Merge branch 'email-stub-in-verify-credentials' into 'develop'

Email-like field in /api/v1/accounts/verify_credentials (for PeerTube OAuth plugin and alike)

See merge request pleroma/pleroma!3286

lib/pleroma/user.ex

@@ -2031,6 +2031,15 @@ defmodule Pleroma.User do
     |> hd()
   end
 
+  def full_nickname(%User{} = user) do
+    if String.contains?(user.nickname, "@") do
+      user.nickname
+    else
+      %{host: host} = URI.parse(user.ap_id)
+      user.nickname <> "@" <> host
+    end
+  end
+
   def full_nickname(nickname_or_mention),
     do: String.trim_leading(nickname_or_mention, "@")