Annotation of rat/lonpageflip.pm, revision 1.89

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Page flip handler
                      4: #
1.89    ! raeburn     5: # $Id: lonpageflip.pm,v 1.80.8.7 2015/03/14 22:29:25 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: 
                     31: 
1.1       www        32: package Apache::lonpageflip;
                     33: 
                     34: use strict;
1.68      albertel   35: use LONCAPA;
1.4       www        36: use Apache::Constants qw(:common :http REDIRECT);
1.53      albertel   37: use Apache::lonnet;
1.70      albertel   38: use Apache::loncommon();
1.87      raeburn    39: use Apache::lonuserstate;
1.84      raeburn    40: use Apache::lonlocal;
1.1       www        41: use HTML::TokeParser;
                     42: use GDBM_File;
                     43: 
1.3       www        44: # ========================================================== Module Global Hash
                     45:   
1.1       www        46: my %hash;
1.34      www        47: 
                     48: sub cleanup {
                     49:     if (tied(%hash)){
                     50: 	&Apache::lonnet::logthis('Cleanup pageflip: hash');
                     51:         unless (untie(%hash)) {
                     52: 	    &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
                     53:         }
                     54:     }
1.63      albertel   55:     return OK;
1.34      www        56: }
1.1       www        57: 
1.3       www        58: sub addrid {
1.4       www        59:     my ($current,$new,$condid)=@_;
                     60:     unless ($condid) { $condid=0; }
1.27      www        61: 
1.3       www        62: 	if ($current) {
1.5       www        63: 	    $current.=','.$new;
1.3       www        64:         } else {
1.5       www        65:             $current=''.$new;
1.3       www        66:         }
1.27      www        67: 
1.3       www        68:     return $current;
1.25      www        69: }
                     70: 
                     71: sub fullmove {
                     72:     my ($rid,$mapurl,$direction)=@_;
1.53      albertel   73:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel   74:                         &GDBM_READER(),0640)) {
1.25      www        75: 	($rid,$mapurl)=&move($rid,$mapurl,$direction);
                     76:         untie(%hash);
                     77:     }
                     78:     return($rid,$mapurl);
1.1       www        79: }
                     80: 
1.50      albertel   81: sub hash_src {
                     82:     my ($id)=@_;
1.56      albertel   83:     my ($mapid,$resid)=split(/\./,$id);
                     84:     my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                     85: 					  $resid,$hash{'src_'.$id});
1.50      albertel   86:     if ($hash{'encrypted_'.$id}) {
1.56      albertel   87: 	return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
                     88: 		&Apache::lonenc::encrypted($symb));
1.50      albertel   89:     }
1.56      albertel   90:     return ($hash{'src_'.$id},$symb);
1.50      albertel   91: }
                     92: 
1.15      www        93: sub move {
1.72      albertel   94:     my ($next,$endupmap,$direction) = @_;
                     95:     my $safecount=0;
                     96:     my $allowed=0;
                     97:     do {
                     98: 	($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
                     99: 
                    100: 	my $url = $hash{'src_'.$next};
                    101: 	my ($mapid,$resid)=split(/\./,$next);
                    102: 	my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    103: 						$resid,$url);
                    104: 	if ($url eq '' || $symb eq '') {
                    105: 	    $allowed = 0;
                    106: 	} else {
                    107: 	    my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
                    108: 	    $allowed = (($priv eq 'F') || ($priv eq '2'));
                    109: 	}
                    110: 	$safecount++;
                    111:     } while (   ($next)
                    112: 	     && ($next!~/\,/)
                    113: 	     && (
                    114: 		    (!$hash{'src_'.$next})
                    115: 		 || (
                    116: 		        (!$env{'request.role.adv'})
                    117: 		     &&  $hash{'randomout_'.$next}
                    118: 		    )
                    119: 		 || (!$allowed)
                    120: 		)
                    121: 	     && ($safecount<10000));
                    122: 
                    123:     return ($next,$endupmap);
                    124: }
                    125: 
                    126: sub get_next_possible_move {
1.15      www       127:     my ($rid,$mapurl,$direction)=@_;
1.23      www       128:     my $startoutrid=$rid;
1.15      www       129: 
                    130:     my $next='';
                    131: 
                    132:               my $mincond=1;
                    133:               my $posnext='';
                    134:               if ($direction eq 'forward') {
                    135: # --------------------------------------------------------------------- Forward
1.33      www       136:                   while ($hash{'type_'.$rid} eq 'finish') {
                    137: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15      www       138:                   }
