Annotation of rat/lonpageflip.pm, revision 1.76

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Page flip handler
                      4: #
1.76    ! jms         5: # $Id: lonpageflip.pm,v 1.75 2008/03/12 02:45:50 raeburn 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: 
1.76    ! jms        30: =pod
        !            31: 
        !            32: =head1 NAME
        !            33: 
        !            34: Apache::lonpageflip
        !            35: 
        !            36: =head1 SYNOPSIS
        !            37: 
        !            38: Deals with forward, backward, and other page flips.
        !            39: 
        !            40: This is part of the LearningOnline Network with CAPA project
        !            41: described at http://www.lon-capa.org.
        !            42: 
        !            43: =head1 OVERVIEW
        !            44: 
        !            45: (empty)
        !            46: 
        !            47: =head1 SUBROUTINES
        !            48: 
        !            49: =over cleanup()
        !            50: 
        !            51: =item addrid()
        !            52: 
        !            53: =item fullmove()
        !            54: 
        !            55: =item hash_src()
        !            56: 
        !            57: =item move()
        !            58: 
        !            59: =item get_next_possible_move()
        !            60: 
        !            61: =item navlaunch()
        !            62: 
        !            63: =item first_accessible_resource()
        !            64: 
        !            65: =item handler()
        !            66: 
        !            67: =back
        !            68: 
        !            69: =cut
        !            70: 
        !            71: 
1.1       www        72: package Apache::lonpageflip;
                     73: 
                     74: use strict;
1.68      albertel   75: use LONCAPA;
1.4       www        76: use Apache::Constants qw(:common :http REDIRECT);
1.53      albertel   77: use Apache::lonnet;
1.70      albertel   78: use Apache::loncommon();
1.1       www        79: use HTML::TokeParser;
                     80: use GDBM_File;
                     81: 
1.3       www        82: # ========================================================== Module Global Hash
                     83:   
1.1       www        84: my %hash;
1.34      www        85: 
                     86: sub cleanup {
                     87:     if (tied(%hash)){
                     88: 	&Apache::lonnet::logthis('Cleanup pageflip: hash');
                     89:         unless (untie(%hash)) {
                     90: 	    &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
                     91:         }
                     92:     }
1.63      albertel   93:     return OK;
1.34      www        94: }
1.1       www        95: 
1.3       www        96: sub addrid {
1.4       www        97:     my ($current,$new,$condid)=@_;
                     98:     unless ($condid) { $condid=0; }
1.27      www        99: 
1.3       www       100: 	if ($current) {
1.5       www       101: 	    $current.=','.$new;
1.3       www       102:         } else {
1.5       www       103:             $current=''.$new;
1.3       www       104:         }
1.27      www       105: 
1.3       www       106:     return $current;
1.25      www       107: }
                    108: 
                    109: sub fullmove {
                    110:     my ($rid,$mapurl,$direction)=@_;
1.53      albertel  111:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel  112:                         &GDBM_READER(),0640)) {
1.25      www       113: 	($rid,$mapurl)=&move($rid,$mapurl,$direction);
                    114:         untie(%hash);
                    115:     }
                    116:     return($rid,$mapurl);
1.1       www       117: }
                    118: 
1.50      albertel  119: sub hash_src {
                    120:     my ($id)=@_;
1.56      albertel  121:     my ($mapid,$resid)=split(/\./,$id);
                    122:     my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    123: 					  $resid,$hash{'src_'.$id});
1.50      albertel  124:     if ($hash{'encrypted_'.$id}) {
1.56      albertel  125: 	return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
                    126: 		&Apache::lonenc::encrypted($symb));
1.50      albertel  127:     }
1.56      albertel  128:     return ($hash{'src_'.$id},$symb);
1.50      albertel  129: }
                    130: 
1.15      www       131: sub move {
1.72      albertel  132:     my ($next,$endupmap,$direction) = @_;
                    133:     my $safecount=0;
                    134:     my $allowed=0;
                    135:     do {
                    136: 	($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
                    137: 
                    138: 	my $url = $hash{'src_'.$next};
                    139: 	my ($mapid,$resid)=split(/\./,$next);
                    140: 	my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    141: 						$resid,$url);
                    142: 	if ($url eq '' || $symb eq '') {
