account, text: 'Hello world', visibility: :public)
-        end
-
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :private)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :unlisted)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :direct)
-
-        get :show, params: { id: user.account.id }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns AS2 JSON body' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('type' => 'OrderedCollection')
-        expect(json_data).to include('totalItems' => 30)
-        expect(json_data).to include('current')
-        expect(json_data).to include('first')
-        expect(json_data).to include('last')
-      end
-    end
-
-    describe 'page with small number of statuses' do
-      statuses = []
-
-      before do
-        5.times do
-          statuses << Fabricate(:status, account: user.account, text: 'Hello world', visibility: :public)
-        end
-
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :private)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :unlisted)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :direct)
-
-        get :show, params: { id: user.account.id, max_id: statuses.last.id + 1 }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns AS2 JSON body' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('type' => 'OrderedCollectionPage')
-        expect(json_data).to include('partOf')
-        expect(json_data).to include('items')
-        expect(json_data['items'].length).to eq(5)
-        expect(json_data).to include('prev')
-        expect(json_data).to include('next')
-        expect(json_data).to include('current')
-        expect(json_data).to include('first')
-        expect(json_data).to include('last')
-      end
-    end
-
-    describe 'page with large number of statuses' do
-      statuses = []
-
-      before do
-        30.times do
-          statuses << Fabricate(:status, account: user.account, text: 'Hello world', visibility: :public)
-        end
-
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :private)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :unlisted)
-        Fabricate(:status, account: user.account, text: 'Hello world', visibility: :direct)
-
-        get :show, params: { id: user.account.id, max_id: statuses.last.id + 1 }
-      end
-
-      it 'returns http success' do
-        expect(response).to have_http_status(:success)
-      end
-
-      it 'sets Content-Type header to AS2' do
-        expect(response.header['Content-Type']).to include 'application/activity+json'
-      end
-
-      it 'returns AS2 JSON body' do
-        json_data = JSON.parse(response.body)
-        expect(json_data).to include('@context' => 'https://www.w3.org/ns/activitystreams')
-        expect(json_data).to include('id' => @request.url)
-        expect(json_data).to include('type' => 'OrderedCollectionPage')
-        expect(json_data).to include('partOf')
-        expect(json_data).to include('items')
-        expect(json_data['items'].length).to eq(20)
-        expect(json_data).to include('prev')
-        expect(json_data).to include('next')
-        expect(json_data).to include('current')
-        expect(json_data).to include('first')
-        expect(json_data).to include('last')
-      end
-    end
-  end
-end
diff --git a/spec/controllers/well_known/webfinger_controller_spec.rb b/spec/controllers/well_known/webfinger_controller_spec.rb
index 3699efb56..466f87c45 100644
--- a/spec/controllers/well_known/webfinger_controller_spec.rb
+++ b/spec/controllers/well_known/webfinger_controller_spec.rb
@@ -9,7 +9,7 @@ describe WellKnown::WebfingerController, type: :controller do
     end
 
     before do
-      alice.private_key = <<PEM
+      alice.private_key = <<-PEM
 -----BEGIN RSA PRIVATE KEY-----
 MIICXQIBAAKBgQDHgPoPJlrfMZrVcuF39UbVssa8r4ObLP3dYl9Y17Mgp5K4mSYD
 R/Y2ag58tSi6ar2zM3Ze3QYsNfTq0NqN1g89eAu0MbSjWqpOsgntRPJiFuj3hai2
@@ -27,7 +27,7 @@ FTX8IvYBNTbpEttc1VCf/0ccnNpfb0CrFNSPWxRj7t7D
 -----END RSA PRIVATE KEY-----
 PEM
 
-      alice.public_key = <<PEM
+      alice.public_key = <<-PEM
 -----BEGIN PUBLIC KEY-----
 MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDHgPoPJlrfMZrVcuF39UbVssa8
 r4ObLP3dYl9Y17Mgp5K4mSYDR/Y2ag58tSi6ar2zM3Ze3QYsNfTq0NqN1g89eAu0
@@ -48,29 +48,23 @@ PEM
     it 'returns JSON when account can be found' do
       get :show, params: { resource: alice.to_webfinger_s }, format: :json
 
