meta_tags_parser.ex
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meta_tags_parser.ex
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	# 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