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## Portions Copyright 2000 Tobias Brox <tobix@fsck.com>

## This is a library of static subs to be used by the Mason web
## interface to RT

=head1 NAME

RT::Interface::Web


=cut

use strict;
use warnings;

package RT::Interface::Web;

use RT::SavedSearches;
use URI qw();
use RT::Interface::Web::Menu;
use RT::Interface::Web::Session;
use Digest::MD5 ();
use Encode qw();
use List::MoreUtils qw();
use JSON qw();

=head2 SquishedCSS $style

=cut

my %SQUISHED_CSS;
sub SquishedCSS {
    my $style = shift or die "need name";
    return $SQUISHED_CSS{$style} if $SQUISHED_CSS{$style};
    require RT::Squish::CSS;
    my $css = RT::Squish::CSS->new( Style => $style );
    $SQUISHED_CSS{ $css->Style } = $css;
    return $css;
}

=head2 SquishedJS

=cut

my $SQUISHED_JS;
sub SquishedJS {
    return $SQUISHED_JS if $SQUISHED_JS;

    require RT::Squish::JS;
    my $js = RT::Squish::JS->new();
    $SQUISHED_JS = $js;
    return $js;
}

=head2 ClearSquished

Removes the cached CSS and JS entries, forcing them to be regenerated
on next use.

=cut

sub ClearSquished {
    undef $SQUISHED_JS;
    %SQUISHED_CSS = ();
}

=head2 EscapeUTF8 SCALARREF

does a css-busting but minimalist escaping of whatever html you're passing in.

=cut

sub EscapeUTF8 {
    my $ref = shift;
    return unless defined $$ref;

    $$ref =~ s/&/&#38;/g;
    $$ref =~ s/</&lt;/g;
    $$ref =~ s/>/&gt;/g;
    $$ref =~ s/\(/&#40;/g;
    $$ref =~ s/\)/&#41;/g;
    $$ref =~ s/"/&#34;/g;
    $$ref =~ s/'/&#39;/g;
}



=head2 EscapeURI SCALARREF

Escapes URI component according to RFC2396

=cut

sub EscapeURI {
    my $ref = shift;
    return unless defined $$ref;

    use bytes;
    $$ref =~ s/([^a-zA-Z0-9_.!~*'()-])/uc sprintf("%%%02X", ord($1))/eg;
}

=head2 EncodeJSON SCALAR

Encodes the SCALAR to JSON and returns a JSON string.  SCALAR may be a simple
value or a reference.

=cut

sub EncodeJSON {
    JSON::to_json(shift, { utf8 => 1, allow_nonref => 1 });
}

sub _encode_surrogates {
    my $uni = $_[0] - 0x10000;
    return ($uni /  0x400 + 0xD800, $uni % 0x400 + 0xDC00);
}

sub EscapeJS {
    my $ref = shift;
    return unless defined $$ref;

    $$ref = "'" . join('',
                 map {
                     chr($_) =~ /[a-zA-Z0-9]/ ? chr($_) :
                     $_  <= 255   ? sprintf("\\x%02X", $_) :
                     $_  <= 65535 ? sprintf("\\u%04X", $_) :
                     sprintf("\\u%X\\u%X", _encode_surrogates($_))
                 } unpack('U*', $$ref))
        . "'";
}

=head2 WebCanonicalizeInfo();

Different web servers set different environmental varibles. This
function must return something suitable for REMOTE_USER. By default,
just downcase $ENV{'REMOTE_USER'}

=cut

sub WebCanonicalizeInfo {
    return $ENV{'REMOTE_USER'} ? lc $ENV{'REMOTE_USER'} : $ENV{'REMOTE_USER'};
}



=head2 WebExternalAutoInfo($user);

Returns a hash of user attributes, used when WebExternalAuto is set.

=cut

sub WebExternalAutoInfo {
    my $user = shift;

    my %user_info;

    # default to making Privileged users, even if they specify
    # some other default Attributes
    if ( !$RT::AutoCreate
        || ( ref($RT::AutoCreate) && not exists $RT::AutoCreate->{Privileged} ) )
    {
        $user_info{'Privileged'} = 1;
    }

    if ( $^O !~ /^(?:riscos|MacOS|MSWin32|dos|os2)$/ ) {

        # Populate fields with information from Unix /etc/passwd

        my ( $comments, $realname ) = ( getpwnam($user) )[ 5, 6 ];
        $user_info{'Comments'} = $comments if defined $comments;
        $user_info{'RealName'} = $realname if defined $realname;
    } elsif ( $^O eq 'MSWin32' and eval 'use Net::AdminMisc; 1' ) {

        # Populate fields with information from NT domain controller
    }

    # and return the wad of stuff
    return {%user_info};
}


sub HandleRequest {
    my $ARGS = shift;

    if (RT->Config->Get('DevelMode')) {
        require Module::Refresh;
        Module::Refresh->refresh;
    }

    $HTML::Mason::Commands::r->content_type("text/html; charset=utf-8");

    $HTML::Mason::Commands::m->{'rt_base_time'} = [ Time::HiRes::gettimeofday() ];

    # Roll back any dangling transactions from a previous failed connection
    $RT::Handle->ForceRollback() if $RT::Handle and $RT::Handle->TransactionDepth;

    MaybeEnableSQLStatementLog();

    # avoid reentrancy, as suggested by masonbook
    local *HTML::Mason::Commands::session unless $HTML::Mason::Commands::m->is_subrequest;

    $HTML::Mason::Commands::m->autoflush( $HTML::Mason::Commands::m->request_comp->attr('AutoFlush') )
        if ( $HTML::Mason::Commands::m->request_comp->attr_exists('AutoFlush') );

    ValidateWebConfig();

    DecodeARGS($ARGS);
    local $HTML::Mason::Commands::DECODED_ARGS = $ARGS;
    PreprocessTimeUpdates($ARGS);

    InitializeMenu();
    MaybeShowInstallModePage();

    $HTML::Mason::Commands::m->comp( '/Elements/SetupSessionCookie', %$ARGS );
    SendSessionCookie();

    if ( _UserLoggedIn() ) {
        # make user info up to date
        $HTML::Mason::Commands::session{'CurrentUser'}
          ->Load( $HTML::Mason::Commands::session{'CurrentUser'}->id );
    }
    else {
        $HTML::Mason::Commands::session{'CurrentUser'} = RT::CurrentUser->new();
    }

    # Process session-related callbacks before any auth attempts
    $HTML::Mason::Commands::m->callback( %$ARGS, CallbackName => 'Session', CallbackPage => '/autohandler' );

    MaybeRejectPrivateComponentRequest();

    MaybeShowNoAuthPage($ARGS);

    AttemptExternalAuth($ARGS) if RT->Config->Get('WebExternalAuthContinuous') or not _UserLoggedIn();

    _ForceLogout() unless _UserLoggedIn();

    # Process per-page authentication callbacks
    $HTML::Mason::Commands::m->callback( %$ARGS, CallbackName => 'Auth', CallbackPage => '/autohandler' );

    unless ( _UserLoggedIn() ) {
        _ForceLogout();

        # Authenticate if the user is trying to login via user/pass query args
        my ($authed, $msg) = AttemptPasswordAuthentication($ARGS);

        unless ($authed) {
            my $m = $HTML::Mason::Commands::m;

            # REST urls get a special 401 response
            if ($m->request_comp->path =~ m{^/REST/\d+\.\d+/}) {
                $HTML::Mason::Commands::r->content_type("text/plain");
                $m->error_format("text");
                $m->out("RT/$RT::VERSION 401 Credentials required\n");
                $m->out("\n$msg\n") if $msg;
                $m->abort;
            }
            # Specially handle /index.html so that we get a nicer URL
            elsif ( $m->request_comp->path eq '/index.html' ) {
                my $next = SetNextPage($ARGS);
                $m->comp('/NoAuth/Login.html', next => $next, actions => [$msg]);
                $m->abort;
            }
            else {
                TangentForLogin($ARGS, results => ($msg ? LoginError($msg) : undef));
            }
        }
    }

    MaybeShowInterstitialCSRFPage($ARGS);

    # now it applies not only to home page, but any dashboard that can be used as a workspace
    $HTML::Mason::Commands::session{'home_refresh_interval'} = $ARGS->{'HomeRefreshInterval'}
        if ( $ARGS->{'HomeRefreshInterval'} );

    # Process per-page global callbacks
    $HTML::Mason::Commands::m->callback( %$ARGS, CallbackName => 'Default', CallbackPage => '/autohandler' );

    ShowRequestedPage($ARGS);
    LogRecordedSQLStatements(RequestData => {
        Path => $HTML::Mason::Commands::m->request_comp->path,
    });

    # Process per-page final cleanup callbacks
    $HTML::Mason::Commands::m->callback( %$ARGS, CallbackName => 'Final', CallbackPage => '/autohandler' );

    $HTML::Mason::Commands::m->comp( '/Elements/Footer', %$ARGS );
}

sub _ForceLogout {

    delete $HTML::Mason::Commands::session{'CurrentUser'};
}

sub _UserLoggedIn {
    if ( $HTML::Mason::Commands::session{CurrentUser} && $HTML::Mason::Commands::session{'CurrentUser'}->id ) {
        return 1;
    } else {
        return undef;
    }

}

=head2 LoginError ERROR

Pushes a login error into the Actions session store and returns the hash key.

=cut

sub LoginError {
    my $new = shift;
    my $key = Digest::MD5::md5_hex( rand(1024) );
    push @{ $HTML::Mason::Commands::session{"Actions"}->{$key} ||= [] }, $new;
    $HTML::Mason::Commands::session{'i'}++;
    return $key;
}

=head2 SetNextPage ARGSRef [PATH]

Intuits and stashes the next page in the sesssion hash.  If PATH is
specified, uses that instead of the value of L<IntuitNextPage()>.  Returns
the hash value.

=cut

sub SetNextPage {
    my $ARGS = shift;
    my $next = $_[0] ? $_[0] : IntuitNextPage();
    my $hash = Digest::MD5::md5_hex($next . $$ . rand(1024));
    my $page = { url => $next };

    # If an explicit URL was passed and we didn't IntuitNextPage, then
    # IsPossibleCSRF below is almost certainly unrelated to the actual
    # destination.  Currently explicit next pages aren't used in RT, but the
    # API is available.
    if (not $_[0] and RT->Config->Get("RestrictReferrer")) {
        # This isn't really CSRF, but the CSRF heuristics are useful for catching
        # requests which may have unintended side-effects.
        my ($is_csrf, $msg, @loc) = IsPossibleCSRF($ARGS);
        if ($is_csrf) {
            RT->Logger->notice(
                "Marking original destination as having side-effects before redirecting for login.\n"
               ."Request: $next\n"
               ."Reason: " . HTML::Mason::Commands::loc($msg, @loc)
            );
            $page->{'HasSideEffects'} = [$msg, @loc];
        }
    }

    $HTML::Mason::Commands::session{'NextPage'}->{$hash} = $page;
    $HTML::Mason::Commands::session{'i'}++;
    return $hash;
}

=head2 FetchNextPage HASHKEY

Returns the stashed next page hashref for the given hash.

=cut

sub FetchNextPage {
    my $hash = shift || "";
    return $HTML::Mason::Commands::session{'NextPage'}->{$hash};
}

=head2 RemoveNextPage HASHKEY

Removes the stashed next page for the given hash and returns it.

=cut

sub RemoveNextPage {
    my $hash = shift || "";
    return delete $HTML::Mason::Commands::session{'NextPage'}->{$hash};
}

=head2 TangentForLogin ARGSRef [HASH]

Redirects to C</NoAuth/Login.html>, setting the value of L<IntuitNextPage> as
the next page.  Takes a hashref of request %ARGS as the first parameter.
Optionally takes all other parameters as a hash which is dumped into query
params.

=cut

sub TangentForLogin {
    my $ARGS  = shift;
    my $hash  = SetNextPage($ARGS);
    my %query = (@_, next => $hash);
    my $login = RT->Config->Get('WebURL') . 'NoAuth/Login.html?';
    $login .= $HTML::Mason::Commands::m->comp('/Elements/QueryString', %query);
    Redirect($login);
}

=head2 TangentForLoginWithError ERROR

Localizes the passed error message, stashes it with L<LoginError> and then
calls L<TangentForLogin> with the appropriate results key.

=cut

sub TangentForLoginWithError {
    my $ARGS = shift;
    my $key  = LoginError(HTML::Mason::Commands::loc(@_));
    TangentForLogin( $ARGS, results => $key );
}

=head2 IntuitNextPage

Attempt to figure out the path to which we should return the user after a
tangent.  The current request URL is used, or failing that, the C<WebURL>
configuration variable.

=cut

sub IntuitNextPage {
    my $req_uri;

    # This includes any query parameters.  Redirect will take care of making
    # it an absolute URL.
    if ($ENV{'REQUEST_URI'}) {
        $req_uri = $ENV{'REQUEST_URI'};

        # collapse multiple leading slashes so the first part doesn't look like
        # a hostname of a schema-less URI
        $req_uri =~ s{^/+}{/};
    }

    my $next = defined $req_uri ? $req_uri : RT->Config->Get('WebURL');

    # sanitize $next
    my $uri = URI->new($next);

    # You get undef scheme with a relative uri like "/Search/Build.html"
    unless (!defined($uri->scheme) || $uri->scheme eq 'http' || $uri->scheme eq 'https') {
        $next = RT->Config->Get('WebURL');
    }

    # Make sure we're logging in to the same domain
    # You can get an undef authority with a relative uri like "index.html"
    my $uri_base_url = URI->new(RT->Config->Get('WebBaseURL'));
    unless (!defined($uri->authority) || $uri->authority eq $uri_base_url->authority) {
        $next = RT->Config->Get('WebURL');
    }

    return $next;
}

=head2 MaybeShowInstallModePage 

This function, called exclusively by RT's autohandler, dispatches
a request to RT's Installation workflow, only if Install Mode is enabled in the configuration file.

