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[usit-rt.git] / lib / RT.pm

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use strict;
use warnings;

package RT;


use File::Spec ();
use Cwd ();

use vars qw($Config $System $SystemUser $Nobody $Handle $Logger $_Privileged $_Unprivileged $_INSTALL_MODE);

use vars qw($BasePath
 $EtcPath
 $BinPath
 $SbinPath
 $VarPath
 $LexiconPath
 $PluginPath
 $LocalPath
 $LocalEtcPath
 $LocalLibPath
 $LocalLexiconPath
 $LocalPluginPath
 $MasonComponentRoot
 $MasonLocalComponentRoot
 $MasonDataDir
 $MasonSessionDir);


RT->LoadGeneratedData();

=head1 NAME

RT - Request Tracker

=head1 SYNOPSIS

A fully featured request tracker package

=head1 DESCRIPTION

=head2 INITIALIZATION

=head2 LoadConfig

Load RT's config file.  First, the site configuration file
(F<RT_SiteConfig.pm>) is loaded, in order to establish overall site
settings like hostname and name of RT instance.  Then, the core
configuration file (F<RT_Config.pm>) is loaded to set fallback values
for all settings; it bases some values on settings from the site
configuration file.

In order for the core configuration to not override the site's
settings, the function C<Set> is used; it only sets values if they
have not been set already.

=cut

sub LoadConfig {
    require RT::Config;
    $Config = RT::Config->new;
    $Config->LoadConfigs;
    require RT::I18N;

    # RT::Essentials mistakenly recommends that WebPath be set to '/'.
    # If the user does that, do what they mean.
    $RT::WebPath = '' if ($RT::WebPath eq '/');

    # fix relative LogDir and GnuPG homedir
    unless ( File::Spec->file_name_is_absolute( $Config->Get('LogDir') ) ) {
        $Config->Set( LogDir =>
              File::Spec->catfile( $BasePath, $Config->Get('LogDir') ) );
    }

    my $gpgopts = $Config->Get('GnuPGOptions');
    unless ( File::Spec->file_name_is_absolute( $gpgopts->{homedir} ) ) {
        $gpgopts->{homedir} = File::Spec->catfile( $BasePath, $gpgopts->{homedir} );
    }

    return $Config;
}

=head2 Init

L<Connects to the database|/ConnectToDatabase>, L<initilizes system
objects|/InitSystemObjects>, L<preloads classes|/InitClasses>, L<sets
up logging|/InitLogging>, and L<loads plugins|/InitPlugins>.

=cut

sub Init {

    CheckPerlRequirements();

    InitPluginPaths();

    #Get a database connection
    ConnectToDatabase();
    InitSystemObjects();
    InitClasses();
    InitLogging();
    InitPlugins();
    RT::I18N->Init;
    RT->Config->PostLoadCheck;

}

=head2 ConnectToDatabase

Get a database connection. See also L</Handle>.

=cut

sub ConnectToDatabase {
    require RT::Handle;
    $Handle = RT::Handle->new unless $Handle;
    $Handle->Connect;
    return $Handle;
}

=head2 InitLogging

Create the Logger object and set up signal handlers.

=cut

sub InitLogging {

    # We have to set the record separator ($, man perlvar)
    # or Log::Dispatch starts getting
    # really pissy, as some other module we use unsets it.
    $, = '';
    use Log::Dispatch 1.6;

    my %level_to_num = (
        map( { $_ => } 0..7 ),
        debug     => 0,
        info      => 1,
        notice    => 2,
        warning   => 3,
        error     => 4, 'err' => 4,
        critical  => 5, crit  => 5,
        alert     => 6,
        emergency => 7, emerg => 7,
    );

    unless ( $RT::Logger ) {

        $RT::Logger = Log::Dispatch->new;

        my $stack_from_level;
        if ( $stack_from_level = RT->Config->Get('LogStackTraces') ) {
            # if option has old style '\d'(true) value
            $stack_from_level = 0 if $stack_from_level =~ /^\d+$/;
            $stack_from_level = $level_to_num{ $stack_from_level } || 0;
        } else {
            $stack_from_level = 99; # don't log
        }

        my $simple_cb = sub {
            # if this code throw any warning we can get segfault
            no warnings;
            my %p = @_;

            # skip Log::* stack frames
            my $frame = 0;
            $frame++ while caller($frame) && caller($frame) =~ /^Log::/;
            my ($package, $filename, $line) = caller($frame);

