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Diff for /rat/lonsequence.pm between versions 1.2 and 1.48.2.4.2.1

-version 1.2, 2000/10/16 21:09:33
+version 1.48.2.4.2.1, 2023/01/20 23:49:50
  Line 2
  #
  # Sequence Handler
  #
- # (Handler to resolve ambiguous file locations
+ # $Id$
  #
- # (TeX Content Handler
+ # Copyright Michigan State University Board of Trustees
  #
- # 05/29/00,05/30,10/11 Gerd Kortemeyer)
+ # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
  #
- # 10/11,10/12 Gerd Kortemeyer)
+ # 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.
  #
- # 10/16 Gerd Kortemeyer
+ # 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::lonambiguous;
+ package Apache::lonsequence;
  use strict;
  use Apache::lonnet;
- use Apache::Constants qw(:common REDIRECT);
+ use Apache::Constants qw(:common :http REDIRECT);
  use GDBM_File;
+ use LONCAPA::map();
+ use LONCAPA;
+ use Apache::lonpageflip();
+ use Apache::loncommon();
+ use Apache::groupsort();
+ use Apache::lonlocal;
+ use Apache::lonnavmaps();
+ use Apache::lonenc();
+ use HTML::Entities();
+ my %selhash;
+ my $successtied;
+ # ----------------------------------------- Attempt to read from resource space
+ sub attemptread {
+     my ($fn,$unsorted)=@_;
+     &Apache::lonnet::repcopy($fn);
+     if (-e $fn) {
+ 	return &LONCAPA::map::attemptread($fn,$unsorted);
+     } else {
+         return ();
+     }
+ }
+ sub mapread {
+     my $fn=shift;
+     &Apache::lonnet::repcopy($fn);
+     if (-e $fn) {
+ 	return &LONCAPA::map::mapread($fn,'');
+     } else {
+         return ();
+     }
+ }
+ # ---------------------------------------------------------------- View Handler
- # ----------------------------------------------------------- Could not resolve
+ sub viewmap {
+     my ($r,$url)=@_;
- sub getlost {
+     my $js;
-     my ($r,$errmsg)=@_;
+     if ($env{'form.forceselect'}) {
-     $r->content_type('text/html');
+ 	$js = (<<ENDSCRIPT);
-     $r->send_http_header;
+ <script type="text/javascript">
-     $r->print(
-  '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
+ function select_group() {
-  'LON-CAPA</h1>Could not handle ambiguous resource reference.<p>'.$errmsg.
+     window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
-  '</body></html>');
+ }
+ function queue(val) {
+     if (eval("document.forms."+val+".filelink.checked")) {
+ 	var l=val.length;
+ 	var v=val.substring(4,l);
+ 	document.forms.fileattr.acts.value+='1a'+v+'b';
+     }
+     else {
+ 	var l=val.length;
+ 	var v=val.substring(4,l);
+ 	document.forms.fileattr.acts.value+='0a'+v+'b';
+     }
  }
+ </script>
+ ENDSCRIPT
+     }
+     $r->print(&Apache::loncommon::start_page('Map Contents',$js).
+ 	      '<h1>'.$url.'</h1>');
+ # ------------------ This is trying to select. Provide buttons and tie %selhash
+     if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
+ <form name="fileattr"><input type="hidden" name="acts" value="" />
+ <input type="button" name="close" value="CLOSE" onClick="self.close()" />
+ <input type="button" name="groupimport" value="GROUP IMPORT"
+ onClick="javascript:select_group()" />
+ </form>
+ ENDSELECT
+     my $diropendb =
+   LONCAPA::tempdir() .
+     "$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
+         if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
+ 	    if ($env{'form.launch'} eq '1') {
+ 	       &start_fresh_session();
+ 	    }
+             $successtied=1;
+ # - Evaluate actions from previous page (both cumulatively and chronologically)
+ 	    if ($env{'form.catalogmode'} eq 'import') {
+ 		&Apache::groupsort::update_actions_hash(\%selhash);
+ 	    }
+ # -
+         }
+     }
+ # ----------------------------- successtied is now '1' if in working selectmode
+     my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
+     if ($fatal==1) {
+        $r->print('<p class="LC_warning">'
+                 .&mt('Map contents are not shown in order.')