If it serves a page, it stops mason processing. Otherwise, mason just keeps running through the autohandler

=cut 

sub MaybeShowInstallModePage {
    return unless RT->InstallMode;

    my $m = $HTML::Mason::Commands::m;
    if ( $m->base_comp->path =~ RT->Config->Get('WebNoAuthRegex') ) {
        $m->call_next();
    } elsif ( $m->request_comp->path !~ m{^(/+)Install/} ) {
        RT::Interface::Web::Redirect( RT->Config->Get('WebURL') . "Install/index.html" );
    } else {
        $m->call_next();
    }
    $m->abort();
}

=head2 MaybeShowNoAuthPage  \%ARGS

This function, called exclusively by RT's autohandler, dispatches
a request to the page a user requested (but only if it matches the "noauth" regex.

If it serves a page, it stops mason processing. Otherwise, mason just keeps running through the autohandler

=cut 

sub MaybeShowNoAuthPage {
    my $ARGS = shift;

    my $m = $HTML::Mason::Commands::m;

    return unless $m->base_comp->path =~ RT->Config->Get('WebNoAuthRegex');

    # Don't show the login page to logged in users
    Redirect(RT->Config->Get('WebURL'))
        if $m->base_comp->path eq '/NoAuth/Login.html' and _UserLoggedIn();

    # If it's a noauth file, don't ask for auth.
    $m->comp( { base_comp => $m->request_comp }, $m->fetch_next, %$ARGS );
    $m->abort;
}

=head2 MaybeRejectPrivateComponentRequest

This function will reject calls to private components, like those under
C</Elements>. If the requested path is a private component then we will
abort with a C<403> error.

=cut

sub MaybeRejectPrivateComponentRequest {
    my $m = $HTML::Mason::Commands::m;
    my $path = $m->request_comp->path;

    # We do not check for dhandler here, because requesting our dhandlers
    # directly is okay. Mason will invoke the dhandler with a dhandler_arg of
    # 'dhandler'.

    if ($path =~ m{
            / # leading slash
            ( Elements    |
              _elements   | # mobile UI
              Callbacks   |
              Widgets     |
              autohandler | # requesting this directly is suspicious
              l (_unsafe)? ) # loc component
            ( $ | / ) # trailing slash or end of path
        }xi) {
            $m->abort(403);
    }

    return;
}

sub InitializeMenu {
    $HTML::Mason::Commands::m->notes('menu', RT::Interface::Web::Menu->new());
    $HTML::Mason::Commands::m->notes('page-menu', RT::Interface::Web::Menu->new());
    $HTML::Mason::Commands::m->notes('page-widgets', RT::Interface::Web::Menu->new());

}


=head2 ShowRequestedPage  \%ARGS

This function, called exclusively by RT's autohandler, dispatches
a request to the page a user requested (making sure that unpriviled users
can only see self-service pages.

=cut 

sub ShowRequestedPage {
    my $ARGS = shift;

    my $m = $HTML::Mason::Commands::m;

    # Ensure that the cookie that we send is up-to-date, in case the
    # session-id has been modified in any way
    SendSessionCookie();

    # precache all system level rights for the current user
    $HTML::Mason::Commands::session{CurrentUser}->PrincipalObj->HasRights( Object => RT->System );

    # If the user isn't privileged, they can only see SelfService
    unless ( $HTML::Mason::Commands::session{'CurrentUser'}->Privileged ) {

        # if the user is trying to access a ticket, redirect them
        if ( $m->request_comp->path =~ m{^(/+)Ticket/Display.html} && $ARGS->{'id'} ) {
            RT::Interface::Web::Redirect( RT->Config->Get('WebURL') . "SelfService/Display.html?id=" . $ARGS->{'id'} );
        }

        # otherwise, drop the user at the SelfService default page
        elsif ( $m->base_comp->path !~ RT->Config->Get('SelfServiceRegex') ) {
            RT::Interface::Web::Redirect( RT->Config->Get('WebURL') . "SelfService/" );
        }

        # if user is in SelfService dir let him do anything
        else {
            $m->comp( { base_comp => $m->request_comp }, $m->fetch_next, %$ARGS );
        }
    } else {
        $m->comp( { base_comp => $m->request_comp }, $m->fetch_next, %$ARGS );
    }

}

sub AttemptExternalAuth {
    my $ARGS = shift;

    return unless ( RT->Config->Get('WebExternalAuth') );

    my $user = $ARGS->{user};
    my $m    = $HTML::Mason::Commands::m;

    # If RT is configured for external auth, let's go through and get REMOTE_USER

    # do we actually have a REMOTE_USER equivlent?
    if ( RT::Interface::Web::WebCanonicalizeInfo() ) {
        my $orig_user = $user;

        $user = RT::Interface::Web::WebCanonicalizeInfo();
        my $load_method = RT->Config->Get('WebExternalGecos') ? 'LoadByGecos' : 'Load';

        if ( $^O eq 'MSWin32' and RT->Config->Get('WebExternalGecos') ) {
            my $NodeName = Win32::NodeName();
            $user =~ s/^\Q$NodeName\E\\//i;
        }

        my $next = RemoveNextPage($ARGS->{'next'});
           $next = $next->{'url'} if ref $next;
        InstantiateNewSession() unless _UserLoggedIn;
        $HTML::Mason::Commands::session{'CurrentUser'} = RT::CurrentUser->new();
        $HTML::Mason::Commands::session{'CurrentUser'}->$load_method($user);

        if ( RT->Config->Get('WebExternalAuto') and not _UserLoggedIn() ) {

            # Create users on-the-fly
            my $UserObj = RT::User->new(RT->SystemUser);
            my ( $val, $msg ) = $UserObj->Create(
                %{ ref RT->Config->Get('AutoCreate') ? RT->Config->Get('AutoCreate') : {} },
                Name  => $user,
                Gecos => $user,
            );

            if ($val) {

                # now get user specific information, to better create our user.
                my $new_user_info = RT::Interface::Web::WebExternalAutoInfo($user);

                # set the attributes that have been defined.
                foreach my $attribute ( $UserObj->WritableAttributes ) {
                    $m->callback(
                        Attribute    => $attribute,
                        User         => $user,
                        UserInfo     => $new_user_info,
                        CallbackName => 'NewUser',
                        CallbackPage => '/autohandler'
                    );
                    my $method = "Set$attribute";
                    $UserObj->$method( $new_user_info->{$attribute} ) if defined $new_user_info->{$attribute};
                }
                $HTML::Mason::Commands::session{'CurrentUser'}->Load($user);
            } else {

                # we failed to successfully create the user. abort abort abort.
                delete $HTML::Mason::Commands::session{'CurrentUser'};

                if (RT->Config->Get('WebFallbackToInternalAuth')) {
                    TangentForLoginWithError($ARGS, 'Cannot create user: [_1]', $msg);
                } else {
                    $m->abort();
                }
            }
        }

        if ( _UserLoggedIn() ) {
            $m->callback( %$ARGS, CallbackName => 'ExternalAuthSuccessfulLogin', CallbackPage => '/autohandler' );
            # It is possible that we did a redirect to the login page,
            # if the external auth allows lack of auth through with no
            # REMOTE_USER set, instead of forcing a "permission
            # denied" message.  Honor the $next.
            Redirect($next) if $next;
            # Unlike AttemptPasswordAuthentication below, we do not
            # force a redirect to / if $next is not set -- otherwise,
            # straight-up external auth would always redirect to /
            # when you first hit it.
        } else {
            delete $HTML::Mason::Commands::session{'CurrentUser'};
            $user = $orig_user;

            unless ( RT->Config->Get('WebFallbackToInternalAuth') ) {
                TangentForLoginWithError($ARGS, 'You are not an authorized user');
            }
        }
    } elsif ( RT->Config->Get('WebFallbackToInternalAuth') ) {
        unless ( defined $HTML::Mason::Commands::session{'CurrentUser'} ) {
            # XXX unreachable due to prior defaulting in HandleRequest (check c34d108)
            TangentForLoginWithError($ARGS, 'You are not an authorized user');
        }
    } else {

        # WebExternalAuth is set, but we don't have a REMOTE_USER. abort
        # XXX: we must return AUTH_REQUIRED status or we fallback to
        # internal auth here too.
        delete $HTML::Mason::Commands::session{'CurrentUser'}
            if defined $HTML::Mason::Commands::session{'CurrentUser'};
    }
}

sub AttemptPasswordAuthentication {
    my $ARGS = shift;
    return unless defined $ARGS->{user} && defined $ARGS->{pass};

    my $user_obj = RT::CurrentUser->new();
    $user_obj->Load( $ARGS->{user} );

    my $m = $HTML::Mason::Commands::m;

    unless ( $user_obj->id && $user_obj->IsPassword( $ARGS->{pass} ) ) {
        $RT::Logger->error("FAILED LOGIN for @{[$ARGS->{user}]} from $ENV{'REMOTE_ADDR'}");
        $m->callback( %$ARGS, CallbackName => 'FailedLogin', CallbackPage => '/autohandler' );
        return (0, HTML::Mason::Commands::loc('Your username or password is incorrect'));
    }
    else {
        $RT::Logger->info("Successful login for @{[$ARGS->{user}]} from $ENV{'REMOTE_ADDR'}");

        # It's important to nab the next page from the session before we blow
        # the session away
        my $next = RemoveNextPage($ARGS->{'next'});
           $next = $next->{'url'} if ref $next;

        InstantiateNewSession();
        $HTML::Mason::Commands::session{'CurrentUser'} = $user_obj;

        $m->callback( %$ARGS, CallbackName => 'SuccessfulLogin', CallbackPage => '/autohandler' );

        # Really the only time we don't want to redirect here is if we were
        # passed user and pass as query params in the URL.
        if ($next) {
            Redirect($next);
        }
        elsif ($ARGS->{'next'}) {
            # Invalid hash, but still wants to go somewhere, take them to /
            Redirect(RT->Config->Get('WebURL'));
        }

        return (1, HTML::Mason::Commands::loc('Logged in'));
    }
}

=head2 LoadSessionFromCookie

Load or setup a session cookie for the current user.

=cut

sub _SessionCookieName {
    my $cookiename = "RT_SID_" . RT->Config->Get('rtname');
    $cookiename .= "." . $ENV{'SERVER_PORT'} if $ENV{'SERVER_PORT'};
    return $cookiename;
}

sub LoadSessionFromCookie {

    my %cookies       = CGI::Cookie->fetch;
    my $cookiename    = _SessionCookieName();
    my $SessionCookie = ( $cookies{$cookiename} ? $cookies{$cookiename}->value : undef );
    tie %HTML::Mason::Commands::session, 'RT::Interface::Web::Session', $SessionCookie;
    unless ( $SessionCookie && $HTML::Mason::Commands::session{'_session_id'} eq $SessionCookie ) {
        InstantiateNewSession();
    }
    if ( int RT->Config->Get('AutoLogoff') ) {
        my $now = int( time / 60 );
        my $last_update = $HTML::Mason::Commands::session{'_session_last_update'} || 0;

        if ( $last_update && ( $now - $last_update - RT->Config->Get('AutoLogoff') ) > 0 ) {
            InstantiateNewSession();
        }

        # save session on each request when AutoLogoff is turned on
        $HTML::Mason::Commands::session{'_session_last_update'} = $now if $now != $last_update;
    }
}

sub InstantiateNewSession {
    tied(%HTML::Mason::Commands::session)->delete if tied(%HTML::Mason::Commands::session);
    tie %HTML::Mason::Commands::session, 'RT::Interface::Web::Session', undef;
    SendSessionCookie();
}

sub SendSessionCookie {
    my $cookie = CGI::Cookie->new(
        -name     => _SessionCookieName(),
        -value    => $HTML::Mason::Commands::session{_session_id},
        -path     => RT->Config->Get('WebPath'),
        -secure   => ( RT->Config->Get('WebSecureCookies') ? 1 : 0 ),
        -httponly => ( RT->Config->Get('WebHttpOnlyCookies') ? 1 : 0 ),
    );

    $HTML::Mason::Commands::r->err_headers_out->{'Set-Cookie'} = $cookie->as_string;
}

=head2 Redirect URL

This routine ells the current user's browser to redirect to URL.  
Additionally, it unties the user's currently active session, helping to avoid 
A bug in Apache::Session 1.81 and earlier which clobbers sessions if we try to use 
a cached DBI statement handle twice at the same time.

