50 lines
1.3 KiB
Elixir
50 lines
1.3 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# 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 Mobilizon.Service.RichMedia.Parsers.Fallback do
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@moduledoc """
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Module to parse fallback data in HTML pages (plain old title and meta description)
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"""
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@spec parse(String.t(), map()) :: {:ok, map()} | {:error, String.t()}
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def parse(html, data) do
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data =
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data
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|> maybe_put(html, :title)
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|> maybe_put(html, :description)
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if Enum.empty?(data) do
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{:error, "Not even a title"}
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else
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{:ok, data}
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end
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end
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defp maybe_put(meta, html, attr) do
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case get_page(html, attr) do
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"" -> meta
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content -> Map.put_new(meta, attr, content)
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end
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end
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defp get_page(html, :title) do
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html
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|> Floki.parse_document!()
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|> Floki.find("html title")
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|> List.first()
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|> Floki.text()
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|> String.trim()
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end
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defp get_page(html, :description) do
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case html
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|> Floki.parse_document!()
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|> Floki.find("html meta[name='description']")
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|> List.first() do
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nil -> ""
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elem -> elem |> Floki.attribute("content") |> List.first() |> String.trim()
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end
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end
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end
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