Merge branch 'hotfix/delete-activities' into 'develop'
[akkoma] / test / web / activity_pub / transmogrifier_test.exs
index 375e74ad963634d2425fef2e58611c3cdfd7c8e9..8184dbbaebde7c3a8cdb350a9267f776095dc007 100644 (file)
@@ -1,24 +1,34 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
   use Pleroma.DataCase
-  alias Pleroma.Web.ActivityPub.Transmogrifier
-  alias Pleroma.Web.OStatus
   alias Pleroma.Activity
-  alias Pleroma.User
   alias Pleroma.Repo
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+  alias Pleroma.Web.ActivityPub.Utils
+  alias Pleroma.Web.OStatus
   alias Pleroma.Web.Websub.WebsubClientSubscription
-  alias Pleroma.Web.Websub.WebsubServerSubscription
-  import Ecto.Query
 
   import Pleroma.Factory
   alias Pleroma.Web.CommonAPI
 
+  setup_all do
+    Tesla.Mock.mock_global(fn env -> apply(HttpRequestMock, :request, [env]) end)
+    :ok
+  end
+
   describe "handle_incoming" do
     test "it ignores an incoming notice if we already have it" do
       activity = insert(:note_activity)
 
-      data = File.read!("test/fixtures/mastodon-post-activity.json")
-      |> Poison.decode!
-      |> Map.put("object", activity.data["object"])
+      data =
+        File.read!("test/fixtures/mastodon-post-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", activity.data["object"])
 
       {:ok, returned_activity} = Transmogrifier.handle_incoming(data)
 
@@ -26,60 +36,169 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
     end
 
     test "it fetches replied-to activities if we don't have them" do
-      data = File.read!("test/fixtures/mastodon-post-activity.json")
-      |> Poison.decode!
+      data =
+        File.read!("test/fixtures/mastodon-post-activity.json")
+        |> Poison.decode!()
 
-      object = data["object"]
-      |> Map.put("inReplyTo", "https://shitposter.club/notice/2827873")
+      object =
+        data["object"]
+        |> Map.put("inReplyTo", "https://shitposter.club/notice/2827873")
 
-      data = data
-      |> Map.put("object", object)
+      data =
+        data
+        |> Map.put("object", object)
 
       {:ok, returned_activity} = Transmogrifier.handle_incoming(data)
 
-      assert activity = Activity.get_create_activity_by_object_ap_id("tag:shitposter.club,2017-05-05:noticeId=2827873:objectType=comment")
-      assert returned_activity.data["object"]["inReplyToAtomUri"] == "https://shitposter.club/notice/2827873"
+      assert activity =
+               Activity.get_create_by_object_ap_id(
+                 "tag:shitposter.club,2017-05-05:noticeId=2827873:objectType=comment"
+               )
+
+      assert returned_activity.data["object"]["inReplyToAtomUri"] ==
+               "https://shitposter.club/notice/2827873"
+
       assert returned_activity.data["object"]["inReplyToStatusId"] == activity.id
     end
 
     test "it works for incoming notices" do
-      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!
+      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!()
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
-      assert data["id"] == "http://mastodon.example.org/users/admin/statuses/99512778738411822/activity"
-      assert data["context"] == "tag:mastodon.example.org,2018-02-12:objectId=20:objectType=Conversation"
+
+      assert data["id"] ==
+               "http://mastodon.example.org/users/admin/statuses/99512778738411822/activity"
+
+      assert data["context"] ==
+               "tag:mastodon.example.org,2018-02-12:objectId=20:objectType=Conversation"
+
       assert data["to"] == ["https://www.w3.org/ns/activitystreams#Public"]
+
       assert data["cc"] == [
-        "http://mastodon.example.org/users/admin/followers",
-        "http://localtesting.pleroma.lol/users/lain"
-      ]
+               "http://mastodon.example.org/users/admin/followers",
+               "http://localtesting.pleroma.lol/users/lain"
+             ]
+
       assert data["actor"] == "http://mastodon.example.org/users/admin"
 
       object = data["object"]
       assert object["id"] == "http://mastodon.example.org/users/admin/statuses/99512778738411822"
 
       assert object["to"] == ["https://www.w3.org/ns/activitystreams#Public"]
+
       assert object["cc"] == [
-        "http://mastodon.example.org/users/admin/followers",
-        "http://localtesting.pleroma.lol/users/lain"
-      ]
+               "http://mastodon.example.org/users/admin/followers",
+               "http://localtesting.pleroma.lol/users/lain"
+             ]
+
       assert object["actor"] == "http://mastodon.example.org/users/admin"
       assert object["attributedTo"] == "http://mastodon.example.org/users/admin"
-      assert object["context"] == "tag:mastodon.example.org,2018-02-12:objectId=20:objectType=Conversation"
+
+      assert object["context"] ==
+               "tag:mastodon.example.org,2018-02-12:objectId=20:objectType=Conversation"
+
       assert object["sensitive"] == true
+
+      user = User.get_by_ap_id(object["actor"])
+
+      assert user.info.note_count == 1
     end
 
     test "it works for incoming notices with hashtags" do
-      data = File.read!("test/fixtures/mastodon-post-activity-hashtag.json") |> Poison.decode!
+      data = File.read!("test/fixtures/mastodon-post-activity-hashtag.json") |> Poison.decode!()
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
       assert Enum.at(data["object"]["tag"], 2) == "moo"
     end
 
