honkoma/test/web/activity_pub/activity_pub_test.exs

# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
  use Pleroma.DataCase
  use Oban.Testing, repo: Pleroma.Repo

  alias Pleroma.Activity
  alias Pleroma.Builders.ActivityBuilder
  alias Pleroma.Config
  alias Pleroma.Notification
  alias Pleroma.Object
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.ActivityPub.Utils
  alias Pleroma.Web.AdminAPI.AccountView
  alias Pleroma.Web.CommonAPI
  alias Pleroma.Web.Federator

  import Pleroma.Factory
  import Tesla.Mock
  import Mock

  setup do
    mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
    :ok
  end

  setup do: clear_config([:instance, :federating])

  describe "streaming out participations" do
    test "it streams them out" do
      user = insert(:user)
      {:ok, activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "direct"})

      {:ok, conversation} = Pleroma.Conversation.create_or_bump_for(activity)

      participations =
        conversation.participations
        |> Repo.preload(:user)

      with_mock Pleroma.Web.Streamer,
        stream: fn _, _ -> nil end do
        ActivityPub.stream_out_participations(conversation.participations)

        assert called(Pleroma.Web.Streamer.stream("participation", participations))
      end
    end

    test "streams them out on activity creation" do
      user_one = insert(:user)
      user_two = insert(:user)

      with_mock Pleroma.Web.Streamer,
        stream: fn _, _ -> nil end do
        {:ok, activity} =
          CommonAPI.post(user_one, %{
            "status" => "@#{user_two.nickname}",
            "visibility" => "direct"
          })

        conversation =
          activity.data["context"]
          |> Pleroma.Conversation.get_for_ap_id()
          |> Repo.preload(participations: :user)

        assert called(Pleroma.Web.Streamer.stream("participation", conversation.participations))
      end
    end
  end

  describe "fetching restricted by visibility" do
    test "it restricts by the appropriate visibility" do
      user = insert(:user)

      {:ok, public_activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "public"})

      {:ok, direct_activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "direct"})

      {:ok, unlisted_activity} =
        CommonAPI.post(user, %{"status" => ".", "visibility" => "unlisted"})

      {:ok, private_activity} =
        CommonAPI.post(user, %{"status" => ".", "visibility" => "private"})

      activities =
        ActivityPub.fetch_activities([], %{:visibility => "direct", "actor_id" => user.ap_id})

      assert activities == [direct_activity]

      activities =
        ActivityPub.fetch_activities([], %{:visibility => "unlisted", "actor_id" => user.ap_id})

      assert activities == [unlisted_activity]

      activities =
        ActivityPub.fetch_activities([], %{:visibility => "private", "actor_id" => user.ap_id})

      assert activities == [private_activity]

      activities =
        ActivityPub.fetch_activities([], %{:visibility => "public", "actor_id" => user.ap_id})

      assert activities == [public_activity]

      activities =
        ActivityPub.fetch_activities([], %{
          :visibility => ~w[private public],
          "actor_id" => user.ap_id
        })

      assert activities == [public_activity, private_activity]
    end
  end

  describe "fetching excluded by visibility" do
    test "it excludes by the appropriate visibility" do
      user = insert(:user)

      {:ok, public_activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "public"})

      {:ok, direct_activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "direct"})

      {:ok, unlisted_activity} =
        CommonAPI.post(user, %{"status" => ".", "visibility" => "unlisted"})

      {:ok, private_activity} =
        CommonAPI.post(user, %{"status" => ".", "visibility" => "private"})

      activities =
        ActivityPub.fetch_activities([], %{
          "exclude_visibilities" => "direct",
          "actor_id" => user.ap_id
        })

      assert public_activity in activities
      assert unlisted_activity in activities
      assert private_activity in activities
      refute direct_activity in activities

      activities =
        ActivityPub.fetch_activities([], %{
          "exclude_visibilities" => "unlisted",
          "actor_id" => user.ap_id
        })

      assert public_activity in activities
      refute unlisted_activity in activities
      assert private_activity in activities
      assert direct_activity in activities

      activities =
        ActivityPub.fetch_activities([], %{
          "exclude_visibilities" => "private",
          "actor_id" => user.ap_id
        })

      assert public_activity in activities
      assert unlisted_activity in activities
      refute private_activity in activities
      assert direct_activity in activities

      activities =
        ActivityPub.fetch_activities([], %{
          "exclude_visibilities" => "public",
          "actor_id" => user.ap_id
        })

      refute public_activity in activities
      assert unlisted_activity in activities
      assert private_activity in activities
      assert direct_activity in activities
    end
  end

  describe "building a user from his ap id" do
    test "it returns a user" do
      user_id = "http://mastodon.example.org/users/admin"
      {:ok, user} = ActivityPub.make_user_from_ap_id(user_id)
      assert user.ap_id == user_id
      assert user.nickname == "admin@mastodon.example.org"
      assert user.source_data
      assert user.ap_enabled
      assert user.follower_address == "http://mastodon.example.org/users/admin/followers"
    end

    test "it returns a user that is invisible" do
      user_id = "http://mastodon.example.org/users/relay"
      {:ok, user} = ActivityPub.make_user_from_ap_id(user_id)
      assert User.invisible?(user)
    end

    test "it fetches the appropriate tag-restricted posts" do
      user = insert(:user)

      {:ok, status_one} = CommonAPI.post(user, %{"status" => ". #test"})
      {:ok, status_two} = CommonAPI.post(user, %{"status" => ". #essais"})
      {:ok, status_three} = CommonAPI.post(user, %{"status" => ". #test #reject"})

      fetch_one = ActivityPub.fetch_activities([], %{"type" => "Create", "tag" => "test"})

      fetch_two =
        ActivityPub.fetch_activities([], %{"type" => "Create", "tag" => ["test", "essais"]})

      fetch_three =
        ActivityPub.fetch_activities([], %{
          "type" => "Create",
          "tag" => ["test", "essais"],
          "tag_reject" => ["reject"]
        })

      fetch_four =
        ActivityPub.fetch_activities([], %{
          "type" => "Create",
          "tag" => ["test"],
          "tag_all" => ["test", "reject"]
        })

      assert fetch_one == [status_one, status_three]
      assert fetch_two == [status_one, status_two, status_three]
      assert fetch_three == [status_one, status_two]
      assert fetch_four == [status_three]
    end
  end

  describe "insertion" do
    test "drops activities beyond a certain limit" do
      limit = Config.get([:instance, :remote_limit])

      random_text =
        :crypto.strong_rand_bytes(limit + 1)
        |> Base.encode64()
        |> binary_part(0, limit + 1)

      data = %{
        "ok" => true,
        "object" => %{
          "content" => random_text
        }
      }

      assert {:error, {:remote_limit_error, _}} = ActivityPub.insert(data)
    end

    test "doesn't drop activities with content being null" do
      user = insert(:user)

      data = %{
        "actor" => user.ap_id,
        "to" => [],
        "object" => %{
          "actor" => user.ap_id,
          "to" => [],
          "type" => "Note",
          "content" => nil
        }
      }

      assert {:ok, _} = ActivityPub.insert(data)
    end

    test "returns the activity if one with the same id is already in" do
      activity = insert(:note_activity)
      {:ok, new_activity} = ActivityPub.insert(activity.data)

      assert activity.id == new_activity.id
    end

    test "inserts a given map into the activity database, giving it an id if it has none." do
      user = insert(:user)

      data = %{
        "actor" => user.ap_id,
        "to" => [],
        "object" => %{
          "actor" => user.ap_id,
          "to" => [],
          "type" => "Note",
          "content" => "hey"
        }
      }

