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(data, html, prefix, key_name, value_name \\ "content") do
8 |> get_elements(key_name, prefix)
9 |> Enum.reduce(data, fn el, acc ->
10 attributes = normalize_attributes(el, prefix, key_name, value_name)
12 Map.merge(acc, attributes)
14 |> maybe_put_title(html)
17 defp get_elements(html, key_name, prefix) do
18 html |> Floki.find("meta[#{key_name}^='#{prefix}:']")
21 defp normalize_attributes(html_node, prefix, key_name, value_name) do
22 {_tag, attributes, _children} = html_node
25 Map.new(attributes, fn {name, value} ->
26 {name, String.trim_leading(value, "#{prefix}:")}
29 %{data[key_name] => data[value_name]}
32 defp maybe_put_title(%{"title" => _} = meta, _), do: meta
34 defp maybe_put_title(meta, html) when meta != %{} do
35 case get_page_title(html) do
37 title -> Map.put_new(meta, "title", title)
41 defp maybe_put_title(meta, _), do: meta
43 defp get_page_title(html) do
44 Floki.find(html, "html head title") |> List.first() |> Floki.text()