Annotation of rat/lonpageflip.pm, revision 1.63

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Page flip handler
                      4: #
1.63    ! albertel    5: # $Id: lonpageflip.pm,v 1.62 2006/01/09 18:51:26 albertel Exp $
1.18      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
                     13: # the Free Software Foundation; either version 2 of the License, or
                     14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
                     23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
                     27: # http://www.lon-capa.org/
                     28: #
1.1       www        29: 
                     30: package Apache::lonpageflip;
                     31: 
                     32: use strict;
1.4       www        33: use Apache::Constants qw(:common :http REDIRECT);
1.53      albertel   34: use Apache::lonnet;
1.1       www        35: use HTML::TokeParser;
                     36: use GDBM_File;
                     37: 
1.3       www        38: # ========================================================== Module Global Hash
                     39:   
1.1       www        40: my %hash;
1.34      www        41: 
                     42: sub cleanup {
                     43:     if (tied(%hash)){
                     44: 	&Apache::lonnet::logthis('Cleanup pageflip: hash');
                     45:         unless (untie(%hash)) {
                     46: 	    &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
                     47:         }
                     48:     }
1.63    ! albertel   49:     return OK;
1.34      www        50: }
1.1       www        51: 
1.3       www        52: sub addrid {
1.4       www        53:     my ($current,$new,$condid)=@_;
                     54:     unless ($condid) { $condid=0; }
1.27      www        55: 
1.3       www        56: 	if ($current) {
1.5       www        57: 	    $current.=','.$new;
1.3       www        58:         } else {
1.5       www        59:             $current=''.$new;
1.3       www        60:         }
1.27      www        61: 
1.3       www        62:     return $current;
1.25      www        63: }
                     64: 
                     65: sub fullmove {
                     66:     my ($rid,$mapurl,$direction)=@_;
1.53      albertel   67:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel   68:                         &GDBM_READER(),0640)) {
1.25      www        69: 	($rid,$mapurl)=&move($rid,$mapurl,$direction);
                     70:         untie(%hash);
                     71:     }
                     72:     return($rid,$mapurl);
1.1       www        73: }
                     74: 
1.50      albertel   75: sub hash_src {
                     76:     my ($id)=@_;
1.56      albertel   77:     my ($mapid,$resid)=split(/\./,$id);
                     78:     my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                     79: 					  $resid,$hash{'src_'.$id});
1.50      albertel   80:     if ($hash{'encrypted_'.$id}) {
1.56      albertel   81: 	return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
                     82: 		&Apache::lonenc::encrypted($symb));
1.50      albertel   83:     }
1.56      albertel   84:     return ($hash{'src_'.$id},$symb);
1.50      albertel   85: }
                     86: 
1.15      www        87: sub move {
                     88:     my ($rid,$mapurl,$direction)=@_;
1.23      www        89:     my $startoutrid=$rid;
1.15      www        90: 
                     91:     my $next='';
                     92: 
                     93:               my $mincond=1;
                     94:               my $posnext='';
                     95:               if ($direction eq 'forward') {
                     96: # --------------------------------------------------------------------- Forward
1.33      www        97:                   while ($hash{'type_'.$rid} eq 'finish') {
                     98: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15      www        99:                   }
1.61      albertel  100: 		  foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
                    101: 		      my $thiscond=
                    102:       &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
1.15      www       103:                       if ($thiscond>=$mincond) {
                    104: 		          if ($posnext) {
1.61      albertel  105: 		             $posnext.=','.$id.':'.$thiscond;
1.15      www       106:                           } else {
1.61      albertel  107:                              $posnext=$id.':'.$thiscond;
1.15      www       108: 		          }
                    109:                           if ($thiscond>$mincond) { $mincond=$thiscond; }
                    110: 	              }
1.61      albertel  111:                   } 
                    112: 		  foreach my $id (split(/\,/,$posnext))  {
                    113:                       my ($linkid,$condval)=split(/\:/,$id);
1.15      www       114:                       if ($condval>=$mincond) {
                    115: 		          $next=&addrid($next,$hash{'goesto_'.$linkid},
                    116:                                 $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    117:                       }
1.61      albertel  118:                   }
1.15      www       119:                   if ($hash{'is_map_'.$next}) {
1.23      www       120: # This jumps to the beginning of a new map (going down level)
1.15      www       121:                       if (
                    122:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    123: 			  $mapurl=$hash{'src_'.$next};
                    124: 			  $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47      raeburn   125:                      } elsif (
