#!/usr/bin/env bash
clear
echo -e "\n\t\033[32mStart script for installation of vacation script (from postfixadmin) ..\033[m"

## ===================================================================
## - Install Postfixadmin
## ===================================================================

## -----------------------------------------------------------------
## ----------------------------------------------------------------
## ---
## --- For configurations see file conf/install_postfixadmin.conf
## ---
## --- Dont make changes here!
## ---
## -----------------------------------------------------------------
## -----------------------------------------------------------------

# -------------
# - Settings
# -------------

_src_base_dir="$(realpath $(dirname $0))"
conf_file="${_src_base_dir}/conf/install_postfixadmin.conf"

log_file="$(mktemp)"
backup_date="$(date +%Y-%m-%d-%H%M)"

declare -A check_entry_main_cf_arr

# -------------
# - Functions
# -------------

clean_up() {

   # Perform program exit housekeeping
   rm -f "$log_file"
   exit $1
}

echononl(){
   echo X\\c > /tmp/shprompt$$
   if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
      echo "$*\\c" 1>&2
   else
       echo -e -n "$*" 1>&2
   fi
   rm /tmp/shprompt$$
}

fatal(){
   echo ""
   echo -e "\t[ \033[31m\033[1mFatal\033[m ]: $*"
   echo ""
   echo -e "\t\033[31m\033[1mInstalllation wird abgebrochen\033[m\033[m"
   echo ""
   clean_up 1
}

error(){
   echo ""
   echo -e "\t[ \033[31m\033[1mFehler\033[m ]: $*"
   echo ""
}

warn (){
   echo ""
   echo -e "\t[ \033[33m\033[1mWarning\033[m ]: $*"
   echo ""
}
info (){
   echo ""
   echo -e "\t[ \033[32m\033[1mInfo\033[m ]: $*"
   echo ""
}
# - remove leading/trailling whitespaces
# -
trim() {
    local var="$*"
    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
    echo -n "$var"
}

echo_ok() {
   echo -e "\033[75G[ \033[32mok\033[m ]"
   ## echo -e "  [ ok ]"
}
echo_failed(){
   echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
   ## echo -e "  [ failed ]"
}
echo_skipped() {
   echo -e "\033[75G[ \033[30m\033[1mskipped\033[m ]"
}


if [ "$POSTFIX_DB_TYPE" = "postgres" -o  "$POSTFIX_DB_TYPE" = "postgresql" -o "$POSTFIX_DB_TYPE" = "pgsql" -o "$POSTFIX_DB_TYPE" = "psql" ];then
   POSTFIX_DB_TYPE=pgsql
fi

echo
echononl "\tInclude Configuration file.."
if [[ ! -f $conf_file ]]; then
   echo_failed
   fatal "Missing configuration file '$conf_file'"
else
   source $conf_file
   echo_ok
fi

echo -e "\033[32m--\033[m"
echo ""
echo "Version of the EXISTING Postfixadmin installation"
echo ""
echo ""
PF_ADMIN_VERSION=
while [ "X$PF_ADMIN_VERSION" = "X" ]
do
   echononl "Postfixadmin Version: "
   read PF_ADMIN_VERSION
   if [ "X$PF_ADMIN_VERSION" = "X" ]; then
      echo -e "\n\t\033[33m\033[1mA version number is required!\033[m\n"
   fi
done
echo ""
echo -e "\033[32m--\033[m"
echo ""

_vacation_script="$(find ${_src_base_dir}/postfixadmin-${PF_ADMIN_VERSION} -type f -name vacation.pl -print 2>/dev/null)"

if [[ ! -d "${_src_base_dir}/postfixadmin-${PF_ADMIN_VERSION}" ]]; then
	fatal "Postfix Admin source directory (${_src_base_dir}/postfixadmin-${PF_ADMIN_VERSION}) not found"
fi
if [[ -z "$(trim "$_vacation_script")" ]]; then
	fatal "No vacation script found!"
fi



# - Default values
# -
DEFAULT_WEBSITE_BASEDIR="/var/www/${WEBSITE_NAME}"

DEFAULT_VACATION_USER="vacation"
DEFAULT_VACATION_GROUP="vacation"

DEFAULT_POSTFIX_DB_NAME="postfix"
DEFAULT_POSTFIX_DB_USER="postfix"

DEFAULT_POSTFIX_DB_HOST_MYSQL="unix:/tmp/mysql.sock"


[[ -n "$PF_ADMIN_VERSION" ]] || fatal "Version of Postfix Admin to install (PF_ADMIN_VERSION) not present!"
[[ -n "$WEBSITE_NAME" ]] || fatal "Website's name (WEBSITE_NAME) not present!"

