git.squeep.com Git - akkoma/blob - lib/pleroma/web/twitter_api/controllers/remote_follow_controller.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.TwitterAPI.RemoteFollowController do
   6   use Pleroma.Web, :controller
   7
   8   require Logger
   9
  10   alias Pleroma.Activity
  11   alias Pleroma.Object.Fetcher
  12   alias Pleroma.Plugs.OAuthScopesPlug
  13   alias Pleroma.User
  14   alias Pleroma.Web.Auth.Authenticator
  15   alias Pleroma.Web.CommonAPI
  16
  17   @status_types ["Article", "Event", "Note", "Video", "Page", "Question"]
  18
  19   # Note: follower can submit the form (with password auth) not being signed in (having no token)
  20   plug(
  21     OAuthScopesPlug,
  22     %{fallback: :proceed_unauthenticated, scopes: ["follow", "write:follows"]}
  23     when action in [:do_follow]
  24   )
  25
  26   # GET /ostatus_subscribe
  27   #
  28   def follow(%{assigns: %{user: user}} = conn, %{"acct" => acct}) do
  29     case is_status?(acct) do
  30       true -> follow_status(conn, user, acct)
  31       _ -> follow_account(conn, user, acct)
  32     end
  33   end
  34
  35   defp follow_status(conn, _user, acct) do
  36     with {:ok, object} <- Fetcher.fetch_object_from_id(acct),
  37          %Activity{id: activity_id} <- Activity.get_create_by_object_ap_id(object.data["id"]) do
  38       redirect(conn, to: o_status_path(conn, :notice, activity_id))
  39     else
  40       error ->
  41         handle_follow_error(conn, error)
  42     end
  43   end
  44
  45   defp follow_account(conn, user, acct) do
  46     with {:ok, followee} <- User.get_or_fetch(acct) do
  47       render(conn, follow_template(user), %{error: false, followee: followee, acct: acct})
  48     else
  49       {:error, _reason} ->
  50         render(conn, follow_template(user), %{error: :error})
  51     end
  52   end
  53
  54   defp follow_template(%User{} = _user), do: "follow.html"
  55   defp follow_template(_), do: "follow_login.html"
  56
  57   defp is_status?(acct) do
  58     case Fetcher.fetch_and_contain_remote_object_from_id(acct) do
  59       {:ok, %{"type" => type}} when type in @status_types ->
  60         true
  61
  62       _ ->
  63         false
  64     end
  65   end
  66
  67   # POST  /ostatus_subscribe
  68   #
  69   def do_follow(%{assigns: %{user: %User{} = user}} = conn, %{"user" => %{"id" => id}}) do
  70     with {:fetch_user, %User{} = followee} <- {:fetch_user, User.get_cached_by_id(id)},
  71          {:ok, _, _, _} <- CommonAPI.follow(user, followee) do
  72       redirect(conn, to: "/users/#{followee.id}")
  73     else
  74       error ->
  75         handle_follow_error(conn, error)
  76     end
  77   end
  78
  79   def do_follow(conn, %{"authorization" => %{"name" => _, "password" => _, "id" => id}}) do
  80     with {:fetch_user, %User{} = followee} <- {:fetch_user, User.get_cached_by_id(id)},
  81          {_, {:ok, user}, _} <- {:auth, Authenticator.get_user(conn), followee},
  82          {:ok, _, _, _} <- CommonAPI.follow(user, followee) do
  83       redirect(conn, to: "/users/#{followee.id}")
  84     else
  85       error ->
  86         handle_follow_error(conn, error)
  87     end
  88   end
  89
  90   def do_follow(%{assigns: %{user: nil}} = conn, _) do
  91     Logger.debug("Insufficient permissions: follow | write:follows.")
  92     render(conn, "followed.html", %{error: "Insufficient permissions: follow | write:follows."})
  93   end
  94
  95   defp handle_follow_error(conn, {:auth, _, followee} = _) do
  96     render(conn, "follow_login.html", %{error: "Wrong username or password", followee: followee})
  97   end
  98
  99   defp handle_follow_error(conn, {:fetch_user, error} = _) do
 100     Logger.debug("Remote follow failed with error #{inspect(error)}")
 101     render(conn, "followed.html", %{error: "Could not find user"})
 102   end
 103
 104   defp handle_follow_error(conn, {:error, "Could not follow user:" <> _} = _) do
 105     render(conn, "followed.html", %{error: "Error following account"})
 106   end
 107
 108   defp handle_follow_error(conn, error) do
 109     Logger.debug("Remote follow failed with error #{inspect(error)}")
 110     render(conn, "followed.html", %{error: "Something went wrong."})
 111   end
 112 end