Change ActivityPub paging to match spec. Clean up ActivityPub outbox changes. (#2410)

* Change ActivityPub paging to match spec. Clean up ActivityPub outbox changes.

* Fix code style and test failures for OutboxController.

* Attempt to fix CI errors.

app/views/activitypub/types/collection.activitystreams2.rabl

@@ -1,5 +1,3 @@
 extends 'activitypub/intransient.activitystreams2.rabl'
 
 node(:type)       { 'Collection' }
-node(:items)      { [] }
-node(:totalItems) { 0 }

app/views/activitypub/types/ordered_collection_page.activitystreams2.rabl

@@ -1,4 +1,3 @@
 extends 'activitypub/types/ordered_collection.activitystreams2.rabl'
 
 node(:type)     { 'OrderedCollectionPage' }
-node(:current)  { request.original_url }

app/views/api/activitypub/outbox/show.activitystreams2.rabl

@@ -1,23 +1,12 @@
-if @paginated
-  extends 'activitypub/types/ordered_collection_page.activitystreams2.rabl'
-else
-  extends 'activitypub/types/ordered_collection.activitystreams2.rabl'
-end
+extends 'activitypub/types/ordered_collection.activitystreams2.rabl'
 
 object @account
 
-node(:items) do
-  @statuses.map { |status| api_activitypub_status_url(status) }
-end
-
 node(:totalItems) { @statuses.count }
-node(:next)       { @next_path } if @next_path
-node(:prev)       { @prev_path } if @prev_path
+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) do |account|
-  times = @statuses.map { |status| status.updated_at.to_time }
-  times << account.created_at.to_time
-  times.max.xmlschema
-end
+node(:updated)    { |account| (@statuses.empty? ? account.created_at.to_time : @statuses.first.updated_at.to_time).xmlschema }

app/views/api/activitypub/outbox/show_page.activitystreams2.rabl

@@ -0,0 +1,16 @@
+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 }