TLD=${WEBSITE_NAME##*.}
_tmp_string=${WEBSITE_NAME%.*}
MAIN_DOMAIN=${_tmp_string##*.}

[[ -n "$AUTOREPLY_HOSTNAME" ]] || AUTOREPLY_HOSTNAME=autoreply.${MAIN_DOMAIN}.$TLD

[[ -n "$POSTFIX_DB_HOST_MYSQL" ]] || POSTFIX_DB_HOST_MYSQL="$DEFAULT_POSTFIX_DB_HOST_MYSQL"

if [[ "$POSTFIX_DB_HOST_MYSQL" =~ sock$ ]] || [[ "$POSTFIX_DB_HOST_MYSQL" =~ localhost ]]; then
	VACATION_DB_HOST_MYSQL="127.0.0.1"
else
	VACATION_DB_HOST_MYSQL="$POSTFIX_DB_HOST_MYSQL"
fi

[[ -n "$POSTFIX_DB_TYPE" ]] || fatal "Database Type of Postfix Database (POSTFIX_DB_TYPE) not present!"
[[ -n "$POSTFIX_DB_NAME" ]] || POSTFIX_DB_NAME="$DEFAULT_POSTFIX_DB_NAME"
[[ -n "$POSTFIX_DB_USER" ]] || POSTFIX_DB_USER="$DEFAULT_POSTFIX_DB_USER"
[[ -n "$POSTFIX_DB_PASS" ]] || fatal "Password of Postfix Database (POSTFIX_DB_PASS) not given!"

# - Vacation
# -

[[ -n "$VACATION_USER" ]] || VACATION_USER=$DEFAULT_VACATION_USER
[[ -n "$VACATION_GROUP" ]] || VACATION_GROUP=$DEFAULT_VACATION_GROUP


echo ""
echo ""
echo -e "\033[1;32mSettings for installation of \033[1;37mPostfix Admin / Vacation\033[m"
echo ""
echo -e   "\tPostfix Admin Version................: $PF_ADMIN_VERSION"
echo ""
echo -e   "\tHostname for Vacation Messages.......: $AUTOREPLY_HOSTNAME"
echo -e   "\tUser of vacation script..............: $VACATION_USER"
echo -e   "\tGroup of vacation script.............: $VACATION_GROUP"
echo ""
echo -e   "\tName of Postfix Database.............: $POSTFIX_DB_NAME"
echo -e   "\tUser of Postfix Database.............: $POSTFIX_DB_USER"
echo -e   "\tPassword of Postfix Database.........: $POSTFIX_DB_PASS"
echo ""
echo ""

echo ""
echo -n "Type upper case 'YES' to continue executing with this parameters: "
read OK
if [[ "$OK" = "YES" ]] ; then
   echo ""
   echo ""
   echo -e "\t\033[1;32mGoing to install Postfix Admin / Vacation \033[1;37m\033[m"
else
   fatal "Abort by user request - Answer as not 'YES'"
fi




echo -e "\n\n\t\033[37m\033[1mInstall Vacation\033[m\n"

echononl "\tInstall database related CPAN Modules"
_failed=false
> $log_file
_needed_cpan_modules="
   CPAN
   DBI
   Mail::Sender"
if [[ "$POSTFIX_DB_TYPE" = "pgsql" ]] ; then
   _needed_cpan_modules="$_needed_cpan_modules
   DBD::Pg"
else
   _needed_cpan_modules="$_needed_cpan_modules
   DBD::mysql"
fi
for _module in $_needed_cpan_modules ; do
   cpanm -q --skip-installed $_module  >> "$log_file" 2>&1
   if [[ "$?" -ne 0 ]] ; then
      error "$(cat $tmp_err_msg)"
   fi
done
if $_failed ; then
   echo_failed
   error "$(cat $log_file)"
else
   echo_ok
fi

echo ""

echononl "\tCreate system group '$VACATION_GROUP'"
if ! grep -q "$VACATION_GROUP" /etc/group > /dev/null 2>&1 ; then
   addgroup --system --gid 65501 $VACATION_GROUP > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_ok
   fi
else
   echo_skipped
fi

echononl "\tCreate system user '$VACATION_USER'"
if ! grep -q "$VACATION_USER" /etc/passwd > /dev/null 2>&1 ; then
   adduser --system --home /var/spool/vacation --no-create-home --uid 65501 --gid 65501  --shell /usr/sbin/nologin $VACATION_USER > "$log_file" 2>&1
   
