Annotation of rat/lonsequence.pm, revision 1.47
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
1.47 ! raeburn 5: # $Id: lonsequence.pm,v 1.46 2017/08/21 21:30:05 raeburn Exp $
1.5 www 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: #
1.1 www 29:
1.33 jms 30:
31:
1.3 www 32: package Apache::lonsequence;
1.1 www 33:
34: use strict;
35: use Apache::lonnet;
1.3 www 36: use Apache::Constants qw(:common :http REDIRECT);
1.1 www 37: use GDBM_File;
1.28 albertel 38: use LONCAPA::map();
1.41 foxr 39: use LONCAPA;
1.28 albertel 40: use Apache::lonpageflip();
41: use Apache::loncommon();
1.31 albertel 42: use Apache::groupsort();
1.16 www 43: use Apache::lonlocal;
1.46 raeburn 44: use Apache::lonnavmaps();
45: use Apache::lonenc();
1.30 albertel 46: use HTML::Entities();
1.1 www 47:
1.12 www 48: my %selhash;
49: my $successtied;
1.8 www 50:
51: # ----------------------------------------- Attempt to read from resource space
52:
53: sub attemptread {
1.32 albertel 54: my ($fn,$unsorted)=@_;
1.8 www 55: &Apache::lonnet::repcopy($fn);
56: if (-e $fn) {
1.32 albertel 57: return &LONCAPA::map::attemptread($fn,$unsorted);
1.8 www 58: } else {
59: return ();
60: }
61: }
62:
1.15 www 63: sub mapread {
64: my $fn=shift;
65: &Apache::lonnet::repcopy($fn);
66: if (-e $fn) {
1.28 albertel 67: return &LONCAPA::map::mapread($fn,'');
1.15 www 68: } else {
69: return ();
70: }
71: }
72:
1.8 www 73: # ---------------------------------------------------------------- View Handler
74:
75: sub viewmap {
1.9 www 76: my ($r,$url)=@_;
1.26 albertel 77:
78: my $js;
79: if ($env{'form.forceselect'}) {
80: $js = (<<ENDSCRIPT);
81: <script type="text/javascript">
1.8 www 82:
83: function select_group() {
1.12 www 84: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
1.8 www 85: }
86:
87: function queue(val) {
88: if (eval("document.forms."+val+".filelink.checked")) {
89: var l=val.length;
90: var v=val.substring(4,l);
91: document.forms.fileattr.acts.value+='1a'+v+'b';
92: }
93: else {
94: var l=val.length;
95: var v=val.substring(4,l);
96: document.forms.fileattr.acts.value+='0a'+v+'b';
97: }
98: }
99:
100: </script>
101: ENDSCRIPT
102: }
1.26 albertel 103:
104: $r->print(&Apache::loncommon::start_page('Map Contents',$js).
105: '<h1>'.$url.'</h1>');
1.12 www 106: # ------------------ This is trying to select. Provide buttons and tie %selhash
1.24 albertel 107: if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
1.38 bisitz 108: <form name="fileattr"><input type="hidden" name="acts" value="" />
109: <input type="button" name="close" value="CLOSE" onClick="self.close()" />
110: <input type="button" name="groupimport" value="GROUP IMPORT"
111: onClick="javascript:select_group()" />
1.8 www 112: </form>
113: ENDSELECT
1.12 www 114: my $diropendb =
1.41 foxr 115: LONCAPA::tempdir() .
116: "$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
1.13 albertel 117: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
1.24 albertel 118: if ($env{'form.launch'} eq '1') {
1.12 www 119: &start_fresh_session();
120: }
121: $successtied=1;
122:
123: # - Evaluate actions from previous page (both cumulatively and chronologically)
1.31 albertel 124: if ($env{'form.catalogmode'} eq 'import') {
125: &Apache::groupsort::update_actions_hash(\%selhash);
1.12 www 126: }
127: # -
128: }
1.8 www 129: }
1.12 www 130: # ----------------------------- successtied is now '1' if in working selectmode
1.15 www 131: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
132: if ($fatal==1) {
1.37 bisitz 133: $r->print('<p class="LC_warning">'
134: .&mt('Map contents are not shown in order.')
