#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  security-txt
		  security-txt -h
	EOF
}

help() {
	cat <<-'EOF'


		Options:
		  -h, --help    show this message


		Generate the RFC 9116 "security.txt" file from data in the
		repository.


		Examples:

		  Just run it:

		    $ security-txt > .well-known/security.txt
	EOF
}


for flag in "$@"; do
	case "$flag" in
		--)
			break
			;;
		--help)
			usage
			help
			exit
			;;
		*)
			;;
	esac
done

while getopts 'h' flag; do
	case "$flag" in
		h)
			usage
			help
			exit
			;;
		*)
			usage >&2
			exit 2
	esac
done
shift $((OPTIND - 1))



EXPIRES="$(
	LANG=C.UTF-8 gpg --list-key "$EMAIL" |
		awk '/^pub/ { print substr($(NF), 1, 10) }'
)T00:00:00z"

LANGUAGES="$(
	langs |
		sed 's|^|, |' |
		tr -d '\n' |
		sed 's|^, ||'
)"


cat <<-EOF
	Contact: mailto:$EMAIL
	Encryption: $(url-for 'public.asc.txt' | absolute)
	Expires: $EXPIRES
	Preferred-Languages: $LANGUAGES
EOF