Annotation of rat/lonambiguous.pm, revision 1.20
1.1 www 1: # The LearningOnline Network with CAPA
2: # Handler to resolve ambiguous file locations
3: #
1.20 ! albertel 4: # $Id: lonambiguous.pm,v 1.19 2006/03/19 23:09:07 albertel 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:
29: package Apache::lonambiguous;
30:
31: use strict;
32: use Apache::lonnet;
33: use Apache::Constants qw(:common REDIRECT);
34: use GDBM_File;
1.9 www 35: use Apache::loncommon;
1.10 www 36: use Apache::lonlocal;
1.1 www 37:
1.8 www 38: my %bighash;
39:
40: sub cleanup {
41: if (tied(%bighash)){
42: &Apache::lonnet::logthis('Cleanup ambiguous: bighash');
43: unless (untie(%bighash)) {
44: &Apache::lonnet::logthis('Failed cleanup ambiguous: bighash');
45: }
46: }
1.17 albertel 47: return OK;
1.8 www 48: }
1.1 www 49:
50: # ----------------------------------------------------------- Could not resolve
51:
52: sub getlost {
1.2 www 53: my ($r,$errmsg)=@_;
1.10 www 54: $errmsg=&mt($errmsg);
1.14 albertel 55: &Apache::loncommon::content_type($r,'text/html');
1.1 www 56: $r->send_http_header;
1.18 albertel 57: $r->print(&Apache::loncommon::start_page('Could not handle ambiguous resource reference').
58: $errmsg.
1.19 albertel 59: &Apache::loncommon::end_page());
1.1 www 60: }
61:
62: # ================================================================ Main Handler
63:
1.11 albertel 64: sub make_symb {
65: my ($id)=@_;
66: my ($mapid,$resid)=split(/\./,$id);
67: my $map=$bighash{'map_id_'.$mapid};
68: my $res=$bighash{'src_'.$id};
69: my $symb=&Apache::lonnet::encode_symb($map,$resid,$res);
70: return $symb;
71: }
72:
1.1 www 73: sub handler {
74: my $r=shift;
75:
76: if ($r->header_only) {
1.10 www 77: &Apache::loncommon::content_type($r,'text/html');
1.1 www 78: $r->send_http_header;
79: return OK;
80: }
81:
1.2 www 82: # ---------------------------------------------------------- Is this selecting?
1.8 www 83:
1.16 albertel 84: if ($env{'form.selecturl'}) {
1.2 www 85: my $envkey;
1.16 albertel 86: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.5 albertel 87: &GDBM_READER(),0640)) {
1.16 albertel 88: foreach $envkey (keys %env) {
1.2 www 89: if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
1.3 www 90: # ---------------------------------------------------- Update symb and redirect
1.2 www 91: my $mapid=$1;
92: my $resid=$2;
93: my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
94: &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
1.15 albertel 95: $resurl => [$resurl,$resid]);
1.3 www 96: untie(%bighash);
1.2 www 97: $r->header_out(Location =>
1.20 ! albertel 98: &Apache::loncommon::absolute_url().$resurl);
1.2 www 99: return REDIRECT;
100: }
101: }
102: untie(%bighash);
103: } else {
104: &getlost($r,'Could not access course structure.');
105: return OK;
106: }
107: }
108:
1.1 www 109: # ---------------------------------------------------------- Do we have a case?
110:
111: my $thisfn;
1.16 albertel 112: unless (($thisfn=$env{'request.ambiguous'})&&($env{'request.course.fn'})) {
1.2 www 113: &getlost($r,'Could not find information on resource.');
1.1 www 114: return OK;
115: }
116:
117: # ---------------------------------- Should this file have been part of a page?
118:
119: $thisfn=&Apache::lonnet::declutter($thisfn);
120: my %hash;
121: my $syval='';
122:
1.16 albertel 123: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.5 albertel 124: &GDBM_READER(),0640)) {
1.1 www 125: $syval=$hash{$thisfn};
126: untie(%hash);
127: }
1.2 www 128:
1.1 www 129: # ---------------------------------------------------------- There was an entry
1.2 www 130:
1.1 www 131: if ($syval) {
1.15 albertel 132: my ($page,undef,$res)=&Apache::lonnet::decode_symb($syval);
133: if ($res eq 'page') {
1.1 www 134: # ----------------------------------- Okay, this should have appeared on a page
1.14 albertel 135: &Apache::loncommon::content_type($r,'text/html');
1.1 www 136: $r->header_out(Location =>
1.20 ! albertel 137: &Apache::loncommon::absolute_url().