                    126: # This jumps back up from an empty sequence, to a page up one level
                    127:                          $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    128:                          $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       129:                      }
1.23      www       130:                   } elsif 
                    131:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    132: # This comes up from a map (coming up one level);
                    133: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61      albertel  134: 		  }
1.15      www       135:               } elsif ($direction eq 'back') {
                    136: # ------------------------------------------------------------------- Backwards
1.33      www       137:                  while ($hash{'type_'.$rid} eq 'start') {
                    138: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
                    139: 		 }
1.62      albertel  140: 		 foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
                    141: 		     my $thiscond=
                    142:       &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
                    143: 		     if ($thiscond>=$mincond) {
                    144: 			 if ($posnext) {
                    145: 		             $posnext.=','.$id.':'.$thiscond;
                    146: 			 } else {
                    147:                              $posnext=$id.':'.$thiscond;
                    148: 			 }
                    149: 			 if ($thiscond>$mincond) { $mincond=$thiscond; }
                    150: 		     }
                    151: 		 } 
                    152: 		 foreach my $id (split(/\,/,$posnext)) {
                    153: 		     my ($linkid,$condval)=split(/\:/,$id);
                    154: 		     if ($condval>=$mincond) {
                    155: 			 $next=&addrid($next,$hash{'comesfrom_'.$linkid},
                    156: 				       $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    157: 		     }
                    158: 		 }
1.15      www       159:                   if ($hash{'is_map_'.$next}) {
1.24      www       160: # This jumps to the end of a new map (going down one level)
1.15      www       161:                       if (
                    162:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    163: 			  $mapurl=$hash{'src_'.$next};
                    164: 			  $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47      raeburn   165:                       } elsif (
                    166:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    167: # This jumps back up from an empty sequence, to a page up one level
                    168:                           $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
                    169:                       }
1.24      www       170:                   } elsif 
                    171:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    172: # This comes back up from a map (going up one level);
                    173: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       174:                   }
                    175: 	      }
                    176:               return ($next,$mapurl);
                    177: }
                    178: 
1.54      albertel  179: sub navlaunch {
                    180:     my ($r)=@_;
                    181:     &Apache::loncommon::content_type($r,'text/html');
                    182:     &Apache::loncommon::no_cache($r);
                    183:     $r->send_http_header;
                    184:     my $html=&Apache::lonxml::xmlbegin();
                    185:     $r->print("$html<head>\n");
                    186:     $r->print('</head>'.
                    187: 	      &Apache::loncommon::bodytag('Launched'));   
                    188:     $r->print(<<ENDNAV);
                    189:     <p><a href="/adm/flip?postdata=firstres%3a">Goto first resource</a></p>
                    190:     <script type="text/javascript">
                    191: 	function collapse() {
                    192: 	    menu=window.open("/adm/navmaps?collapseExternal","loncapanav",
                    193: 			     "height=600,width=400,scrollbars=1");
                    194: 	    this.document.location='/adm/navmaps?turningOffExternal';
                    195: 	}
                    196:     </script>
1.55      albertel  197:     <p><a href="javascript:collapse();">Collapse external navigation window</a></p>
1.54      albertel  198: ENDNAV
                    199:     $r->print(&Apache::loncommon::endbodytag().'</html>');
                    200: }
1.1       www       201: # ================================================================ Main Handler
                    202: 
                    203: sub handler {
1.2       www       204:    my $r=shift;
1.1       www       205: 
                    206: # ------------------------------------------- Set document type for header only
                    207: 
1.2       www       208:   if ($r->header_only) {
1.51      albertel  209:       &Apache::loncommon::content_type($r,'text/html');
                    210:       $r->send_http_header;
                    211:       return OK;
1.2       www       212:   }
                    213: 
1.5       www       214:   my %cachehash=(); 
                    215:   my $multichoice=0;
                    216:   my %multichoicehash=();
1.56      albertel  217:   my ($redirecturl,$redirectsymb);
1.4       www       218:   my $next='';
                    219:   my @possibilities=();
1.37      www       220:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53      albertel  221:   if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
                    222:       $env{'form.postdata'}=~/(\w+)\:(.*)/;
1.2       www       223:       my $direction=$1;
