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Merge branch 'feature/emojireactvalidator' into 'develop'

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Move EmojiReacts to the Pipeline.

See merge request pleroma/pleroma!2473
This commit is contained in:
lain 2020-05-08 10:41:41 +00:00
commit fbcc53760e
19 changed files with 276 additions and 169 deletions
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25
lib/pleroma/web/activity_pub/activity_pub.ex
View File

@ -356,31 +356,6 @@ def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
end
end
@spec react_with_emoji(User.t(), Object.t(), String.t(), keyword()) ::
{:ok, Activity.t(), Object.t()} | {:error, any()}
def react_with_emoji(user, object, emoji, options \\ []) do
with {:ok, result} <-
Repo.transaction(fn -> do_react_with_emoji(user, object, emoji, options) end) do
result
end
end
defp do_react_with_emoji(user, object, emoji, options) do
with local <- Keyword.get(options, :local, true),
activity_id <- Keyword.get(options, :activity_id, nil),
true <- Pleroma.Emoji.is_unicode_emoji?(emoji),
reaction_data <- make_emoji_reaction_data(user, object, emoji, activity_id),
{:ok, activity} <- insert(reaction_data, local),
{:ok, object} <- add_emoji_reaction_to_object(activity, object),
_ <- notify_and_stream(activity),
:ok <- maybe_federate(activity) do
{:ok, activity, object}
else
false -> {:error, false}
{:error, error} -> Repo.rollback(error)
end
end
@spec announce(User.t(), Object.t(), String.t() | nil, boolean(), boolean()) ::
{:ok, Activity.t(), Object.t()} | {:error, any()}
def announce(

24
lib/pleroma/web/activity_pub/builder.ex
View File

@ -10,6 +10,18 @@ defmodule Pleroma.Web.ActivityPub.Builder do
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.ActivityPub.Visibility
@spec emoji_react(User.t(), Object.t(), String.t()) :: {:ok, map(), keyword()}
def emoji_react(actor, object, emoji) do
with {:ok, data, meta} <- object_action(actor, object) do
data =
data
|> Map.put("content", emoji)
|> Map.put("type", "EmojiReact")
{:ok, data, meta}
end
end
@spec undo(User.t(), Activity.t()) :: {:ok, map(), keyword()}
def undo(actor, object) do
{:ok,
@ -52,6 +64,17 @@ def delete(actor, object_id) do
@spec like(User.t(), Object.t()) :: {:ok, map(), keyword()}
def like(actor, object) do
with {:ok, data, meta} <- object_action(actor, object) do
data =
data
|> Map.put("type", "Like")
{:ok, data, meta}
end
end
@spec object_action(User.t(), Object.t()) :: {:ok, map(), keyword()}
defp object_action(actor, object) do
object_actor = User.get_cached_by_ap_id(object.data["actor"])
# Address the actor of the object, and our actor's follower collection if the post is public.
@ -73,7 +96,6 @@ def like(actor, object) do
%{
"id" => Utils.generate_activity_id(),
"actor" => actor.ap_id,
"type" => "Like",
"object" => object.data["id"],
"to" => to,
"cc" => cc,

11
lib/pleroma/web/activity_pub/object_validator.ex
View File

@ -12,6 +12,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidator do
alias Pleroma.Object
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
alias Pleroma.Web.ActivityPub.ObjectValidators.Types
alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
@ -47,6 +48,16 @@ def validate(%{"type" => "Like"} = object, meta) do
end
end
def validate(%{"type" => "EmojiReact"} = object, meta) do
with {:ok, object} <-
object
|> EmojiReactValidator.cast_and_validate()
|> Ecto.Changeset.apply_action(:insert) do
object = stringify_keys(object |> Map.from_struct())
{:ok, object, meta}
end
end
def stringify_keys(%{__struct__: _} = object) do
object
|> Map.from_struct()

