1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
5: # $Id: lonpageflip.pm,v 1.109 2021/08/09 18:51:04 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::lonpageflip;
33:
34: use strict;
35: use LONCAPA;
36: use Apache::Constants qw(:common :http REDIRECT);
37: use Apache::lonnet;
38: use Apache::loncommon();
39: use Apache::lonnavmaps();
40: use Apache::lonuserstate;
41: use Apache::lonlocal;
42: use HTML::TokeParser;
43: use GDBM_File;
44:
45: # ========================================================== Module Global Hash
46:
47: my %hash;
48:
49: sub cleanup {
50: if (tied(%hash)){
51: &Apache::lonnet::logthis('Cleanup pageflip: hash');
52: unless (untie(%hash)) {
53: &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
54: }
55: }
56: return OK;
57: }
58:
59: sub addrid {
60: my ($current,$new,$condid)=@_;
61: unless ($condid) { $condid=0; }
62:
63: if ($current) {
64: $current.=','.$new;
65: } else {
66: $current=''.$new;
67: }
68:
69: return $current;
70: }
71:
72: sub fullmove {
73: my ($rid,$mapurl,$direction)=@_;
74: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
75: &GDBM_READER(),0640)) {
76: ($rid,$mapurl)=&move($rid,$mapurl,$direction);
77: untie(%hash);
78: }
79: return($rid,$mapurl);
80: }
81:
82: sub hash_src {
83: my ($id)=@_;
84: my ($mapid,$resid)=split(/\./,$id);
85: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
86: $resid,$hash{'src_'.$id});
87: my $anchor;
88: if ($hash{'ext_'.$id} eq 'true:') {
89: if ($hash{'src_'.$id} =~ /(\#.+)$/) {
90: $anchor = $1;
91: }
92: }
93: if ($hash{'encrypted_'.$id}) {
94: return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
95: &Apache::lonenc::encrypted($symb),
96: $hash{'encrypted_'.$id},$anchor);
97: }
98: return ($hash{'src_'.$id},$symb,$hash{'encrypted_'.$id},$anchor);
99: }
100:
101: sub move {
102: my ($next,$endupmap,$direction,$firstres) = @_;
103: my $safecount=0;
104: my $allowed=0;
105: my $deeplinkonly=0;
106: my $deeplinkchecked;
107: my $deeplink_login_pc;
108: my $prev=$next;
109: my ($prevmapid)=split(/\./,$next);
110: do {
111: ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
112:
113: my $url = $hash{'src_'.$next};
114: my ($mapid,$resid)=split(/\./,$next);
115: my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
116: $resid,$url);
117: if ($url eq '' || $symb eq '') {
118: $allowed = 0;
119: } else {
120: my $nodeeplinkcheck = 0;
121: if ($hash{'is_map_'.$next}) {
122: $nodeeplinkcheck = 1;
123: }
124: my $priv = &Apache::lonnet::allowed('bre',$url,$symb,'','','','',$nodeeplinkcheck);
125: $allowed = (($priv eq 'F') || ($priv eq '2') || ($priv eq 'A'));
126: }
127: $deeplinkonly = 0;
128: if ($hash{'deeplinkonly_'.$next}) {
129: my ($value,$level) = split(/:/,$hash{'deeplinkonly_'.$next});
130: my ($state,$others,$listed,$scope,$protect) = split(/,/,$value);
131: unless (($state eq 'both') || ($hash{'is_map_'.$next})) {
132: if ($level eq 'resource') {
133: $deeplinkonly = 1;
134: } elsif ($level eq 'map') {
135: if ($scope eq 'rec') {
136: unless ($mapid == $prevmapid) {
137: unless ($deeplinkchecked) {
138: $deeplink_login_pc = &get_deeplink_login_pc();
139: $deeplinkchecked = 1;
140: }
141: if ($deeplink_login_pc) {
142: my $poss_map_pc;
143: if ($hash{'is_map_'.$next}) {
144: $poss_map_pc = $hash{'map_pc_'.$url};
145: } else {
146: $poss_map_pc = $hash{'map_pc_'.$hash{'map_id_'.$mapid}};
147: }
148: unless ($deeplink_login_pc == $poss_map_pc) {
149: unless (grep(/^$deeplink_login_pc$/,split(/,/,$hash{'map_hierarchy_'.$poss_map_pc}))) {
150: $deeplinkonly = 1;
151: }
152: }
153: } else {
154: $deeplinkonly = 1;
155: }
156: }
157: } elsif ($mapid != $prevmapid) {
158: $deeplinkonly = 1;
159: }
160: }
161: }
162: } elsif (($hash{'deeplinkonly_'.$prev}) && (!$firstres)) {
163: my ($value,$level) = split(/:/,$hash{'deeplinkonly_'.$prev});
164: my ($state,$others,$listed,$scope,$protect) = split(/,/,$value);
165: unless (($state eq 'both') || ($hash{'is_map_'.$prev})) {