135: .'</p><br />');
1.15 www 136: }
1.8 www 137: my $idx=0;
1.45 raeburn 138: foreach my $entry (&attemptread(&Apache::lonnet::filelocation('',$url))) {
139: if (defined($entry)) {
1.8 www 140: $idx++;
1.12 www 141: if ($successtied) {
1.8 www 142: $r->print('<form name="form'.$idx.'">');
143: }
1.45 raeburn 144: my ($title,$url)=split(/\:/,$entry);
1.30 albertel 145: $title = &LONCAPA::map::qtescape($title);
146: unless ($title) { $title=(split(/\//,$url))[-1] };
147: my $enc_title = &HTML::Entities::encode($title,'\'"<>&');
148: unless ($title) {
149: $title='<i>'.&mt('Empty').'</i>';
150: $enc_title = &mt('Empty');
151: }
152: $url = &LONCAPA::map::qtescape($url);
153: my $enc_url = &HTML::Entities::encode($url,'\'"<>&');
1.8 www 154: if ($url) {
1.12 www 155: if ($successtied) {
156: my $checked='';
157: if ($selhash{'store_'.$url}) {
1.38 bisitz 158: $checked=' checked="checked"';
1.12 www 159: }
160: $selhash{"pre_${idx}_link"}=$url;
161: $selhash{"pre_${idx}_title"}=$title;
1.30 albertel 162:
163: $url = &HTML::Entities::encode($url, '\'"<>&');
1.8 www 164: $r->print(<<ENDCHECKBOX);
165: <input type='checkbox' name='filelink'
1.30 albertel 166: value='$enc_url' onClick='javascript:queue("form$idx")'$checked />
167: <input type='hidden' name='title' value='$enc_title' />
1.8 www 168: ENDCHECKBOX
169: }
1.30 albertel 170: $r->print('<a href="'.$enc_url.'">');
1.8 www 171: }
1.30 albertel 172: $r->print($enc_title);
1.8 www 173: if ($url) { $r->print('</a>'); }
1.12 www 174: if ($successtied) {
1.8 www 175: $r->print('</form>');
176: } else {
1.39 bisitz 177: $r->print('<br />');
1.8 www 178: }
179: }
180: }
1.26 albertel 181: $r->print(&Apache::loncommon::end_page());
1.12 www 182: if ($successtied) {
183: untie %selhash;
184: }
1.8 www 185: }
186:
1.12 www 187: # ----------------------------------------------------------- Clean out selhash
188: sub start_fresh_session {
1.45 raeburn 189: foreach my $item (keys(%selhash)) {
190: if ($item =~ /^pre_/) {
191: delete $selhash{$item};
1.12 www 192: }
1.45 raeburn 193: if ($item =~ /^store/) {
194: delete $selhash{$item};
1.12 www 195: }
196: }
197: }
198:
199:
1.1 www 200: # ================================================================ Main Handler
201:
202: sub handler {
203: my $r=shift;
204:
205: if ($r->header_only) {
1.16 www 206: &Apache::loncommon::content_type($r,'text/html');
1.1 www 207: $r->send_http_header;
208: return OK;
209: }
1.46 raeburn 210:
211: my $requrl=$r->uri;
1.8 www 212: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.46 raeburn 213: ['forceselect','launch','navmap']);
214:
215: if (($env{'request.course.fn'}) && ($env{'form.navmap'}) && ($env{'request.course.id'})) {
216: my $crstype = &Apache::loncommon::course_type();
217: unless (($crstype eq 'Placement') && (!$env{'request.role.adv'})) {
218:
219: # Check for critical messages and redirect if present.