+                 .'</p><br />');
+     }
+     my $idx=0;
+     foreach my $entry (&attemptread(&Apache::lonnet::filelocation('',$url))) {
+ 	if (defined($entry)) {
+             $idx++;
+             if ($successtied) {
+ 		$r->print('<form name="form'.$idx.'">');
+             }
+ 	    my ($title,$url)=split(/\:/,$entry);
+ 	    $title = &LONCAPA::map::qtescape($title);
+ 	    unless ($title) { $title=(split(/\//,$url))[-1] };
+             my $enc_title = &HTML::Entities::encode($title,'\'"<>&');
+ 	    unless ($title) {
+ 		$title='<i>'.&mt('Empty').'</i>';
+ 		$enc_title = &mt('Empty');
+ 	    }
+ 	    $url  = &LONCAPA::map::qtescape($url);
+             my $enc_url = &HTML::Entities::encode($url,'\'"<>&');
+             if ($url) {
+ 		if ($successtied) {
+ 		    my $checked='';
+ 	           if ($selhash{'store_'.$url}) {
+ 	       	      $checked=' checked="checked"';
+ 	           }
+ 	           $selhash{"pre_${idx}_link"}=$url;
+ 	           $selhash{"pre_${idx}_title"}=$title;
+ 		    $url  = &HTML::Entities::encode($url, '\'"<>&');
+ 		    $r->print(<<ENDCHECKBOX);
+ <input type='checkbox' name='filelink'
+ value='$enc_url' onClick='javascript:queue("form$idx")'$checked />
+ <input type='hidden' name='title' value='$enc_title' />
+ ENDCHECKBOX
+                 }
+ 		$r->print('<a href="'.$enc_url.'">');
+             }
+             $r->print($enc_title);
+             if ($url) { $r->print('</a>'); }
+             if ($successtied) {
+ 		$r->print('</form>');
+             } else {
+ 		$r->print('<br />');
+             }
+         }
+     }
+     $r->print(&Apache::loncommon::end_page());
+     if ($successtied) {
+ 	untie %selhash;
+     }
+ }
+ # ----------------------------------------------------------- Clean out selhash
+ sub start_fresh_session {
+     foreach my $item (keys(%selhash)) {
+ 	if ($item =~ /^pre_/) {
+ 	    delete $selhash{$item};
+ 	}
+ 	if ($item =~ /^store/) {
+ 	    delete $selhash{$item};
+ 	}
+     }
+ }
  # ================================================================ Main Handler
  sub handler {
     my $r=shift;
     if ($r->header_only) {
-       $r->content_type('text/html');
+       &Apache::loncommon::content_type($r,'text/html');
        $r->send_http_header;
        return OK;
     }
+    my $requrl=$r->uri;
+    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+                                           ['forceselect','launch','navmap']);
+    if (($env{'request.course.fn'}) && ($env{'form.navmap'}) && ($env{'request.course.id'})) {
+        my $crstype = &Apache::loncommon::course_type();
+        unless (($crstype eq 'Placement') && (!$env{'request.role.adv'})) {
+            # Check for critical messages and redirect if present.
