39 lines
1.2 KiB
Elixir
39 lines
1.2 KiB
Elixir
defmodule Pleroma.Web.RichMedia.Parsers.MetaTagsParser do
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def parse(html, data, prefix, error_message, key_name, value_name \\ "content") do
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with elements = [_ | _] <- get_elements(html, key_name, prefix),
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meta_data =
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Enum.reduce(elements, 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) do
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rich_meta_data = maybe_use_page_title(meta_data, html)
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{:ok, rich_meta_data}
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else
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_e -> {:error, error_message}
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end
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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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Enum.into(attributes, %{}, fn {name, value} ->
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{name, String.trim_leading(value, "#{prefix}:")}
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end)
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%{String.to_atom(data[key_name]) => data[value_name]}
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end
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defp maybe_use_page_title(meta_data, html) do
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if !Map.has_key?(meta_data, :title) do
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page_title = Floki.find(html, "title") |> Floki.text()
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Map.put_new(meta_data, :title, page_title)
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end
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end
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end
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