debianize-mobilizon/lib/service/rich_media/parsers/twitter_card.ex

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# Portions of this file are derived from Pleroma:
# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Mobilizon.Service.RichMedia.Parsers.TwitterCard do
@moduledoc """
Module to parse Twitter tags data in HTML pages
"""
alias Mobilizon.Service.RichMedia.Parsers.MetaTagsParser
require Logger
@twitter_card_properties [
:card,
:site,
:creator,
:title,
:description,
:image,
:"image:alt"
]
@spec parse(String.t(), map()) :: {:ok, map()} | {:error, String.t()}
def parse(html, data) do
Logger.debug("Using Twitter card parser")
with {:ok, data} <- parse_name_attrs(data, html),
{:ok, data} <- parse_property_attrs(data, html) do
data = transform_tags(data)
Logger.debug("Data found with Twitter card parser")
Logger.debug(inspect(data))
data
end
end
@spec parse_name_attrs(map(), String.t()) :: {:ok, map()} | {:error, String.t()}
defp parse_name_attrs(data, html) do
MetaTagsParser.parse(
html,
data,
"twitter",
"No twitter card metadata found",
:name,
:content,
[:"twitter:card"]
)
end
@spec parse_property_attrs(map(), String.t()) :: {:ok, map()} | {:error, String.t()}
defp parse_property_attrs(data, html) do
MetaTagsParser.parse(
html,
data,
"twitter",
"No twitter card metadata found",
:property,
:content,
@twitter_card_properties
)
end
@spec transform_tags(map()) :: map()
defp transform_tags(data) do
data
|> Enum.reject(fn {_, v} -> is_nil(v) end)
|> Enum.map(fn {k, v} -> {k, String.trim(v)} end)
|> Map.new()
|> Map.update(:image_remote_url, Map.get(data, :image), & &1)
end
end