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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}")
{:ok, _pid} =
:ranch.start_listener(
:gopher,
:ranch_tcp,
%{
num_acceptors: 100,
max_connections: 100,
socket_opts: [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, transport, opts) do
pid = spawn_link(__MODULE__, :init, [ref, transport, opts])
{:ok, pid}
end
def init(ref, transport, opts \\ []) do
{:ok, socket} = :ranch.handshake(ref, opts)
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.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

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