Annotation of rat/lonpageflip.pm, revision 1.60

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Page flip handler
                      4: #
1.60    ! albertel    5: # $Id: lonpageflip.pm,v 1.59 2005/11/10 19:16:02 www 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:     }
                     49: }
1.1       www        50: 
1.3       www        51: sub addrid {
1.4       www        52:     my ($current,$new,$condid)=@_;
                     53:     unless ($condid) { $condid=0; }
1.27      www        54: 
1.3       www        55: 	if ($current) {
1.5       www        56: 	    $current.=','.$new;
1.3       www        57:         } else {
1.5       www        58:             $current=''.$new;
1.3       www        59:         }
1.27      www        60: 
1.3       www        61:     return $current;
1.25      www        62: }
                     63: 
                     64: sub fullmove {
                     65:     my ($rid,$mapurl,$direction)=@_;
1.53      albertel   66:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel   67:                         &GDBM_READER(),0640)) {
1.25      www        68: 	($rid,$mapurl)=&move($rid,$mapurl,$direction);
                     69:         untie(%hash);
                     70:     }
                     71:     return($rid,$mapurl);
1.1       www        72: }
                     73: 
1.50      albertel   74: sub hash_src {
                     75:     my ($id)=@_;
1.56      albertel   76:     my ($mapid,$resid)=split(/\./,$id);
                     77:     my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                     78: 					  $resid,$hash{'src_'.$id});
1.50      albertel   79:     if ($hash{'encrypted_'.$id}) {
1.56      albertel   80: 	return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
                     81: 		&Apache::lonenc::encrypted($symb));
1.50      albertel   82:     }
1.56      albertel   83:     return ($hash{'src_'.$id},$symb);
1.50      albertel   84: }
                     85: 
1.15      www        86: sub move {
                     87:     my ($rid,$mapurl,$direction)=@_;
1.23      www        88:     my $startoutrid=$rid;
1.15      www        89: 
                     90:     my $next='';
                     91: 
                     92:               my $mincond=1;
                     93:               my $posnext='';
                     94:               if ($direction eq 'forward') {
                     95: # --------------------------------------------------------------------- Forward
1.33      www        96:                   while ($hash{'type_'.$rid} eq 'finish') {
                     97: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15      www        98:                   }
                     99:                   map {
                    100:                       my $thiscond=
                    101:       &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
                    102:                       if ($thiscond>=$mincond) {
                    103: 		          if ($posnext) {
                    104: 		             $posnext.=','.$_.':'.$thiscond;
                    105:                           } else {
                    106:                              $posnext=$_.':'.$thiscond;
                    107: 		          }
                    108:                           if ($thiscond>$mincond) { $mincond=$thiscond; }
                    109: 	              }
                    110:                   } split(/\,/,$hash{'to_'.$rid});
                    111:                   map {
                    112:                       my ($linkid,$condval)=split(/\:/,$_);
                    113:                       if ($condval>=$mincond) {
                    114: 		          $next=&addrid($next,$hash{'goesto_'.$linkid},
                    115:                                 $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    116:                       }
                    117:                   } split(/\,/,$posnext);
                    118:                   if ($hash{'is_map_'.$next}) {
1.23      www       119: # This jumps to the beginning of a new map (going down level)
1.15      www       120:                       if (
                    121:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    122: 			  $mapurl=$hash{'src_'.$next};
                    123: 			  $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47      raeburn   124:                      } elsif (
                    125: # This jumps back up from an empty sequence, to a page up one level
                    126:                          $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    127:                          $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       128:                      }
1.23      www       129:                   } elsif 
                    130:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    131: # This comes up from a map (coming up one level);
                    132: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       133:                   }
                    134:               } elsif ($direction eq 'back') {
                    135: # ------------------------------------------------------------------- Backwards
1.33      www       136:                  while ($hash{'type_'.$rid} eq 'start') {
                    137: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
                    138: 		 }
