uri_helper.ex
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uri_helper.ex
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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.Helpers.UriHelper do
	def append_uri_params(uri, appended_params) do
	uri = URI.parse(uri)
	appended_params = for {k, v} <- appended_params, into: %{}, do: {to_string(k), v}
	existing_params = URI.query_decoder(uri.query \|\| "") \|> Enum.into(%{})
	updated_params_keys = Enum.uniq(Map.keys(existing_params) ++ Map.keys(appended_params))

	updated_params =
	for k <- updated_params_keys, do: {k, appended_params[k] \|\| existing_params[k]}

	uri
	\|> Map.put(:query, URI.encode_query(updated_params))
	\|> URI.to_string()
	end

	def append_param_if_present(%{} = params, param_name, param_value) do
	if param_value do
	Map.put(params, param_name, param_value)
	else
	params
	end
	end
	end