1.40      www       224:       my $currenturl=$2;
1.50      albertel  225:       if ($currenturl=~m|^/enc/|) {
                    226: 	  $currenturl=&Apache::lonenc::unencrypted($currenturl);
                    227:       }
1.46      www       228:       $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
1.54      albertel  229:       if ($direction eq 'firstres') {
                    230: 	  my $furl;
                    231: 	  if (tie(my %bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
                    232: 		  &GDBM_READER(),0640)) {
                    233: 	      $furl=$bighash{'first_url'};
                    234: 	      untie(%bighash);
                    235: 	  }
                    236: 	  &Apache::loncommon::content_type($r,'text/html');
                    237: 	  $r->header_out(Location => 
                    238: 			 'http://'.$ENV{'HTTP_HOST'}.$furl);
                    239: 	     
                    240: 	  return REDIRECT;
                    241:       }
                    242:       if ($direction eq 'return' || $direction eq 'navlaunch') {
1.10      www       243: # -------------------------------------------------------- Return to last known
                    244:          my $last;
1.53      albertel  245:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  246:                     &GDBM_READER(),0640)) {
1.10      www       247: 	     $last=$hash{'last_known'};
                    248:              untie(%hash);
                    249:          }
                    250:          my $newloc;
1.53      albertel  251:          if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36      www       252:                         &GDBM_READER(),0640))) {
1.52      albertel  253:             my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50      albertel  254: 	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
                    255: 	    $newloc=$hash{'src_'.$id};
                    256: 	    if ($newloc) {
                    257: 		if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
                    258: 			      
                    259: 	    } else {
1.57      www       260: 		$newloc='/adm/navmaps';
1.50      albertel  261: 	    }
1.36      www       262:             untie %hash;
1.10      www       263:          } else {
1.57      www       264: 	    $newloc='/adm/navmaps';
1.10      www       265:          }  
1.57      www       266: 	 if ($newloc eq '/adm/navmaps' && $direction eq 'navlaunch') {
1.54      albertel  267: 	     &navlaunch($r);
                    268: 	     return OK;
                    269: 	 } else {
                    270: 	     &Apache::loncommon::content_type($r,'text/html');
                    271: 	     $r->header_out(Location => 
                    272: 			    'http://'.$ENV{'HTTP_HOST'}.$newloc);
                    273: 	     
                    274: 	     return REDIRECT;
                    275: 	 }
1.10      www       276:       }
1.2       www       277:       $currenturl=~s/^http\:\/\///;
                    278:       $currenturl=~s/^[^\/]+//;
1.35      www       279: #
                    280: # Is the current URL on the map? If not, start with last known URL
                    281: #
                    282:       unless (&Apache::lonnet::is_on_map($currenturl)) {
1.7       www       283: 	 my $last;
1.53      albertel  284:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  285:                     &GDBM_READER(),0640)) {
1.7       www       286: 	     $last=$hash{'last_known'};
                    287:              untie(%hash);
                    288:          }
                    289:          if ($last) {
1.52      albertel  290: 	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7       www       291: 	 } else {
1.54      albertel  292: 	     if ($direction eq 'return') {
                    293: 		 &Apache::loncommon::content_type($r,'text/html');
                    294: 		 $r->header_out(Location => 
                    295: 				'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html');
                    296: 		 return REDIRECT;
                    297: 	     } else {
                    298: 		 &navlaunch($r);
                    299: 		 return OK;
                    300: 	     }
1.7       www       301:          }
                    302:       }
1.3       www       303: # ------------------------------------------- Do we have any idea where we are?
                    304:       my $position;
                    305:       if ($position=Apache::lonnet::symbread($currenturl)) {
                    306: # ------------------------------------------------------------------------- Yes
1.41      www       307: 	  my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52      albertel  308:           $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23      www       309:           $cachehash{$startoutmap}{'last_known'}=
1.52      albertel  310:                              [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20      albertel  311: 
1.5       www       312: # ============================================================ Tie the big hash
1.53      albertel  313:           if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel  314:                         &GDBM_READER(),0640)) {
1.29      www       315:               my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
                    316:                       '.'.$mapnum;
1.14      www       317: 
1.15      www       318: # ------------------------------------------------- Move forward, backward, etc
1.22      www       319:               my $endupmap;
                    320:               ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15      www       321: # -------------------------------------- Do we have one and only one empty URL?