      {:ok, %Activity{} = activity} = ActivityPub.insert(data)
      assert activity.data["ok"] == data["ok"]
      assert is_binary(activity.data["id"])

      given_id = "bla"

      data = %{
        "id" => given_id,
        "actor" => user.ap_id,
        "to" => [],
        "context" => "blabla",
        "object" => %{
          "actor" => user.ap_id,
          "to" => [],
          "type" => "Note",
          "content" => "hey"
        }
      }

      {:ok, %Activity{} = activity} = ActivityPub.insert(data)
      assert activity.data["ok"] == data["ok"]
      assert activity.data["id"] == given_id
      assert activity.data["context"] == "blabla"
      assert activity.data["context_id"]
    end

    test "adds a context when none is there" do
      user = insert(:user)

      data = %{
        "actor" => user.ap_id,
        "to" => [],
        "object" => %{
          "actor" => user.ap_id,
          "to" => [],
          "type" => "Note",
          "content" => "hey"
        }
      }

      {:ok, %Activity{} = activity} = ActivityPub.insert(data)
      object = Pleroma.Object.normalize(activity)

      assert is_binary(activity.data["context"])
      assert is_binary(object.data["context"])
      assert activity.data["context_id"]
      assert object.data["context_id"]
    end

    test "adds an id to a given object if it lacks one and is a note and inserts it to the object database" do
      user = insert(:user)

      data = %{
        "actor" => user.ap_id,
        "to" => [],
        "object" => %{
          "actor" => user.ap_id,
          "to" => [],
          "type" => "Note",
          "content" => "hey"
        }
      }

      {:ok, %Activity{} = activity} = ActivityPub.insert(data)
      assert object = Object.normalize(activity)
      assert is_binary(object.data["id"])
    end
  end

  describe "listen activities" do
    test "does not increase user note count" do
      user = insert(:user)

      {:ok, activity} =
        ActivityPub.listen(%{
          to: ["https://www.w3.org/ns/activitystreams#Public"],
          actor: user,
          context: "",
          object: %{
            "actor" => user.ap_id,
            "to" => ["https://www.w3.org/ns/activitystreams#Public"],
            "artist" => "lain",
            "title" => "lain radio episode 1",
            "length" => 180_000,
            "type" => "Audio"
          }
        })

      assert activity.actor == user.ap_id

      user = User.get_cached_by_id(user.id)
      assert user.note_count == 0
    end

    test "can be fetched into a timeline" do
      _listen_activity_1 = insert(:listen)
      _listen_activity_2 = insert(:listen)
      _listen_activity_3 = insert(:listen)

      timeline = ActivityPub.fetch_activities([], %{"type" => ["Listen"]})

      assert length(timeline) == 3
    end
  end

  describe "create activities" do
    test "it reverts create" do
      user = insert(:user)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} =
                 ActivityPub.create(%{
                   to: ["user1", "user2"],
                   actor: user,
                   context: "",
                   object: %{
                     "to" => ["user1", "user2"],
                     "type" => "Note",
                     "content" => "testing"
                   }
                 })
      end

      assert Repo.aggregate(Activity, :count, :id) == 0
      assert Repo.aggregate(Object, :count, :id) == 0
    end

    test "removes doubled 'to' recipients" do
      user = insert(:user)

      {:ok, activity} =
        ActivityPub.create(%{
          to: ["user1", "user1", "user2"],
          actor: user,
          context: "",
          object: %{
            "to" => ["user1", "user1", "user2"],
            "type" => "Note",
            "content" => "testing"
          }
        })

      assert activity.data["to"] == ["user1", "user2"]
      assert activity.actor == user.ap_id
      assert activity.recipients == ["user1", "user2", user.ap_id]
    end

    test "increases user note count only for public activities" do
      user = insert(:user)

      {:ok, _} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "1",
          "visibility" => "public"
        })

      {:ok, _} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "2",
          "visibility" => "unlisted"
        })

      {:ok, _} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "2",
          "visibility" => "private"
        })

      {:ok, _} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "3",
          "visibility" => "direct"
        })

      user = User.get_cached_by_id(user.id)
      assert user.note_count == 2
    end

    test "increases replies count" do
      user = insert(:user)
      user2 = insert(:user)

      {:ok, activity} = CommonAPI.post(user, %{"status" => "1", "visibility" => "public"})
      ap_id = activity.data["id"]
      reply_data = %{"status" => "1", "in_reply_to_status_id" => activity.id}

      # public
      {:ok, _} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "public"))
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 1

      # unlisted
      {:ok, _} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "unlisted"))
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 2

      # private
      {:ok, _} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "private"))
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 2

      # direct
      {:ok, _} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "direct"))
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 2
    end
  end

  describe "fetch activities for recipients" do
    test "retrieve the activities for certain recipients" do
      {:ok, activity_one} = ActivityBuilder.insert(%{"to" => ["someone"]})
      {:ok, activity_two} = ActivityBuilder.insert(%{"to" => ["someone_else"]})
      {:ok, _activity_three} = ActivityBuilder.insert(%{"to" => ["noone"]})

      activities = ActivityPub.fetch_activities(["someone", "someone_else"])
      assert length(activities) == 2
      assert activities == [activity_one, activity_two]
    end
  end

  describe "fetch activities in context" do
    test "retrieves activities that have a given context" do
      {:ok, activity} = ActivityBuilder.insert(%{"type" => "Create", "context" => "2hu"})
      {:ok, activity_two} = ActivityBuilder.insert(%{"type" => "Create", "context" => "2hu"})
      {:ok, _activity_three} = ActivityBuilder.insert(%{"type" => "Create", "context" => "3hu"})
      {:ok, _activity_four} = ActivityBuilder.insert(%{"type" => "Announce", "context" => "2hu"})
      activity_five = insert(:note_activity)
      user = insert(:user)

      {:ok, _user_relationship} = User.block(user, %{ap_id: activity_five.data["actor"]})

      activities = ActivityPub.fetch_activities_for_context("2hu", %{"blocking_user" => user})
      assert activities == [activity_two, activity]
    end
  end

  test "doesn't return blocked activities" do
    activity_one = insert(:note_activity)
    activity_two = insert(:note_activity)
    activity_three = insert(:note_activity)
    user = insert(:user)
    booster = insert(:user)
    {:ok, _user_relationship} = User.block(user, %{ap_id: activity_one.data["actor"]})

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => user, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    assert Enum.member?(activities, activity_three)
    refute Enum.member?(activities, activity_one)

    {:ok, _user_block} = User.unblock(user, %{ap_id: activity_one.data["actor"]})

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => user, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    assert Enum.member?(activities, activity_three)
    assert Enum.member?(activities, activity_one)

    {:ok, _user_relationship} = User.block(user, %{ap_id: activity_three.data["actor"]})
    {:ok, _announce, %{data: %{"id" => id}}} = CommonAPI.repeat(activity_three.id, booster)
    %Activity{} = boost_activity = Activity.get_create_by_object_ap_id(id)
    activity_three = Activity.get_by_id(activity_three.id)

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => user, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    refute Enum.member?(activities, activity_three)
    refute Enum.member?(activities, boost_activity)
    assert Enum.member?(activities, activity_one)

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => nil, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    assert Enum.member?(activities, activity_three)
    assert Enum.member?(activities, boost_activity)
    assert Enum.member?(activities, activity_one)
  end

  test "doesn't return transitive interactions concerning blocked users" do
    blocker = insert(:user)
    blockee = insert(:user)
    friend = insert(:user)

