#!/bin/sh
#
#       @(#)procmail_panix 1996/12/19 Anne Bennett
#
# Download Panix's procmailrc file for blocking spam,
# reformat it for our site, and compare it to what
# we've got.  Report if different, and prepare new file.

PATH=/local/paths:/usr/bin:/sbin:/usr/sbin
export PATH


thisprog=procmail_panix
logger="logger -p mail.info ${thisprog}:"

url="http://www.panix.com/rc.shared"
cur_rc=/local/etc/procmail/spam/tag-panix
new_rc=/local/etc/procmail/spam/NEW.tag-panix
mailto="anne"

tmp_new=/tmp/${thisprog}.$$.tmp_new
tmp_old=/tmp/${thisprog}.$$.tmp_old
tmp_diff=/tmp/${thisprog}.$$.tmp_diff

all_tmp="${tmp_new} ${tmp_old} ${tmp_diff}"


# Start.
#
${logger} starting.


# Download and format Panix material; note the date and time.
#
lynx -dump -source ${url} \
   | sed -e 's/^:0:/:0 Hf/'  \
         -e 's/^\$TRASH/| formail -b -f -A "$trash_header siteban per-panix"/' \
   > ${tmp_new}
down_date=`date '+%Y/%m/%d %H:%M:%S %Z'`


# Isolate our current Panix-derived material.
#
cat ${cur_rc} \
   | sed -n '/^# ========== Panix-derived material below ==========$/,$p' \
   | tail +2 \
   >> ${tmp_old}


# Are they different?  If not, clean up and exit quietly.
#
diff ${tmp_old} ${tmp_new} > ${tmp_diff}
if [ ! -s ${tmp_diff} ]; then
   # No changes.
   ${logger} no change.
   rm -f ${all_tmp}
   ${logger} end of run.
   exit
fi


# There were changes!  Prepare a new file and notify maintainer.
#
${logger} changes found.
cat ${cur_rc} \
   | sed -n '1,/^# ========== Panix-derived material below ==========$/p' \
   | sed -e "s%^# Last download on .*%# Last download on ${down_date}%" \
   > ${new_rc}
cat ${tmp_new} >> ${new_rc}

${logger} notifying maintainer.
( echo ""
  echo "New Panix procmail data is in ${new_rc}"
  echo ""
  echo "Differences follow:"
  echo ""
  echo "===================================="
  echo ""
  cat ${tmp_diff}
) | mailx -s "New Panix procmail data ready" ${mailto}


# Clean up and leave
rm -f ${all_tmp}
${logger} end of run.
exit