#!/usr/bin/perl -w
#
# ==========================================================================
#
# ZoneMinder Update Script, $Date$, $Revision$
# Copyright (C) 2001-2008 Philip Coombes
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# ==========================================================================

=head1 NAME

zmtelemetry.pl - Send usage information to the ZoneMinder development team

=head1 SYNOPSIS

 zmtelemetry.pl

=head1 DESCRIPTION

This script collects usage information of the local system and sends it to the
ZoneMinder development team. This data will be used to determine things like
who and where our customers are, how big their systems are, the underlying
hardware and operating system, etc. This is being done for the sole purpoase of
creating a better product for our target audience. This script is intended to
be completely transparent to the end user, and can be disabled from the web
console under Options.

=head1 OPTIONS

none currently

=cut
use strict;
use bytes;

@EXTRA_PERL_LIB@
use ZoneMinder::Config qw(:all);
use ZoneMinder::Logger qw(:all);
use ZoneMinder::Database qw(:all);
use DBI;
use Getopt::Long;
use autouse 'Pod::Usage'=>qw(pod2usage);

$ENV{PATH}  = '/bin:/usr/bin:/usr/local/bin';
$ENV{SHELL} = '/bin/sh' if exists $ENV{SHELL};
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};

use constant CHECK_INTERVAL => (14*24*60*60); # Interval between version checks

# Setting these as contants for now. 
# Alternatively, we can put these in the dB and then retrieve using the Config hash.
use constant ZM_TELEMETRY_SERVER_NAME => "38092a65757da3cb5f949b6b94aa8fc9.us-east-1.aws.found.io";
use constant ZM_TELEMETRY_SERVER_PORT => "9243";

if ( $Config{ZM_TELEMETRY_DATA} )
{
    print( "Update agent starting at ".strftime( '%y/%m/%d %H:%M:%S', localtime() )."\n" );

    my $lastCheck = $Config{ZM_TELEMETRY_LAST_CHECK};

    while( 1 )
    {
        my $now = time();
        if ( ($now-$lastCheck) > CHECK_INTERVAL) )
        {
            Info( "Colleting data to send to ZoneMinder Telemetry server\n" );

            # This is where we gather our data. The following is just an oversimplified example.
            # Modify accordingly.

            # We should keep *BSD systems in mind when calling system commands
            my $result = runSysCmd("uname -a")."\n";
            my $result .= "ZM_DYN_CURR_VERSION: ".Config{ZM_DYN_CURR_VERSION};

            Info( "Sending data to ZoneMinder Telemetry server\n" );

            if ( sendData($result) ) {
                $lastCheck = $now;

                my $lc_sql = "update Config set Value = ? where Name = 'ZM_DYN_LAST_CHECK'";
                my $lc_sth = $dbh->prepare_cached( $lc_sql ) or die( "Can't prepare '$lc_sql': ".$dbh->errstr() );
                my $lc_res = $lc_sth->execute( $lastCheck ) or die( "Can't execute: ".$lc_sth->errstr() );
            }
        }
        sleep( 3600 );
    }
    print( "Update agent exiting at ".strftime( '%y/%m/%d %H:%M:%S', localtime() )."\n" );
}

# Find, verify, then run the supplied system command
sub runSysCmd {
    my $msg = shift;
    my @arguments = split(/ /,$msg);
    chomp($arguments[0]);
    my $path  = qx( which $arguments[0] );

    my $status = $? >> 8;
    my $result = "";
    if ( !$path || $status ) {
        Warning( "Cannot find the $arguments[0] executable." );
    } else {
        chomp($path);
        $arguments[0] = $path;
        my $cmd = join(" ",@arguments);
        my $result = qx( $cmd );
    }
    return chomp($result);
}

# Upload message data to ZoneMinder telemetry server
sub sendData {
    my $msg = shift;

    use LWP::UserAgent;

    my $ua = LWP::UserAgent->new;
    my $server_endpoint = "https://".ZM_TELEMETRY_SERVER_NAME.":".ZM_TELEMETRY_SERVER_PORT."/zmtelemetry/testing/";

    if ( $Config{ZM_UPDATE_CHECK_PROXY} ) {
        $ua->proxy( "https", $Config{ZM_UPDATE_CHECK_PROXY} );
    }

    # set custom HTTP request header fields
    my $req = HTTP::Request->new(POST => $server_endpoint);
    $req->header('content-type' => 'application/x-www-form-urlencoded');
    $req->header('content-length' => length($msg));
    $req->header('connection' => 'Close');
 
    $req->content($msg);
 
    my $resp = $ua->request($req);
    my success = 0;
    if ($resp->is_success) {
        my $message = $resp->decoded_content;
        Info("Telemetry data successfully uploaded.");
        Debug("Telemetry server upload success response message: $message\n");
        $success = 1;
    } else {
        Warning("Telemetry server returned HTTP POST error code: ", $resp->code, "\n";
        Debug("Telemetry server upload failure response message: ", $resp->message, "\n";
    }
    return $success;
}