    {:ok, _user_relationship} = User.block(blocker, blockee)

    {:ok, activity_one} = CommonAPI.post(friend, %{"status" => "hey!"})

    {:ok, activity_two} = CommonAPI.post(friend, %{"status" => "hey! @#{blockee.nickname}"})

    {:ok, activity_three} = CommonAPI.post(blockee, %{"status" => "hey! @#{friend.nickname}"})

    {:ok, activity_four} = CommonAPI.post(blockee, %{"status" => "hey! @#{blocker.nickname}"})

    activities = ActivityPub.fetch_activities([], %{"blocking_user" => blocker})

    assert Enum.member?(activities, activity_one)
    refute Enum.member?(activities, activity_two)
    refute Enum.member?(activities, activity_three)
    refute Enum.member?(activities, activity_four)
  end

  test "doesn't return announce activities concerning blocked users" do
    blocker = insert(:user)
    blockee = insert(:user)
    friend = insert(:user)

    {:ok, _user_relationship} = User.block(blocker, blockee)

    {:ok, activity_one} = CommonAPI.post(friend, %{"status" => "hey!"})

    {:ok, activity_two} = CommonAPI.post(blockee, %{"status" => "hey! @#{friend.nickname}"})

    {:ok, activity_three, _} = CommonAPI.repeat(activity_two.id, friend)

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => blocker})
      |> Enum.map(fn act -> act.id end)

    assert Enum.member?(activities, activity_one.id)
    refute Enum.member?(activities, activity_two.id)
    refute Enum.member?(activities, activity_three.id)
  end

  test "doesn't return activities from blocked domains" do
    domain = "dogwhistle.zone"
    domain_user = insert(:user, %{ap_id: "https://#{domain}/@pundit"})
    note = insert(:note, %{data: %{"actor" => domain_user.ap_id}})
    activity = insert(:note_activity, %{note: note})
    user = insert(:user)
    {:ok, user} = User.block_domain(user, domain)

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => user, "skip_preload" => true})

    refute activity in activities

    followed_user = insert(:user)
    ActivityPub.follow(user, followed_user)
    {:ok, repeat_activity, _} = CommonAPI.repeat(activity.id, followed_user)

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => user, "skip_preload" => true})

    refute repeat_activity in activities
  end

  test "does return activities from followed users on blocked domains" do
    domain = "meanies.social"
    domain_user = insert(:user, %{ap_id: "https://#{domain}/@pundit"})
    blocker = insert(:user)

    {:ok, blocker} = User.follow(blocker, domain_user)
    {:ok, blocker} = User.block_domain(blocker, domain)

    assert User.following?(blocker, domain_user)
    assert User.blocks_domain?(blocker, domain_user)
    refute User.blocks?(blocker, domain_user)

    note = insert(:note, %{data: %{"actor" => domain_user.ap_id}})
    activity = insert(:note_activity, %{note: note})

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => blocker, "skip_preload" => true})

    assert activity in activities

    # And check that if the guy we DO follow boosts someone else from their domain,
    # that should be hidden
    another_user = insert(:user, %{ap_id: "https://#{domain}/@meanie2"})
    bad_note = insert(:note, %{data: %{"actor" => another_user.ap_id}})
    bad_activity = insert(:note_activity, %{note: bad_note})
    {:ok, repeat_activity, _} = CommonAPI.repeat(bad_activity.id, domain_user)

    activities =
      ActivityPub.fetch_activities([], %{"blocking_user" => blocker, "skip_preload" => true})

    refute repeat_activity in activities
  end

  test "doesn't return muted activities" do
    activity_one = insert(:note_activity)
    activity_two = insert(:note_activity)
    activity_three = insert(:note_activity)
    user = insert(:user)
    booster = insert(:user)

    activity_one_actor = User.get_by_ap_id(activity_one.data["actor"])
    {:ok, _user_relationships} = User.mute(user, activity_one_actor)

    activities =
      ActivityPub.fetch_activities([], %{"muting_user" => user, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    assert Enum.member?(activities, activity_three)
    refute Enum.member?(activities, activity_one)

    # Calling with 'with_muted' will deliver muted activities, too.
    activities =
      ActivityPub.fetch_activities([], %{
        "muting_user" => user,
        "with_muted" => true,
        "skip_preload" => true
      })

    assert Enum.member?(activities, activity_two)
    assert Enum.member?(activities, activity_three)
    assert Enum.member?(activities, activity_one)

    {:ok, _user_mute} = User.unmute(user, activity_one_actor)

    activities =
      ActivityPub.fetch_activities([], %{"muting_user" => user, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    assert Enum.member?(activities, activity_three)
    assert Enum.member?(activities, activity_one)

    activity_three_actor = User.get_by_ap_id(activity_three.data["actor"])
    {:ok, _user_relationships} = User.mute(user, activity_three_actor)
    {:ok, _announce, %{data: %{"id" => id}}} = CommonAPI.repeat(activity_three.id, booster)
    %Activity{} = boost_activity = Activity.get_create_by_object_ap_id(id)
    activity_three = Activity.get_by_id(activity_three.id)

    activities =
      ActivityPub.fetch_activities([], %{"muting_user" => user, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    refute Enum.member?(activities, activity_three)
    refute Enum.member?(activities, boost_activity)
    assert Enum.member?(activities, activity_one)

    activities = ActivityPub.fetch_activities([], %{"muting_user" => nil, "skip_preload" => true})

    assert Enum.member?(activities, activity_two)
    assert Enum.member?(activities, activity_three)
    assert Enum.member?(activities, boost_activity)
    assert Enum.member?(activities, activity_one)
  end

  test "doesn't return thread muted activities" do
    user = insert(:user)
    _activity_one = insert(:note_activity)
    note_two = insert(:note, data: %{"context" => "suya.."})
    activity_two = insert(:note_activity, note: note_two)

    {:ok, _activity_two} = CommonAPI.add_mute(user, activity_two)

    assert [_activity_one] = ActivityPub.fetch_activities([], %{"muting_user" => user})
  end

  test "returns thread muted activities when with_muted is set" do
    user = insert(:user)
    _activity_one = insert(:note_activity)
    note_two = insert(:note, data: %{"context" => "suya.."})
    activity_two = insert(:note_activity, note: note_two)

    {:ok, _activity_two} = CommonAPI.add_mute(user, activity_two)

    assert [_activity_two, _activity_one] =
             ActivityPub.fetch_activities([], %{"muting_user" => user, "with_muted" => true})
  end

  test "does include announces on request" do
    activity_three = insert(:note_activity)
    user = insert(:user)
    booster = insert(:user)

    {:ok, user} = User.follow(user, booster)

    {:ok, announce, _object} = CommonAPI.repeat(activity_three.id, booster)

    [announce_activity] = ActivityPub.fetch_activities([user.ap_id | User.following(user)])

    assert announce_activity.id == announce.id
  end

  test "excludes reblogs on request" do
    user = insert(:user)
    {:ok, expected_activity} = ActivityBuilder.insert(%{"type" => "Create"}, %{:user => user})
    {:ok, _} = ActivityBuilder.insert(%{"type" => "Announce"}, %{:user => user})

    [activity] = ActivityPub.fetch_user_activities(user, nil, %{"exclude_reblogs" => "true"})

    assert activity == expected_activity
  end

  describe "public fetch activities" do
    test "doesn't retrieve unlisted activities" do
      user = insert(:user)