1.15      www       139:                   map {
                    140:                       my $thiscond=
                    141:       &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
                    142:                       if ($thiscond>=$mincond) {
                    143: 		          if ($posnext) {
                    144: 		             $posnext.=','.$_.':'.$thiscond;
                    145:                           } else {
                    146:                              $posnext=$_.':'.$thiscond;
                    147: 		          }
                    148:                           if ($thiscond>$mincond) { $mincond=$thiscond; }
                    149: 	              }
                    150:                   } split(/\,/,$hash{'from_'.$rid});
                    151:                   map {
                    152:                       my ($linkid,$condval)=split(/\:/,$_);
                    153:                       if ($condval>=$mincond) {
                    154: 		          $next=&addrid($next,$hash{'comesfrom_'.$linkid},
                    155:                                 $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    156:                       }
                    157:                   } split(/\,/,$posnext);
                    158:                   if ($hash{'is_map_'.$next}) {
1.24      www       159: # This jumps to the end of a new map (going down one level)
1.15      www       160:                       if (
                    161:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    162: 			  $mapurl=$hash{'src_'.$next};
                    163: 			  $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47      raeburn   164:                       } elsif (
                    165:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    166: # This jumps back up from an empty sequence, to a page up one level
                    167:                           $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
                    168:                       }
1.24      www       169:                   } elsif 
                    170:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    171: # This comes back up from a map (going up one level);
                    172: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       173:                   }
                    174: 	      }
                    175:               return ($next,$mapurl);
                    176: }
                    177: 
1.54      albertel  178: sub navlaunch {
                    179:     my ($r)=@_;
                    180:     &Apache::loncommon::content_type($r,'text/html');
                    181:     &Apache::loncommon::no_cache($r);
                    182:     $r->send_http_header;
                    183:     my $html=&Apache::lonxml::xmlbegin();
                    184:     $r->print("$html<head>\n");
                    185:     $r->print('</head>'.
                    186: 	      &Apache::loncommon::bodytag('Launched'));   
                    187:     $r->print(<<ENDNAV);
                    188:     <p><a href="/adm/flip?postdata=firstres%3a">Goto first resource</a></p>
                    189:     <script type="text/javascript">
                    190: 	function collapse() {
                    191: 	    menu=window.open("/adm/navmaps?collapseExternal","loncapanav",
                    192: 			     "height=600,width=400,scrollbars=1");
                    193: 	    this.document.location='/adm/navmaps?turningOffExternal';
                    194: 	}
                    195:     </script>
1.55      albertel  196:     <p><a href="javascript:collapse();">Collapse external navigation window</a></p>
1.54      albertel  197: ENDNAV
                    198:     $r->print(&Apache::loncommon::endbodytag().'</html>');
                    199: }
1.1       www       200: # ================================================================ Main Handler
                    201: 
                    202: sub handler {
1.2       www       203:    my $r=shift;
1.1       www       204: 
                    205: # ------------------------------------------- Set document type for header only
                    206: 
1.2       www       207:   if ($r->header_only) {
1.51      albertel  208:       &Apache::loncommon::content_type($r,'text/html');
                    209:       $r->send_http_header;
                    210:       return OK;
1.2       www       211:   }
                    212: 
1.5       www       213:   my %cachehash=(); 
                    214:   my $multichoice=0;
                    215:   my %multichoicehash=();
1.56      albertel  216:   my ($redirecturl,$redirectsymb);
1.4       www       217:   my $next='';
                    218:   my @possibilities=();
1.37      www       219:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53      albertel  220:   if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
                    221:       $env{'form.postdata'}=~/(\w+)\:(.*)/;
1.2       www       222:       my $direction=$1;
1.40      www       223:       my $currenturl=$2;
1.50      albertel  224:       if ($currenturl=~m|^/enc/|) {
                    225: 	  $currenturl=&Apache::lonenc::unencrypted($currenturl);
                    226:       }
1.46      www       227:       $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
1.54      albertel  228:       if ($direction eq 'firstres') {
