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#!/usr/bin/perl
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=head1 NAME

rt-email-group-admin - Command line tool for administrating NotifyGroup actions

=head1 SYNOPSIS

    rt-email-group-admin --list
    rt-email-group-admin --create 'Notify foo team' --group Foo
    rt-email-group-admin --create 'Notify foo team as comment' --comment --group Foo
    rt-email-group-admin --create 'Notify group Foo and Bar' --group Foo --group Bar
    rt-email-group-admin --create 'Notify user foo@bar.com' --user foo@bar.com
    rt-email-group-admin --create 'Notify VIPs' --user vip1@bar.com
    rt-email-group-admin --add 'Notify VIPs' --user vip2@bar.com --group vip1 --user vip3@foo.com
    rt-email-group-admin --rename 'Notify VIPs' --newname 'Inform VIPs'
    rt-email-group-admin --switch 'Notify VIPs'
    rt-email-group-admin --delete 'Notify user foo@bar.com'

=head1 DESCRIPTION

This script list, create, modify or delete scrip actions in the RT DB. Once
you've created an action you can use it in a scrip.

For example you can create the following action using this script:

    rt-email-group-admin --create 'Notify developers' --group 'Development Team'

Then you can add the followoing scrip to your Bugs queue:
    
    Condition: On Create
    Action:    Notify developers
    Template:  Transaction
    Stage:     TransactionCreate

Your development team will be notified on every new ticket in the queue.

=cut

use warnings;
use strict;

# fix lib paths, some may be relative
BEGIN {
    require File::Spec;
    my @libs = ("lib", "local/lib");
    my $bin_path;

    for my $lib (@libs) {
        unless ( File::Spec->file_name_is_absolute($lib) ) {
            unless ($bin_path) {
                if ( File::Spec->file_name_is_absolute(__FILE__) ) {
                    $bin_path = ( File::Spec->splitpath(__FILE__) )[1];
                }
                else {
                    require FindBin;
                    no warnings "once";
                    $bin_path = $FindBin::Bin;
                }
            }
            $lib = File::Spec->catfile( $bin_path, File::Spec->updir, $lib );
        }
        unshift @INC, $lib;
    }

}

use Getopt::Long qw(GetOptions);
Getopt::Long::Configure( "pass_through" );

our $cmd = 'usage';
our $opts = {};

sub parse_args {
    my $tmp;
    if ( GetOptions( 'list' => \$tmp ) && $tmp ) {
        $cmd = 'list';
    }
    elsif ( GetOptions( 'create=s' => \$tmp ) && $tmp ) {
        $cmd = 'create';
        $opts->{'name'} = $tmp;
        $opts->{'groups'} = [];
        $opts->{'users'} = [];
        GetOptions( 'comment' => \$opts->{'comment'} );
        GetOptions( 'group:s@' => $opts->{'groups'} );
        GetOptions( 'user:s@' => $opts->{'users'} );
        unless ( @{ $opts->{'users'} } + @{ $opts->{'groups'} } ) {
            usage();
            exit(-1);
        }
    }
    elsif ( GetOptions( 'add=s' => \$tmp ) && $tmp ) {
        $cmd = 'add';
        $opts->{'name'} = $tmp;
        $opts->{'groups'} = [];
        $opts->{'users'} = [];
        GetOptions( 'group:s@' => $opts->{'groups'} );
        GetOptions( 'user:s@' => $opts->{'users'} );
        unless ( @{ $opts->{'users'} } + @{ $opts->{'groups'} } ) {
            usage();
            exit(-1);
        }
    }
    elsif ( GetOptions( 'switch=s' => \$tmp ) && $tmp ) {
        $cmd = 'switch';
        $opts->{'name'} = $tmp;
    }
    elsif ( GetOptions( 'rename=s' => \$tmp ) && $tmp ) {
        $cmd = 'rename';
        $opts->{'name'} = $tmp;
        GetOptions( 'newname=s' => \$opts->{'newname'} );
        unless ( $opts->{'newname'} ) {
            usage();
            exit(-1);
        }
    }
    elsif ( GetOptions( 'delete=s' => \$tmp ) && $tmp) {
        $cmd = 'delete';
        $opts->{'name'} = $tmp;
    } else {
        $cmd = 'usage';
    }
    
    return;
}

sub usage {
    require Pod::Usage;
    Pod::Usage::pod2usage({ verbose => 2 });
}

my $help;
if ( GetOptions( 'help|h' => \$help ) && $help ) {
    usage();
    exit;
}

parse_args();

require RT;
RT->LoadConfig;
RT->Init;

require RT::Principal;
require RT::User;
require RT::Group;
require RT::ScripActions;