      {:ok, _unlisted_activity} =
        CommonAPI.post(user, %{"status" => "yeah", "visibility" => "unlisted"})

      {:ok, listed_activity} = CommonAPI.post(user, %{"status" => "yeah"})

      [activity] = ActivityPub.fetch_public_activities()

      assert activity == listed_activity
    end

    test "retrieves public activities" do
      _activities = ActivityPub.fetch_public_activities()

      %{public: public} = ActivityBuilder.public_and_non_public()

      activities = ActivityPub.fetch_public_activities()
      assert length(activities) == 1
      assert Enum.at(activities, 0) == public
    end

    test "retrieves a maximum of 20 activities" do
      ActivityBuilder.insert_list(10)
      expected_activities = ActivityBuilder.insert_list(20)

      activities = ActivityPub.fetch_public_activities()

      assert collect_ids(activities) == collect_ids(expected_activities)
      assert length(activities) == 20
    end

    test "retrieves ids starting from a since_id" do
      activities = ActivityBuilder.insert_list(30)
      expected_activities = ActivityBuilder.insert_list(10)
      since_id = List.last(activities).id

      activities = ActivityPub.fetch_public_activities(%{"since_id" => since_id})

      assert collect_ids(activities) == collect_ids(expected_activities)
      assert length(activities) == 10
    end

    test "retrieves ids up to max_id" do
      ActivityBuilder.insert_list(10)
      expected_activities = ActivityBuilder.insert_list(20)

      %{id: max_id} =
        10
        |> ActivityBuilder.insert_list()
        |> List.first()

      activities = ActivityPub.fetch_public_activities(%{"max_id" => max_id})

      assert length(activities) == 20
      assert collect_ids(activities) == collect_ids(expected_activities)
    end

    test "paginates via offset/limit" do
      _first_part_activities = ActivityBuilder.insert_list(10)
      second_part_activities = ActivityBuilder.insert_list(10)

      later_activities = ActivityBuilder.insert_list(10)

      activities =
        ActivityPub.fetch_public_activities(%{"page" => "2", "page_size" => "20"}, :offset)

      assert length(activities) == 20

      assert collect_ids(activities) ==
               collect_ids(second_part_activities) ++ collect_ids(later_activities)
    end

    test "doesn't return reblogs for users for whom reblogs have been muted" do
      activity = insert(:note_activity)
      user = insert(:user)
      booster = insert(:user)
      {:ok, _reblog_mute} = CommonAPI.hide_reblogs(user, booster)

      {:ok, activity, _} = CommonAPI.repeat(activity.id, booster)

      activities = ActivityPub.fetch_activities([], %{"muting_user" => user})

      refute Enum.any?(activities, fn %{id: id} -> id == activity.id end)
    end

    test "returns reblogs for users for whom reblogs have not been muted" do
      activity = insert(:note_activity)
      user = insert(:user)
      booster = insert(:user)
      {:ok, _reblog_mute} = CommonAPI.hide_reblogs(user, booster)
      {:ok, _reblog_mute} = CommonAPI.show_reblogs(user, booster)

      {:ok, activity, _} = CommonAPI.repeat(activity.id, booster)

      activities = ActivityPub.fetch_activities([], %{"muting_user" => user})

      assert Enum.any?(activities, fn %{id: id} -> id == activity.id end)
    end
  end

  describe "react to an object" do
    test_with_mock "sends an activity to federation", Federator, [:passthrough], [] do
      Config.put([:instance, :federating], true)
      user = insert(:user)
      reactor = insert(:user)
      {:ok, activity} = CommonAPI.post(user, %{"status" => "YASSSS queen slay"})
      assert object = Object.normalize(activity)

      {:ok, reaction_activity, _object} = ActivityPub.react_with_emoji(reactor, object, "🔥")

      assert called(Federator.publish(reaction_activity))
    end

    test "adds an emoji reaction activity to the db" do
      user = insert(:user)
      reactor = insert(:user)
      third_user = insert(:user)
      fourth_user = insert(:user)
      {:ok, activity} = CommonAPI.post(user, %{"status" => "YASSSS queen slay"})
      assert object = Object.normalize(activity)

      {:ok, reaction_activity, object} = ActivityPub.react_with_emoji(reactor, object, "🔥")

      assert reaction_activity

      assert reaction_activity.data["actor"] == reactor.ap_id
      assert reaction_activity.data["type"] == "EmojiReact"
      assert reaction_activity.data["content"] == "🔥"
      assert reaction_activity.data["object"] == object.data["id"]
      assert reaction_activity.data["to"] == [User.ap_followers(reactor), activity.data["actor"]]
      assert reaction_activity.data["context"] == object.data["context"]
      assert object.data["reaction_count"] == 1
      assert object.data["reactions"] == [["🔥", [reactor.ap_id]]]

      {:ok, _reaction_activity, object} = ActivityPub.react_with_emoji(third_user, object, "☕")

      assert object.data["reaction_count"] == 2
      assert object.data["reactions"] == [["🔥", [reactor.ap_id]], ["☕", [third_user.ap_id]]]

      {:ok, _reaction_activity, object} = ActivityPub.react_with_emoji(fourth_user, object, "🔥")

      assert object.data["reaction_count"] == 3

      assert object.data["reactions"] == [
               ["🔥", [fourth_user.ap_id, reactor.ap_id]],
               ["☕", [third_user.ap_id]]
             ]
    end

    test "reverts emoji reaction on error" do
      [user, reactor] = insert_list(2, :user)

      {:ok, activity} = CommonAPI.post(user, %{"status" => "Status"})
      object = Object.normalize(activity)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.react_with_emoji(reactor, object, "😀")
      end

      object = Object.get_by_ap_id(object.data["id"])
      refute object.data["reaction_count"]
      refute object.data["reactions"]
    end
  end

  describe "unreacting to an object" do
    test_with_mock "sends an activity to federation", Federator, [:passthrough], [] do
      Config.put([:instance, :federating], true)
      user = insert(:user)
      reactor = insert(:user)
      {:ok, activity} = CommonAPI.post(user, %{"status" => "YASSSS queen slay"})
      assert object = Object.normalize(activity)

      {:ok, reaction_activity, _object} = ActivityPub.react_with_emoji(reactor, object, "🔥")

      assert called(Federator.publish(reaction_activity))

      {:ok, unreaction_activity, _object} =
        ActivityPub.unreact_with_emoji(reactor, reaction_activity.data["id"])

      assert called(Federator.publish(unreaction_activity))
    end

    test "adds an undo activity to the db" do
      user = insert(:user)
      reactor = insert(:user)
      {:ok, activity} = CommonAPI.post(user, %{"status" => "YASSSS queen slay"})
      assert object = Object.normalize(activity)

      {:ok, reaction_activity, _object} = ActivityPub.react_with_emoji(reactor, object, "🔥")

      {:ok, unreaction_activity, _object} =
        ActivityPub.unreact_with_emoji(reactor, reaction_activity.data["id"])

      assert unreaction_activity.actor == reactor.ap_id
      assert unreaction_activity.data["object"] == reaction_activity.data["id"]

      object = Object.get_by_ap_id(object.data["id"])
      assert object.data["reaction_count"] == 0
      assert object.data["reactions"] == []
    end

    test "reverts emoji unreact on error" do
      [user, reactor] = insert_list(2, :user)
      {:ok, activity} = CommonAPI.post(user, %{"status" => "Status"})
      object = Object.normalize(activity)