1.15 albertel 138: &Apache::lonnet::clutter($page));
1.1 www 139: return REDIRECT;
140: } else {
141: # There is not really a problem (???), but cannot go back without endless loop
1.2 www 142: &getlost($r,'The nature of the problem is unclear');
1.1 www 143: return OK;
144: }
145: }
1.13 albertel 146: # ------------------------------------Encrypted requests go straight to navmaps
1.16 albertel 147: if ($env{'request.enc'}) {
1.14 albertel 148: &Apache::loncommon::content_type($r,'text/html');
1.20 ! albertel 149: $r->header_out(Location =>
! 150: &Apache::loncommon::absolute_url().'/adm/navmaps');
1.13 albertel 151: return REDIRECT;
152: }
1.1 www 153: # ------------------------------------------------ Would be standalone resource
154:
1.16 albertel 155: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.5 albertel 156: &GDBM_READER(),0640)) {
1.1 www 157: # ---------------------------------------------- Get ID(s) for current resource
1.7 albertel 158: my $ids=$bighash{'ids_'.&Apache::lonnet::clutter($thisfn)};
1.1 www 159: if ($ids) {
160: # ------------------------------------------------------------------- Has ID(s)
161: my @possibilities=split(/\,/,$ids);
162: my $couldbe='';
1.11 albertel 163: foreach (@possibilities) {
164: if ($bighash{'encrypted_'.$_}) { next; }
165: my $symb=&make_symb($_);
166: if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_},$symb)) {
1.1 www 167: if ($couldbe) {
168: $couldbe.=','.$_;
169: } else {
170: $couldbe=$_;
171: }
172: }
1.11 albertel 173: }
1.1 www 174: if ($couldbe) {
175: @possibilities=split(/\,/,$couldbe);
1.12 albertel 176: if ($#possibilities==0) {
177: my $id=$possibilities[0];
178: my $resurl=$bighash{'src_'.$id};
179: my $mapurl=$bighash{'map_id_'.(split(/\./,$id))[0]};
180: my $symb=&make_symb($id);
1.14 albertel 181: &Apache::loncommon::content_type($r,'text/html');
1.12 albertel 182: $r->header_out(Location =>
1.20 ! albertel 183: &Apache::loncommon::absolute_url().
! 184: $resurl.'?symb='.$symb);
1.12 albertel 185: return REDIRECT;
186: }
1.1 www 187: if ($#possibilities>0) {
188: # ----------------------------------------------- Okay, really multiple choices
1.14 albertel 189: &Apache::loncommon::content_type($r,'text/html');
1.1 www 190: $r->send_http_header;
1.18 albertel 191: my $start_page=
192: &Apache::loncommon::start_page('Pick Instance of Resource');
1.2 www 193: $r->print(<<ENDSTART);
1.18 albertel 194: $start_page
1.2 www 195: The resource you had been accessing appears more than once in this course,
196: and LON-CAPA has insufficient session information to determine which instance
197: of the resource you meant.
198: <p>
199: Please click on the instance of the resource you intended to access:
1.11 albertel 200: </p>
201: <table border="2">
202: <tr><th>Title</th><th>Part of ...</th></tr>
1.2 www 203: ENDSTART
204: map {
1.11 albertel 205: my $resurl=$bighash{'src_'.$_};
1.2 www 206: my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
1.11 albertel 207: my $symb=&make_symb($_);
208: $r->print('<tr><td><a href="'.$resurl.'?symb='.$symb.'">'.
209: &Apache::lonnet::gettitle($symb).
210: '</a></td><td>'.
211: &Apache::lonnet::gettitle($mapurl).' '.
212: '</td></tr>');
1.2 www 213: } @possibilities;
1.18 albertel 214: $r->print('</table>'.&Apache::loncommon::end_page());
1.1 www 215: untie(%bighash);
216: return OK;
217: }
218: }
219: }
220: untie(%bighash);
221: }
222:
223: # ------------------------------------ This handler should not have been called
1.2 www 224: &getlost($r,'Invalid call of handler');
1.1 www 225: return OK;
226: }
227:
228: 1;
229: __END__
230:
231:
232:
233:
234:
235:
236:
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