Annotation of rat/lonambiguous.pm, revision 1.2
1.1 www 1: # The LearningOnline Network with CAPA
2: # Handler to resolve ambiguous file locations
3: #
4: # (TeX Content Handler
5: #
6: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
7: #
1.2 ! www 8: # 10/11,10/12 Gerd Kortemeyer
1.1 www 9:
10: package Apache::lonambiguous;
11:
12: use strict;
13: use Apache::lonnet;
14: use Apache::Constants qw(:common REDIRECT);
15: use GDBM_File;
16:
17:
18: # ----------------------------------------------------------- Could not resolve
19:
20: sub getlost {
1.2 ! www 21: my ($r,$errmsg)=@_;
1.1 www 22: $r->content_type('text/html');
23: $r->send_http_header;
1.2 ! www 24: $r->print(
! 25: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
! 26: 'LON-CAPA</h1>Could not handle ambiguous resource reference.<p>'.$errmsg.
! 27: '</body></html>');
1.1 www 28: }
29:
30: # ================================================================ Main Handler
31:
32: sub handler {
33: my $r=shift;
34:
35: if ($r->header_only) {
36: $r->content_type('text/html');
37: $r->send_http_header;
38: return OK;
39: }
40:
1.2 ! www 41: # ---------------------------------------------------------- Is this selecting?
! 42:
! 43: my %bighash;
! 44:
! 45: if ($ENV{'form.selecturl'}) {
! 46: my $envkey;
! 47: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
! 48: &GDBM_READER,0640)) {
! 49: foreach $envkey (keys %ENV) {
! 50: if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
! 51: my $mapid=$1;
! 52: my $resid=$2;
! 53: my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
! 54: &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
! 55: $resurl => $resid);
! 56: $r->header_out(Location =>
! 57: 'http://'.$ENV{'HTTP_HOST'}.$resurl);
! 58: return REDIRECT;
! 59: }
! 60: }
! 61: untie(%bighash);
! 62: # ---------------------------------------------------- Update symb and redirect
! 63: } else {
! 64: &getlost($r,'Could not access course structure.');
! 65: return OK;
! 66: }
! 67: }
! 68:
1.1 www 69: # ---------------------------------------------------------- Do we have a case?
70:
71: my $thisfn;
72: unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) {
1.2 ! www 73: &getlost($r,'Could not find information on resource.');
1.1 www 74: return OK;
75: }
76:
77: # ---------------------------------- Should this file have been part of a page?
78:
79: $thisfn=&Apache::lonnet::declutter($thisfn);
80: my %hash;
81: my $syval='';
82:
83: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
84: &GDBM_READER,0640)) {
85: $syval=$hash{$thisfn};
86: untie(%hash);
87: }
1.2 ! www 88:
1.1 www 89: # ---------------------------------------------------------- There was an entry
1.2 ! www 90:
1.1 www 91: if ($syval) {
1.2 ! www 92:
1.1 www 93: if ($syval=~/\_$/) {
94: # ----------------------------------- Okay, this should have appeared on a page
95: $syval=~s/\_\_\_$//;
96: $r->content_type('text/html');
97: $r->header_out(Location =>
98: 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval);
99: return REDIRECT;
100: } else {
101: # There is not really a problem (???), but cannot go back without endless loop
1.2 ! www 102: &getlost($r,'The nature of the problem is unclear');
1.1 www 103: return OK;
104: }
105: }
106:
107: # ------------------------------------------------ Would be standalone resource
108:
109: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
110: &GDBM_READER,0640)) {
111: # ---------------------------------------------- Get ID(s) for current resource
112: my $ids=$bighash{'ids_/res/'.$thisfn};
113: if ($ids) {
114: # ------------------------------------------------------------------- Has ID(s)
115: my @possibilities=split(/\,/,$ids);
116: my $couldbe='';
117: map {
1.2 ! www 118: if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) {
1.1 www 119: if ($couldbe) {
120: $couldbe.=','.$_;
121: } else {
122: $couldbe=$_;
123: }
124: }
125: } @possibilities;
126: if ($couldbe) {
127: @possibilities=split(/\,/,$couldbe);
128: if ($#possibilities>0) {
129: # ----------------------------------------------- Okay, really multiple choices
130: $r->content_type('text/html');
131: $r->send_http_header;
1.2 ! www 132: $r->print(<<ENDSTART);
! 133: <head><title>Choose Location</title></head>
! 134: <body bgcolor="#FFFFFF">
! 135: <h1>LON-CAPA</h1>
! 136: The resource you had been accessing appears more than once in this course,
! 137: and LON-CAPA has insufficient session information to determine which instance
! 138: of the resource you meant.
! 139: <p>
! 140: Please click on the instance of the resource you intended to access:
! 141: <p>
! 142: <form action="/adm/ambiguous" method=post>
! 143: <input type=hidden name=orgurl value="$thisfn">
! 144: <input type=hidden name=selecturl value=1>
! 145: <table border=2>
! 146: <tr><th> </th><th>Title</th><th>Type</th><th>Part of ...</th></tr>
! 147: ENDSTART
! 148: map {
! 149: my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
! 150: $r->print('<tr><td><input type=submit value=Select name="'.
! 151: $_.'"></td><td>'.$bighash{'title_'.$_}.
! 152: '</td><td>'.$bighash{'type_'.$_}.
! 153: '</td><td><a href="'.$mapurl.'">'.$mapurl.
! 154: '</a></td></tr>');
! 155: } @possibilities;
! 156: $r->print('</table></form></body></html>');
1.1 www 157: untie(%bighash);
158: return OK;
159: }
160: }
161: }
162: untie(%bighash);
163: }
164:
165: # ------------------------------------ This handler should not have been called
1.2 ! www 166: &getlost($r,'Invalid call of handler');
1.1 www 167: return OK;
168: }
169:
170: 1;
171: __END__
172:
173:
174:
175:
176:
177:
178:
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