      {:ok, reaction_activity, _object} = ActivityPub.react_with_emoji(reactor, object, "😀")

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} =
                 ActivityPub.unreact_with_emoji(reactor, reaction_activity.data["id"])
      end

      object = Object.get_by_ap_id(object.data["id"])

      assert object.data["reaction_count"] == 1
      assert object.data["reactions"] == [["😀", [reactor.ap_id]]]
    end
  end

  describe "like an object" do
    test_with_mock "sends an activity to federation", Federator, [:passthrough], [] do
      Config.put([:instance, :federating], true)
      note_activity = insert(:note_activity)
      assert object_activity = Object.normalize(note_activity)

      user = insert(:user)

      {:ok, like_activity, _object} = ActivityPub.like(user, object_activity)
      assert called(Federator.publish(like_activity))
    end

    test "returns exist activity if object already liked" do
      note_activity = insert(:note_activity)
      assert object_activity = Object.normalize(note_activity)

      user = insert(:user)

      {:ok, like_activity, _object} = ActivityPub.like(user, object_activity)

      {:ok, like_activity_exist, _object} = ActivityPub.like(user, object_activity)
      assert like_activity == like_activity_exist
    end

    test "reverts like activity on error" do
      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.like(user, object)
      end

      assert Repo.aggregate(Activity, :count, :id) == 1
      assert Repo.get(Object, object.id) == object
    end

    test "adds a like activity to the db" do
      note_activity = insert(:note_activity)
      assert object = Object.normalize(note_activity)

      user = insert(:user)
      user_two = insert(:user)

      {:ok, like_activity, object} = ActivityPub.like(user, object)

      assert like_activity.data["actor"] == user.ap_id
      assert like_activity.data["type"] == "Like"
      assert like_activity.data["object"] == object.data["id"]
      assert like_activity.data["to"] == [User.ap_followers(user), note_activity.data["actor"]]
      assert like_activity.data["context"] == object.data["context"]
      assert object.data["like_count"] == 1
      assert object.data["likes"] == [user.ap_id]

      # Just return the original activity if the user already liked it.
      {:ok, same_like_activity, object} = ActivityPub.like(user, object)

      assert like_activity == same_like_activity
      assert object.data["likes"] == [user.ap_id]
      assert object.data["like_count"] == 1

      {:ok, _like_activity, object} = ActivityPub.like(user_two, object)
      assert object.data["like_count"] == 2
    end
  end

  describe "unliking" do
    test_with_mock "sends an activity to federation", Federator, [:passthrough], [] do
      Config.put([:instance, :federating], true)

      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      {:ok, object} = ActivityPub.unlike(user, object)
      refute called(Federator.publish())

      {:ok, _like_activity, object} = ActivityPub.like(user, object)
      assert object.data["like_count"] == 1

      {:ok, unlike_activity, _, object} = ActivityPub.unlike(user, object)
      assert object.data["like_count"] == 0

      assert called(Federator.publish(unlike_activity))
    end

    test "reverts unliking on error" do
      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      {:ok, like_activity, object} = ActivityPub.like(user, object)
      assert object.data["like_count"] == 1

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.unlike(user, object)
      end

      assert Object.get_by_ap_id(object.data["id"]) == object
      assert object.data["like_count"] == 1
      assert Activity.get_by_id(like_activity.id)
    end

    test "unliking a previously liked object" do
      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      # Unliking something that hasn't been liked does nothing
      {:ok, object} = ActivityPub.unlike(user, object)
      assert object.data["like_count"] == 0

      {:ok, like_activity, object} = ActivityPub.like(user, object)
      assert object.data["like_count"] == 1

      {:ok, unlike_activity, _, object} = ActivityPub.unlike(user, object)
      assert object.data["like_count"] == 0

      assert Activity.get_by_id(like_activity.id) == nil
      assert note_activity.actor in unlike_activity.recipients
    end
  end

  describe "announcing an object" do
    test "adds an announce activity to the db" do
      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      {:ok, announce_activity, object} = ActivityPub.announce(user, object)
      assert object.data["announcement_count"] == 1
      assert object.data["announcements"] == [user.ap_id]

      assert announce_activity.data["to"] == [
               User.ap_followers(user),
               note_activity.data["actor"]
             ]

      assert announce_activity.data["object"] == object.data["id"]
      assert announce_activity.data["actor"] == user.ap_id
      assert announce_activity.data["context"] == object.data["context"]
    end

    test "reverts annouce from object on error" do
      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.announce(user, object)
      end

      reloaded_object = Object.get_by_ap_id(object.data["id"])
      assert reloaded_object == object
      refute reloaded_object.data["announcement_count"]
      refute reloaded_object.data["announcements"]
    end
  end

  describe "announcing a private object" do
    test "adds an announce activity to the db if the audience is not widened" do
      user = insert(:user)
      {:ok, note_activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "private"})
      object = Object.normalize(note_activity)

      {:ok, announce_activity, object} = ActivityPub.announce(user, object, nil, true, false)

      assert announce_activity.data["to"] == [User.ap_followers(user)]

      assert announce_activity.data["object"] == object.data["id"]
      assert announce_activity.data["actor"] == user.ap_id
      assert announce_activity.data["context"] == object.data["context"]
    end

    test "does not add an announce activity to the db if the audience is widened" do
      user = insert(:user)
      {:ok, note_activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "private"})
      object = Object.normalize(note_activity)

      assert {:error, _} = ActivityPub.announce(user, object, nil, true, true)
    end

    test "does not add an announce activity to the db if the announcer is not the author" do
      user = insert(:user)
      announcer = insert(:user)
      {:ok, note_activity} = CommonAPI.post(user, %{"status" => ".", "visibility" => "private"})
      object = Object.normalize(note_activity)

      assert {:error, _} = ActivityPub.announce(announcer, object, nil, true, false)
    end
  end

  describe "unannouncing an object" do
    test "unannouncing a previously announced object" do
      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      # Unannouncing an object that is not announced does nothing
      {:ok, object} = ActivityPub.unannounce(user, object)
      refute object.data["announcement_count"]

      {:ok, announce_activity, object} = ActivityPub.announce(user, object)
      assert object.data["announcement_count"] == 1

      {:ok, unannounce_activity, object} = ActivityPub.unannounce(user, object)
      assert object.data["announcement_count"] == 0

      assert unannounce_activity.data["to"] == [
               User.ap_followers(user),
               object.data["actor"]
             ]

      assert unannounce_activity.data["type"] == "Undo"
      assert unannounce_activity.data["object"] == announce_activity.data
      assert unannounce_activity.data["actor"] == user.ap_id
      assert unannounce_activity.data["context"] == announce_activity.data["context"]

      assert Activity.get_by_id(announce_activity.id) == nil
    end

    test "reverts unannouncing on error" do
      note_activity = insert(:note_activity)
      object = Object.normalize(note_activity)
      user = insert(:user)

      {:ok, _announce_activity, object} = ActivityPub.announce(user, object)
      assert object.data["announcement_count"] == 1

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.unannounce(user, object)
      end

      object = Object.get_by_ap_id(object.data["id"])
      assert object.data["announcement_count"] == 1
    end
  end

  describe "uploading files" do
    test "copies the file to the configured folder" do
      file = %Plug.Upload{
        content_type: "image/jpg",
        path: Path.absname("test/fixtures/image.jpg"),
        filename: "an_image.jpg"
      }

      {:ok, %Object{} = object} = ActivityPub.upload(file)
      assert object.data["name"] == "an_image.jpg"
    end

    test "works with base64 encoded images" do
      file = %{
        "img" => data_uri()
      }

