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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.HTTP.AdapterHelper do
@moduledoc """
Configure Tesla.Client with default and customized adapter options.
"""
@defaults [pool: :federation]
@type proxy_type() :: :socks4 | :socks5
@type host() :: charlist() | :inet.ip_address()
alias Pleroma.Config
alias Pleroma.HTTP.AdapterHelper
require Logger
@type proxy ::
{Connection.host(), pos_integer()}
| {Connection.proxy_type(), Connection.host(), pos_integer()}
@callback options(keyword(), URI.t()) :: keyword()
@callback get_conn(URI.t(), keyword()) :: {:ok, term()} | {:error, term()}
@spec format_proxy(String.t() | tuple() | nil) :: proxy() | nil
def format_proxy(nil), do: nil
def format_proxy(proxy_url) do
case parse_proxy(proxy_url) do
{:ok, host, port} -> {host, port}
{:ok, type, host, port} -> {type, host, port}
_ -> nil
end
end
@spec maybe_add_proxy(keyword(), proxy() | nil) :: keyword()
def maybe_add_proxy(opts, nil), do: opts
def maybe_add_proxy(opts, proxy), do: Keyword.put_new(opts, :proxy, proxy)
@doc """
Merge default connection & adapter options with received ones.
"""
@spec options(URI.t(), keyword()) :: keyword()
def options(%URI{} = uri, opts \\ []) do
@defaults
|> put_timeout()
|> Keyword.merge(opts)
|> adapter_helper().options(uri)
end
# For Hackney, this is the time a connection can stay idle in the pool.
# For Gun, this is the timeout to receive a message from Gun.
defp put_timeout(opts) do
{config_key, default} =
if adapter() == Tesla.Adapter.Gun do
{:pools, Config.get([:pools, :default, :timeout], 5_000)}
else
{:hackney_pools, 10_000}
end
timeout = Config.get([config_key, opts[:pool], :timeout], default)
Keyword.merge(opts, timeout: timeout)
end
def get_conn(uri, opts), do: adapter_helper().get_conn(uri, opts)
defp adapter, do: Application.get_env(:tesla, :adapter)
defp adapter_helper do
case adapter() do
Tesla.Adapter.Gun -> AdapterHelper.Gun
Tesla.Adapter.Hackney -> AdapterHelper.Hackney
_ -> AdapterHelper.Default
end
end
@spec parse_proxy(String.t() | tuple() | nil) ::
{:ok, host(), pos_integer()}
| {:ok, proxy_type(), host(), pos_integer()}
| {:error, atom()}
| nil
def parse_proxy(nil), do: nil
def parse_proxy(proxy) when is_binary(proxy) do
with [host, port] <- String.split(proxy, ":"),
{port, ""} <- Integer.parse(port) do
{:ok, parse_host(host), port}
else
{_, _} ->
Logger.warn("Parsing port failed #{inspect(proxy)}")
{:error, :invalid_proxy_port}
:error ->
Logger.warn("Parsing port failed #{inspect(proxy)}")
{:error, :invalid_proxy_port}
_ ->
Logger.warn("Parsing proxy failed #{inspect(proxy)}")
{:error, :invalid_proxy}
end
end
def parse_proxy(proxy) when is_tuple(proxy) do
with {type, host, port} <- proxy do
{:ok, type, parse_host(host), port}
else
_ ->
Logger.warn("Parsing proxy failed #{inspect(proxy)}")
{:error, :invalid_proxy}
end
end
@spec parse_host(String.t() | atom() | charlist()) :: charlist() | :inet.ip_address()
def parse_host(host) when is_list(host), do: host
def parse_host(host) when is_atom(host), do: to_charlist(host)
def parse_host(host) when is_binary(host) do
host = to_charlist(host)
case :inet.parse_address(host) do
{:error, :einval} -> host
{:ok, ip} -> ip
end
end
@spec format_host(String.t()) :: charlist()
def format_host(host) do
host_charlist = to_charlist(host)
case :inet.parse_address(host_charlist) do
{:error, :einval} ->
:idna.encode(host_charlist)
{:ok, _ip} ->
host_charlist
end
end
end

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