1.61      albertel  139: 		  foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.64      albertel  140: 		     my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
                    141: 		     my $rescond  = &Apache::lonnet::docondval($condition);
                    142: 		     my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
                    143: 		     my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
                    144: 		     if ($thiscond>=$mincond) {
1.15      www       145: 		          if ($posnext) {
1.61      albertel  146: 		             $posnext.=','.$id.':'.$thiscond;
1.15      www       147:                           } else {
1.61      albertel  148:                              $posnext=$id.':'.$thiscond;
1.15      www       149: 		          }
                    150:                           if ($thiscond>$mincond) { $mincond=$thiscond; }
                    151: 	              }
1.61      albertel  152:                   } 
                    153: 		  foreach my $id (split(/\,/,$posnext))  {
                    154:                       my ($linkid,$condval)=split(/\:/,$id);
1.15      www       155:                       if ($condval>=$mincond) {
                    156: 		          $next=&addrid($next,$hash{'goesto_'.$linkid},
                    157:                                 $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    158:                       }
1.61      albertel  159:                   }
1.15      www       160:                   if ($hash{'is_map_'.$next}) {
1.23      www       161: # This jumps to the beginning of a new map (going down level)
1.15      www       162:                       if (
                    163:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    164: 			  $mapurl=$hash{'src_'.$next};
                    165: 			  $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47      raeburn   166:                      } elsif (
                    167: # This jumps back up from an empty sequence, to a page up one level
                    168:                          $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    169:                          $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       170:                      }
1.23      www       171:                   } elsif 
                    172:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    173: # This comes up from a map (coming up one level);
                    174: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61      albertel  175: 		  }
1.15      www       176:               } elsif ($direction eq 'back') {
                    177: # ------------------------------------------------------------------- Backwards
1.33      www       178:                  while ($hash{'type_'.$rid} eq 'start') {
                    179: 	             $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
                    180: 		 }
1.62      albertel  181: 		 foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
1.64      albertel  182: 		     my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
                    183: 		     my $rescond  = &Apache::lonnet::docondval($condition);
                    184: 		     my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
                    185: 		     my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
1.62      albertel  186: 		     if ($thiscond>=$mincond) {
                    187: 			 if ($posnext) {
                    188: 		             $posnext.=','.$id.':'.$thiscond;
                    189: 			 } else {
                    190:                              $posnext=$id.':'.$thiscond;
                    191: 			 }
                    192: 			 if ($thiscond>$mincond) { $mincond=$thiscond; }
                    193: 		     }
                    194: 		 } 
                    195: 		 foreach my $id (split(/\,/,$posnext)) {
                    196: 		     my ($linkid,$condval)=split(/\:/,$id);
                    197: 		     if ($condval>=$mincond) {
                    198: 			 $next=&addrid($next,$hash{'comesfrom_'.$linkid},
                    199: 				       $hash{'condid_'.$hash{'undercond_'.$linkid}});
                    200: 		     }
                    201: 		 }
1.15      www       202:                   if ($hash{'is_map_'.$next}) {
1.24      www       203: # This jumps to the end of a new map (going down one level)
1.15      www       204:                       if (
                    205:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
                    206: 			  $mapurl=$hash{'src_'.$next};
                    207: 			  $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47      raeburn   208:                       } elsif (
                    209:       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
                    210: # This jumps back up from an empty sequence, to a page up one level
                    211:                           $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
                    212:                       }
1.24      www       213:                   } elsif 
                    214:                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
                    215: # This comes back up from a map (going up one level);
                    216: 		      $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15      www       217:                   }
                    218: 	      }
                    219:               return ($next,$mapurl);
                    220: }