{
    eval "main::$cmd()";
    if ( $@ ) {
        print STDERR $@ ."\n";
    }
}

exit(0);

=head1 USAGE

rt-email-group-admin --COMMAND ARGS

=head1 COMMANDS

=head2 list

Lists actions and its descriptions.

=cut

sub list {
    my $actions = _get_our_actions();
    while( my $a = $actions->Next ) {
        _list( $a );
    }
    return;
}

sub _list {
    my $action = shift;

    print "Name: ". $action->Name() ."\n";
    print "Module: ". $action->ExecModule() ."\n";

    my @princ = argument_to_list( $action );

    print "Members: \n";
    foreach( @princ ) {
        my $obj = RT::Principal->new( RT->SystemUser );
        $obj->Load( $_ );
        next unless $obj->id;

        print "\t". $obj->PrincipalType;
        print "\t=> ". $obj->Object->Name;
        print "(Disabled!!!)" if $obj->Disabled;
        print "\n";
    }
    print "\n";
    return;
}

=head2 create NAME [--comment] [--group GNAME] [--user UNAME]

Creates new action with NAME and adds users and/or groups to its
recipient list. Would be notify as comment if --comment specified.

=cut

sub create {
    my $actions = RT::ScripActions->new( RT->SystemUser );
    $actions->Limit(
        FIELD => 'Name',
        VALUE => $opts->{'name'},
    );
    if ( $actions->Count ) {
        print STDERR "ScripAction '". $opts->{'name'} ."' allready exists\n";
        exit(-1);
    }

    my @groups = _check_groups( @{ $opts->{'groups'} } );
    my @users  = _check_users( @{ $opts->{'users'} } );    
    unless ( @users + @groups ) {
        print STDERR "List of groups and users is empty\n";
        exit(-1);
    }

    my $action = __create_empty( $opts->{'name'}, $opts->{'comment'} );

    __add( $action, $_ ) foreach( @users );
    __add( $action, $_ ) foreach( @groups );

    return;
}

sub __create_empty {
    my $name = shift;
    my $as_comment = shift || 0;
    require RT::ScripAction;
    my $action = RT::ScripAction->new( RT->SystemUser );
    $action->Create(
        Name => $name,
        Description => "Created with rt-email-group-admin script",
        ExecModule => $as_comment? 'NotifyGroupAsComment': 'NotifyGroup',
        Argument => '',
    );

    return $action;
}

sub _check_groups
{
    return grep { $_ ? 1: do { print STDERR "Group '$_' skipped, doesn't exist\n"; 0; } }
        map { __check_group($_) } @_;
}

sub __check_group
{
    my $instance = shift;
    require RT::Group;
    my $obj = RT::Group->new( RT->SystemUser );
    $obj->LoadUserDefinedGroup( $instance );
    return $obj->id ? $obj : undef;
}

sub _check_users
{
    return grep { $_ ? 1: do { print STDERR "User '$_' skipped, doesn't exist\n"; 0; } }
        map { __check_user($_) } @_;
}

sub __check_user
{
    my $instance = shift;
    require RT::User;
    my $obj = RT::User->new( RT->SystemUser );
    $obj->Load( $instance );
    return $obj->id ? $obj : undef;
}

=head2 add NAME [--group GNAME] [--user UNAME]

Adds groups and/or users to recipients of the action NAME.