      {:ok, %Object{}} = ActivityPub.upload(file)
    end
  end

  describe "fetch the latest Follow" do
    test "fetches the latest Follow activity" do
      %Activity{data: %{"type" => "Follow"}} = activity = insert(:follow_activity)
      follower = Repo.get_by(User, ap_id: activity.data["actor"])
      followed = Repo.get_by(User, ap_id: activity.data["object"])

      assert activity == Utils.fetch_latest_follow(follower, followed)
    end
  end

  describe "following / unfollowing" do
    test "it reverts follow activity" do
      follower = insert(:user)
      followed = insert(:user)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.follow(follower, followed)
      end

      assert Repo.aggregate(Activity, :count, :id) == 0
      assert Repo.aggregate(Object, :count, :id) == 0
    end

    test "it reverts unfollow activity" do
      follower = insert(:user)
      followed = insert(:user)

      {:ok, follow_activity} = ActivityPub.follow(follower, followed)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.unfollow(follower, followed)
      end

      activity = Activity.get_by_id(follow_activity.id)
      assert activity.data["type"] == "Follow"
      assert activity.data["actor"] == follower.ap_id

      assert activity.data["object"] == followed.ap_id
    end

    test "creates a follow activity" do
      follower = insert(:user)
      followed = insert(:user)

      {:ok, activity} = ActivityPub.follow(follower, followed)
      assert activity.data["type"] == "Follow"
      assert activity.data["actor"] == follower.ap_id
      assert activity.data["object"] == followed.ap_id
    end

    test "creates an undo activity for the last follow" do
      follower = insert(:user)
      followed = insert(:user)

      {:ok, follow_activity} = ActivityPub.follow(follower, followed)
      {:ok, activity} = ActivityPub.unfollow(follower, followed)

      assert activity.data["type"] == "Undo"
      assert activity.data["actor"] == follower.ap_id

      embedded_object = activity.data["object"]
      assert is_map(embedded_object)
      assert embedded_object["type"] == "Follow"
      assert embedded_object["object"] == followed.ap_id
      assert embedded_object["id"] == follow_activity.data["id"]
    end

    test "creates an undo activity for a pending follow request" do
      follower = insert(:user)
      followed = insert(:user, %{locked: true})

      {:ok, follow_activity} = ActivityPub.follow(follower, followed)
      {:ok, activity} = ActivityPub.unfollow(follower, followed)

      assert activity.data["type"] == "Undo"
      assert activity.data["actor"] == follower.ap_id

      embedded_object = activity.data["object"]
      assert is_map(embedded_object)
      assert embedded_object["type"] == "Follow"
      assert embedded_object["object"] == followed.ap_id
      assert embedded_object["id"] == follow_activity.data["id"]
    end
  end

  describe "blocking / unblocking" do
    test "reverts block activity on error" do
      [blocker, blocked] = insert_list(2, :user)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.block(blocker, blocked)
      end

      assert Repo.aggregate(Activity, :count, :id) == 0
      assert Repo.aggregate(Object, :count, :id) == 0
    end

    test "creates a block activity" do
      blocker = insert(:user)
      blocked = insert(:user)

      {:ok, activity} = ActivityPub.block(blocker, blocked)

      assert activity.data["type"] == "Block"
      assert activity.data["actor"] == blocker.ap_id
      assert activity.data["object"] == blocked.ap_id
    end

    test "reverts unblock activity on error" do
      [blocker, blocked] = insert_list(2, :user)
      {:ok, block_activity} = ActivityPub.block(blocker, blocked)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.unblock(blocker, blocked)
      end

      assert block_activity.data["type"] == "Block"
      assert block_activity.data["actor"] == blocker.ap_id

      assert Repo.aggregate(Activity, :count, :id) == 1
      assert Repo.aggregate(Object, :count, :id) == 1
    end

    test "creates an undo activity for the last block" do
      blocker = insert(:user)
      blocked = insert(:user)

      {:ok, block_activity} = ActivityPub.block(blocker, blocked)
      {:ok, activity} = ActivityPub.unblock(blocker, blocked)

      assert activity.data["type"] == "Undo"
      assert activity.data["actor"] == blocker.ap_id

      embedded_object = activity.data["object"]
      assert is_map(embedded_object)
      assert embedded_object["type"] == "Block"
      assert embedded_object["object"] == blocked.ap_id
      assert embedded_object["id"] == block_activity.data["id"]
    end
  end

  describe "deletion" do
    setup do: clear_config([:instance, :rewrite_policy])

    test "it reverts deletion on error" do
      note = insert(:note_activity)
      object = Object.normalize(note)

      with_mock(Utils, [:passthrough], maybe_federate: fn _ -> {:error, :reverted} end) do
        assert {:error, :reverted} = ActivityPub.delete(object)
      end

      assert Repo.aggregate(Activity, :count, :id) == 1
      assert Repo.get(Object, object.id) == object
      assert Activity.get_by_id(note.id) == note
    end

    test "it creates a delete activity and deletes the original object" do
      note = insert(:note_activity)
      object = Object.normalize(note)
      {:ok, delete} = ActivityPub.delete(object)

      assert delete.data["type"] == "Delete"
      assert delete.data["actor"] == note.data["actor"]
      assert delete.data["object"] == object.data["id"]

      assert Activity.get_by_id(delete.id) != nil

      assert Repo.get(Object, object.id).data["type"] == "Tombstone"
    end

    test "it doesn't fail when an activity was already deleted" do
      {:ok, delete} = insert(:note_activity) |> Object.normalize() |> ActivityPub.delete()

      assert {:ok, ^delete} = delete |> Object.normalize() |> ActivityPub.delete()
    end

    test "decrements user note count only for public activities" do
      user = insert(:user, note_count: 10)

      {:ok, a1} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "yeah",
          "visibility" => "public"
        })

      {:ok, a2} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "yeah",
          "visibility" => "unlisted"
        })

      {:ok, a3} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "yeah",
          "visibility" => "private"
        })

      {:ok, a4} =
        CommonAPI.post(User.get_cached_by_id(user.id), %{
          "status" => "yeah",
          "visibility" => "direct"
        })

      {:ok, _} = Object.normalize(a1) |> ActivityPub.delete()
      {:ok, _} = Object.normalize(a2) |> ActivityPub.delete()
      {:ok, _} = Object.normalize(a3) |> ActivityPub.delete()
      {:ok, _} = Object.normalize(a4) |> ActivityPub.delete()

      user = User.get_cached_by_id(user.id)
      assert user.note_count == 10
    end

    test "it creates a delete activity and checks that it is also sent to users mentioned by the deleted object" do
      user = insert(:user)
      note = insert(:note_activity)
      object = Object.normalize(note)

      {:ok, object} =
        object
        |> Object.change(%{
          data: %{
            "actor" => object.data["actor"],
            "id" => object.data["id"],
            "to" => [user.ap_id],
            "type" => "Note"
          }
        })
        |> Object.update_and_set_cache()

      {:ok, delete} = ActivityPub.delete(object)

      assert user.ap_id in delete.data["to"]
    end

    test "decreases reply count" do
      user = insert(:user)
      user2 = insert(:user)

      {:ok, activity} = CommonAPI.post(user, %{"status" => "1", "visibility" => "public"})
      reply_data = %{"status" => "1", "in_reply_to_status_id" => activity.id}
      ap_id = activity.data["id"]