=cut

sub Redirect {
    my $redir_to = shift;
    untie $HTML::Mason::Commands::session;
    my $uri        = URI->new($redir_to);
    my $server_uri = URI->new( RT->Config->Get('WebURL') );
    
    # Make relative URIs absolute from the server host and scheme
    $uri->scheme($server_uri->scheme) if not defined $uri->scheme;
    if (not defined $uri->host) {
        $uri->host($server_uri->host);
        $uri->port($server_uri->port);
    }

    # If the user is coming in via a non-canonical
    # hostname, don't redirect them to the canonical host,
    # it will just upset them (and invalidate their credentials)
    # don't do this if $RT::CanonicalizeRedirectURLs is true
    if (   !RT->Config->Get('CanonicalizeRedirectURLs')
        && $uri->host eq $server_uri->host
        && $uri->port eq $server_uri->port )
    {
        if ( defined $ENV{HTTPS} and $ENV{'HTTPS'} eq 'on' ) {
            $uri->scheme('https');
        } else {
            $uri->scheme('http');
        }

        # [rt3.fsck.com #12716] Apache recommends use of $SERVER_HOST
        $uri->host( $ENV{'SERVER_HOST'} || $ENV{'HTTP_HOST'} || $ENV{'SERVER_NAME'});
        $uri->port( $ENV{'SERVER_PORT'} );
    }

    # not sure why, but on some systems without this call mason doesn't
    # set status to 302, but 200 instead and people see blank pages
    $HTML::Mason::Commands::r->status(302);

    # Perlbal expects a status message, but Mason's default redirect status
    # doesn't provide one. See also rt.cpan.org #36689.
    $HTML::Mason::Commands::m->redirect( $uri->canonical, "302 Found" );

    $HTML::Mason::Commands::m->abort;
}

=head2 StaticFileHeaders 

Send the browser a few headers to try to get it to (somewhat agressively)
cache RT's static Javascript and CSS files.

This routine could really use _accurate_ heuristics. (XXX TODO)

=cut

sub StaticFileHeaders {
    my $date = RT::Date->new(RT->SystemUser);

    # make cache public
    $HTML::Mason::Commands::r->headers_out->{'Cache-Control'} = 'max-age=259200, public';

    # remove any cookie headers -- if it is cached publicly, it
    # shouldn't include anyone's cookie!
    delete $HTML::Mason::Commands::r->err_headers_out->{'Set-Cookie'};

    # Expire things in a month.
    $date->Set( Value => time + 30 * 24 * 60 * 60 );
    $HTML::Mason::Commands::r->headers_out->{'Expires'} = $date->RFC2616;

    # if we set 'Last-Modified' then browser request a comp using 'If-Modified-Since'
    # request, but we don't handle it and generate full reply again
    # Last modified at server start time
    # $date->Set( Value => $^T );
    # $HTML::Mason::Commands::r->headers_out->{'Last-Modified'} = $date->RFC2616;
}

=head2 ComponentPathIsSafe PATH

Takes C<PATH> and returns a boolean indicating that the user-specified partial
component path is safe.

Currently "safe" means that the path does not start with a dot (C<.>), does
not contain a slash-dot C</.>, and does not contain any nulls.

=cut

sub ComponentPathIsSafe {
    my $self = shift;
    my $path = shift;
    return $path !~ m{(?:^|/)\.} and $path !~ m{\0};
}

=head2 PathIsSafe

Takes a C<< Path => path >> and returns a boolean indicating that
the path is safely within RT's control or not. The path I<must> be
relative.

This function does not consult the filesystem at all; it is merely
a logical sanity checking of the path. This explicitly does not handle
symlinks; if you have symlinks in RT's webroot pointing outside of it,
then we assume you know what you are doing.

=cut

sub PathIsSafe {
    my $self = shift;
    my %args = @_;
    my $path = $args{Path};

    # Get File::Spec to clean up extra /s, ./, etc
    my $cleaned_up = File::Spec->canonpath($path);

    if (!defined($cleaned_up)) {
        $RT::Logger->info("Rejecting path that canonpath doesn't understand: $path");
        return 0;
    }

    # Forbid too many ..s. We can't just sum then check because
    # "../foo/bar/baz" should be illegal even though it has more
    # downdirs than updirs. So as soon as we get a negative score
    # (which means "breaking out" of the top level) we reject the path.

    my @components = split '/', $cleaned_up;
    my $score = 0;
    for my $component (@components) {
        if ($component eq '..') {
            $score--;
            if ($score < 0) {
                $RT::Logger->info("Rejecting unsafe path: $path");
                return 0;
            }
        }
        elsif ($component eq '.' || $component eq '') {
            # these two have no effect on $score
        }
        else {
            $score++;
        }
    }

    return 1;
}

=head2 SendStaticFile 

Takes a File => path and a Type => Content-type

If Type isn't provided and File is an image, it will
figure out a sane Content-type, otherwise it will
send application/octet-stream

Will set caching headers using StaticFileHeaders

=cut

sub SendStaticFile {
    my $self = shift;
    my %args = @_;
    my $file = $args{File};
    my $type = $args{Type};
    my $relfile = $args{RelativeFile};

    if (defined($relfile) && !$self->PathIsSafe(Path => $relfile)) {
        $HTML::Mason::Commands::r->status(400);
        $HTML::Mason::Commands::m->abort;
    }

    $self->StaticFileHeaders();

    unless ($type) {
        if ( $file =~ /\.(gif|png|jpe?g)$/i ) {
            $type = "image/$1";
            $type =~ s/jpg/jpeg/gi;
        }
        $type ||= "application/octet-stream";
    }
    $HTML::Mason::Commands::r->content_type($type);
    open( my $fh, '<', $file ) or die "couldn't open file: $!";
    binmode($fh);
    {
        local $/ = \16384;
        $HTML::Mason::Commands::m->out($_) while (<$fh>);
        $HTML::Mason::Commands::m->flush_buffer;
    }
    close $fh;
}



sub MobileClient {
    my $self = shift;


if (($ENV{'HTTP_USER_AGENT'} || '') =~ /(?:hiptop|Blazer|Novarra|Vagabond|SonyEricsson|Symbian|NetFront|UP.Browser|UP.Link|Windows CE|MIDP|J2ME|DoCoMo|J-PHONE|PalmOS|PalmSource|iPhone|iPod|AvantGo|Nokia|Android|WebOS|S60|Mobile)/io && !$HTML::Mason::Commands::session{'NotMobile'})  {
    return 1;
} else {
    return undef;
}

}


sub StripContent {
    my %args    = @_;
    my $content = $args{Content};
    return '' unless $content;

    # Make the content have no 'weird' newlines in it
    $content =~ s/\r+\n/\n/g;

    my $return_content = $content;

    my $html = $args{ContentType} && $args{ContentType} eq "text/html";
    my $sigonly = $args{StripSignature};

    # massage content to easily detect if there's any real content
    $content =~ s/\s+//g; # yes! remove all the spaces
    if ( $html ) {
        # remove html version of spaces and newlines
        $content =~ s!&nbsp;!!g;
        $content =~ s!<br/?>!!g;
    }

    # Filter empty content when type is text/html
    return '' if $html && $content !~ /\S/;

    # If we aren't supposed to strip the sig, just bail now.
    return $return_content unless $sigonly;

    # Find the signature
    my $sig = $args{'CurrentUser'}->UserObj->Signature || '';
    $sig =~ s/\s+//g;

    # Check for plaintext sig
    return '' if not $html and $content =~ /^(--)?\Q$sig\E$/;

    # Check for html-formatted sig; we don't use EscapeUTF8 here
    # because we want to precisely match the escapting that FCKEditor
    # uses.
    $sig =~ s/&/&amp;/g;
    $sig =~ s/</&lt;/g;
    $sig =~ s/>/&gt;/g;
    $sig =~ s/"/&quot;/g;
    $sig =~ s/'/&#39;/g;
    return '' if $html and $content =~ m{^(?:<p>)?(--)?\Q$sig\E(?:</p>)?$}s;

    # Pass it through
    return $return_content;
}

sub DecodeARGS {
    my $ARGS = shift;

    %{$ARGS} = map {

        # if they've passed multiple values, they'll be an array. if they've
        # passed just one, a scalar whatever they are, mark them as utf8
        my $type = ref($_);
        ( !$type )
            ? Encode::is_utf8($_)
                ? $_
                : Encode::decode( 'UTF-8' => $_, Encode::FB_PERLQQ )
            : ( $type eq 'ARRAY' )
            ? [ map { ( ref($_) or Encode::is_utf8($_) ) ? $_ : Encode::decode( 'UTF-8' => $_, Encode::FB_PERLQQ ) }
                @$_ ]
            : ( $type eq 'HASH' )
            ? { map { ( ref($_) or Encode::is_utf8($_) ) ? $_ : Encode::decode( 'UTF-8' => $_, Encode::FB_PERLQQ ) }
                %$_ }
            : $_
    } %$ARGS;
}

sub PreprocessTimeUpdates {
    my $ARGS = shift;

    # Later in the code we use
    # $m->comp( { base_comp => $m->request_comp }, $m->fetch_next, %ARGS );
    # instead of $m->call_next to avoid problems with UTF8 keys in arguments.
    # The call_next method pass through original arguments and if you have
    # an argument with unicode key then in a next component you'll get two
    # records in the args hash: one with key without UTF8 flag and another
    # with the flag, which may result into errors. "{ base_comp => $m->request_comp }"
    # is copied from mason's source to get the same results as we get from
    # call_next method, this feature is not documented, so we just leave it
    # here to avoid possible side effects.

    # This code canonicalizes time inputs in hours into minutes
    foreach my $field ( keys %$ARGS ) {
        next unless $field =~ /^(.*)-TimeUnits$/i && $ARGS->{$1};
        my $local = $1;
        $ARGS->{$local} =~ s{\b (?: (\d+) \s+ )? (\d+)/(\d+) \b}
                      {($1 || 0) + $3 ? $2 / $3 : 0}xe;
        if ( $ARGS->{$field} && $ARGS->{$field} =~ /hours/i ) {
            $ARGS->{$local} *= 60;
        }
        delete $ARGS->{$field};
    }

}

sub MaybeEnableSQLStatementLog {

    my $log_sql_statements = RT->Config->Get('StatementLog');

    if ($log_sql_statements) {
        $RT::Handle->ClearSQLStatementLog;
        $RT::Handle->LogSQLStatements(1);
    }

}

sub LogRecordedSQLStatements {
    my %args = @_;

    my $log_sql_statements = RT->Config->Get('StatementLog');

    return unless ($log_sql_statements);

    my @log = $RT::Handle->SQLStatementLog;
    $RT::Handle->ClearSQLStatementLog;

    $RT::Handle->AddRequestToHistory({
        %{ $args{RequestData} },
        Queries => \@log,
    });

    for my $stmt (@log) {
        my ( $time, $sql, $bind, $duration ) = @{$stmt};
        my @bind;
        if ( ref $bind ) {
            @bind = @{$bind};
        } else {

            # Older DBIx-SB
            $duration = $bind;
        }
        $RT::Logger->log(
            level   => $log_sql_statements,
            message => "SQL("
                . sprintf( "%.6f", $duration )
                . "s): $sql;"
                . ( @bind ? "  [ bound values: @{[map{ defined $_ ? qq|'$_'| : 'undef'} @bind]} ]" : "" )
        );
    }

}

my $_has_validated_web_config = 0;
sub ValidateWebConfig {
    my $self = shift;

    # do this once per server instance, not once per request
    return if $_has_validated_web_config;
    $_has_validated_web_config = 1;

    if (!$ENV{'rt.explicit_port'} && $ENV{SERVER_PORT} != RT->Config->Get('WebPort')) {
        $RT::Logger->warn("The actual SERVER_PORT ($ENV{SERVER_PORT}) does NOT match the configured WebPort ($RT::WebPort). Perhaps you should Set(\$WebPort, $ENV{SERVER_PORT}); in RT_SiteConfig.pm, otherwise your internal links may be broken.");
    }

    if ($ENV{HTTP_HOST}) {
        # match "example.com" or "example.com:80"
        my ($host) = $ENV{HTTP_HOST} =~ /^(.*?)(:\d+)?$/;

        if ($host ne RT->Config->Get('WebDomain')) {
            $RT::Logger->warn("The actual HTTP_HOST ($host) does NOT match the configured WebDomain ($RT::WebDomain). Perhaps you should Set(\$WebDomain, '$host'); in RT_SiteConfig.pm, otherwise your internal links may be broken.");
        }
    }
    else {
        if ($ENV{SERVER_NAME} ne RT->Config->Get('WebDomain')) {
            $RT::Logger->warn("The actual SERVER_NAME ($ENV{SERVER_NAME}) does NOT match the configured WebDomain ($RT::WebDomain). Perhaps you should Set(\$WebDomain, '$ENV{SERVER_NAME}'); in RT_SiteConfig.pm, otherwise your internal links may be broken.");
        }
    }

    if ($ENV{SCRIPT_NAME} ne RT->Config->Get('WebPath')) {
        $RT::Logger->warn("The actual SCRIPT_NAME ($ENV{SCRIPT_NAME}) does NOT match the configured WebPath ($RT::WebPath). Perhaps you should Set(\$WebPath, '$ENV{SCRIPT_NAME}'); in RT_SiteConfig.pm, otherwise your internal links may be broken.");
    }
}

sub ComponentRoots {
    my $self = shift;
    my %args = ( Names => 0, @_ );
    my @roots;
    if (defined $HTML::Mason::Commands::m) {
        @roots = $HTML::Mason::Commands::m->interp->comp_root_array;
    } else {
        @roots = (
            [ local    => $RT::MasonLocalComponentRoot ],
            (map {[ "plugin-".$_->Name =>  $_->ComponentRoot ]} @{RT->Plugins}),
            [ standard => $RT::MasonComponentRoot ]
        );
    }
    @roots = map { $_->[1] } @roots unless $args{Names};
    return @roots;
}

our %is_whitelisted_component = (
    # The RSS feed embeds an auth token in the path, but query
    # information for the search.  Because it's a straight-up read, in
    # addition to embedding its own auth, it's fine.
    '/NoAuth/rss/dhandler' => 1,

