#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#

# Adds an email address rule to the email configuration

# License
# =======
#
# Copyright (C) 2015-2016 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

PROJECT_NAME='freedombone'

export TEXTDOMAIN=${PROJECT_NAME}-addemail
export TEXTDOMAINDIR="/usr/share/locale"

MYUSERNAME=$USER
EMAILADDRESS=
SUBJECT_TEXT=
GROUP_NAME=
PUBLIC='no'

function show_help {
    echo ''
    echo $"${PROJECT_NAME}-addemail -u [username] -e [email address] -s [subject text] -g [group name] --public [yes|no]"
    echo ''
    exit 0
}

while [[ $# > 1 ]]
do
    key="$1"

    case $key in
    -h|--help)
        show_help
        ;;
    -u|--user)
        shift
        MYUSERNAME="$1"
        ;;
    -e|--email)
        shift
        EMAILADDRESS="$1"
        ;;
    -s|--subject)
        shift
        SUBJECT_TEXT="$1"
        ;;
    -g|--group)
        shift
        GROUP_NAME="$1"
        ;;
    -p|--public)
        shift
        PUBLIC="$1"
        ;;
    *)
        # unknown option
        ;;
    esac
    shift
done

if ! [[ $MYUSERNAME && $GROUP_NAME ]]; then
    show_help
fi

if [ ${#EMAILADDRESS} -lt 2 ]; then
    if [ ${#SUBJECT_TEXT} -lt 2 ]; then
    show_help
    fi
fi

MUTTRC=/home/$MYUSERNAME/.muttrc
PM=/home/$MYUSERNAME/.procmailrc
LISTDIR=/home/$MYUSERNAME/Maildir/$GROUP_NAME

proc_rule="  * ^From:.*$EMAILADDRESS"
proc_comment="# Email rule for $EMAILADDRESS -> $GROUP_NAME"
if [ ${#SUBJECT_TEXT} -gt 0 ]; then
    proc_rule="  * ^From:.*$EMAILADDRESS"
    proc_comment="# Email rule for '$SUBJECT_TEXT' -> $GROUP_NAME"
fi

if [ ! -d "$LISTDIR" ]; then
    mkdir -m 700 $LISTDIR
    mkdir -m 700 $LISTDIR/tmp
    mkdir -m 700 $LISTDIR/new
    mkdir -m 700 $LISTDIR/cur
fi
chown -R $MYUSERNAME:$MYUSERNAME $LISTDIR
if ! grep -q "$proc_comment" $PM; then
    if [[ $PUBLIC != "yes" ]]; then
    # private emails go after the encryption stage
    echo '' >> $PM
    echo "$proc_comment" >> $PM
    echo ":0" >> $PM
    echo "$proc_rule" >> $PM
    echo "$LISTDIR/new" >> $PM
    echo "# End of rule" >> $PM
    else
    # public emails are copied before the encryption stage
    if ! grep -q '# encrypt' $PM; then
        echo '' >> $PM
        echo "$proc_comment" >> $PM
        echo ":0" >> $PM
        echo "$proc_rule" >> $PM
        echo "$LISTDIR/new" >> $PM
        echo "# End of rule" >> $PM
    else
        filter=$(echo "$proc_comment\n:0\n${proc_rule}\n$LISTDIR/new\n# End of rule\n")
        sed -i "/# encrypt/i ${filter}" $PM
    fi
    fi
    chown $MYUSERNAME:$MYUSERNAME $PM
fi

if [ ! -f "$MUTTRC" ]; then
    cp /etc/Muttrc $MUTTRC
    chown $MYUSERNAME:$MYUSERNAME $MUTTRC
fi

PROCMAILLOG=/home/$MYUSERNAME/log
if [ ! -d $PROCMAILLOG ]; then
    mkdir $PROCMAILLOG
    chown -R $MYUSERNAME:$MYUSERNAME $PROCMAILLOG
fi

MUTT_MAILBOXES=$(grep "mailboxes =" $MUTTRC)
if [[ $MUTT_MAILBOXES != *$GROUP_NAME* ]]; then
    if ! grep -q "=$GROUP_NAME" $MUTTRC; then
    sed -i "s|$MUTT_MAILBOXES|$MUTT_MAILBOXES =$GROUP_NAME|g" $MUTTRC
    chown $MYUSERNAME:$MYUSERNAME $MUTTRC
    fi
fi

exit 0