            $p{'message'} =~ s/(?:\r*\n)+$//;
            return "[". gmtime(time) ."] [". $p{'level'} ."]: "
                . $p{'message'} ." ($filename:$line)\n";
        };

        my $syslog_cb = sub {
            # if this code throw any warning we can get segfault
            no warnings;
            my %p = @_;

            my $frame = 0; # stack frame index
            # skip Log::* stack frames
            $frame++ while caller($frame) && caller($frame) =~ /^Log::/;
            my ($package, $filename, $line) = caller($frame);

            # syswrite() cannot take utf8; turn it off here.
            Encode::_utf8_off($p{message});

            $p{message} =~ s/(?:\r*\n)+$//;
            if ($p{level} eq 'debug') {
                return "$p{message}\n";
            } else {
                return "$p{message} ($filename:$line)\n";
            }
        };

        my $stack_cb = sub {
            no warnings;
            my %p = @_;
            return $p{'message'} unless $level_to_num{ $p{'level'} } >= $stack_from_level;

            require Devel::StackTrace;
            my $trace = Devel::StackTrace->new( ignore_class => [ 'Log::Dispatch', 'Log::Dispatch::Base' ] );
            return $p{'message'} . $trace->as_string;

            # skip calling of the Log::* subroutins
            my $frame = 0;
            $frame++ while caller($frame) && caller($frame) =~ /^Log::/;
            $frame++ while caller($frame) && (caller($frame))[3] =~ /^Log::/;

            $p{'message'} .= "\nStack trace:\n";
            while( my ($package, $filename, $line, $sub) = caller($frame++) ) {
                $p{'message'} .= "\t$sub(...) called at $filename:$line\n";
            }
            return $p{'message'};
        };

        if ( $Config->Get('LogToFile') ) {
            my ($filename, $logdir) = (
                $Config->Get('LogToFileNamed') || 'rt.log',
                $Config->Get('LogDir') || File::Spec->catdir( $VarPath, 'log' ),
            );
            if ( $filename =~ m![/\\]! ) { # looks like an absolute path.
                ($logdir) = $filename =~ m{^(.*[/\\])};
            }
            else {
                $filename = File::Spec->catfile( $logdir, $filename );
            }

            unless ( -d $logdir && ( ( -f $filename && -w $filename ) || -w $logdir ) ) {
                # localizing here would be hard when we don't have a current user yet
                die "Log file '$filename' couldn't be written or created.\n RT can't run.";
            }

            require Log::Dispatch::File;
            $RT::Logger->add( Log::Dispatch::File->new
                           ( name=>'file',
                             min_level=> $Config->Get('LogToFile'),
                             filename=> $filename,
                             mode=>'append',
                             callbacks => [ $simple_cb, $stack_cb ],
                           ));
        }
        if ( $Config->Get('LogToScreen') ) {
            require Log::Dispatch::Screen;
            $RT::Logger->add( Log::Dispatch::Screen->new
                         ( name => 'screen',
                           min_level => $Config->Get('LogToScreen'),
                           callbacks => [ $simple_cb, $stack_cb ],
                           stderr => 1,
                         ));
        }
        if ( $Config->Get('LogToSyslog') ) {
            require Log::Dispatch::Syslog;
            $RT::Logger->add(Log::Dispatch::Syslog->new
                         ( name => 'syslog',
                           ident => 'RT',
                           min_level => $Config->Get('LogToSyslog'),
                           callbacks => [ $syslog_cb, $stack_cb ],
                           stderr => 1,
                           $Config->Get('LogToSyslogConf'),
                         ));
        }
    }
    InitSignalHandlers();
}

{   # Work around bug in Log::Dispatch < 2.30, wherein the short forms
    # of ->warn, ->err, and ->crit do not usefully propagate out, unlike
    # ->warning, ->error, and ->critical
    package Log::Dispatch;
    no warnings 'redefine';
    sub warn { shift->warning(@_) }
    sub err  { shift->error(@_) }
    sub crit { shift->critical(@_) }
}

sub InitSignalHandlers {

# Signal handlers
## This is the default handling of warnings and die'ings in the code
## (including other used modules - maybe except for errors catched by
## Mason).  It will log all problems through the standard logging
## mechanism (see above).

