1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.RichMedia.Parsers.MetaTagsParser do
6 def parse(html, data, prefix, error_message, key_name, value_name \\ "content") do
9 |> get_elements(key_name, prefix)
10 |> Enum.reduce(data, fn el, acc ->
11 attributes = normalize_attributes(el, prefix, key_name, value_name)
13 Map.merge(acc, attributes)
15 |> maybe_put_title(html)
17 if Enum.empty?(meta_data) do
18 {:error, error_message}
24 defp get_elements(html, key_name, prefix) do
25 html |> Floki.find("meta[#{key_name}^='#{prefix}:']")
28 defp normalize_attributes(html_node, prefix, key_name, value_name) do
29 {_tag, attributes, _children} = html_node
32 Enum.into(attributes, %{}, fn {name, value} ->
33 {name, String.trim_leading(value, "#{prefix}:")}
36 %{String.to_atom(data[key_name]) => data[value_name]}
39 defp maybe_put_title(%{title: _} = meta, _), do: meta
41 defp maybe_put_title(meta, html) when meta != %{} do
42 case get_page_title(html) do
44 title -> Map.put_new(meta, :title, title)
48 defp maybe_put_title(meta, _), do: meta
50 defp get_page_title(html) do
51 Floki.find(html, "html head title") |> List.first() |> Floki.text()