107 lines
2.7 KiB
Elixir
107 lines
2.7 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 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 {_, true} <- {:config, @config_impl.get([:rich_media, :enabled])},
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{_, :ok} <- {:url, 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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else
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{:config, _} -> {:error, :rich_media_disabled}
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{:url, {:error, reason}} -> {:error, {:url, reason}}
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e -> e
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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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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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@spec validate_page_url(URI.t() | binary()) :: :ok | {:error, term()}
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defp validate_page_url(page_url) when is_binary(page_url) do
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validate_tld = @config_impl.get([Pleroma.Formatter, :validate_tld])
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page_url
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|> Linkify.Parser.url?(validate_tld: validate_tld)
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|> parse_uri(page_url)
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end
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defp validate_page_url(%URI{host: host, scheme: "https"}) do
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cond do
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Linkify.Parser.ip?(host) ->
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{:error, :ip}
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host in @config_impl.get([:rich_media, :ignore_hosts], []) ->
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{:error, :ignore_hosts}
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get_tld(host) in @config_impl.get([:rich_media, :ignore_tld], []) ->
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{:error, :ignore_tld}
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true ->
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:ok
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end
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end
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defp validate_page_url(_), do: {:error, "scheme mismatch"}
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defp parse_uri(true, url) do
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url
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|> URI.parse()
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|> validate_page_url
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end
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defp parse_uri(_, _), do: {:error, "not a URL"}
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defp get_tld(host) do
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host
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|> String.split(".")
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|> Enum.reverse()
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|> hd
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end
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end
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