1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.13 2002/08/12 18:21:42 albertel 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: use Apache::lonpageflip;
48:
49: my %selhash;
50: my $successtied;
51:
52: # ----------------------------------------- Attempt to read from resource space
53:
54: sub attemptread {
55: my $fn=shift;
56: &Apache::lonnet::repcopy($fn);
57: if (-e $fn) {
58: return &Apache::lonratedt::attemptread($fn);
59: } else {
60: return ();
61: }
62: }
63:
64: # ---------------------------------------------------------------- View Handler
65:
66: sub viewmap {
67: my ($r,$url)=@_;
68: $r->print('<html>');
69: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
70: <script>
71:
72: function select_group() {
73: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
74: }
75:
76: function queue(val) {
77: if (eval("document.forms."+val+".filelink.checked")) {
78: var l=val.length;
79: var v=val.substring(4,l);
80: document.forms.fileattr.acts.value+='1a'+v+'b';
81: }
82: else {
83: var l=val.length;
84: var v=val.substring(4,l);
85: document.forms.fileattr.acts.value+='0a'+v+'b';
86: }
87: }
88:
89: </script>
90: ENDSCRIPT
91: }
92: $r->print('<body bgcolor="#FFFFFF">');
93: # ------------------ This is trying to select. Provide buttons and tie %selhash
94: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
95: <form name=fileattr><input type=hidden name=acts value=''>
96: <input type="button" name="close" value='CLOSE' onClick="self.close()">
97: <input type="button" name="groupimport" value='GROUP IMPORT'
98: onClick="javascript:select_group()">
99: </form>
100: ENDSELECT
101: my $diropendb =
102: "/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db";
103: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
104: if ($ENV{'form.launch'} eq '1') {
105: &start_fresh_session();
106: }
107: $successtied=1;
108:
109: # - Evaluate actions from previous page (both cumulatively and chronologically)
110: if ($ENV{'form.catalogmode'} eq 'groupimport') {
111: my $acts=$ENV{'form.acts'};
112: my @Acts=split(/b/,$acts);
113: my %ahash;
114: my %achash;
115: my $ac=0;
116: # some initial hashes for working with data
117: foreach (@Acts) {
118: my ($state,$ref)=split(/a/);
119: $ahash{$ref}=$state;
120: $achash{$ref}=$ac;
121: $ac++;
122: }
123: # sorting through the actions and changing the tied database hash
124: foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
125: my $key=$_;
126: if ($ahash{$key} eq '1') {
127: $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
128: $selhash{'pre_'.$key.'_title'};
129: $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
130: $selhash{'storectr'}+0;
131: $selhash{'storectr'}++;
132: }
133: if ($ahash{$key} eq '0') {
134: if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
135: delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
136: }
137: }
138: }
139: # deleting the previously cached listing
140: foreach (keys %selhash) {
141: if ($_ =~ /^pre_/ && $_ =~/link$/) {
142: my $key = $_;
143: $key =~ s/^pre_//;
144: $key =~ s/_[^_]*$//;
145: delete $selhash{'pre_'.$key.'_title'};
146: delete $selhash{'pre_'.$key.'_link'};
147: }
148: }
149: }
150: # -
151: }
152: }
153: # ----------------------------- successtied is now '1' if in working selectmode
154: my $idx=0;
155: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
156: if (defined($_)) {
157: $idx++;
158: if ($successtied) {
159: $r->print('<form name="form'.$idx.'">');
160: }
161: my ($title,$url)=split(/\:/,$_);
162: $title=~s/\&colon\;/\:/g;
163: $url=~s/\&colon\;/\:/g;
164: unless ($title) { $title=(split(/\//,$url))[-1] };
165: unless ($title) { $title='<i>Empty</i>'; }
166: if ($url) {
167: if ($successtied) {
168: my $checked='';
169: if ($selhash{'store_'.$url}) {
170: $checked=" checked";
171: }
172: $selhash{"pre_${idx}_link"}=$url;
173: $selhash{"pre_${idx}_title"}=$title;
174:
175: $r->print(<<ENDCHECKBOX);
176: <input type='checkbox' name='filelink'
177: value='$url' onClick='javascript:queue("form$idx")'$checked>
178: <input type='hidden' name='title' value='$title'>
179: ENDCHECKBOX
180: }
181: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
182: }
183: $r->print(&Apache::lonratsrv::qtescape($title));
184: if ($url) { $r->print('</a>'); }
185: if ($successtied) {
186: $r->print('</form>');
187: } else {
188: $r->print('<br>');
189: }
190: }
191: }
192: $r->print('</body></html>');
193: if ($successtied) {
194: untie %selhash;
195: }
196: }
197:
198: # ----------------------------------------------------------- Clean out selhash
199: sub start_fresh_session {
200: foreach (keys %selhash) {
201: if ($_ =~ /^pre_/) {
202: delete $selhash{$_};
203: }
204: if ($_ =~ /^store/) {
205: delete $selhash{$_};
206: }
207: }
208: }
209:
210:
211: # ================================================================ Main Handler
212:
213: sub handler {
214: my $r=shift;
215:
216: if ($r->header_only) {
217: $r->content_type('text/html');
218: $r->send_http_header;
219: return OK;
220: }
221:
222: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
223: ['forceselect','launch']);
224:
225: my %hash;
226: my %bighash;
227: my $requrl=$r->uri;
228:
229: $successtied=0;
230: # ------------------------------------------------------------ Tie symb db file
231: my $disurl='';
232: my $dismapid='';
233:
234: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
235: my $last;
236: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
237: &GDBM_READER(),0640)) {
238: $last=$hash{'last_direction'};
239: untie(%hash);
240: }
241: my $direction='';
242: my $prevmap='';
243: if ($last) {
244: ($prevmap,$direction)=(split(/\_\_\_/,$last));
245: }
246: # ------------------------------------------------------------- Tie big db file
247: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
248: &GDBM_READER(),0640)) {
249: my $disid='';
250:
251: if ($direction eq 'back') {
252: $disid=$bighash{'map_finish_'.$requrl};
253: } else {
254: $disid=$bighash{'map_start_'.$requrl};
255: }
256: if ($disid) {
257: $disurl=$bighash{'src_'.$disid};
258: $dismapid=(split(/\./,$disid))[1];
259: }
260: # ------------------------- If this is an empty one, skip to next non-empty one
261: if ((!$disurl) && ($disid)) {
262: $direction=($direction?$direction:'forward');
263: ($disid,$requrl)=
264: &Apache::lonpageflip::fullmove($disid,
265: &Apache::lonnet::declutter($requrl),$direction);
266: if ($disid) {
267: $disurl=$bighash{'src_'.$disid};
268: $dismapid=(split(/\./,$disid))[1];
269: }
270: }
271:
272: # --------------------------------------- Untie hash, make sure to come by here
273: untie(%bighash);
274: }
275: }
276:
277: # now either disurl is set (going to first page), or we need another display
278:
279: if ($disurl) {
280: # -------------------------------------------------- Has first or last resource
281: &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
282: 'last_known' => &Apache::lonnet::declutter($disurl));
283: $r->content_type('text/html');
284: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
285: return REDIRECT;
286: } else {
287: $r->content_type('text/html');
288: $r->send_http_header;
289: &viewmap($r,$requrl);
290: return OK;
291: }
292: }
293:
294: 1;
295: __END__
296:
297:
298:
299:
300:
301:
302:
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