meta_tags_parser.ex (1318B)
- # 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.Parsers.MetaTagsParser do
- def parse(data, html, prefix, key_name, value_name \\ "content") do
- html
- |> get_elements(key_name, prefix)
- |> Enum.reduce(data, fn el, acc ->
- attributes = normalize_attributes(el, prefix, key_name, value_name)
- Map.merge(acc, attributes)
- end)
- |> maybe_put_title(html)
- end
- defp get_elements(html, key_name, prefix) do
- html |> Floki.find("meta[#{key_name}^='#{prefix}:']")
- end
- defp normalize_attributes(html_node, prefix, key_name, value_name) do
- {_tag, attributes, _children} = html_node
- data =
- Map.new(attributes, fn {name, value} ->
- {name, String.trim_leading(value, "#{prefix}:")}
- end)
- %{data[key_name] => data[value_name]}
- end
- defp maybe_put_title(%{"title" => _} = meta, _), do: meta
- defp maybe_put_title(meta, html) when meta != %{} do
- case get_page_title(html) do
- "" -> meta
- title -> Map.put_new(meta, "title", title)
- end
- end
- defp maybe_put_title(meta, _), do: meta
- defp get_page_title(html) do
- Floki.find(html, "html head title") |> List.first() |> Floki.text()
- end
- end