    $SIG{__WARN__} = sub {
        # The 'wide character' warnings has to be silenced for now, at least
        # until HTML::Mason offers a sane way to process both raw output and
        # unicode strings.
        # use 'goto &foo' syntax to hide ANON sub from stack
        if( index($_[0], 'Wide character in ') != 0 ) {
            unshift @_, $RT::Logger, qw(level warning message);
            goto &Log::Dispatch::log;
        }
        # Return value is used only by RT::Test to filter warnings from
        # reaching the Test::NoWarnings catcher.  If Log::Dispatch::log() ever
        # starts returning 'IGNORE', we'll need to switch to something more
        # clever.  I don't expect that to happen.
        return 'IGNORE';
    };

#When we call die, trap it and log->crit with the value of the die.

    $SIG{__DIE__}  = sub {
        # if we are not in eval and perl is not parsing code
        # then rollback transactions and log RT error
        unless ($^S || !defined $^S ) {
            $RT::Handle->Rollback(1) if $RT::Handle;
            $RT::Logger->crit("$_[0]") if $RT::Logger;
        }
        die $_[0];
    };
}


sub CheckPerlRequirements {
    if ($^V < 5.008003) {
        die sprintf "RT requires Perl v5.8.3 or newer.  Your current Perl is v%vd\n", $^V;
    }

    # use $error here so the following "die" can still affect the global $@
    my $error;
    {
        local $@;
        eval {
            my $x = '';
            my $y = \$x;
            require Scalar::Util;
            Scalar::Util::weaken($y);
        };
        $error = $@;
    }

    if ($error) {
        die <<"EOF";

RT requires the Scalar::Util module be built with support for  the 'weaken'
function.

It is sometimes the case that operating system upgrades will replace
a working Scalar::Util with a non-working one. If your system was working
correctly up until now, this is likely the cause of the problem.

Please reinstall Scalar::Util, being careful to let it build with your C
compiler. Usually this is as simple as running the following command as
root.

    perl -MCPAN -e'install Scalar::Util'

EOF

    }
}

=head2 InitClasses

Load all modules that define base classes.

=cut

sub InitClasses {
    shift if @_%2; # so we can call it as a function or method
    my %args = (@_);
    require RT::Tickets;
    require RT::Transactions;
    require RT::Attachments;
    require RT::Users;
    require RT::Principals;
    require RT::CurrentUser;
    require RT::Templates;
    require RT::Queues;
    require RT::ScripActions;
    require RT::ScripConditions;
    require RT::Scrips;
    require RT::Groups;
    require RT::GroupMembers;
    require RT::CustomFields;
    require RT::CustomFieldValues;
    require RT::ObjectCustomFields;
    require RT::ObjectCustomFieldValues;
    require RT::Attributes;
    require RT::Dashboard;
    require RT::Approval;
    require RT::Lifecycle;
    require RT::Link;
    require RT::Links;
    require RT::Article;
    require RT::Articles;
    require RT::Class;
    require RT::Classes;
    require RT::ObjectClass;
    require RT::ObjectClasses;
    require RT::ObjectTopic;
    require RT::ObjectTopics;
    require RT::Topic;
    require RT::Topics;

    # on a cold server (just after restart) people could have an object
    # in the session, as we deserialize it so we never call constructor
    # of the class, so the list of accessible fields is empty and we die
    # with "Method xxx is not implemented in RT::SomeClass"

    # without this, we also can never call _ClassAccessible, because we
    # won't have filled RT::Record::_TABLE_ATTR
    $_->_BuildTableAttributes foreach qw(
        RT::Ticket
        RT::Transaction
        RT::Attachment
        RT::User
        RT::Principal
        RT::Template
        RT::Queue
        RT::ScripAction
        RT::ScripCondition
        RT::Scrip
        RT::Group
        RT::GroupMember
        RT::CustomField
        RT::CustomFieldValue
        RT::ObjectCustomField
        RT::ObjectCustomFieldValue
        RT::Attribute
        RT::ACE
        RT::Link
        RT::Article
        RT::Class
        RT::ObjectClass
        RT::ObjectTopic
        RT::Topic
    );

    if ( $args{'Heavy'} ) {
        # load scrips' modules
        my $scrips = RT::Scrips->new(RT->SystemUser);
        $scrips->Limit( FIELD => 'Stage', OPERATOR => '!=', VALUE => 'Disabled' );
        while ( my $scrip = $scrips->Next ) {
            local $@;
            eval { $scrip->LoadModules } or
                $RT::Logger->error("Invalid Scrip ".$scrip->Id.".  Unable to load the Action or Condition.  ".
                                   "You should delete or repair this Scrip in the admin UI.\n$@\n");
        }

	foreach my $class ( grep $_, RT->Config->Get('CustomFieldValuesSources') ) {
            local $@;
            eval "require $class; 1" or $RT::Logger->error(
                "Class '$class' is listed in CustomFieldValuesSources option"
                ." in the config, but we failed to load it:\n$@\n"
            );
        }

    }
}

=head2 InitSystemObjects

Initializes system objects: C<$RT::System>, C<< RT->SystemUser >>
and C<< RT->Nobody >>.

