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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Config.Converter do
@moduledoc """
Converts json structures into elixir structures and types and vice versa.
"""
@spec to_elixir_types(boolean() | String.t() | map() | list()) :: term()
def to_elixir_types(%{"tuple" => [":args", args]}) when is_list(args) do
arguments =
Enum.map(args, fn arg ->
if String.contains?(arg, ["{", "}"]) do
{elem, []} = Code.eval_string(arg)
elem
else
to_elixir_types(arg)
end
end)
{:args, arguments}
end
def to_elixir_types(%{"tuple" => [":proxy_url", %{"tuple" => [type, host, port]}]}) do
{:proxy_url, {string_to_elixir_types!(type), parse_host(host), port}}
end
def to_elixir_types(%{"tuple" => [":partial_chain", entity]}) do
{partial_chain, []} =
entity
|> String.replace(~r/[^\w|^{:,[|^,|^[|^\]^}|^\/|^\.|^"]^\s/, "")
|> Code.eval_string()
{:partial_chain, partial_chain}
end
def to_elixir_types(%{"tuple" => entity}) do
Enum.reduce(entity, {}, &Tuple.append(&2, to_elixir_types(&1)))
end
def to_elixir_types(entity) when is_map(entity) do
Map.new(entity, fn {k, v} -> {to_elixir_types(k), to_elixir_types(v)} end)
end
def to_elixir_types(entity) when is_list(entity) do
Enum.map(entity, &to_elixir_types/1)
end
def to_elixir_types(entity) when is_binary(entity) do
entity
|> String.trim()
|> string_to_elixir_types!()
end
def to_elixir_types(entity), do: entity
defp parse_host("localhost"), do: :localhost
defp parse_host(host) do
charlist = to_charlist(host)
case :inet.parse_address(charlist) do
{:error, :einval} ->
charlist
{:ok, ip} ->
ip
end
end
@spec string_to_elixir_types!(String.t()) ::
atom() | Regex.t() | module() | String.t() | no_return()
def string_to_elixir_types!("~r" <> _pattern = regex) do
pattern =
~r/^~r(?'delimiter'[\/|"'([{<]{1})(?'pattern'.+)[\/|"')\]}>]{1}(?'modifier'[uismxfU]*)/u
delimiters = ["/", "|", "\"", "'", {"(", ")"}, {"[", "]"}, {"{", "}"}, {"<", ">"}]
with %{"modifier" => modifier, "pattern" => pattern, "delimiter" => regex_delimiter} <-
Regex.named_captures(pattern, regex),
{:ok, {leading, closing}} <- find_valid_delimiter(delimiters, pattern, regex_delimiter),
{result, _} <- Code.eval_string("~r#{leading}#{pattern}#{closing}#{modifier}") do
result
end
end
def string_to_elixir_types!(":" <> atom), do: String.to_atom(atom)
def string_to_elixir_types!(value) do
if module_name?(value) do
String.to_existing_atom("Elixir." <> value)
else
value
end
end
defp find_valid_delimiter([], _string, _) do
raise(ArgumentError, message: "valid delimiter for Regex expression not found")
end
defp find_valid_delimiter([{leading, closing} = delimiter | others], pattern, regex_delimiter)
when is_tuple(delimiter) do
if String.contains?(pattern, closing) do
find_valid_delimiter(others, pattern, regex_delimiter)
else
{:ok, {leading, closing}}
end
end
defp find_valid_delimiter([delimiter | others], pattern, regex_delimiter) do
if String.contains?(pattern, delimiter) do
find_valid_delimiter(others, pattern, regex_delimiter)
else
{:ok, {delimiter, delimiter}}
end
end
@spec module_name?(String.t()) :: boolean()
def module_name?(string) do
Regex.match?(~r/^(Pleroma|Phoenix|Tesla|Quack|Ueberauth|Swoosh)\./, string) or
string in ["Oban", "Ueberauth", "ExSyslogger", "ConcurrentLimiter"]
end
@spec to_json_types(term()) :: map() | list() | boolean() | String.t() | integer()
def to_json_types(entity) when is_list(entity) do
Enum.map(entity, &to_json_types/1)
end
def to_json_types(%Regex{} = entity), do: inspect(entity)
def to_json_types(entity) when is_map(entity) do
Map.new(entity, fn {k, v} -> {to_json_types(k), to_json_types(v)} end)
end
def to_json_types({:args, args}) when is_list(args) do
arguments =
Enum.map(args, fn
arg when is_tuple(arg) -> inspect(arg)
arg -> to_json_types(arg)
end)
%{"tuple" => [":args", arguments]}
end
def to_json_types({:proxy_url, {type, :localhost, port}}) do
%{"tuple" => [":proxy_url", %{"tuple" => [to_json_types(type), "localhost", port]}]}
end
def to_json_types({:proxy_url, {type, host, port}}) when is_tuple(host) do
ip =
host
|> :inet_parse.ntoa()
|> to_string()
%{
"tuple" => [
":proxy_url",
%{"tuple" => [to_json_types(type), ip, port]}
]
}
end
def to_json_types({:proxy_url, {type, host, port}}) do
%{
"tuple" => [
":proxy_url",
%{"tuple" => [to_json_types(type), to_string(host), port]}
]
}
end
def to_json_types({:partial_chain, entity}),
do: %{"tuple" => [":partial_chain", inspect(entity)]}
def to_json_types(entity) when is_tuple(entity) do
value =
entity
|> Tuple.to_list()
|> to_json_types()
%{"tuple" => value}
end
def to_json_types(entity) when is_binary(entity), do: entity
def to_json_types(entity) when is_boolean(entity) or is_number(entity) or is_nil(entity) do
entity
end
def to_json_types(entity) when entity in [:"tlsv1.1", :"tlsv1.2", :"tlsv1.3"] do
":#{entity}"
end
def to_json_types(entity) when is_atom(entity), do: inspect(entity)
end
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