                    221: 
1.69      www       222: sub first_accessible_resource {
                    223:     my $furl;
                    224:     if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
                    225: 	    &GDBM_READER(),0640)) {
                    226: 	$furl=$hash{'first_url'};
1.74      albertel  227: 	my %args;
                    228: 	my ($url,$args) = split(/\?/,$furl);
                    229: 	foreach my $pair (split(/\&/,$args)) {
                    230: 	    my ($name,$value) = split(/=/,$pair);
                    231: 	    $args{&unescape($name)} = &unescape($value);
                    232: 	}
                    233:         if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
1.69      www       234: # Wow, we cannot see this ... move forward to the next one that we can see
                    235: 	    my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
                    236: # Build the new URL
1.73      albertel  237: 	    my ($newmapid,$newresid)=split(/\./,$newrid);
1.69      www       238: 	    my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
                    239: 	    $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
                    240: 	    if ($hash{'encrypted_'.$newrid}) {
                    241: 		$furl=&Apache::lonenc::encrypted($furl);
                    242: 	    }
                    243: 	}
                    244: 	untie(%hash);
                    245: 	return $furl;
                    246:     } else {
                    247: 	return '/adm/navmaps';
                    248:     }
                    249: }
                    250: 
1.1       www       251: # ================================================================ Main Handler
                    252: 
                    253: sub handler {
1.2       www       254:    my $r=shift;
1.1       www       255: 
                    256: # ------------------------------------------- Set document type for header only
                    257: 
1.2       www       258:   if ($r->header_only) {
1.51      albertel  259:       &Apache::loncommon::content_type($r,'text/html');
                    260:       $r->send_http_header;
                    261:       return OK;
1.2       www       262:   }
                    263: 
1.5       www       264:   my %cachehash=(); 
                    265:   my $multichoice=0;
                    266:   my %multichoicehash=();
1.56      albertel  267:   my ($redirecturl,$redirectsymb);
1.4       www       268:   my $next='';
                    269:   my @possibilities=();
1.37      www       270:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53      albertel  271:   if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
1.88      raeburn   272:       my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
1.89    ! raeburn   273:       if ($currenturl=~m|^/enc/|) {
        !           274:           $currenturl=&Apache::lonenc::unencrypted($currenturl);
        !           275:       }
        !           276:       $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
        !           277:       $currenturl=~s/^https?\:\/\///;
        !           278:       $currenturl=~s/^[^\/]+//;
        !           279:       my ($preupdatepos,$last,$reinitcheck);
        !           280:       if ($direction eq 'return') {
        !           281:           if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
        !           282:                     &GDBM_READER(),0640)) {
        !           283:               $last=$hash{'last_known'};
        !           284:               untie(%hash);
        !           285:           }
        !           286:       }
1.87      raeburn   287:       if ($env{'request.course.id'}) {
                    288:           # Check if course needs to be re-initialized
                    289:           my $loncaparev = $r->dir_config('lonVersion');
1.89    ! raeburn   290:           ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
        !           291:           if ($reinitcheck eq 'switch') {
1.87      raeburn   292:               &Apache::loncommon::content_type($r,'text/html');
                    293:               $r->send_http_header;
                    294:               $r->print(&Apache::loncommon::check_release_result(@reinit));
                    295:               return OK;
1.89    ! raeburn   296:           } elsif ($reinitcheck eq 'update') {
1.87      raeburn   297:               my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
                    298:               my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1.89    ! raeburn   299:               $preupdatepos = &Apache::lonnet::symbread($currenturl);
        !           300:               unless ($direction eq 'return') {
        !           301:                   if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
        !           302:                                 &GDBM_READER(),0640)) {
        !           303:                       $last=$hash{'last_known'};
        !           304:                       untie(%hash);
        !           305:                   }
        !           306:               }
1.87      raeburn   307:               my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
                    308:               if ($ferr) {
                    309:                   my $requrl = $r->uri;
                    310:                   $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