    # While these can be used for denial-of-service against RT
    # (construct a very inefficient query and trick lots of users into
    # running them against RT) it's incredibly useful to be able to link
    # to a search result or bookmark a result page.
    '/Search/Results.html' => 1,
    '/Search/Simple.html'  => 1,
    '/m/tickets/search'     => 1,
);

# Components which are blacklisted from automatic, argument-based whitelisting.
# These pages are not idempotent when called with just an id.
our %is_blacklisted_component = (
    # Takes only id and toggles bookmark state
    '/Helpers/Toggle/TicketBookmark' => 1,
);

sub IsCompCSRFWhitelisted {
    my $comp = shift;
    my $ARGS = shift;

    return 1 if $is_whitelisted_component{$comp};

    my %args = %{ $ARGS };

    # If the user specifies a *correct* user and pass then they are
    # golden.  This acts on the presumption that external forms may
    # hardcode a username and password -- if a malicious attacker knew
    # both already, CSRF is the least of your problems.
    my $AllowLoginCSRF = not RT->Config->Get('RestrictReferrerLogin');
    if ($AllowLoginCSRF and defined($args{user}) and defined($args{pass})) {
        my $user_obj = RT::CurrentUser->new();
        $user_obj->Load($args{user});
        return 1 if $user_obj->id && $user_obj->IsPassword($args{pass});

        delete $args{user};
        delete $args{pass};
    }

    # Some pages aren't idempotent even with safe args like id; blacklist
    # them from the automatic whitelisting below.
    return 0 if $is_blacklisted_component{$comp};

    # Eliminate arguments that do not indicate an effectful request.
    # For example, "id" is acceptable because that is how RT retrieves a
    # record.
    delete $args{id};

    # If they have a valid results= from MaybeRedirectForResults, that's
    # also fine.
    delete $args{results} if $args{results}
        and $HTML::Mason::Commands::session{"Actions"}->{$args{results}};

    # The homepage refresh, which uses the Refresh header, doesn't send
    # a referer in most browsers; whitelist the one parameter it reloads
    # with, HomeRefreshInterval, which is safe
    delete $args{HomeRefreshInterval};

    # If there are no arguments, then it's likely to be an idempotent
    # request, which are not susceptible to CSRF
    return 1 if !%args;

    return 0;
}

sub IsRefererCSRFWhitelisted {
    my $referer = _NormalizeHost(shift);
    my $base_url = _NormalizeHost(RT->Config->Get('WebBaseURL'));
    $base_url = $base_url->host_port;

    my $configs;
    for my $config ( $base_url, RT->Config->Get('ReferrerWhitelist') ) {
        push @$configs,$config;

        my $host_port = $referer->host_port;
        if ($config =~ /\*/) {
            # Turn a literal * into a domain component or partial component match.
            # Refer to http://tools.ietf.org/html/rfc2818#page-5
            my $regex = join "[a-zA-Z0-9\-]*",
                         map { quotemeta($_) }
                       split /\*/, $config;

            return 1 if $host_port =~ /^$regex$/i;
        } else {
            return 1 if $host_port eq $config;
        }
    }

    return (0,$referer,$configs);
}

=head3 _NormalizeHost

Takes a URI and creates a URI object that's been normalized
to handle common problems such as localhost vs 127.0.0.1

=cut

sub _NormalizeHost {

    my $uri= URI->new(shift);
    $uri->host('127.0.0.1') if $uri->host eq 'localhost';

    return $uri;

}

sub IsPossibleCSRF {
    my $ARGS = shift;

    # If first request on this session is to a REST endpoint, then
    # whitelist the REST endpoints -- and explicitly deny non-REST
    # endpoints.  We do this because using a REST cookie in a browser
    # would open the user to CSRF attacks to the REST endpoints.
    my $path = $HTML::Mason::Commands::r->path_info;
    $HTML::Mason::Commands::session{'REST'} = $path =~ m{^/+REST/\d+\.\d+(/|$)}
        unless defined $HTML::Mason::Commands::session{'REST'};

    if ($HTML::Mason::Commands::session{'REST'}) {
        return 0 if $path =~ m{^/+REST/\d+\.\d+(/|$)};
        my $why = <<EOT;
This login session belongs to a REST client, and cannot be used to
access non-REST interfaces of RT for security reasons.
EOT
        my $details = <<EOT;
Please log out and back in to obtain a session for normal browsing.  If
you understand the security implications, disabling RT's CSRF protection
will remove this restriction.
EOT
        chomp $details;
        HTML::Mason::Commands::Abort( $why, Details => $details );
    }

    return 0 if IsCompCSRFWhitelisted(
        $HTML::Mason::Commands::m->request_comp->path,
        $ARGS
    );

    # if there is no Referer header then assume the worst
    return (1,
            "your browser did not supply a Referrer header", # loc
        ) if !$ENV{HTTP_REFERER};

    my ($whitelisted, $browser, $configs) = IsRefererCSRFWhitelisted($ENV{HTTP_REFERER});
    return 0 if $whitelisted;

    if ( @$configs > 1 ) {
        return (1,
                "the Referrer header supplied by your browser ([_1]) is not allowed by RT's configured hostname ([_2]) or whitelisted hosts ([_3])", # loc
                $browser->host_port,
                shift @$configs,
                join(', ', @$configs) );
    }

    return (1,
            "the Referrer header supplied by your browser ([_1]) is not allowed by RT's configured hostname ([_2])", # loc
            $browser->host_port,
            $configs->[0]);
}

sub ExpandCSRFToken {
    my $ARGS = shift;

    my $token = delete $ARGS->{CSRF_Token};
    return unless $token;

    my $data = $HTML::Mason::Commands::session{'CSRF'}{$token};
    return unless $data;
    return unless $data->{path} eq $HTML::Mason::Commands::r->path_info;

    my $user = $HTML::Mason::Commands::session{'CurrentUser'}->UserObj;
    return unless $user->ValidateAuthString( $data->{auth}, $token );

    %{$ARGS} = %{$data->{args}};
    $HTML::Mason::Commands::DECODED_ARGS = $ARGS;

    # We explicitly stored file attachments with the request, but not in
    # the session yet, as that would itself be an attack.  Put them into
    # the session now, so they'll be visible.
    if ($data->{attach}) {
        my $filename = $data->{attach}{filename};
        my $mime     = $data->{attach}{mime};
        $HTML::Mason::Commands::session{'Attachments'}{$filename}
            = $mime;
    }

    return 1;
}

sub StoreRequestToken {
    my $ARGS = shift;

    my $token = Digest::MD5::md5_hex(time . {} . $$ . rand(1024));
    my $user = $HTML::Mason::Commands::session{'CurrentUser'}->UserObj;
    my $data = {
        auth => $user->GenerateAuthString( $token ),
        path => $HTML::Mason::Commands::r->path_info,
        args => $ARGS,
    };
    if ($ARGS->{Attach}) {
        my $attachment = HTML::Mason::Commands::MakeMIMEEntity( AttachmentFieldName => 'Attach' );
        my $file_path = delete $ARGS->{'Attach'};
        $data->{attach} = {
            filename => Encode::decode_utf8("$file_path"),
            mime     => $attachment,
        };
    }

    $HTML::Mason::Commands::session{'CSRF'}->{$token} = $data;
    $HTML::Mason::Commands::session{'i'}++;
    return $token;
}

sub MaybeShowInterstitialCSRFPage {
    my $ARGS = shift;

    return unless RT->Config->Get('RestrictReferrer');

    # Deal with the form token provided by the interstitial, which lets
    # browsers which never set referer headers still use RT, if
    # painfully.  This blows values into ARGS
    return if ExpandCSRFToken($ARGS);

    my ($is_csrf, $msg, @loc) = IsPossibleCSRF($ARGS);
    return if !$is_csrf;

    $RT::Logger->notice("Possible CSRF: ".RT::CurrentUser->new->loc($msg, @loc));

    my $token = StoreRequestToken($ARGS);
    $HTML::Mason::Commands::m->comp(
        '/Elements/CSRF',
        OriginalURL => RT->Config->Get('WebPath') . $HTML::Mason::Commands::r->path_info,
        Reason => HTML::Mason::Commands::loc( $msg, @loc ),
        Token => $token,
    );
    # Calls abort, never gets here
}

our @POTENTIAL_PAGE_ACTIONS = (
    qr'/Ticket/Create.html' => "create a ticket",              # loc
    qr'/Ticket/'            => "update a ticket",              # loc
    qr'/Admin/'             => "modify RT's configuration",    # loc
    qr'/Approval/'          => "update an approval",           # loc
    qr'/Articles/'          => "update an article",            # loc
    qr'/Dashboards/'        => "modify a dashboard",           # loc
    qr'/m/ticket/'          => "update a ticket",              # loc
    qr'Prefs'               => "modify your preferences",      # loc
    qr'/Search/'            => "modify or access a search",    # loc
    qr'/SelfService/Create' => "create a ticket",              # loc
    qr'/SelfService/'       => "update a ticket",              # loc
);

sub PotentialPageAction {
    my $page = shift;
    my @potentials = @POTENTIAL_PAGE_ACTIONS;
    while (my ($pattern, $result) = splice @potentials, 0, 2) {
        return HTML::Mason::Commands::loc($result)
            if $page =~ $pattern;
    }
    return "";
}

package HTML::Mason::Commands;

use vars qw/$r $m %session/;

sub Menu {
    return $HTML::Mason::Commands::m->notes('menu');
}

sub PageMenu {
    return $HTML::Mason::Commands::m->notes('page-menu');
}

sub PageWidgets {
    return $HTML::Mason::Commands::m->notes('page-widgets');
}



=head2 loc ARRAY

loc is a nice clean global routine which calls $session{'CurrentUser'}->loc()
with whatever it's called with. If there is no $session{'CurrentUser'}, 
it creates a temporary user, so we have something to get a localisation handle
through

=cut

sub loc {

    if ( $session{'CurrentUser'}
        && UNIVERSAL::can( $session{'CurrentUser'}, 'loc' ) )
    {
        return ( $session{'CurrentUser'}->loc(@_) );
    } elsif (
        my $u = eval {
            RT::CurrentUser->new();
        }
        )
    {
        return ( $u->loc(@_) );
    } else {

        # pathetic case -- SystemUser is gone.
        return $_[0];
    }
}



=head2 loc_fuzzy STRING

loc_fuzzy is for handling localizations of messages that may already
contain interpolated variables, typically returned from libraries
outside RT's control.  It takes the message string and extracts the
variable array automatically by matching against the candidate entries
inside the lexicon file.

=cut

sub loc_fuzzy {
    my $msg = shift;

    if ( $session{'CurrentUser'}
        && UNIVERSAL::can( $session{'CurrentUser'}, 'loc' ) )
    {
        return ( $session{'CurrentUser'}->loc_fuzzy($msg) );
    } else {
        my $u = RT::CurrentUser->new( RT->SystemUser->Id );
        return ( $u->loc_fuzzy($msg) );
    }
}


# Error - calls Error and aborts
sub Abort {
    my $why  = shift;
    my %args = @_;

    if (   $session{'ErrorDocument'}
        && $session{'ErrorDocumentType'} )
    {
        $r->content_type( $session{'ErrorDocumentType'} );
        $m->comp( $session{'ErrorDocument'}, Why => $why, %args );
        $m->abort;
    } else {
        $m->comp( "/Elements/Error", Why => $why, %args );
        $m->abort;
    }
}

sub MaybeRedirectForResults {
    my %args = (
        Path      => $HTML::Mason::Commands::m->request_comp->path,
        Arguments => {},
        Anchor    => undef,
        Actions   => undef,
        Force     => 0,
        @_
    );
    my $has_actions = $args{'Actions'} && grep( defined, @{ $args{'Actions'} } );
    return unless $has_actions || $args{'Force'};

    my %arguments = %{ $args{'Arguments'} };

    if ( $has_actions ) {
        my $key = Digest::MD5::md5_hex( rand(1024) );
        push @{ $session{"Actions"}{ $key } ||= [] }, @{ $args{'Actions'} };
        $session{'i'}++;
        $arguments{'results'} = $key;
    }

    $args{'Path'} =~ s!^/+!!;
    my $url = RT->Config->Get('WebURL') . $args{Path};

    if ( keys %arguments ) {
        $url .= '?'. $m->comp( '/Elements/QueryString', %arguments );
    }
    if ( $args{'Anchor'} ) {
        $url .= "#". $args{'Anchor'};
    }
    return RT::Interface::Web::Redirect($url);
}

=head2 MaybeRedirectToApproval Path => 'path', Whitelist => REGEX, ARGSRef => HASHREF

If the ticket specified by C<< $ARGSRef->{id} >> is an approval ticket,
redirect to the approvals display page, preserving any arguments.

C<Path>s matching C<Whitelist> are let through.

This is a no-op if the C<ForceApprovalsView> option isn't enabled.

=cut

sub MaybeRedirectToApproval {
    my %args = (
        Path        => $HTML::Mason::Commands::m->request_comp->path,
        ARGSRef     => {},
        Whitelist   => undef,
        @_
    );

    return unless $ENV{REQUEST_METHOD} eq 'GET';

    my $id = $args{ARGSRef}->{id};

    if (    $id
        and RT->Config->Get('ForceApprovalsView')
        and not $args{Path} =~ /$args{Whitelist}/)
    {
        my $ticket = RT::Ticket->new( $session{'CurrentUser'} );
        $ticket->Load($id);

        if ($ticket and $ticket->id and lc($ticket->Type) eq 'approval') {
            MaybeRedirectForResults(
                Path      => "/Approvals/Display.html",
                Force     => 1,
                Anchor    => $args{ARGSRef}->{Anchor},
                Arguments => $args{ARGSRef},
            );
        }
    }
}

=head2 CreateTicket ARGS

Create a new ticket, using Mason's %ARGS.  returns @results.

