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|
defmodule Lithium.DMARC.Parser do
@moduledoc """
A wrapper around the `:dmarc_parser` yecc and leex parser.
This module is responsible for parsing DMARC records and returning a
map of the parsed values. It is then up to the `Lithium.DMARC.Policy`
module to validate and process these values.
"""
require Logger
def parse_policy(record) do
case :dmarc_lexer.string(String.to_charlist(record)) do
{:ok, tokens, _} ->
case :dmarc_parser.parse(tokens) do
{:ok, %{invalid: invalid_tokens, valid: parsed}} ->
if Kernel.map_size(invalid_tokens) > 0 do
Logger.warning("DMARC record contains invalid tokens: #{inspect(invalid_tokens)}")
end
{:ok, keyword_to_string_map(parsed)}
{:error, reason} ->
{:error, reason}
{:error, reason, _} ->
{:error, reason}
end
{:error, reason} ->
{:error, reason}
{:error, reason, _} ->
{:error, reason}
end
end
defp keyword_to_string_map(keyword_list) do
keyword_list
|> Enum.map(fn {k, v} ->
{k, convert_value(v)}
end)
|> Map.new()
end
defp convert_value(value) when is_list(value) and is_integer(hd(value)) do
to_string(value)
end
defp convert_value(value) when is_list(value) do
Enum.map(value, &convert_value/1)
end
defp convert_value(value), do: value
end
|
