#!/bin/sh

set -e

umask 066

# Resolve some defaults from other system config
basedn="`grep '^BASE\b' /etc/ldap/ldap.conf | sed -e 's/^BASE[[:space:]]\+//' -e 's/,[[:space:]]\+/,/g'`"
dnsdomain="`dnsdomainname`"
orgname=""
if [ -r /etc/local-ORG/orgname ]; then
	orgname="$(head -n 1 /etc/local-ORG/orgname)"
fi

# config defaults as of slapd 2.4.10-3
backend="hdb"

# Ensure all required values are properly resolved
for var in basedn dnsdomain orgname backend; do
	if [ -z "`eval echo '$'$var`" ]; then
		echo 1>&2 "ERROR: Required variable '$var' missing. Exiting...!"
		exit 1
	fi
done

# concatenate files with an additional newline in between
spacecat() {
	perl -e 'foreach (@ARGV) {print "\n" if $n; $n++; open (FH, $_); print while(<FH>); close FH;}' "$@"
}

#TODO: Somehow lookup id directly instead, as getent might be slow with
#      thousands of entries, and some NSS mechanisms drop at some limit
#      i.e. openldap by default return only first 500 entries
nextfreeid() {
	type="$1"
	id="$2"
	max="$3"
	case $type in
		uid) column="3";;
		gid) column="4";;
	esac
	while getent passwd | awk -F: "{ print \$$column }" | grep -Fqx "$id"; do
		id=$(($id + 1))
		[ -z "$max" ] || [ "$id" -lt "$max" ] || return 1
	done
	echo "$id"
}

masterdir=/etc/local-COMMON/ldap/db
tempdir=`mktemp -dt slapd.XXXXXX`

snippets="$(LANG=C find "$masterdir" -type f -name '*.conf.in' | sort)"
spacecat $snippets | sed >>"$tempdir/slapd.conf" \
		-e "s/@BACKEND@/$backend/g" \
		-e "s/@SUFFIX@/$basedn/g" \
		-e "s/@ADMIN@/cn=admin,$basedn/g"

# TODO: Better separate core from normal lif files than "below 100"...
file=99
for section in core base cipux horde; do
	sed <"$masterdir/$section.ldif.in" >"$tempdir/${file}_$section.ldif" \
		-e "s/@SUFFIX@/$basedn/g" \
		-e "s/@DOMAIN@/$dnsdomain/g" \
		-e "s/@ORG@/$orgname/g"
	file=$(($file + 1))
done

# FIXME: create cipuxadm in addition to below roles!

# FIXME: fix apply passwords for roles in a sane way!
uid=10100
gid=10100
file=200
for role in admin professor assistant pupil student tutor teacher lecturer; do
	uid="$(nextfreeid uid "$uid")"
	gid="$(nextfreeid gid "$gid")"
	snippets="$masterdir/cipux_rolegroup.ldif.in $masterdir/cipux_roleuser.ldif.in"
	spacecat $snippets | sed >"$tempdir/${file}_$role.ldif" \
		-e "s/@SUFFIX@/$basedn/g" \
		-e "s/@ROLE@/$role/g" \
		-e "s/@UID@/$uid/g" \
		-e "s/@GID@/$gid/g" \
		-e "s/@DOMAIN@/$dnsdomain/g" \
		-e "s/@ORG@/$orgname/g"
	uid=$(($uid + 1))
	gid=$(($gid + 1))
	file=$(($file + 1))
done

file=300
for db in passwd group; do
	getent $db >"$tempdir/$db.dump"
	( cd /usr/share/migrationtools && ./migrate_$db.pl "$tempdir/$db.dump" >"$tempdir/${file}_$db.ldif" )
	file=$(($file + 1))
done

#invoke-rc.d slapd stop
#slapadd -l "$tempdir/99_core.ldif"
#invoke-rc.d slapd start
#ldappasswd -x -h localhost -D "cn=admin,$basedn" -S -w supersecretpassword "cn=admin,$basedn"
for file in $(run-parts --list --regex '^1[0-9]{2}_[a-z0-9-]+\.ldif' "$tempdir"); do
	ldapadd -x -h localhost -D "cn=admin,$basedn" -f "$file" -W
done
for role in cipux horde; do
	echo "Securing $role..."
	ldappasswd -x -h localhost -D "cn=admin,$basedn" -S -W "cn=$role,ou=Entities,ou=Access Control,$basedn"
done

# FIXME: Write addmember(), that create group as needed
#ldapmodify -x -h localhost -D "cn=admin,$basedn" -W <<EOF
#dn: cn=DSA,ou=Administrators,ou=Groups,ou=Access Control,$basedn
#changetype: modify
#add: uniqueMember
#uniqueMember: cn=cipux,ou=Entities,ou=Access Control,$basedn
#EOF
ldapadd -x -h localhost -D "cn=admin,$basedn" -W <<EOF
dn: cn=DSA,ou=Administrators,ou=Groups,ou=Access Control,$basedn
objectClass: groupOfUniqueNames
cn: DSA
description: Directory System Agent administrators
uniqueMember: cn=cipux,ou=Entities,ou=Access Control,$basedn
EOF
ldapadd -x -h localhost -D "cn=admin,$basedn" -W <<EOF
dn: cn=SAM,ou=Administrators,ou=Groups,ou=Access Control,$basedn
objectClass: groupOfUniqueNames
cn: SAM
description: Samba and NSS services administrators
uniqueMember: cn=horde,ou=Entities,ou=Access Control,$basedn
EOF

# TODO: Add "uid=cifsdc,ou=Entities,ou=Access Control,@SUFFIX@" to group
#       "cn=SAM,ou=Administrators,ou=Access Control,@SUFFIX@" for samba

for file in $(run-parts --list --regex '^2[0-9]{2}_[a-z0-9-]+\.ldif' "$tempdir"); do
	ldapadd -x -h localhost -D "cn=admin,$basedn" -f "$file" -W
done

# FIXME: Check (and maybe correct) basedn from migrationtools-generated ldifs
#for file in $(run-parts --list --regex '^3[0-9]{2}_[a-z0-9-]+\.ldif' "$tempdir"); do
#	ldapadd -x -h localhost -D "cn=admin,$basedn" -f "$file" -W
#done