                    229: 	  my $furl;
                    230: 	  if (tie(my %bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
                    231: 		  &GDBM_READER(),0640)) {
                    232: 	      $furl=$bighash{'first_url'};
                    233: 	      untie(%bighash);
                    234: 	  }
                    235: 	  &Apache::loncommon::content_type($r,'text/html');
                    236: 	  $r->header_out(Location => 
                    237: 			 'http://'.$ENV{'HTTP_HOST'}.$furl);
                    238: 	     
                    239: 	  return REDIRECT;
                    240:       }
                    241:       if ($direction eq 'return' || $direction eq 'navlaunch') {
1.10      www       242: # -------------------------------------------------------- Return to last known
                    243:          my $last;
1.53      albertel  244:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  245:                     &GDBM_READER(),0640)) {
1.10      www       246: 	     $last=$hash{'last_known'};
                    247:              untie(%hash);
                    248:          }
                    249:          my $newloc;
1.53      albertel  250:          if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36      www       251:                         &GDBM_READER(),0640))) {
1.52      albertel  252:             my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50      albertel  253: 	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
                    254: 	    $newloc=$hash{'src_'.$id};
                    255: 	    if ($newloc) {
                    256: 		if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
                    257: 			      
                    258: 	    } else {
1.57      www       259: 		$newloc='/adm/navmaps';
1.50      albertel  260: 	    }
1.36      www       261:             untie %hash;
1.10      www       262:          } else {
1.57      www       263: 	    $newloc='/adm/navmaps';
1.10      www       264:          }  
1.57      www       265: 	 if ($newloc eq '/adm/navmaps' && $direction eq 'navlaunch') {
1.54      albertel  266: 	     &navlaunch($r);
                    267: 	     return OK;
                    268: 	 } else {
                    269: 	     &Apache::loncommon::content_type($r,'text/html');
                    270: 	     $r->header_out(Location => 
                    271: 			    'http://'.$ENV{'HTTP_HOST'}.$newloc);
                    272: 	     
                    273: 	     return REDIRECT;
                    274: 	 }
1.10      www       275:       }
1.2       www       276:       $currenturl=~s/^http\:\/\///;
                    277:       $currenturl=~s/^[^\/]+//;
1.35      www       278: #
                    279: # Is the current URL on the map? If not, start with last known URL
                    280: #
                    281:       unless (&Apache::lonnet::is_on_map($currenturl)) {
1.7       www       282: 	 my $last;
1.53      albertel  283:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  284:                     &GDBM_READER(),0640)) {
1.7       www       285: 	     $last=$hash{'last_known'};
                    286:              untie(%hash);
                    287:          }
                    288:          if ($last) {
1.52      albertel  289: 	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7       www       290: 	 } else {
1.54      albertel  291: 	     if ($direction eq 'return') {
                    292: 		 &Apache::loncommon::content_type($r,'text/html');
                    293: 		 $r->header_out(Location => 
                    294: 				'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html');
                    295: 		 return REDIRECT;
                    296: 	     } else {
                    297: 		 &navlaunch($r);
                    298: 		 return OK;
                    299: 	     }
1.7       www       300:          }
                    301:       }
1.3       www       302: # ------------------------------------------- Do we have any idea where we are?
                    303:       my $position;
                    304:       if ($position=Apache::lonnet::symbread($currenturl)) {
                    305: # ------------------------------------------------------------------------- Yes
1.41      www       306: 	  my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52      albertel  307:           $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23      www       308:           $cachehash{$startoutmap}{'last_known'}=
1.52      albertel  309:                              [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20      albertel  310: 
1.5       www       311: # ============================================================ Tie the big hash
1.53      albertel  312:           if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel  313:                         &GDBM_READER(),0640)) {
1.29      www       314:               my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
                    315:                       '.'.$mapnum;
1.14      www       316: 
1.15      www       317: # ------------------------------------------------- Move forward, backward, etc
1.22      www       318:               my $endupmap;
                    319:               ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15      www       320: # -------------------------------------- Do we have one and only one empty URL?