166: if ($level eq 'resource') {
167: $deeplinkonly = 1;
168: } elsif ($level eq 'map') {
169: if ($scope eq 'rec') {
170: unless ($mapid == $prevmapid) {
171: unless ($deeplinkchecked) {
172: $deeplink_login_pc = &get_deeplink_login_pc();
173: $deeplinkchecked = 1;
174: }
175: if ($deeplink_login_pc) {
176: my $poss_map_pc;
177: if ($hash{'is_map_'.$prev}) {
178: $poss_map_pc = $hash{'map_pc_'.$url};
179: } else {
180: $poss_map_pc = $hash{'map_pc_'.$hash{'map_id_'.$mapid}};
181: }
182: unless ($deeplink_login_pc == $poss_map_pc) {
183: unless (grep(/^$deeplink_login_pc$/,split(/,/,$hash{'map_hierarchy_'.$poss_map_pc}))) {
184: $deeplinkonly = 1;
185: }
186: }
187: }
188: }
189: } else {
190: if ($mapid != $prevmapid) {
191: $deeplinkonly = 1;
192: }
193: }
194: }
195: }
196: }
197: $safecount++;
198: } while ( ($next)
199: && ($next!~/\,/)
200: && (
201: (!$hash{'src_'.$next})
202: || (
203: (!$env{'request.role.adv'})
204: && (($hash{'randomout_'.$next})
205: || ($deeplinkonly)
206: || ($hash{'deeplinkout_'.$next}))
207: )
208: || (!$allowed)
209: )
210: && ($safecount<10000));
211:
212: return ($next,$endupmap);
213: }
214:
215: sub get_next_possible_move {
216: my ($rid,$mapurl,$direction)=@_;
217: my $startoutrid=$rid;
218:
219: my $next='';
220:
221: my $mincond=1;
222: my $posnext='';
223: if ($direction eq 'forward') {
224: # --------------------------------------------------------------------- Forward
225: while ($hash{'type_'.$rid} eq 'finish') {
226: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
227: }
228: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
229: my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
230: my $rescond = &Apache::lonnet::docondval($condition);
231: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
232: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
233: if ($thiscond>=$mincond) {
234: if ($posnext) {
235: $posnext.=','.$id.':'.$thiscond;
236: } else {
237: $posnext=$id.':'.$thiscond;
238: }
239: if ($thiscond>$mincond) { $mincond=$thiscond; }
240: }
241: }
242: foreach my $id (split(/\,/,$posnext)) {
243: my ($linkid,$condval)=split(/\:/,$id);
244: if ($condval>=$mincond) {
245: $next=&addrid($next,$hash{'goesto_'.$linkid},
246: $hash{'condid_'.$hash{'undercond_'.$linkid}});
247: }
248: }
249: if ($hash{'is_map_'.$next}) {
250: # This jumps to the beginning of a new map (going down level)
251: if (
252: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
253: $mapurl=$hash{'src_'.$next};
254: $next=$hash{'map_start_'.$hash{'src_'.$next}};
255: } elsif (
256: # This jumps back up from an empty sequence, to a page up one level
257: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
258: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
259: }
260: } elsif
261: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
262: # This comes up from a map (coming up one level);
263: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
264: }
265: } elsif ($direction eq 'back') {
266: # ------------------------------------------------------------------- Backwards
267: while ($hash{'type_'.$rid} eq 'start') {
268: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
269: }
270: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
271: my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
272: my $rescond = &Apache::lonnet::docondval($condition);
273: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
274: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
275: if ($thiscond>=$mincond) {
276: if ($posnext) {
277: $posnext.=','.$id.':'.$thiscond;
278: } else {
279: $posnext=$id.':'.$thiscond;
280: }
281: if ($thiscond>$mincond) { $mincond=$thiscond; }
282: }
283: }
284: foreach my $id (split(/\,/,$posnext)) {
285: my ($linkid,$condval)=split(/\:/,$id);
286: if ($condval>=$mincond) {
287: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
288: $hash{'condid_'.$hash{'undercond_'.$linkid}});
289: }
290: }
291: if ($hash{'is_map_'.$next}) {
