71 lines
1.7 KiB
Elixir
71 lines
1.7 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.OGP do
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@moduledoc """
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Module to parse OpenGraph data in HTML pages
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"""
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require Logger
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alias Mobilizon.Service.RichMedia.Parsers.MetaTagsParser
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@opengraph_properties [
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:title,
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:type,
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:image,
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:url,
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:audio,
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:description,
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:determiner,
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:locale,
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:"locale:alternate",
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:site_name,
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:video,
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:"image:url",
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:"image.secure_url",
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:"image:type",
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:"image:width",
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:"image:height",
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:"image:alt"
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]
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def parse(html, data) do
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Logger.debug("Using OpenGraph card parser")
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with {:ok, data} <-
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MetaTagsParser.parse(
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html,
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data,
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"og",
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"No OGP metadata found",
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:property,
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:content,
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@opengraph_properties
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) do
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data = transform_tags(data)
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Logger.debug("Data found with OpenGraph card parser")
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{:ok, data}
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end
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end
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defp transform_tags(data) do
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data
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|> Enum.reject(fn {_, v} -> is_nil(v) end)
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|> Map.new()
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|> Map.update(:image_remote_url, Map.get(data, :image), & &1)
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|> Map.update(:width, get_integer_value(data, :"image:width"), & &1)
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|> Map.update(:height, get_integer_value(data, :"image:height"), & &1)
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end
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@spec get_integer_value(map(), atom()) :: integer() | nil
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defp get_integer_value(data, key) do
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with value when not is_nil(value) <- Map.get(data, key),
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{value, ""} <- Integer.parse(value) do
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value
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else
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_ -> nil
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end
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end
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end
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