76 lines
1.8 KiB
Elixir
76 lines
1.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 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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require Logger
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@config_impl Application.compile_env(:pleroma, [__MODULE__, :config_impl], Pleroma.Config)
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defp parsers do
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Pleroma.Config.get([:rich_media, :parsers])
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end
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def parse(nil), do: nil
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@spec parse(String.t()) :: {:ok, map()} | {:error, any()}
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def parse(url) do
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with :ok <- validate_page_url(url),
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{:ok, data} <- parse_url(url) do
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data = Map.put(data, "url", url)
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{:ok, data}
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end
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end
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defp parse_url(url) do
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with {:ok, %Tesla.Env{body: html}} <- Pleroma.Web.RichMedia.Helpers.rich_media_get(url),
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{:ok, html} <- Floki.parse_document(html) do
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html
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|> maybe_parse()
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|> clean_parsed_data()
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|> check_parsed_data()
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end
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end
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def parse_with_timeout(url) do
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try do
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task =
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Task.Supervisor.async_nolink(Pleroma.TaskSupervisor, fn ->
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parse_url(url)
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end)
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Task.await(task, 5000)
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catch
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:exit, {:timeout, _} ->
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Logger.warning("Timeout while fetching rich media for #{url}")
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{:error, :timeout}
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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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data when data != %{} -> {:halt, data}
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_ -> {: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)
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when is_binary(title) and title != "" 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, {:invalid_metadata, data}}
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end
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defp clean_parsed_data(data) do
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data
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|> Enum.reject(fn {key, val} ->
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not match?({:ok, _}, Jason.encode(%{key => val}))
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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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