1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.42 2012/12/16 17:48:39 raeburn 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:
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 LONCAPA::map();
39: use LONCAPA;
40: use Apache::lonpageflip();
41: use Apache::loncommon();
42: use Apache::groupsort();
43: use Apache::lonlocal;
44: use HTML::Entities();
45:
46: my %selhash;
47: my $successtied;
48:
49: # ----------------------------------------- Attempt to read from resource space
50:
51: sub attemptread {
52: my ($fn,$unsorted)=@_;
53: &Apache::lonnet::repcopy($fn);
54: if (-e $fn) {
55: return &LONCAPA::map::attemptread($fn,$unsorted);
56: } else {
57: return ();
58: }
59: }
60:
61: sub mapread {
62: my $fn=shift;
63: &Apache::lonnet::repcopy($fn);
64: if (-e $fn) {
65: return &LONCAPA::map::mapread($fn,'');
66: } else {
67: return ();
68: }
69: }
70:
71: # ---------------------------------------------------------------- View Handler
72:
73: sub viewmap {
74: my ($r,$url)=@_;
75:
76: my $js;
77: if ($env{'form.forceselect'}) {
78: $js = (<<ENDSCRIPT);
79: <script type="text/javascript">
80:
81: function select_group() {
82: window.location="/adm/groupsort?catalogmode=groupsec&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:
102: $r->print(&Apache::loncommon::start_page('Map Contents',$js).
103: '<h1>'.$url.'</h1>');
104: # ------------------ This is trying to select. Provide buttons and tie %selhash
105: if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
106: <form name="fileattr"><input type="hidden" name="acts" value="" />
107: <input type="button" name="close" value="CLOSE" onClick="self.close()" />
108: <input type="button" name="groupimport" value="GROUP IMPORT"
109: onClick="javascript:select_group()" />
110: </form>
111: ENDSELECT
112: my $diropendb =
113: LONCAPA::tempdir() .
114: "$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
115: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
116: if ($env{'form.launch'} eq '1') {
117: &start_fresh_session();
118: }
119: $successtied=1;
120:
121: # - Evaluate actions from previous page (both cumulatively and chronologically)
122: if ($env{'form.catalogmode'} eq 'import') {
123: &Apache::groupsort::update_actions_hash(\%selhash);
124: }
125: # -
126: }
127: }
128: # ----------------------------- successtied is now '1' if in working selectmode
129: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
130: if ($fatal==1) {
131: $r->print('<p class="LC_warning">'
132: .&mt('Map contents are not shown in order.')
133: .'</p><br />');
134: }
135: my $idx=0;
136: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
137: if (defined($_)) {
138: $idx++;
139: if ($successtied) {
140: $r->print('<form name="form'.$idx.'">');
141: }
142: my ($title,$url)=split(/\:/,$_);
143: $title = &LONCAPA::map::qtescape($title);
144: unless ($title) { $title=(split(/\//,$url))[-1] };
145: my $enc_title = &HTML::Entities::encode($title,'\'"<>&');
146: unless ($title) {
147: $title='<i>'.&mt('Empty').'</i>';
148: $enc_title = &mt('Empty');
149: }
150: $url = &LONCAPA::map::qtescape($url);
151: my $enc_url = &HTML::Entities::encode($url,'\'"<>&');
152: if ($url) {
153: if ($successtied) {
154: my $checked='';
155: if ($selhash{'store_'.$url}) {
156: $checked=' checked="checked"';
157: }
158: $selhash{"pre_${idx}_link"}=$url;
159: $selhash{"pre_${idx}_title"}=$title;
160:
161: $url = &HTML::Entities::encode($url, '\'"<>&');
162: $r->print(<<ENDCHECKBOX);
163: <input type='checkbox' name='filelink'
164: value='$enc_url' onClick='javascript:queue("form$idx")'$checked />
165: <input type='hidden' name='title' value='$enc_title' />
166: ENDCHECKBOX
167: }
168: $r->print('<a href="'.$enc_url.'">');
169: }
170: $r->print($enc_title);
171: if ($url) { $r->print('</a>'); }
172: if ($successtied) {
173: $r->print('</form>');
174: } else {
175: $r->print('<br />');
176: }
177: }
178: }
179: $r->print(&Apache::loncommon::end_page());
180: if ($successtied) {
181: untie %selhash;
182: }
183: }
184:
185: # ----------------------------------------------------------- Clean out selhash
186: sub start_fresh_session {
187: foreach (keys %selhash) {
188: if ($_ =~ /^pre_/) {
189: delete $selhash{$_};
190: }
191: if ($_ =~ /^store/) {
192: delete $selhash{$_};
193: }
194: }
195: }
196:
197:
198: # ================================================================ Main Handler
199:
200: sub handler {
201: my $r=shift;
202:
203: if ($r->header_only) {
204: &Apache::loncommon::content_type($r,'text/html');
205: $r->send_http_header;
206: return OK;
207: }
208:
209: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