                    311:                   $env{'user.reinit'} = 1;
                    312:                   return HTTP_NOT_ACCEPTABLE;
1.89    ! raeburn   313:               } else {
        !           314:                   if ($last) {
        !           315:                       my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
        !           316:                       unless (&Apache::lonnet::symbverify($last,$fn)) {
        !           317:                           undef($last);
        !           318:                       }
        !           319:                   }
1.87      raeburn   320:               }
                    321:           }
                    322:       }
1.54      albertel  323:       if ($direction eq 'firstres') {
1.69      www       324: 	  my $furl=&first_accessible_resource();
1.54      albertel  325: 	  &Apache::loncommon::content_type($r,'text/html');
                    326: 	  $r->header_out(Location => 
1.71      albertel  327: 			 &Apache::lonnet::absolute_url().$furl);
1.54      albertel  328: 	     
                    329: 	  return REDIRECT;
                    330:       }
1.89    ! raeburn   331:       if ($direction eq 'return') { 
1.10      www       332: # -------------------------------------------------------- Return to last known
                    333:          my $newloc;
1.53      albertel  334:          if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36      www       335:                         &GDBM_READER(),0640))) {
1.52      albertel  336:             my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50      albertel  337: 	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
                    338: 	    $newloc=$hash{'src_'.$id};
                    339: 	    if ($newloc) {
                    340: 		if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
                    341: 	    } else {
1.57      www       342: 		$newloc='/adm/navmaps';
1.50      albertel  343: 	    }
1.36      www       344:             untie %hash;
1.10      www       345:          } else {
1.57      www       346: 	    $newloc='/adm/navmaps';
1.89    ! raeburn   347:          }
        !           348: 	 &Apache::loncommon::content_type($r,'text/html');
        !           349: 	 $r->header_out(Location => 
        !           350: 			&Apache::lonnet::absolute_url().$newloc);
1.54      albertel  351: 	     
1.89    ! raeburn   352: 	 return REDIRECT;
1.10      www       353:       }
1.35      www       354: #
                    355: # Is the current URL on the map? If not, start with last known URL
                    356: #
1.89    ! raeburn   357: 
1.35      www       358:       unless (&Apache::lonnet::is_on_map($currenturl)) {
1.89    ! raeburn   359:          if ($preupdatepos) {
        !           360:              undef($preupdatepos);
        !           361:          } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
        !           362:                             &GDBM_READER(),0640)) {
        !           363:              $last=$hash{'last_known'};
1.7       www       364:              untie(%hash);
                    365:          }
1.89    ! raeburn   366:          my $newloc;
1.7       www       367:          if ($last) {
1.52      albertel  368: 	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7       www       369: 	 } else {
1.89    ! raeburn   370: 	     &Apache::loncommon::content_type($r,'text/html');
        !           371: 	     $r->header_out(Location => 
        !           372: 			    &Apache::lonnet::absolute_url().
        !           373: 			    '/adm/navmaps');
        !           374: 	     return REDIRECT;
1.7       www       375:          }
                    376:       }
1.3       www       377: # ------------------------------------------- Do we have any idea where we are?
                    378:       my $position;
1.89    ! raeburn   379:       if ($preupdatepos) {
        !           380:           $position = $preupdatepos;
        !           381:       } else {
        !           382:           $position=Apache::lonnet::symbread($currenturl);
        !           383:       }
        !           384:       if ($position) {
1.3       www       385: # ------------------------------------------------------------------------- Yes
1.41      www       386: 	  my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52      albertel  387:           $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23      www       388:           $cachehash{$startoutmap}{'last_known'}=
1.52      albertel  389:                              [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20      albertel  390: 
1.5       www       391: # ============================================================ Tie the big hash
1.53      albertel  392:           if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28      albertel  393:                         &GDBM_READER(),0640)) {
1.29      www       394:               my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
                    395:                       '.'.$mapnum;
1.14      www       396: 
1.15      www       397: # ------------------------------------------------- Move forward, backward, etc
1.22      www       398:               my $endupmap;
                    399:               ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15      www       400: # -------------------------------------- Do we have one and only one empty URL?
