From 4e1cc2bab6ec76af1b6de986561a82887d18f366 Mon Sep 17 00:00:00 2001
From: sxsdv1 <sxsdv1@gmail.com>
Date: Tue, 1 Jan 2019 23:19:40 +0100
Subject: [PATCH] Implement delete activity

---
 .../activity_pub/activity_pub_controller.ex   | 10 ++++
 .../activity_pub_controller_test.exs          | 49 ++++++++++++++++++-
 2 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/activity_pub_controller.ex b/lib/pleroma/web/activity_pub/activity_pub_controller.ex
index d23c54933..a3f736fee 100644
--- a/lib/pleroma/web/activity_pub/activity_pub_controller.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub_controller.ex
@@ -181,6 +181,16 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubController do
     })
   end
 
+  def handle_user_activity(user, %{"type" => "Delete"} = params) do
+    with %Object{} = object <- Object.normalize(params["object"]),
+         true <- user.info.is_moderator || user.ap_id == object.data["actor"],
+         {:ok, delete} <- ActivityPub.delete(object) do
+      {:ok, delete}
+    else
+      _ -> {:error, "Can't delete object"}
+    end
+  end
+
   def handle_user_activity(_, _) do
     {:error, "Unhandled activity type"}
   end
diff --git a/test/web/activity_pub/activity_pub_controller_test.exs b/test/web/activity_pub/activity_pub_controller_test.exs
index 77dc96617..620e03674 100644
--- a/test/web/activity_pub/activity_pub_controller_test.exs
+++ b/test/web/activity_pub/activity_pub_controller_test.exs
@@ -6,7 +6,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
   use Pleroma.Web.ConnCase
   import Pleroma.Factory
   alias Pleroma.Web.ActivityPub.{UserView, ObjectView}
-  alias Pleroma.{Repo, User}
+  alias Pleroma.{Object, Repo, User}
   alias Pleroma.Activity
 
   setup_all do
@@ -179,7 +179,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
       assert json_response(conn, 403)
     end
 
-    test "it inserts an incoming activity into the database", %{conn: conn} do
+    test "it inserts an incoming create activity into the database", %{conn: conn} do
       data = File.read!("test/fixtures/activitypub-client-post-activity.json") |> Poison.decode!()
       user = insert(:user)
 
@@ -209,6 +209,51 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
 
       assert json_response(conn, 400)
     end
+
+    test "it erects a tombstone when receiving a delete activity", %{conn: conn} do
+      note_activity = insert(:note_activity)
+      user = User.get_cached_by_ap_id(note_activity.data["actor"])
+
+      data = %{
+        type: "Delete",
+        object: %{
+          id: note_activity.data["object"]["id"]
+        }
+      }
+
+      conn =
+        conn
+        |> assign(:user, user)
+        |> put_req_header("content-type", "application/activity+json")
+        |> post("/users/#{user.nickname}/outbox", data)
+
+      result = json_response(conn, 201)
+      assert Activity.get_by_ap_id(result["id"])
+
+      object = Object.get_by_ap_id(note_activity.data["object"]["id"])
+      assert object
+      assert object.data["type"] == "Tombstone"
+    end
+
+    test "it rejects delete activity of object from other actor", %{conn: conn} do
+      note_activity = insert(:note_activity)
+      user = insert(:user)
+
+      data = %{
+        type: "Delete",
+        object: %{
+          id: note_activity.data["object"]["id"]
+        }
+      }
+
+      conn =
+        conn
+        |> assign(:user, user)
+        |> put_req_header("content-type", "application/activity+json")
+        |> post("/users/#{user.nickname}/outbox", data)
+
+      assert json_response(conn, 400)
+    end
   end
 
   describe "/users/:nickname/followers" do