220: my ($redirect,$url) = &Apache::loncommon::critical_redirect(300,'contents');
221: if ($redirect) {
222: &Apache::loncommon::content_type($r,'text/html');
223: $r->header_out(Location => $url);
224: return REDIRECT;
225: }
226:
227: # Check if course needs to be re-initialized
228: my $loncaparev = $r->dir_config('lonVersion');
229: my ($result,@reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
230:
231: if ($result eq 'switch') {
232: &Apache::loncommon::content_type($r,'text/html');
233: $r->send_http_header;
234: $r->print(&Apache::loncommon::check_release_result(@reinit));
235: return OK;
236: } elsif ($result eq 'update') {
237: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
238: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
239: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
240: if ($ferr) {
241: my $requrl = $r->uri;
242: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
243: $env{'user.reinit'} = 1;
244: return HTTP_NOT_ACCEPTABLE;
245: }
246: }
247:
248: # Create the nav map
249: my $navmap = Apache::lonnavmaps::navmap->new();
250:
251: if (ref($navmap)) {
252: # renderer call
253: if (&Apache::lonnet::is_on_map($requrl)) {
254: my $mapurl = &Apache::lonnet::declutter($requrl);
255: my @crumbs = ({text => $crstype.' Contents',
256: href => "javascript:gopost('/adm/navmaps','')"});
257: my $res = $navmap->getResourceByUrl($mapurl);
258: if (ref($res)) {
259: my ($parent) = &Apache::lonnet::decode_symb($res->symb());
260: if ($parent ne $env{'course.'.$env{'request.course.id'}.'.url'}) {
261: my @mapcrumbs = $navmap->recursed_crumbs($parent);
262: if (@mapcrumbs) {
263: push(@crumbs,@mapcrumbs);
264: }
265: }
266: }
267: my $maptitle = &Apache::lonnet::gettitle($mapurl);
268: push(@crumbs,{text => $maptitle, no_mt => 1});
269: my $args = {'bread_crumbs' => \@crumbs,
270: 'bread_crumbs_nomenu' => 1};
271: &Apache::loncommon::content_type($r,'text/html');
272: $r->send_http_header;
273:
274: $r->print(&Apache::loncommon::start_page($maptitle,undef,$args));
275:
276: my $renderArgs = { 'cols' => [0,1,2,3],
277: 'url' => $mapurl,
278: 'navmap' => $navmap,
279: 'suppressNavmap' => 1,
280: 'suppressEmptySequences' => 1,
281: 'filterFunc' => undef,
282: 'resource_no_folder_link' => 1,
283: 'r' => $r,
284: 'caller' => 'sequence',
285: 'notools' => 1,
286: 'iterator_map' => $mapurl,
287: };
288:
289: my $render = &Apache::lonnavmaps::render($renderArgs);
290:
291: # If no resources were found let the user know.
292: if ($renderArgs->{'counter'} == 0) {
293: $r->print("<p><span class=\"LC_info\">".
294: &mt("This folder is empty.")."</span></p>");
295: }
296: $r->print(&Apache::loncommon::end_page());
297: $r->rflush();
298: return OK;
299: }
300: }
301: }
302: }
1.1 www 303:
1.2 www 304: my %hash;
1.1 www 305: my %bighash;
1.2 www 306:
1.12 www 307: $successtied=0;
1.3 www 308: # ------------------------------------------------------------ Tie symb db file
1.9 www 309: my $disurl='';
310: my $dismapid='';
1.18 raeburn 311: my $exitdisid = '';
312: my $arrow_dir = '';
1.40 raeburn 313: my $is_encrypted = '';
1.9 www 314:
1.24 albertel 315: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
1.2 www 316: my $last;
1.24 albertel 317: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.13 albertel 318: &GDBM_READER(),0640)) {
1.2 www 319: $last=$hash{'last_direction'};
320: untie(%hash);
321: }
1.3 www 322: my $direction='';
323: my $prevmap='';
324: if ($last) {
1.23 albertel 325: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
1.3 www 326: }
327: # ------------------------------------------------------------- Tie big db file
1.24 albertel 328: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.13 albertel 329: &GDBM_READER(),0640)) {
1.3 www 330: my $disid='';
1.17 raeburn 331: my $randomout ='';
1.10 www 332:
1.3 www 333: if ($direction eq 'back') {
334: $disid=$bighash{'map_finish_'.$requrl};
335: } else {
336: $disid=$bighash{'map_start_'.$requrl};
1.18 raeburn 337: }
1.3 www 338: if ($disid) {
339: $disurl=$bighash{'src_'.$disid};
1.4 www 340: $dismapid=(split(/\./,$disid))[1];
1.25 albertel 341: if (!$env{'request.role.adv'}) {