+    test "it works for incoming notices with contentMap" do
+      data =
+        File.read!("test/fixtures/mastodon-post-activity-contentmap.json") |> Poison.decode!()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["object"]["content"] ==
+               "<p><span class=\"h-card\"><a href=\"http://localtesting.pleroma.lol/users/lain\" class=\"u-url mention\">@<span>lain</span></a></span></p>"
+    end
+
+    test "it works for incoming notices with to/cc not being an array (kroeg)" do
+      data = File.read!("test/fixtures/kroeg-post-activity.json") |> Poison.decode!()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["object"]["content"] ==
+               "<p>henlo from my Psion netBook</p><p>message sent from my Psion netBook</p>"
+    end
+
+    test "it works for incoming announces with actor being inlined (kroeg)" do
+      data = File.read!("test/fixtures/kroeg-announce-with-inline-actor.json") |> Poison.decode!()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["actor"] == "https://puckipedia.com/"
+    end
+
+    test "it works for incoming notices with tag not being an array (kroeg)" do
+      data = File.read!("test/fixtures/kroeg-array-less-emoji.json") |> Poison.decode!()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["object"]["emoji"] == %{
+               "icon_e_smile" => "https://puckipedia.com/forum/images/smilies/icon_e_smile.png"
+             }
+
+      data = File.read!("test/fixtures/kroeg-array-less-hashtag.json") |> Poison.decode!()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert "test" in data["object"]["tag"]
+    end
+
+    test "it works for incoming notices with url not being a string (prismo)" do
+      data = File.read!("test/fixtures/prismo-url-map.json") |> Poison.decode!()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["object"]["url"] == "https://prismo.news/posts/83"
+    end
+
+    test "it cleans up incoming notices which are not really DMs" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      to = [user.ap_id, other_user.ap_id]
+
+      data =
+        File.read!("test/fixtures/mastodon-post-activity.json")
+        |> Poison.decode!()
+        |> Map.put("to", to)
+        |> Map.put("cc", [])
+
+      object =
+        data["object"]
+        |> Map.put("to", to)
+        |> Map.put("cc", [])
+
+      data = Map.put(data, "object", object)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["to"] == []
+      assert data["cc"] == to
+
+      object = data["object"]
+
+      assert object["to"] == []
+      assert object["cc"] == to
+    end
+
     test "it works for incoming follow requests" do
       user = insert(:user)
-      data = File.read!("test/fixtures/mastodon-follow-activity.json") |> Poison.decode!
-      |> Map.put("object", user.ap_id)
+
+      data =
+        File.read!("test/fixtures/mastodon-follow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
 
@@ -89,12 +208,31 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       assert User.following?(User.get_by_ap_id(data["actor"]), user)
     end
 
+    test "it works for incoming follow requests from hubzilla" do
+      user = insert(:user)
+
+      data =
+        File.read!("test/fixtures/hubzilla-follow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+        |> Utils.normalize_params()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["actor"] == "https://hubzilla.example.org/channel/kaniini"
+      assert data["type"] == "Follow"
+      assert data["id"] == "https://hubzilla.example.org/channel/kaniini#follows/2"
+      assert User.following?(User.get_by_ap_id(data["actor"]), user)
+    end
+
     test "it works for incoming likes" do
       user = insert(:user)
       {:ok, activity} = CommonAPI.post(user, %{"status" => "hello"})
 
-      data = File.read!("test/fixtures/mastodon-like.json") |> Poison.decode!
-      |> Map.put("object", activity.data["object"]["id"])
+      data =
+        File.read!("test/fixtures/mastodon-like.json")
+        |> Poison.decode!()
+        |> Map.put("object", activity.data["object"]["id"])
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
 
@@ -104,75 +242,528 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       assert data["object"] == activity.data["object"]["id"]
     end
 