                    322:               my $safecount=0;
1.26      www       323:               while (($next) && ($next!~/\,/) && 
1.48      albertel  324:                      ((!$hash{'src_'.$next}) || 
1.53      albertel  325: 		      ((!$env{'request.role.adv'}) && $hash{'randomout_'.$next}))
1.26      www       326:                      && ($safecount<10000)) {
1.22      www       327:                   ($next,$endupmap)=&move($next,$endupmap,$direction);
1.15      www       328:                   $safecount++;
                    329:               }
1.22      www       330: # We are now at at least one non-empty URL
1.4       www       331: # ----------------------------------------------------- Check out possibilities
                    332:               if ($next) {
                    333:                   @possibilities=split(/\,/,$next);
                    334:                   if ($#possibilities==0) {
1.5       www       335: # ---------------------------------------------- Only one possibility, redirect
1.56      albertel  336: 	              ($redirecturl,$redirectsymb)=&hash_src($next);
1.52      albertel  337:                       $cachehash{$endupmap}{$redirecturl}=
                    338: 			  [$redirecturl,(split(/\./,$next))[1]];
1.4       www       339:                   } else {
1.5       www       340: # ------------------------ There are multiple possibilities for a next resource
                    341:                       $multichoice=1;
1.62      albertel  342: 		      foreach my $id (@possibilities) {
                    343: 			  $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
                    344:                           $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
                    345:                           $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
                    346:                           (my $first, my $second) = $id =~ /(\d+).(\d+)/;
                    347:                           my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
                    348:                           $multichoicehash{'symb_'.$id} = 
1.32      bowersj2  349:                               Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
                    350:                                                         $second.'___'.$symbSrc);
                    351:                                                          
1.62      albertel  352:                           my ($choicemap,$choiceres)=split(/\./,$id);
1.52      albertel  353: 			  my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62      albertel  354: 			  my $url=$multichoicehash{'src_'.$id};
1.52      albertel  355:                           $cachehash{$map}{$url}=[$url,$choiceres];
1.62      albertel  356:                       }
1.4       www       357:                   }
1.5       www       358: 	      } else {
                    359: # -------------------------------------------------------------- No place to go
                    360:                   $multichoice=-1;
1.4       www       361:               }
1.5       www       362: # ----------------- The program must come past this point to untie the big hash
1.3       www       363: 	      untie(%hash);
1.5       www       364: # --------------------------------------------------------- Store position info
1.52      albertel  365:               $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.19      www       366:               foreach my $thismap (keys %cachehash) {
1.52      albertel  367: 		  my $mapnum=$cachehash{$thismap}->{'mapnum'};
                    368: 		  delete($cachehash{$thismap}->{'mapnum'});
                    369: 		  &Apache::lonnet::symblist($thismap,
                    370: 					    %{$cachehash{$thismap}});
1.19      www       371: 	      }
1.5       www       372: # ============================================== Do not return before this line
1.4       www       373:               if ($redirecturl) {
1.5       www       374: # ----------------------------------------------------- There is a URL to go to
1.38      www       375: 		  if ($direction eq 'forward') {
                    376:                      &Apache::lonnet::linklog($currenturl,$redirecturl);
                    377: 		  }
                    378: 		  if ($direction eq 'back') {
                    379:                      &Apache::lonnet::linklog($redirecturl,$currenturl);
                    380: 		  }
1.31      www       381: # ------------------------------------------------- Check for critical messages
1.53      albertel  382: 		  if ((time-$env{'user.criticalcheck.time'})>300) {
1.31      www       383:                      my @what=&Apache::lonnet::dump
1.53      albertel  384:                                   ('critical',$env{'user.domain'},
                    385:                                               $env{'user.name'});
1.31      www       386:                      if ($what[0]) {
                    387: 	                if (($what[0] ne 'con_lost') && 
                    388:                             ($what[0]!~/^error\:/)) {
                    389: 	                   $redirecturl='/adm/email?critical=display';
1.56      albertel  390: 			   $redirectsymb='';