=cut

sub CreateTicket {
    my %ARGS = (@_);

    my (@Actions);

    my $Ticket = RT::Ticket->new( $session{'CurrentUser'} );

    my $Queue = RT::Queue->new( $session{'CurrentUser'} );
    unless ( $Queue->Load( $ARGS{'Queue'} ) ) {
        Abort('Queue not found');
    }

    unless ( $Queue->CurrentUserHasRight('CreateTicket') ) {
        Abort('You have no permission to create tickets in that queue.');
    }

    my $due;
    if ( defined $ARGS{'Due'} and $ARGS{'Due'} =~ /\S/ ) {
        $due = RT::Date->new( $session{'CurrentUser'} );
        $due->Set( Format => 'unknown', Value => $ARGS{'Due'} );
    }
    my $starts;
    if ( defined $ARGS{'Starts'} and $ARGS{'Starts'} =~ /\S/ ) {
        $starts = RT::Date->new( $session{'CurrentUser'} );
        $starts->Set( Format => 'unknown', Value => $ARGS{'Starts'} );
    }

    my $sigless = RT::Interface::Web::StripContent(
        Content        => $ARGS{Content},
        ContentType    => $ARGS{ContentType},
        StripSignature => 1,
        CurrentUser    => $session{'CurrentUser'},
    );

    my $MIMEObj = MakeMIMEEntity(
        Subject => $ARGS{'Subject'},
        From    => $ARGS{'From'},
        Cc      => $ARGS{'Cc'},
        Body    => $sigless,
        Type    => $ARGS{'ContentType'},
    );

    if ( $ARGS{'Attachments'} ) {
        my $rv = $MIMEObj->make_multipart;
        $RT::Logger->error("Couldn't make multipart message")
            if !$rv || $rv !~ /^(?:DONE|ALREADY)$/;

        foreach ( values %{ $ARGS{'Attachments'} } ) {
            unless ($_) {
                $RT::Logger->error("Couldn't add empty attachemnt");
                next;
            }
            $MIMEObj->add_part($_);
        }
    }

    for my $argument (qw(Encrypt Sign)) {
        $MIMEObj->head->replace( "X-RT-$argument" => $ARGS{$argument} ? 1 : 0 );
    }

    my %create_args = (
        Type => $ARGS{'Type'} || 'ticket',
        Queue => $ARGS{'Queue'},
        Owner => $ARGS{'Owner'},

        # note: name change
        Requestor       => $ARGS{'Requestors'},
        Cc              => $ARGS{'Cc'},
        AdminCc         => $ARGS{'AdminCc'},
        InitialPriority => $ARGS{'InitialPriority'},
        FinalPriority   => $ARGS{'FinalPriority'},
        TimeLeft        => $ARGS{'TimeLeft'},
        TimeEstimated   => $ARGS{'TimeEstimated'},
        TimeWorked      => $ARGS{'TimeWorked'},
        Subject         => $ARGS{'Subject'},
        Status          => $ARGS{'Status'},
        Due             => $due ? $due->ISO : undef,
        Starts          => $starts ? $starts->ISO : undef,
        MIMEObj         => $MIMEObj
    );

    my @txn_squelch;
    foreach my $type (qw(Requestor Cc AdminCc)) {
        push @txn_squelch, map $_->address, Email::Address->parse( $create_args{$type} )
            if grep $_ eq $type || $_ eq ( $type . 's' ), @{ $ARGS{'SkipNotification'} || [] };
    }
    $create_args{TransSquelchMailTo} = \@txn_squelch
        if @txn_squelch;

    if ( $ARGS{'AttachTickets'} ) {
        require RT::Action::SendEmail;
        RT::Action::SendEmail->AttachTickets( RT::Action::SendEmail->AttachTickets,
            ref $ARGS{'AttachTickets'}
            ? @{ $ARGS{'AttachTickets'} }
            : ( $ARGS{'AttachTickets'} ) );
    }

    foreach my $arg ( keys %ARGS ) {
        next if $arg =~ /-(?:Magic|Category)$/;

        if ( $arg =~ /^Object-RT::Transaction--CustomField-/ ) {
            $create_args{$arg} = $ARGS{$arg};
        }

        # Object-RT::Ticket--CustomField-3-Values
        elsif ( $arg =~ /^Object-RT::Ticket--CustomField-(\d+)/ ) {
            my $cfid = $1;

            my $cf = RT::CustomField->new( $session{'CurrentUser'} );
            $cf->SetContextObject( $Queue );
            $cf->Load($cfid);
            unless ( $cf->id ) {
                $RT::Logger->error( "Couldn't load custom field #" . $cfid );
                next;
            }

            if ( $arg =~ /-Upload$/ ) {
                $create_args{"CustomField-$cfid"} = _UploadedFile($arg);
                next;
            }

            my $type = $cf->Type;

            my @values = ();
            if ( ref $ARGS{$arg} eq 'ARRAY' ) {
                @values = @{ $ARGS{$arg} };
            } elsif ( $type =~ /text/i ) {
                @values = ( $ARGS{$arg} );
            } else {
                no warnings 'uninitialized';
                @values = split /\r*\n/, $ARGS{$arg};
            }
            @values = grep length, map {
                s/\r+\n/\n/g;
                s/^\s+//;
                s/\s+$//;
                $_;
                }
                grep defined, @values;

            $create_args{"CustomField-$cfid"} = \@values;
        }
    }

    # turn new link lists into arrays, and pass in the proper arguments
    my %map = (
        'new-DependsOn' => 'DependsOn',
        'DependsOn-new' => 'DependedOnBy',
        'new-MemberOf'  => 'Parents',
        'MemberOf-new'  => 'Children',
        'new-RefersTo'  => 'RefersTo',
        'RefersTo-new'  => 'ReferredToBy',
    );
    foreach my $key ( keys %map ) {
        next unless $ARGS{$key};
        $create_args{ $map{$key} } = [ grep $_, split ' ', $ARGS{$key} ];

    }

    my ( $id, $Trans, $ErrMsg ) = $Ticket->Create(%create_args);
    unless ($id) {
        Abort($ErrMsg);
    }

    push( @Actions, split( "\n", $ErrMsg ) );
    unless ( $Ticket->CurrentUserHasRight('ShowTicket') ) {
        Abort( "No permission to view newly created ticket #" . $Ticket->id . "." );
    }
    return ( $Ticket, @Actions );

}



=head2  LoadTicket id

Takes a ticket id as its only variable. if it's handed an array, it takes
the first value.

Returns an RT::Ticket object as the current user.

=cut

sub LoadTicket {
    my $id = shift;

    if ( ref($id) eq "ARRAY" ) {
        $id = $id->[0];
    }

    unless ($id) {
        Abort("No ticket specified");
    }

    my $Ticket = RT::Ticket->new( $session{'CurrentUser'} );
    $Ticket->Load($id);
    unless ( $Ticket->id ) {
        Abort("Could not load ticket $id");
    }
    return $Ticket;
}



=head2 ProcessUpdateMessage

Takes paramhash with fields ARGSRef, TicketObj and SkipSignatureOnly.

Don't write message if it only contains current user's signature and
SkipSignatureOnly argument is true. Function anyway adds attachments
and updates time worked field even if skips message. The default value
is true.

=cut

sub ProcessUpdateMessage {

    my %args = (
        ARGSRef           => undef,
        TicketObj         => undef,
        SkipSignatureOnly => 1,
        @_
    );

    if ( $args{ARGSRef}->{'UpdateAttachments'}
        && !keys %{ $args{ARGSRef}->{'UpdateAttachments'} } )
    {
        delete $args{ARGSRef}->{'UpdateAttachments'};
    }

    # Strip the signature
    $args{ARGSRef}->{UpdateContent} = RT::Interface::Web::StripContent(
        Content        => $args{ARGSRef}->{UpdateContent},
        ContentType    => $args{ARGSRef}->{UpdateContentType},
        StripSignature => $args{SkipSignatureOnly},
        CurrentUser    => $args{'TicketObj'}->CurrentUser,
    );

    # If, after stripping the signature, we have no message, move the
    # UpdateTimeWorked into adjusted TimeWorked, so that a later
    # ProcessBasics can deal -- then bail out.
    if (    not $args{ARGSRef}->{'UpdateAttachments'}
        and not length $args{ARGSRef}->{'UpdateContent'} )
    {
        if ( $args{ARGSRef}->{'UpdateTimeWorked'} ) {
            $args{ARGSRef}->{TimeWorked} = $args{TicketObj}->TimeWorked + delete $args{ARGSRef}->{'UpdateTimeWorked'};
        }
        return;
    }

    if ( $args{ARGSRef}->{'UpdateSubject'} eq ($args{'TicketObj'}->Subject || '') ) {
        $args{ARGSRef}->{'UpdateSubject'} = undef;
    }

    my $Message = MakeMIMEEntity(
        Subject => $args{ARGSRef}->{'UpdateSubject'},
        Body    => $args{ARGSRef}->{'UpdateContent'},
        Type    => $args{ARGSRef}->{'UpdateContentType'},
    );

    $Message->head->replace( 'Message-ID' => Encode::encode_utf8(
        RT::Interface::Email::GenMessageId( Ticket => $args{'TicketObj'} )
    ) );
    my $old_txn = RT::Transaction->new( $session{'CurrentUser'} );
    if ( $args{ARGSRef}->{'QuoteTransaction'} ) {
        $old_txn->Load( $args{ARGSRef}->{'QuoteTransaction'} );
    } else {
        $old_txn = $args{TicketObj}->Transactions->First();
    }

    if ( my $msg = $old_txn->Message->First ) {
        RT::Interface::Email::SetInReplyTo(
            Message   => $Message,
            InReplyTo => $msg
        );
    }

    if ( $args{ARGSRef}->{'UpdateAttachments'} ) {
        $Message->make_multipart;
        $Message->add_part($_) foreach values %{ $args{ARGSRef}->{'UpdateAttachments'} };
    }

    if ( $args{ARGSRef}->{'AttachTickets'} ) {
        require RT::Action::SendEmail;
        RT::Action::SendEmail->AttachTickets( RT::Action::SendEmail->AttachTickets,
            ref $args{ARGSRef}->{'AttachTickets'}
            ? @{ $args{ARGSRef}->{'AttachTickets'} }
            : ( $args{ARGSRef}->{'AttachTickets'} ) );
    }

    my %message_args = (
        Sign         => ( $args{ARGSRef}->{'Sign'} ? 1 : 0 ),
        Encrypt      => ( $args{ARGSRef}->{'Encrypt'} ? 1 : 0 ),
        MIMEObj      => $Message,
        TimeTaken    => $args{ARGSRef}->{'UpdateTimeWorked'}
    );

    _ProcessUpdateMessageRecipients(
        MessageArgs => \%message_args,
        %args,
    );

    my @results;
    if ( $args{ARGSRef}->{'UpdateType'} =~ /^(private|public)$/ ) {
        my ( $Transaction, $Description, $Object ) = $args{TicketObj}->Comment(%message_args);
        push( @results, $Description );
        $Object->UpdateCustomFields( ARGSRef => $args{ARGSRef} ) if $Object;
    } elsif ( $args{ARGSRef}->{'UpdateType'} eq 'response' ) {
        my ( $Transaction, $Description, $Object ) = $args{TicketObj}->Correspond(%message_args);
        push( @results, $Description );
        $Object->UpdateCustomFields( ARGSRef => $args{ARGSRef} ) if $Object;
    } else {
        push( @results,
            loc("Update type was neither correspondence nor comment.") . " " . loc("Update not recorded.") );
    }
    return @results;
}

sub _ProcessUpdateMessageRecipients {
    my %args = (
        ARGSRef           => undef,
        TicketObj         => undef,
        MessageArgs       => undef,
        @_,
    );

    my $bcc = $args{ARGSRef}->{'UpdateBcc'};
    my $cc  = $args{ARGSRef}->{'UpdateCc'};

    my $message_args = $args{MessageArgs};

    $message_args->{CcMessageTo} = $cc;
    $message_args->{BccMessageTo} = $bcc;

    my @txn_squelch;
    foreach my $type (qw(Cc AdminCc)) {
        if (grep $_ eq $type || $_ eq ( $type . 's' ), @{ $args{ARGSRef}->{'SkipNotification'} || [] }) {
            push @txn_squelch, map $_->address, Email::Address->parse( $message_args->{$type} );
            push @txn_squelch, $args{TicketObj}->$type->MemberEmailAddresses;
            push @txn_squelch, $args{TicketObj}->QueueObj->$type->MemberEmailAddresses;
        }
    }
    if (grep $_ eq 'Requestor' || $_ eq 'Requestors', @{ $args{ARGSRef}->{'SkipNotification'} || [] }) {
        push @txn_squelch, map $_->address, Email::Address->parse( $message_args->{Requestor} );
        push @txn_squelch, $args{TicketObj}->Requestors->MemberEmailAddresses;
    }

    push @txn_squelch, @{$args{ARGSRef}{SquelchMailTo}} if $args{ARGSRef}{SquelchMailTo};
    $message_args->{SquelchMailTo} = \@txn_squelch
        if @txn_squelch;

    unless ( $args{'ARGSRef'}->{'UpdateIgnoreAddressCheckboxes'} ) {
        foreach my $key ( keys %{ $args{ARGSRef} } ) {
            next unless $key =~ /^Update(Cc|Bcc)-(.*)$/;

            my $var   = ucfirst($1) . 'MessageTo';
            my $value = $2;
            if ( $message_args->{$var} ) {
                $message_args->{$var} .= ", $value";
            } else {
                $message_args->{$var} = $value;
            }
        }
    }
}



=head2 MakeMIMEEntity PARAMHASH

Takes a paramhash Subject, Body and AttachmentFieldName.

