5 files changed, 93 insertions, 20 deletions
diff --git a/lib/pleroma/instances/instance.ex b/lib/pleroma/instances/instance.ex
index 4d0e8034d..2f338b3e2 100644
--- a/lib/pleroma/instances/instance.ex
+++ b/lib/pleroma/instances/instance.ex
@@ -8,6 +8,8 @@ defmodule Pleroma.Instances.Instance do
   alias Pleroma.Instances
   alias Pleroma.Instances.Instance
   alias Pleroma.Repo
+  alias Pleroma.User
+  alias Pleroma.Workers.BackgroundWorker
 
   use Ecto.Schema
 
@@ -195,4 +197,24 @@ defmodule Pleroma.Instances.Instance do
         nil
     end
   end
+
+  @doc """
+  Deletes all users from an instance in a background task, thus also deleting
+  all of those users' activities and notifications.
+  """
+  def delete_users_and_activities(host) when is_binary(host) do
+    BackgroundWorker.enqueue("delete_instance", %{"host" => host})
+  end
+
+  def perform(:delete_instance, host) when is_binary(host) do
+    User.Query.build(%{nickname: "@#{host}"})
+    |> Repo.chunk_stream(100, :batches)
+    |> Stream.each(fn users ->
+      users
+      |> Enum.each(fn user ->
+        User.perform(:delete, user)
+      end)
+    end)
+    |> Stream.run()
+  end
 end
diff --git a/lib/pleroma/web/admin_api/controllers/admin_api_controller.ex b/lib/pleroma/web/admin_api/controllers/admin_api_controller.ex
index 839ac1a8d..50aa294f0 100644
--- a/lib/pleroma/web/admin_api/controllers/admin_api_controller.ex
+++ b/lib/pleroma/web/admin_api/controllers/admin_api_controller.ex
@@ -49,7 +49,7 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
   plug(
     OAuthScopesPlug,
     %{scopes: ["admin:read:statuses"]}
-    when action in [:list_user_statuses, :list_instance_statuses]
+    when action in [:list_user_statuses]
   )
 
   plug(
@@ -81,24 +81,6 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIController do
 
   action_fallback(AdminAPI.FallbackController)
 
-  def list_instance_statuses(conn, %{"instance" => instance} = params) do
-    with_reblogs = params["with_reblogs"] == "true" || params["with_reblogs"] == true
-    {page, page_size} = page_params(params)
-
-    result =
-      ActivityPub.fetch_statuses(nil, %{
-        instance: instance,
-        limit: page_size,
-        offset: (page - 1) * page_size,
-        exclude_reblogs: not with_reblogs,
-        total: true
-      })
-
-    conn
-    |> put_view(AdminAPI.StatusView)
-    |> render("index.json", %{total: result[:total], activities: result[:items], as: :activity})
-  end
-
   def list_user_statuses(%{assigns: %{user: admin}} = conn, %{"nickname" => nickname} = params) do
     with_reblogs = params["with_reblogs"] == "true" || params["with_reblogs"] == true
     godmode = params["godmode"] == "true" || params["godmode"] == true
diff --git a/lib/pleroma/web/admin_api/controllers/instance_controller.ex b/lib/pleroma/web/admin_api/controllers/instance_controller.ex
new file mode 100644
index 000000000..00857983f
--- /dev/null
+++ b/lib/pleroma/web/admin_api/controllers/instance_controller.ex
@@ -0,0 +1,63 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.AdminAPI.InstanceController do
+  use Pleroma.Web, :controller
+
+  import Pleroma.Web.ControllerHelper, only: [fetch_integer_param: 3]
+
+  alias Pleroma.Instances.Instance
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.AdminAPI
+  alias Pleroma.Web.Plugs.OAuthScopesPlug
+
+  require Logger
+
+  @default_page_size 50
+
+  plug(
+    OAuthScopesPlug,
+    %{scopes: ["admin:read:statuses"]}
+    when action in [:list_statuses]
+  )
+
+  plug(
+    OAuthScopesPlug,
+    %{scopes: ["admin:write:accounts", "admin:write:statuses"]}
+    when action in [:delete]
+  )
+
+  action_fallback(AdminAPI.FallbackController)
+
+  def list_statuses(conn, %{"instance" => instance} = params) do
+    with_reblogs = params["with_reblogs"] == "true" || params["with_reblogs"] == true
+    {page, page_size} = page_params(params)
+
+    result =
+      ActivityPub.fetch_statuses(nil, %{
+        instance: instance,
+        limit: page_size,
+        offset: (page - 1) * page_size,
+        exclude_reblogs: not with_reblogs,
+        total: true
+      })
+
+    conn
+    |> put_view(AdminAPI.StatusView)
+    |> render("index.json", %{total: result[:total], activities: result[:items], as: :activity})
+  end
+
+  def delete(conn, %{"instance" => instance}) do
+    with {:ok, _job} <- Instance.delete_users_and_activities(instance) do
+      json(conn, instance)
+    end
+  end
+
+  defp page_params(params) do
+    {
+      fetch_integer_param(params, "page", 1),
+      fetch_integer_param(params, "page_size", @default_page_size)
+    }
+  end
+end
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index 1f84750b9..abb332ec2 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -211,7 +211,8 @@ defmodule Pleroma.Web.Router do
     get("/users/:nickname/statuses", AdminAPIController, :list_user_statuses)
     get("/users/:nickname/chats", AdminAPIController, :list_user_chats)
 
-    get("/instances/:instance/statuses", AdminAPIController, :list_instance_statuses)
+    get("/instances/:instance/statuses", InstanceController, :list_statuses)
+    delete("/instances/:instance", InstanceController, :delete)
 
     get("/instance_document/:name", InstanceDocumentController, :show)
     patch("/instance_document/:name", InstanceDocumentController, :update)
diff --git a/lib/pleroma/workers/background_worker.ex b/lib/pleroma/workers/background_worker.ex
index 1e28384cb..4db077232 100644
--- a/lib/pleroma/workers/background_worker.ex
+++ b/lib/pleroma/workers/background_worker.ex
@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Workers.BackgroundWorker do
+  alias Pleroma.Instances.Instance
   alias Pleroma.User
 
   use Pleroma.Workers.WorkerHelper, queue: "background"
@@ -38,4 +39,8 @@ defmodule Pleroma.Workers.BackgroundWorker do
 
     Pleroma.FollowingRelationship.move_following(origin, target)
   end
+
+  def perform(%Job{args: %{"op" => "delete_instance", "host" => host}}) do
+    Instance.perform(:delete_instance, host)
+  end
 end