+    test "it returns an error for incoming unlikes wihout a like activity" do
+      user = insert(:user)
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "leave a like pls"})
+
+      data =
+        File.read!("test/fixtures/mastodon-undo-like.json")
+        |> Poison.decode!()
+        |> Map.put("object", activity.data["object"]["id"])
+
+      assert Transmogrifier.handle_incoming(data) == :error
+    end
+
+    test "it works for incoming unlikes with an existing like activity" do
+      user = insert(:user)
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "leave a like pls"})
+
+      like_data =
+        File.read!("test/fixtures/mastodon-like.json")
+        |> Poison.decode!()
+        |> Map.put("object", activity.data["object"]["id"])
+
+      {:ok, %Activity{data: like_data, local: false}} = Transmogrifier.handle_incoming(like_data)
+
+      data =
+        File.read!("test/fixtures/mastodon-undo-like.json")
+        |> Poison.decode!()
+        |> Map.put("object", like_data)
+        |> Map.put("actor", like_data["actor"])
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
+      assert data["type"] == "Undo"
+      assert data["id"] == "http://mastodon.example.org/users/admin#likes/2/undo"
+      assert data["object"]["id"] == "http://mastodon.example.org/users/admin#likes/2"
+    end
+
     test "it works for incoming announces" do
-      data = File.read!("test/fixtures/mastodon-announce.json") |> Poison.decode!
+      data = File.read!("test/fixtures/mastodon-announce.json") |> Poison.decode!()
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
 
       assert data["actor"] == "http://mastodon.example.org/users/admin"
       assert data["type"] == "Announce"
-      assert data["id"] == "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
-      assert data["object"] == "http://mastodon.example.org/users/admin/statuses/99541947525187367"
 
-      assert Activity.get_create_activity_by_object_ap_id(data["object"])
+      assert data["id"] ==
+               "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
+
+      assert data["object"] ==
+               "http://mastodon.example.org/users/admin/statuses/99541947525187367"
+
+      assert Activity.get_create_by_object_ap_id(data["object"])
     end
 
     test "it works for incoming announces with an existing activity" do
       user = insert(:user)
       {:ok, activity} = CommonAPI.post(user, %{"status" => "hey"})
 
-      data = File.read!("test/fixtures/mastodon-announce.json")
-      |> Poison.decode!
-      |> Map.put("object", activity.data["object"]["id"])
+      data =
+        File.read!("test/fixtures/mastodon-announce.json")
+        |> Poison.decode!()
+        |> Map.put("object", activity.data["object"]["id"])
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
 
       assert data["actor"] == "http://mastodon.example.org/users/admin"
       assert data["type"] == "Announce"
-      assert data["id"] == "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
+
+      assert data["id"] ==
+               "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
+
       assert data["object"] == activity.data["object"]["id"]
 
-      assert Activity.get_create_activity_by_object_ap_id(data["object"]).id == activity.id
+      assert Activity.get_create_by_object_ap_id(data["object"]).id == activity.id
+    end
+
+    test "it does not clobber the addressing on announce activities" do
+      user = insert(:user)
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "hey"})
+
+      data =
+        File.read!("test/fixtures/mastodon-announce.json")
+        |> Poison.decode!()
+        |> Map.put("object", activity.data["object"]["id"])
+        |> Map.put("to", ["http://mastodon.example.org/users/admin/followers"])
+        |> Map.put("cc", [])
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["to"] == ["http://mastodon.example.org/users/admin/followers"]
     end
 
     test "it works for incoming update activities" do
-      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!
+      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!()
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
-      update_data = File.read!("test/fixtures/mastodon-update.json") |> Poison.decode!
-      object = update_data["object"]
-      |> Map.put("actor", data["actor"])
-      |> Map.put("id", data["actor"])
+      update_data = File.read!("test/fixtures/mastodon-update.json") |> Poison.decode!()
+
+      object =
+        update_data["object"]
+        |> Map.put("actor", data["actor"])
+        |> Map.put("id", data["actor"])
 
-      update_data = update_data
-      |> Map.put("actor", data["actor"])
-      |> Map.put("object", object)
+      update_data =
+        update_data
+        |> Map.put("actor", data["actor"])
+        |> Map.put("object", object)
 
       {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(update_data)
 
       user = User.get_cached_by_ap_id(data["actor"])
       assert user.name == "gargle"
-      assert user.avatar["url"] == [%{"href" => "https://cd.niu.moe/accounts/avatars/000/033/323/original/fd7f8ae0b3ffedc9.jpeg"}]
-      assert user.info["banner"]["url"] == [%{"href" => "https://cd.niu.moe/accounts/headers/000/033/323/original/850b3448fa5fd477.png"}]
+
+      assert user.avatar["url"] == [
+               %{
+                 "href" =>
+                   "https://cd.niu.moe/accounts/avatars/000/033/323/original/fd7f8ae0b3ffedc9.jpeg"
+               }
+             ]
+
+      assert user.info.banner["url"] == [
+               %{
+                 "href" =>
+                   "https://cd.niu.moe/accounts/headers/000/033/323/original/850b3448fa5fd477.png"
+               }
+             ]
+
       assert user.bio == "<p>Some bio</p>"
     end
 
