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