+      json = body_as_json
+
       expect(response).to have_http_status(:success)
       expect(response.content_type).to eq 'application/jrd+json'
-      expect(response.body).to eq "{\"subject\":\"acct:alice@cb6e6126.ngrok.io\",\"aliases\":[\"https://cb6e6126.ngrok.io/@alice\",\"https://cb6e6126.ngrok.io/users/alice\"],\"links\":[{\"rel\":\"http://webfinger.net/rel/profile-page\",\"type\":\"text/html\",\"href\":\"https://cb6e6126.ngrok.io/@alice\"},{\"rel\":\"http://schemas.google.com/g/2010#updates-from\",\"type\":\"application/atom+xml\",\"href\":\"https://cb6e6126.ngrok.io/users/alice.atom\"},{\"rel\":\"self\",\"type\":\"application/activity+json\",\"href\":\"https://cb6e6126.ngrok.io/@alice\"},{\"rel\":\"salmon\",\"href\":\"#{api_salmon_url(alice.id)}\"},{\"rel\":\"magic-public-key\",\"href\":\"data:application/magic-public-key,RSA.x4D6DyZa3zGa1XLhd_VG1bLGvK-Dmyz93WJfWNezIKeSuJkmA0f2NmoOfLUoumq9szN2Xt0GLDX06tDajdYPPXgLtDG0o1qqTrIJ7UTyYhbo94Wotl9iJvEwa5IjP1Mn00YJ_KvFrzKCm15PC7up6r-NtHsqoYS8X1KAqcbnptU=.AQAB\"},{\"rel\":\"http://ostatus.org/schema/1.0/subscribe\",\"template\":\"https://cb6e6126.ngrok.io/authorize_follow?acct={uri}\"}]}"
+      expect(json[:subject]).to eq 'acct:alice@cb6e6126.ngrok.io'
+      expect(json[:aliases]).to include('https://cb6e6126.ngrok.io/@alice', 'https://cb6e6126.ngrok.io/users/alice')
     end
 
     it 'returns JSON when account can be found' do
       get :show, params: { resource: alice.to_webfinger_s }, format: :xml
 
+      xml = Nokogiri::XML(response.body)
+
       expect(response).to have_http_status(:success)
       expect(response.content_type).to eq 'application/xrd+xml'
-      expect(response.body).to eq <<"XML"
-<?xml version="1.0"?>
-<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
-  <Subject>acct:alice@cb6e6126.ngrok.io</Subject>
-  <Alias>https://cb6e6126.ngrok.io/@alice</Alias>
-  <Alias>https://cb6e6126.ngrok.io/users/alice</Alias>
-  <Link rel="http://webfinger.net/rel/profile-page" type="text/html" href="https://cb6e6126.ngrok.io/@alice"/>
-  <Link rel="http://schemas.google.com/g/2010#updates-from" type="application/atom+xml" href="https://cb6e6126.ngrok.io/users/alice.atom"/>
-  <Link rel="salmon" href="#{api_salmon_url(alice.id)}"/>
-  <Link rel="magic-public-key" href="data:application/magic-public-key,RSA.x4D6DyZa3zGa1XLhd_VG1bLGvK-Dmyz93WJfWNezIKeSuJkmA0f2NmoOfLUoumq9szN2Xt0GLDX06tDajdYPPXgLtDG0o1qqTrIJ7UTyYhbo94Wotl9iJvEwa5IjP1Mn00YJ_KvFrzKCm15PC7up6r-NtHsqoYS8X1KAqcbnptU=.AQAB"/>
-  <Link rel="http://ostatus.org/schema/1.0/subscribe" template="https://cb6e6126.ngrok.io/authorize_follow?acct={uri}"/>
-</XRD>
-XML
+      expect(xml.at_xpath('//xmlns:Subject').content).to eq 'acct:alice@cb6e6126.ngrok.io'
+      expect(xml.xpath('//xmlns:Alias').map(&:content)).to include('https://cb6e6126.ngrok.io/@alice', 'https://cb6e6126.ngrok.io/users/alice')
     end
 