292: # This jumps to the end of a new map (going down one level)
293: if (
294: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
295: $mapurl=$hash{'src_'.$next};
296: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
297: } elsif (
298: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
299: # This jumps back up from an empty sequence, to a page up one level
300: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
301: }
302: } elsif
303: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
304: # This comes back up from a map (going up one level);
305: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
306: }
307: }
308: return ($next,$mapurl);
309: }
310:
311: sub first_accessible_resource {
312: my $furl;
313: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
314: &GDBM_READER(),0640)) {
315: $furl=$hash{'first_url'};
316: my (%args,$url,$argstr);
317: if ($furl =~ m{^/enc/}) {
318: ($url,$argstr) = split(/\?/,&Apache::lonenc::unencrypted($furl));
319: } else {
320: ($url,$argstr) = split(/\?/,$furl);
321: }
322: foreach my $pair (split(/\&/,$argstr)) {
323: my ($name,$value) = split(/=/,$pair);
324: $args{&unescape($name)} = &unescape($value);
325: }
326: my $priv = &Apache::lonnet::allowed('bre',$url,$args{'symb'});
327: my $allowed = (($priv eq 'F') || ($priv eq '2') || ($priv eq 'A'));
328: if (!$allowed) {
329: # Wow, we cannot see this ... move forward to the next one that we can see
330: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward',1);
331: # Build the new URL
332: if ($newrid eq '') {
333: $furl = '/adm/navmaps';
334: } else {
335: my ($newmapid,$newresid)=split(/\./,$newrid);
336: my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
337: $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
338: if ($hash{'encrypted_'.$newrid}) {
339: $furl=&Apache::lonenc::encrypted($furl);
340: }
341: }
342: }
343: untie(%hash);
344: return $furl;
345: } else {
346: return '/adm/navmaps';
347: }
348: }
349:
350: sub first_answerable_ressymb {
351: my $navmap = Apache::lonnavmaps::navmap->new;
352: return unless (ref($navmap));
353: my $iterator = $navmap->getIterator(undef,undef,undef,1);
354: return unless (ref($iterator));
355: my ($curRes,$result);
356: while ($curRes = $iterator->next()) {
357: if (ref($curRes) && $curRes->is_problem()) {
358: foreach my $part (@{$curRes->parts()}) {
359: if ($curRes->tries($part) < $curRes->maxtries($part)) {
360: $result = $curRes->link().'?symb='.$curRes->shown_symb();
361: last;
362: }
363: }
364: }
365: }
366: if ($result) {
367: return $result;
368: } else {
369: return &first_accessible_resource();
370: }
371: }
372:
373: sub check_http_req {
374: my ($srcref,$hostname) = @_;
375: return unless (ref($srcref) eq 'SCALAR');
376: my $usehttp;
377: if ($env{'request.course.id'}) {
378: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
379: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
380: if (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
381: ($ENV{'SERVER_PORT'} == 443) &&
382: ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
383: unless ((&Apache::lonnet::uses_sts()) ||
384: (&Apache::lonnet::waf_allssl($hostname))) {
385: $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
386: $usehttp = 1;
387: }
388: } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
389: ($ENV{'SERVER_PORT'} == 443)) {
390: unless ((&Apache::lonnet::uses_sts()) ||
391: (&Apache::lonnet::waf_allssl($hostname))) {
392: my ($url,$anchor) = ($$srcref =~ /^([^\#]+)(?:|(\#[^\#]+))$/);
393: $$srcref = $url . (($$srcref =~/\?/)? '&':'?') . 'usehttp=1' .$anchor;
394: $usehttp = 1;
395: }
396: }
397: }
398: return $usehttp;
399: }
400:
401: sub reinited_js {
402: my ($url,$cid,$timeout) = @_;
403: if (!$timeout) {
404: $timeout = 0;
405: }
406: return <<"END";
407: <script type="text/javascript">
408: // <![CDATA[
409: setTimeout(function() {
410: var newurl = '$url';
411: if (document.getElementById('LC_update_$cid')) {