81
lib/pleroma/web/activity_pub/object_validators/emoji_react_validator.ex Normal file
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@ -0,0 +1,81 @@
# 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.ObjectValidators.EmojiReactValidator do
use Ecto.Schema
alias Pleroma.Object
alias Pleroma.Web.ActivityPub.ObjectValidators.Types
import Ecto.Changeset
import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
@primary_key false
embedded_schema do
field(:id, Types.ObjectID, primary_key: true)
field(:type, :string)
field(:object, Types.ObjectID)
field(:actor, Types.ObjectID)
field(:context, :string)
field(:content, :string)
field(:to, {:array, :string}, default: [])
field(:cc, {:array, :string}, default: [])
end
def cast_and_validate(data) do
data
|> cast_data()
|> validate_data()
end
def cast_data(data) do
%__MODULE__{}
|> changeset(data)
end
def changeset(struct, data) do
struct
|> cast(data, __schema__(:fields))
|> fix_after_cast()
end
def fix_after_cast(cng) do
cng
|> fix_context()
end
def fix_context(cng) do
object = get_field(cng, :object)
with nil <- get_field(cng, :context),
%Object{data: %{"context" => context}} <- Object.get_cached_by_ap_id(object) do
cng
|> put_change(:context, context)
else
_ ->
cng
end
end
def validate_emoji(cng) do
content = get_field(cng, :content)
if Pleroma.Emoji.is_unicode_emoji?(content) do
cng
else
cng
|> add_error(:content, "must be a single character emoji")
end
end
def validate_data(data_cng) do
data_cng
|> validate_inclusion(:type, ["EmojiReact"])
|> validate_required([:id, :type, :object, :actor, :context, :to, :cc, :content])
|> validate_actor_presence()
|> validate_object_presence()
|> validate_emoji()
end
end

12
lib/pleroma/web/activity_pub/side_effects.ex
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@ -34,6 +34,18 @@ def handle(%{data: %{"type" => "Undo", "object" => undone_object}} = object, met
end
end
# Tasks this handles:
# - Add reaction to object
# - Set up notification
def handle(%{data: %{"type" => "EmojiReact"}} = object, meta) do
reacted_object = Object.get_by_ap_id(object.data["object"])
Utils.add_emoji_reaction_to_object(object, reacted_object)
Notification.create_notifications(object)
{:ok, object, meta}
end
# Tasks this handles:
# - Delete and unpins the create activity
# - Replace object with Tombstone

23
lib/pleroma/web/activity_pub/transmogrifier.ex
View File

@ -656,7 +656,7 @@ def handle_incoming(
|> handle_incoming(options)
end
def handle_incoming(%{"type" => "Like"} = data, _options) do
def handle_incoming(%{"type" => type} = data, _options) when type in ["Like", "EmojiReact"] do
with :ok <- ObjectValidator.fetch_actor_and_object(data),
{:ok, activity, _meta} <-
Pipeline.common_pipeline(data, local: false) do
@ -666,27 +666,6 @@ def handle_incoming(%{"type" => "Like"} = data, _options) do
end
end
def handle_incoming(
%{
"type" => "EmojiReact",
"object" => object_id,
"actor" => _actor,
"id" => id,
"content" => emoji
} = data,
_options
) do
with actor <- Containment.get_actor(data),
{:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(actor),
{:ok, object} <- get_obj_helper(object_id),
{:ok, activity, _object} <-
ActivityPub.react_with_emoji(actor, object, emoji, activity_id: id, local: false) do
{:ok, activity}
else
_e -> :error
end
end
def handle_incoming(
%{"type" => "Announce", "object" => object_id, "actor" => _actor, "id" => id} = data,
_options

