71 lines
1.8 KiB
Elixir
71 lines
1.8 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.TwitterCard do
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@moduledoc """
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Module to parse Twitter tags data in HTML pages
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"""
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alias Mobilizon.Service.RichMedia.Parsers.MetaTagsParser
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require Logger
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@twitter_card_properties [
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:card,
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:site,
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:creator,
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:title,
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:description,
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:image,
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:"image:alt"
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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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Logger.debug("Using Twitter card parser")
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with {:ok, data} <- parse_name_attrs(data, html),
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{:ok, data} <- parse_property_attrs(data, html) do
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data = transform_tags(data)
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Logger.debug("Data found with Twitter card parser")
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Logger.debug(inspect(data))
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data
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end
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end
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@spec parse_name_attrs(map(), String.t()) :: {:ok, map()} | {:error, String.t()}
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defp parse_name_attrs(data, html) do
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MetaTagsParser.parse(
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html,
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data,
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"twitter",
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"No twitter card metadata found",
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:name,
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:content,
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[:"twitter:card"]
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)
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end
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@spec parse_property_attrs(map(), String.t()) :: {:ok, map()} | {:error, String.t()}
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defp parse_property_attrs(data, html) do
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MetaTagsParser.parse(
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html,
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data,
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"twitter",
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"No twitter card metadata found",
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:property,
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:content,
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@twitter_card_properties
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)
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end
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@spec transform_tags(map()) :: map()
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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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|> Enum.map(fn {k, v} -> {k, String.trim(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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end
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end
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