Annotation of rat/lonsequence.pm, revision 1.53
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
1.53 ! raeburn 5: # $Id: lonsequence.pm,v 1.52 2020/09/03 12:14:30 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();
1.49 raeburn 39: use LONCAPA::ltiutils;
1.41 foxr 40: use LONCAPA;
1.28 albertel 41: use Apache::lonpageflip();
42: use Apache::loncommon();
1.31 albertel 43: use Apache::groupsort();
1.16 www 44: use Apache::lonlocal;
1.46 raeburn 45: use Apache::lonnavmaps();
46: use Apache::lonenc();
1.30 albertel 47: use HTML::Entities();
1.1 www 48:
1.12 www 49: my %selhash;
50: my $successtied;
1.8 www 51:
52: # ----------------------------------------- Attempt to read from resource space
53:
54: sub attemptread {
1.32 albertel 55: my ($fn,$unsorted)=@_;
1.8 www 56: &Apache::lonnet::repcopy($fn);
57: if (-e $fn) {
1.32 albertel 58: return &LONCAPA::map::attemptread($fn,$unsorted);
1.8 www 59: } else {
60: return ();
61: }
62: }
63:
1.15 www 64: sub mapread {
65: my $fn=shift;
66: &Apache::lonnet::repcopy($fn);
67: if (-e $fn) {
1.28 albertel 68: return &LONCAPA::map::mapread($fn,'');
1.15 www 69: } else {
70: return ();
71: }
72: }
73:
1.8 www 74: # ---------------------------------------------------------------- View Handler
75:
76: sub viewmap {
1.9 www 77: my ($r,$url)=@_;
1.26 albertel 78:
79: my $js;
80: if ($env{'form.forceselect'}) {
81: $js = (<<ENDSCRIPT);
82: <script type="text/javascript">
1.8 www 83:
84: function select_group() {
1.12 www 85: window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
1.8 www 86: }
87:
88: function queue(val) {
89: if (eval("document.forms."+val+".filelink.checked")) {
90: var l=val.length;
91: var v=val.substring(4,l);
92: document.forms.fileattr.acts.value+='1a'+v+'b';
93: }
94: else {
95: var l=val.length;
96: var v=val.substring(4,l);
97: document.forms.fileattr.acts.value+='0a'+v+'b';
98: }
99: }
100:
101: </script>
102: ENDSCRIPT
103: }
1.26 albertel 104:
105: $r->print(&Apache::loncommon::start_page('Map Contents',$js).
106: '<h1>'.$url.'</h1>');
1.12 www 107: # ------------------ This is trying to select. Provide buttons and tie %selhash
1.24 albertel 108: if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
1.38 bisitz 109: <form name="fileattr"><input type="hidden" name="acts" value="" />
110: <input type="button" name="close" value="CLOSE" onClick="self.close()" />
111: <input type="button" name="groupimport" value="GROUP IMPORT"
112: onClick="javascript:select_group()" />
1.8 www 113: </form>
114: ENDSELECT
1.12 www 115: my $diropendb =
1.41 foxr 116: LONCAPA::tempdir() .
117: "$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
1.13 albertel 118: if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
1.24 albertel 119: if ($env{'form.launch'} eq '1') {
1.12 www 120: &start_fresh_session();
121: }
122: $successtied=1;
123:
124: # - Evaluate actions from previous page (both cumulatively and chronologically)
1.31 albertel 125: if ($env{'form.catalogmode'} eq 'import') {
126: &Apache::groupsort::update_actions_hash(\%selhash);
1.12 www 127: }
128: # -
129: }
1.8 www 130: }
1.12 www 131: # ----------------------------- successtied is now '1' if in working selectmode
1.15 www 132: my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
133: if ($fatal==1) {
1.37 bisitz 134: $r->print('<p class="LC_warning">'
135: .&mt('Map contents are not shown in order.')
