parser.ex (2442B)
- # Pleroma: A lightweight social networking server
- # Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
- # SPDX-License-Identifier: AGPL-3.0-only
- defmodule Pleroma.Web.RichMedia.Parser do
- require Logger
- @config_impl Application.compile_env(:pleroma, [__MODULE__, :config_impl], Pleroma.Config)
- defp parsers do
- Pleroma.Config.get([:rich_media, :parsers])
- end
- def parse(nil), do: nil
- @spec parse(String.t()) :: {:ok, map()} | {:error, any()}
- def parse(url) do
- with :ok <- validate_page_url(url),
- {:ok, data} <- parse_url(url) do
- data = Map.put(data, "url", url)
- {:ok, data}
- end
- end
- defp parse_url(url) do
- with {:ok, %Tesla.Env{body: html}} <- Pleroma.Web.RichMedia.Helpers.rich_media_get(url),
- {:ok, html} <- Floki.parse_document(html) do
- html
- |> maybe_parse()
- |> clean_parsed_data()
- |> check_parsed_data()
- end
- end
- defp maybe_parse(html) do
- Enum.reduce_while(parsers(), %{}, fn parser, acc ->
- case parser.parse(html, acc) do
- data when data != %{} -> {:halt, data}
- _ -> {:cont, acc}
- end
- end)
- end
- defp check_parsed_data(%{"title" => title} = data)
- when is_binary(title) and title != "" do
- {:ok, data}
- end
- defp check_parsed_data(data) do
- {:error, {:invalid_metadata, data}}
- end
- defp clean_parsed_data(data) do
- data
- |> Enum.reject(fn {key, val} ->
- not match?({:ok, _}, Jason.encode(%{key => val}))
- end)
- |> Map.new()
- end
- @spec validate_page_url(URI.t() | binary()) :: :ok | :error
- defp validate_page_url(page_url) when is_binary(page_url) do
- validate_tld = @config_impl.get([Pleroma.Formatter, :validate_tld])
- page_url
- |> Linkify.Parser.url?(scheme: true, validate_tld: validate_tld)
- |> parse_uri(page_url)
- end
- defp validate_page_url(%URI{host: host, scheme: "https"}) do
- cond do
- Linkify.Parser.ip?(host) ->
- :error
- host in @config_impl.get([:rich_media, :ignore_hosts], []) ->
- :error
- get_tld(host) in @config_impl.get([:rich_media, :ignore_tld], []) ->
- :error
- true ->
- :ok
- end
- end
- defp validate_page_url(_), do: :error
- defp parse_uri(true, url) do
- url
- |> URI.parse()
- |> validate_page_url
- end
- defp parse_uri(_, _), do: :error
- defp get_tld(host) do
- host
- |> String.split(".")
- |> Enum.reverse()
- |> hd
- end
- end