=cut

sub InitSystemObjects {

    #RT's system user is a genuine database user. its id lives here
    require RT::CurrentUser;
    $SystemUser = RT::CurrentUser->new;
    $SystemUser->LoadByName('RT_System');

    #RT's "nobody user" is a genuine database user. its ID lives here.
    $Nobody = RT::CurrentUser->new;
    $Nobody->LoadByName('Nobody');

    require RT::System;
    $System = RT::System->new( $SystemUser );
}

=head1 CLASS METHODS

=head2 Config

Returns the current L<config object|RT::Config>, but note that
you must L<load config|/LoadConfig> first otherwise this method
returns undef.

Method can be called as class method.

=cut

sub Config { return $Config || shift->LoadConfig(); }

=head2 DatabaseHandle

Returns the current L<database handle object|RT::Handle>.

See also L</ConnectToDatabase>.

=cut

sub DatabaseHandle { return $Handle }

=head2 Logger

Returns the logger. See also L</InitLogging>.

=cut

sub Logger { return $Logger }

=head2 System

Returns the current L<system object|RT::System>. See also
L</InitSystemObjects>.

=cut

sub System { return $System }

=head2 SystemUser

Returns the system user's object, it's object of
L<RT::CurrentUser> class that represents the system. See also
L</InitSystemObjects>.

=cut

sub SystemUser { return $SystemUser }

=head2 Nobody

Returns object of Nobody. It's object of L<RT::CurrentUser> class
that represents a user who can own ticket and nothing else. See
also L</InitSystemObjects>.

=cut

sub Nobody { return $Nobody }

sub PrivilegedUsers {
    if (!$_Privileged) {
    $_Privileged = RT::Group->new(RT->SystemUser);
    $_Privileged->LoadSystemInternalGroup('Privileged');
    }
    return $_Privileged;
}

sub UnprivilegedUsers {
    if (!$_Unprivileged) {
    $_Unprivileged = RT::Group->new(RT->SystemUser);
    $_Unprivileged->LoadSystemInternalGroup('Unprivileged');
    }
    return $_Unprivileged;
}


=head2 Plugins

Returns a listref of all Plugins currently configured for this RT instance.
You can define plugins by adding them to the @Plugins list in your RT_SiteConfig

=cut

our @PLUGINS = ();
sub Plugins {
    my $self = shift;
    unless (@PLUGINS) {
        $self->InitPluginPaths;
        @PLUGINS = $self->InitPlugins;
    }
    return \@PLUGINS;
}

=head2 PluginDirs

Takes an optional subdir (e.g. po, lib, etc.) and returns a list of
directories from plugins where that subdirectory exists.

This code does not check plugin names, plugin validitity, or load
plugins (see L</InitPlugins>) in any way, and requires that RT's
configuration have been already loaded.

=cut

sub PluginDirs {
    my $self = shift;
    my $subdir = shift;

    require RT::Plugin;

    my @res;
    foreach my $plugin (grep $_, RT->Config->Get('Plugins')) {
        my $path = RT::Plugin->new( name => $plugin )->Path( $subdir );
        next unless -d $path;
        push @res, $path;
    }
    return @res;
}

=head2 InitPluginPaths

Push plugins' lib paths into @INC right after F<local/lib>.
In case F<local/lib> isn't in @INC, append them to @INC

=cut

sub InitPluginPaths {
    my $self = shift || __PACKAGE__;

    my @lib_dirs = $self->PluginDirs('lib');

    my @tmp_inc;
    my $added;
    for (@INC) {
        if ( Cwd::realpath($_) eq $RT::LocalLibPath) {
            push @tmp_inc, $_, @lib_dirs;
            $added = 1;
        } else {
            push @tmp_inc, $_;
        }
    }

    # append @lib_dirs in case $RT::LocalLibPath isn't in @INC
    push @tmp_inc, @lib_dirs unless $added;

    my %seen;
    @INC = grep !$seen{$_}++, @tmp_inc;
}

=head2 InitPlugins

Initialize all Plugins found in the RT configuration file, setting up
their lib and L<HTML::Mason> component roots.