                    143: 	    $allowed = 0;
                    144: 	} else {
                    145: 	    my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
                    146: 	    $allowed = (($priv eq 'F') || ($priv eq '2'));
                    147: 	}
                    148: 	$safecount++;
                    149:     } while (   ($next)
                    150: 	     && ($next!~/\,/)
                    151: 	     && (
                    152: 		    (!$hash{'src_'.$next})
                    153: 		 || (
                    154: 		        (!$env{'request.role.adv'})
                    155: 		     &&  $hash{'randomout_'.$next}
                    156: 		    )
                    157: 		 || (!$allowed)
                    158: 		)
                    159: 	     && ($safecount<10000));
                    160: 
                    161:     return ($next,$endupmap);
                    162: }
                    163: 
                    164: sub get_next_possible_move {
1.15      www       165:     my ($rid,$mapurl,$direction)=@_;
1.23      www       166:     my $startoutrid=$rid;
1.15      www       167: 
                    168:     my $next='';
                    169: 
                    170:               my $mincond=1;
                    171:               my $posnext='';
                    172:               if ($direction eq 'forward') {
                    173: # --------------------------------------------------------------------- Forward
1.33      www       174:                   while ($hash{'type_'.$rid} eq 'finish') {
                    175: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15      www       176:                   }
1.61      albertel  177: 		  foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.64      albertel  178: 		     my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
                    179: 		     my $rescond  = &Apache::lonnet::docondval($condition);
                    180: 		     my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
                    181: 		     my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
                    182: 		     if ($thiscond>=$mincond) {
1.15      www       183: 		          if ($posnext) {
1.61      albertel  184: 		             $posnext.=','.$id.':'.$thiscond;
1.15      www       185:                           } else {
1.61      albertel  186:                              $posnext=$id.':'.$thiscond;
1.15      www       187: 		          }
                    188:                           if ($thiscond>$mincond) { $mincond=$thiscond; }
                    189: 	              }
1.61      albertel  190:                   } 
                    191: 		  foreach my $id (split(/\,/,$posnext))  {
                    192:                       my ($linkid,$condval)=split(/\:/,$id);
1.15      www       193:                       if ($condval>=$mincond) {
                    194: 		          $next=&addrid($next,$hash{'goesto_'.$linkid},
                    195:                                 $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    196:                       }
1.61      albertel  197:                   }
1.15      www       198:                   if ($hash{'is_map_'.$next}) {
1.23      www       199: # This jumps to the beginning of a new map (going down level)
1.15      www       200:                       if (
                    201:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    202: 			  $mapurl=$hash{'src_'.$next};
                    203: 			  $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47      raeburn   204:                      } elsif (
                    205: # This jumps back up from an empty sequence, to a page up one level
                    206:                          $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    207:                          $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       208:                      }
1.23      www       209:                   } elsif 
                    210:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    211: # This comes up from a map (coming up one level);
                    212: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61      albertel  213: 		  }
1.15      www       214:               } elsif ($direction eq 'back') {
                    215: # ------------------------------------------------------------------- Backwards
1.33      www       216:                  while ($hash{'type_'.$rid} eq 'start') {
                    217: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
                    218: 		 }
1.62      albertel  219: 		 foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
1.64      albertel  220: 		     my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
                    221: 		     my $rescond  = &Apache::lonnet::docondval($condition);
                    222: 		     my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
                    223: 		     my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
1.62      albertel  224: 		     if ($thiscond>=$mincond) {
                    225: 			 if ($posnext) {
