# The LearningOnline Network with CAPA
# Handler to show and edit custom distribution rights
#
# $Id: lonrights.pm,v 1.33 2011/11/14 00:20:31 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
#
###

package Apache::lonrights;

use strict;
use Apache::Constants qw(:common :http);
use Apache::lonnet;
use Apache::loncommon();
use HTML::LCParser;
use Apache::File;
use Apache::lonlocal;

sub handler {

  my $r=shift;
  my $target = $env{'form.grade_target'};
  if ($target eq 'meta') {
      &Apache::loncommon::content_type($r,'text/html');
      $r->send_http_header;
      $env{'request.uri'}=$r->uri;
      my $file = &Apache::lonnet::filelocation("",$r->uri);
      my $content=&Apache::lonnet::getfile($file);
      my $result=&Apache::lonxml::xmlparse(undef,'meta',$content);
      $r->print($result);
      return OK;
  }
  &Apache::loncommon::content_type($r,'text/html');
  $r->send_http_header;

  # Breadcrumbs
  &Apache::lonhtmlcommon::clear_breadcrumbs();
  &Apache::lonhtmlcommon::add_breadcrumb({
      'text'  => 'Construction Space',
      'href'  => &Apache::loncommon::authorspace($r->uri),
      });
  &Apache::lonhtmlcommon::add_breadcrumb({
      'text'  => 'Custom Rights Editor',
      'title' => 'Custom Distribution Rights Editor',
      'href'  => '',});

  my $js = &Apache::loncommon::coursebrowser_javascript().
      &Apache::loncommon::studentbrowser_javascript();
  # Breadcrumbs are included by &start_page
  $r->print(&Apache::loncommon::start_page('Custom Distribution Rights',$js)
           .&Apache::loncommon::head_subbox(
                &Apache::loncommon::CSTR_pageheader())
  );
  $r->rflush();

  my $uri=$r->uri;
  my $fn=&Apache::lonnet::filelocation('',$uri);
  my $contents='';
  my $constructmode=($uri=~ m{^/priv/});

# ============================================================ Modify and store
  if ($constructmode && $env{'form.store'}) {
      
      my @newrules;

# read rules from form
      foreach my $key (keys(%env)) {
	  next if ($key!~/^form\.effect\_(\d+)$/);
	  my $number=$1;
	  my %rulehash;
	  foreach my $action ('effect','type','domain','course','section','role') {
	      $rulehash{$action}=$env{'form.'.$action.'_'.$number};
	  }
	  if ($rulehash{'type'} !~ /^(user|course)$/) {
	      $rulehash{'type'} = 'course';
	  }
	  if ($rulehash{'type'} eq 'user') {
	      $rulehash{'section'}='';
	      $rulehash{'role'}='';
	  }
	  if ($rulehash{'role'} eq 'au') {
	      $rulehash{'course'}='';
	      $rulehash{'section'}='';
	  }
	  if ($rulehash{'role'} eq 'cc') {
	      $rulehash{'section'}='';
	  }
	  unless (($rulehash{'effect'} eq 'deny') ||
		  ($rulehash{'effect'} eq 'allow')) {
	      $rulehash{'effect'}='deny';
	  }
	  $rulehash{'domain'} = 
	      &LONCAPA::clean_domain($rulehash{'domain'});
	  if ($rulehash{'type'} eq 'course') {
	      $rulehash{'course'} = 
		  &LONCAPA::clean_courseid($rulehash{'course'});
	  } else {
	      $rulehash{'course'} = 
		  &LONCAPA::clean_username($rulehash{'course'});
	  }
	  $rulehash{'section'}=~s/\W//g;
	  if (!$rulehash{'domain'}) { 
	      $rulehash{'domain'}=$env{'user.domain'}; 
	  }
	  my $realm='';
	  my $separator = ($rulehash{'type'} eq 'course') ? '_' : '/';
	  if ($number) {
	      $realm=$rulehash{'domain'};
	      if ($rulehash{'course'}) {
		  $realm.=$separator.$rulehash{'course'};
	      }
	      if ($rulehash{'section'}) {
		  $realm.=$separator.$rulehash{'section'};
	      }
	  }
	  $newrules[$number]=$rulehash{'effect'}.':'.
	      $realm.':'.$rulehash{'role'}.':'.$rulehash{'type'};
      }
# edit actions?
      foreach my $key (keys(%env)) {
	  next if ($key!~/^form\.action\_(\d+)$/);
	  my $number=$1;
	  if ($env{$key} eq 'delete') { splice(@newrules,$number,1); }
	  if (($env{$key} eq 'moveup') && ($number>1)) {
	      @newrules[$number-1,$number] = @newrules[$number,$number-1];
	  }
	  if (($env{$key} eq 'movedown') && ($number<$#newrules)) {
	      @newrules[$number+1,$number] = @newrules[$number,$number+1];
	  }
	  if ($env{$key} eq 'insertabove') {
	      splice(@newrules,$number,0,'deny');
	  }
	  if ($env{$key} eq 'insertbelow') {
	      splice(@newrules,$number+1,0,'deny');
	  }
      }
      
