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diff --git a/lib/pleroma/web/controllers/frontend/mastodon_controller.ex b/lib/pleroma/web/controllers/frontend/mastodon_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.Frontend.MastodonController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.Plugs.OAuthScopesPlug
+  alias Pleroma.User
+
+  plug(OAuthScopesPlug, %{scopes: ["write:accounts"]} when action == :put_settings)
+
+  # Note: :index action handles attempt of unauthenticated access to private instance with redirect
+  plug(
+    OAuthScopesPlug,
+    %{scopes: ["read"], fallback: :proceed_unauthenticated, skip_instance_privacy_check: true}
+    when action == :index
+  )
+
+  plug(Pleroma.Plugs.EnsurePublicOrAuthenticatedPlug when action != :index)
+
+  def index(%{assigns: %{user: user, token: token}} = conn, _params)
+      when not is_nil(user) and not is_nil(token) do
+    conn
+    |> put_layout(false)
+    |> render("index.html",
+      token: token.token,
+      user: user,
+      custom_emojis: Pleroma.Emoji.get_all()
+    )
+  end
+
+  def index(conn, _params) do
+    conn
+    |> put_session(:return_to, conn.request_path)
+    |> redirect(to: auth_path(conn, :login))
+  end
+
+  @doc "GET /web/manifest.json"
+  def manifest(conn, _params) do
+    render(conn, "manifest.json")
+  end
+
+  @doc "PUT /api/web/settings"
+  def put_settings(%{assigns: %{user: user}} = conn, %{"data" => settings} = _params) do
+    case User.mastodon_settings_update(user, settings) do
+      {:ok, _} ->
+        json(conn, %{})
+
+      e ->
+        conn
+        |> put_status(:internal_server_error)
+        |> json(%{error: inspect(e)})
+    end
+  end
+end