+            my ($redirect,$url) = &Apache::loncommon::critical_redirect(300,'contents');
+            if ($redirect) {
+                &Apache::loncommon::content_type($r,'text/html');
+                $r->header_out(Location => $url);
+                return REDIRECT;
+            }
+            # Check if course needs to be re-initialized
+            my $loncaparev = $r->dir_config('lonVersion');
+            my ($result,@reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
+            if ($result eq 'switch') {
+                &Apache::loncommon::content_type($r,'text/html');
+                $r->send_http_header;
+                $r->print(&Apache::loncommon::check_release_result(@reinit));
+                return OK;
+            }
+            my ($cnum,$cdom);
+            if ($result) {
+                $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+                $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+            }
+            if (($result eq 'main') || ($result eq 'both')) {
+                my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
+                if ($ferr) {
+                    my $requrl = $r->uri;
+                    $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
+                    $env{'user.reinit'} = 1;
+                    return HTTP_NOT_ACCEPTABLE;
+                }
+            }
+            if (($result eq 'both') || ($result eq 'supp')) {
+                my $possdel;
+                if ($result eq 'supp') {
+                    $possdel = 1;
+                }
+                my ($supplemental,$refs_updated) = &Apache::loncommon::get_supplemental($cnum,$cdom,'',$possdel);
+                unless ($refs_updated) {
+                    &Apache::loncommon::set_supp_httprefs($cnum,$cdom,$supplemental,$possdel);
+                }
+            }
+            &Apache::loncommon::content_type($r,'text/html');
+            $r->send_http_header;
+            my $mapurl = &Apache::lonnet::declutter($requrl);
+            my $maptitle = &Apache::lonnet::gettitle($mapurl);
+            my @crumbs = ({text => $maptitle, no_mt => 1});
+            my $args = {'bread_crumbs' => \@crumbs,
+                        'bread_crumbs_nomenu' => 1};
+            # Create the nav map
+            my $navmap = Apache::lonnavmaps::navmap->new();
+            if (ref($navmap)) {
+                # renderer call
+                if (&Apache::lonnet::is_on_map($requrl)) {
+                    @crumbs = ({text  => $crstype.' Contents',
+                                href  => "javascript:gopost('/adm/navmaps','')"});
+                    my $res = $navmap->getResourceByUrl($mapurl);
+                    if (ref($res)) {
+                        my $symb = $res->symb();
+                        if ($symb) {
+                            my ($parent) = &Apache::lonnet::decode_symb($res->symb());
+                            if ($parent ne $env{'course.'.$env{'request.course.id'}.'.url'}) {
+                                my @mapcrumbs = $navmap->recursed_crumbs($parent);
+                                if (@mapcrumbs) {
+                                    push(@crumbs,@mapcrumbs);
+                                }
+                            }
+                            $env{'request.symb'} = $symb;
+                        }
+                    }
+                    push(@crumbs,{text => $maptitle, no_mt => 1});
+                    $args = {'bread_crumbs' => \@crumbs,
+                             'bread_crumbs_nomenu' => 1,
+                             'no_auto_mt_title' => 1};
+                    $r->print(&Apache::loncommon::start_page($maptitle,undef,$args));
+                    my $renderArgs = { 'cols'                    => [0,1,2,3],
+                                       'url'                     => $mapurl,
+                                       'navmap'                  => $navmap,
+                                       'suppressNavmap'          => 1,
+                                       'suppressEmptySequences'  => 1,
+                                       'filterFunc'              => undef,
+                                       'resource_no_folder_link' => 1,
+                                       'r'                       => $r,
+                                       'caller'                  => 'sequence',
+                                       'notools'                 => 1,
+                                       'iterator_map'            => $mapurl,
+                                     };
+                    my $render = &Apache::lonnavmaps::render($renderArgs);
+                    # If no resources were found let the user know.
+                    if ($renderArgs->{'counter'} == 0) {
+                        $r->print('<p class="LC_info">'.
+                                  &mt('No items found in folder').
+                                  '</p>');
+                    }
+                    $r->print(&Apache::loncommon::end_page());
+                } else {
+                    $r->print(&Apache::loncommon::start_page($maptitle,undef,$args).
+                              '<p class="LC_info">'.
+                              &mt('Folder no longer appears to be a part of the course').
+                              '</p>'.
+                              &Apache::loncommon::end_page());
+                }
+            } else {
+                $r->print(&Apache::loncommon::start_page($maptitle,undef,$args).
+                          '<p class="LC_warning">'.
+                          &mt('Error: could not determine contents of folder').
+                          '</p>'.
+                          &Apache::loncommon::end_page());
+            }
+            $r->rflush();
+            return OK;
+        }
+    }
     my %hash;
     my %bighash;
-    my $requrl=$r->uri;
- # ----------------------------------------------------------------- Tie db file
+    $successtied=0;
-   if ($ENV{'request.course.fn'}) {
+ # ------------------------------------------------------------ Tie symb db file
+   my $disurl='';
+   my $dismapid='';
+   my $exitdisid = '';
+   my $arrow_dir = '';
+   my $is_encrypted = '';
+   if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
         my $last;
-        if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
+        if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
-                     &GDBM_READER,0640)) {
+                     &GDBM_READER(),0640)) {
  	   $last=$hash{'last_direction'};
             untie(%hash);
         }
-        if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
+        my $direction='';
-                     &GDBM_READER,0640)) {
+        my $prevmap='';
-            my $direction='';
+        if ($last) {
-            my $prevmap='';
+ 	   ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
- 	   if ($last) {
- 	       ($prevmap,$direction)=(split(/\_\_\_/,$last));
-            }
- # ===== Stuff goes here
-           foreach $envkey (keys %ENV) {
-              if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
- 	         my $mapid=$1;
-                  my $resid=$2;
-                  my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
-                  &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
- 				           $resurl => $resid);
-                  $r->header_out(Location =>
-                                 'http://'.$ENV{'HTTP_HOST'}.$resurl);
-                  return REDIRECT;
-              }
- 	  }
-           untie(%bighash);
-        } else {
-           &getlost($r,'Could not access course structure.');
-           return OK;
         }
-    } else {
+ # ------------------------------------------------------------- Tie big db file
-       $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
+        if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
-       return HTTP_NOT_ACCEPTABLE;
+                     &GDBM_READER(),0640)) {
-    }
+ 	   my $disid='';
+            my $randomout ='';
-    return OK;
+            if ($direction eq 'back') {
+ 	       $disid=$bighash{'map_finish_'.$requrl};
+            } else {
+                $disid=$bighash{'map_start_'.$requrl};
+            }
+            if ($disid) {
+ 	       $disurl=$bighash{'src_'.$disid};
+                $dismapid=(split(/\./,$disid))[1];
+ 	       if (!$env{'request.role.adv'}) {
+ 		   $randomout = $bighash{'randomout_'.$disid};
+                    $is_encrypted = $bighash{'encrypted_'.$disid};
+                }
+            } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
+                     &GDBM_READER(),0640)) {
+                $last=$hash{'last_known'};
+                untie(%hash);
+            }
- # ================================================================= TRASH BELOW
- # ---------------------------------------------------------- Do we have a case?
+ # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
+            while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
+ 	       $direction=($direction?$direction:'forward');
+                ($disid,$requrl)=
+                          &Apache::lonpageflip::fullmove($disid,
+                            &Apache::lonnet::declutter($requrl),$direction);
+                if ($disid) {
+ 	           $disurl=$bighash{'src_'.$disid};
+                    $dismapid=(split(/\./,$disid))[1];
+ 		   if (!$env{'request.role.adv'}) {
+ 		       $randomout = $bighash{'randomout_'.$disid};
+                        $is_encrypted = $bighash{'encrypted_'.$disid};
+                    }
+                }
+  	   }
+            $exitdisid = $disid;
+            $arrow_dir = $direction;
-    my $thisfn;
+ # --------------------------------------- Untie hash, make sure to come by here
-    unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) {
+            untie(%bighash);
-        &getlost($r,'Could not find information on resource.');
+        }
-        return OK;
     }
- # ---------------------------------- Should this file have been part of a page?
-     $thisfn=&Apache::lonnet::declutter($thisfn);
+ # now either disurl is set (going to first page), or we need another display
-     my %hash;
+    if ($disurl) {
-     my $syval='';
+ # -------------------------------------------------- Has first or last resource
+       my $showdisurl = $disurl;
-     if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
+       if ($is_encrypted) {
-                   &GDBM_READER,0640)) {
+           $showdisurl = &Apache::lonenc::encrypted($disurl);
-        $syval=$hash{$thisfn};
+       }
-        untie(%hash);
+       if ($disurl =~ m{^/adm/navmaps(\?|$)}) {
-     }
+           &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid]);
+       } else {
- # ---------------------------------------------------------- There was an entry
+           &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
+                                     'last_known' => [$disurl,$dismapid]);
-     if ($syval) {
+       }
+       &Apache::loncommon::content_type($r,'text/html');
-        if ($syval=~/\_$/) {
+       $r->header_out(Location => &Apache::lonnet::absolute_url().