                    321:               my $safecount=0;
1.26      www       322:               while (($next) && ($next!~/\,/) && 
1.48      albertel  323:                      ((!$hash{'src_'.$next}) || 
1.53      albertel  324: 		      ((!$env{'request.role.adv'}) && $hash{'randomout_'.$next}))
1.26      www       325:                      && ($safecount<10000)) {
1.22      www       326:                   ($next,$endupmap)=&move($next,$endupmap,$direction);
1.15      www       327:                   $safecount++;
                    328:               }
1.22      www       329: # We are now at at least one non-empty URL
1.4       www       330: # ----------------------------------------------------- Check out possibilities
                    331:               if ($next) {
                    332:                   @possibilities=split(/\,/,$next);
                    333:                   if ($#possibilities==0) {
1.5       www       334: # ---------------------------------------------- Only one possibility, redirect
1.56      albertel  335: 	              ($redirecturl,$redirectsymb)=&hash_src($next);
1.52      albertel  336:                       $cachehash{$endupmap}{$redirecturl}=
                    337: 			  [$redirecturl,(split(/\./,$next))[1]];
1.4       www       338:                   } else {
1.5       www       339: # ------------------------ There are multiple possibilities for a next resource
                    340:                       $multichoice=1;
                    341:                       map {
                    342: 			  $multichoicehash{'src_'.$_}=$hash{'src_'.$_};
                    343:                           $multichoicehash{'title_'.$_}=$hash{'title_'.$_};
1.6       www       344:                           $multichoicehash{'type_'.$_}=$hash{'type_'.$_};
1.32      bowersj2  345:                           (my $first, my $second) = $_ =~ /(\d+).(\d+)/;
                    346:                           my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$_});
                    347:                           $multichoicehash{'symb_'.$_} = 
                    348:                               Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
                    349:                                                         $second.'___'.$symbSrc);
                    350:                                                          
1.22      www       351:                           my ($choicemap,$choiceres)=split(/\./,$_);
1.52      albertel  352: 			  my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
                    353: 			  my $url=$multichoicehash{'src_'.$_};
                    354:                           $cachehash{$map}{$url}=[$url,$choiceres];
1.5       www       355:                       } @possibilities;
1.4       www       356:                   }
1.5       www       357: 	      } else {
                    358: # -------------------------------------------------------------- No place to go
                    359:                   $multichoice=-1;
1.4       www       360:               }
1.5       www       361: # ----------------- The program must come past this point to untie the big hash
1.3       www       362: 	      untie(%hash);
1.5       www       363: # --------------------------------------------------------- Store position info
1.52      albertel  364:               $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.19      www       365:               foreach my $thismap (keys %cachehash) {
1.52      albertel  366: 		  my $mapnum=$cachehash{$thismap}->{'mapnum'};
                    367: 		  delete($cachehash{$thismap}->{'mapnum'});
                    368: 		  &Apache::lonnet::symblist($thismap,
                    369: 					    %{$cachehash{$thismap}});
1.19      www       370: 	      }
1.5       www       371: # ============================================== Do not return before this line
1.4       www       372:               if ($redirecturl) {
1.5       www       373: # ----------------------------------------------------- There is a URL to go to
1.38      www       374: 		  if ($direction eq 'forward') {
                    375:                      &Apache::lonnet::linklog($currenturl,$redirecturl);
                    376: 		  }
                    377: 		  if ($direction eq 'back') {
                    378:                      &Apache::lonnet::linklog($redirecturl,$currenturl);
                    379: 		  }
1.31      www       380: # ------------------------------------------------- Check for critical messages
1.53      albertel  381: 		  if ((time-$env{'user.criticalcheck.time'})>300) {
1.31      www       382:                      my @what=&Apache::lonnet::dump
1.53      albertel  383:                                   ('critical',$env{'user.domain'},
                    384:                                               $env{'user.name'});
1.31      www       385:                      if ($what[0]) {
                    386: 	                if (($what[0] ne 'con_lost') && 
                    387:                             ($what[0]!~/^error\:/)) {
                    388: 	                   $redirecturl='/adm/email?critical=display';
1.56      albertel  389: 			   $redirectsymb='';