136: .'</p><br />');
1.15 www 137: }
1.8 www 138: my $idx=0;
1.45 raeburn 139: foreach my $entry (&attemptread(&Apache::lonnet::filelocation('',$url))) {
140: if (defined($entry)) {
1.8 www 141: $idx++;
1.12 www 142: if ($successtied) {
1.8 www 143: $r->print('<form name="form'.$idx.'">');
144: }
1.45 raeburn 145: my ($title,$url)=split(/\:/,$entry);
1.30 albertel 146: $title = &LONCAPA::map::qtescape($title);
147: unless ($title) { $title=(split(/\//,$url))[-1] };
148: my $enc_title = &HTML::Entities::encode($title,'\'"<>&');
149: unless ($title) {
150: $title='<i>'.&mt('Empty').'</i>';
151: $enc_title = &mt('Empty');
152: }
153: $url = &LONCAPA::map::qtescape($url);
154: my $enc_url = &HTML::Entities::encode($url,'\'"<>&');
1.8 www 155: if ($url) {
1.12 www 156: if ($successtied) {
157: my $checked='';
158: if ($selhash{'store_'.$url}) {
1.38 bisitz 159: $checked=' checked="checked"';
1.12 www 160: }
161: $selhash{"pre_${idx}_link"}=$url;
162: $selhash{"pre_${idx}_title"}=$title;
1.30 albertel 163:
164: $url = &HTML::Entities::encode($url, '\'"<>&');
1.8 www 165: $r->print(<<ENDCHECKBOX);
166: <input type='checkbox' name='filelink'
1.30 albertel 167: value='$enc_url' onClick='javascript:queue("form$idx")'$checked />
168: <input type='hidden' name='title' value='$enc_title' />
1.8 www 169: ENDCHECKBOX
170: }
1.30 albertel 171: $r->print('<a href="'.$enc_url.'">');
1.8 www 172: }
1.30 albertel 173: $r->print($enc_title);
1.8 www 174: if ($url) { $r->print('</a>'); }
1.12 www 175: if ($successtied) {
1.8 www 176: $r->print('</form>');
177: } else {
1.39 bisitz 178: $r->print('<br />');
1.8 www 179: }
180: }
181: }
1.26 albertel 182: $r->print(&Apache::loncommon::end_page());
1.12 www 183: if ($successtied) {
184: untie %selhash;
185: }
1.8 www 186: }
187:
1.12 www 188: # ----------------------------------------------------------- Clean out selhash
189: sub start_fresh_session {
1.45 raeburn 190: foreach my $item (keys(%selhash)) {
191: if ($item =~ /^pre_/) {
192: delete $selhash{$item};
1.12 www 193: }
1.45 raeburn 194: if ($item =~ /^store/) {
195: delete $selhash{$item};
1.12 www 196: }
197: }
198: }
199:
200:
1.1 www 201: # ================================================================ Main Handler
202:
203: sub handler {
204: my $r=shift;
205:
206: if ($r->header_only) {
1.16 www 207: &Apache::loncommon::content_type($r,'text/html');
1.1 www 208: $r->send_http_header;
209: return OK;
210: }
1.46 raeburn 211:
212: my $requrl=$r->uri;
1.8 www 213: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.46 raeburn 214: ['forceselect','launch','navmap']);
215:
216: if (($env{'request.course.fn'}) && ($env{'form.navmap'}) && ($env{'request.course.id'})) {
217: my $crstype = &Apache::loncommon::course_type();
218: unless (($crstype eq 'Placement') && (!$env{'request.role.adv'})) {
219:
220: # Check for critical messages and redirect if present.
221: my ($redirect,$url) = &Apache::loncommon::critical_redirect(300,'contents');
222: if ($redirect) {
223: &Apache::loncommon::content_type($r,'text/html');
224: $r->header_out(Location => $url);
225: return REDIRECT;
226: }
227:
228: # Check if course needs to be re-initialized
229: my $loncaparev = $r->dir_config('lonVersion');
230: my ($result,@reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
231:
232: if ($result eq 'switch') {
233: &Apache::loncommon::content_type($r,'text/html');
234: $r->send_http_header;
235: $r->print(&Apache::loncommon::check_release_result(@reinit));
236: return OK;
237: } elsif ($result eq 'update') {
238: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
239: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
240: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
241: if ($ferr) {
242: my $requrl = $r->uri;
243: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
244: $env{'user.reinit'} = 1;
245: return HTTP_NOT_ACCEPTABLE;
246: }
247: }
248:
1.51 raeburn 249: &Apache::loncommon::content_type($r,'text/html');
250: $r->send_http_header;
251:
252: my $mapurl = &Apache::lonnet::declutter($requrl);
253: my $maptitle = &Apache::lonnet::gettitle($mapurl);
254: my @crumbs = ({text => $maptitle, no_mt => 1});
255: my $args = {'bread_crumbs' => \@crumbs,
256: 'bread_crumbs_nomenu' => 1};
257:
1.46 raeburn 258: # Create the nav map
