#!/bin/sh

if [ "${NGX_HTTP}" = 0 ] ; then
	unset NGX_HTTP_TRANSPARENT_PROXY NGX_HTTP_FAKE_UA NGX_HTTP_X_FORWARDED
else
	unset _NGX_HTTP_FAKE_UA _NGX_HTTP_X_FORWARDED
	## here should be SANE defaults (!)
	_NGX_HTTP_FAKE_UA='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36'
	_NGX_HTTP_X_FORWARDED=pass

	NGX_HTTP_TRANSPARENT_PROXY=$(gobool_to_int "${NGX_HTTP_TRANSPARENT_PROXY:-0}" 0)
	export NGX_HTTP_TRANSPARENT_PROXY
	if [ "${NGX_HTTP_TRANSPARENT_PROXY}" = 1 ] ; then
		[ -n "${NGX_HTTP_FAKE_UA:-}" ] || NGX_HTTP_FAKE_UA=${_NGX_HTTP_FAKE_UA}
		export NGX_HTTP_FAKE_UA

		if [ -n "${NGX_HTTP_X_FORWARDED:-}" ] ; then
			case "${NGX_HTTP_X_FORWARDED}" in
			[Rr][Ee][Mm][Oo][Vv][Ee] ) ;;
			* )
				log_always "NGX_HTTP_X_FORWARDED: overridden to 'remove' due to NGX_HTTP_TRANSPARENT_PROXY=1"
			;;
			esac
		fi
		NGX_HTTP_X_FORWARDED=remove
	fi

	if [ -z "${NGX_HTTP_X_FORWARDED:-}" ] ; then
		NGX_HTTP_X_FORWARDED=${_NGX_HTTP_X_FORWARDED}
	else
		case "${NGX_HTTP_X_FORWARDED}" in
		[Pp][Aa][Ss][Ss] )
			## adjust
			NGX_HTTP_X_FORWARDED=pass
		;;
		[Rr][Ee][Mm][Oo][Vv][Ee] )
			## adjust
			NGX_HTTP_X_FORWARDED=remove
		;;
		* )
			unset x
			x=$(gobool_to_int "${NGX_HTTP_X_FORWARDED}")
			case "$x" in
			0 ) NGX_HTTP_X_FORWARDED=remove ;;
			1 ) NGX_HTTP_X_FORWARDED=pass ;;
			* )
				log_always "NGX_HTTP_X_FORWARDED: unrecognized value: ${NGX_HTTP_X_FORWARDED}"
				log_always "setting NGX_HTTP_X_FORWARDED=${_NGX_HTTP_X_FORWARDED}"
				NGX_HTTP_X_FORWARDED=${_NGX_HTTP_X_FORWARDED}
			;;
			esac
			unset x
		;;
		esac
	fi
	export NGX_HTTP_X_FORWARDED

	unset _NGX_HTTP_FAKE_UA _NGX_HTTP_X_FORWARDED
fi