1.31      www       390:                         }
                    391:                      }
                    392:                      &Apache::lonnet::appenv('user.criticalcheck.time'=>time);
                    393: 		  }
                    394: 
1.51      albertel  395: 		  &Apache::loncommon::content_type($r,'text/html');
1.56      albertel  396: 		  my $url='http://'.$ENV{'HTTP_HOST'}.$redirecturl;
1.58      www       397: 		  if ($redirectsymb ne '') { $url.='?symb='.&Apache::lonnet::escape($redirectsymb); }
1.56      albertel  398:                   $r->header_out(Location => $url);
1.4       www       399:                   return REDIRECT;
1.5       www       400: 	      } else {
                    401: # --------------------------------------------------------- There was a problem
1.51      albertel  402:                   &Apache::loncommon::content_type($r,'text/html');
1.8       www       403:                   $r->send_http_header;
1.59      www       404: 		  my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
                    405: 						     'explain' =>
                    406: 						     'You have reached the end of the sequence of materials.',
                    407: 						     'back' => 'Go Back',
                    408: 						     'nav' => 'Navigate Course Content',
                    409: 						     'wherenext' =>
                    410: 						     'There are several possibilities of where to go next',
                    411: 						     'pick' =>
                    412: 						     'Please click on the the resource you intend to access',
                    413: 						     'titleheader' => 'Title',
                    414: 						     'type' => 'Type');
1.8       www       415:                   if ($#possibilities>0) {
1.37      www       416: 		      my $bodytag=
                    417:                              &Apache::loncommon::bodytag('Multiple Resources');
1.8       www       418:                      $r->print(<<ENDSTART);
                    419: <head><title>Choose Next Location</title></head>
1.37      www       420: $bodytag
1.59      www       421: <h3>$lt{'wherenext'}</h3>
1.8       www       422: <p>
1.59      www       423: $lt{'pick'}:
1.8       www       424: <p>
                    425: <table border=2>
1.59      www       426: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8       www       427: ENDSTART
1.26      www       428:                      foreach (@possibilities) {
1.8       www       429:                         $r->print(
                    430:                               '<tr><td><a href="'.
1.32      bowersj2  431:                               $multichoicehash{'src_'.$_}.'?symb=' .
                    432:                                   Apache::lonnet::escape($multichoicehash{'symb_'.$_}).'">'.
1.8       www       433:                               $multichoicehash{'title_'.$_}.
                    434:                               '</a></td><td>'.$multichoicehash{'type_'.$_}.
                    435: 			      '</td></tr>');
1.26      www       436:                      }
1.59      www       437:                      $r->print('</table>');
1.8       www       438:                   } else {
1.37      www       439: 		      my $bodytag=&Apache::loncommon::bodytag('No Resource');
1.59      www       440: 		      $r->print(<<ENDNONE);
1.37      www       441: <head><title>No Resource</title></head>
                    442: $bodytag
1.59      www       443: <h3>$lt{'title'}</h3>
                    444: <p>$lt{'explain'}</p>
                    445: ENDNONE
                    446: 		  }
                    447: 		  $r->print(<<ENDMENU);
1.37      www       448: <ul>
1.59      www       449: <li><a href="/adm/flip?postdata=return:">$lt{'back'}</a></li>
                    450: <li><a href="/adm/navmaps">$lt{'nav'}</a></li>
                    451: </ul></body></html>
                    452: ENDMENU
                    453:                   return OK;
                    454: 	      }
1.5       www       455: 	  } else {
                    456: # ------------------------------------------------- Problem, could not tie hash
1.53      albertel  457:               $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5       www       458:               return HTTP_NOT_ACCEPTABLE; 
1.3       www       459:           }
1.5       www       460:       } else {
                    461: # ---------------------------------------- No, could not determine where we are
1.42      albertel  462: 	  $r->internal_redirect('/adm/ambiguous');
1.2       www       463:       }
1.5       www       464:   } else {
1.2       www       465: # -------------------------- Class was not initialized or page fliped strangely
1.53      albertel  466:       $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2       www       467:       return HTTP_NOT_ACCEPTABLE; 
                    468:   } 
1.1       www       469: }
                    470: 
                    471: 1;
                    472: __END__
                    473: 
                    474: 
                    475: 
                    476: 
                    477: 
                    478: 
                    479: 

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