#!/bin/sh
#
# Copyright (C) 2001-2023 Graeme Walker <graeme_walker@users.sourceforge.net>
# 
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.  This file is offered as-is,
# without any warranty.
# ===
#
# emailrelay-submit.sh
#
# An example script that reads an e-mail message from stdin and deposits in into
# a sub-directory of the E-MailRelay spool directory depending on the "To:"
# address. This could be used with an E-MailRelay POP server using the
# "--pop-by-name" option so that messages get routed appropriately.
#
# See also 'man emailrelay-filter-copy'.
#

store="__SPOOL_DIR__"
log="/var/log/emailrelay-submit.out"

tmp="/tmp/`basename $0.$$.tmp`"
trap "rm -f \"${tmp}\" 2>/dev/null ; exit 0" 0
trap "rm -f \"${tmp}\" 2>/dev/null ; exit 1" 1 2 3 13 15

List()
{
	# Maps from the given "To:" address to a spool sub-directory -- edit as required
	to_="${1}"
	to_="`echo \"${to_}\" | tr '[A-Z]' '[a-z]'`"
	case "${to_}" in
		me@*) echo me_1 me_2 ;;
		other@*) echo other_1 other_2 ;;
		*) echo postmaster ;;
	esac
}

Create()
{
	# Creates a spool sub-directory if it doesnt already exist
	dir_="${1}"
	if test ! -f "${dir_}"
	then
		echo `basename $0`: creating directory \"${dir_}\"
		mkdir "${dir_}"
		chown root:daemon "${dir_}"
		chmod 775 "${dir_}"
	fi
}

Main()
{
	# take a copy of the content
	cat > ${tmp}

	# parse out the "To:" address
	to="`head -500 \"${tmp}\" | grep '^To:' | perl -ane 'print $F[1];exit'`"
	echo `basename $0`: to \"${to}\"

	# submit the message into the main spool directory
	content="`cat \"${tmp}\" | \"${sbin}emailrelay-submit\" --verbose --spool-dir \"${store}\" \"${to}\"`"
	envelope="`echo \"${content}\" | sed 's/content/envelope/'`"
	if test \! -f "${content}"
	then
		echo `basename $0`: emailrelay-submit failed >&2
		trap "" 0 # leave it in /tmp
		return
	fi

	# link & copy into sub-directories
	copied="0"
	for name in `List "${to}"` ""
	do
		if test "${name}" != ""
		then
			Create "${store}/${name}"

			c="${store}/${name}/`basename \"${content}\"`"
			e="${store}/${name}/`basename \"${envelope}\"`"

			ln "${content}" "${c}" && cp -p "${envelope}" "${e}"
			if test "$?" -ne 0 ; then return ; fi
			copied="1"
		fi
	done

	# delete from the main directory
	if test "${copied}" -eq 1
	then
		rm -f "${envelope}" && rm -f "${content}"
	fi
}

Main "$@" >> "${log}" 2>&1