                    226: 		             $posnext.=','.$id.':'.$thiscond;
                    227: 			 } else {
                    228:                              $posnext=$id.':'.$thiscond;
                    229: 			 }
                    230: 			 if ($thiscond>$mincond) { $mincond=$thiscond; }
                    231: 		     }
                    232: 		 } 
                    233: 		 foreach my $id (split(/\,/,$posnext)) {
                    234: 		     my ($linkid,$condval)=split(/\:/,$id);
                    235: 		     if ($condval>=$mincond) {
                    236: 			 $next=&addrid($next,$hash{'comesfrom_'.$linkid},
                    237: 				       $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    238: 		     }
                    239: 		 }
1.15      www       240:                   if ($hash{'is_map_'.$next}) {
1.24      www       241: # This jumps to the end of a new map (going down one level)
1.15      www       242:                       if (
                    243:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    244: 			  $mapurl=$hash{'src_'.$next};
                    245: 			  $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47      raeburn   246:                       } elsif (
                    247:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    248: # This jumps back up from an empty sequence, to a page up one level
                    249:                           $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
                    250:                       }
1.24      www       251:                   } elsif 
                    252:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    253: # This comes back up from a map (going up one level);
                    254: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       255:                   }
                    256: 	      }
                    257:               return ($next,$mapurl);
                    258: }
                    259: 
1.54      albertel  260: sub navlaunch {
                    261:     my ($r)=@_;
                    262:     &Apache::loncommon::content_type($r,'text/html');
                    263:     &Apache::loncommon::no_cache($r);
                    264:     $r->send_http_header;
1.67      albertel  265:     $r->print(&Apache::loncommon::start_page('Launched'));   
1.54      albertel  266:     $r->print(<<ENDNAV);
                    267:     <p><a href="/adm/flip?postdata=firstres%3a">Goto first resource</a></p>
                    268:     <script type="text/javascript">
                    269: 	function collapse() {
                    270: 	    menu=window.open("/adm/navmaps?collapseExternal","loncapanav",
                    271: 			     "height=600,width=400,scrollbars=1");
                    272: 	    this.document.location='/adm/navmaps?turningOffExternal';
                    273: 	}
                    274:     </script>
1.55      albertel  275:     <p><a href="javascript:collapse();">Collapse external navigation window</a></p>
1.54      albertel  276: ENDNAV
1.67      albertel  277:     $r->print(&Apache::loncommon::end_page());
1.54      albertel  278: }
1.69      www       279: 
                    280: sub first_accessible_resource {
                    281:     my $furl;
                    282:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
                    283: 	    &GDBM_READER(),0640)) {
                    284: 	$furl=$hash{'first_url'};
1.74      albertel  285: 	my %args;
                    286: 	my ($url,$args) = split(/\?/,$furl);
                    287: 	foreach my $pair (split(/\&/,$args)) {
                    288: 	    my ($name,$value) = split(/=/,$pair);
                    289: 	    $args{&unescape($name)} = &unescape($value);
                    290: 	}
                    291:         if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
1.69      www       292: # Wow, we cannot see this ... move forward to the next one that we can see
                    293: 	    my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
                    294: # Build the new URL
1.73      albertel  295: 	    my ($newmapid,$newresid)=split(/\./,$newrid);
1.69      www       296: 	    my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
                    297: 	    $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
                    298: 	    if ($hash{'encrypted_'.$newrid}) {
                    299: 		$furl=&Apache::lonenc::encrypted($furl);
                    300: 	    }
                    301: 	}
                    302: 	untie(%hash);
                    303: 	return $furl;
                    304:     } else {
                    305: 	return '/adm/navmaps';
                    306:     }
                    307: }
                    308: 
1.1       www       309: # ================================================================ Main Handler
                    310: 
                    311: sub handler {
1.2       www       312:    my $r=shift;
1.1       www       313: 
                    314: # ------------------------------------------- Set document type for header only
