Annotation of rat/lonsequence.pm, revision 1.1
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:
! 15: package Apache::lonambiguous;
! 16:
! 17: use strict;
! 18: use Apache::lonnet;
! 19: use Apache::Constants qw(:common REDIRECT);
! 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: $r->print(
! 30: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
! 31: 'LON-CAPA</h1>Could not handle ambiguous resource reference.<p>'.$errmsg.
! 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: $r->send_http_header;
! 43: return OK;
! 44: }
! 45:
! 46: my %bighash;
! 47: # ----------------------------------------------------------------- Tie db file
! 48: if ($ENV{'request.course.fn'}) {
! 49: my $envkey;
! 50: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
! 51: &GDBM_READER,0640)) {
! 52: foreach $envkey (keys %ENV) {
! 53: if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
! 54: my $mapid=$1;
! 55: my $resid=$2;
! 56: my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
! 57: &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
! 58: $resurl => $resid);
! 59: $r->header_out(Location =>
! 60: 'http://'.$ENV{'HTTP_HOST'}.$resurl);
! 61: return REDIRECT;
! 62: }
! 63: }
! 64: untie(%bighash);
! 65: } else {
! 66: &getlost($r,'Could not access course structure.');
! 67: return OK;
! 68: }
! 69: } else {
! 70: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
! 71: return HTTP_NOT_ACCEPTABLE;
! 72: }
! 73:
! 74: return OK;
! 75:
! 76: # ================================================================= TRASH BELOW
! 77:
! 78: # ---------------------------------------------------------- Do we have a case?
! 79:
! 80: my $thisfn;
! 81: unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) {
! 82: &getlost($r,'Could not find information on resource.');
! 83: return OK;
! 84: }
! 85:
! 86: # ---------------------------------- Should this file have been part of a page?
! 87:
! 88: $thisfn=&Apache::lonnet::declutter($thisfn);
! 89: my %hash;
! 90: my $syval='';
! 91:
! 92: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
! 93: &GDBM_READER,0640)) {
! 94: $syval=$hash{$thisfn};
! 95: untie(%hash);
! 96: }
! 97:
! 98: # ---------------------------------------------------------- There was an entry
! 99:
! 100: if ($syval) {
! 101:
! 102: if ($syval=~/\_$/) {
! 103: # ----------------------------------- Okay, this should have appeared on a page
! 104: $syval=~s/\_\_\_$//;
! 105: $r->content_type('text/html');
! 106: $r->header_out(Location =>
! 107: 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval);
! 108: return REDIRECT;
! 109: } else {
! 110: # There is not really a problem (???), but cannot go back without endless loop
! 111: &getlost($r,'The nature of the problem is unclear');
! 112: return OK;
! 113: }
! 114: }
! 115:
! 116: # ------------------------------------------------ Would be standalone resource
! 117:
! 118: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
! 119: &GDBM_READER,0640)) {
! 120: # ---------------------------------------------- Get ID(s) for current resource
! 121: my $ids=$bighash{'ids_/res/'.$thisfn};
! 122: if ($ids) {
! 123: # ------------------------------------------------------------------- Has ID(s)
! 124: my @possibilities=split(/\,/,$ids);
! 125: my $couldbe='';
! 126: map {
! 127: if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) {
! 128: if ($couldbe) {
! 129: $couldbe.=','.$_;
! 130: } else {
! 131: $couldbe=$_;
! 132: }
! 133: }
! 134: } @possibilities;
! 135: if ($couldbe) {
! 136: @possibilities=split(/\,/,$couldbe);
! 137: if ($#possibilities>0) {
! 138: # ----------------------------------------------- Okay, really multiple choices
! 139: $r->content_type('text/html');
! 140: $r->send_http_header;
! 141: $r->print(<<ENDSTART);
! 142: <head><title>Choose Location</title></head>
! 143: <body bgcolor="#FFFFFF">
! 144: <h1>LON-CAPA</h1>
! 145: The resource you had been accessing appears more than once in this course,
! 146: and LON-CAPA has insufficient session information to determine which instance
! 147: of the resource you meant.
! 148: <p>
! 149: Please click on the instance of the resource you intended to access:
! 150: <p>
! 151: <form action="/adm/ambiguous" method=post>
! 152: <input type=hidden name=orgurl value="$thisfn">
! 153: <input type=hidden name=selecturl value=1>
! 154: <table border=2>
! 155: <tr><th> </th><th>Title</th><th>Type</th><th>Part of ...</th></tr>
! 156: ENDSTART
! 157: map {
! 158: my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
! 159: $r->print('<tr><td><input type=submit value=Select name="'.
! 160: $_.'"></td><td>'.$bighash{'title_'.$_}.
! 161: '</td><td>'.$bighash{'type_'.$_}.
! 162: '</td><td><a href="'.$mapurl.'">'.$mapurl.
! 163: '</a></td></tr>');
! 164: } @possibilities;
! 165: $r->print('</table></form></body></html>');
! 166: untie(%bighash);
! 167: return OK;
! 168: }
! 169: }
! 170: }
! 171: untie(%bighash);
! 172: }
! 173:
! 174: # ------------------------------------ This handler should not have been called
! 175: &getlost($r,'Invalid call of handler');
! 176: return OK;
! 177: }
! 178:
! 179: 1;
! 180: __END__
! 181:
! 182:
! 183:
! 184:
! 185:
! 186:
! 187:
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