259: my $navmap = Apache::lonnavmaps::navmap->new();
260:
261: if (ref($navmap)) {
262: # renderer call
263: if (&Apache::lonnet::is_on_map($requrl)) {
1.50 raeburn 264: my ($ltiscope,$ltiuri);
1.49 raeburn 265: if (($env{'request.lti.login'}) && ($env{'request.lti.uri'})) {
266: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
267: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1.50 raeburn 268: ($ltiscope,$ltiuri) = &LONCAPA::ltiutils::lti_provider_scope($env{'request.lti.uri'},$cdom,$cnum);
1.49 raeburn 269: }
1.51 raeburn 270: @crumbs = ();
1.50 raeburn 271: unless ($ltiscope eq 'resource') {
272: unless ($ltiscope eq 'map') {
273: @crumbs = ({text => $crstype.' Contents',
274: href => "javascript:gopost('/adm/navmaps','')"});
275: }
1.49 raeburn 276: my $res = $navmap->getResourceByUrl($mapurl);
277: if (ref($res)) {
278: my $symb = $res->symb();
279: if ($symb) {
280: my ($parent) = &Apache::lonnet::decode_symb($res->symb());
1.50 raeburn 281: if (($parent ne $env{'course.'.$env{'request.course.id'}.'.url'}) &&
282: !(($ltiscope eq 'map') && ($requrl eq $ltiuri))) {
1.49 raeburn 283: my @mapcrumbs = $navmap->recursed_crumbs($parent);
284: if (@mapcrumbs) {
285: push(@crumbs,@mapcrumbs);
286: }
1.48 raeburn 287: }
1.49 raeburn 288: $env{'request.symb'} = $symb;
1.46 raeburn 289: }
290: }
291: }
292: push(@crumbs,{text => $maptitle, no_mt => 1});
1.51 raeburn 293: $args = {'bread_crumbs' => \@crumbs,
294: 'bread_crumbs_nomenu' => 1};
1.46 raeburn 295: $r->print(&Apache::loncommon::start_page($maptitle,undef,$args));
296:
297: my $renderArgs = { 'cols' => [0,1,2,3],
298: 'url' => $mapurl,
299: 'navmap' => $navmap,
300: 'suppressNavmap' => 1,
301: 'suppressEmptySequences' => 1,
302: 'filterFunc' => undef,
303: 'resource_no_folder_link' => 1,
304: 'r' => $r,
305: 'caller' => 'sequence',
306: 'notools' => 1,
307: 'iterator_map' => $mapurl,
308: };
309:
310: my $render = &Apache::lonnavmaps::render($renderArgs);
311:
312: # If no resources were found let the user know.
313: if ($renderArgs->{'counter'} == 0) {
1.51 raeburn 314: $r->print('<p class="LC_info">'.
315: &mt('No items found in folder').
316: '</p>');
1.46 raeburn 317: }
318: $r->print(&Apache::loncommon::end_page());
1.51 raeburn 319: } else {
320: $r->print(&Apache::loncommon::start_page($maptitle,undef,$args).
321: '<p class="LC_info">'.
322: &mt('Folder no longer appears to be a part of the course').
323: '</p>'.
324: &Apache::loncommon::end_page());
1.46 raeburn 325: }
1.51 raeburn 326: } else {
327: $r->print(&Apache::loncommon::start_page($maptitle,undef,$args).
328: '<p class="LC_warning">'.
329: &mt('Error: could not determine contents of folder').
330: '</p>'.
331: &Apache::loncommon::end_page());
1.46 raeburn 332: }
1.51 raeburn 333: $r->rflush();
334: return OK;
1.46 raeburn 335: }
336: }
1.1 www 337:
1.2 www 338: my %hash;
1.1 www 339: my %bighash;
1.2 www 340:
1.12 www 341: $successtied=0;
1.3 www 342: # ------------------------------------------------------------ Tie symb db file
1.9 www 343: my $disurl='';
344: my $dismapid='';
1.18 raeburn 345: my $exitdisid = '';
346: my $arrow_dir = '';
1.40 raeburn 347: my $is_encrypted = '';
1.9 www 348:
1.24 albertel 349: if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
1.2 www 350: my $last;
1.24 albertel 351: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.13 albertel 352: &GDBM_READER(),0640)) {
1.2 www 353: $last=$hash{'last_direction'};
354: untie(%hash);
355: }
1.3 www 356: my $direction='';
357: my $prevmap='';
358: if ($last) {
1.23 albertel 359: ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
1.3 www 360: }
361: # ------------------------------------------------------------- Tie big db file
1.24 albertel 362: if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.13 albertel 363: &GDBM_READER(),0640)) {
1.3 www 364: my $disid='';
1.17 raeburn 365: my $randomout ='';
1.10 www 366:
1.3 www 367: if ($direction eq 'back') {
368: $disid=$bighash{'map_finish_'.$requrl};
369: } else {
370: $disid=$bighash{'map_start_'.$requrl};
1.18 raeburn 371: }
1.3 www 372: if ($disid) {
373: $disurl=$bighash{'src_'.$disid};
1.4 www 374: $dismapid=(split(/\./,$disid))[1];
1.25 albertel 375: if (!$env{'request.role.adv'}) {
376: $randomout = $bighash{'randomout_'.$disid};
