Change move handler to carry blocks over (#14144)

* Change move handler to carry blocks and mutes over

When user A blocks user B and B moves to a new account C, make A block C
accordingly.

Note that it only works if A's instance is aware of the Move, that is,
if B is on A's instance or has followers there.

* Also notify instances with known people blocking you when moving

* Add automatic account notes when blocking/muting an account that had no note

app/workers/activitypub/move_distribution_worker.rb

@@ -24,7 +24,7 @@ class ActivityPub::MoveDistributionWorker
   private
 
   def inboxes
-    @inboxes ||= @migration.account.followers.inboxes
+    @inboxes ||= (@migration.account.followers.inboxes + @migration.account.blocked_by.inboxes).uniq
   end
 
   def signed_payload

app/workers/move_worker.rb

@@ -14,6 +14,8 @@ class MoveWorker
     end
 
     copy_account_notes!
+    carry_blocks_over!
+    carry_mutes_over!
   rescue ActiveRecord::RecordNotFound
     true
   end
@@ -51,4 +53,29 @@ class MoveWorker
       end
     end
   end
+
+  def carry_blocks_over!
+    @source_account.blocked_by_relationships.where(account: Account.local).find_each do |block|
+      unless block.account.blocking?(@target_account) || block.account.following?(@target_account)
+        BlockService.new.call(block.account, @target_account)
+        add_account_note_if_needed!(block.account, 'move_handler.carry_blocks_over_text')
+      end
+    end
+  end
+
+  def carry_mutes_over!
+    @source_account.muted_by_relationships.where(account: Account.local).find_each do |mute|
+      MuteService.new.call(mute.account, @target_account, notifications: mute.hide_notifications) unless mute.account.muting?(@target_account) || mute.account.following?(@target_account)
+      add_account_note_if_needed!(mute.account, 'move_handler.carry_mutes_over_text')
+    end
+  end
+
+  def add_account_note_if_needed!(account, id)
+    unless AccountNote.where(account: account, target_account: @target_account).exists?
+      text = I18n.with_locale(account.user.locale || I18n.default_locale) do
+        I18n.t(id, acct: @source_account.acct)
+      end
+      AccountNote.create!(account: account, target_account: @target_account, comment: text)
+    end
+  end
 end