      {:ok, public_reply} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "public"))
      {:ok, unlisted_reply} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "unlisted"))
      {:ok, private_reply} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "private"))
      {:ok, direct_reply} = CommonAPI.post(user2, Map.put(reply_data, "visibility", "direct"))

      _ = CommonAPI.delete(direct_reply.id, user2)
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 2

      _ = CommonAPI.delete(private_reply.id, user2)
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 2

      _ = CommonAPI.delete(public_reply.id, user2)
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 1

      _ = CommonAPI.delete(unlisted_reply.id, user2)
      assert %{data: data, object: object} = Activity.get_by_ap_id_with_object(ap_id)
      assert object.data["repliesCount"] == 0
    end

    test "it passes delete activity through MRF before deleting the object" do
      Pleroma.Config.put([:instance, :rewrite_policy], Pleroma.Web.ActivityPub.MRF.DropPolicy)

      note = insert(:note_activity)
      object = Object.normalize(note)

      {:error, {:reject, _}} = ActivityPub.delete(object)

      assert Activity.get_by_id(note.id)
      assert Repo.get(Object, object.id).data["type"] == object.data["type"]
    end
  end

  describe "timeline post-processing" do
    test "it filters broken threads" do
      user1 = insert(:user)
      user2 = insert(:user)
      user3 = insert(:user)

      {:ok, user1} = User.follow(user1, user3)
      assert User.following?(user1, user3)

      {:ok, user2} = User.follow(user2, user3)
      assert User.following?(user2, user3)

      {:ok, user3} = User.follow(user3, user2)
      assert User.following?(user3, user2)

      {:ok, public_activity} = CommonAPI.post(user3, %{"status" => "hi 1"})

      {:ok, private_activity_1} =
        CommonAPI.post(user3, %{"status" => "hi 2", "visibility" => "private"})

      {:ok, private_activity_2} =
        CommonAPI.post(user2, %{
          "status" => "hi 3",
          "visibility" => "private",
          "in_reply_to_status_id" => private_activity_1.id
        })

      {:ok, private_activity_3} =
        CommonAPI.post(user3, %{
          "status" => "hi 4",
          "visibility" => "private",
          "in_reply_to_status_id" => private_activity_2.id
        })

      activities =
        ActivityPub.fetch_activities([user1.ap_id | User.following(user1)])
        |> Enum.map(fn a -> a.id end)

      private_activity_1 = Activity.get_by_ap_id_with_object(private_activity_1.data["id"])

      assert [public_activity.id, private_activity_1.id, private_activity_3.id] == activities

      assert length(activities) == 3

      activities =
        ActivityPub.fetch_activities([user1.ap_id | User.following(user1)], %{"user" => user1})
        |> Enum.map(fn a -> a.id end)

      assert [public_activity.id, private_activity_1.id] == activities
      assert length(activities) == 2
    end
  end

  describe "update" do
    setup do: clear_config([:instance, :max_pinned_statuses])

    test "it creates an update activity with the new user data" do
      user = insert(:user)
      {:ok, user} = User.ensure_keys_present(user)
      user_data = Pleroma.Web.ActivityPub.UserView.render("user.json", %{user: user})

      {:ok, update} =
        ActivityPub.update(%{
          actor: user_data["id"],
          to: [user.follower_address],
          cc: [],
          object: user_data
        })

      assert update.data["actor"] == user.ap_id
      assert update.data["to"] == [user.follower_address]
      assert embedded_object = update.data["object"]
      assert embedded_object["id"] == user_data["id"]
      assert embedded_object["type"] == user_data["type"]
    end
  end

  test "returned pinned statuses" do
    Config.put([:instance, :max_pinned_statuses], 3)
    user = insert(:user)

    {:ok, activity_one} = CommonAPI.post(user, %{"status" => "HI!!!"})
    {:ok, activity_two} = CommonAPI.post(user, %{"status" => "HI!!!"})
    {:ok, activity_three} = CommonAPI.post(user, %{"status" => "HI!!!"})

    CommonAPI.pin(activity_one.id, user)
    user = refresh_record(user)

    CommonAPI.pin(activity_two.id, user)
    user = refresh_record(user)

    CommonAPI.pin(activity_three.id, user)
    user = refresh_record(user)

    activities = ActivityPub.fetch_user_activities(user, nil, %{"pinned" => "true"})

    assert 3 = length(activities)
  end

  describe "flag/1" do
    setup do
      reporter = insert(:user)
      target_account = insert(:user)
      content = "foobar"
      {:ok, activity} = CommonAPI.post(target_account, %{"status" => content})
      context = Utils.generate_context_id()

      reporter_ap_id = reporter.ap_id
      target_ap_id = target_account.ap_id
      activity_ap_id = activity.data["id"]

      activity_with_object = Activity.get_by_ap_id_with_object(activity_ap_id)

      {:ok,
       %{
         reporter: reporter,
         context: context,
         target_account: target_account,
         reported_activity: activity,
         content: content,
         activity_ap_id: activity_ap_id,
         activity_with_object: activity_with_object,
         reporter_ap_id: reporter_ap_id,
         target_ap_id: target_ap_id
       }}
    end

    test "it can create a Flag activity",
         %{
           reporter: reporter,
           context: context,
           target_account: target_account,
           reported_activity: reported_activity,
           content: content,
           activity_ap_id: activity_ap_id,
           activity_with_object: activity_with_object,
           reporter_ap_id: reporter_ap_id,
           target_ap_id: target_ap_id
         } do
      assert {:ok, activity} =
               ActivityPub.flag(%{
                 actor: reporter,
                 context: context,
                 account: target_account,
                 statuses: [reported_activity],
                 content: content
               })

      note_obj = %{
        "type" => "Note",
        "id" => activity_ap_id,
        "content" => content,
        "published" => activity_with_object.object.data["published"],
        "actor" => AccountView.render("show.json", %{user: target_account})
      }

      assert %Activity{
               actor: ^reporter_ap_id,
               data: %{
                 "type" => "Flag",
                 "content" => ^content,
                 "context" => ^context,
                 "object" => [^target_ap_id, ^note_obj]
               }
             } = activity
    end

    test_with_mock "strips status data from Flag, before federating it",
                   %{
                     reporter: reporter,
                     context: context,
                     target_account: target_account,
                     reported_activity: reported_activity,
                     content: content
                   },
                   Utils,
                   [:passthrough],
                   [] do
      {:ok, activity} =
        ActivityPub.flag(%{
          actor: reporter,
          context: context,
          account: target_account,
          statuses: [reported_activity],
          content: content
        })

      new_data =
        put_in(activity.data, ["object"], [target_account.ap_id, reported_activity.data["id"]])

      assert_called(Utils.maybe_federate(%{activity | data: new_data}))
    end
  end

  test "fetch_activities/2 returns activities addressed to a list " do
    user = insert(:user)
    member = insert(:user)
    {:ok, list} = Pleroma.List.create("foo", user)
    {:ok, list} = Pleroma.List.follow(list, member)

    {:ok, activity} =
      CommonAPI.post(user, %{"status" => "foobar", "visibility" => "list:#{list.id}"})

    activity = Repo.preload(activity, :bookmark)
    activity = %Activity{activity | thread_muted?: !!activity.thread_muted?}

    assert ActivityPub.fetch_activities([], %{"user" => user}) == [activity]
  end

  def data_uri do
    File.read!("test/fixtures/avatar_data_uri")
  end

  describe "fetch_activities_bounded" do
    test "fetches private posts for followed users" do
      user = insert(:user)

      {:ok, activity} =
        CommonAPI.post(user, %{
          "status" => "thought I looked cute might delete later :3",
          "visibility" => "private"
        })

