#!/bin/sh
#
# Copyright (c) 2026 Kimmo Suominen
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
PATH=/bin:/usr/bin
export PATH
headers()
{
local EXPDATE EXPIRES EXPSECS
local status type
status="${1:-404}"
type="${2:-text/plain}"
# 24 hours
EXPSECS=86400
case "${status}" in
30[12345678])
status="${status} Found"
;;
404)
# 6 hours
EXPSECS=21600
status="${status} Not Found"
;;
esac
EXPDATE=$(($(date '+%s') + ${EXPSECS}))
EXPIRES=$(date -u -r "${EXPDATE}" '+%a, %d %b %Y %H:%M:%S GMT')
cat <<-EOF
Status: ${status}
Expires: ${EXPIRES}
Cache-Control: public, max-age=${EXPSECS}
EOF
}
not_found()
{
headers 404 text/plain
cat <<-EOF
Not found: ${DOCUMENT_URI}
EOF
#echo; env
exit 0
}
redirect()
{
local where
where="${1}"
headers 302 text/html
cat <<-EOF
Location: ${where}
${DOCUMENT_URI}
Found: ${where}
EOF
exit 0
}
server_error()
{
local where
where="${1}"
cat <<-EOF
Status: 500 Internal Server Error
Content-Type: text/plain
Not found: ${DOCUMENT_URI}
Resolved : ${where}
EOF
#echo; env
exit 0
}
case "${DOCUMENT_URI}" in
/pub/*)
r="$(realpath -qe "${DOCUMENT_URI}")"
case "${r}" in
"${DOCUMENT_URI}")
# This should never happen
server_error "${r}"
;;
/pub/*)
redirect "${r}"
;;
esac
;;
esac
not_found