SMS Server Tools 3 event handler script (mainly used for converting messages to UTF-8 encoding, for example, those messages with CJK characters included)

smstools-eventhandler.sh

#!/bin/bash
#
# This script processes events from smsd. 
# It mainly will converts SMS encoded with UCS2 encoding to UTF-8 format expected by many other applications.
# To use it, edit your /etc/smsd.conf and add the following line:
#
#    eventhandler = /path/to/smstools-eventhandler.sh
#
# When a new message is received in /var/spool/incoming/, message files with following header line will be converted:
#
#    Alphabet: UCS2
#
# Download SMS tools from http://smstools3.kekekasvi.com/
# Latest version of this script at https://gist.github.com/x-magic/90cdecee4ffe940839cac1024e8ae02b
# Author: Bill Gong <[email protected]>
# With contribution from: Artur Bodera <[email protected]>
#

case $1 in
SENT)
  # TODO: Action when message is confirmed sent
  ;;
RECEIVED)
  # When received a message, convert to UTF-8 encoding if required
  if sed -e '/^$/ q' < "$2" | grep "^Alphabet: UCS2" > /dev/null; then
    TMPFILE=`mktemp /tmp/smsd_XXXXXX`
    sed -e '/^$/ q' < "$2" | sed -e 's/Alphabet: UCS2/Alphabet: UTF-8/g' > $TMPFILE
    sed -e '1,/^$/ d' < $2 | iconv -f UNICODEBIG -t UTF-8 >> $TMPFILE
    mv -f $TMPFILE $2
  fi
  ;;
FAILED)
  # TODO: Action when failed to send message
  ;;
REPORT)
  # TODO: Not exactly sure what is this
  ;;
CALL)
  # TODO: Action when received a call (why is this not working?)
  ;;
*)
  # When unknown status is received, terminate the script with exit code 1
  exit 1
  ;;
esac

exit 0