                    315: 
1.2       www       316:   if ($r->header_only) {
1.51      albertel  317:       &Apache::loncommon::content_type($r,'text/html');
                    318:       $r->send_http_header;
                    319:       return OK;
1.2       www       320:   }
                    321: 
1.5       www       322:   my %cachehash=(); 
                    323:   my $multichoice=0;
                    324:   my %multichoicehash=();
1.56      albertel  325:   my ($redirecturl,$redirectsymb);
1.4       www       326:   my $next='';
                    327:   my @possibilities=();
1.37      www       328:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53      albertel  329:   if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
                    330:       $env{'form.postdata'}=~/(\w+)\:(.*)/;
1.2       www       331:       my $direction=$1;
1.40      www       332:       my $currenturl=$2;
1.50      albertel  333:       if ($currenturl=~m|^/enc/|) {
                    334: 	  $currenturl=&Apache::lonenc::unencrypted($currenturl);
                    335:       }
1.46      www       336:       $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
1.54      albertel  337:       if ($direction eq 'firstres') {
1.69      www       338: 	  my $furl=&first_accessible_resource();
1.54      albertel  339: 	  &Apache::loncommon::content_type($r,'text/html');
                    340: 	  $r->header_out(Location => 
1.71      albertel  341: 			 &Apache::lonnet::absolute_url().$furl);
1.54      albertel  342: 	     
                    343: 	  return REDIRECT;
                    344:       }
                    345:       if ($direction eq 'return' || $direction eq 'navlaunch') {
1.10      www       346: # -------------------------------------------------------- Return to last known
                    347:          my $last;
1.53      albertel  348:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  349:                     &GDBM_READER(),0640)) {
1.10      www       350: 	     $last=$hash{'last_known'};
                    351:              untie(%hash);
                    352:          }
                    353:          my $newloc;
1.53      albertel  354:          if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36      www       355:                         &GDBM_READER(),0640))) {
1.52      albertel  356:             my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50      albertel  357: 	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
                    358: 	    $newloc=$hash{'src_'.$id};
                    359: 	    if ($newloc) {
                    360: 		if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
                    361: 			      
                    362: 	    } else {
1.57      www       363: 		$newloc='/adm/navmaps';
1.50      albertel  364: 	    }
1.36      www       365:             untie %hash;
1.10      www       366:          } else {
1.57      www       367: 	    $newloc='/adm/navmaps';
1.10      www       368:          }  
1.57      www       369: 	 if ($newloc eq '/adm/navmaps' && $direction eq 'navlaunch') {
1.54      albertel  370: 	     &navlaunch($r);
                    371: 	     return OK;
                    372: 	 } else {
                    373: 	     &Apache::loncommon::content_type($r,'text/html');
                    374: 	     $r->header_out(Location => 
1.71      albertel  375: 			    &Apache::lonnet::absolute_url().$newloc);
1.54      albertel  376: 	     
                    377: 	     return REDIRECT;
                    378: 	 }
1.10      www       379:       }
1.2       www       380:       $currenturl=~s/^http\:\/\///;
                    381:       $currenturl=~s/^[^\/]+//;
1.35      www       382: #
                    383: # Is the current URL on the map? If not, start with last known URL
                    384: #
                    385:       unless (&Apache::lonnet::is_on_map($currenturl)) {
1.7       www       386: 	 my $last;
1.53      albertel  387:          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28      albertel  388:                     &GDBM_READER(),0640)) {
1.7       www       389: 	     $last=$hash{'last_known'};
                    390:              untie(%hash);
                    391:          }
                    392:          if ($last) {
1.52      albertel  393: 	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7       www       394: 	 } else {
1.54      albertel  395: 	     if ($direction eq 'return') {
                    396: 		 &Apache::loncommon::content_type($r,'text/html');
                    397: 		 $r->header_out(Location => 
1.71      albertel  398: 				&Apache::lonnet::absolute_url().
1.70      albertel  399: 				'/adm/noidea.html');
1.54      albertel  400: 		 return REDIRECT;
                    401: 	     } else {
                    402: 		 &navlaunch($r);
                    403: 		 return OK;
                    404: 	     }
1.7       www       405:          }
                    406:       }
1.3       www       407: # ------------------------------------------- Do we have any idea where we are?