+    test "it works for incoming update activities which lock the account" do
+      data = File.read!("test/fixtures/mastodon-post-activity.json") |> Poison.decode!()
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+      update_data = File.read!("test/fixtures/mastodon-update.json") |> Poison.decode!()
+
+      object =
+        update_data["object"]
+        |> Map.put("actor", data["actor"])
+        |> Map.put("id", data["actor"])
+        |> Map.put("manuallyApprovesFollowers", true)
+
+      update_data =
+        update_data
+        |> Map.put("actor", data["actor"])
+        |> Map.put("object", object)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(update_data)
+
+      user = User.get_cached_by_ap_id(data["actor"])
+      assert user.info.locked == true
+    end
+
     test "it works for incoming deletes" do
       activity = insert(:note_activity)
-      data = File.read!("test/fixtures/mastodon-delete.json")
-      |> Poison.decode!
 
-      object = data["object"]
-      |> Map.put("id", activity.data["object"]["id"])
+      data =
+        File.read!("test/fixtures/mastodon-delete.json")
+        |> Poison.decode!()
 
-      data = data
-      |> Map.put("object", object)
-      |> Map.put("actor", activity.data["actor"])
+      object =
+        data["object"]
+        |> Map.put("id", activity.data["object"]["id"])
 
-      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+      data =
+        data
+        |> Map.put("object", object)
+        |> Map.put("actor", activity.data["actor"])
+
+      {:ok, %Activity{local: false}} = Transmogrifier.handle_incoming(data)
 