412: document.getElementById('LC_update_$cid').style.display = 'none';
413: }
414: if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
415: window.location.href = "$url";
416: }
417: }, $timeout);
418: // ]]>
419: </script>
420: END
421: }
422:
423: sub get_deeplink_login_pc {
424: my $deeplink_login_pc;
425: if (($env{'request.deeplink.login'}) && ($env{'request.course.id'})) {
426: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
427: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
428: my $deeplink_symb = &Apache::loncommon::deeplink_login_symb($cnum,$cdom);
429: if ($deeplink_symb) {
430: my $loginmap;
431: if ($deeplink_symb =~ /\.(page|sequence)$/) {
432: $loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[2]);
433: } else {
434: $loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[0]);
435: }
436: $deeplink_login_pc = $hash{'map_pc_'.$loginmap};
437: }
438: }
439: return $deeplink_login_pc;
440: }
441:
442: # ================================================================ Main Handler
443:
444: sub handler {
445: my $r=shift;
446:
447: # ------------------------------------------- Set document type for header only
448:
449: if ($r->header_only) {
450: &Apache::loncommon::content_type($r,'text/html');
451: $r->send_http_header;
452: return OK;
453: }
454:
455: my %cachehash=();
456: my $multichoice=0;
457: my %multichoicehash=();
458: my %prog_state=();
459: my ($redirecturl,$redirectsymb,$enc,$anchor,$deeplinklevel);
460: my $next='';
461: my $hostname = $r->hostname();
462: my @possibilities=();
463: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
464: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
465: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
466: if ($currenturl=~m|^/enc/|) {
467: $currenturl=&Apache::lonenc::unencrypted($currenturl);
468: }
469: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
470: $currenturl=~s/^https?\:\/\///;
471: $currenturl=~s/^[^\/]+//;
472: my ($preupdatepos,$last,$reinitcheck);
473: if ($direction eq 'return') {
474: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
475: &GDBM_READER(),0640)) {
476: $last=$hash{'last_known'};
477: untie(%hash);
478: }
479: } elsif ($direction eq 'firstanswerable') {
480: my $furl = &first_answerable_ressymb();
481: my $usehttp = &check_http_req(\$furl,$hostname);
482: if (($usehttp) && ($hostname ne '')) {
483: $furl='http://'.$hostname.$furl;
484: } else {
485: $furl=&Apache::lonnet::absolute_url().$furl;
486: }
487: &Apache::loncommon::content_type($r,'text/html');
488: $r->header_out(Location => $furl);
489: return REDIRECT;
490: } elsif ($direction eq 'endplacement') {
491: &Apache::loncommon::content_type($r,'text/html');
492: $r->send_http_header;
493: $r->print(&Apache::lonplacementtest::showresult());
494: return OK;
495: }
496: if ($env{'request.course.id'}) {
497: # Check if course needs to be re-initialized
498: my $loncaparev = $r->dir_config('lonVersion');
499: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
500: if ($reinitcheck eq 'switch') {
501: &Apache::loncommon::content_type($r,'text/html');
502: $r->send_http_header;
503: $r->print(&Apache::loncommon::check_release_result(@reinit));
504: return OK;
505: } elsif ($reinitcheck eq 'update') {
506: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
507: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
508: $preupdatepos = &Apache::lonnet::symbread($currenturl);
509: unless ($direction eq 'return') {
510: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
511: &GDBM_READER(),0640)) {
512: $last=$hash{'last_known'};
513: untie(%hash);
514: }
515: }
516: &Apache::loncommon::content_type($r,'text/html');
517: $r->send_http_header;
518: $r->print(&Apache::loncommon::start_page('Content Changed'));
519: my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
520: '<br />'.
521: &mt('Your course session is being updated because of recent changes by course personnel.').
522: ' '.&mt('Please be patient').'.<br /></div>'.
