#

# Copyright (c) 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 LucĂ­a Andrea Illanes Albornoz <lucia@luciaillanes.de>

# set +o errexit -o noglob -o nounset is assumed.

#

#

# rtl_fetch_url_wget() - fetch archive file(s) for item

# @_urls:		list of URLs

# @_sha256sum_src:	SHA256SUM digest file to check authenticity of archive file(s) with

# @_target_dname:	target directory namne

# @_target_fname:	target filename

# @_target_name:	target subdirectory name

# @_mirrors:		optional list of mirror base URLs

#

# Returns:		zero (0) on success, non-zero (>0) on failure

# N.B.			URLs ($1) may contain `?' or '&' characters.

#

rtl_fetch_url_wget() {

	local	_rfuw_urls="${1}" _rfuw_sha256sum_src="${2}" _rfuw_target_dname="${3}"		\

		_rfuw_target_fname="${4}" _rfuw_target_name="${5}" _rfuw_mirrors="${6:-}"	\

		_rfuw_rc=0 _rfuw_sha256sum_target="" _rfuw_target_fname_full="" _rfuw_url=""	\

		_rfuw_url_base="" _rfuw_urls_count=0 _rfuw_urls_full="";

	_rfuw_urls_full="${_rfuw_urls}";

	for _rfuw_url_base in ${_rfuw_mirrors}; do

		rtl_lconcat \$_rfuw_urls_full "${_rfuw_url_base%/}/${_rfuw_target_name}/${_rfuw_target_fname}";

	done;

	rtl_llength \$_rfuw_urls_count \$_rfuw_urls_full;

	for _rfuw_url in ${_rfuw_urls_full}; do

		if [ "${_rfuw_target_fname:+1}" != 1 ]; then

			rtl_basename2 \$_rfuw_url \$_rfuw_target_fname;

		fi;

		_rfuw_target_fname_full="${_rfuw_target_dname}/${_rfuw_target_fname}";

		(set +o errexit -o noglob -o nounset;

		rtl_flock_acquire 4 || exit 1;

		trap "_rfuw_rc=\"\${?}\"; rm -f \"${_rfuw_target_fname_full}.fetching\"; exit \"\${_rfuw_rc}\";" EXIT;

		if [ "${_rfuw_sha256sum_src:+1}" != 1 ]\

		|| ! rtl_check_digest_file "${_rfuw_target_fname_full}" "${_rfuw_sha256sum_src}" "${_rfuw_target_fname_full}.fetched"; then

			wget ${DEFAULT_WGET_ARGS} -O "${_rfuw_target_fname_full}" "${_rfuw_url}"; _rfuw_rc="${?}";

			if [ "${_rfuw_rc}" -ne 0 ]; then

				exit $((${_rfuw_rc}+2));

			elif [ "${_rfuw_sha256sum_src:+1}" = 1 ]\

			&& ! rtl_check_digest \$_digest "${_rfuw_target_fname_full}" "${_rfuw_sha256sum_src}"; then

				exit 2;

			else

				printf "%s" "${_digest}" > "${_rfuw_target_fname_full}.fetched"; exit 0;

			fi;

		else

			exit 0;

		fi;) 4<>"${_rfuw_target_fname_full}.fetching"; _rfuw_rc="${?}"; : $((_rfuw_urls_count-=1));

		case "${_rfuw_rc}" in

		0)	break; ;;

		1)	if [ "${_rfuw_urls_count}" -ge 1 ]; then

				rtl_log_msg "warning" "${MSG_rtl_fetch_lockfail_retryurl}" "${_rfuw_url}";

			else

				rtl_log_msg "fatal" "${MSG_rtl_fetch_lockfail}" "${_rfuw_url}";

				rtl_fileop rm "${_rfuw_target_fname_full}"; break;

			fi; ;;

		2)	if [ "${_rfuw_urls_count}" -ge 1 ]; then

				rtl_log_msg "warning" "${MSG_rtl_fetch_hashfail_retryurl}" "${_rfuw_url}" "${_rfuw_sha256sum_src}";

			else

				if _rfuw_sha256sum_target="$(sha256sum "${_rfuw_target_fname_full}" |\

							awk '{print $1}' 2>/dev/null)"; then

					rtl_log_msg "fatal" "${MSG_rtl_fetch_hashfail1}" "${_rfuw_url}" "${_rfuw_sha256sum_src}" "${_rfuw_sha256sum_target}";

				else

					rtl_log_msg "fatal" "${MSG_rtl_fetch_hashfail2}" "${_rfuw_url}" "${_rfuw_sha256sum_src}";

				fi;

				rtl_fileop rm "${_rfuw_target_fname_full}"; break;

			fi; ;;

		*)	if [ "${_rfuw_urls_count}" -ge 1 ]; then

				rtl_log_msg "warning" "${MSG_rtl_fetch_fail_retryurl}" "${_rfuw_url}" "$((${_rfuw_rc}-2))";

			else

				rtl_log_msg "fatal" "${MSG_rtl_fetch_fail}" "${_rfuw_url}" "$((${_rfuw_rc}-2))";

				rtl_fileop rm "${_rfuw_target_fname_full}"; break;

			fi; ;;

		esac;

	done;

	return "${_rfuw_rc}";

};

# vim:filetype=sh textwidth=0