Also takes Form, Cc and Type as optional paramhash keys.

  Returns a MIME::Entity.

=cut

sub MakeMIMEEntity {

    #TODO document what else this takes.
    my %args = (
        Subject             => undef,
        From                => undef,
        Cc                  => undef,
        Body                => undef,
        AttachmentFieldName => undef,
        Type                => undef,
        @_,
    );
    my $Message = MIME::Entity->build(
        Type    => 'multipart/mixed',
        "Message-Id" => Encode::encode_utf8( RT::Interface::Email::GenMessageId ),
        map { $_ => Encode::encode_utf8( $args{ $_} ) }
            grep defined $args{$_}, qw(Subject From Cc)
    );

    if ( defined $args{'Body'} && length $args{'Body'} ) {

        # Make the update content have no 'weird' newlines in it
        $args{'Body'} =~ s/\r\n/\n/gs;

        $Message->attach(
            Type    => $args{'Type'} || 'text/plain',
            Charset => 'UTF-8',
            Data    => $args{'Body'},
        );
    }

    if ( $args{'AttachmentFieldName'} ) {

        my $cgi_object = $m->cgi_object;
        my $filehandle = $cgi_object->upload( $args{'AttachmentFieldName'} );
        if ( defined $filehandle && length $filehandle ) {

            my ( @content, $buffer );
            while ( my $bytesread = read( $filehandle, $buffer, 4096 ) ) {
                push @content, $buffer;
            }

            my $uploadinfo = $cgi_object->uploadInfo($filehandle);

            my $filename = "$filehandle";
            $filename =~ s{^.*[\\/]}{};

            $Message->attach(
                Type     => $uploadinfo->{'Content-Type'},
                Filename => $filename,
                Data     => \@content,
            );
            if ( !$args{'Subject'} && !( defined $args{'Body'} && length $args{'Body'} ) ) {
                $Message->head->set( 'Subject' => $filename );
            }

            # Attachment parts really shouldn't get a Message-ID
            $Message->head->delete('Message-ID');
        }
    }

    $Message->make_singlepart;

    RT::I18N::SetMIMEEntityToUTF8($Message);    # convert text parts into utf-8

    return ($Message);

}



=head2 ParseDateToISO

Takes a date in an arbitrary format.
Returns an ISO date and time in GMT

=cut

sub ParseDateToISO {
    my $date = shift;

    my $date_obj = RT::Date->new( $session{'CurrentUser'} );
    $date_obj->Set(
        Format => 'unknown',
        Value  => $date
    );
    return ( $date_obj->ISO );
}



sub ProcessACLChanges {
    my $ARGSref = shift;

    #XXX: why don't we get ARGSref like in other Process* subs?

    my @results;

    foreach my $arg ( keys %$ARGSref ) {
        next unless ( $arg =~ /^(GrantRight|RevokeRight)-(\d+)-(.+?)-(\d+)$/ );

        my ( $method, $principal_id, $object_type, $object_id ) = ( $1, $2, $3, $4 );

        my @rights;
        if ( UNIVERSAL::isa( $ARGSref->{$arg}, 'ARRAY' ) ) {
            @rights = @{ $ARGSref->{$arg} };
        } else {
            @rights = $ARGSref->{$arg};
        }
        @rights = grep $_, @rights;
        next unless @rights;

        my $principal = RT::Principal->new( $session{'CurrentUser'} );
        $principal->Load($principal_id);

        my $obj;
        if ( $object_type eq 'RT::System' ) {
            $obj = $RT::System;
        } elsif ( $RT::ACE::OBJECT_TYPES{$object_type} ) {
            $obj = $object_type->new( $session{'CurrentUser'} );
            $obj->Load($object_id);
            unless ( $obj->id ) {
                $RT::Logger->error("couldn't load $object_type #$object_id");
                next;
            }
        } else {
            $RT::Logger->error("object type '$object_type' is incorrect");
            push( @results, loc("System Error") . ': ' . loc( "Rights could not be granted for [_1]", $object_type ) );
            next;
        }

        foreach my $right (@rights) {
            my ( $val, $msg ) = $principal->$method( Object => $obj, Right => $right );
            push( @results, $msg );
        }
    }

    return (@results);
}


=head2 ProcessACLs

ProcessACLs expects values from a series of checkboxes that describe the full
set of rights a principal should have on an object.

It expects form inputs with names like SetRights-PrincipalId-ObjType-ObjId
instead of with the prefixes Grant/RevokeRight.  Each input should be an array
listing the rights the principal should have, and ProcessACLs will modify the
current rights to match.  Additionally, the previously unused CheckACL input
listing PrincipalId-ObjType-ObjId is now used to catch cases when all the
rights are removed from a principal and as such no SetRights input is
submitted.

=cut

sub ProcessACLs {
    my $ARGSref = shift;
    my (%state, @results);

    my $CheckACL = $ARGSref->{'CheckACL'};
    my @check = grep { defined } (ref $CheckACL eq 'ARRAY' ? @$CheckACL : $CheckACL);

    # Check if we want to grant rights to a previously rights-less user
    for my $type (qw(user group)) {
        my $key = "AddPrincipalForRights-$type";

        next unless $ARGSref->{$key};

        my $principal;
        if ( $type eq 'user' ) {
            $principal = RT::User->new( $session{'CurrentUser'} );
            $principal->LoadByCol( Name => $ARGSref->{$key} );
        }
        else {
            $principal = RT::Group->new( $session{'CurrentUser'} );
            $principal->LoadUserDefinedGroup( $ARGSref->{$key} );
        }

        unless ($principal->PrincipalId) {
            push @results, loc("Couldn't load the specified principal");
            next;
        }

        my $principal_id = $principal->PrincipalId;

        # Turn our addprincipal rights spec into a real one
        for my $arg (keys %$ARGSref) {
            next unless $arg =~ /^SetRights-addprincipal-(.+?-\d+)$/;

            my $tuple = "$principal_id-$1";
            my $key   = "SetRights-$tuple";

            # If we have it already, that's odd, but merge them
            if (grep { $_ eq $tuple } @check) {
                $ARGSref->{$key} = [
                    (ref $ARGSref->{$key} eq 'ARRAY' ? @{$ARGSref->{$key}} : $ARGSref->{$key}),
                    (ref $ARGSref->{$arg} eq 'ARRAY' ? @{$ARGSref->{$arg}} : $ARGSref->{$arg}),
                ];
            } else {
                $ARGSref->{$key} = $ARGSref->{$arg};
                push @check, $tuple;
            }
        }
    }

    # Build our rights state for each Principal-Object tuple
    foreach my $arg ( keys %$ARGSref ) {
        next unless $arg =~ /^SetRights-(\d+-.+?-\d+)$/;

        my $tuple  = $1;
        my $value  = $ARGSref->{$arg};
        my @rights = grep { $_ } (ref $value eq 'ARRAY' ? @$value : $value);
        next unless @rights;

        $state{$tuple} = { map { $_ => 1 } @rights };
    }

    foreach my $tuple (List::MoreUtils::uniq @check) {
        next unless $tuple =~ /^(\d+)-(.+?)-(\d+)$/;

        my ( $principal_id, $object_type, $object_id ) = ( $1, $2, $3 );

        my $principal = RT::Principal->new( $session{'CurrentUser'} );
        $principal->Load($principal_id);

        my $obj;
        if ( $object_type eq 'RT::System' ) {
            $obj = $RT::System;
        } elsif ( $RT::ACE::OBJECT_TYPES{$object_type} ) {
            $obj = $object_type->new( $session{'CurrentUser'} );
            $obj->Load($object_id);
            unless ( $obj->id ) {
                $RT::Logger->error("couldn't load $object_type #$object_id");
                next;
            }
        } else {
            $RT::Logger->error("object type '$object_type' is incorrect");
            push( @results, loc("System Error") . ': ' . loc( "Rights could not be granted for [_1]", $object_type ) );
            next;
        }

        my $acls = RT::ACL->new($session{'CurrentUser'});
        $acls->LimitToObject( $obj );
        $acls->LimitToPrincipal( Id => $principal_id );

        while ( my $ace = $acls->Next ) {
            my $right = $ace->RightName;

            # Has right and should have right
            next if delete $state{$tuple}->{$right};

            # Has right and shouldn't have right
            my ($val, $msg) = $principal->RevokeRight( Object => $obj, Right => $right );
            push @results, $msg;
        }

        # For everything left, they don't have the right but they should
        for my $right (keys %{ $state{$tuple} || {} }) {
            delete $state{$tuple}->{$right};
            my ($val, $msg) = $principal->GrantRight( Object => $obj, Right => $right );
            push @results, $msg;
        }

        # Check our state for leftovers
        if ( keys %{ $state{$tuple} || {} } ) {
            my $missed = join '|', %{$state{$tuple} || {}};
            $RT::Logger->warn(
               "Uh-oh, it looks like we somehow missed a right in "
              ."ProcessACLs.  Here's what was leftover: $missed"
            );
        }
    }

    return (@results);
}




=head2 UpdateRecordObj ( ARGSRef => \%ARGS, Object => RT::Record, AttributesRef => \@attribs)

@attribs is a list of ticket fields to check and update if they differ from the  B<Object>'s current values. ARGSRef is a ref to HTML::Mason's %ARGS.

Returns an array of success/failure messages

=cut

sub UpdateRecordObject {
    my %args = (
        ARGSRef         => undef,
        AttributesRef   => undef,
        Object          => undef,
        AttributePrefix => undef,
        @_
    );

    my $Object  = $args{'Object'};
    my @results = $Object->Update(
        AttributesRef   => $args{'AttributesRef'},
        ARGSRef         => $args{'ARGSRef'},
        AttributePrefix => $args{'AttributePrefix'},
    );

    return (@results);
}



sub ProcessCustomFieldUpdates {
    my %args = (
        CustomFieldObj => undef,
        ARGSRef        => undef,
        @_
    );

    my $Object  = $args{'CustomFieldObj'};
    my $ARGSRef = $args{'ARGSRef'};

    my @attribs = qw(Name Type Description Queue SortOrder);
    my @results = UpdateRecordObject(
        AttributesRef => \@attribs,
        Object        => $Object,
        ARGSRef       => $ARGSRef
    );

    my $prefix = "CustomField-" . $Object->Id;
    if ( $ARGSRef->{"$prefix-AddValue-Name"} ) {
        my ( $addval, $addmsg ) = $Object->AddValue(
            Name        => $ARGSRef->{"$prefix-AddValue-Name"},
            Description => $ARGSRef->{"$prefix-AddValue-Description"},
            SortOrder   => $ARGSRef->{"$prefix-AddValue-SortOrder"},
        );
        push( @results, $addmsg );
    }

    my @delete_values
        = ( ref $ARGSRef->{"$prefix-DeleteValue"} eq 'ARRAY' )
        ? @{ $ARGSRef->{"$prefix-DeleteValue"} }
        : ( $ARGSRef->{"$prefix-DeleteValue"} );

    foreach my $id (@delete_values) {
        next unless defined $id;
        my ( $err, $msg ) = $Object->DeleteValue($id);
        push( @results, $msg );
    }

    my $vals = $Object->Values();
    while ( my $cfv = $vals->Next() ) {
        if ( my $so = $ARGSRef->{ "$prefix-SortOrder" . $cfv->Id } ) {
            if ( $cfv->SortOrder != $so ) {
                my ( $err, $msg ) = $cfv->SetSortOrder($so);
                push( @results, $msg );
            }
        }
    }

    return (@results);
}



=head2 ProcessTicketBasics ( TicketObj => $Ticket, ARGSRef => \%ARGS );

Returns an array of results messages.

