#!/bin/sh
#
# usenet newsgroup1 ... newsgroupn
#
# sendmail-compatible usenet transport agent.
#                   Jean-Francois Lamy (lamy@ai.toronto.edu), 89-06-02
#                   based on code by Rayan Zachariassen.
#
# The arguments are the newsgroups to which the article should be posted. A
# complete message, including To:, From: and From_ line expected on stdin.
# This assumes of course that the necessary magic has been done so that
# the mailer recognizes newsgroup name and decides to use the usenet transport
# agent on them.
#
# Notes:
#
# - this script should ultimately result in the invocation of a real
#   "inews" that deals with moderated newsgroups and invokes relaynews.
#   This version calls nntp, which results in calling a real inews on
#   the news server.
#   
# - The news program invoked by this script should trust From: lines
#   (otherwise workstation name hiding, full-name id generation and
#   all other smarts done by the mailer will be lost)
#
# - newsgroup "postnews" is ignored, and is used so one can mail
#   to a postnews alias a message with a Newsgroups: header, with
#   postnews aliased to postnews@usenet, where usenet is a fake host
#   handled by this transport agent.
#
# - Normally a From_ line of site!user and a From: line of user@site
#   should be produced. If your sendmail cannot be coerced into rewriting
#   envelope and headers differently you will need to kludge it here.
#
#
# ZMailer notes:
#
# - The default router.cf does the appropriate things, provided that
#   scheduler.cf contains:
#	usenet/*	1m	10 0 0	root	daemon	sm -c $channel usenet
#   sm.cf contains:
#	usenet	m	/local/lib/mail/bin/usenet	usenet $u
#      (adjust this to reflect the actual location of the installed copy of
#       this script, of course)
#   hosts.transport contains a line with:
#       usenet usenet!  
#   and that the aliases file contains aliases of the form
#       gradnews: gradnews@usenet
#      for all newsgroup names that don't have embedded ".").


# this version forwards the article via NNTP
NNTPSERVER="jarvis.csri" ; export NNTPSERVER
# make sure this does not end up calling this script again!
inews=/local/lib/news/nntp_inews

orgflag=0
org="`cat /local/share/news/organi?ation`"
[ "$org" ] || orgflag=1  # do not print empty Organization: header

from=/tmp/from$$

for i in $@
do
	groups="${groups+$groups,}$i"
done

awk "BEGIN		{ subject = 0; body = 0; skipping = 0 ;
			  newsgroups = 0; distribution = 0;
			  organization = $orgflag; }
body == 1		{ print; next }
/^$|^[ ][ \\t]*$/	{ if (!body) {
			    np = split(path,parts,\"!\");
			    if (!organization && np == 1)
			        print \"Organization: $org\";
			    if (!newsgroups) print \"Newsgroups: $groups\";
			    if (!subject) print \"Subject: (none)\"; 
			  }
			  print; body = 1; next
			}
/^To:|^X-To:|^Cc:|^Apparently-To:/	{ skipping=1 ; next }
/^Received:/		{ skipping = 1; next }
/^Newsgroups:/		{ newsgroups = 1; skipping = 0; printf(\"%s\",\$0);
		        if (\"$groups\" != \"\" && \"$groups\" != \"postnews\")
			     printf(\",%s\\n\",\"$groups\");
			  else printf(\"\\n\");
			  next }
/^Organi[sz]ation:/	{ organization = 1; skipping = 0; print; next }
/^Distribution:/	{ distribution = 1; skipping = 0; print; next }
/^Subject:/		{ subject = 1; skipping = 0; print; next }
/^From |^Return-Path:/	{ print \$2 > from ; path = \$2 ; skipping = 1; next }
/^[ 	]/		{ if (skipping) next }
/^[A-Za-z-]*:[ \\t]*$/	{ if (!body) next }
			{ print }
" from="$from" - >/tmp/usenet.$$-1

if [ -s $from ]; then
   (echo -n "Path: "; cat $from ; cat /tmp/usenet.$$-1 ) > /tmp/usenet.$$-2
   $inews /tmp/usenet.$$-2
fi
rm $from /tmp/usenet.$$-*
exit 0