=cut

sub add {
    my $action = _get_action_by_name( $opts->{'name'} );
    unless ( $action ) {
        print STDERR "ScripAction '". $opts->{'name'} ."' doesn't exist\n";
        exit(-1);
    }

    my @groups = _check_groups( @{ $opts->{'groups'} } );
    my @users = _check_users( @{ $opts->{'users'} } );
    
    unless ( @users + @groups ) {
        print STDERR "List of groups and users is empty\n";
        exit(-1);
    }

    __add( $action, $_ ) foreach @users;
    __add( $action, $_ ) foreach @groups;

    return;
}

sub __add
{
    my $action = shift;
    my $obj = shift;

    my @cur = argument_to_list( $action );

    my $id = $obj->id;
    return if grep $_ == $id, @cur;

    push @cur, $id;

    return $action->__Set( Field => 'Argument', Value => join(',', @cur) );
}

=head2 delete NAME

Deletes action NAME if scrips doesn't use it.

=cut

sub delete {
    my $action = _get_action_by_name( $opts->{'name'} );
    unless ( $action ) {
        print STDERR "ScripAction '". $opts->{'name'} ."' doesn't exist\n";
        exit(-1);
    }

    require RT::Scrips;
    my $scrips = RT::Scrips->new( RT->SystemUser );
    $scrips->Limit( FIELD => 'ScripAction', VALUE => $action->id );
    if ( $scrips->Count ) {
        my @sid;
        while( my $s = $scrips->Next ) {
            push @sid, $s->id;
        }
        print STDERR "ScripAction '". $opts->{'name'} ."'"
            . " is in use by Scrip(s) ". join( ", ", map "#$_", @sid )
            . "\n";
        exit(-1);
    }

    return __delete( $action );
}

sub __delete {
    require DBIx::SearchBuilder::Record;
    return DBIx::SearchBuilder::Record::Delete( shift );
}

sub _get_action_by_name {
    my $name = shift;
    my $actions = _get_our_actions();
    $actions->Limit(
        FIELD => 'Name',
        VALUE => $name
    );

    if ( $actions->Count > 1 ) {
        print STDERR "More then one ScripAction with name '$name'\n";
    }

    return $actions->First;
}

=head2 switch NAME

Switch action NAME from notify as correspondence to comment and back.

=cut

sub switch {
    my $action = _get_action_by_name( $opts->{'name'} );
    unless ( $action ) {
        print STDERR "ScripAction '". $opts->{'name'} ."' doesn't exist\n";
        exit(-1);
    }

    my %h = (
        NotifyGroup => 'NotifyGroupAsComment',
        NotifyGroupAsComment => 'NotifyGroup'
    );

    return $action->__Set(
        Field => 'ExecModule',
        Value => $h{ $action->ExecModule }
    );
}

=head2 rename NAME --newname NEWNAME

Renames action NAME to NEWNAME.

=cut

sub rename {
    my $action = _get_action_by_name( $opts->{'name'} );
    unless ( $action ) {
        print STDERR "ScripAction '". $opts->{'name'} ."' doesn't exist\n";
        exit(-1);
    }

    my $actions = RT::ScripActions->new( RT->SystemUser );
    $actions->Limit( FIELD => 'Name', VALUE => $opts->{'newname'} );
    if ( $actions->Count ) {
        print STDERR "ScripAction '". $opts->{'newname'} ."' allready exists\n";
        exit(-1);
    }

    return $action->__Set(
        Field => 'Name',
        Value => $opts->{'newname'},
    );
}

=head2 NOTES

If command has option --group or --user then you can use it more then once,
if other is not specified.

=cut

###############
#### Utils ####
###############

sub argument_to_list {
    my $action = shift;
    require RT::Action::NotifyGroup;
    return RT::Action::NotifyGroup->__SplitArg( $action->Argument );
}

sub _get_our_actions {
    my $actions = RT::ScripActions->new( RT->SystemUser );
    $actions->Limit(
        FIELD => 'ExecModule',
        VALUE => 'NotifyGroup',
        ENTRYAGGREGATOR => 'OR',
    );
    $actions->Limit(
        FIELD => 'ExecModule',
        VALUE => 'NotifyGroupAsComment',
        ENTRYAGGREGATOR => 'OR',
    );

    return $actions;
}

=head1 AUTHOR

Ruslan U. Zakirov E<lt>ruz@bestpractical.comE<gt>

=head1 SEE ALSO

L<RT::Action::NotifyGroup>, L<RT::Action::NotifyGroupAsComment>

=cut