Add nodeinfo

lib/nulla/activitypub.ex

@@ -137,8 +137,7 @@ defmodule Nulla.ActivityPub do
       id: "https://#{domain}/activities/#{activity.id}",
       type: activity.type,
       actor: activity.actor,
-      object: activity.object,
-      to: activity.to
+      object: activity.object
     )
   end
 
@@ -244,6 +243,7 @@ defmodule Nulla.ActivityPub do
     Jason.OrderedObject.new(data)
   end
 
+  @spec webfinger(String.t(), String.t(), String.t()) :: Jason.OrderedObject.t()
   def webfinger(domain, username, resource) do
     Jason.OrderedObject.new(
       subject: resource,
@@ -256,4 +256,52 @@ defmodule Nulla.ActivityPub do
       ]
     )
   end
+
+  @spec nodeinfo(String.t()) :: Jason.OrderedObject.t()
+  def nodeinfo(domain) do
+    Jason.OrderedObject.new(
+      links: [
+        Jason.OrderedObject.new(
+          rel: "http://nodeinfo.diaspora.software/ns/schema/2.0",
+          href: "https://#{domain}/nodeinfo/2.0"
+        )
+      ]
+    )
+  end
+
+  @spec nodeinfo(String.t(), Map.t(), Nulla.Models.InstanceSettings.t()) ::
+          Jason.OrderedObject.t()
+  def nodeinfo(version, users, instance) do
+    Jason.OrderedObject.new(
+      version: "2.0",
+      software:
+        Jason.OrderedObject.new(
+          name: "nulla",
+          version: version
+        ),
+      protocols: [
+        "activitypub"
+      ],
+      services:
+        Jason.OrderedObject.new(
+          outbound: [],
+          inbound: []
+        ),
+      usage:
+        Jason.OrderedObject.new(
+          users:
+            Jason.OrderedObject.new(
+              total: users.total,
+              activeMonth: users.month,
+              activeHalfyear: users.halfyear
+            )
+        ),
+      openRegistrations: instance.registration,
+      metadata:
+        Jason.OrderedObject.new(
+          nodeName: instance.name,
+          nodeDescription: instance.description
+        )
+    )
+  end
 end

lib/nulla_web/controllers/nodeinfo_controller.ex

@@ -0,0 +1,28 @@
+defmodule NullaWeb.NodeinfoController do
+  use NullaWeb, :controller
+  alias Nulla.Repo
+  alias Nulla.ActivityPub
+  alias Nulla.Models.User
+  alias Nulla.Models.InstanceSettings
+
+  def index(conn, _params) do
+    instance_settings = InstanceSettings.get_instance_settings!()
+    domain = instance_settings.domain
+
+    json(conn, ActivityPub.nodeinfo(domain))
+  end
+
+  def show(conn, _params) do
+    version = Application.spec(:nulla, :vsn) |> to_string()
+
+    users = %{
+      total: 0,
+      month: 0,
+      halfyear: 0
+    }
+
+    instance_settings = InstanceSettings.get_instance_settings!()
+
+    json(conn, ActivityPub.nodeinfo(version, users, instance_settings))
+  end
+end

lib/nulla_web/controllers/webfinger_controller.ex

@@ -5,7 +5,7 @@ defmodule NullaWeb.WebfingerController do
   alias Nulla.Models.User
   alias Nulla.Models.InstanceSettings
 
-  def show(conn, %{"resource" => resource}) do
+  def index(conn, %{"resource" => resource}) do
     case Regex.run(~r/^acct:([^@]+)@(.+)$/, resource) do
       [_, username, domain] ->
         case User.get_user_by_username(username) do

lib/nulla_web/router.ex

@@ -11,17 +11,15 @@ defmodule NullaWeb.Router do
   end
 
   pipeline :api do
-    plug :accepts, ["activity+json", "ld+json"]
-
-    post "/inbox", InboxController, :receive
-    post "/@:username/inbox", InboxController, :receive
-    get "/@:username/outbox", OutboxController, :index
+    plug :accepts, ["json"]
   end
 
   scope "/", NullaWeb do
     pipe_through :browser
 
-    get "/.well-known/webfinger", WebfingerController, :show
+    get "/.well-known/webfinger", WebfingerController, :index
+    get "/.well-known/nodeinfo", NodeinfoController, :index
+    get "/nodeinfo/2.0", NodeinfoController, :show
 
     get "/@:username", UserController, :show
     get "/@:username/following", FollowController, :following