377: }
1.40 raeburn 378: if (!$env{'request.role.adv'}) {
379: $is_encrypted = $bighash{'encrypted_'.$disid};
380: }
1.24 albertel 381: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.18 raeburn 382: &GDBM_READER(),0640)) {
383: $last=$hash{'last_known'};
384: untie(%hash);
1.3 www 385: }
1.18 raeburn 386:
387:
1.17 raeburn 388: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
1.18 raeburn 389: while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
1.11 www 390: $direction=($direction?$direction:'forward');
391: ($disid,$requrl)=
392: &Apache::lonpageflip::fullmove($disid,
393: &Apache::lonnet::declutter($requrl),$direction);
394: if ($disid) {
395: $disurl=$bighash{'src_'.$disid};
396: $dismapid=(split(/\./,$disid))[1];
1.25 albertel 397: if (!$env{'request.role.adv'}) {
398: $randomout = $bighash{'randomout_'.$disid};
399: }
1.40 raeburn 400: if (!$env{'request.role.adv'}) {
401: $is_encrypted = $bighash{'encrypted_'.$disid};
402: }
1.11 www 403: }
404: }
1.18 raeburn 405: $exitdisid = $disid;
406: $arrow_dir = $direction;
1.11 www 407:
1.3 www 408: # --------------------------------------- Untie hash, make sure to come by here
409: untie(%bighash);
1.9 www 410: }
411: }
412:
413: # now either disurl is set (going to first page), or we need another display
414: if ($disurl) {
1.3 www 415: # -------------------------------------------------- Has first or last resource
1.40 raeburn 416: my $showdisurl = $disurl;
417: if ($is_encrypted) {
418: $showdisurl = &Apache::lonenc::encrypted($disurl);
419: }
1.53 ! raeburn 420: if ($disurl =~ m{^/adm/navmaps(\?|$)}) {
1.52 raeburn 421: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid]);
422: } else {
423: &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
424: 'last_known' => [$disurl,$dismapid]);
425: }
1.16 www 426: &Apache::loncommon::content_type($r,'text/html');
1.36 raeburn 427: $r->header_out(Location => &Apache::lonnet::absolute_url($ENV{'SERVER_NAME'}).
1.40 raeburn 428: $showdisurl);
1.9 www 429: return REDIRECT;
1.1 www 430: } else {
1.16 www 431: &Apache::loncommon::content_type($r,'text/html');
1.9 www 432: $r->send_http_header;
1.21 albertel 433: if ($exitdisid eq '' && $arrow_dir ne '') {
1.18 raeburn 434: my %lt =&Apache::lonlocal::texthash(
435: 'nere' => 'Next resource could not be displayed',
436: 'goba' => 'Go Back',
1.44 raeburn 437: 'nacc' => 'Course Contents',
1.18 raeburn 438: );
1.44 raeburn 439: if (&Apache::loncommon::course_type() eq 'Community') {
440: $lt{'nav'} = &mt('Community Contents');
441: }
1.42 raeburn 442: my $warnmsg;
1.18 raeburn 443: if ($arrow_dir eq 'forward') {
1.42 raeburn 444: $warnmsg = &mt('As all folders and sequences '
445: .'following the current resource were empty, '
446: .'you have now reached the end of the course.');
1.18 raeburn 447: } elsif ($arrow_dir eq 'back') {
1.43 raeburn 448: $warnmsg = &mt('As all folders and sequences '
1.42 raeburn 449: .'preceding the current resource were empty, '
450: .'you have now reached the beginning of the course.');
1.18 raeburn 451: }
1.26 albertel 452: my $start_page=
453: &Apache::loncommon::start_page('Empty Folder/Sequence');
454: my $end_page=
455: &Apache::loncommon::end_page();
1.18 raeburn 456: $r->print(<<ENDNONE);
1.26 albertel 457: $start_page
1.18 raeburn 458: <h3>$lt{'nere'}</h3>
459: <p>$warnmsg</p>
460: <ul>
461: <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
462: <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
463: </ul>
1.26 albertel 464: $end_page
1.18 raeburn 465: ENDNONE
466: } else {
467: &viewmap($r,$requrl);
468: }
1.9 www 469: return OK;
1.1 www 470: }
471: }
472:
473: 1;
474: __END__
475:
1.35 jms 476: =head1 NAME
477:
478: Apache::lonsequence
479:
480: =head1 SYNOPSIS
481:
482: Handler for showing sequence objects of
483: educational resources.
484:
485: This is part of the LearningOnline Network with CAPA project
486: described at http://www.lon-capa.org.
487:
488: =head1 SUBROUTINES
489:
490: =over
491:
492: =item handler()
493:
494: =item viewmap()
495:
496: =item attemptread()
1.1 www 497:
1.35 jms 498: =item mapread()
499:
500: =item start_fresh_session()
501:
502: =back
503:
504: =cut
1.1 www 505:
506:
507:
508:
509:
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