1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.26 2006/04/04 15:32:12 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:
32: package Apache::lonsequence;
33:
34: use strict;
35: use Apache::lonnet;
36: use Apache::Constants qw(:common :http REDIRECT);
37: use GDBM_File;
38: use Apache::lonratedt;
39: use Apache::lonratsrv;
40: use Apache::lonpageflip;
41: use Apache::loncommon;
42: use Apache::lonlocal;
43:
44: my %selhash;
45: my $successtied;
46:
47: # ----------------------------------------- Attempt to read from resource space
48:
49: sub attemptread {
50: my $fn=shift;
51: &Apache::lonnet::repcopy($fn);
52: if (-e $fn) {
53: return &Apache::lonratedt::attemptread($fn);
54: } else {
55: return ();
56: }
57: }
58:
59: sub mapread {
60: my $fn=shift;
61: &Apache::lonnet::repcopy($fn);
62: if (-e $fn) {
63: return &Apache::lonratedt::mapread($fn,'');
64: } else {
65: return ();
66: }
67: }
68:
69: # ---------------------------------------------------------------- View Handler
70:
71: sub viewmap {
72: my ($r,$url)=@_;
73:
74: my $js;
75: if ($env{'form.forceselect'}) {
76: $js = (<<ENDSCRIPT);
77: <script type="text/javascript">
78:
79: function select_group() {
80: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
81: }
82:
83: function queue(val) {
84: if (eval("document.forms."+val+".filelink.checked")) {
85: var l=val.length;
86: var v=val.substring(4,l);
87: document.forms.fileattr.acts.value+='1a'+v+'b';
88: }
89: else {
90: var l=val.length;
91: var v=val.substring(4,l);
92: document.forms.fileattr.acts.value+='0a'+v+'b';
93: }
94: }
95:
96: </script>
97: ENDSCRIPT
98: }
99:
100: $r->print(&Apache::loncommon::start_page('Map Contents',$js).
101: '<h1>'.$url.'</h1>');
102: # ------------------ This is trying to select. Provide buttons and tie %selhash
103: if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
104: <form name=fileattr><input type=hidden name=acts value=''>
105: <input type="button" name="close" value='CLOSE' onClick="self.close()">
106: <input type="button" name="groupimport" value='GROUP IMPORT'
107: onClick="javascript:select_group()">
108: </form>
109: ENDSELECT
110: my $diropendb =
111: "/home/httpd/perl/tmp/$env{'user.domain'}\_$env{'user.name'}_groupsec.db";
112: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
113: if ($env{'form.launch'} eq '1') {
114: &start_fresh_session();
115: }
116: $successtied=1;
117:
118: # - Evaluate actions from previous page (both cumulatively and chronologically)
119: if ($env{'form.catalogmode'} eq 'groupimport') {
120: my $acts=$env{'form.acts'};
121: my @Acts=split(/b/,$acts);
122: my %ahash;
123: my %achash;
124: my $ac=0;
125: # some initial hashes for working with data
126: foreach (@Acts) {
127: my ($state,$ref)=split(/a/);
128: $ahash{$ref}=$state;
129: $achash{$ref}=$ac;
130: $ac++;
131: }
132: # sorting through the actions and changing the tied database hash
133: foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
134: my $key=$_;
135: if ($ahash{$key} eq '1') {
136: $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
137: $selhash{'pre_'.$key.'_title'};
138: $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
139: $selhash{'storectr'}+0;
140: $selhash{'storectr'}++;
141: }
142: if ($ahash{$key} eq '0') {
143: if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
144: delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
145: }
146: }
147: }
148: # deleting the previously cached listing
149: foreach (keys %selhash) {
150: if ($_ =~ /^pre_/ && $_ =~/link$/) {
151: my $key = $_;
152: $key =~ s/^pre_//;
153: $key =~ s/_[^_]*$//;
154: delete $selhash{'pre_'.$key.'_title'};
155: delete $selhash{'pre_'.$key.'_link'};
156: }
157: }
158: }
159: # -
160: }
161: }
162: # ----------------------------- successtied is now '1' if in working selectmode
163: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
164: if ($fatal==1) {
165: $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
166: }
167: my $idx=0;
168: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
169: if (defined($_)) {
170: $idx++;
171: if ($successtied) {
172: $r->print('<form name="form'.$idx.'">');
173: }
174: my ($title,$url)=split(/\:/,$_);
175: $title=~s/\&colon\;/\:/g;
176: $url=~s/\&colon\;/\:/g;
177: unless ($title) { $title=(split(/\//,$url))[-1] };
178: unless ($title) { $title='<i>'.&mt('Empty').'</i>'; }
179: if ($url) {
180: if ($successtied) {
181: my $checked='';
182: if ($selhash{'store_'.$url}) {
183: $checked=" checked";
184: }
185: $selhash{"pre_${idx}_link"}=$url;
186: $selhash{"pre_${idx}_title"}=$title;
187:
188: $r->print(<<ENDCHECKBOX);
189: <input type='checkbox' name='filelink'
190: value='$url' onClick='javascript:queue("form$idx")'$checked>
191: <input type='hidden' name='title' value='$title'>