6
lib/pleroma/web/common_api/common_api.ex
View File

@ -191,8 +191,10 @@ def unfavorite(id, user) do
def react_with_emoji(id, user, emoji) do
with %Activity{} = activity <- Activity.get_by_id(id),
object <- Object.normalize(activity) do
ActivityPub.react_with_emoji(user, object, emoji)
object <- Object.normalize(activity),
{:ok, emoji_react, _} <- Builder.emoji_react(user, object, emoji),
{:ok, activity, _} <- Pipeline.common_pipeline(emoji_react, local: true) do
{:ok, activity}
else
_ ->
{:error, dgettext("errors", "Could not add reaction emoji")}

2
lib/pleroma/web/pleroma_api/controllers/pleroma_api_controller.ex
View File

@ -86,7 +86,7 @@ def emoji_reactions_by(%{assigns: %{user: user}} = conn, %{"id" => activity_id}
end
def react_with_emoji(%{assigns: %{user: user}} = conn, %{"id" => activity_id, "emoji" => emoji}) do
with {:ok, _activity, _object} <- CommonAPI.react_with_emoji(activity_id, user, emoji),
with {:ok, _activity} <- CommonAPI.react_with_emoji(activity_id, user, emoji),
activity <- Activity.get_by_id(activity_id) do
conn
|> put_view(StatusView)

2
test/notification_test.exs
View File

@ -24,7 +24,7 @@ test "creates a notification for an emoji reaction" do
other_user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "yeah"})
{:ok, activity, _object} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
{:ok, activity} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
{:ok, [notification]} = Notification.create_notifications(activity)

66
test/web/activity_pub/activity_pub_test.exs
View File

@ -16,7 +16,6 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.AdminAPI.AccountView
alias Pleroma.Web.CommonAPI
alias Pleroma.Web.Federator
import ExUnit.CaptureLog
import Mock
@ -874,71 +873,6 @@ test "returns reblogs for users for whom reblogs have not been muted" do
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 "announcing an object" do
test "adds an announce activity to the db" do
note_activity = insert(:note_activity)

40
test/web/activity_pub/object_validator_test.exs
View File

@ -10,6 +10,46 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidatorTest do
import Pleroma.Factory
describe "EmojiReacts" do
setup do
user = insert(:user)
{:ok, post_activity} = CommonAPI.post(user, %{"status" => "uguu"})
object = Pleroma.Object.get_by_ap_id(post_activity.data["object"])
{:ok, valid_emoji_react, []} = Builder.emoji_react(user, object, "👌")
%{user: user, post_activity: post_activity, valid_emoji_react: valid_emoji_react}
end
test "it validates a valid EmojiReact", %{valid_emoji_react: valid_emoji_react} do
assert {:ok, _, _} = ObjectValidator.validate(valid_emoji_react, [])
end
test "it is not valid without a 'content' field", %{valid_emoji_react: valid_emoji_react} do
without_content =
valid_emoji_react
|> Map.delete("content")
{:error, cng} = ObjectValidator.validate(without_content, [])
refute cng.valid?
assert {:content, {"can't be blank", [validation: :required]}} in cng.errors
end
test "it is not valid with a non-emoji content field", %{valid_emoji_react: valid_emoji_react} do
without_emoji_content =
valid_emoji_react
|> Map.put("content", "x")
{:error, cng} = ObjectValidator.validate(without_emoji_content, [])
refute cng.valid?
assert {:content, {"must be a single character emoji", []}} in cng.errors
end
end
describe "Undos" do
setup do
user = insert(:user)

29
test/web/activity_pub/side_effects_test.exs
View File

@ -72,13 +72,40 @@ test "it handles user deletions", %{delete_user: delete, user: user} do
end
end
describe "EmojiReact objects" do
setup do
poster = insert(:user)
user = insert(:user)
{:ok, post} = CommonAPI.post(poster, %{"status" => "hey"})
{:ok, emoji_react_data, []} = Builder.emoji_react(user, post.object, "👌")
{:ok, emoji_react, _meta} = ActivityPub.persist(emoji_react_data, local: true)
%{emoji_react: emoji_react, user: user, poster: poster}
end
test "adds the reaction to the object", %{emoji_react: emoji_react, user: user} do
{:ok, emoji_react, _} = SideEffects.handle(emoji_react)
object = Object.get_by_ap_id(emoji_react.data["object"])
assert object.data["reaction_count"] == 1
assert ["👌", [user.ap_id]] in object.data["reactions"]
end
test "creates a notification", %{emoji_react: emoji_react, poster: poster} do
{:ok, emoji_react, _} = SideEffects.handle(emoji_react)
assert Repo.get_by(Notification, user_id: poster.id, activity_id: emoji_react.id)
end
end
describe "Undo objects" do
setup do
poster = insert(:user)
user = insert(:user)
{:ok, post} = CommonAPI.post(poster, %{"status" => "hey"})
{:ok, like} = CommonAPI.favorite(user, post.id)
{:ok, reaction, _} = CommonAPI.react_with_emoji(post.id, user, "👍")
{:ok, reaction} = CommonAPI.react_with_emoji(post.id, user, "👍")
{:ok, announce, _} = CommonAPI.repeat(post.id, user)
{:ok, block} = ActivityPub.block(user, poster)
User.block(user, poster)

61
test/web/activity_pub/transmogrifier/emoji_react_handling_test.exs Normal file
View File

@ -0,0 +1,61 @@
# 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.Transmogrifier.EmojiReactHandlingTest do
use Pleroma.DataCase
alias Pleroma.Activity
alias Pleroma.Object
alias Pleroma.Web.ActivityPub.Transmogrifier
alias Pleroma.Web.CommonAPI
import Pleroma.Factory
test "it works for incoming emoji reactions" do
user = insert(:user)
other_user = insert(:user, local: false)
{:ok, activity} = CommonAPI.post(user, %{"status" => "hello"})
data =
File.read!("test/fixtures/emoji-reaction.json")
|> Poison.decode!()
|> Map.put("object", activity.data["object"])
|> Map.put("actor", other_user.ap_id)
{:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
assert data["actor"] == other_user.ap_id
assert data["type"] == "EmojiReact"
assert data["id"] == "http://mastodon.example.org/users/admin#reactions/2"
assert data["object"] == activity.data["object"]
assert data["content"] == "👌"
object = Object.get_by_ap_id(data["object"])
assert object.data["reaction_count"] == 1
assert match?([["👌", _]], object.data["reactions"])
end
test "it reject invalid emoji reactions" do
user = insert(:user)
other_user = insert(:user, local: false)
{:ok, activity} = CommonAPI.post(user, %{"status" => "hello"})
data =
File.read!("test/fixtures/emoji-reaction-too-long.json")
|> Poison.decode!()
|> Map.put("object", activity.data["object"])
|> Map.put("actor", other_user.ap_id)
assert {:error, _} = Transmogrifier.handle_incoming(data)
data =
File.read!("test/fixtures/emoji-reaction-no-emoji.json")
|> Poison.decode!()
|> Map.put("object", activity.data["object"])
|> Map.put("actor", other_user.ap_id)
assert {:error, _} = Transmogrifier.handle_incoming(data)
end
end

2
test/web/activity_pub/transmogrifier/undo_handling_test.exs
View File

@ -17,7 +17,7 @@ test "it works for incoming emoji reaction undos" do
user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "hello"})
{:ok, reaction_activity, _object} = CommonAPI.react_with_emoji(activity.id, user, "👌")
{:ok, reaction_activity} = CommonAPI.react_with_emoji(activity.id, user, "👌")
data =
File.read!("test/fixtures/mastodon-undo-like.json")

