Merge branch 'reserve-user-names' into 'develop'

Reserve a few user names

See merge request pleroma/pleroma!594

lib/pleroma/user.ex

@@ -197,6 +197,7 @@ defmodule Pleroma.User do
       |> validate_confirmation(:password)
       |> unique_constraint(:email)
       |> unique_constraint(:nickname)
+      |> validate_exclusion(:nickname, Pleroma.Config.get([Pleroma.User, :restricted_nicknames]))
       |> validate_format(:nickname, local_nickname_regex())
       |> validate_format(:email, @email_regex)
       |> validate_length(:bio, max: 1000)

lib/pleroma/web/nodeinfo/nodeinfo_controller.ex

@@ -138,7 +138,8 @@ defmodule Pleroma.Web.Nodeinfo.NodeinfoController do
         },
         accountActivationRequired: Keyword.get(instance, :account_activation_required, false),
         invitesEnabled: Keyword.get(instance, :invites_enabled, false),
-        features: features
+        features: features,
+        restrictedNicknames: Pleroma.Config.get([Pleroma.User, :restricted_nicknames])
       }
     }