# Pleroma: A lightweight social networking server # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Gopher.Server do use GenServer require Logger def start_link(_) do config = Pleroma.Config.get(:gopher, []) ip = Keyword.get(config, :ip, {0, 0, 0, 0}) port = Keyword.get(config, :port, 1234) if Keyword.get(config, :enabled, false) do GenServer.start_link(__MODULE__, [ip, port], []) else Logger.info("Gopher server disabled") :ignore end end def init([ip, port]) do Logger.info("Starting gopher server on #{port}") :ranch.start_listener( :gopher, 100, :ranch_tcp, [ip: ip, port: port], __MODULE__.ProtocolHandler, [] ) {:ok, %{ip: ip, port: port}} end end defmodule Pleroma.Gopher.Server.ProtocolHandler do alias Pleroma.Activity alias Pleroma.HTML alias Pleroma.Object alias Pleroma.User alias Pleroma.Web.ActivityPub.ActivityPub alias Pleroma.Web.ActivityPub.Visibility def start_link(ref, socket, transport, opts) do pid = spawn_link(__MODULE__, :init, [ref, socket, transport, opts]) {:ok, pid} end def init(ref, socket, transport, [] = _Opts) do :ok = :ranch.accept_ack(ref) loop(socket, transport) end def info(text) do text = String.replace(text, ~r/[\t\n]/, "") String.split(text, "\r") |> Enum.map(fn text -> "i#{text}\tfake\t(NULL)\t0\r\n" end) |> Enum.join("") end def link(name, selector, type \\ 1) do address = Pleroma.Web.Endpoint.host() port = Pleroma.Config.get([:gopher, :port], 1234) dstport = Pleroma.Config.get([:gopher, :dstport], port) "#{type}#{name}\t#{selector}\t#{address}\t#{dstport}\r\n" end def render_activities(activities) do activities |> Enum.reverse() |> Enum.map(fn activity -> user = User.get_cached_by_ap_id(activity.data["actor"]) object = Object.normalize(activity, fetch: false) like_count = object.data["like_count"] || 0 announcement_count = object.data["announcement_count"] || 0 link("Post ##{activity.id} by #{user.nickname}", "/notices/#{activity.id}") <> info("#{like_count} likes, #{announcement_count} repeats") <> "i\tfake\t(NULL)\t0\r\n" <> info(HTML.strip_tags(String.replace(object.data["content"], "<br>", "\r"))) end) |> Enum.join("i\tfake\t(NULL)\t0\r\n") end def response("") do info("Welcome to #{Pleroma.Config.get([:instance, :name], "Pleroma")}!") <> link("Public Timeline", "/main/public") <> link("Federated Timeline", "/main/all") <> ".\r\n" end def response("/main/public") do posts = %{type: ["Create"], local_only: true} |> ActivityPub.fetch_public_activities() |> render_activities() info("Welcome to the Public Timeline!") <> posts <> ".\r\n" end def response("/main/all") do posts = %{type: ["Create"]} |> ActivityPub.fetch_public_activities() |> render_activities() info("Welcome to the Federated Timeline!") <> posts <> ".\r\n" end def response("/notices/" <> id) do with %Activity{} = activity <- Activity.get_by_id(id), true <- Visibility.is_public?(activity) do activities = ActivityPub.fetch_activities_for_context(activity.data["context"]) |> render_activities user = User.get_cached_by_ap_id(activity.data["actor"]) info("Post #{activity.id} by #{user.nickname}") <> link("More posts by #{user.nickname}", "/users/#{user.nickname}") <> activities <> ".\r\n" else _e -> info("Not public") <> ".\r\n" end end def response("/users/" <> nickname) do with %User{} = user <- User.get_cached_by_nickname(nickname) do params = %{ type: ["Create"], actor_id: user.ap_id } activities = params |> ActivityPub.fetch_public_activities() |> render_activities() info("Posts by #{user.nickname}") <> activities <> ".\r\n" else _e -> info("No such user") <> ".\r\n" end end def loop(socket, transport) do case transport.recv(socket, 0, 5000) do {:ok, data} -> data = String.trim_trailing(data, "\r\n") transport.send(socket, response(data)) :ok = transport.close(socket) _ -> :ok = transport.close(socket) end end end