1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.10 2002/05/23 13:04:59 www Exp $
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: # (Handler to resolve ambiguous file locations
30: #
31: # (TeX Content Handler
32: #
33: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
34: #
35: # 10/11,10/12 Gerd Kortemeyer)
36: #
37: # 10/16 Gerd Kortemeyer
38:
39: package Apache::lonsequence;
40:
41: use strict;
42: use Apache::lonnet;
43: use Apache::Constants qw(:common :http REDIRECT);
44: use GDBM_File;
45: use Apache::lonratedt;
46: use Apache::lonratsrv;
47:
48: # ----------------------------------------------------------- Could not resolve
49:
50: sub getlost {
51: my ($r,$errmsg)=@_;
52: $r->content_type('text/html');
53: $r->send_http_header;
54: $r->print(
55: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
56: 'LON-CAPA</h1>Could not handle sequence resource reference.<p>'.$errmsg.
57: '</body></html>');
58: }
59:
60:
61: # ----------------------------------------- Attempt to read from resource space
62:
63: sub attemptread {
64: my $fn=shift;
65: &Apache::lonnet::repcopy($fn);
66: if (-e $fn) {
67: return &Apache::lonratedt::attemptread($fn);
68: } else {
69: return ();
70: }
71: }
72:
73: # ---------------------------------------------------------------- View Handler
74:
75: sub viewmap {
76: my ($r,$url)=@_;
77: $r->print('<html>');
78: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
79: <script>
80:
81: function select_group() {
82: window.location="/adm/groupsort?catalogmode=groupimport&mode=rat&acts="+document.forms.fileattr.acts.value;
83: }
84:
85: function queue(val) {
86: if (eval("document.forms."+val+".filelink.checked")) {
87: var l=val.length;
88: var v=val.substring(4,l);
89: document.forms.fileattr.acts.value+='1a'+v+'b';
90: }
91: else {
92: var l=val.length;
93: var v=val.substring(4,l);
94: document.forms.fileattr.acts.value+='0a'+v+'b';
95: }
96: }
97:
98: </script>
99: ENDSCRIPT
100: }
101: $r->print('<body bgcolor="#FFFFFF">');
102: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
103: <form name=fileattr><input type=hidden name=acts value=''>
104: <input type="button" name="close" value='CLOSE' onClick="self.close()">
105: <input type="button" name="groupimport" value='GROUP IMPORT'
106: onClick="javascript:select_group()">
107: </form>
108: ENDSELECT
109: }
110: my $idx=0;
111: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
112: if (defined($_)) {
113: $idx++;
114: if ($ENV{'form.forceselect'}) {
115: $r->print('<form name="form'.$idx.'">');
116: }
117: my ($title,$url)=split(/\:/,$_);
118: $title=~s/\&colon\;/\:/g;
119: $url=~s/\&colon\;/\:/g;
120: unless ($title) { $title=(split(/\//,$url))[-1] };
121: unless ($title) { $title='<i>Empty</i>'; }
122: if ($url) {
123: if ($ENV{'form.forceselect'}) {
124: $r->print(<<ENDCHECKBOX);
125: <input type='checkbox' name='filelink'
126: value='$url' onClick='javascript:queue("form$idx")' >
127: <input type='hidden' name='title' value='$title'>
128: ENDCHECKBOX
129: }
130: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
131: }
132: $r->print(&Apache::lonratsrv::qtescape($title));
133: if ($url) { $r->print('</a>'); }
134: if ($ENV{'form.forceselect'}) {
135: $r->print('</form>');
136: } else {
137: $r->print('<br>');
138: }
139: }
140: }
141: $r->print('</body></html>');
142: }
143:
144: # ================================================================ Main Handler
145:
146: sub handler {
147: my $r=shift;
148:
149: if ($r->header_only) {
150: $r->content_type('text/html');
151: $r->send_http_header;
152: return OK;
153: }
154:
155: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
156: ['forceselect']);
157:
158: my %hash;
159: my %bighash;
160: my $requrl=$r->uri;
161:
162: # ------------------------------------------------------------ Tie symb db file
163: my $disurl='';
164: my $dismapid='';
165:
166: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
167: my $last;
168: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
169: &GDBM_READER,0640)) {
170: $last=$hash{'last_direction'};
171: untie(%hash);
172: }
173: my $direction='';
174: my $prevmap='';
175: if ($last) {
176: ($prevmap,$direction)=(split(/\_\_\_/,$last));
177: }
178: # ------------------------------------------------------------- Tie big db file
179: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
180: &GDBM_READER,0640)) {
181: my $disid='';
182:
183: if ($direction eq 'back') {
184: $disid=$bighash{'map_finish_'.$requrl};
185: } else {
186: $disid=$bighash{'map_start_'.$requrl};
187: }
188: if ($disid) {
189: $disurl=$bighash{'src_'.$disid};
190: $dismapid=(split(/\./,$disid))[1];
191: }
192: # --------------------------------------- Untie hash, make sure to come by here
193: untie(%bighash);
194: }
195: }
196:
197: # now either disurl is set (going to first page), or we need another display
198:
199: if ($disurl) {
200: # -------------------------------------------------- Has first or last resource
201: &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
202: 'last_known' => &Apache::lonnet::declutter($disurl));
203: $r->content_type('text/html');
204: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
205: return REDIRECT;
206: } else {
207: $r->content_type('text/html');
208: $r->send_http_header;
209: &viewmap($r,$requrl);
210: return OK;
211: }
212: }
213:
214: 1;
215: __END__
216:
217:
218:
219:
220:
221:
222:
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