#!/bin/bash
#
# Tx Tony Fung
# More info here https://notes.sagredo.eu/en/qmail-notes-185/expunging-expired-junk-and-trash-emails-with-dovecot-124.html#comment1835
#

DOVEADM="/usr/local/dovecot/bin/doveadm"
CONF="/usr/local/dovecot/etc/dovecot/dovecot-expunge.conf"
LOG="/var/log/dovecot/dovecot-expunge.log"

if [ ! -e "$CONF" ]; then
   echo $(date +"%Y%m%d %T") \
   "aborted with $CONF not found" >> $LOG
   exit
fi

while read line; do
         # Skip commented and blank lines:
         if [[ ${line:0:1} = "#" ]] || [ -z "$line" ]; then
            continue
         fi

         # Put fields to variables per line:
         DOMAIN=$(echo $line|cut -d"|" -f1)
         USER=$(echo $line|cut -d"|" -f2)
         DAY=$(echo $line|cut -d"|" -f3)
         FOLDER=$(echo $line|cut -d"|" -f4)

         # List mailbox folders per user:
         $DOVEADM mailbox list -u "$USER@$DOMAIN" | \
         while read list; do
                  if [[ "$USER" = "*" ]]; then
                     u=$(echo $list|cut -d" " -f1)
                     f=$(echo $list|sed 's/[^ ]* //')
                  else
                     u="$USER@$DOMAIN"
                     f=$list
                  fi

                  if [[ "$FOLDER" = "*" ]]; then
                     $DOVEADM expunge -u $u mailbox "$f" savedbefore "$DAY""d"
                     echo $(date +"%Y%m%d %T") \
                     "expunged $u:$f:$DAY days before" >> $LOG
                  else
                     if [ -z "${FOLDER##*$f*}" ]; then
                        $DOVEADM expunge -u $u mailbox "$f" savedbefore "$DAY""d"
                        echo $(date +"%Y%m%d %T") \
                        "expunged $u:$f:$DAY days before" >> $LOG
                     fi
                  fi
         done
done < $CONF

exit