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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.Gun.Conn do
alias Pleroma.Gun
require Logger
def open(%URI{} = uri, opts) do
pool_opts = Pleroma.Config.get([:connections_pool], [])
opts =
opts
|> Enum.into(%{})
|> Map.put_new(:connect_timeout, pool_opts[:connect_timeout] || 5_000)
|> Map.put_new(:supervise, false)
|> maybe_add_tls_opts(uri)
do_open(uri, opts)
end
defp maybe_add_tls_opts(opts, %URI{scheme: "http"}), do: opts
defp maybe_add_tls_opts(opts, %URI{scheme: "https"}) do
tls_opts = [
verify: :verify_peer,
cacertfile: CAStore.file_path(),
depth: 20,
reuse_sessions: false,
log_level: :warning,
customize_hostname_check: [match_fun: :public_key.pkix_verify_hostname_match_fun(:https)]
]
tls_opts =
if Keyword.keyword?(opts[:tls_opts]) do
Keyword.merge(tls_opts, opts[:tls_opts])
else
tls_opts
end
Map.put(opts, :tls_opts, tls_opts)
end
defp do_open(uri, %{proxy: {proxy_host, proxy_port}} = opts) do
connect_opts =
uri
|> destination_opts()
|> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, []))
with open_opts <- Map.delete(opts, :tls_opts),
{:ok, conn} <- Gun.open(proxy_host, proxy_port, open_opts),
{:ok, protocol} <- Gun.await_up(conn, opts[:connect_timeout]),
stream <- Gun.connect(conn, connect_opts),
{:response, :fin, 200, _} <- Gun.await(conn, stream) do
{:ok, conn, protocol}
else
error ->
Logger.warning(
"Opening proxied connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}"
)
error
end
end
defp do_open(uri, %{proxy: {proxy_type, proxy_host, proxy_port}} = opts) do
version =
proxy_type
|> to_string()
|> String.last()
|> case do
"4" -> 4
_ -> 5
end
socks_opts =
uri
|> destination_opts()
|> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, []))
|> Map.put(:version, version)
opts =
opts
|> Map.put(:protocols, [:socks])
|> Map.put(:socks_opts, socks_opts)
with {:ok, conn} <- Gun.open(proxy_host, proxy_port, opts),
{:ok, protocol} <- Gun.await_up(conn, opts[:connect_timeout]) do
{:ok, conn, protocol}
else
error ->
Logger.warning(
"Opening socks proxied connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}"
)
error
end
end
defp do_open(%URI{host: host, port: port} = uri, opts) do
host = Pleroma.HTTP.AdapterHelper.parse_host(host)
with {:ok, conn} <- Gun.open(host, port, opts),
{:ok, protocol} <- Gun.await_up(conn, opts[:connect_timeout]) do
{:ok, conn, protocol}
else
error ->
Logger.warning(
"Opening connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}"
)
error
end
end
defp destination_opts(%URI{host: host, port: port}) do
host = Pleroma.HTTP.AdapterHelper.parse_host(host)
%{host: host, port: port}
end
defp add_http2_opts(opts, "https", tls_opts) do
Map.merge(opts, %{protocols: [:http2], transport: :tls, tls_opts: tls_opts})
end
defp add_http2_opts(opts, _, _), do: opts
def compose_uri_log(%URI{scheme: scheme, host: host, path: path}) do
"#{scheme}://#{host}#{path}"
end
end

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