=cut

sub ProcessTicketBasics {

    my %args = (
        TicketObj => undef,
        ARGSRef   => undef,
        @_
    );

    my $TicketObj = $args{'TicketObj'};
    my $ARGSRef   = $args{'ARGSRef'};

    my $OrigOwner = $TicketObj->Owner;

    # Set basic fields
    my @attribs = qw(
        Subject
        FinalPriority
        Priority
        TimeEstimated
        TimeWorked
        TimeLeft
        Type
        Status
        Queue
    );

    # Canonicalize Queue and Owner to their IDs if they aren't numeric
    for my $field (qw(Queue Owner)) {
        if ( $ARGSRef->{$field} and ( $ARGSRef->{$field} !~ /^(\d+)$/ ) ) {
            my $class = $field eq 'Owner' ? "RT::User" : "RT::$field";
            my $temp = $class->new(RT->SystemUser);
            $temp->Load( $ARGSRef->{$field} );
            if ( $temp->id ) {
                $ARGSRef->{$field} = $temp->id;
            }
        }
    }

    # Status isn't a field that can be set to a null value.
    # RT core complains if you try
    delete $ARGSRef->{'Status'} unless $ARGSRef->{'Status'};

    my @results = UpdateRecordObject(
        AttributesRef => \@attribs,
        Object        => $TicketObj,
        ARGSRef       => $ARGSRef,
    );

    # We special case owner changing, so we can use ForceOwnerChange
    if ( $ARGSRef->{'Owner'}
      && $ARGSRef->{'Owner'} !~ /\D/
      && ( $OrigOwner != $ARGSRef->{'Owner'} ) ) {
        my ($ChownType);
        if ( $ARGSRef->{'ForceOwnerChange'} ) {
            $ChownType = "Force";
        }
        else {
            $ChownType = "Set";
        }

        my ( $val, $msg ) = $TicketObj->SetOwner( $ARGSRef->{'Owner'}, $ChownType );
        push( @results, $msg );
    }

    # }}}

    return (@results);
}

sub ProcessTicketReminders {
    my %args = (
        TicketObj => undef,
        ARGSRef   => undef,
        @_
    );

    my $Ticket = $args{'TicketObj'};
    my $args   = $args{'ARGSRef'};
    my @results;

    my $reminder_collection = $Ticket->Reminders->Collection;

    if ( $args->{'update-reminders'} ) {
        while ( my $reminder = $reminder_collection->Next ) {
            my $resolve_status = $reminder->QueueObj->Lifecycle->ReminderStatusOnResolve;
            if (   $reminder->Status ne $resolve_status && $args->{ 'Complete-Reminder-' . $reminder->id } ) {
                $Ticket->Reminders->Resolve($reminder);
            }
            elsif ( $reminder->Status eq $resolve_status && !$args->{ 'Complete-Reminder-' . $reminder->id } ) {
                $Ticket->Reminders->Open($reminder);
            }

            if ( exists( $args->{ 'Reminder-Subject-' . $reminder->id } ) && ( $reminder->Subject ne $args->{ 'Reminder-Subject-' . $reminder->id } )) {
                $reminder->SetSubject( $args->{ 'Reminder-Subject-' . $reminder->id } ) ;
            }

            if ( exists( $args->{ 'Reminder-Owner-' . $reminder->id } ) && ( $reminder->Owner != $args->{ 'Reminder-Owner-' . $reminder->id } )) {
                $reminder->SetOwner( $args->{ 'Reminder-Owner-' . $reminder->id } , "Force" ) ;
            }

            if ( exists( $args->{ 'Reminder-Due-' . $reminder->id } ) && $args->{ 'Reminder-Due-' . $reminder->id } ne '' ) {
                my $DateObj = RT::Date->new( $session{'CurrentUser'} );
                $DateObj->Set(
                    Format => 'unknown',
                    Value  => $args->{ 'Reminder-Due-' . $reminder->id }
                );
                if ( defined $DateObj->Unix && $DateObj->Unix != $reminder->DueObj->Unix ) {
                    $reminder->SetDue( $DateObj->ISO );
                }
            }
        }
    }

    if ( $args->{'NewReminder-Subject'} ) {
        my $due_obj = RT::Date->new( $session{'CurrentUser'} );
        $due_obj->Set(
          Format => 'unknown',
          Value => $args->{'NewReminder-Due'}
        );
        my ( $add_id, $msg, $txnid ) = $Ticket->Reminders->Add(
            Subject => $args->{'NewReminder-Subject'},
            Owner   => $args->{'NewReminder-Owner'},
            Due     => $due_obj->ISO
        );
        push @results, loc("Reminder '[_1]' added", $args->{'NewReminder-Subject'});
    }
    return @results;
}

sub ProcessTicketCustomFieldUpdates {
    my %args = @_;
    $args{'Object'} = delete $args{'TicketObj'};
    my $ARGSRef = { %{ $args{'ARGSRef'} } };

    # Build up a list of objects that we want to work with
    my %custom_fields_to_mod;
    foreach my $arg ( keys %$ARGSRef ) {
        if ( $arg =~ /^Ticket-(\d+-.*)/ ) {
            $ARGSRef->{"Object-RT::Ticket-$1"} = delete $ARGSRef->{$arg};
        } elsif ( $arg =~ /^CustomField-(\d+-.*)/ ) {
            $ARGSRef->{"Object-RT::Ticket--$1"} = delete $ARGSRef->{$arg};
        }
    }

    return ProcessObjectCustomFieldUpdates( %args, ARGSRef => $ARGSRef );
}

sub ProcessObjectCustomFieldUpdates {
    my %args    = @_;
    my $ARGSRef = $args{'ARGSRef'};
    my @results;

    # Build up a list of objects that we want to work with
    my %custom_fields_to_mod;
    foreach my $arg ( keys %$ARGSRef ) {

        # format: Object-<object class>-<object id>-CustomField-<CF id>-<commands>
        next unless $arg =~ /^Object-([\w:]+)-(\d*)-CustomField-(\d+)-(.*)$/;

        # For each of those objects, find out what custom fields we want to work with.
        $custom_fields_to_mod{$1}{ $2 || 0 }{$3}{$4} = $ARGSRef->{$arg};
    }

    # For each of those objects
    foreach my $class ( keys %custom_fields_to_mod ) {
        foreach my $id ( keys %{ $custom_fields_to_mod{$class} } ) {
            my $Object = $args{'Object'};
            $Object = $class->new( $session{'CurrentUser'} )
                unless $Object && ref $Object eq $class;

            $Object->Load($id) unless ( $Object->id || 0 ) == $id;
            unless ( $Object->id ) {
                $RT::Logger->warning("Couldn't load object $class #$id");
                next;
            }

            foreach my $cf ( keys %{ $custom_fields_to_mod{$class}{$id} } ) {
                my $CustomFieldObj = RT::CustomField->new( $session{'CurrentUser'} );
                $CustomFieldObj->SetContextObject($Object);
                $CustomFieldObj->LoadById($cf);
                unless ( $CustomFieldObj->id ) {
                    $RT::Logger->warning("Couldn't load custom field #$cf");
                    next;
                }
                push @results,
                    _ProcessObjectCustomFieldUpdates(
                    Prefix      => "Object-$class-$id-CustomField-$cf-",
                    Object      => $Object,
                    CustomField => $CustomFieldObj,
                    ARGS        => $custom_fields_to_mod{$class}{$id}{$cf},
                    );
            }
        }
    }
    return @results;
}

sub _ProcessObjectCustomFieldUpdates {
    my %args    = @_;
    my $cf      = $args{'CustomField'};
    my $cf_type = $cf->Type || '';

    # Remove blank Values since the magic field will take care of this. Sometimes
    # the browser gives you a blank value which causes CFs to be processed twice
    if (   defined $args{'ARGS'}->{'Values'}
        && !length $args{'ARGS'}->{'Values'}
        && $args{'ARGS'}->{'Values-Magic'} )
    {
        delete $args{'ARGS'}->{'Values'};
    }

    my @results;
    foreach my $arg ( keys %{ $args{'ARGS'} } ) {

        # skip category argument
        next if $arg eq 'Category';

        # since http won't pass in a form element with a null value, we need
        # to fake it
        if ( $arg eq 'Values-Magic' ) {

            # We don't care about the magic, if there's really a values element;
            next if defined $args{'ARGS'}->{'Value'}  && length $args{'ARGS'}->{'Value'};
            next if defined $args{'ARGS'}->{'Values'} && length $args{'ARGS'}->{'Values'};

            # "Empty" values does not mean anything for Image and Binary fields
            next if $cf_type =~ /^(?:Image|Binary)$/;

            $arg = 'Values';
            $args{'ARGS'}->{'Values'} = undef;
        }

        my @values = ();
        if ( ref $args{'ARGS'}->{$arg} eq 'ARRAY' ) {
            @values = @{ $args{'ARGS'}->{$arg} };
        } elsif ( $cf_type =~ /text/i ) {    # Both Text and Wikitext
            @values = ( $args{'ARGS'}->{$arg} );
        } else {
            @values = split /\r*\n/, $args{'ARGS'}->{$arg}
                if defined $args{'ARGS'}->{$arg};
        }
        @values = grep length, map {
            s/\r+\n/\n/g;
            s/^\s+//;
            s/\s+$//;
            $_;
            }
            grep defined, @values;

        if ( $arg eq 'AddValue' || $arg eq 'Value' ) {
            foreach my $value (@values) {
                my ( $val, $msg ) = $args{'Object'}->AddCustomFieldValue(
                    Field => $cf->id,
                    Value => $value
                );
                push( @results, $msg );
            }
        } elsif ( $arg eq 'Upload' ) {
            my $value_hash = _UploadedFile( $args{'Prefix'} . $arg ) or next;
            my ( $val, $msg ) = $args{'Object'}->AddCustomFieldValue( %$value_hash, Field => $cf, );
            push( @results, $msg );
        } elsif ( $arg eq 'DeleteValues' ) {
            foreach my $value (@values) {
                my ( $val, $msg ) = $args{'Object'}->DeleteCustomFieldValue(
                    Field => $cf,
                    Value => $value,
                );
                push( @results, $msg );
            }
        } elsif ( $arg eq 'DeleteValueIds' ) {
            foreach my $value (@values) {
                my ( $val, $msg ) = $args{'Object'}->DeleteCustomFieldValue(
                    Field   => $cf,
                    ValueId => $value,
                );
                push( @results, $msg );
            }
        } elsif ( $arg eq 'Values' && !$cf->Repeated ) {
            my $cf_values = $args{'Object'}->CustomFieldValues( $cf->id );

            my %values_hash;
            foreach my $value (@values) {
                if ( my $entry = $cf_values->HasEntry($value) ) {
                    $values_hash{ $entry->id } = 1;
                    next;
                }

                my ( $val, $msg ) = $args{'Object'}->AddCustomFieldValue(
                    Field => $cf,
                    Value => $value
                );
                push( @results, $msg );
                $values_hash{$val} = 1 if $val;
            }

            # For Date Cfs, @values is empty when there is no changes (no datas in form input)
            return @results if ( $cf->Type =~ /^Date(?:Time)?$/ && ! @values );

            $cf_values->RedoSearch;
            while ( my $cf_value = $cf_values->Next ) {
                next if $values_hash{ $cf_value->id };

                my ( $val, $msg ) = $args{'Object'}->DeleteCustomFieldValue(
                    Field   => $cf,
                    ValueId => $cf_value->id
                );
                push( @results, $msg );
            }
        } elsif ( $arg eq 'Values' ) {
            my $cf_values = $args{'Object'}->CustomFieldValues( $cf->id );

            # keep everything up to the point of difference, delete the rest
            my $delete_flag;
            foreach my $old_cf ( @{ $cf_values->ItemsArrayRef } ) {
                if ( !$delete_flag and @values and $old_cf->Content eq $values[0] ) {
                    shift @values;
                    next;
                }

                $delete_flag ||= 1;
                $old_cf->Delete;
            }

            # now add/replace extra things, if any
            foreach my $value (@values) {
                my ( $val, $msg ) = $args{'Object'}->AddCustomFieldValue(
                    Field => $cf,
                    Value => $value
                );
                push( @results, $msg );
            }
        } else {
            push(
                @results,
                loc("User asked for an unknown update type for custom field [_1] for [_2] object #[_3]",
                    $cf->Name, ref $args{'Object'},
                    $args{'Object'}->id
                )
            );
        }
    }
    return @results;
}


=head2 ProcessTicketWatchers ( TicketObj => $Ticket, ARGSRef => \%ARGS );

Returns an array of results messages.

=cut

sub ProcessTicketWatchers {
    my %args = (
        TicketObj => undef,
        ARGSRef   => undef,
        @_
    );
    my (@results);

    my $Ticket  = $args{'TicketObj'};
    my $ARGSRef = $args{'ARGSRef'};

    # Munge watchers

    foreach my $key ( keys %$ARGSRef ) {

        # Delete deletable watchers
        if ( $key =~ /^Ticket-DeleteWatcher-Type-(.*)-Principal-(\d+)$/ ) {
            my ( $code, $msg ) = $Ticket->DeleteWatcher(
                PrincipalId => $2,
                Type        => $1
            );
            push @results, $msg;
        }

        # Delete watchers in the simple style demanded by the bulk manipulator
        elsif ( $key =~ /^Delete(Requestor|Cc|AdminCc)$/ ) {
            my ( $code, $msg ) = $Ticket->DeleteWatcher(
                Email => $ARGSRef->{$key},
                Type  => $1
            );
            push @results, $msg;
        }

        # Add new wathchers by email address
        elsif ( ( $ARGSRef->{$key} || '' ) =~ /^(?:AdminCc|Cc|Requestor)$/
            and $key =~ /^WatcherTypeEmail(\d*)$/ )
        {

            #They're in this order because otherwise $1 gets clobbered :/
            my ( $code, $msg ) = $Ticket->AddWatcher(
                Type  => $ARGSRef->{$key},
                Email => $ARGSRef->{ "WatcherAddressEmail" . $1 }
            );
            push @results, $msg;
        }

        #Add requestors in the simple style demanded by the bulk manipulator
        elsif ( $key =~ /^Add(Requestor|Cc|AdminCc)$/ ) {
            my ( $code, $msg ) = $Ticket->AddWatcher(
                Type  => $1,
                Email => $ARGSRef->{$key}
            );
            push @results, $msg;
        }

        # Add new  watchers by owner
        elsif ( $key =~ /^Ticket-AddWatcher-Principal-(\d*)$/ ) {
            my $principal_id = $1;
            my $form         = $ARGSRef->{$key};
            foreach my $value ( ref($form) ? @{$form} : ($form) ) {
                next unless $value =~ /^(?:AdminCc|Cc|Requestor)$/i;

                my ( $code, $msg ) = $Ticket->AddWatcher(
                    Type        => $value,
                    PrincipalId => $principal_id
                );
                push @results, $msg;
            }
        }

    }
    return (@results);
}



=head2 ProcessTicketDates ( TicketObj => $Ticket, ARGSRef => \%ARGS );

Returns an array of results messages.