210: ['forceselect','launch']);
211:
212: my %hash;
213: my %bighash;
214: my $requrl=$r->uri;
215:
216: $successtied=0;
217: # ------------------------------------------------------------ Tie symb db file
218: my $disurl='';
219: my $dismapid='';
220: my $exitdisid = '';
221: my $arrow_dir = '';
222: my $is_encrypted = '';
223:
224: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
225: my $last;
226: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
227: &GDBM_READER(),0640)) {
228: $last=$hash{'last_direction'};
229: untie(%hash);
230: }
231: my $direction='';
232: my $prevmap='';
233: if ($last) {
234: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
235: }
236: # ------------------------------------------------------------- Tie big db file
237: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
238: &GDBM_READER(),0640)) {
239: my $disid='';
240: my $randomout ='';
241:
242: if ($direction eq 'back') {
243: $disid=$bighash{'map_finish_'.$requrl};
244: } else {
245: $disid=$bighash{'map_start_'.$requrl};
246: }
247: if ($disid) {
248: $disurl=$bighash{'src_'.$disid};
249: $dismapid=(split(/\./,$disid))[1];
250: if (!$env{'request.role.adv'}) {
251: $randomout = $bighash{'randomout_'.$disid};
252: }
253: if (!$env{'request.role.adv'}) {
254: $is_encrypted = $bighash{'encrypted_'.$disid};
255: }
256: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
257: &GDBM_READER(),0640)) {
258: $last=$hash{'last_known'};
259: untie(%hash);
260: }
261:
262:
263: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
264: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
265: $direction=($direction?$direction:'forward');
266: ($disid,$requrl)=
267: &Apache::lonpageflip::fullmove($disid,
268: &Apache::lonnet::declutter($requrl),$direction);
269: if ($disid) {
270: $disurl=$bighash{'src_'.$disid};
271: $dismapid=(split(/\./,$disid))[1];
272: if (!$env{'request.role.adv'}) {
273: $randomout = $bighash{'randomout_'.$disid};
274: }
275: if (!$env{'request.role.adv'}) {
276: $is_encrypted = $bighash{'encrypted_'.$disid};
277: }
278: }
279: }
280: $exitdisid = $disid;
281: $arrow_dir = $direction;
282:
283: # --------------------------------------- Untie hash, make sure to come by here
284: untie(%bighash);
285: }
286: }
287:
288: # now either disurl is set (going to first page), or we need another display
289: if ($disurl) {
290: # -------------------------------------------------- Has first or last resource
291: my $showdisurl = $disurl;
292: if ($is_encrypted) {
293: $showdisurl = &Apache::lonenc::encrypted($disurl);
294: }
295: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
296: 'last_known' => [$disurl,$dismapid]);
297: &Apache::loncommon::content_type($r,'text/html');
298: $r->header_out(Location => &Apache::lonnet::absolute_url($ENV{'SERVER_NAME'}).
299: $showdisurl);
300: return REDIRECT;
301: } else {
302: &Apache::loncommon::content_type($r,'text/html');
303: $r->send_http_header;
304: if ($exitdisid eq '' && $arrow_dir ne '') {
305: my %lt =&Apache::lonlocal::texthash(
306: 'nere' => 'Next resource could not be displayed',
307: 'goba' => 'Go Back',
308: 'nacc' => 'Navigate Course Content',
309: );
310: my $warnmsg;
311: if ($arrow_dir eq 'forward') {
312: $warnmsg = &mt('As all folders and sequences '
313: .'following the current resource were empty, '
314: .'you have now reached the end of the course.');
315: } elsif ($arrow_dir eq 'back') {
316: $warnmsg = &mt('As all folders and sequences '.
317: .'preceding the current resource were empty, '
318: .'you have now reached the beginning of the course.');
319: }
320: my $start_page=
321: &Apache::loncommon::start_page('Empty Folder/Sequence');
322: my $end_page=
323: &Apache::loncommon::end_page();
324: $r->print(<<ENDNONE);
325: $start_page
326: <h3>$lt{'nere'}</h3>
327: <p>$warnmsg</p>
328: <ul>
329: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
330: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
331: </ul>
332: $end_page
333: ENDNONE
334: } else {
335: &viewmap($r,$requrl);
336: }
337: return OK;
338: }
339: }
340:
341: 1;
342: __END__
343:
344: =head1 NAME
345:
346: Apache::lonsequence
347:
348: =head1 SYNOPSIS
349:
350: Handler for showing sequence objects of
351: educational resources.
352:
353: This is part of the LearningOnline Network with CAPA project
354: described at http://www.lon-capa.org.
355:
356: =head1 SUBROUTINES
357:
358: =over
359:
360: =item handler()
361:
362: =item viewmap()
363:
364: =item attemptread()
365:
366: =item mapread()
367:
368: =item start_fresh_session()
369:
370: =back
371:
372: =cut
373:
374:
375:
376:
377:
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