Annotation of rat/lonsequence.pm, revision 1.4

1.1       www         1: # The LearningOnline Network with CAPA
                      2: #
                      3: # Sequence Handler
                      4: #
                      5: # (Handler to resolve ambiguous file locations
                      6: #
                      7: # (TeX Content Handler
                      8: #
                      9: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
                     10: #
                     11: # 10/11,10/12 Gerd Kortemeyer)
                     12: #
                     13: # 10/16 Gerd Kortemeyer
                     14: 
1.3       www        15: package Apache::lonsequence;
1.1       www        16: 
                     17: use strict;
                     18: use Apache::lonnet;
1.3       www        19: use Apache::Constants qw(:common :http REDIRECT);
1.1       www        20: use GDBM_File;
                     21: 
                     22: 
                     23: # ----------------------------------------------------------- Could not resolve
                     24: 
                     25: sub getlost {
                     26:     my ($r,$errmsg)=@_;
                     27:     $r->content_type('text/html');
                     28:     $r->send_http_header;
                     29:     $r->print(
                     30:  '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
1.3       www        31:  'LON-CAPA</h1>Could not handle sequence resource reference.<p>'.$errmsg.
1.1       www        32:  '</body></html>');
                     33: }
                     34: 
                     35: # ================================================================ Main Handler
                     36: 
                     37: sub handler {
                     38:    my $r=shift;
                     39: 
                     40:    if ($r->header_only) {
                     41:       $r->content_type('text/html');
                     42:       $r->send_http_header;
                     43:       return OK;
                     44:    }
                     45: 
1.2       www        46:    my %hash;
1.1       www        47:    my %bighash;
1.2       www        48:    my $requrl=$r->uri;
                     49: 
1.3       www        50: # ------------------------------------------------------------ Tie symb db file
1.1       www        51:   if ($ENV{'request.course.fn'}) {
1.2       www        52:        my $last;
                     53:        if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
                     54:                     &GDBM_READER,0640)) {
                     55: 	   $last=$hash{'last_direction'};
                     56:            untie(%hash);
                     57:        }
1.3       www        58:        my $direction='';
                     59:        my $prevmap='';
                     60:        if ($last) {
                     61: 	  ($prevmap,$direction)=(split(/\_\_\_/,$last));
                     62:        }
                     63: # ------------------------------------------------------------- Tie big db file
1.1       www        64:        if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                     65:                     &GDBM_READER,0640)) {
1.3       www        66: 	   my $disid='';
1.4     ! www        67:            my $whatend='';
1.3       www        68:            if ($direction eq 'back') {
                     69: 	       $disid=$bighash{'map_finish_'.$requrl};
1.4     ! www        70:                $whatend='End';
1.3       www        71:            } else {
                     72:                $disid=$bighash{'map_start_'.$requrl};
1.4     ! www        73:                $whatend='Beginning';
1.3       www        74:            } 
                     75:            my $disurl='';
1.4     ! www        76:            my $dismapid='';
1.3       www        77:            if ($disid) {
                     78: 	       $disurl=$bighash{'src_'.$disid};
1.4     ! www        79:                $dismapid=(split(/\./,$disid))[1];
1.3       www        80:            }
                     81:            my $symb='';
1.4     ! www        82:            my $sequencetitle='';
1.3       www        83:            unless($disurl) {
                     84:                if ($symb=&Apache::lonnet::symbread()) {
1.4     ! www        85: 		   my ($mapurl,$mapid)=split(/\_\_\_/,$symb);
        !            86:                    $sequencetitle=$bighash{'title_'.
        !            87: 				          $bighash{'map_pc_/res/'.$mapurl}.'.'.
        !            88: 					  $mapid};
1.3       www        89:                }
                     90:            }
                     91: # --------------------------------------- Untie hash, make sure to come by here
                     92:            untie(%bighash);
                     93:            if ($disurl) {
                     94: # -------------------------------------------------- Has first or last resource
1.4     ! www        95:                &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
        !            96:                    'last_known' => &Apache::lonnet::declutter($disurl)); 
1.3       www        97: 	       $r->content_type('text/html');
                     98:                $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
                     99:                return REDIRECT;
                    100:            } else {
                    101: # ---------- Does not have first or last resource, try to find out where we are
                    102:                unless ($symb) {
                    103: 		   $r->internal_redirect('/adm/ambiguous');
                    104:                }
                    105:                $r->content_type('text/html');
                    106:                $r->send_http_header;
                    107:                $r->print(<<ENDSYMB);
1.4     ! www       108: <html><body bgcolor="#FFFFFF">
        !           109: <h2>$whatend of</h2>
        !           110: <h1>$sequencetitle</h1>
1.3       www       111: </body></html>
                    112: ENDSYMB
                    113:                return OK
1.2       www       114:            }
1.1       www       115:        } else {
                    116:           &getlost($r,'Could not access course structure.');
                    117:           return OK;
                    118:        }
                    119:    } else {
                    120:       $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
                    121:       return HTTP_NOT_ACCEPTABLE; 
                    122:    }
                    123: 
                    124:    return OK;
                    125: }
                    126: 
                    127: 1;
                    128: __END__
                    129: 
                    130: 
                    131: 
                    132: 
                    133: 
                    134: 
                    135: 

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