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diff --git a/lib/pleroma/web/pleroma_api/controllers/emoji_reaction_controller.ex b/lib/pleroma/web/pleroma_api/controllers/emoji_reaction_controller.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.PleromaAPI.EmojiReactionController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.Activity
+  alias Pleroma.Object
+  alias Pleroma.Plugs.OAuthScopesPlug
+  alias Pleroma.Web.CommonAPI
+  alias Pleroma.Web.MastodonAPI.StatusView
+
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
+  plug(OAuthScopesPlug, %{scopes: ["write:statuses"]} when action in [:create, :delete])
+
+  plug(
+    OAuthScopesPlug,
+    %{scopes: ["read:statuses"], fallback: :proceed_unauthenticated}
+    when action == :index
+  )
+
+  defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.EmojiReactionOperation
+
+  action_fallback(Pleroma.Web.MastodonAPI.FallbackController)
+
+  def index(%{assigns: %{user: user}} = conn, %{id: activity_id} = params) do
+    with true <- Pleroma.Config.get([:instance, :show_reactions]),
+         %Activity{} = activity <- Activity.get_by_id_with_object(activity_id),
+         %Object{data: %{"reactions" => reactions}} when is_list(reactions) <-
+           Object.normalize(activity) do
+      reactions = filter(reactions, params)
+      render(conn, "index.json", emoji_reactions: reactions, user: user)
+    else
+      _e -> json(conn, [])
+    end
+  end
+
+  defp filter(reactions, %{emoji: emoji}) when is_binary(emoji) do
+    Enum.filter(reactions, fn [e, _] -> e == emoji end)
+  end
+
+  defp filter(reactions, _), do: reactions
+
+  def create(%{assigns: %{user: user}} = conn, %{id: activity_id, emoji: emoji}) do
+    with {:ok, _activity} <- CommonAPI.react_with_emoji(activity_id, user, emoji) do
+      activity = Activity.get_by_id(activity_id)
+
+      conn
+      |> put_view(StatusView)
+      |> render("show.json", activity: activity, for: user, as: :activity)
+    end
+  end
+
+  def delete(%{assigns: %{user: user}} = conn, %{id: activity_id, emoji: emoji}) do
+    with {:ok, _activity} <- CommonAPI.unreact_with_emoji(activity_id, user, emoji) do
+      activity = Activity.get_by_id(activity_id)
+
+      conn
+      |> put_view(StatusView)
+      |> render("show.json", activity: activity, for: user, as: :activity)
+    end
+  end
+end