523: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
524: %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
525: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
526: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
527: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished!'));
528: if ($ferr) {
529: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
530: my $requrl = $r->uri;
531: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
532: $env{'user.reinit'} = 1;
533: return HTTP_NOT_ACCEPTABLE;
534: } else {
535: if ($last) {
536: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
537: unless (&Apache::lonnet::symbverify($last,$fn)) {
538: undef($last);
539: }
540: }
541: }
542: }
543: }
544: if ($direction eq 'firstres') {
545: my $furl=&first_accessible_resource();
546: my $usehttp = &check_http_req(\$furl,$hostname);
547: if (($usehttp) && ($hostname ne '')) {
548: $furl='http://'.$hostname.$furl;
549: } else {
550: $furl=&Apache::lonnet::absolute_url().$furl;
551: }
552: if ($reinitcheck eq 'update') {
553: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
554: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
555: $r->print(&Apache::loncommon::end_page());
556: return OK;
557: } else {
558: &Apache::loncommon::content_type($r,'text/html');
559: $r->header_out(Location => $furl);
560: return REDIRECT;
561: }
562: }
563: if ($direction eq 'return') {
564: # -------------------------------------------------------- Return to last known
565: my ($newloc,$usehttp);
566: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
567: &GDBM_READER(),0640))) {
568: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
569: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
570: $newloc=$hash{'src_'.$id};
571: if ($newloc) {
572: $usehttp = &check_http_req(\$newloc,$hostname);
573: if ($hash{'encrypted_'.$id}) {
574: $newloc=&Apache::lonenc::encrypted($newloc);
575: }
576: if ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)(?:|(\#[^\#]+))$}) {
577: my ($url,$anchor) = ($1,$2);
578: if ($anchor) {
579: $newloc = $url.(($url=~/\?/)?'&':'?').'symb='.&escape($last).$anchor;
580: }
581: }
582: } else {
583: $newloc='/adm/navmaps';
584: }
585: untie %hash;
586: } else {
587: $newloc='/adm/navmaps';
588: }
589: if (($usehttp) && ($hostname ne '')) {
590: $newloc='http://'.$hostname.$newloc;
591: } else {
592: $newloc=&Apache::lonnet::absolute_url().$newloc
593: }
594: if ($reinitcheck eq 'update') {
595: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
596: $r->print(&Apache::loncommon::end_page());
597: return OK;
598: } else {
599: &Apache::loncommon::content_type($r,'text/html');
600: $r->header_out(Location => $newloc);
601: return REDIRECT;
602: }
603: }
604: #
605: # Is the current URL on the map? If not, start with last known URL
606: #
607:
608: unless (&Apache::lonnet::is_on_map($currenturl)) {
609: if ($preupdatepos) {
610: undef($preupdatepos);
611: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
612: &GDBM_READER(),0640)) {
613: $last=$hash{'last_known'};
614: untie(%hash);
615: }
616: if ($last) {
617: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
618: } else {
619: my $newloc = &Apache::lonnet::absolute_url().
620: '/adm/navmaps';
621: if ($reinitcheck eq 'update') {
622: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
623: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
624: $r->print(&Apache::loncommon::end_page());
625: return OK;
626: } else {
627: &Apache::loncommon::content_type($r,'text/html');
628: $r->header_out(Location => $newloc);
629: return REDIRECT;
630: }
631: }
632: }
633: # ------------------------------------------- Do we have any idea where we are?
634: my $position;
635: if ($preupdatepos) {
636: $position = $preupdatepos;
637: } else {
638: $position=Apache::lonnet::symbread($currenturl);
639: }
640: if ($position) {
641: # ------------------------------------------------------------------------- Yes
642: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
643: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
644: $cachehash{$startoutmap}{'last_known'}=
645: [&Apache::lonnet::declutter($currenturl),$mapnum];
646:
647: # ============================================================ Tie the big hash
648: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
649: &GDBM_READER(),0640)) {
650: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
651: '.'.$mapnum;
652:
653: # ------------------------------------------------- Move forward, backward, etc
654: my $endupmap;
655: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
656: # -------------------------------------- Do we have one and only one empty URL?
