47 lines
1.3 KiB
Elixir
47 lines
1.3 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.RichMedia.Parsers.MetaTagsParser do
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def parse(data, html, prefix, key_name, value_name \\ "content") do
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html
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|> get_elements(key_name, prefix)
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|> Enum.reduce(data, fn el, acc ->
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attributes = normalize_attributes(el, prefix, key_name, value_name)
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Map.merge(acc, attributes)
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end)
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|> maybe_put_title(html)
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end
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defp get_elements(html, key_name, prefix) do
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html |> Floki.find("meta[#{key_name}^='#{prefix}:']")
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end
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defp normalize_attributes(html_node, prefix, key_name, value_name) do
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{_tag, attributes, _children} = html_node
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data =
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Map.new(attributes, fn {name, value} ->
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{name, String.trim_leading(value, "#{prefix}:")}
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end)
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%{data[key_name] => data[value_name]}
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end
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defp maybe_put_title(%{"title" => _} = meta, _), do: meta
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defp maybe_put_title(meta, html) when meta != %{} do
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case get_page_title(html) do
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"" -> meta
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title -> Map.put_new(meta, "title", title)
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end
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end
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defp maybe_put_title(meta, _), do: meta
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defp get_page_title(html) do
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Floki.find(html, "html head title") |> List.first() |> Floki.text()
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end
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end
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