Annotation of rat/lonambiguous.pm, revision 1.4
1.1 www 1: # The LearningOnline Network with CAPA
2: # Handler to resolve ambiguous file locations
3: #
1.4 ! www 4: # $Id: gplheader.pl,v 1.1 2001/11/29 18:19:27 www Exp $
! 5: #
! 6: # Copyright Michigan State University Board of Trustees
! 7: #
! 8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
! 9: #
! 10: # LON-CAPA is free software; you can redistribute it and/or modify
! 11: # it under the terms of the GNU General Public License as published by
! 12: # the Free Software Foundation; either version 2 of the License, or
! 13: # (at your option) any later version.
! 14: #
! 15: # LON-CAPA is distributed in the hope that it will be useful,
! 16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
! 17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 18: # GNU General Public License for more details.
! 19: #
! 20: # You should have received a copy of the GNU General Public License
! 21: # along with LON-CAPA; if not, write to the Free Software
! 22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
! 23: #
! 24: # /home/httpd/html/adm/gpl.txt
! 25: #
! 26: # http://www.lon-capa.org/
! 27: #
1.1 www 28: # (TeX Content Handler
29: #
30: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
31: #
1.3 www 32: # 10/11,10/12,10/16 Gerd Kortemeyer
1.1 www 33:
34: package Apache::lonambiguous;
35:
36: use strict;
37: use Apache::lonnet;
38: use Apache::Constants qw(:common REDIRECT);
39: use GDBM_File;
40:
41:
42: # ----------------------------------------------------------- Could not resolve
43:
44: sub getlost {
1.2 www 45: my ($r,$errmsg)=@_;
1.1 www 46: $r->content_type('text/html');
47: $r->send_http_header;
1.2 www 48: $r->print(
49: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
50: 'LON-CAPA</h1>Could not handle ambiguous resource reference.<p>'.$errmsg.
51: '</body></html>');
1.1 www 52: }
53:
54: # ================================================================ Main Handler
55:
56: sub handler {
57: my $r=shift;
58:
59: if ($r->header_only) {
60: $r->content_type('text/html');
61: $r->send_http_header;
62: return OK;
63: }
64:
1.2 www 65: # ---------------------------------------------------------- Is this selecting?
66:
67: my %bighash;
68:
69: if ($ENV{'form.selecturl'}) {
70: my $envkey;
71: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
72: &GDBM_READER,0640)) {
73: foreach $envkey (keys %ENV) {
74: if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
1.3 www 75: # ---------------------------------------------------- Update symb and redirect
1.2 www 76: my $mapid=$1;
77: my $resid=$2;
78: my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
79: &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
80: $resurl => $resid);
1.3 www 81: untie(%bighash);
1.2 www 82: $r->header_out(Location =>
83: 'http://'.$ENV{'HTTP_HOST'}.$resurl);
84: return REDIRECT;
85: }
86: }
87: untie(%bighash);
88: } else {
89: &getlost($r,'Could not access course structure.');
90: return OK;
91: }
92: }
93:
1.1 www 94: # ---------------------------------------------------------- Do we have a case?
95:
96: my $thisfn;
97: unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) {
1.2 www 98: &getlost($r,'Could not find information on resource.');
1.1 www 99: return OK;
100: }
101:
102: # ---------------------------------- Should this file have been part of a page?
103:
104: $thisfn=&Apache::lonnet::declutter($thisfn);
105: my %hash;
106: my $syval='';
107:
108: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
109: &GDBM_READER,0640)) {
110: $syval=$hash{$thisfn};
111: untie(%hash);
112: }
1.2 www 113:
1.1 www 114: # ---------------------------------------------------------- There was an entry
1.2 www 115:
1.1 www 116: if ($syval) {
1.2 www 117:
1.1 www 118: if ($syval=~/\_$/) {
119: # ----------------------------------- Okay, this should have appeared on a page
120: $syval=~s/\_\_\_$//;
121: $r->content_type('text/html');
122: $r->header_out(Location =>
123: 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval);
124: return REDIRECT;
125: } else {
126: # There is not really a problem (???), but cannot go back without endless loop
1.2 www 127: &getlost($r,'The nature of the problem is unclear');
1.1 www 128: return OK;
129: }
130: }
131:
132: # ------------------------------------------------ Would be standalone resource
133:
134: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
135: &GDBM_READER,0640)) {
136: # ---------------------------------------------- Get ID(s) for current resource
137: my $ids=$bighash{'ids_/res/'.$thisfn};
138: if ($ids) {
139: # ------------------------------------------------------------------- Has ID(s)
140: my @possibilities=split(/\,/,$ids);
141: my $couldbe='';
142: map {
1.2 www 143: if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) {
1.1 www 144: if ($couldbe) {
145: $couldbe.=','.$_;
146: } else {
147: $couldbe=$_;
148: }
149: }
150: } @possibilities;
151: if ($couldbe) {
152: @possibilities=split(/\,/,$couldbe);
153: if ($#possibilities>0) {
154: # ----------------------------------------------- Okay, really multiple choices
155: $r->content_type('text/html');
156: $r->send_http_header;
1.2 www 157: $r->print(<<ENDSTART);
158: <head><title>Choose Location</title></head>
159: <body bgcolor="#FFFFFF">
160: <h1>LON-CAPA</h1>
161: The resource you had been accessing appears more than once in this course,
162: and LON-CAPA has insufficient session information to determine which instance
163: of the resource you meant.
164: <p>
165: Please click on the instance of the resource you intended to access:
166: <p>
167: <form action="/adm/ambiguous" method=post>
168: <input type=hidden name=orgurl value="$thisfn">
169: <input type=hidden name=selecturl value=1>
170: <table border=2>
171: <tr><th> </th><th>Title</th><th>Type</th><th>Part of ...</th></tr>
172: ENDSTART
173: map {
174: my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
175: $r->print('<tr><td><input type=submit value=Select name="'.
176: $_.'"></td><td>'.$bighash{'title_'.$_}.
177: '</td><td>'.$bighash{'type_'.$_}.
178: '</td><td><a href="'.$mapurl.'">'.$mapurl.
179: '</a></td></tr>');
180: } @possibilities;
181: $r->print('</table></form></body></html>');
1.1 www 182: untie(%bighash);
183: return OK;
184: }
185: }
186: }
187: untie(%bighash);
188: }
189:
190: # ------------------------------------ This handler should not have been called
1.2 www 191: &getlost($r,'Invalid call of handler');
1.1 www 192: return OK;
193: }
194:
195: 1;
196: __END__
197:
198:
199:
200:
201:
202:
203:
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