- # ----------------------------------- Okay, this should have appeared on a page
+                                  $showdisurl);
- 	   $syval=~s/\_\_\_$//;
+       return REDIRECT;
-  	   $r->content_type('text/html');
+    } else {
-            $r->header_out(Location =>
+        &Apache::loncommon::content_type($r,'text/html');
-                 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval);
+        $r->send_http_header;
-            return REDIRECT;
+        if ($exitdisid eq '' && $arrow_dir ne '') {
+            my %lt =&Apache::lonlocal::texthash(
+                    'nere' => 'Next resource could not be displayed',
+                    'goba' => 'Go Back',
+                    'nacc' => 'Course Contents',
+                           );
+            if (&Apache::loncommon::course_type() eq 'Community') {
+                $lt{'nav'} = &mt('Community Contents');
+            }
+            my $warnmsg;
+            if ($arrow_dir eq 'forward') {
+                $warnmsg = &mt('As all folders and sequences '
+                              .'following the current resource were empty, '
+                              .'you have now reached the end of the course.');
+            } elsif ($arrow_dir eq 'back') {
+                $warnmsg = &mt('As all folders and sequences '
+                              .'preceding the current resource were empty, '
+                              .'you have now reached the beginning of the course.');
+            }
+            my $start_page=
+ 	       &Apache::loncommon::start_page('Empty Folder/Sequence');
+            my $end_page=
+ 	       &Apache::loncommon::end_page();
+            $r->print(<<ENDNONE);
+ $start_page
+ <h3>$lt{'nere'}</h3>
+ <p>$warnmsg</p>
+ <ul>
+   <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
+   <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
+ </ul>
+ $end_page
+ ENDNONE
         } else {
- #  There is not really a problem (???), but cannot go back without endless loop
+            &viewmap($r,$requrl);
-            &getlost($r,'The nature of the problem is unclear');
-            return OK;
         }
-     }
+        return OK;
+    }
- # ------------------------------------------------ Would be standalone resource
-    if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
-                     &GDBM_READER,0640)) {
- # ---------------------------------------------- Get ID(s) for current resource
-       my $ids=$bighash{'ids_/res/'.$thisfn};
-       if ($ids) {
- # ------------------------------------------------------------------- Has ID(s)
-          my @possibilities=split(/\,/,$ids);
-          my $couldbe='';
-          map {
-              if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) {
- 	         if ($couldbe) {
- 		     $couldbe.=','.$_;
-                  } else {
-                      $couldbe=$_;
-                  }
-              }
- 	 } @possibilities;
-          if ($couldbe) {
-             @possibilities=split(/\,/,$couldbe);
-             if ($#possibilities>0) {
- # ----------------------------------------------- Okay, really multiple choices
-                $r->content_type('text/html');
-                $r->send_http_header;
-                $r->print(<<ENDSTART);
- <head><title>Choose Location</title></head>
- <body bgcolor="#FFFFFF">
- <h1>LON-CAPA</h1>
- The resource you had been accessing appears more than once in this course,
- and LON-CAPA has insufficient session information to determine which instance
- of the resource you meant.
- <p>
- Please click on the instance of the resource you intended to access:
- <p>
- <form action="/adm/ambiguous" method=post>
- <input type=hidden name=orgurl value="$thisfn">
- <input type=hidden name=selecturl value=1>
- <table border=2>
- <tr><th>&nbsp;</th><th>Title</th><th>Type</th><th>Part of ...</th></tr>
- ENDSTART
-                map {
-                    my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
-                    $r->print('<tr><td><input type=submit value=Select name="'.
-                               $_.'"></td><td>'.$bighash{'title_'.$_}.
-                               '</td><td>'.$bighash{'type_'.$_}.
-                               '</td><td><a href="'.$mapurl.'">'.$mapurl.
- 			      '</a></td></tr>');
-                } @possibilities;
-                $r->print('</table></form></body></html>');
- 	       untie(%bighash);
-                return OK;
-             }
-          }
-       }
-       untie(%bighash);
-   }
- # ------------------------------------ This handler should not have been called
-    &getlost($r,'Invalid call of handler');
-    return OK;
  }
 ;
  __END__
+ =head1 NAME
+ Apache::lonsequence
+ =head1 SYNOPSIS
+ Handler for showing sequence objects of
+ educational resources.
+ This is part of the LearningOnline Network with CAPA project
+ described at http://www.lon-capa.org.
+ =head1 SUBROUTINES
+ =over
+ =item handler()
+ =item viewmap()
+ =item attemptread()
+ =item mapread()
+ =item start_fresh_session()
+ =back
+ =cut

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Removed from v.1.2
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	Added in v.1.48.2.4.2.1