      [result] = ActivityPub.fetch_activities_bounded([user.follower_address], [])
      assert result.id == activity.id
    end

    test "fetches only public posts for other users" do
      user = insert(:user)
      {:ok, activity} = CommonAPI.post(user, %{"status" => "#cofe", "visibility" => "public"})

      {:ok, _private_activity} =
        CommonAPI.post(user, %{
          "status" => "why is tenshi eating a corndog so cute?",
          "visibility" => "private"
        })

      [result] = ActivityPub.fetch_activities_bounded([], [user.follower_address])
      assert result.id == activity.id
    end
  end

  describe "fetch_follow_information_for_user" do
    test "syncronizes following/followers counters" do
      user =
        insert(:user,
          local: false,
          follower_address: "http://localhost:4001/users/fuser2/followers",
          following_address: "http://localhost:4001/users/fuser2/following"
        )

      {:ok, info} = ActivityPub.fetch_follow_information_for_user(user)
      assert info.follower_count == 527
      assert info.following_count == 267
    end

    test "detects hidden followers" do
      mock(fn env ->
        case env.url do
          "http://localhost:4001/users/masto_closed/followers?page=1" ->
            %Tesla.Env{status: 403, body: ""}

          _ ->
            apply(HttpRequestMock, :request, [env])
        end
      end)

      user =
        insert(:user,
          local: false,
          follower_address: "http://localhost:4001/users/masto_closed/followers",
          following_address: "http://localhost:4001/users/masto_closed/following"
        )

      {:ok, follow_info} = ActivityPub.fetch_follow_information_for_user(user)
      assert follow_info.hide_followers == true
      assert follow_info.hide_follows == false
    end

    test "detects hidden follows" do
      mock(fn env ->
        case env.url do
          "http://localhost:4001/users/masto_closed/following?page=1" ->
            %Tesla.Env{status: 403, body: ""}

          _ ->
            apply(HttpRequestMock, :request, [env])
        end
      end)

      user =
        insert(:user,
          local: false,
          follower_address: "http://localhost:4001/users/masto_closed/followers",
          following_address: "http://localhost:4001/users/masto_closed/following"
        )

      {:ok, follow_info} = ActivityPub.fetch_follow_information_for_user(user)
      assert follow_info.hide_followers == false
      assert follow_info.hide_follows == true
    end

    test "detects hidden follows/followers for friendica" do
      user =
        insert(:user,
          local: false,
          follower_address: "http://localhost:8080/followers/fuser3",
          following_address: "http://localhost:8080/following/fuser3"
        )

      {:ok, follow_info} = ActivityPub.fetch_follow_information_for_user(user)
      assert follow_info.hide_followers == true
      assert follow_info.follower_count == 296
      assert follow_info.following_count == 32
      assert follow_info.hide_follows == true
    end

    test "doesn't crash when follower and following counters are hidden" do
      mock(fn env ->
        case env.url do
          "http://localhost:4001/users/masto_hidden_counters/following" ->
            json(%{
              "@context" => "https://www.w3.org/ns/activitystreams",
              "id" => "http://localhost:4001/users/masto_hidden_counters/followers"
            })

          "http://localhost:4001/users/masto_hidden_counters/following?page=1" ->
            %Tesla.Env{status: 403, body: ""}

          "http://localhost:4001/users/masto_hidden_counters/followers" ->
            json(%{
              "@context" => "https://www.w3.org/ns/activitystreams",
              "id" => "http://localhost:4001/users/masto_hidden_counters/following"
            })

          "http://localhost:4001/users/masto_hidden_counters/followers?page=1" ->
            %Tesla.Env{status: 403, body: ""}
        end
      end)

      user =
        insert(:user,
          local: false,
          follower_address: "http://localhost:4001/users/masto_hidden_counters/followers",
          following_address: "http://localhost:4001/users/masto_hidden_counters/following"
        )

      {:ok, follow_info} = ActivityPub.fetch_follow_information_for_user(user)

      assert follow_info.hide_followers == true
      assert follow_info.follower_count == 0
      assert follow_info.hide_follows == true
      assert follow_info.following_count == 0
    end
  end

  describe "fetch_favourites/3" do
    test "returns a favourite activities sorted by adds to favorite" do
      user = insert(:user)
      other_user = insert(:user)
      user1 = insert(:user)
      user2 = insert(:user)
      {:ok, a1} = CommonAPI.post(user1, %{"status" => "bla"})
      {:ok, _a2} = CommonAPI.post(user2, %{"status" => "traps are happy"})
      {:ok, a3} = CommonAPI.post(user2, %{"status" => "Trees Are "})
      {:ok, a4} = CommonAPI.post(user2, %{"status" => "Agent Smith "})
      {:ok, a5} = CommonAPI.post(user1, %{"status" => "Red or Blue "})

      {:ok, _} = CommonAPI.favorite(user, a4.id)
      {:ok, _} = CommonAPI.favorite(other_user, a3.id)
      {:ok, _} = CommonAPI.favorite(user, a3.id)
      {:ok, _} = CommonAPI.favorite(other_user, a5.id)
      {:ok, _} = CommonAPI.favorite(user, a5.id)
      {:ok, _} = CommonAPI.favorite(other_user, a4.id)
      {:ok, _} = CommonAPI.favorite(user, a1.id)
      {:ok, _} = CommonAPI.favorite(other_user, a1.id)
      result = ActivityPub.fetch_favourites(user)

      assert Enum.map(result, & &1.id) == [a1.id, a5.id, a3.id, a4.id]

      result = ActivityPub.fetch_favourites(user, %{"limit" => 2})
      assert Enum.map(result, & &1.id) == [a1.id, a5.id]
    end
  end

  describe "Move activity" do
    test "create" do
      %{ap_id: old_ap_id} = old_user = insert(:user)
      %{ap_id: new_ap_id} = new_user = insert(:user, also_known_as: [old_ap_id])
      follower = insert(:user)
      follower_move_opted_out = insert(:user, allow_following_move: false)

      User.follow(follower, old_user)
      User.follow(follower_move_opted_out, old_user)

      assert User.following?(follower, old_user)
      assert User.following?(follower_move_opted_out, old_user)

      assert {:ok, activity} = ActivityPub.move(old_user, new_user)

      assert %Activity{
               actor: ^old_ap_id,
               data: %{
                 "actor" => ^old_ap_id,
                 "object" => ^old_ap_id,
                 "target" => ^new_ap_id,
                 "type" => "Move"
               },
               local: true
             } = activity

      params = %{
        "op" => "move_following",
        "origin_id" => old_user.id,
        "target_id" => new_user.id
      }

      assert_enqueued(worker: Pleroma.Workers.BackgroundWorker, args: params)

      Pleroma.Workers.BackgroundWorker.perform(params, nil)

      refute User.following?(follower, old_user)
      assert User.following?(follower, new_user)

      assert User.following?(follower_move_opted_out, old_user)
      refute User.following?(follower_move_opted_out, new_user)

      activity = %Activity{activity | object: nil}

      assert [%Notification{activity: ^activity}] = Notification.for_user(follower)

      assert [%Notification{activity: ^activity}] = Notification.for_user(follower_move_opted_out)
    end

    test "old user must be in the new user's `also_known_as` list" do
      old_user = insert(:user)
      new_user = insert(:user)

      assert {:error, "Target account must have the origin in `alsoKnownAs`"} =
               ActivityPub.move(old_user, new_user)
    end
  end
end