657: # We are now at at least one non-empty URL
658: # ----------------------------------------------------- Check out possibilities
659: if ($next) {
660: @possibilities=split(/\,/,$next);
661: if ($#possibilities==0) {
662: # ---------------------------------------------- Only one possibility, redirect
663: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
664: $cachehash{$endupmap}{$redirecturl}=
665: [$redirecturl,(split(/\./,$next))[1]];
666: } else {
667: # ------------------------ There are multiple possibilities for a next resource
668: $multichoice=1;
669: foreach my $id (@possibilities) {
670: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
671: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
672: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
673: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
674: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
675: $multichoicehash{'symb_'.$id} =
676: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
677: $second.'___'.$symbSrc);
678:
679: my ($choicemap,$choiceres)=split(/\./,$id);
680: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
681: my $url=$multichoicehash{'src_'.$id};
682: $cachehash{$map}{$url}=[$url,$choiceres];
683: }
684: }
685: } else {
686: # -------------------------------------------------------------- No place to go
687: $multichoice=-1;
688: if ($position && $env{'request.deeplink.login'}) {
689: my ($map,$resid,$url) = &Apache::lonnet::decode_symb($position);
690: my $mapid = $hash{'map_pc_'.&Apache::lonnet::clutter($map)};
691: my $position_deeplink = $hash{'deeplinkonly_'.$mapid.'.'.$resid};
692: if ($position_deeplink) {
693: (my $value,$deeplinklevel) = split(/:/,$position_deeplink);
694: }
695: }
696: }
697: # ----------------- The program must come past this point to untie the big hash
698: untie(%hash);
699: # --------------------------------------------------------- Store position info
700: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
701: foreach my $thismap (keys(%cachehash)) {
702: my $mapnum=$cachehash{$thismap}->{'mapnum'};
703: delete($cachehash{$thismap}->{'mapnum'});
704: &Apache::lonnet::symblist($thismap,
705: %{$cachehash{$thismap}});
706: }
707: # ============================================== Do not return before this line
708: if ($redirecturl) {
709: # ----------------------------------------------------- There is a URL to go to
710: if ($direction eq 'forward') {
711: &Apache::lonnet::linklog($currenturl,$redirecturl);
712: }
713: if ($direction eq 'back') {
714: &Apache::lonnet::linklog($redirecturl,$currenturl);
715: }
716: # ------------------------------------- Check for and display critical messages
717: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
718: unless ($redirect) {
719: my $usehttp = &check_http_req(\$redirecturl,$hostname);
720: if (($usehttp) && ($hostname ne '')) {
721: $url='http://'.$hostname.$redirecturl;
722: } else {
723: $url=&Apache::lonnet::absolute_url().$redirecturl;
724: }
725: my $addanchor;
726: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
727: $addanchor = 1;
728: $url =~ s/\#.+$//;
729: }
730: $url = &add_get_param($url, { 'symb' => $redirectsymb});
731: if ($addanchor) {
732: $url .= $anchor;
733: }
734: }
735: if ($reinitcheck eq 'update') {
736: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
737: $r->print(&reinited_js($url,$env{'request.course.id'},100));
738: $r->print(&Apache::loncommon::end_page());
739: return OK;
740: } else {
741: &Apache::loncommon::content_type($r,'text/html');
742: $r->header_out(Location => $url);
743: return REDIRECT;
744: }
745: } else {
746: # --------------------------------------------------------- There was a problem
747: &Apache::loncommon::content_type($r,'text/html');
748: $r->send_http_header;
749: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
750: 'deeplink' => 'No link available',
751: 'deeplinkres' =>
752: 'Navigation to other content is unavailable when accessing content via deep-linking',
753: 'deeplinkmap' =>
754: 'You have reached the end of the sequence of available materials for access via deep-linking',
755: 'explain' =>
756: 'You have reached the end of the sequence of materials.',
757: 'back' => 'Go Back',
758: 'nav' => 'Course Contents',
759: 'wherenext' =>
760: 'There are several possibilities of where to go next',
761: 'pick' =>
762: 'Please click on the the resource you intend to access',
763: 'titleheader' => 'Title',
764: 'type' => 'Type',
765: 'update' => 'Content updated',
766: 'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
767: 'gonav' => 'Go to the Contents page to select a resource to display.',
768: );
769: if (&Apache::loncommon::course_type() eq 'Community') {
770: $lt{'nav'} = &mt('Community Contents');
771: }
772: if ($#possibilities>0) {
773: my $start_page=
774: &Apache::loncommon::start_page('Multiple Resources');
775: $r->print(<<ENDSTART);
776: $start_page
777: <h3>$lt{'wherenext'}</h3>
778: <p>
779: $lt{'pick'}:
780: <p>
781: <table border="2">
782: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
783: ENDSTART
784: foreach my $id (@possibilities) {
785: my $src = $multichoicehash{'src_'.$id};
786: my $usehttp = &check_http_req(\$src,$hostname);
787: if (($usehttp) && ($hostname ne '')) {
788: $src = 'http://'.$hostname.$src;
789: }
790: $r->print(
791: '<tr><td><a href="'.
