git.squeep.com Git - akkoma/blob - lib/pleroma/web/rich_media/parsers/meta_tags_parser.ex

   1 defmodule Pleroma.Web.RichMedia.Parsers.MetaTagsParser do
   2   def parse(html, data, prefix, error_message, key_name, value_name \\ "content") do
   3     with elements = [_ | _] <- get_elements(html, key_name, prefix),
   4          meta_data =
   5            Enum.reduce(elements, data, fn el, acc ->
   6              attributes = normalize_attributes(el, prefix, key_name, value_name)
   7
   8              Map.merge(acc, attributes)
   9            end) do
  10       {:ok, meta_data}
  11     else
  12       _e -> {:error, error_message}
  13     end
  14   end
  15
  16   defp get_elements(html, key_name, prefix) do
  17     html |> Floki.find("meta[#{key_name}^='#{prefix}:']")
  18   end
  19
  20   defp normalize_attributes(html_node, prefix, key_name, value_name) do
  21     {_tag, attributes, _children} = html_node
  22
  23     data =
  24       Enum.into(attributes, %{}, fn {name, value} ->
  25         {name, String.trim_leading(value, "#{prefix}:")}
  26       end)
  27
  28     %{String.to_atom(data[key_name]) => data[value_name]}
  29   end
  30 end