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corresponding to the name and class of an AceDB object to display.
The subroutine GetAceObject() will return the requested object, or
undef if the object does not exist.

To retrieve the parameters, use the CGI.pm param() method:

  $name  = param('name');
  $class = param('class');


=item search scripts

These are not called with any CGI parameters on their first
invocation, but can define their own parameter lists by creating
fill-out forms.  The AceBrowser system remembers the last search
performed by a search script in a cookie and regenerates the CGI
parameters the next time the user selects that search script.

=back

=head1 SUBROUTINES

The following sections describe the exported subroutines.

=over 4

=cut

use strict;
use Ace::Browser::SiteDefs;
use Ace 1.76;
use CGI qw(:standard escape);
use CGI::Cookie;
use File::Path 'mkpath';

use vars qw/@ISA @EXPORT @EXPORT_OK $VERSION %EXPORT_TAGS 
  %DB %OPEN $HEADER $TOP @COOKIES
  $APACHE_CONF/;

require Exporter;
@ISA = qw(Exporter);
$VERSION = 1.21;

######################### This is the list of exported subroutines #######################
@EXPORT = qw(
	     GetAceObject AceError AceNotFound AceMissing DoRedirect
	     OpenDatabase Object2URL Url
	     ObjectLink Configuration PrintTop PrintBottom);
@EXPORT_OK = qw(AceRedirect Toggle ResolveUrl AceInit AceAddCookie
		AceHeader TypeSelector Style AcePicRoot
		Header Footer DB_Name AceMultipleChoices);
%EXPORT_TAGS = ( );

use constant DEFAULT_DATABASE  => 'default';
use constant PRIVACY           => 'misc/privacy';  # privacy/cookie statement
use constant SEARCH_BROWSE     => 'search';   # a fallback search script
my %VALID;  # cache for get_symbolic() lookups

=item AceError($message)

This subroutine will print out an error message and exit the script.
The text of the message is taken from $message.

=cut

sub AceError {
    my $msg = shift;
    PrintTop(undef,undef,'Error');
    print CGI::font({-color=>'red'},$msg);
    PrintBottom();
    Apache->exit(0) if defined &Apache::exit;
    exit(0);
}

=item AceHeader()

This function prints the HTTP header and issues a number of cookies
used for maintaining AceBrowser state.  It is not exported by default.

=cut

=item AceAddCookie(@cookies)

This subroutine, which must be called b<after> OpenDatabase() and/or
GetAceObject() and b<before> PrintTop(), will add one or more cookies
to the outgoing HTTP headers that are emitted by AceHeader().  
Cookies must be CGI::Cookie objects.

=cut

sub AceAddCookie {
   push @COOKIES,@_;  # add caller's to our globals
}

################## canned header ############
sub AceHeader {

  my %searches = map {$_=>1} Configuration()->searches;
  my $quovadis = url(-relative=>1);

  my $db = get_symbolic();

  my $referer  = referer();
  $referer =~ s!^http://[^/]+!! if defined $referer;
  my $home = Configuration()->Home->[0] if Configuration()->Home;

  if ($referer && $home && index($referer,$home) >= 0) {
    my $bookmark = cookie(
			  -name=>"HOME_${db}",
			  -value=>$referer,
			  -path=>'/');
    push(@COOKIES,$bookmark);
  }

  if ($searches{$quovadis}) {
    Delete('Go');
    my $search_name = "SEARCH_${db}_${quovadis}";
    my $search_data = cookie(-name  => $search_name,
			     -value => query_string(),
			     -path=>'/',
			    );
    my $last_search = cookie(-name=>"ACEDB_$db",
			     -value=>$quovadis,
			     -path=>'/');
    push(@COOKIES,$search_data,$last_search);
  }

  print @COOKIES ? header(-cookie=>\@COOKIES,@_) : header(@_);

  @COOKIES = ();
  $HEADER++;
}

=item AceInit()

This subroutine initializes the AcePerl connection to the configured
database.  If the database cannot be opened, it generates an error
message and exits.  This subroutine is not exported by default, but is 
called by PrintTop() and Header() internally.

