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   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.Gopher.Server do
   6   use GenServer
   7   require Logger
   8
   9   def start_link(_) do
  10     config = Pleroma.Config.get(:gopher, [])
  11     ip = Keyword.get(config, :ip, {0, 0, 0, 0})
  12     port = Keyword.get(config, :port, 1234)
  13
  14     if Keyword.get(config, :enabled, false) do
  15       GenServer.start_link(__MODULE__, [ip, port], [])
  16     else
  17       Logger.info("Gopher server disabled")
  18       :ignore
  19     end
  20   end
  21
  22   def init([ip, port]) do
  23     Logger.info("Starting gopher server on #{port}")
  24
  25     :ranch.start_listener(
  26       :gopher,
  27       100,
  28       :ranch_tcp,
  29       [ip: ip, port: port],
  30       __MODULE__.ProtocolHandler,
  31       []
  32     )
  33
  34     {:ok, %{ip: ip, port: port}}
  35   end
  36 end
  37
  38 defmodule Pleroma.Gopher.Server.ProtocolHandler do
  39   alias Pleroma.Activity
  40   alias Pleroma.HTML
  41   alias Pleroma.Object
  42   alias Pleroma.User
  43   alias Pleroma.Web.ActivityPub.ActivityPub
  44   alias Pleroma.Web.ActivityPub.Visibility
  45
  46   def start_link(ref, socket, transport, opts) do
  47     pid = spawn_link(__MODULE__, :init, [ref, socket, transport, opts])
  48     {:ok, pid}
  49   end
  50
  51   def init(ref, socket, transport, [] = _Opts) do
  52     :ok = :ranch.accept_ack(ref)
  53     loop(socket, transport)
  54   end
  55
  56   def info(text) do
  57     text = String.replace(text, ~r/[\t\n]/, "")
  58
  59     String.split(text, "\r")
  60     |> Enum.map(fn text ->
  61       "i#{text}\tfake\t(NULL)\t0\r\n"
  62     end)
  63     |> Enum.join("")
  64   end
  65
  66   def link(name, selector, type \\ 1) do
  67     address = Pleroma.Web.Endpoint.host()
  68     port = Pleroma.Config.get([:gopher, :port], 1234)
  69     dstport = Pleroma.Config.get([:gopher, :dstport], port)
  70     "#{type}#{name}\t#{selector}\t#{address}\t#{dstport}\r\n"
  71   end
  72
  73   def render_activities(activities) do
  74     activities
  75     |> Enum.reverse()
  76     |> Enum.map(fn activity ->
  77       user = User.get_cached_by_ap_id(activity.data["actor"])
  78
  79       object = Object.normalize(activity)
  80       like_count = object.data["like_count"] || 0
  81       announcement_count = object.data["announcement_count"] || 0
  82
  83       link("Post ##{activity.id} by #{user.nickname}", "/notices/#{activity.id}") <>
  84         info("#{like_count} likes, #{announcement_count} repeats") <>
  85         "i\tfake\t(NULL)\t0\r\n" <>
  86         info(HTML.strip_tags(String.replace(object.data["content"], "<br>", "\r")))
  87     end)
  88     |> Enum.join("i\tfake\t(NULL)\t0\r\n")
  89   end
  90
  91   def response("") do
  92     info("Welcome to #{Pleroma.Config.get([:instance, :name], "Pleroma")}!") <>
  93       link("Public Timeline", "/main/public") <>
  94       link("Federated Timeline", "/main/all") <> ".\r\n"
  95   end
  96
  97   def response("/main/public") do
  98     posts =
  99       %{type: ["Create"], local_only: true}
 100       |> ActivityPub.fetch_public_activities()
 101       |> render_activities()
 102
 103     info("Welcome to the Public Timeline!") <> posts <> ".\r\n"
 104   end
 105
 106   def response("/main/all") do
 107     posts =
 108       %{type: ["Create"]}
 109       |> ActivityPub.fetch_public_activities()
 110       |> render_activities()
 111
 112     info("Welcome to the Federated Timeline!") <> posts <> ".\r\n"
 113   end
 114
 115   def response("/notices/" <> id) do
 116     with %Activity{} = activity <- Activity.get_by_id(id),
 117          true <- Visibility.is_public?(activity) do
 118       activities =
 119         ActivityPub.fetch_activities_for_context(activity.data["context"])
 120         |> render_activities
 121
 122       user = User.get_cached_by_ap_id(activity.data["actor"])
 123
 124       info("Post #{activity.id} by #{user.nickname}") <>
 125         link("More posts by #{user.nickname}", "/users/#{user.nickname}") <> activities <> ".\r\n"
 126     else
 127       _e ->
 128         info("Not public") <> ".\r\n"
 129     end
 130   end
 131
 132   def response("/users/" <> nickname) do
 133     with %User{} = user <- User.get_cached_by_nickname(nickname) do
 134       params = %{
 135         type: ["Create"],
 136         actor_id: user.ap_id
 137       }
 138
 139       activities =
 140         params
 141         |> ActivityPub.fetch_public_activities()
 142         |> render_activities()
 143
 144       info("Posts by #{user.nickname}") <> activities <> ".\r\n"
 145     else
 146       _e ->
 147         info("No such user") <> ".\r\n"
 148     end
 149   end
 150
 151   def loop(socket, transport) do
 152     case transport.recv(socket, 0, 5000) do
 153       {:ok, data} ->
 154         data = String.trim_trailing(data, "\r\n")
 155         transport.send(socket, response(data))
 156         :ok = transport.close(socket)
 157
 158       _ ->
 159         :ok = transport.close(socket)
 160     end
 161   end
 162 end