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_ok
   fi
else
   echo_skipped
fi

echononl "\tCreate directory '/var/spool/vacation'"
if [[ ! -d "/var/spool/vacation" ]]; then
   mkdir /var/spool/vacation > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_ok
   fi
else
   echo_skipped
fi

echononl "\tSet Permissions on directoy '/var/spool/vacation'"
chown -R ${VACATION_USER}:$VACATION_GROUP /var/spool/vacation > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   echo_failed
   error "$(cat $log_file)"
else
   echo_ok
fi

echononl "\tBackup existing script 'vacation.pl'"
if [[ -f "/var/spool/vacation/vacation.pl" ]] ; then
   mv /var/spool/vacation/vacation.pl /var/spool/vacation/vacation.pl.${backup_date} > "$log_file" 2>&1
   if [[ $? -ne 0 ]]; then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_ok
   fi
else
   echo_skipped
fi


echononl "\tCopy vacation script to '/var/spool/vacation/vacation.pl'"
if [[ -n "$(trim "$_vacation_script")" ]] ; then
   cp -a ${_vacation_script} /var/spool/vacation/ > "$log_file" 2>&1
   if [[ $? -eq 0 ]];then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   error "Vacation script not found!"
fi


# - Encoding does not work as exspected.
# -
# - NOTE:
# -    this IS NOT a fix, but a workaround
# -
echononl "\tWorkaround, because encoding does not work as exspected."
# - Vacation script changed. Since Version 3.2 we need another perl regexp.
# - The old one was: 
# -    perl -i -n -p -e "s/(\s*\'ctype\'\s* =>\s*)\'text\/plain.*$/\1\'text\/plain; charset=iso-8859-1\',/" \
# -
perl -i -n -p -e "s/(\s*\'Content-Type\'\s* =>\s*)\"text\/plain.*$/\1\"text\/plain; charset=iso-8859-1\",/" \
   /var/spool/vacation/vacation.pl > "$log_file" 2>&1
if [[ $? -eq 0 ]];then
   echo_ok
   info "This IS NOT a fix, but a workaround."
else
   echo_failed
   error "$(cat $log_file)"
fi

echononl "\tSet Permission on vacation script"
_failed=false
chown ${VACATION_USER}:$VACATION_GROUP /var/spool/vacation/vacation.pl > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
chmod 700 /var/spool/vacation/vacation.pl > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   _failed=true
fi
if $_failed ;then
   echo_failed
   error "$(cat $log_file)"
else
   echo_ok
fi

# - Script vacation.pl tries to reads setting from
# -
# -    /etc/mail/postfixadmin/vacation.conf
# -    /etc/postfixadmin/vacation.conf
# -
# - Instead of changing this script, we put the needed entries 
# - to file /etc/postfixadmin/vacation.conf:
# -
echononl "\tCreate directory '/etc/postfixadmin' "
if [[ ! -d "/etc/postfixadmin" ]]; then
   mkdir /etc/postfixadmin > "$log_file" 2>&1
   if [[ $? -eq 0 ]];then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

echononl "\tBackup existing file '/etc/postfixadmin/vacation.conf'"
if [[ -f "/etc/postfixadmin/vacation.conf" ]]; then
   mv /etc/postfixadmin/vacation.conf /etc/postfixadmin/vacation.conf.${backup_date} > "$log_file" 2>&1
   if [[ $? -eq 0 ]];then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

# - Create configuration file '/etc/postfixadmin/vacation.conf'
# -
echononl "\tCreate configuration file '/etc/postfixadmin/vacation.conf'"
if [[ "$POSTFIX_DB_TYPE" = "pgsql" ]]; then
   _db_type="Pg"
else
   _db_type="mysql"
fi

cat <<EOF > /etc/postfixadmin/vacation.conf 2> "$log_file"
\$db_type         = '$_db_type';
\$db_username     = '${POSTFIX_DB_USER}';
\$db_password     = '${POSTFIX_DB_PASS}';
\$db_name         = '${POSTFIX_DB_NAME}';
EOF
if [[ "$POSTFIX_DB_TYPE" = "mysql" ]]; then
   cat <<EOF >> /etc/postfixadmin/vacation.conf 2> "$log_file"
\$db_host         = '$VACATION_DB_HOST_MYSQL';
EOF
fi
cat <<EOF >> /etc/postfixadmin/vacation.conf 2> "$log_file"
\$vacation_domain = '${AUTOREPLY_HOSTNAME}';
\$syslog          = 0;
\$log_to_file     = 1;
\$logfile         = '/var/log/vacation.log';
\$log_level       = 1;
\$interval        = 60*60*24;
\$smtp_ssl        = '0';
1; # required final line - keeps perl happy.
EOF
if [[ $? -eq 0 ]];then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi


echononl "\tCreate logfile /var/log/vacation.log"
touch /var/log/vacation.log > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi
echononl "\tSet permissions on /var/log/vacation.log"
chown ${VACATION_USER}:$VACATION_GROUP /var/log/vacation.log > "$log_file" 2>&1
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi
echononl "\tConfigure logrotation for '/var/log/vacation.log'"
cat <<EOF > /etc/logrotate.d/vacation 2> "$log_file"
/var/log/vacation.log {
   daily
   start 0
   rotate 7
   missingok
   compress
   delaycompress
   notifempty
   create 640 vacation vacation
   copytruncate
}
EOF
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi


# - Create an entry in /etc/hosts for the (non-existant domain)
# - $AUTOREPLY_HOSTNAME 
# - 
# - add:
# -
# -    127.0.0.1 $AUTOREPLY_HOSTNAME
# -
echononl "\tCreate entry in /etc/hosts for '$AUTOREPLY_HOSTNAME'"
if ! grep -q "$AUTOREPLY_HOSTNAME" /etc/hosts > $log_file 2>&1 ; then
   perl -i -n -p -e"s#(^\s*127.0.0.1\s+localhost.*)#\1\n\n127.0.0.1 ${AUTOREPLY_HOSTNAME}#" /etc/hosts > $log_file 2>&1 
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

# - Define the transport type in the Postfix master file 
# - /etc/postfix/master.cf
# -
# -    vacation    unix  -       n       n       -       -       pipe
# -      flags=Rq user=vacation argv=/var/spool/vacation/vacation.pl -f ${sender} -- ${recipient}
# -
echononl "\tDefine transport for vacation in /etc/postfix/master.cf"
if ! grep -q -E "^\s*vacation\s+unix" /etc/postfix/master.cf > $log_file 2>&1 ; then
   cat <<EOF >> /etc/postfix/master.cf

vacation    unix  -       n       n       -       -       pipe
  flags=Rq user=vacation argv=/var/spool/vacation/vacation.pl -f \${sender} -- \${recipient}
EOF
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

# - Setup the transport maps file /etc/postfix/transport
# -
# - add line:
# -
# -    $AUTOREPLY_HOSTNAME   vacation:
# -
echononl "\tSetup the transport maps for vacation domain in '/etc/postfix/transport'"
if ! grep -q -E "^\s*$AUTOREPLY_HOSTNAME\s+vacation:" /etc/postfix/transport > $log_file 2>&1 ; then
   _failed=false
   echo "$AUTOREPLY_HOSTNAME   vacation:" >> /etc/postfix/transport 2> $log_file
   if [[ $? -ne 0 ]] ; then
      _failed=true
   fi
   postmap btree:/etc/postfix/transport > $log_file 2>&1
   if [[ $? -ne 0 ]] ; then
      _failed=true
   fi
   if [[ $? -ne 0 ]]; then
      _failed=true
   fi
   if $_failed ;then
      echo_failed
      error "$(cat $log_file)"
   else
      echo_ok
   fi
else
   echo_skipped
fi

check_entry_main_cf_arr["transport_maps"]="btree:/etc/postfix/transport"
# - Add 'btree:/etc/postfix/transport' ton parameter transport_maps in /etc/postfix/main.cf
# -
# -    take care the entry for transport_maps in /etc/postfix/main.cf
# -    contains "btree:/etc/postfix/transport"
# -
echononl "\tAdd 'btree:/etc/postfix/transport' to parameter transport_maps"
if ! grep -q "btree:/etc/postfix/transport" /etc/postfix/main.cf > $log_file 2>&1 ; then
   perl -i -n -p -e "s#(^transport_maps\s+=.*)#\1\n   btree:/etc/postfix/transport#" /etc/postfix/main.cf > $log_file 2>&1
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
      error "$(cat $log_file)"
   fi
else
   echo_skipped
fi

echononl "\tReload/Restart postfix"
if $systemd_supported ; then
   systemctl reload postfix > $log_file 2>&1
else
   /etc/init.d/postfix reload > $log_file 2>&1
fi
if [[ $? -eq 0 ]] ; then
   echo_ok
else
   echo_failed
   error "$(cat $log_file)"
fi

echo ""
clean_up 0