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Annotation of rat/lonpageflip.pm, revision 1.4

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Page flip handler
                      4: #
                      5: # (Page Handler
                      6: #
                      7: # (TeX Content Handler
                      8: #
                      9: # 05/29/00,05/30 Gerd Kortemeyer)
                     10: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
                     11: # 10/02 Gerd Kortemeyer)
                     12: #
1.4     ! www        13: # 10/03,10/05,10/06,10/07,10/09 Gerd Kortemeyer
1.1       www        14: 
                     15: package Apache::lonpageflip;
                     16: 
                     17: use strict;
1.4     ! www        18: use Apache::Constants qw(:common :http REDIRECT);
1.1       www        19: use Apache::lonnet();
                     20: use HTML::TokeParser;
                     21: use GDBM_File;
                     22: 
1.3       www        23: # ========================================================== Module Global Hash
                     24:   
1.1       www        25: my %hash;
                     26: 
1.3       www        27: sub addrid {
1.4     ! www        28:     my ($current,$new,$condid)=@_;
        !            29:     unless ($condid) { $condid=0; }
1.3       www        30:     if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) {
                     31: 	if ($current) {
1.4     ! www        32: 	    $current.=','.$new.':'.$condid;
1.3       www        33:         } else {
1.4     ! www        34:             $current=''.$new.':'.$condid;
1.3       www        35:         }
1.1       www        36:     }
1.3       www        37:     return $current;
1.1       www        38: }
                     39: 
                     40: # ================================================================ Main Handler
                     41: 
                     42: sub handler {
1.2       www        43:    my $r=shift;
1.1       www        44: 
                     45: # ------------------------------------------- Set document type for header only
                     46: 
1.2       www        47:   if ($r->header_only) {
1.1       www        48:      $r->content_type('text/html');
                     49:      $r->send_http_header;
1.2       www        50:      return OK;
                     51:   }
                     52: 
1.3       www        53:   my %cachehash=();
1.4     ! www        54:   my $redirecturl='';
        !            55:   my $next='';
        !            56:   my @possibilities=();
1.2       www        57: 
                     58:   if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) {
                     59:       $ENV{'form.postdata'}=~/(\w+)\:(.*)/;
                     60:       my $direction=$1;
                     61:       my $currenturl=$2;
                     62:       my $redirecturl=$currenturl;
                     63:       $currenturl=~s/^http\:\/\///;
                     64:       $currenturl=~s/^[^\/]+//;
1.3       www        65: # ------------------------------------------- Do we have any idea where we are?
                     66:       my $position;
                     67:       if ($position=Apache::lonnet::symbread($currenturl)) {
                     68: # ------------------------------------------------------------------------- Yes
                     69: 	  my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position);
                     70:           $cachehash{$thisurl}=$mapnum;
                     71:           if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                     72:                         &GDBM_READER,0640)) {
                     73:               my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum;
                     74:               my $next='';
                     75:               if ($direction eq 'forward') {
                     76:                  map {
1.4     ! www        77: 		    $next=&addrid($next,$hash{'goesto_'.$_},
        !            78:                                   $hash{'condid_'.$hash{'undercond_'.$_}});
1.3       www        79:                   } split(/\,/,$hash{'to_'.$rid});
                     80:               } elsif ($direction eq 'back') {
1.4     ! www        81:                 map {
        !            82: 		    $next=&addrid($next,$hash{'comesfrom_'.$_},
        !            83:                                   $hash{'condid_'.$hash{'undercond_'.$_}});
        !            84:                   } split(/\,/,$hash{'from_'.$rid});
        !            85:  	      } elsif ($direction eq 'up') {
1.3       www        86:               } elsif ($direction eq 'down') {
                     87:               }
1.4     ! www        88:               my $redirectid='';
        !            89: # ----------------------------------------------------- Check out possibilities
        !            90:               if ($next) {
        !            91:                   @possibilities=split(/\,/,$next);
        !            92:                   if ($#possibilities==0) {
        !            93: 		      $redirectid=(split(/\:/,$next))[0];
        !            94:                   } else {
        !            95:                   }
        !            96: 	      }
        !            97:               if ($redirectid) {
        !            98: 		  $redirecturl=$hash{'src_'.$redirectid};
        !            99:               }
1.3       www       100: 	      untie(%hash);
1.4     ! www       101:               if ($redirecturl) {
        !           102: 		  $r->content_type('text/html');
        !           103:                   $r->header_out(Location => 
        !           104:                                 'http://'.$ENV{'HTTP_HOST'}.$redirecturl);
        !           105:                   return REDIRECT;
        !           106:               }
1.3       www       107:           }
1.2       www       108:       }
1.4     ! www       109: # -------------------------------------------------------- No, could not decide
        !           110:       }
        !           111:     $r->content_type('text/html');
        !           112:      $r->send_http_header;
        !           113: 
        !           114:   $r->print('<html><body>');
        !           115: 
1.2       www       116: # -------------------------- Class was not initialized or page fliped strangely
                    117:   } else {
                    118:       $ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
                    119:       return HTTP_NOT_ACCEPTABLE; 
                    120:   } 
1.1       www       121: 
                    122: 
                    123: 
                    124: 
1.2       www       125: # ------TRASH BELOW
                    126: # --------------------------- TRASH
1.1       www       127: 
1.2       www       128:   $r->print('</body></html>');
1.1       www       129:   return OK;
                    130: 
                    131: 
1.2       www       132: # ========================================================= TOTAL TRASH
1.1       www       133: 
1.3       www       134: #                  &Apache::lonnet::symblist($requrl,%symbhash);
1.1       www       135: 
                    136: }
                    137: 
                    138: 1;
                    139: __END__
                    140: 
                    141: 
                    142: 
                    143: 
                    144: 
                    145: 
                    146: