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	# Pleroma: A lightweight social networking server
	# Copyright _ 2017-2019 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.RichMedia.Helpers do
	alias Pleroma.Activity
	alias Pleroma.HTML
	alias Pleroma.Object
	alias Pleroma.Web.RichMedia.Parser

	defp validate_page_url(page_url) when is_binary(page_url) do
	if AutoLinker.Parser.is_url?(page_url, true) do
	URI.parse(page_url) \|> validate_page_url
	else
	:error
	end
	end

	defp validate_page_url(%URI{authority: nil}), do: :error
	defp validate_page_url(%URI{scheme: nil}), do: :error
	defp validate_page_url(%URI{}), do: :ok
	defp validate_page_url(_), do: :error

	def fetch_data_for_activity(%Activity{data: %{"type" => "Create"}} = activity) do
	with true <- Pleroma.Config.get([:rich_media, :enabled]),
	%Object{} = object <- Object.normalize(activity),
	{:ok, page_url} <- HTML.extract_first_external_url(object, object.data["content"]),
	:ok <- validate_page_url(page_url),
	{:ok, rich_media} <- Parser.parse(page_url) do
	%{page_url: page_url, rich_media: rich_media}
	else
	_ -> %{}
	end
	end

	def fetch_data_for_activity(_), do: %{}

	def perform(:fetch, %Activity{} = activity), do: fetch_data_for_activity(activity)
	end