1.22      www       401: # We are now at at least one non-empty URL
1.4       www       402: # ----------------------------------------------------- Check out possibilities
                    403:               if ($next) {
                    404:                   @possibilities=split(/\,/,$next);
                    405:                   if ($#possibilities==0) {
1.5       www       406: # ---------------------------------------------- Only one possibility, redirect
1.56      albertel  407: 	              ($redirecturl,$redirectsymb)=&hash_src($next);
1.52      albertel  408:                       $cachehash{$endupmap}{$redirecturl}=
                    409: 			  [$redirecturl,(split(/\./,$next))[1]];
1.4       www       410:                   } else {
1.5       www       411: # ------------------------ There are multiple possibilities for a next resource
                    412:                       $multichoice=1;
1.62      albertel  413: 		      foreach my $id (@possibilities) {
                    414: 			  $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
                    415:                           $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
                    416:                           $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
                    417:                           (my $first, my $second) = $id =~ /(\d+).(\d+)/;
                    418:                           my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
                    419:                           $multichoicehash{'symb_'.$id} = 
1.32      bowersj2  420:                               Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
                    421:                                                         $second.'___'.$symbSrc);
                    422:                                                          
1.62      albertel  423:                           my ($choicemap,$choiceres)=split(/\./,$id);
1.52      albertel  424: 			  my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62      albertel  425: 			  my $url=$multichoicehash{'src_'.$id};
1.52      albertel  426:                           $cachehash{$map}{$url}=[$url,$choiceres];
1.62      albertel  427:                       }
1.4       www       428:                   }
1.5       www       429: 	      } else {
                    430: # -------------------------------------------------------------- No place to go
                    431:                   $multichoice=-1;
1.4       www       432:               }
1.5       www       433: # ----------------- The program must come past this point to untie the big hash
1.3       www       434: 	      untie(%hash);
1.5       www       435: # --------------------------------------------------------- Store position info
1.52      albertel  436:               $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.86      raeburn   437:               foreach my $thismap (keys(%cachehash)) {
1.52      albertel  438: 		  my $mapnum=$cachehash{$thismap}->{'mapnum'};
                    439: 		  delete($cachehash{$thismap}->{'mapnum'});
                    440: 		  &Apache::lonnet::symblist($thismap,
                    441: 					    %{$cachehash{$thismap}});
1.19      www       442: 	      }
1.5       www       443: # ============================================== Do not return before this line
1.4       www       444:               if ($redirecturl) {
1.5       www       445: # ----------------------------------------------------- There is a URL to go to
1.38      www       446: 		  if ($direction eq 'forward') {
                    447:                      &Apache::lonnet::linklog($currenturl,$redirecturl);
                    448: 		  }
                    449: 		  if ($direction eq 'back') {
                    450:                      &Apache::lonnet::linklog($redirecturl,$currenturl);
                    451: 		  }
1.85      musolffc  452: # ------------------------------------- Check for and display critical messages
                    453:                   my ($redirect, $url) = &Apache::loncommon::critical_redirect(300);
1.89    ! raeburn   454:                   unless ($redirect) {
1.85      musolffc  455:                       $url=&Apache::lonnet::absolute_url().$redirecturl;
1.89    ! raeburn   456:                       $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.85      musolffc  457:                   }
1.89    ! raeburn   458:                   &Apache::loncommon::content_type($r,'text/html');
1.56      albertel  459:                   $r->header_out(Location => $url);
1.4       www       460:                   return REDIRECT;
1.5       www       461: 	      } else {
                    462: # --------------------------------------------------------- There was a problem
1.51      albertel  463:                   &Apache::loncommon::content_type($r,'text/html');
1.8       www       464:                   $r->send_http_header;
1.59      www       465: 		  my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
                    466: 						     'explain' =>
                    467: 						     'You have reached the end of the sequence of materials.',
                    468: 						     'back' => 'Go Back',
1.83      raeburn   469: 						     'nav' => 'Course Contents',
1.59      www       470: 						     'wherenext' =>
                    471: 						     'There are several possibilities of where to go next',
                    472: 						     'pick' =>
                    473: 						     'Please click on the the resource you intend to access',
                    474: 						     'titleheader' => 'Title',
1.89    ! raeburn   475: 						     'type' => 'Type',
        !           476:                                                      'update' => 'Content updated',
        !           477:                                                      'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
        !           478:                                                      'gonav' => 'Go to the Contents page to select a resource to display.');
1.83      raeburn   479:                   if (&Apache::loncommon::course_type() eq 'Community') {
                    480:                       $lt{'nav'} = &mt('Community Contents');
                    481:                   }
1.8       www       482:                   if ($#possibilities>0) {
1.67      albertel  483: 		      my $start_page=
                    484: 			  &Apache::loncommon::start_page('Multiple Resources');
1.8       www       485:                      $r->print(<<ENDSTART);
1.67      albertel  486: $start_page
1.59      www       487: <h3>$lt{'wherenext'}</h3>
1.8       www       488: <p>
1.59      www       489: $lt{'pick'}:
1.8       www       490: <p>
1.79      bisitz    491: <table border="2">
1.59      www       492: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8       www       493: ENDSTART
1.62      albertel  494:                      foreach my $id (@possibilities) {
1.8       www       495:                         $r->print(
                    496:                               '<tr><td><a href="'.