192: ENDCHECKBOX
193: }
194: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
195: }
196: $r->print(&Apache::lonratsrv::qtescape($title));
197: if ($url) { $r->print('</a>'); }
198: if ($successtied) {
199: $r->print('</form>');
200: } else {
201: $r->print('<br>');
202: }
203: }
204: }
205: $r->print(&Apache::loncommon::end_page());
206: if ($successtied) {
207: untie %selhash;
208: }
209: }
210:
211: # ----------------------------------------------------------- Clean out selhash
212: sub start_fresh_session {
213: foreach (keys %selhash) {
214: if ($_ =~ /^pre_/) {
215: delete $selhash{$_};
216: }
217: if ($_ =~ /^store/) {
218: delete $selhash{$_};
219: }
220: }
221: }
222:
223:
224: # ================================================================ Main Handler
225:
226: sub handler {
227: my $r=shift;
228:
229: if ($r->header_only) {
230: &Apache::loncommon::content_type($r,'text/html');
231: $r->send_http_header;
232: return OK;
233: }
234:
235: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
236: ['forceselect','launch']);
237:
238: my %hash;
239: my %bighash;
240: my $requrl=$r->uri;
241:
242: $successtied=0;
243: # ------------------------------------------------------------ Tie symb db file
244: my $disurl='';
245: my $dismapid='';
246: my $exitdisid = '';
247: my $arrow_dir = '';
248:
249: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
250: my $last;
251: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
252: &GDBM_READER(),0640)) {
253: $last=$hash{'last_direction'};
254: untie(%hash);
255: }
256: my $direction='';
257: my $prevmap='';
258: if ($last) {
259: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
260: }
261: # ------------------------------------------------------------- Tie big db file
262: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
263: &GDBM_READER(),0640)) {
264: my $disid='';
265: my $randomout ='';
266:
267: if ($direction eq 'back') {
268: $disid=$bighash{'map_finish_'.$requrl};
269: } else {
270: $disid=$bighash{'map_start_'.$requrl};
271: }
272: if ($disid) {
273: $disurl=$bighash{'src_'.$disid};
274: $dismapid=(split(/\./,$disid))[1];
275: if (!$env{'request.role.adv'}) {
276: $randomout = $bighash{'randomout_'.$disid};
277: }
278: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
279: &GDBM_READER(),0640)) {
280: $last=$hash{'last_known'};
281: untie(%hash);
282: }
283:
284:
285: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
286: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
287: $direction=($direction?$direction:'forward');
288: ($disid,$requrl)=
289: &Apache::lonpageflip::fullmove($disid,
290: &Apache::lonnet::declutter($requrl),$direction);
291: if ($disid) {
292: $disurl=$bighash{'src_'.$disid};
293: $dismapid=(split(/\./,$disid))[1];
294: if (!$env{'request.role.adv'}) {
295: $randomout = $bighash{'randomout_'.$disid};
296: }
297: }
298: }
299: $exitdisid = $disid;
300: $arrow_dir = $direction;
301:
302: # --------------------------------------- Untie hash, make sure to come by here
303: untie(%bighash);
304: }
305: }
306:
307: # now either disurl is set (going to first page), or we need another display
308: if ($disurl) {
309: # -------------------------------------------------- Has first or last resource
310: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
311: 'last_known' => [$disurl,$dismapid]);
312: &Apache::loncommon::content_type($r,'text/html');
313: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
314: return REDIRECT;
315: } else {
316: &Apache::loncommon::content_type($r,'text/html');
317: $r->send_http_header;
318: if ($exitdisid eq '' && $arrow_dir ne '') {
319: my %lt =&Apache::lonlocal::texthash(
320: 'back' => 'beginning',
321: 'forward' => 'end',
322: 'nere' => 'Next resource could not be displayed',
323: 'goba' => 'Go Back',
324: 'nacc' => 'Navigate Course Content',
325: );
326: my $warnmsg = &mt('As all folders and sequences ');
327: if ($arrow_dir eq 'forward') {
328: $warnmsg .= &mt('following the current resource were empty').',';
329: } elsif ($arrow_dir eq 'back') {
330: $warnmsg .= &mt('preceding the current resource were empty').',';
331: }
332: $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
333: my $start_page=
334: &Apache::loncommon::start_page('Empty Folder/Sequence');
335: my $end_page=
336: &Apache::loncommon::end_page();
337: $r->print(<<ENDNONE);
338: $start_page
339: <h3>$lt{'nere'}</h3>
340: <p>$warnmsg</p>
341: <ul>
342: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
343: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
344: </ul>
345: $end_page
346: ENDNONE
347: } else {
348: &viewmap($r,$requrl);
349: }
350: return OK;
351: }
352: }
353:
354: 1;
355: __END__
356:
357:
358:
359:
360:
361:
362:
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