=cut

sub ProcessTicketDates {
    my %args = (
        TicketObj => undef,
        ARGSRef   => undef,
        @_
    );

    my $Ticket  = $args{'TicketObj'};
    my $ARGSRef = $args{'ARGSRef'};

    my (@results);

    # Set date fields
    my @date_fields = qw(
        Told
        Resolved
        Starts
        Started
        Due
    );

    #Run through each field in this list. update the value if apropriate
    foreach my $field (@date_fields) {
        next unless exists $ARGSRef->{ $field . '_Date' };
        next if $ARGSRef->{ $field . '_Date' } eq '';

        my ( $code, $msg );

        my $DateObj = RT::Date->new( $session{'CurrentUser'} );
        $DateObj->Set(
            Format => 'unknown',
            Value  => $ARGSRef->{ $field . '_Date' }
        );

        my $obj = $field . "Obj";
        if (    ( defined $DateObj->Unix )
            and ( $DateObj->Unix != $Ticket->$obj()->Unix() ) )
        {
            my $method = "Set$field";
            my ( $code, $msg ) = $Ticket->$method( $DateObj->ISO );
            push @results, "$msg";
        }
    }

    # }}}
    return (@results);
}



=head2 ProcessTicketLinks ( TicketObj => $Ticket, ARGSRef => \%ARGS );

Returns an array of results messages.

=cut

sub ProcessTicketLinks {
    my %args = (
        TicketObj => undef,
        ARGSRef   => undef,
        @_
    );

    my $Ticket  = $args{'TicketObj'};
    my $ARGSRef = $args{'ARGSRef'};

    my (@results) = ProcessRecordLinks( RecordObj => $Ticket, ARGSRef => $ARGSRef );

    #Merge if we need to
    if ( $ARGSRef->{ $Ticket->Id . "-MergeInto" } ) {
        $ARGSRef->{ $Ticket->Id . "-MergeInto" } =~ s/\s+//g;
        my ( $val, $msg ) = $Ticket->MergeInto( $ARGSRef->{ $Ticket->Id . "-MergeInto" } );
        push @results, $msg;
    }

    return (@results);
}


sub ProcessRecordLinks {
    my %args = (
        RecordObj => undef,
        ARGSRef   => undef,
        @_
    );

    my $Record  = $args{'RecordObj'};
    my $ARGSRef = $args{'ARGSRef'};

    my (@results);

    # Delete links that are gone gone gone.
    foreach my $arg ( keys %$ARGSRef ) {
        if ( $arg =~ /DeleteLink-(.*?)-(DependsOn|MemberOf|RefersTo)-(.*)$/ ) {
            my $base   = $1;
            my $type   = $2;
            my $target = $3;

            my ( $val, $msg ) = $Record->DeleteLink(
                Base   => $base,
                Type   => $type,
                Target => $target
            );

            push @results, $msg;

        }

    }

    my @linktypes = qw( DependsOn MemberOf RefersTo );

    foreach my $linktype (@linktypes) {
        if ( $ARGSRef->{ $Record->Id . "-$linktype" } ) {
            $ARGSRef->{ $Record->Id . "-$linktype" } = join( ' ', @{ $ARGSRef->{ $Record->Id . "-$linktype" } } )
                if ref( $ARGSRef->{ $Record->Id . "-$linktype" } );

            for my $luri ( split( / /, $ARGSRef->{ $Record->Id . "-$linktype" } ) ) {
                next unless $luri;
                $luri =~ s/\s+$//;    # Strip trailing whitespace
                my ( $val, $msg ) = $Record->AddLink(
                    Target => $luri,
                    Type   => $linktype
                );
                push @results, $msg;
            }
        }
        if ( $ARGSRef->{ "$linktype-" . $Record->Id } ) {
            $ARGSRef->{ "$linktype-" . $Record->Id } = join( ' ', @{ $ARGSRef->{ "$linktype-" . $Record->Id } } )
                if ref( $ARGSRef->{ "$linktype-" . $Record->Id } );

            for my $luri ( split( / /, $ARGSRef->{ "$linktype-" . $Record->Id } ) ) {
                next unless $luri;
                my ( $val, $msg ) = $Record->AddLink(
                    Base => $luri,
                    Type => $linktype
                );

                push @results, $msg;
            }
        }
    }

    return (@results);
}

=head2 _UploadedFile ( $arg );

Takes a CGI parameter name; if a file is uploaded under that name,
return a hash reference suitable for AddCustomFieldValue's use:
C<( Value => $filename, LargeContent => $content, ContentType => $type )>.

Returns C<undef> if no files were uploaded in the C<$arg> field.

=cut

sub _UploadedFile {
    my $arg         = shift;
    my $cgi_object  = $m->cgi_object;
    my $fh          = $cgi_object->upload($arg) or return undef;
    my $upload_info = $cgi_object->uploadInfo($fh);

    my $filename = "$fh";
    $filename =~ s#^.*[\\/]##;
    binmode($fh);

    return {
        Value        => $filename,
        LargeContent => do { local $/; scalar <$fh> },
        ContentType  => $upload_info->{'Content-Type'},
    };
}

sub GetColumnMapEntry {
    my %args = ( Map => {}, Name => '', Attribute => undef, @_ );

    # deal with the simplest thing first
    if ( $args{'Map'}{ $args{'Name'} } ) {
        return $args{'Map'}{ $args{'Name'} }{ $args{'Attribute'} };
    }

    # complex things
    elsif ( my ( $mainkey, $subkey ) = $args{'Name'} =~ /^(.*?)\.{(.+)}$/ ) {
        return undef unless $args{'Map'}->{$mainkey};
        return $args{'Map'}{$mainkey}{ $args{'Attribute'} }
            unless ref $args{'Map'}{$mainkey}{ $args{'Attribute'} } eq 'CODE';

        return sub { $args{'Map'}{$mainkey}{ $args{'Attribute'} }->( @_, $subkey ) };
    }
    return undef;
}

sub ProcessColumnMapValue {
    my $value = shift;
    my %args = ( Arguments => [], Escape => 1, @_ );

    if ( ref $value ) {
        if ( UNIVERSAL::isa( $value, 'CODE' ) ) {
            my @tmp = $value->( @{ $args{'Arguments'} } );
            return ProcessColumnMapValue( ( @tmp > 1 ? \@tmp : $tmp[0] ), %args );
        } elsif ( UNIVERSAL::isa( $value, 'ARRAY' ) ) {
            return join '', map ProcessColumnMapValue( $_, %args ), @$value;
        } elsif ( UNIVERSAL::isa( $value, 'SCALAR' ) ) {
            return $$value;
        }
    }

    return $m->interp->apply_escapes( $value, 'h' ) if $args{'Escape'};
    return $value;
}

=head2 GetPrincipalsMap OBJECT, CATEGORIES

Returns an array suitable for passing to /Admin/Elements/EditRights with the
principal collections mapped from the categories given.

=cut

sub GetPrincipalsMap {
    my $object = shift;
    my @map;
    for (@_) {
        if (/System/) {
            my $system = RT::Groups->new($session{'CurrentUser'});
            $system->LimitToSystemInternalGroups();
            $system->OrderBy( FIELD => 'Type', ORDER => 'ASC' );
            push @map, [
                'System' => $system,    # loc_left_pair
                'Type'   => 1,
            ];
        }
        elsif (/Groups/) {
            my $groups = RT::Groups->new($session{'CurrentUser'});
            $groups->LimitToUserDefinedGroups();
            $groups->OrderBy( FIELD => 'Name', ORDER => 'ASC' );

            # Only show groups who have rights granted on this object
            $groups->WithGroupRight(
                Right   => '',
                Object  => $object,
                IncludeSystemRights => 0,
                IncludeSubgroupMembers => 0,
            );

            push @map, [
                'User Groups' => $groups,   # loc_left_pair
                'Name'        => 0
            ];
        }
        elsif (/Roles/) {
            my $roles = RT::Groups->new($session{'CurrentUser'});

            if ($object->isa('RT::System')) {
                $roles->LimitToRolesForSystem();
            }
            elsif ($object->isa('RT::Queue')) {
                $roles->LimitToRolesForQueue($object->Id);
            }
            else {
                $RT::Logger->warn("Skipping unknown object type ($object) for Role principals");
                next;
            }
            $roles->OrderBy( FIELD => 'Type', ORDER => 'ASC' );
            push @map, [
                'Roles' => $roles,  # loc_left_pair
                'Type'  => 1
            ];
        }
        elsif (/Users/) {
            my $Users = RT->PrivilegedUsers->UserMembersObj();
            $Users->OrderBy( FIELD => 'Name', ORDER => 'ASC' );

            # Only show users who have rights granted on this object
            my $group_members = $Users->WhoHaveGroupRight(
                Right   => '',
                Object  => $object,
                IncludeSystemRights => 0,
                IncludeSubgroupMembers => 0,
            );

            # Limit to UserEquiv groups
            my $groups = $Users->NewAlias('Groups');
            $Users->Join(
                ALIAS1 => $groups,
                FIELD1 => 'id',
                ALIAS2 => $group_members,
                FIELD2 => 'GroupId'
            );
            $Users->Limit( ALIAS => $groups, FIELD => 'Domain', VALUE => 'ACLEquivalence' );
            $Users->Limit( ALIAS => $groups, FIELD => 'Type', VALUE => 'UserEquiv' );


            my $display = sub {
                $m->scomp('/Elements/ShowUser', User => $_[0], NoEscape => 1)
            };
            push @map, [
                'Users' => $Users,  # loc_left_pair
                $display => 0
            ];
        }
    }
    return @map;
}

=head2 _load_container_object ( $type, $id );

Instantiate container object for saving searches.

=cut

sub _load_container_object {
    my ( $obj_type, $obj_id ) = @_;
    return RT::SavedSearch->new( $session{'CurrentUser'} )->_load_privacy_object( $obj_type, $obj_id );
}

=head2 _parse_saved_search ( $arg );

Given a serialization string for saved search, and returns the
container object and the search id.

=cut

sub _parse_saved_search {
    my $spec = shift;
    return unless $spec;
    if ( $spec !~ /^(.*?)-(\d+)-SavedSearch-(\d+)$/ ) {
        return;
    }
    my $obj_type  = $1;
    my $obj_id    = $2;
    my $search_id = $3;

    return ( _load_container_object( $obj_type, $obj_id ), $search_id );
}

=head2 ScrubHTML content

Removes unsafe and undesired HTML from the passed content

=cut

my $SCRUBBER;
sub ScrubHTML {
    my $Content = shift;
    $SCRUBBER = _NewScrubber() unless $SCRUBBER;

    $Content = '' if !defined($Content);
    return $SCRUBBER->scrub($Content);
}

=head2 _NewScrubber

Returns a new L<HTML::Scrubber> object.

If you need to be more lax about what HTML tags and attributes are allowed,
create C</opt/rt4/local/lib/RT/Interface/Web_Local.pm> with something like the
following:

    package HTML::Mason::Commands;
    # Let tables through
    push @SCRUBBER_ALLOWED_TAGS, qw(TABLE THEAD TBODY TFOOT TR TD TH);
    1;

=cut

our @SCRUBBER_ALLOWED_TAGS = qw(
    A B U P BR I HR BR SMALL EM FONT SPAN STRONG SUB SUP STRIKE H1 H2 H3 H4 H5
    H6 DIV UL OL LI DL DT DD PRE BLOCKQUOTE BDO
);

our %SCRUBBER_ALLOWED_ATTRIBUTES = (
    # Match http, ftp and relative urls
    # XXX: we also scrub format strings with this module then allow simple config options
    href   => qr{^(?:http:|ftp:|https:|/|__Web(?:Path|BaseURL|URL)__)}i,
    face   => 1,
    size   => 1,
    target => 1,
    style  => qr{
        ^(?:\s*
            (?:(?:background-)?color: \s*
                    (?:rgb\(\s* \d+, \s* \d+, \s* \d+ \s*\) |   # rgb(d,d,d)
                       \#[a-f0-9]{3,6}                      |   # #fff or #ffffff
                       [\w\-]+                                  # green, light-blue, etc.
                       )                            |
               text-align: \s* \w+                  |
               font-size: \s* [\w.\-]+              |
               font-family: \s* [\w\s"',.\-]+       |
               font-weight: \s* [\w\-]+             |

               # MS Office styles, which are probably fine.  If we don't, then any
               # associated styles in the same attribute get stripped.
               mso-[\w\-]+?: \s* [\w\s"',.\-]+
            )\s* ;? \s*)
         +$ # one or more of these allowed properties from here 'till sunset
    }ix,
    dir    => qr/^(rtl|ltr)$/i,
    lang   => qr/^\w+(-\w+)?$/,
);

our %SCRUBBER_RULES = ();

sub _NewScrubber {
    require HTML::Scrubber;
    my $scrubber = HTML::Scrubber->new();
    $scrubber->default(
        0,
        {
            %SCRUBBER_ALLOWED_ATTRIBUTES,
            '*' => 0, # require attributes be explicitly allowed
        },
    );
    $scrubber->deny(qw[*]);
    $scrubber->allow(@SCRUBBER_ALLOWED_TAGS);
    $scrubber->rules(%SCRUBBER_RULES);

    # Scrubbing comments is vital since IE conditional comments can contain
    # arbitrary HTML and we'd pass it right on through.
    $scrubber->comment(0);

    return $scrubber;
}

=head2 JSON

Redispatches to L<RT::Interface::Web/EncodeJSON>

=cut

sub JSON {
    RT::Interface::Web::EncodeJSON(@_);
}

package RT::Interface::Web;
RT::Base->_ImportOverlays();

1;