1.66      albertel  497: 				  &add_get_param($multichoicehash{'src_'.$id},
                    498: 						 {'symb' =>
                    499: 						      $multichoicehash{'symb_'.$id},
                    500: 						  }).'">'.
1.62      albertel  501:                               $multichoicehash{'title_'.$id}.
                    502:                               '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8       www       503: 			      '</td></tr>');
1.26      www       504:                      }
1.59      www       505:                      $r->print('</table>');
1.8       www       506:                   } else {
1.89    ! raeburn   507:                       if ($reinitcheck) {
        !           508:                           if (&Apache::loncommon::course_type() eq 'Community') {
        !           509:                               $r->print(
        !           510:                                   &Apache::loncommon::start_page('Community Contents Updated'));
        !           511:                           } else { 
        !           512:                               $r->print(
        !           513:                                   &Apache::loncommon::start_page('Course Contents Updated'));
        !           514:                           }
        !           515:                           $r->print('<h2>'.$lt{'update'}.'</h2>'
        !           516:                                   .'<p>'.$lt{'expupdate'}.'<br />'
        !           517:                                   .$lt{'gonav'}.'</p>');
        !           518:                       } else {
        !           519:                           $r->print(
        !           520:                               &Apache::loncommon::start_page('No Resource')
        !           521:                              .'<h2>'.$lt{'title'}.'</h2>'
        !           522:                              .'<p>'.$lt{'explain'}.'</p>');
        !           523:                       }
        !           524: 		  }
        !           525:                   if ((!@possibilities) && ($reinitcheck))  {
        !           526:                       $r->print(
        !           527:                           &Apache::lonhtmlcommon::actionbox(
        !           528:                               ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
        !           529:                               ]));
        !           530:                   } else {
1.82      bisitz    531:                       $r->print(
1.89    ! raeburn   532:                           &Apache::lonhtmlcommon::actionbox(
        !           533:                               ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
        !           534:                                '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
        !           535:                               ]));
1.82      bisitz    536:                   }
1.89    ! raeburn   537:                   $r->print(&Apache::loncommon::end_page());
        !           538:       
1.59      www       539:                   return OK;
                    540: 	      }
1.5       www       541: 	  } else {
                    542: # ------------------------------------------------- Problem, could not tie hash
1.53      albertel  543:               $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5       www       544:               return HTTP_NOT_ACCEPTABLE; 
1.3       www       545:           }
1.5       www       546:       } else {
                    547: # ---------------------------------------- No, could not determine where we are
1.42      albertel  548: 	  $r->internal_redirect('/adm/ambiguous');
1.81      raeburn   549:           return OK;
1.2       www       550:       }
1.5       www       551:   } else {
1.2       www       552: # -------------------------- Class was not initialized or page fliped strangely
1.53      albertel  553:       $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2       www       554:       return HTTP_NOT_ACCEPTABLE; 
                    555:   } 
1.1       www       556: }
                    557: 
                    558: 1;
                    559: __END__
                    560: 
1.77      jms       561: =pod
                    562: 
                    563: =head1 NAME
                    564: 
                    565: Apache::lonpageflip
                    566: 
                    567: =head1 SYNOPSIS
                    568: 
                    569: Deals with forward, backward, and other page flips.
                    570: 
                    571: This is part of the LearningOnline Network with CAPA project
                    572: described at http://www.lon-capa.org.
                    573: 
                    574: =head1 OVERVIEW
                    575: 
                    576: (empty)
                    577: 
                    578: =head1 SUBROUTINES
                    579: 
                    580: =over cleanup()
                    581: 
                    582: =item addrid()
                    583: 
                    584: =item fullmove()
                    585: 
                    586: =item hash_src()
                    587: 
                    588: =item move()
                    589: 
                    590: =item get_next_possible_move()
                    591: 
                    592: =item first_accessible_resource()
                    593: 
                    594: =item handler()
                    595: 
                    596: =back
                    597: 
                    598: =cut
1.1       www       599: 
                    600: 
                    601: 
                    602: 
                    603: 
                    604: 

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