# store file
      my $fh=Apache::File->new('>'.$fn);
      foreach (my $i=0;$i<=$#newrules;$i++) {
	  if ($newrules[$i]) {
	      my ($effect,$realm,$role,$type)=split(/\:/,$newrules[$i]);
	      print $fh
		  "<accessrule effect='$effect' realm='$realm' role='$role' type='$type' />\n";
	  }
      }
      $fh->close;
  }
# ============================================================ Read and display
  unless ($constructmode) { 
# =========================================== This is not in construction space
      $contents=&Apache::lonnet::getfile($fn);
      if ($contents==-1) { $contents=''; }
  } else {
# =============================================== This is in construction space
      if (-e $fn) {
	  my $fh=Apache::File->new($fn);
          $contents=join('',<$fh>);
          $fh->close();
      }
      $r->print('<form name="rules" method="post">');
  }
  unless ($contents=~/\<accessrule/s) {
      $contents='<accessrule effect="deny" />';
  }
  my $parser=HTML::LCParser->new(\$contents);
  my $token;
  my $rulecounter=0;
  my $colzero=&mt($constructmode?'Edit action':'Rule');
  my %lt=&Apache::lonlocal::texthash(
				     'ef' => 'Effect',
				     'ty' => 'Type',
				     'do' => 'Domain',
				     'co' => 'Course / User',
				     'se' => 'Section',
				     'ro' => 'Role');
# ---------------------------------------------------------- Start table output
  $r->print(&Apache::loncommon::start_data_table().
	    &Apache::loncommon::start_data_table_header_row().
	    "<th>$colzero</th><th>$lt{'ef'}</th><th>$lt{'ty'}</th><th>$lt{'do'}</th>".
	    "<th>$lt{'co'}</th><th>$lt{'se'}</th><th>$lt{'ro'}</th>".
	    &Apache::loncommon::end_data_table_header_row());
# --------------------------------------------------------------------- Default
# Fast forward to first rule
  $token=$parser->get_token;
  while ($token->[1] ne 'accessrule') { $token=$parser->get_token; }
# print default
  $r->print(&Apache::loncommon::start_data_table_row().'<td align="right">');
  if ($constructmode) {
     $r->print(&Apache::loncommon::select_form('','action_0',
                                  {'' => '',
                                   'insertbelow' => &mt('Insert rule below')}));
                                                
  } else {
      $r->print('&nbsp;');
  }
  $r->print('</td><td>');
  if ($constructmode) {
      my %lt = &Apache::lonlocal::texthash
                                   ('allow' => 'allow',
                                    'deny'  => 'deny');
      $r->print(&Apache::loncommon::select_form
                                 ($token->[2]->{'effect'},'effect_0',\%lt));
  } else {
      $r->print($token->[2]->{'effect'});
  }
  $r->print('</td><td colspan="5">'.&mt('Default'));
  if (($token->[2]->{'realm'}) || ($token->[2]->{'role'})) {
      $r->print(' - <span class="LC_error">'.&mt('Error! No default set.').
		'</span>');
  }
  $r->print('</td>'.&Apache::loncommon::end_data_table_row());
# Additional roles
  while ($token=$parser->get_token) {
      if (($token->[0] eq 'S') && ($token->[1] eq 'accessrule')) {
          $rulecounter++;
	  $r->print(&Apache::loncommon::start_data_table_row().
		     '<td align="right" rowspan="2">');
# insert, delete, etc
	  $r->print('<span class="LC_nobreak">'.$rulecounter.'. ');
          if ($constructmode) {
             my %lt = &Apache::lonlocal::texthash
                          ('' => '',
                           'delete' => 'Delete this rule',
                           'insertabove' => 'Insert rule above',
                           'insertbelow' => 'Insert rule below',
                           'moveup'      => 'Move rule up',
                           'movedown'    => 'Move rule down'
                           );