=cut

sub InitPlugins {
    my $self    = shift;
    my @plugins;
    require RT::Plugin;
    foreach my $plugin (grep $_, RT->Config->Get('Plugins')) {
        $plugin->require;
        die $UNIVERSAL::require::ERROR if ($UNIVERSAL::require::ERROR);
        push @plugins, RT::Plugin->new(name =>$plugin);
    }
    return @plugins;
}


sub InstallMode {
    my $self = shift;
    if (@_) {
        my ($integrity, $state, $msg) = RT::Handle->CheckIntegrity;
        if ($_[0] and $integrity) {
            # Trying to turn install mode on but we have a good DB!
            require Carp;
            $RT::Logger->error(
                Carp::longmess("Something tried to turn on InstallMode but we have DB integrity!")
            );
        }
        else {
            $_INSTALL_MODE = shift;
            if($_INSTALL_MODE) {
                require RT::CurrentUser;
               $SystemUser = RT::CurrentUser->new();
            }
        }
    }
    return $_INSTALL_MODE;
}

sub LoadGeneratedData {
    my $class = shift;
    my $pm_path = ( File::Spec->splitpath( $INC{'RT.pm'} ) )[1];

    require "$pm_path/RT/Generated.pm" || die "Couldn't load RT::Generated: $@";
    $class->CanonicalizeGeneratedPaths();
}

sub CanonicalizeGeneratedPaths {
    my $class = shift;
    unless ( File::Spec->file_name_is_absolute($EtcPath) ) {

   # if BasePath exists and is absolute, we won't infer it from $INC{'RT.pm'}.
   # otherwise RT.pm will make the source dir(where we configure RT) be the
   # BasePath instead of the one specified by --prefix
        unless ( -d $BasePath
                 && File::Spec->file_name_is_absolute($BasePath) )
        {
            my $pm_path = ( File::Spec->splitpath( $INC{'RT.pm'} ) )[1];

     # need rel2abs here is to make sure path is absolute, since $INC{'RT.pm'}
     # is not always absolute
            $BasePath = File::Spec->rel2abs(
                          File::Spec->catdir( $pm_path, File::Spec->updir ) );
        }

        $BasePath = Cwd::realpath($BasePath);

        for my $path (
                    qw/EtcPath BinPath SbinPath VarPath LocalPath LocalEtcPath
                    LocalLibPath LexiconPath LocalLexiconPath PluginPath
                    LocalPluginPath MasonComponentRoot MasonLocalComponentRoot
                    MasonDataDir MasonSessionDir/
                     )
        {
            no strict 'refs';

            # just change relative ones
            $$path = File::Spec->catfile( $BasePath, $$path )
                unless File::Spec->file_name_is_absolute($$path);
        }
    }

}

=head2 AddJavaScript

helper method to add js files to C<JSFiles> config.
to add extra js files, you can add the following line
in the plugin's main file:

    RT->AddJavaScript( 'foo.js', 'bar.js' ); 

=cut

sub AddJavaScript {
    my $self = shift;

    my @old = RT->Config->Get('JSFiles');
    RT->Config->Set( 'JSFiles', @old, @_ );
    return RT->Config->Get('JSFiles');
}

=head2 AddStyleSheets

helper method to add css files to C<CSSFiles> config

to add extra css files, you can add the following line
in the plugin's main file:

    RT->AddStyleSheets( 'foo.css', 'bar.css' ); 

=cut

sub AddStyleSheets {
    my $self = shift;
    my @old = RT->Config->Get('CSSFiles');
    RT->Config->Set( 'CSSFiles', @old, @_ );
    return RT->Config->Get('CSSFiles');
}

=head2 JavaScript

helper method of RT->Config->Get('JSFiles')

=cut

sub JavaScript {
    return RT->Config->Get('JSFiles');
}

=head2 StyleSheets

helper method of RT->Config->Get('CSSFiles')

=cut

sub StyleSheets {
    return RT->Config->Get('CSSFiles');
}

=head1 BUGS

Please report them to rt-bugs@bestpractical.com, if you know what's
broken and have at least some idea of what needs to be fixed.

If you're not sure what's going on, report them rt-devel@lists.bestpractical.com.

=head1 SEE ALSO

L<RT::StyleGuide>
L<DBIx::SearchBuilder>

=cut

require RT::Base;
RT::Base->_ImportOverlays();

1;