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diff --git a/lib/pleroma/web/mastodon_api/mastodon_api.ex b/lib/pleroma/web/mastodon_api/mastodon_api.ex
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+++ b/lib/pleroma/web/mastodon_api/mastodon_api.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MastodonAPI.MastodonAPI do
+  import Ecto.Query
+  import Ecto.Changeset
+
+  alias Pleroma.Notification
+  alias Pleroma.Pagination
+  alias Pleroma.ScheduledActivity
+  alias Pleroma.User
+  alias Pleroma.Web.CommonAPI
+
+  @spec follow(User.t(), User.t(), map) :: {:ok, User.t()} | {:error, String.t()}
+  def follow(follower, followed, params \\ %{}) do
+    result =
+      if not User.following?(follower, followed) do
+        CommonAPI.follow(follower, followed)
+      else
+        {:ok, follower, followed, nil}
+      end
+
+    with {:ok, follower, _followed, _} <- result do
+      options = cast_params(params)
+      set_reblogs_visibility(options[:reblogs], result)
+      set_subscription(options[:notify], result)
+      {:ok, follower}
+    end
+  end
+
+  defp set_reblogs_visibility(false, {:ok, follower, followed, _}) do
+    CommonAPI.hide_reblogs(follower, followed)
+  end
+
+  defp set_reblogs_visibility(_, {:ok, follower, followed, _}) do
+    CommonAPI.show_reblogs(follower, followed)
+  end
+
+  defp set_subscription(true, {:ok, follower, followed, _}) do
+    User.subscribe(follower, followed)
+  end
+
+  defp set_subscription(false, {:ok, follower, followed, _}) do
+    User.unsubscribe(follower, followed)
+  end
+
+  defp set_subscription(_, _), do: {:ok, nil}
+
+  @spec get_followers(User.t(), map()) :: list(User.t())
+  def get_followers(user, params \\ %{}) do
+    user
+    |> User.get_followers_query()
+    |> Pagination.fetch_paginated(params)
+  end
+
+  def get_friends(user, params \\ %{}) do
+    user
+    |> User.get_friends_query()
+    |> Pagination.fetch_paginated(params)
+  end
+
+  def get_notifications(user, params \\ %{}) do
+    options =
+      cast_params(params) |> Map.update(:include_types, [], fn include_types -> include_types end)
+
+    options =
+      if ("pleroma:report" not in options.include_types and
+            User.privileged?(user, :reports_manage_reports)) or
+           User.privileged?(user, :reports_manage_reports) do
+        options
+      else
+        options
+        |> Map.update(:exclude_types, ["pleroma:report"], fn current_exclude_types ->
+          current_exclude_types ++ ["pleroma:report"]
+        end)
+      end
+
+    user
+    |> Notification.for_user_query(options)
+    |> restrict(:types, options)
+    |> restrict(:exclude_types, options)
+    |> restrict(:account_ap_id, options)
+    |> Pagination.fetch_paginated(params)
+  end
+
+  def get_scheduled_activities(user, params \\ %{}) do
+    user
+    |> ScheduledActivity.for_user_query()
+    |> Pagination.fetch_paginated(params)
+  end
+
+  defp cast_params(params) do
+    param_types = %{
+      exclude_types: {:array, :string},
+      types: {:array, :string},
+      exclude_visibilities: {:array, :string},
+      reblogs: :boolean,
+      with_muted: :boolean,
+      account_ap_id: :string,
+      notify: :boolean
+    }
+
+    changeset = cast({%{}, param_types}, params, Map.keys(param_types))
+    changeset.changes
+  end
+
+  defp restrict(query, :types, %{types: mastodon_types = [_ | _]}) do
+    where(query, [n], n.type in ^mastodon_types)
+  end
+
+  defp restrict(query, :exclude_types, %{exclude_types: mastodon_types = [_ | _]}) do
+    where(query, [n], n.type not in ^mastodon_types)
+  end
+
+  defp restrict(query, :account_ap_id, %{account_ap_id: account_ap_id}) do
+    where(query, [n, a], a.actor == ^account_ap_id)
+  end
+
+  defp restrict(query, _, _), do: query
+end