             $r->print(&Apache::loncommon::select_form(
                    '','action_'.$rulecounter,\%lt));
	  }
          $r->print('</span></td>'.
		    '<td rowspan="2">');
# effect
          if ($constructmode) {
             my %lt = &Apache::lonlocal::texthash
                             ('allow' => 'allow',
                              'deny'  => 'deny');
             $r->print(&Apache::loncommon::select_form
                                 ($token->[2]->{'effect'},
                                  'effect_'.$rulecounter,\%lt));
          } else {
             $r->print($token->[2]->{'effect'});
          }

# type
	  $r->print('</td><td rowspan="2">');
	  my $type = ($token->[2]{'type'} || 'course');
          if ($constructmode) {
              my %lt = &Apache::lonlocal::texthash
                           ('course' => 'Course',
                            'user'   => 'User');
              $r->print(&Apache::loncommon::select_form($type,
							'type_'.$rulecounter,\%lt));
          } else {
              $r->print($type);
          }

# ---- realm
          my $realm=$token->[2]->{'realm'};
          my ($rdom,$rcourse,$rsec);
	  if ($type eq 'course') {
	      ($rdom,$rcourse,$rsec) = split(m{[/_]},$realm,3);
	      $rcourse = &LONCAPA::clean_courseid($rcourse);
	  } else {
	      ($rdom,$rcourse,$rsec) = split(m{/},$realm,3);
	      $rcourse = &LONCAPA::clean_username($rcourse);
	  }
          $r->print('</td><td>');
# realm domain
          if ($constructmode) {
              unless ($rdom) { $rdom=$env{'user.domain'}; }
              $r->print(&Apache::loncommon::select_dom_form($rdom,
                                                      'domain_'.$rulecounter));
          } else {
              $r->print($rdom);
          }
          $r->print('</td><td>');
# realm course
          if ($constructmode) {
             $r->print('<input type="text" size="25" name="course_'.
                       $rulecounter.'" value="'.$rcourse.'" />');
          } else {
              $r->print($rcourse);
          }

          $r->print('</td><td rowspan="2">');
# realm section
	  if ($type eq 'course') {
	      if ($constructmode) {
		  $r->print('<input type="text" size="5" name="section_'.
			    $rulecounter.'" value="'.$rsec.'" />');
	      } else {
		  $r->print($rsec);
	      }
	  }

          $r->print('</td><td rowspan="2">');
# role
	  if ($type eq 'course') {
	      if ($constructmode) {
		  my %hash=('' => '');
		  foreach ('au','cc','in','ta','st') { 
		      $hash{$_}=&Apache::lonnet::plaintext($_); 
		  }
		  my $role=$token->[2]->{'role'};
		  unless ($role) { $role=''; }
		  $r->print(&Apache::loncommon::select_form(
							    $role,'role_'.$rulecounter,\%hash));
	      } else {
		  $r->print(&Apache::lonnet::plaintext($token->[2]->{'role'}));
	      }
	  }
# course selection link
          $r->print('</td>'.
		    &Apache::loncommon::end_data_table_row().
		    &Apache::loncommon::continue_data_table_row().
		    '<td colspan="2" align="right">');
	  if ($type eq 'course') {
	      if ($rcourse) {
		  my %descript=
		      &Apache::lonnet::coursedescription($rdom.'_'.$rcourse,
							 {'one_time' => 1});
		  $r->print($descript{'description'}.'&nbsp;&nbsp;&nbsp;');
	      }
	      if ($constructmode) {
		  $r->print(&Apache::loncommon::selectcourse_link('rules',
								  'course_'.$rulecounter,'domain_'.$rulecounter));
	      }
	  } else {
	      if ($rcourse) {
		  my $name = &Apache::loncommon::plainname($rcourse,$rdom);
		  $r->print($name.'&nbsp;&nbsp;&nbsp;');
	      }
	      if ($constructmode) {
		  $r->print(&Apache::loncommon::selectstudent_link('rules','course_'.$rulecounter,'domain_'.$rulecounter));
	      }
	  }
# close row
	  $r->print('</td>'.&Apache::loncommon::end_data_table_row());
     }                                       
  }
  $r->print(&Apache::loncommon::end_data_table());
# ------------------------------------------------------------ End table output
  if ($constructmode) { 
     $r->print('<input type="submit" name="store" value="'.&mt('Save').'" /></form>'); 
  }
  $r->print(&Apache::loncommon::end_page());
  return OK;  
}


1;
__END__