=cut

# Subroutines used by all scripts.
# Will generate an HTTP 'document not found' error if you try to get an 
# undefined database name.  Check the return code from this function and
# return immediately if not true (actually, not needed because we exit).
sub AceInit   {
  $HEADER   = 0;
  $TOP      = 0;
  @COOKIES  = ();

  # keeps track of what sections should be open
  %OPEN = param('open') ? map {$_ => 1} split(' ',param('open')) : () ;

  return 1 if Configuration();

  # if we get here, it is a big NOT FOUND error
  print header(-status=>'404 Not Found',-type=>'text/html');
  $HEADER++;
  print start_html(-title => 'Database Not Found',
		   -style => Ace::Browser::SiteDefs->getConfig(DEFAULT_DATABASE)->Style,
		  ),
        h1('Database not found'),
        p('The requested database',i(get_symbolic()),'is not recognized',
	  'by this server.');
  print p('Please return to the',a({-href=>referer()},'referring page.')) if referer();
  print end_html;
  Apache::exit(0) if defined &Apache::exit;  # bug out of here!
  exit(0);
}

=item AceMissing([$class,$name])

This subroutine will print out an error message indicating that an
object is present in AceDB, but that the information the user
requested is absent. It will then exit the script. This is
infrequently encountered when following XREFed objects. If the class
and name of the object are not provided as arguments, they are taken
from CGI's param() function.

=cut

sub AceMissing {
    my ($class,$name) = @_;
    $class ||= param('class');
    $name  ||= param('name');
    PrintTop(undef,undef,$name);
    print strong('There is no further information about this object in the database.');
    PrintBottom();
    Apache->exit(0) if defined &Apache::exit;
    exit(0);
}

=item AceMultipleChoices($symbol,$report,$objects)

This function is called when a search has recovered multiple objects
and the user must make a choice among them.  The user is presented
with an ordered list of the objects, and asked to click on one of
them.

The three arguements are:

   $symbol   The keyword or query string the user was searching
             on, undef if none.

   $report   The symbolic name of the current display, or undef
	     if none.

   $objects  An array reference containing the Ace objects in
	     question.

This subroutine is not exported by default.

=cut

sub AceMultipleChoices {
  my ($symbol,$report,$objects) = @_;
  if ($objects && @$objects == 1) {
    my $destination = Object2URL($objects->[0]);
    AceHeader(-Refresh => "1; URL=$destination");
    print start_html (
			   '-Title' => 'Redirect',
			   '-Style' => Style(),
			),
      h1('Redirect'),
      p("Automatically transforming this query into a request for corresponding object",
	ObjectLink($objects->[0],$objects->[0]->class.':'.$objects->[0])),
      p("Please wait..."),
      Footer(),
      end_html();
    return;
  }
  PrintTop(undef,undef,'Multiple Choices');
  print
    p("Multiple $report objects correspond to $symbol.",
      "Please choose one:"),
    ol(
       li([
	   map {ObjectLink($_,font({-color=>'red'},$_->class).': '.$_)} @$objects
	  ])
	    );
  PrintBottom();
}

=item AceNotFound([$class,$name])

This subroutine will print out an error message indicating that the
requested object is not present in AceDB, even as a name. It will then
exit the script. If the class and name of the object are not provided
as arguments, they are taken from CGI's param() function.

=cut

sub AceNotFound {
  my $class = shift || param('class');
  my $name  = shift || param('name');
  PrintTop(undef,undef,"$class: $name not found");
  print p(font({-color => 'red'},
	       strong("The $class named \"$name\" is not found in the database.")));
  PrintBottom();
  Apache->exit(0) if defined &Apache::exit;
  exit(0);
}

=item ($uri,$physical_path) = AcePicRoot($directory)

This function returns the physical and URL paths of a temporary
directory in which the pic script can write pictures.  Not exported by
default.  Returns a two-element list containing the URL and physical
path.

=cut

sub AcePicRoot {
  my $path = shift;
  my $umask = umask();
  umask 002;  # want this writable by group
  my ($picroot,$uri);
  if ($ENV{MOD_PERL} && Apache->can('request')) { # we have apache, so no reason not to take advantage of it
    my $r = Apache->request;
    $uri  = join('/',Configuration()->Pictures->[0],"/",$path);
    my $subr = $r->lookup_uri($uri);
    $picroot = $subr->filename if $subr;
  } else {
    ($uri,$picroot) = @{Configuration()->Pictures} if Configuration()->Pictures;
    $uri     .= "/$path";
    $picroot .= "/$path";
  }
  mkpath ($picroot,0,0777) || AceError("Can't create directory to store image in") unless -d $picroot;
  umask $umask;
  return ($uri,$picroot);
}


=item AceRedirect($report,$object)

This function redirects the user to a named display script for viewing 
an Ace object.  It is used, for example, to convert a request for a
sequence into a request for a protein:

  $obj = GetAceObject();
  if ($obj->CDS) {
    my $protein	= $obj->Corresponding_protein;
    AceRedirect('protein',$protein);
  }

AceRedirect must be called b<before> PrintTop() or  AceHeader().  It