# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.RichMedia.Parser do @parsers [ Pleroma.Web.RichMedia.Parsers.OGP, Pleroma.Web.RichMedia.Parsers.TwitterCard, Pleroma.Web.RichMedia.Parsers.OEmbed ] @hackney_options [ pool: :media, timeout: 2_000, recv_timeout: 2_000, max_body: 2_000_000 ] def parse(nil), do: {:error, "No URL provided"} if Mix.env() == :test do def parse(url), do: parse_url(url) else def parse(url) do try do Cachex.fetch!(:rich_media_cache, url, fn _ -> {:commit, parse_url(url)} end) rescue e -> {:error, "Cachex error: #{inspect(e)}"} end end end defp parse_url(url) do try do {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: @hackney_options) html |> maybe_parse() |> clean_parsed_data() |> check_parsed_data() rescue e -> {:error, "Parsing error: #{inspect(e)}"} end end defp maybe_parse(html) do Enum.reduce_while(@parsers, %{}, fn parser, acc -> case parser.parse(html, acc) do {:ok, data} -> {:halt, data} {:error, _msg} -> {:cont, acc} end end) end defp check_parsed_data(%{title: title} = data) when is_binary(title) and byte_size(title) > 0 do {:ok, data} end defp check_parsed_data(data) do {:error, "Found metadata was invalid or incomplete: #{inspect(data)}"} end defp clean_parsed_data(data) do data |> Enum.reject(fn {key, val} -> with {:ok, _} <- Jason.encode(%{key => val}) do false else _ -> true end end) |> Map.new() end end