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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 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