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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.Metadata do
	alias Phoenix.HTML

	def build_tags(params) do
	providers = [
	Pleroma.Web.Metadata.Providers.RelMe,
	Pleroma.Web.Metadata.Providers.RestrictIndexing
	\| activated_providers()
	]

	Enum.reduce(providers, "", fn parser, acc ->
	rendered_html =
	params
	\|> parser.build_tags()
	\|> Enum.map(&to_tag/1)
	\|> Enum.map(&HTML.safe_to_string/1)
	\|> Enum.join()

	acc <> rendered_html
	end)
	end

	def to_tag(data) do
	with {name, attrs, _content = []} <- data do
	HTML.Tag.tag(name, attrs)
	else
	{name, attrs, content} ->
	HTML.Tag.content_tag(name, content, attrs)

	_ ->
	raise ArgumentError, message: "make_tag invalid args"
	end
	end

	def activity_nsfw?(%{data: %{"sensitive" => sensitive}}) do
	Pleroma.Config.get([__MODULE__, :unfurl_nsfw], false) == false and sensitive
	end

	def activity_nsfw?(_) do
	false
	end

	defp activated_providers do
	unless Pleroma.Config.restrict_unauthenticated_access?(:activities, :local) do
	[Pleroma.Web.Metadata.Providers.Feed \| Pleroma.Config.get([__MODULE__, :providers], [])]
	else
	[]
	end
	end
	end