1.31      www       391:                         }
                    392:                      }
                    393:                      &Apache::lonnet::appenv('user.criticalcheck.time'=>time);
                    394: 		  }
                    395: 
1.51      albertel  396: 		  &Apache::loncommon::content_type($r,'text/html');
1.56      albertel  397: 		  my $url='http://'.$ENV{'HTTP_HOST'}.$redirecturl;
1.58      www       398: 		  if ($redirectsymb ne '') { $url.='?symb='.&Apache::lonnet::escape($redirectsymb); }
1.56      albertel  399:                   $r->header_out(Location => $url);
1.4       www       400:                   return REDIRECT;
1.5       www       401: 	      } else {
                    402: # --------------------------------------------------------- There was a problem
1.51      albertel  403:                   &Apache::loncommon::content_type($r,'text/html');
1.8       www       404:                   $r->send_http_header;
1.59      www       405: 		  my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
                    406: 						     'explain' =>
                    407: 						     'You have reached the end of the sequence of materials.',
                    408: 						     'back' => 'Go Back',
                    409: 						     'nav' => 'Navigate Course Content',
                    410: 						     'wherenext' =>
                    411: 						     'There are several possibilities of where to go next',
                    412: 						     'pick' =>
                    413: 						     'Please click on the the resource you intend to access',
                    414: 						     'titleheader' => 'Title',
                    415: 						     'type' => 'Type');
1.8       www       416:                   if ($#possibilities>0) {
1.37      www       417: 		      my $bodytag=
                    418:                              &Apache::loncommon::bodytag('Multiple Resources');
1.8       www       419:                      $r->print(<<ENDSTART);
                    420: <head><title>Choose Next Location</title></head>
1.37      www       421: $bodytag
1.59      www       422: <h3>$lt{'wherenext'}</h3>
1.8       www       423: <p>
1.59      www       424: $lt{'pick'}:
1.8       www       425: <p>
                    426: <table border=2>
1.59      www       427: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8       www       428: ENDSTART
1.62      albertel  429:                      foreach my $id (@possibilities) {
1.8       www       430:                         $r->print(
                    431:                               '<tr><td><a href="'.
1.62      albertel  432:                               $multichoicehash{'src_'.$id}.'?symb=' .
                    433:                                   Apache::lonnet::escape($multichoicehash{'symb_'.$id}).'">'.
                    434:                               $multichoicehash{'title_'.$id}.
                    435:                               '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8       www       436: 			      '</td></tr>');
1.26      www       437:                      }
1.59      www       438:                      $r->print('</table>');
1.8       www       439:                   } else {
1.37      www       440: 		      my $bodytag=&Apache::loncommon::bodytag('No Resource');
1.59      www       441: 		      $r->print(<<ENDNONE);
1.37      www       442: <head><title>No Resource</title></head>
                    443: $bodytag
1.59      www       444: <h3>$lt{'title'}</h3>
                    445: <p>$lt{'explain'}</p>
                    446: ENDNONE
                    447: 		  }
                    448: 		  $r->print(<<ENDMENU);
1.37      www       449: <ul>
1.59      www       450: <li><a href="/adm/flip?postdata=return:">$lt{'back'}</a></li>
                    451: <li><a href="/adm/navmaps">$lt{'nav'}</a></li>
                    452: </ul></body></html>
                    453: ENDMENU
                    454:                   return OK;
                    455: 	      }
1.5       www       456: 	  } else {
                    457: # ------------------------------------------------- Problem, could not tie hash
1.53      albertel  458:               $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5       www       459:               return HTTP_NOT_ACCEPTABLE; 
1.3       www       460:           }
1.5       www       461:       } else {
                    462: # ---------------------------------------- No, could not determine where we are
1.42      albertel  463: 	  $r->internal_redirect('/adm/ambiguous');
1.2       www       464:       }
1.5       www       465:   } else {
1.2       www       466: # -------------------------- Class was not initialized or page fliped strangely
1.53      albertel  467:       $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2       www       468:       return HTTP_NOT_ACCEPTABLE; 
                    469:   } 
1.1       www       470: }
                    471: 
                    472: 1;
                    473: __END__
                    474: 
                    475: 
                    476: 
                    477: 
                    478: 
                    479: 
                    480: 

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