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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.BBS.Handler do
   6   use Sshd.ShellHandler
   7   alias Pleroma.Activity
   8   alias Pleroma.HTML
   9   alias Pleroma.Web.ActivityPub.ActivityPub
  10   alias Pleroma.Web.CommonAPI
  11
  12   def on_shell(username, _pubkey, _ip, _port) do
  13     :ok = IO.puts("Welcome to #{Pleroma.Config.get([:instance, :name])}!")
  14     user = Pleroma.User.get_cached_by_nickname(to_string(username))
  15     Logger.debug("#{inspect(user)}")
  16     loop(run_state(user: user))
  17   end
  18
  19   def on_connect(username, ip, port, method) do
  20     Logger.debug(fn ->
  21       """
  22       Incoming SSH shell #{inspect(self())} requested for #{username} from #{inspect(ip)}:#{
  23         inspect(port)
  24       } using #{inspect(method)}
  25       """
  26     end)
  27   end
  28
  29   def on_disconnect(username, ip, port) do
  30     Logger.debug(fn ->
  31       "Disconnecting SSH shell for #{username} from #{inspect(ip)}:#{inspect(port)}"
  32     end)
  33   end
  34
  35   defp loop(state) do
  36     self_pid = self()
  37     counter = state.counter
  38     prefix = state.prefix
  39     user = state.user
  40
  41     input = spawn(fn -> io_get(self_pid, prefix, counter, user.nickname) end)
  42     wait_input(state, input)
  43   end
  44
  45   def puts_activity(activity) do
  46     status = Pleroma.Web.MastodonAPI.StatusView.render("show.json", %{activity: activity})
  47     IO.puts("-- #{status.id} by #{status.account.display_name} (#{status.account.acct})")
  48     IO.puts(HTML.strip_tags(status.content))
  49     IO.puts("")
  50   end
  51
  52   def handle_command(state, "help") do
  53     IO.puts("Available commands:")
  54     IO.puts("help - This help")
  55     IO.puts("home - Show the home timeline")
  56     IO.puts("p <text> - Post the given text")
  57     IO.puts("r <id> <text> - Reply to the post with the given id")
  58     IO.puts("quit - Quit")
  59
  60     state
  61   end
  62
  63   def handle_command(%{user: user} = state, "r " <> text) do
  64     text = String.trim(text)
  65     [activity_id, rest] = String.split(text, " ", parts: 2)
  66
  67     with %Activity{} <- Activity.get_by_id(activity_id),
  68          {:ok, _activity} <-
  69            CommonAPI.post(user, %{status: rest, in_reply_to_status_id: activity_id}) do
  70       IO.puts("Replied!")
  71     else
  72       _e -> IO.puts("Could not reply...")
  73     end
  74
  75     state
  76   end
  77
  78   def handle_command(%{user: user} = state, "p " <> text) do
  79     text = String.trim(text)
  80
  81     with {:ok, _activity} <- CommonAPI.post(user, %{status: text}) do
  82       IO.puts("Posted!")
  83     else
  84       _e -> IO.puts("Could not post...")
  85     end
  86
  87     state
  88   end
  89
  90   def handle_command(state, "home") do
  91     user = state.user
  92
  93     params =
  94       %{}
  95       |> Map.put(:type, ["Create"])
  96       |> Map.put(:blocking_user, user)
  97       |> Map.put(:muting_user, user)
  98       |> Map.put(:user, user)
  99
 100     activities =
 101       [user.ap_id | Pleroma.User.following(user)]
 102       |> ActivityPub.fetch_activities(params)
 103
 104     Enum.each(activities, fn activity ->
 105       puts_activity(activity)
 106     end)
 107
 108     state
 109   end
 110
 111   def handle_command(state, command) do
 112     IO.puts("Unknown command '#{command}'")
 113     state
 114   end
 115
 116   defp wait_input(state, input) do
 117     receive do
 118       {:input, ^input, "quit\n"} ->
 119         IO.puts("Exiting...")
 120
 121       {:input, ^input, code} when is_binary(code) ->
 122         code = String.trim(code)
 123
 124         state = handle_command(state, code)
 125
 126         loop(%{state | counter: state.counter + 1})
 127
 128       {:error, :interrupted} ->
 129         IO.puts("Caught Ctrl+C...")
 130         loop(%{state | counter: state.counter + 1})
 131
 132       {:input, ^input, msg} ->
 133         :ok = Logger.warn("received unknown message: #{inspect(msg)}")
 134         loop(%{state | counter: state.counter + 1})
 135     end
 136   end
 137
 138   defp run_state(opts) do
 139     %{prefix: "pleroma", counter: 1, user: opts[:user]}
 140   end
 141
 142   defp io_get(pid, prefix, counter, username) do
 143     prompt = prompt(prefix, counter, username)
 144     send(pid, {:input, self(), IO.gets(:stdio, prompt)})
 145   end
 146
 147   defp prompt(prefix, counter, username) do
 148     prompt = "#{username}@#{prefix}:#{counter}>"
 149     prompt <> " "
 150   end
 151 end