792: &add_get_param($src,
793: {'symb' =>
794: $multichoicehash{'symb_'.$id},
795: }).'">'.
796: $multichoicehash{'title_'.$id}.
797: '</a></td><td>'.$multichoicehash{'type_'.$id}.
798: '</td></tr>');
799: }
800: $r->print('</table>');
801: } else {
802: if ($reinitcheck) {
803: if (&Apache::loncommon::course_type() eq 'Community') {
804: $r->print(
805: &Apache::loncommon::start_page('Community Contents Updated'));
806: } else {
807: $r->print(
808: &Apache::loncommon::start_page('Course Contents Updated'));
809: }
810: $r->print('<h2>'.$lt{'update'}.'</h2>'
811: .'<p>'.$lt{'expupdate'}.'<br />'
812: .$lt{'gonav'}.'</p>');
813: } else {
814: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
815: (!$env{'request.role.adv'})) {
816: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
817: if ($incomplete) {
818: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
819: } else {
820: $r->print(&Apache::lonplacementtest::showresult(1));
821: }
822: } else {
823: $r->print(
824: &Apache::loncommon::start_page('No Resource'));
825: if ($deeplinklevel eq 'resource') {
826: $r->print('<h2>'.$lt{'deeplink'}.'</h2>'
827: .'<p>'.$lt{'deeplinkres'}.'</p>');
828: } elsif ($deeplinklevel eq 'map') {
829: $r->print('<h2>'.$lt{'title'}.'</h2>'
830: .'<p>'.$lt{'deeplinkmap'}.'</p>');
831: } else {
832: $r->print('<h2>'.$lt{'title'}.'</h2>'
833: .'<p>'.$lt{'explain'}.'</p>');
834: }
835: }
836: }
837: }
838: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
839: ($env{'request.role.adv'})) {
840: if ($deeplinklevel) {
841: $r->print(
842: &Apache::lonhtmlcommon::actionbox(
843: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a>']));
844: } elsif ((!@possibilities) && ($reinitcheck)) {
845: $r->print(
846: &Apache::lonhtmlcommon::actionbox(
847: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
848: ]));
849: } else {
850: $r->print(
851: &Apache::lonhtmlcommon::actionbox(
852: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
853: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
854: ]));
855: }
856:
857: }
858: $r->print(&Apache::loncommon::end_page());
859:
860: return OK;
861: }
862: } else {
863: # ------------------------------------------------- Problem, could not tie hash
864: if ($reinitcheck eq 'update') {
865: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
866: $r->print(&Apache::loncommon::end_page());
867: }
868: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
869: return HTTP_NOT_ACCEPTABLE;
870: }
871: } else {
872: # ---------------------------------------- No, could not determine where we are
873: my $newloc = '/adm/ambiguous';
874: if ($reinitcheck eq 'update') {
875: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
876: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
877: $r->print(&Apache::loncommon::end_page());
878: } else {
879: $r->internal_redirect($newloc);
880: }
881: return OK;
882: }
883: } else {
884: # -------------------------- Class was not initialized or page fliped strangely
885: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
886: return HTTP_NOT_ACCEPTABLE;
887: }
888: }
889:
890: 1;
891: __END__
892:
893: =pod
894:
895: =head1 NAME
896:
897: Apache::lonpageflip
898:
899: =head1 SYNOPSIS
900:
901: Deals with forward, backward, and other page flips.
902:
903: This is part of the LearningOnline Network with CAPA project
904: described at http://www.lon-capa.org.
905:
906: =head1 OVERVIEW
907:
908: (empty)
909:
910: =head1 SUBROUTINES
911:
912: =over cleanup()
913:
914: =item addrid()
915:
916: =item fullmove()
917:
918: =item hash_src()
919:
920: =item move()
921:
922: =item get_next_possible_move()
923:
924: =item first_accessible_resource()
925:
926: =item handler()
927:
928: =back
929:
930: =cut
931:
932:
933:
934:
935:
936:
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