39
test/web/activity_pub/transmogrifier_test.exs
View File

@ -325,43 +325,6 @@ test "it cleans up incoming notices which are not really DMs" do
assert object_data["cc"] == to
end
test "it works for incoming emoji reactions" do
user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "hello"})
data =
File.read!("test/fixtures/emoji-reaction.json")
|> Poison.decode!()
|> Map.put("object", activity.data["object"])
{:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
assert data["actor"] == "http://mastodon.example.org/users/admin"
assert data["type"] == "EmojiReact"
assert data["id"] == "http://mastodon.example.org/users/admin#reactions/2"
assert data["object"] == activity.data["object"]
assert data["content"] == "👌"
end
test "it reject invalid emoji reactions" do
user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "hello"})
data =
File.read!("test/fixtures/emoji-reaction-too-long.json")
|> Poison.decode!()
|> Map.put("object", activity.data["object"])
assert :error = Transmogrifier.handle_incoming(data)
data =
File.read!("test/fixtures/emoji-reaction-no-emoji.json")
|> Poison.decode!()
|> Map.put("object", activity.data["object"])
assert :error = Transmogrifier.handle_incoming(data)
end
test "it works for incoming announces" do
data = File.read!("test/fixtures/mastodon-announce.json") |> Poison.decode!()
@ -518,7 +481,7 @@ test "it strips internal likes" do
test "it strips internal reactions" do
user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "#cofe"})
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, user, "📢")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, user, "📢")
%{object: object} = Activity.get_by_id_with_object(activity.id)
assert Map.has_key?(object.data, "reactions")

4
test/web/common_api/common_api_test.exs
View File

@ -358,7 +358,7 @@ test "reacting to a status with an emoji" do
{:ok, activity} = CommonAPI.post(other_user, %{"status" => "cofe"})
{:ok, reaction, _} = CommonAPI.react_with_emoji(activity.id, user, "👍")
{:ok, reaction} = CommonAPI.react_with_emoji(activity.id, user, "👍")
assert reaction.data["actor"] == user.ap_id
assert reaction.data["content"] == "👍"
@ -373,7 +373,7 @@ test "unreacting to a status with an emoji" do
other_user = insert(:user)
{:ok, activity} = CommonAPI.post(other_user, %{"status" => "cofe"})
{:ok, reaction, _} = CommonAPI.react_with_emoji(activity.id, user, "👍")
{:ok, reaction} = CommonAPI.react_with_emoji(activity.id, user, "👍")
{:ok, unreaction} = CommonAPI.unreact_with_emoji(activity.id, user, "👍")

2
test/web/mastodon_api/views/notification_view_test.exs
View File

@ -156,7 +156,7 @@ test "EmojiReact notification" do
other_user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "#cofe"})
{:ok, _activity, _} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
{:ok, _activity} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
activity = Repo.get(Activity, activity.id)

6
test/web/mastodon_api/views/status_view_test.exs
View File

@ -32,9 +32,9 @@ test "has an emoji reaction list" do
third_user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "dae cofe??"})
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, user, "☕")
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, third_user, "🍵")
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, user, "☕")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, third_user, "🍵")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
activity = Repo.get(Activity, activity.id)
status = StatusView.render("show.json", activity: activity)

10
test/web/pleroma_api/controllers/pleroma_api_controller_test.exs
View File

@ -43,7 +43,7 @@ test "DELETE /api/v1/pleroma/statuses/:id/reactions/:emoji", %{conn: conn} do
other_user = insert(:user)
{:ok, activity} = CommonAPI.post(user, %{"status" => "#cofe"})
{:ok, _reaction, _object} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
{:ok, _reaction_activity} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
ObanHelpers.perform_all()
@ -77,8 +77,8 @@ test "GET /api/v1/pleroma/statuses/:id/reactions", %{conn: conn} do
assert result == []
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, other_user, "🎅")
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, doomed_user, "🎅")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, other_user, "🎅")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, doomed_user, "🎅")
User.perform(:delete, doomed_user)
@ -115,8 +115,8 @@ test "GET /api/v1/pleroma/statuses/:id/reactions/:emoji", %{conn: conn} do
assert result == []
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, other_user, "🎅")
{:ok, _, _} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, other_user, "🎅")
{:ok, _} = CommonAPI.react_with_emoji(activity.id, other_user, "☕")
result =
conn