       refute Repo.get(Activity, activity.id)
     end
+
+    test "it fails for incoming deletes with spoofed origin" do
+      activity = insert(:note_activity)
+
+      data =
+        File.read!("test/fixtures/mastodon-delete.json")
+        |> Poison.decode!()
+
+      object =
+        data["object"]
+        |> Map.put("id", activity.data["object"]["id"])
+
+      data =
+        data
+        |> Map.put("object", object)
+
+      :error = Transmogrifier.handle_incoming(data)
+
+      assert Repo.get(Activity, activity.id)
+    end
+
+    test "it works for incoming unannounces with an existing notice" do
+      user = insert(:user)
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "hey"})
+
+      announce_data =
+        File.read!("test/fixtures/mastodon-announce.json")
+        |> Poison.decode!()
+        |> Map.put("object", activity.data["object"]["id"])
+
+      {:ok, %Activity{data: announce_data, local: false}} =
+        Transmogrifier.handle_incoming(announce_data)
+
+      data =
+        File.read!("test/fixtures/mastodon-undo-announce.json")
+        |> Poison.decode!()
+        |> Map.put("object", announce_data)
+        |> Map.put("actor", announce_data["actor"])
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["type"] == "Undo"
+      assert data["object"]["type"] == "Announce"
+      assert data["object"]["object"] == activity.data["object"]["id"]
+
+      assert data["object"]["id"] ==
+               "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
+    end
+
+    test "it works for incomming unfollows with an existing follow" do
+      user = insert(:user)
+
+      follow_data =
+        File.read!("test/fixtures/mastodon-follow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+
+      {:ok, %Activity{data: _, local: false}} = Transmogrifier.handle_incoming(follow_data)
+
+      data =
+        File.read!("test/fixtures/mastodon-unfollow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", follow_data)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["type"] == "Undo"
+      assert data["object"]["type"] == "Follow"
+      assert data["object"]["object"] == user.ap_id
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
+
+      refute User.following?(User.get_by_ap_id(data["actor"]), user)
+    end
+
+    test "it works for incoming blocks" do
+      user = insert(:user)
+
+      data =
+        File.read!("test/fixtures/mastodon-block-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["type"] == "Block"
+      assert data["object"] == user.ap_id
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
+
+      blocker = User.get_by_ap_id(data["actor"])
+
+      assert User.blocks?(blocker, user)
+    end
+
+    test "incoming blocks successfully tear down any follow relationship" do
+      blocker = insert(:user)
+      blocked = insert(:user)
+
+      data =
+        File.read!("test/fixtures/mastodon-block-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", blocked.ap_id)
+        |> Map.put("actor", blocker.ap_id)
+
+      {:ok, blocker} = User.follow(blocker, blocked)
+      {:ok, blocked} = User.follow(blocked, blocker)
+
+      assert User.following?(blocker, blocked)
+      assert User.following?(blocked, blocker)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["type"] == "Block"
+      assert data["object"] == blocked.ap_id
+      assert data["actor"] == blocker.ap_id
+
+      blocker = User.get_by_ap_id(data["actor"])
+      blocked = User.get_by_ap_id(data["object"])
+
+      assert User.blocks?(blocker, blocked)
+
+      refute User.following?(blocker, blocked)
+      refute User.following?(blocked, blocker)
+    end
+
+    test "it works for incoming unblocks with an existing block" do
+      user = insert(:user)
+
+      block_data =
+        File.read!("test/fixtures/mastodon-block-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+
+      {:ok, %Activity{data: _, local: false}} = Transmogrifier.handle_incoming(block_data)
+
+      data =
+        File.read!("test/fixtures/mastodon-unblock-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", block_data)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+      assert data["type"] == "Undo"
+      assert data["object"]["type"] == "Block"
+      assert data["object"]["object"] == user.ap_id
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
+
+      blocker = User.get_by_ap_id(data["actor"])
+
+      refute User.blocks?(blocker, user)
+    end
+
+    test "it works for incoming accepts which were pre-accepted" do
+      follower = insert(:user)
+      followed = insert(:user)
+
+      {:ok, follower} = User.follow(follower, followed)
+      assert User.following?(follower, followed) == true
+
+      {:ok, follow_activity} = ActivityPub.follow(follower, followed)
+
+      accept_data =
+        File.read!("test/fixtures/mastodon-accept-activity.json")
+        |> Poison.decode!()
+        |> Map.put("actor", followed.ap_id)
+
+      object =
+        accept_data["object"]
+        |> Map.put("actor", follower.ap_id)
+        |> Map.put("id", follow_activity.data["id"])
+
+      accept_data = Map.put(accept_data, "object", object)
+
+      {:ok, activity} = Transmogrifier.handle_incoming(accept_data)
+      refute activity.local
+
+      assert activity.data["object"] == follow_activity.data["id"]
+
+      follower = Repo.get(User, follower.id)
+
+      assert User.following?(follower, followed) == true
+    end
+
+    test "it works for incoming accepts which were orphaned" do
+      follower = insert(:user)
+      followed = insert(:user, %{info: %User.Info{locked: true}})
+
+      {:ok, follow_activity} = ActivityPub.follow(follower, followed)
+
+      accept_data =
+        File.read!("test/fixtures/mastodon-accept-activity.json")
+        |> Poison.decode!()
+        |> Map.put("actor", followed.ap_id)
+
+      accept_data =
+        Map.put(accept_data, "object", Map.put(accept_data["object"], "actor", follower.ap_id))
+
+      {:ok, activity} = Transmogrifier.handle_incoming(accept_data)
+      assert activity.data["object"] == follow_activity.data["id"]
+
+      follower = Repo.get(User, follower.id)
+
+      assert User.following?(follower, followed) == true
+    end
+
+    test "it works for incoming accepts which are referenced by IRI only" do
+      follower = insert(:user)
+      followed = insert(:user, %{info: %User.Info{locked: true}})
+
+      {:ok, follow_activity} = ActivityPub.follow(follower, followed)
+
+      accept_data =
+        File.read!("test/fixtures/mastodon-accept-activity.json")
+        |> Poison.decode!()
+        |> Map.put("actor", followed.ap_id)
+        |> Map.put("object", follow_activity.data["id"])
+
+      {:ok, activity} = Transmogrifier.handle_incoming(accept_data)
+      assert activity.data["object"] == follow_activity.data["id"]
+
+      follower = Repo.get(User, follower.id)
+
+      assert User.following?(follower, followed) == true
+    end
+
+    test "it fails for incoming accepts which cannot be correlated" do
+      follower = insert(:user)
+      followed = insert(:user, %{info: %User.Info{locked: true}})
+
+      accept_data =
+        File.read!("test/fixtures/mastodon-accept-activity.json")
+        |> Poison.decode!()
+        |> Map.put("actor", followed.ap_id)
+
+      accept_data =
+        Map.put(accept_data, "object", Map.put(accept_data["object"], "actor", follower.ap_id))
+
+      :error = Transmogrifier.handle_incoming(accept_data)
+
+      follower = Repo.get(User, follower.id)
+
+      refute User.following?(follower, followed) == true
+    end
+
+    test "it fails for incoming rejects which cannot be correlated" do
+      follower = insert(:user)
+      followed = insert(:user, %{info: %User.Info{locked: true}})
+
+      accept_data =
+        File.read!("test/fixtures/mastodon-reject-activity.json")
+        |> Poison.decode!()
+        |> Map.put("actor", followed.ap_id)
+
+      accept_data =
+        Map.put(accept_data, "object", Map.put(accept_data["object"], "actor", follower.ap_id))
+
+      :error = Transmogrifier.handle_incoming(accept_data)
+
+      follower = Repo.get(User, follower.id)
+
+      refute User.following?(follower, followed) == true
+    end
+
+    test "it works for incoming rejects which are orphaned" do
+      follower = insert(:user)
+      followed = insert(:user, %{info: %User.Info{locked: true}})
+
+      {:ok, follower} = User.follow(follower, followed)
+      {:ok, _follow_activity} = ActivityPub.follow(follower, followed)
+
+      assert User.following?(follower, followed) == true
+
+      reject_data =
+        File.read!("test/fixtures/mastodon-reject-activity.json")
+        |> Poison.decode!()
+        |> Map.put("actor", followed.ap_id)
+
+      reject_data =
+        Map.put(reject_data, "object", Map.put(reject_data["object"], "actor", follower.ap_id))
+
+      {:ok, activity} = Transmogrifier.handle_incoming(reject_data)
+      refute activity.local
+
+      follower = Repo.get(User, follower.id)
+
+      assert User.following?(follower, followed) == false
+    end
+
+    test "it works for incoming rejects which are referenced by IRI only" do
+      follower = insert(:user)
+      followed = insert(:user, %{info: %User.Info{locked: true}})
+
+      {:ok, follower} = User.follow(follower, followed)
+      {:ok, follow_activity} = ActivityPub.follow(follower, followed)
+
+      assert User.following?(follower, followed) == true
+
+      reject_data =
+        File.read!("test/fixtures/mastodon-reject-activity.json")
+        |> Poison.decode!()
+        |> Map.put("actor", followed.ap_id)
+        |> Map.put("object", follow_activity.data["id"])
+
+      {:ok, %Activity{data: _}} = Transmogrifier.handle_incoming(reject_data)
+
+      follower = Repo.get(User, follower.id)
+
+      assert User.following?(follower, followed) == false
+    end
+
+    test "it rejects activities without a valid ID" do
+      user = insert(:user)
+
+      data =
+        File.read!("test/fixtures/mastodon-follow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+        |> Map.put("id", "")
+
+      :error = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it remaps video URLs as attachments if necessary" do
+      {:ok, object} =
+        ActivityPub.fetch_object_from_id(
+          "https://peertube.moe/videos/watch/df5f464b-be8d-46fb-ad81-2d4c2d1630e3"
+        )
+
+      attachment = %{
+        "type" => "Link",
+        "mediaType" => "video/mp4",
+        "href" =>
+          "https://peertube.moe/static/webseed/df5f464b-be8d-46fb-ad81-2d4c2d1630e3-480.mp4",
+        "mimeType" => "video/mp4",
+        "size" => 5_015_880,
+        "url" => [
+          %{
+            "href" =>
+              "https://peertube.moe/static/webseed/df5f464b-be8d-46fb-ad81-2d4c2d1630e3-480.mp4",
+            "mediaType" => "video/mp4",
+            "type" => "Link"
+          }
+        ],
+        "width" => 480
+      }
+
+      assert object.data["url"] ==
+               "https://peertube.moe/videos/watch/df5f464b-be8d-46fb-ad81-2d4c2d1630e3"
+
+      assert object.data["attachment"] == [attachment]
+    end
   end
 
   describe "prepare outgoing" do
@@ -180,7 +771,8 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       user = insert(:user)
       other_user = insert(:user)
 
-      {:ok, activity} = CommonAPI.post(user, %{"status" => "hey, @#{other_user.nickname}, how are ya? #2hu"})
+      {:ok, activity} =
+        CommonAPI.post(user, %{"status" => "hey, @#{other_user.nickname}, how are ya? #2hu"})
 
       {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
       object = modified["object"]
@@ -192,7 +784,7 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       }
 
       expected_tag = %{
-        "href" => Pleroma.Web.Endpoint.url <> "/tags/2hu",
+        "href" => Pleroma.Web.Endpoint.url() <> "/tags/2hu",
         "type" => "Hashtag",
         "name" => "#2hu"
       }
@@ -216,7 +808,9 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       {:ok, activity} = CommonAPI.post(user, %{"status" => "hey"})
       {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
 
-      assert modified["@context"] == "https://www.w3.org/ns/activitystreams"
+      assert modified["@context"] ==
+               Pleroma.Web.ActivityPub.Utils.make_json_ld_header()["@context"]
+
       assert modified["object"]["conversation"] == modified["context"]
     end
 
@@ -247,16 +841,107 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
 
       user = insert(:user)
 
-      {:ok, activity} = CommonAPI.post(user, %{"status" => "HI!", "in_reply_to_status_id" => referred_activity.id})
+      {:ok, activity} =
+        CommonAPI.post(user, %{"status" => "HI!", "in_reply_to_status_id" => referred_activity.id})
+
       {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
 
