qb_akkoma/test/web/activity_pub/transmogrifier_test.exs

defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
  use Pleroma.DataCase
  alias Pleroma.Web.ActivityPub.Transmogrifier
  alias Pleroma.Web.ActivityPub.Utils
  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.OStatus
  alias Pleroma.Activity
  alias Pleroma.User
  alias Pleroma.Repo
  alias Pleroma.Web.Websub.WebsubClientSubscription

  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"])

      {:ok, returned_activity} = Transmogrifier.handle_incoming(data)

      assert activity == returned_activity
    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!()

      object =
        data["object"]
        |> Map.put("inReplyTo", "https://shitposter.club/notice/2827873")

      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 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!()

      {: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["to"] == ["https://www.w3.org/ns/activitystreams#Public"]

      assert data["cc"] == [
               "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"
             ]

      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["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!()

      {: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 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)

      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)

      assert data["actor"] == "http://mastodon.example.org/users/admin"
      assert data["type"] == "Follow"
      assert data["id"] == "http://mastodon.example.org/users/admin#follows/2"
      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"])

      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)

      assert data["actor"] == "http://mastodon.example.org/users/admin"
      assert data["type"] == "Like"
      assert data["id"] == "http://mastodon.example.org/users/admin#likes/2"
      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!()

      {: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"])
    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"])

      {: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"] == activity.data["object"]["id"]

      assert Activity.get_create_activity_by_object_ap_id(data["object"]).id == activity.id
    end

    test "it works for incoming update activities" 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"])

      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.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 =
        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
  end

  describe "prepare outgoing" do
    test "it turns mentions into tags" do
      user = insert(:user)
      other_user = insert(:user)

      {:ok, activity} =
        CommonAPI.post(user, %{"status" => "hey, @#{other_user.nickname}, how are ya? #2hu"})

      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
      object = modified["object"]

      expected_mention = %{
        "href" => other_user.ap_id,
        "name" => "@#{other_user.nickname}",
        "type" => "Mention"
      }

      expected_tag = %{
        "href" => Pleroma.Web.Endpoint.url() <> "/tags/2hu",
        "type" => "Hashtag",
        "name" => "#2hu"
      }

      assert Enum.member?(object["tag"], expected_tag)
      assert Enum.member?(object["tag"], expected_mention)
    end

    test "it adds the sensitive property" do
      user = insert(:user)

      {:ok, activity} = CommonAPI.post(user, %{"status" => "#nsfw hey"})
      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)

      assert modified["object"]["sensitive"]
    end

    test "it adds the json-ld context and the conversation property" do
      user = insert(:user)

      {:ok, activity} = CommonAPI.post(user, %{"status" => "hey"})
      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)

      assert modified["@context"] ==
               Pleroma.Web.ActivityPub.Utils.make_json_ld_header()["@context"]

      assert modified["object"]["conversation"] == modified["context"]
    end

    test "it sets the 'attributedTo' property to the actor of the object if it doesn't have one" do
      user = insert(:user)

      {:ok, activity} = CommonAPI.post(user, %{"status" => "hey"})
      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)

      assert modified["object"]["actor"] == modified["object"]["attributedTo"]
    end

    test "it translates ostatus IDs to external URLs" do
      incoming = File.read!("test/fixtures/incoming_note_activity.xml")
      {:ok, [referent_activity]} = OStatus.handle_incoming(incoming)

      user = insert(:user)

      {:ok, activity, _} = CommonAPI.favorite(referent_activity.id, user)
      {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)

      assert modified["object"] == "http://gs.example.org:4040/index.php/notice/29"
    end

    test "it translates ostatus reply_to IDs to external URLs" do
      incoming = File.read!("test/fixtures/incoming_note_activity.xml")
      {:ok, [referred_activity]} = OStatus.handle_incoming(incoming)

      user = insert(:user)

      {: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"]["likes"])
      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
  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_two = insert(:user, %{following: [user.follower_address]})

      {:ok, activity} = CommonAPI.post(user, %{"status" => "test"})
      {:ok, unrelated_activity} = CommonAPI.post(user_two, %{"status" => "test"})
      assert "http://localhost:4001/users/rye@niu.moe/followers" in activity.recipients

      user = Repo.get(User, user.id)
      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.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

      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

      refute "..." in activity.recipients

      unrelated_activity = Repo.get(Activity, unrelated_activity.id)
      refute user.follower_address in unrelated_activity.recipients

      user_two = Repo.get(User, user_two.id)
      assert user.follower_address in user_two.following
      refute "..." in user_two.following
    end
  end

  describe "maybe_retire_websub" do
    test "it deletes all websub client subscripitions with the user as topic" do
      subscription = %WebsubClientSubscription{topic: "https://niu.moe/users/rye.atom"}
      {:ok, ws} = Repo.insert(subscription)

      subscription = %WebsubClientSubscription{topic: "https://niu.moe/users/pasty.atom"}
      {:ok, ws2} = Repo.insert(subscription)

      Transmogrifier.maybe_retire_websub("https://niu.moe/users/rye")

      refute Repo.get(WebsubClientSubscription, ws.id)
      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
      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"})
        })

      {: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
end