     it 'returns http not found when account cannot be found' do
@@ -80,19 +74,22 @@ XML
     end
 
     it 'returns JSON when account can be found with alternate domains' do
-      Rails.configuration.x.alternate_domains = ["foo.org"]
-      username, domain = alice.to_webfinger_s.split("@")
+      Rails.configuration.x.alternate_domains = ['foo.org']
+      username, = alice.to_webfinger_s.split('@')
 
       get :show, params: { resource: "#{username}@foo.org" }, format: :json
 
+      json = body_as_json
+
       expect(response).to have_http_status(:success)
       expect(response.content_type).to eq 'application/jrd+json'
-      expect(response.body).to eq "{\"subject\":\"acct:alice@cb6e6126.ngrok.io\",\"aliases\":[\"https://cb6e6126.ngrok.io/@alice\",\"https://cb6e6126.ngrok.io/users/alice\"],\"links\":[{\"rel\":\"http://webfinger.net/rel/profile-page\",\"type\":\"text/html\",\"href\":\"https://cb6e6126.ngrok.io/@alice\"},{\"rel\":\"http://schemas.google.com/g/2010#updates-from\",\"type\":\"application/atom+xml\",\"href\":\"https://cb6e6126.ngrok.io/users/alice.atom\"},{\"rel\":\"self\",\"type\":\"application/activity+json\",\"href\":\"https://cb6e6126.ngrok.io/@alice\"},{\"rel\":\"salmon\",\"href\":\"#{api_salmon_url(alice.id)}\"},{\"rel\":\"magic-public-key\",\"href\":\"data:application/magic-public-key,RSA.x4D6DyZa3zGa1XLhd_VG1bLGvK-Dmyz93WJfWNezIKeSuJkmA0f2NmoOfLUoumq9szN2Xt0GLDX06tDajdYPPXgLtDG0o1qqTrIJ7UTyYhbo94Wotl9iJvEwa5IjP1Mn00YJ_KvFrzKCm15PC7up6r-NtHsqoYS8X1KAqcbnptU=.AQAB\"},{\"rel\":\"http://ostatus.org/schema/1.0/subscribe\",\"template\":\"https://cb6e6126.ngrok.io/authorize_follow?acct={uri}\"}]}"
+      expect(json[:subject]).to eq 'acct:alice@cb6e6126.ngrok.io'
+      expect(json[:aliases]).to include('https://cb6e6126.ngrok.io/@alice', 'https://cb6e6126.ngrok.io/users/alice')
     end
 
     it 'returns http not found when account can not be found with alternate domains' do
-      Rails.configuration.x.alternate_domains = ["foo.org"]
-      username, domain = alice.to_webfinger_s.split("@")
+      Rails.configuration.x.alternate_domains = ['foo.org']
+      username, = alice.to_webfinger_s.split('@')
 
       get :show, params: { resource: "#{username}@bar.org" }, format: :json
 
diff --git a/spec/helpers/activitystreams2_builder_helper_spec.rb b/spec/helpers/activitystreams2_builder_helper_spec.rb
deleted file mode 100644
index 612ce6ad2..000000000
--- a/spec/helpers/activitystreams2_builder_helper_spec.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-describe Activitystreams2BuilderHelper, type: :helper do
-  it 'returns display name if present' do
-    account = Fabricate(:account, display_name: 'display name', username: 'username')
-    expect(account_name(account)).to eq 'display name'
-  end
-
-  it 'returns username if display name is not present' do
-    account = Fabricate(:account, display_name: '', username: 'username')
-    expect(account_name(account)).to eq 'username'
-  end
-end