Annotation of rat/lonambiguous.pm, revision 1.10
1.1 www 1: # The LearningOnline Network with CAPA
2: # Handler to resolve ambiguous file locations
3: #
1.10 ! www 4: # $Id: lonambiguous.pm,v 1.9 2003/04/12 15:43:58 www Exp $
1.4 www 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;
1.9 www 40: use Apache::loncommon;
1.10 ! www 41: use Apache::lonlocal;
1.1 www 42:
1.8 www 43: my %bighash;
44:
45: sub cleanup {
46: if (tied(%bighash)){
47: &Apache::lonnet::logthis('Cleanup ambiguous: bighash');
48: unless (untie(%bighash)) {
49: &Apache::lonnet::logthis('Failed cleanup ambiguous: bighash');
50: }
51: }
52: }
1.1 www 53:
54: # ----------------------------------------------------------- Could not resolve
55:
56: sub getlost {
1.2 www 57: my ($r,$errmsg)=@_;
1.10 ! www 58: $errmsg=&mt($errmsg);
1.1 www 59: $r->content_type('text/html');
60: $r->send_http_header;
1.2 www 61: $r->print(
1.9 www 62: '<head><title>Unknown Error</title></head>'.
63: &Apache::loncommon::bodytag('Could not handle ambiguous resource reference').
64: $errmsg.
1.2 www 65: '</body></html>');
1.1 www 66: }
67:
68: # ================================================================ Main Handler
69:
70: sub handler {
71: my $r=shift;
72:
73: if ($r->header_only) {
1.10 ! www 74: &Apache::loncommon::content_type($r,'text/html');
1.1 www 75: $r->send_http_header;
76: return OK;
77: }
78:
1.2 www 79: # ---------------------------------------------------------- Is this selecting?
1.8 www 80:
1.2 www 81: if ($ENV{'form.selecturl'}) {
82: my $envkey;
83: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.5 albertel 84: &GDBM_READER(),0640)) {
1.2 www 85: foreach $envkey (keys %ENV) {
86: if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
1.3 www 87: # ---------------------------------------------------- Update symb and redirect
1.2 www 88: my $mapid=$1;
89: my $resid=$2;
90: my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
91: &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
92: $resurl => $resid);
1.3 www 93: untie(%bighash);
1.2 www 94: $r->header_out(Location =>
95: 'http://'.$ENV{'HTTP_HOST'}.$resurl);
96: return REDIRECT;
97: }
98: }
99: untie(%bighash);
100: } else {
101: &getlost($r,'Could not access course structure.');
102: return OK;
103: }
104: }
105:
1.1 www 106: # ---------------------------------------------------------- Do we have a case?
107:
108: my $thisfn;
109: unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) {
1.2 www 110: &getlost($r,'Could not find information on resource.');
1.1 www 111: return OK;
112: }
113:
114: # ---------------------------------- Should this file have been part of a page?
115:
116: $thisfn=&Apache::lonnet::declutter($thisfn);
117: my %hash;
118: my $syval='';
119:
120: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1.5 albertel 121: &GDBM_READER(),0640)) {
1.1 www 122: $syval=$hash{$thisfn};
123: untie(%hash);
124: }
1.2 www 125:
1.1 www 126: # ---------------------------------------------------------- There was an entry
1.2 www 127:
1.1 www 128: if ($syval) {
1.2 www 129:
1.1 www 130: if ($syval=~/\_$/) {
131: # ----------------------------------- Okay, this should have appeared on a page
132: $syval=~s/\_\_\_$//;
133: $r->content_type('text/html');
134: $r->header_out(Location =>
135: 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval);
136: return REDIRECT;
137: } else {
138: # There is not really a problem (???), but cannot go back without endless loop
1.2 www 139: &getlost($r,'The nature of the problem is unclear');
1.1 www 140: return OK;
141: }
142: }
143:
144: # ------------------------------------------------ Would be standalone resource
145:
146: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.5 albertel 147: &GDBM_READER(),0640)) {
1.1 www 148: # ---------------------------------------------- Get ID(s) for current resource
1.7 albertel 149: my $ids=$bighash{'ids_'.&Apache::lonnet::clutter($thisfn)};
1.1 www 150: if ($ids) {
151: # ------------------------------------------------------------------- Has ID(s)
152: my @possibilities=split(/\,/,$ids);
153: my $couldbe='';
154: map {
1.2 www 155: if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) {
1.1 www 156: if ($couldbe) {
157: $couldbe.=','.$_;
158: } else {
159: $couldbe=$_;
160: }
161: }
162: } @possibilities;
163: if ($couldbe) {
164: @possibilities=split(/\,/,$couldbe);
165: if ($#possibilities>0) {
166: # ----------------------------------------------- Okay, really multiple choices
167: $r->content_type('text/html');
168: $r->send_http_header;
1.9 www 169: my $bodytag=
170: &Apache::loncommon::bodytag('Pick Instance of Resource');
1.2 www 171: $r->print(<<ENDSTART);
172: <head><title>Choose Location</title></head>
1.9 www 173: $bodytag
1.2 www 174: The resource you had been accessing appears more than once in this course,
175: and LON-CAPA has insufficient session information to determine which instance
176: of the resource you meant.
177: <p>
178: Please click on the instance of the resource you intended to access:
179: <p>
180: <form action="/adm/ambiguous" method=post>
181: <input type=hidden name=orgurl value="$thisfn">
182: <input type=hidden name=selecturl value=1>
183: <table border=2>
184: <tr><th> </th><th>Title</th><th>Type</th><th>Part of ...</th></tr>
185: ENDSTART
186: map {
187: my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
188: $r->print('<tr><td><input type=submit value=Select name="'.
189: $_.'"></td><td>'.$bighash{'title_'.$_}.
190: '</td><td>'.$bighash{'type_'.$_}.
1.9 www 191: '</td><td>'.
192: ($mapurl=~/^\/uploaded\//?'':'<a href="'.$mapurl.'">').
193: &Apache::lonnet::gettitle($mapurl).' '.
194: ($mapurl=~/^\/uploaded\//?'':'</a>').'</td></tr>');
1.2 www 195: } @possibilities;
196: $r->print('</table></form></body></html>');
1.1 www 197: untie(%bighash);
198: return OK;
199: }
200: }
201: }
202: untie(%bighash);
203: }
204:
205: # ------------------------------------ This handler should not have been called
1.2 www 206: &getlost($r,'Invalid call of handler');
1.1 www 207: return OK;
208: }
209:
210: 1;
211: __END__
212:
213:
214:
215:
216:
217:
218:
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