       assert modified["object"]["inReplyTo"] == "http://gs.example.org:4040/index.php/notice/29"
     end
+
+    test "it strips internal hashtag data" do
+      user = insert(:user)
+
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "#2hu"})
+
+      expected_tag = %{
+        "href" => Pleroma.Web.Endpoint.url() <> "/tags/2hu",
+        "type" => "Hashtag",
+        "name" => "#2hu"
+      }
+
+      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
+
+      assert modified["object"]["tag"] == [expected_tag]
+    end
+
+    test "it strips internal fields" do
+      user = insert(:user)
+
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "#2hu :moominmamma:"})
+
+      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
+
+      assert length(modified["object"]["tag"]) == 2
+
+      assert is_nil(modified["object"]["emoji"])
+      assert is_nil(modified["object"]["like_count"])
+      assert is_nil(modified["object"]["announcements"])
+      assert is_nil(modified["object"]["announcement_count"])
+      assert is_nil(modified["object"]["context_id"])
+    end
+
+    test "it strips internal fields of article" do
+      activity = insert(:article_activity)
+
+      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
+
+      assert length(modified["object"]["tag"]) == 2
+
+      assert is_nil(modified["object"]["emoji"])
+      assert is_nil(modified["object"]["like_count"])
+      assert is_nil(modified["object"]["announcements"])
+      assert is_nil(modified["object"]["announcement_count"])
+      assert is_nil(modified["object"]["context_id"])
+    end
+
+    test "it adds like collection to object" do
+      activity = insert(:note_activity)
+      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
+
+      assert modified["object"]["likes"]["type"] == "OrderedCollection"
+      assert modified["object"]["likes"]["totalItems"] == 0
+    end
+
+    test "the directMessage flag is present" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, activity} = CommonAPI.post(user, %{"status" => "2hu :moominmamma:"})
+
+      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
+
+      assert modified["directMessage"] == false
+
+      {:ok, activity} =
+        CommonAPI.post(user, %{"status" => "@#{other_user.nickname} :moominmamma:"})
+
+      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
+
+      assert modified["directMessage"] == false
+
+      {:ok, activity} =
+        CommonAPI.post(user, %{
+          "status" => "@#{other_user.nickname} :moominmamma:",
+          "visibility" => "direct"
+        })
+
+      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
+
+      assert modified["directMessage"] == true
+    end
   end
 
   describe "user upgrade" do
     test "it upgrades a user to activitypub" do
-      user = insert(:user, %{nickname: "rye@niu.moe", local: false, ap_id: "https://niu.moe/users/rye", follower_address: User.ap_followers(%User{nickname: "rye@niu.moe"})})
+      user =
+        insert(:user, %{
+          nickname: "rye@niu.moe",
+          local: false,
+          ap_id: "https://niu.moe/users/rye",
+          follower_address: User.ap_followers(%User{nickname: "rye@niu.moe"})
+        })
+
       user_two = insert(:user, %{following: [user.follower_address]})
 
       {:ok, activity} = CommonAPI.post(user, %{"status" => "test"})
@@ -264,23 +949,40 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       assert "http://localhost:4001/users/rye@niu.moe/followers" in activity.recipients
 
       user = Repo.get(User, user.id)
-      assert user.info["note_count"] == 1
+      assert user.info.note_count == 1
 
       {:ok, user} = Transmogrifier.upgrade_user_from_ap_id("https://niu.moe/users/rye")
-      assert user.info["ap_enabled"]
-      assert user.info["note_count"] == 1
+      assert user.info.ap_enabled
+      assert user.info.note_count == 1
       assert user.follower_address == "https://niu.moe/users/rye/followers"
 
       # Wait for the background task
       :timer.sleep(1000)
 
       user = Repo.get(User, user.id)
-      assert user.info["note_count"] == 1
+      assert user.info.note_count == 1
 
       activity = Repo.get(Activity, activity.id)
       assert user.follower_address in activity.recipients
-      assert %{"url" => [%{"href" => "https://cdn.niu.moe/accounts/avatars/000/033/323/original/fd7f8ae0b3ffedc9.jpeg"}]} = user.avatar
-      assert %{"url" => [%{"href" => "https://cdn.niu.moe/accounts/headers/000/033/323/original/850b3448fa5fd477.png"}]} = user.info["banner"]
+
+      assert %{
+               "url" => [
+                 %{
+                   "href" =>
+                     "https://cdn.niu.moe/accounts/avatars/000/033/323/original/fd7f8ae0b3ffedc9.jpeg"
+                 }
+               ]
+             } = user.avatar
+
+      assert %{
+               "url" => [
+                 %{
+                   "href" =>
+                     "https://cdn.niu.moe/accounts/headers/000/033/323/original/850b3448fa5fd477.png"
+                 }
+               ]
+             } = user.info.banner
+
       refute "..." in activity.recipients
 
