Add configuration option for registrations.

config/config.exs

@@ -44,7 +44,8 @@
   version: version,
   name: "Pleroma",
   email: "example@example.com",
-  limit: 5000
+  limit: 5000,
+  registrations_open: true
 
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.

lib/pleroma/web/router.ex

@@ -98,6 +98,9 @@ def user_fetcher(username) do
     get "/statusnet/version", TwitterAPI.UtilController, :version
   end
 
+  @instance Application.get_env(:pleroma, :instance)
+  @registrations_open Keyword.get(@instance, :registrations_open)
+
   scope "/api", Pleroma.Web do
     pipe_through :api
 
@@ -110,7 +113,9 @@ def user_fetcher(username) do
     get "/statuses/show/:id", TwitterAPI.Controller, :fetch_status
     get "/statusnet/conversation/:id", TwitterAPI.Controller, :fetch_conversation
 
-    post "/account/register", TwitterAPI.Controller, :register
+    if @registrations_open do
+      post "/account/register", TwitterAPI.Controller, :register
+    end
 
     get "/externalprofile/show", TwitterAPI.Controller, :external_profile
   end

lib/pleroma/web/twitter_api/controllers/util_controller.ex

@@ -16,6 +16,7 @@ def config(conn, _params) do
             <name>#{Keyword.get(@instance, :name)}</name>
             <site>#{Web.base_url}</site>
             <textlimit>#{Keyword.get(@instance, :limit)}</textlimit>
+            <closed>#{!Keyword.get(@instance, :registrations_open)}</closed>
           </site>
         </config>
         """
@@ -27,7 +28,8 @@ def config(conn, _params) do
               site: %{
                 name: Keyword.get(@instance, :name),
                 server: Web.base_url,
-                textlimit: Keyword.get(@instance, :limit)
+                textlimit: Keyword.get(@instance, :limit),
+                closed: if(Keyword.get(@instance, :registrations_open), do: "0", else: "1")
               }
              })
     end