                    408:       my $position;
                    409:       if ($position=Apache::lonnet::symbread($currenturl)) {
                    410: # ------------------------------------------------------------------------- Yes
1.41      www       411: 	  my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52      albertel  412:           $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23      www       413:           $cachehash{$startoutmap}{'last_known'}=
1.52      albertel  414:                              [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20      albertel  415: 
1.5       www       416: # ============================================================ Tie the big hash
1.53      albertel  417:           if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel  418:                         &GDBM_READER(),0640)) {
1.29      www       419:               my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
                    420:                       '.'.$mapnum;
1.14      www       421: 
1.15      www       422: # ------------------------------------------------- Move forward, backward, etc
1.22      www       423:               my $endupmap;
                    424:               ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15      www       425: # -------------------------------------- Do we have one and only one empty URL?
1.22      www       426: # We are now at at least one non-empty URL
1.4       www       427: # ----------------------------------------------------- Check out possibilities
                    428:               if ($next) {
                    429:                   @possibilities=split(/\,/,$next);
                    430:                   if ($#possibilities==0) {
1.5       www       431: # ---------------------------------------------- Only one possibility, redirect
1.56      albertel  432: 	              ($redirecturl,$redirectsymb)=&hash_src($next);
1.52      albertel  433:                       $cachehash{$endupmap}{$redirecturl}=
                    434: 			  [$redirecturl,(split(/\./,$next))[1]];
1.4       www       435:                   } else {
1.5       www       436: # ------------------------ There are multiple possibilities for a next resource
                    437:                       $multichoice=1;
1.62      albertel  438: 		      foreach my $id (@possibilities) {
                    439: 			  $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
                    440:                           $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
                    441:                           $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
                    442:                           (my $first, my $second) = $id =~ /(\d+).(\d+)/;
                    443:                           my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
                    444:                           $multichoicehash{'symb_'.$id} = 
1.32      bowersj2  445:                               Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
                    446:                                                         $second.'___'.$symbSrc);
                    447:                                                          
1.62      albertel  448:                           my ($choicemap,$choiceres)=split(/\./,$id);
1.52      albertel  449: 			  my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62      albertel  450: 			  my $url=$multichoicehash{'src_'.$id};
1.52      albertel  451:                           $cachehash{$map}{$url}=[$url,$choiceres];
1.62      albertel  452:                       }
1.4       www       453:                   }
1.5       www       454: 	      } else {
                    455: # -------------------------------------------------------------- No place to go
                    456:                   $multichoice=-1;
1.4       www       457:               }
1.5       www       458: # ----------------- The program must come past this point to untie the big hash
1.3       www       459: 	      untie(%hash);
1.5       www       460: # --------------------------------------------------------- Store position info
1.52      albertel  461:               $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.19      www       462:               foreach my $thismap (keys %cachehash) {
1.52      albertel  463: 		  my $mapnum=$cachehash{$thismap}->{'mapnum'};
                    464: 		  delete($cachehash{$thismap}->{'mapnum'});
                    465: 		  &Apache::lonnet::symblist($thismap,
                    466: 					    %{$cachehash{$thismap}});
1.19      www       467: 	      }
1.5       www       468: # ============================================== Do not return before this line
1.4       www       469:               if ($redirecturl) {
1.5       www       470: # ----------------------------------------------------- There is a URL to go to
1.38      www       471: 		  if ($direction eq 'forward') {
                    472:                      &Apache::lonnet::linklog($currenturl,$redirecturl);
                    473: 		  }
                    474: 		  if ($direction eq 'back') {
                    475:                      &Apache::lonnet::linklog($redirecturl,$currenturl);
                    476: 		  }
1.31      www       477: # ------------------------------------------------- Check for critical messages
1.53      albertel  478: 		  if ((time-$env{'user.criticalcheck.time'})>300) {
1.31      www       479:                      my @what=&Apache::lonnet::dump
1.53      albertel  480:                                   ('critical',$env{'user.domain'},
                    481:                                               $env{'user.name'});
1.31      www       482:                      if ($what[0]) {
                    483: 	                if (($what[0] ne 'con_lost') && 
                    484:                             ($what[0]!~/^error\:/)) {
                    485: 	                   $redirecturl='/adm/email?critical=display';
1.56      albertel  486: 			   $redirectsymb='';
1.31      www       487:                         }
                    488:                      }
1.75      raeburn   489:                      &Apache::lonnet::appenv({'user.criticalcheck.time'=>time});
1.31      www       490: 		  }
                    491: 
1.51      albertel  492: 		  &Apache::loncommon::content_type($r,'text/html');
1.71      albertel  493: 		  my $url=&Apache::lonnet::absolute_url().$redirecturl;
1.66      albertel  494: 		  $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.56      albertel  495:                   $r->header_out(Location => $url);
1.4       www       496:                   return REDIRECT;
1.5       www       497: 	      } else {
                    498: # --------------------------------------------------------- There was a problem
1.51      albertel  499:                   &Apache::loncommon::content_type($r,'text/html');
1.8       www       500:                   $r->send_http_header;
1.59      www       501: 		  my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
                    502: 						     'explain' =>
                    503: 						     'You have reached the end of the sequence of materials.',
                    504: 						     'back' => 'Go Back',
                    505: 						     'nav' => 'Navigate Course Content',
                    506: 						     'wherenext' =>
                    507: 						     'There are several possibilities of where to go next',
                    508: 						     'pick' =>
                    509: 						     'Please click on the the resource you intend to access',
                    510: 						     'titleheader' => 'Title',
                    511: 						     'type' => 'Type');
1.8       www       512:                   if ($#possibilities>0) {
1.67      albertel  513: 		      my $start_page=
                    514: 			  &Apache::loncommon::start_page('Multiple Resources');
1.8       www       515:                      $r->print(<<ENDSTART);
1.67      albertel  516: $start_page
1.59      www       517: <h3>$lt{'wherenext'}</h3>
1.8       www       518: <p>
1.59      www       519: $lt{'pick'}:
1.8       www       520: <p>
                    521: <table border=2>
1.59      www       522: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8       www       523: ENDSTART
1.62      albertel  524:                      foreach my $id (@possibilities) {
1.8       www       525:                         $r->print(
                    526:                               '<tr><td><a href="'.
1.66      albertel  527: 				  &add_get_param($multichoicehash{'src_'.$id},
                    528: 						 {'symb' =>
                    529: 						      $multichoicehash{'symb_'.$id},
                    530: 						  }).'">'.
1.62      albertel  531:                               $multichoicehash{'title_'.$id}.
                    532:                               '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8       www       533: 			      '</td></tr>');
1.26      www       534:                      }
1.59      www       535:                      $r->print('</table>');
1.8       www       536:                   } else {
1.67      albertel  537: 		      my $start_page=
                    538: 			  &Apache::loncommon::start_page('No Resource');
1.59      www       539: 		      $r->print(<<ENDNONE);
1.67      albertel  540: $start_page
1.59      www       541: <h3>$lt{'title'}</h3>
                    542: <p>$lt{'explain'}</p>
                    543: ENDNONE
                    544: 		  }
                    545: 		  $r->print(<<ENDMENU);
1.37      www       546: <ul>
1.59      www       547: <li><a href="/adm/flip?postdata=return:">$lt{'back'}</a></li>
                    548: <li><a href="/adm/navmaps">$lt{'nav'}</a></li>
1.67      albertel  549: </ul>
1.59      www       550: ENDMENU
1.67      albertel  551:                   $r->print(&Apache::loncommon::end_page());
1.59      www       552:                   return OK;
                    553: 	      }
1.5       www       554: 	  } else {
                    555: # ------------------------------------------------- Problem, could not tie hash
1.53      albertel  556:               $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5       www       557:               return HTTP_NOT_ACCEPTABLE; 
1.3       www       558:           }
1.5       www       559:       } else {
                    560: # ---------------------------------------- No, could not determine where we are
1.42      albertel  561: 	  $r->internal_redirect('/adm/ambiguous');
1.2       www       562:       }
1.5       www       563:   } else {
1.2       www       564: # -------------------------- Class was not initialized or page fliped strangely
1.53      albertel  565:       $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2       www       566:       return HTTP_NOT_ACCEPTABLE; 
                    567:   } 
1.1       www       568: }
                    569: 
                    570: 1;
                    571: __END__
                    572: 
                    573: 
                    574: 
                    575: 
                    576: 
                    577: 
                    578: 

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