       unrelated_activity = Repo.get(Activity, unrelated_activity.id)
@@ -306,4 +1008,178 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       assert Repo.get(WebsubClientSubscription, ws2.id)
     end
   end
+
+  describe "actor rewriting" do
+    test "it fixes the actor URL property to be a proper URI" do
+      data = %{
+        "url" => %{"href" => "http://example.com"}
+      }
+
+      rewritten = Transmogrifier.maybe_fix_user_object(data)
+      assert rewritten["url"] == "http://example.com"
+    end
+  end
+
+  describe "actor origin containment" do
+    test "it rejects objects with a bogus origin" do
+      {:error, _} = ActivityPub.fetch_object_from_id("https://info.pleroma.site/activity.json")
+    end
+
+    test "it rejects activities which reference objects with bogus origins" do
+      data = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "id" => "http://mastodon.example.org/users/admin/activities/1234",
+        "actor" => "http://mastodon.example.org/users/admin",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => "https://info.pleroma.site/activity.json",
+        "type" => "Announce"
+      }
+
+      :error = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it rejects objects when attributedTo is wrong (variant 1)" do
+      {:error, _} = ActivityPub.fetch_object_from_id("https://info.pleroma.site/activity2.json")
+    end
+
+    test "it rejects activities which reference objects that have an incorrect attribution (variant 1)" do
+      data = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "id" => "http://mastodon.example.org/users/admin/activities/1234",
+        "actor" => "http://mastodon.example.org/users/admin",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => "https://info.pleroma.site/activity2.json",
+        "type" => "Announce"
+      }
+
+      :error = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it rejects objects when attributedTo is wrong (variant 2)" do
+      {:error, _} = ActivityPub.fetch_object_from_id("https://info.pleroma.site/activity3.json")
+    end
+
+    test "it rejects activities which reference objects that have an incorrect attribution (variant 2)" do
+      data = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "id" => "http://mastodon.example.org/users/admin/activities/1234",
+        "actor" => "http://mastodon.example.org/users/admin",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => "https://info.pleroma.site/activity3.json",
+        "type" => "Announce"
+      }
+
+      :error = Transmogrifier.handle_incoming(data)
+    end
+  end
+
+  describe "general origin containment" do
+    test "contain_origin_from_id() catches obvious spoofing attempts" do
+      data = %{
+        "id" => "http://example.com/~alyssa/activities/1234.json"
+      }
+
+      :error =
+        Transmogrifier.contain_origin_from_id(
+          "http://example.org/~alyssa/activities/1234.json",
+          data
+        )
+    end
+
+    test "contain_origin_from_id() allows alternate IDs within the same origin domain" do
+      data = %{
+        "id" => "http://example.com/~alyssa/activities/1234.json"
+      }
+
+      :ok =
+        Transmogrifier.contain_origin_from_id(
+          "http://example.com/~alyssa/activities/1234",
+          data
+        )
+    end
+
+    test "contain_origin_from_id() allows matching IDs" do
+      data = %{
+        "id" => "http://example.com/~alyssa/activities/1234.json"
+      }
+
+      :ok =
+        Transmogrifier.contain_origin_from_id(
+          "http://example.com/~alyssa/activities/1234.json",
+          data
+        )
+    end
+
+    test "users cannot be collided through fake direction spoofing attempts" do
+      insert(:user, %{
+        nickname: "rye@niu.moe",
+        local: false,
+        ap_id: "https://niu.moe/users/rye",
+        follower_address: User.ap_followers(%User{nickname: "rye@niu.moe"})
+      })
+
+      {:error, _} = User.get_or_fetch_by_ap_id("https://n1u.moe/users/rye")
+    end
+
+    test "all objects with fake directions are rejected by the object fetcher" do
+      {:error, _} =
+        ActivityPub.fetch_and_contain_remote_object_from_id(
+          "https://info.pleroma.site/activity4.json"
+        )
+    end
+  end
+
+  describe "reserialization" do
+    test "successfully reserializes a message with inReplyTo == nil" do
+      user = insert(:user)
+
+      message = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "cc" => [],
+        "type" => "Create",
+        "object" => %{
+          "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+          "cc" => [],
+          "type" => "Note",
+          "content" => "Hi",
+          "inReplyTo" => nil,
+          "attributedTo" => user.ap_id
+        },
+        "actor" => user.ap_id
+      }
+
+      {:ok, activity} = Transmogrifier.handle_incoming(message)
+
+      {:ok, _} = Transmogrifier.prepare_outgoing(activity.data)
+    end
+
+    test "successfully reserializes a message with AS2 objects in IR" do
+      user = insert(:user)
+
+      message = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "cc" => [],
+        "type" => "Create",
+        "object" => %{
+          "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+          "cc" => [],
+          "type" => "Note",
+          "content" => "Hi",
+          "inReplyTo" => nil,
+          "attributedTo" => user.ap_id,
+          "tag" => [
+            %{"name" => "#2hu", "href" => "http://example.com/2hu", "type" => "Hashtag"},
+            %{"name" => "Bob", "href" => "http://example.com/bob", "type" => "Mention"}
+          ]
+        },
+        "actor" => user.ap_id
+      }
+
+      {:ok, activity} = Transmogrifier.handle_incoming(message)
+
+      {:ok, _} = Transmogrifier.prepare_outgoing(activity.data)
+    end
+  end
 end