Profile redirect notes (#5746)

* Serialize moved accounts into REST and ActivityPub APIs

* Parse federated moved accounts from ActivityPub

* Add note about moved accounts to public profiles

* Add moved account message to web UI

* Fix code style issues

app/views/accounts/_header.html.haml

@@ -1,6 +1,6 @@
 .card.h-card.p-author{ style: "background-image: url(#{account.header.url(:original)})" }
   .card__illustration
-    - unless account.memorial?
+    - unless account.memorial? || account.moved?
       - if user_signed_in? && current_account.id != account.id && !current_account.requested?(account)
         .controls
           - if current_account.following?(account)

app/views/accounts/_moved_strip.html.haml

@@ -0,0 +1,17 @@
+- moved_to_account = account.moved_to_account
+
+.moved-strip
+  .moved-strip__message
+    = fa_icon 'suitcase'
+    = t('accounts.moved_html', name: content_tag(:strong, display_name(account), class: :emojify), new_profile_link: link_to(content_tag(:strong, safe_join(['@', content_tag(:span, moved_to_account.acct)])), TagManager.instance.url_for(moved_to_account), class: 'mention'))
+
+  .moved-strip__card
+    = link_to TagManager.instance.url_for(moved_to_account), class: 'detailed-status__display-name p-author h-card', target: '_blank', rel: 'noopener' do
+      .detailed-status__display-avatar
+        .account__avatar-overlay
+          .account__avatar-overlay-base{ style: "background-image: url('#{moved_to_account.avatar.url(:original)}')" }
+          .account__avatar-overlay-overlay{ style: "background-image: url('#{account.avatar.url(:original)}')" }
+
+      %span.display-name
+        %strong.emojify= display_name(moved_to_account)
+        %span @#{moved_to_account.acct}

app/views/accounts/show.html.haml

@@ -14,6 +14,8 @@
 
 - if @account.memorial?
   .memoriam-strip= t('in_memoriam_html')
+- elsif @account.moved?
+  = render partial: 'moved_strip', locals: { account: @account }
 - elsif show_landing_strip?
   = render partial: 'shared/landing_strip', locals: { account: @account }