#!/bin/ksh
#
# Handle the tagging and bouncing of spam messages for customers.  The
# customer's email address is extracted from the environment information
# and is then passed to "spamc" for examination.  The message is then
# either delivered (tagged) to the mailbox, or if requested, bounced
# back to the sender as an undeliverable message.
#
# It should be installed in the .qmail file as so:
#  |spamassassin.sh
#
# or, if you want to deliver the tagged mail somewhere else:
#  |spamassassin.sh email_address
#
# Requires: spamc, spamd, qmail, 822field (from the mess822 package),
# reformail, maildir (which is a script that calls safecat correctly.)
#
# Copyright (c) 2002 by Robert James Kaes <rjkaes@flarenet.com>
# All rights reserved.
#

PATH=/bin:/usr/bin:/usr/local/bin

# RECIPIENT is an environmental variable which contains an email address
# like: flarenet-com-rjkaes@flarenet.com
# In other words, the domain is prepended to the email address.  This
# script removes the prepended part and returns just the email address.

recip=$(echo "$RECIPIENT" | tr "A-Z" "a-z")
encoded_domain=$(echo "$recip" | sed -e 's/.*@\(.*\)$/\1/' | tr '.' '-')
user=$(echo "$recip" | sed -e "s/$encoded_domain-//")

# Scan the message
message_name=$(/usr/bin/spamc -f -u"$user" | reformail -A"X-SA-UserName: $user" | maildir ./Maildir/) 
if [ $? -ne 0 ]; then
  # soft failure
  exit 111
fi

# Find the message's score; again, need to scale it
message_score=$(cat ./Maildir/new/$message_name | 822field 'X-Spam-Status' | grep -i 'yes' | sed -e 's/^.*hits=\([0-9.]*\).*$/\1/')

# Check to see if the message was tagged as spam
if [ -n "$message_score" ]; then
    # it's a none empty string, so scale the value
    message_score=$(echo "$message_score * 100" | bc | sed -e 's/\..*$//')

    # Get the bounce spam value; it's an float so it needs to be scaled
    bounce_spam=$(echo "$user" | spam_bounce | awk -F: '{print $2}')

    # If the score is zero, change it to the default score (13.75)
    if [ $bounce_spam = "0" ]; then
        bounce_spam="1375"
    else
        bounce_spam=$(echo "$bounce_spam * 100" | bc | sed -e 's/\..*$//')
    fi

    # If the message's score it greater than the bounce limit, bounce
    # the message
    if [[ $message_score -ge $bounce_spam ]]; then
    	rm -f ./Maildir/new/$message_name
    	# stop further processing of .qmail file
    	exit 100
    fi
fi

# Pick an output command based on whether an email address was given
# on the first line
if [ $# -gt 0 ]; then
    cat ./Maildir/new/$message_name | /usr/sbin/qmail-inject $1
    ret=$?
    rm -f ./Maildir/new/$message_name

    if [ $ret -ne 0 ]; then
        exit 111
    fi
fi

# Message has been delivered successfully.
exit 0