##  rmgroup control message handler.
##
##  Copyright 2001 by Marco d'Itri <md@linux.it>
##
##  Redistribution and use in source and binary forms, with or without
##  modification, are permitted provided that the following conditions
##  are met:
##
##   1. Redistributions of source code must retain the above copyright
##      notice, this list of conditions and the following disclaimer.
##
##   2. Redistributions in binary form must reproduce the above copyright
##      notice, this list of conditions and the following disclaimer in the
##      documentation and/or other materials provided with the distribution.

use strict;

sub control_rmgroup {
    my (
        $par, $sender, $replyto, $site, $action, $log, $approved,
        $article,
    ) = @_;
    my ($groupname) = @$par;

    my $head = $article->head;
    my @headers = split(/\r?\n/, $head->stringify);
    my @body = split(/\r?\n/, $article->stringify_body);

    # Scan active to see what sort of change we are making.
    open(ACTIVE, $INN::Config::active)
      or logdie("Cannot open $INN::Config::active: $!");
    my @oldgroup;
    while (<ACTIVE>) {
        next unless /^(\Q$groupname\E)\s\d+\s\d+\s(\w)/;
        @oldgroup = split /\s+/;
        last;
    }
    close ACTIVE;
    my $status;
    if (not @oldgroup) {
        $status = 'not change';
    } elsif (not $approved) {
        $status = 'be unapproved';
    } else {
        $status = 'be removed';
    }

    if ($action eq 'mail' and $status !~ /(not change|be unapproved)/) {
        my $mail = sendmail("rmgroup $groupname $sender");
        print $mail <<END;
$sender asks for $groupname
to $status.

If this is acceptable, type:
  $INN::Config::newsbin/ctlinnd rmgroup $groupname

And do not forget to remove the corresponding description, if any,
from your $INN::Config::pathdb/newsgroups file.

The control message follows:

END
        print $mail map { s/^~/~~/; "$_\n" } @headers;
        print $mail "\n";
        print $mail map { s/^~/~~/; "$_\n" } @body;
        close $mail or logdie("Cannot send mail: $!");
    } elsif ($action eq 'log') {
        if ($log) {
            logger(
                $log, "skipping rmgroup $groupname"
                  . " $sender (would $status)", $article,
            );
        } else {
            logmsg("skipping rmgroup $groupname $sender (would $status)");
        }
    } elsif ($action eq 'doit' and $status !~ /(not change|be unapproved)/) {
        ctlinnd('rmgroup', $groupname);
        # Update newsgroups too.
        my $lockfile = "$INN::Config::locks/LOCK.newsgroups";

        # Acquire a lock.
        INN::Utils::Shlock::lock($lockfile, 60)
          or logdie("Cannot create lockfile $lockfile");

        open(NEWSGROUPS, $INN::Config::newsgroups)
          or logdie("Cannot open $INN::Config::newsgroups: $!");
        my $tempfile = "$INN::Config::newsgroups.$$";
        open(TEMPFILE, ">$tempfile") or logdie("Cannot open $tempfile: $!");
        while (<NEWSGROUPS>) {
            print TEMPFILE $_ if not /^\Q$groupname\E\s/;
        }
        close TEMPFILE;
        close NEWSGROUPS;
        rename($tempfile, $INN::Config::newsgroups)
          or logdie("Cannot rename $tempfile: $!");
        unlink $tempfile;

        # Unlock.
        INN::Utils::Shlock::unlock($lockfile);

        logger($log, "rmgroup $groupname $status $sender", $article)
          if $log;
    }
}

1;