342: $randomout = $bighash{'randomout_'.$disid};
343: }
1.40 raeburn 344: if (!$env{'request.role.adv'}) {
345: $is_encrypted = $bighash{'encrypted_'.$disid};
346: }
1.24 albertel 347: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.18 raeburn 348: &GDBM_READER(),0640)) {
349: $last=$hash{'last_known'};
350: untie(%hash);
1.3 www 351: }
1.18 raeburn 352:
353:
1.17 raeburn 354: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
1.18 raeburn 355: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
1.11 www 356: $direction=($direction?$direction:'forward');
357: ($disid,$requrl)=
358: &Apache::lonpageflip::fullmove($disid,
359: &Apache::lonnet::declutter($requrl),$direction);
360: if ($disid) {
361: $disurl=$bighash{'src_'.$disid};
362: $dismapid=(split(/\./,$disid))[1];
1.25 albertel 363: if (!$env{'request.role.adv'}) {
364: $randomout = $bighash{'randomout_'.$disid};
365: }
1.40 raeburn 366: if (!$env{'request.role.adv'}) {
367: $is_encrypted = $bighash{'encrypted_'.$disid};
368: }
1.11 www 369: }
370: }
1.18 raeburn 371: $exitdisid = $disid;
372: $arrow_dir = $direction;
1.11 www 373:
1.3 www 374: # --------------------------------------- Untie hash, make sure to come by here
375: untie(%bighash);
1.9 www 376: }
377: }
378:
379: # now either disurl is set (going to first page), or we need another display
380: if ($disurl) {
1.3 www 381: # -------------------------------------------------- Has first or last resource
1.40 raeburn 382: my $showdisurl = $disurl;
383: if ($is_encrypted) {
384: $showdisurl = &Apache::lonenc::encrypted($disurl);
385: }
1.23 albertel 386: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
387: 'last_known' => [$disurl,$dismapid]);
1.16 www 388: &Apache::loncommon::content_type($r,'text/html');
1.36 raeburn 389: $r->header_out(Location => &Apache::lonnet::absolute_url($ENV{'SERVER_NAME'}).
1.40 raeburn 390: $showdisurl);
1.9 www 391: return REDIRECT;
1.1 www 392: } else {
1.16 www 393: &Apache::loncommon::content_type($r,'text/html');
1.9 www 394: $r->send_http_header;
1.21 albertel 395: if ($exitdisid eq '' && $arrow_dir ne '') {
1.18 raeburn 396: my %lt =&Apache::lonlocal::texthash(
397: 'nere' => 'Next resource could not be displayed',
398: 'goba' => 'Go Back',
1.44 raeburn 399: 'nacc' => 'Course Contents',
1.18 raeburn 400: );
1.44 raeburn 401: if (&Apache::loncommon::course_type() eq 'Community') {
402: $lt{'nav'} = &mt('Community Contents');
403: }
1.42 raeburn 404: my $warnmsg;
1.18 raeburn 405: if ($arrow_dir eq 'forward') {
1.42 raeburn 406: $warnmsg = &mt('As all folders and sequences '
407: .'following the current resource were empty, '
408: .'you have now reached the end of the course.');
1.18 raeburn 409: } elsif ($arrow_dir eq 'back') {
1.43 raeburn 410: $warnmsg = &mt('As all folders and sequences '
1.42 raeburn 411: .'preceding the current resource were empty, '
412: .'you have now reached the beginning of the course.');
1.18 raeburn 413: }
1.26 albertel 414: my $start_page=
415: &Apache::loncommon::start_page('Empty Folder/Sequence');
416: my $end_page=
417: &Apache::loncommon::end_page();
1.18 raeburn 418: $r->print(<<ENDNONE);
1.26 albertel 419: $start_page
1.18 raeburn 420: <h3>$lt{'nere'}</h3>
421: <p>$warnmsg</p>
422: <ul>
423: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
424: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
425: </ul>
1.26 albertel 426: $end_page
1.18 raeburn 427: ENDNONE
428: } else {
429: &viewmap($r,$requrl);
430: }
1.9 www 431: return OK;
1.1 www 432: }
433: }
434:
435: 1;
436: __END__
437:
1.35 jms 438: =head1 NAME
439:
440: Apache::lonsequence
441:
442: =head1 SYNOPSIS
443:
444: Handler for showing sequence objects of
445: educational resources.
446:
447: This is part of the LearningOnline Network with CAPA project
448: described at http://www.lon-capa.org.
449:
450: =head1 SUBROUTINES
451:
452: =over
453:
454: =item handler()
455:
456: =item viewmap()
457:
458: =item attemptread()
1.1 www 459:
1.35 jms 460: =item mapread()
461:
462: =item start_fresh_session()
463:
464: =back
465:
466: =cut
1.1 www 467:
468:
469:
470:
471:
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