1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
5: # $Id: lonpageflip.pm,v 1.103 2021/04/29 17:45:25 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) = @_;
103: my $safecount=0;
104: my $allowed=0;
105: my $deeplinkonly=0;
106: my $prev=$next;
107: my ($prevmapid)=split(/\./,$next);
108: do {
109: ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
110:
111: my $url = $hash{'src_'.$next};
112: my ($mapid,$resid)=split(/\./,$next);
113: my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
114: $resid,$url);
115: if ($url eq '' || $symb eq '') {
116: $allowed = 0;
117: } else {
118: my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
119: $allowed = (($priv eq 'F') || ($priv eq '2'));
120: }
121: $deeplinkonly = 0;
122: if ($hash{'deeplinkonly_'.$next}) {
123: my ($value,$level) = split(/:/,$hash{'deeplinkonly_'.$next});
124: if ($level eq 'resource') {
125: $deeplinkonly = 1;
126: } elsif ($level eq 'map') {
127: if ($mapid != $prevmapid) {
128: $deeplinkonly = 1;
129: }
130: }
131: } elsif ($hash{'deeplinkonly_'.$prev}) {
132: my ($value,$level) = split(/:/,$hash{'deeplinkonly_'.$prev});
133: if ($level eq 'resource') {
134: $deeplinkonly = 1;
135: } elsif ($level eq 'map') {
136: if ($mapid != $prevmapid) {
137: $deeplinkonly = 1;
138: }
139: }
140: }
141: $safecount++;
142: } while ( ($next)
143: && ($next!~/\,/)
144: && (
145: (!$hash{'src_'.$next})
146: || (
147: (!$env{'request.role.adv'})
148: && (($hash{'randomout_'.$next})
149: || ($deeplinkonly))
150: )
151: || (!$allowed)
152: )
153: && ($safecount<10000));
154:
155: return ($next,$endupmap);
156: }
157:
158: sub get_next_possible_move {
159: my ($rid,$mapurl,$direction)=@_;
160: my $startoutrid=$rid;
161:
162: my $next='';
163:
164: my $mincond=1;
165: my $posnext='';
166: if ($direction eq 'forward') {
167: # --------------------------------------------------------------------- Forward
168: while ($hash{'type_'.$rid} eq 'finish') {
169: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
170: }
171: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
172: my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
173: my $rescond = &Apache::lonnet::docondval($condition);
174: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
175: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
176: if ($thiscond>=$mincond) {
177: if ($posnext) {
178: $posnext.=','.$id.':'.$thiscond;
179: } else {
180: $posnext=$id.':'.$thiscond;
181: }
182: if ($thiscond>$mincond) { $mincond=$thiscond; }
183: }
184: }
185: foreach my $id (split(/\,/,$posnext)) {
186: my ($linkid,$condval)=split(/\:/,$id);
187: if ($condval>=$mincond) {
188: $next=&addrid($next,$hash{'goesto_'.$linkid},
189: $hash{'condid_'.$hash{'undercond_'.$linkid}});
190: }
191: }
192: if ($hash{'is_map_'.$next}) {
193: # This jumps to the beginning of a new map (going down level)
194: if (
195: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
196: $mapurl=$hash{'src_'.$next};
197: $next=$hash{'map_start_'.$hash{'src_'.$next}};
198: } elsif (
199: # This jumps back up from an empty sequence, to a page up one level
200: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
201: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
202: }
203: } elsif
204: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
205: # This comes up from a map (coming up one level);
206: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
207: }
208: } elsif ($direction eq 'back') {
209: # ------------------------------------------------------------------- Backwards
210: while ($hash{'type_'.$rid} eq 'start') {
211: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
212: }
213: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
214: my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
215: my $rescond = &Apache::lonnet::docondval($condition);
216: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
217: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
218: if ($thiscond>=$mincond) {
219: if ($posnext) {
220: $posnext.=','.$id.':'.$thiscond;
221: } else {
222: $posnext=$id.':'.$thiscond;
223: }
224: if ($thiscond>$mincond) { $mincond=$thiscond; }
225: }
226: }
227: foreach my $id (split(/\,/,$posnext)) {
228: my ($linkid,$condval)=split(/\:/,$id);
229: if ($condval>=$mincond) {
230: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
231: $hash{'condid_'.$hash{'undercond_'.$linkid}});
232: }
233: }
234: if ($hash{'is_map_'.$next}) {
235: # This jumps to the end of a new map (going down one level)
236: if (
237: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
238: $mapurl=$hash{'src_'.$next};
239: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
240: } elsif (
241: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
242: # This jumps back up from an empty sequence, to a page up one level
243: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
244: }
245: } elsif
246: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
247: # This comes back up from a map (going up one level);
248: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
249: }
250: }
251: return ($next,$mapurl);
252: }
253:
254: sub first_accessible_resource {
255: my $furl;
256: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
257: &GDBM_READER(),0640)) {
258: $furl=$hash{'first_url'};
259: my %args;
260: my ($url,$args) = split(/\?/,$furl);
261: foreach my $pair (split(/\&/,$args)) {
262: my ($name,$value) = split(/=/,$pair);
263: $args{&unescape($name)} = &unescape($value);
264: }
265: if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
266: # Wow, we cannot see this ... move forward to the next one that we can see
267: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
268: # Build the new URL
269: my ($newmapid,$newresid)=split(/\./,$newrid);
270: my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
271: $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
272: if ($hash{'encrypted_'.$newrid}) {
273: $furl=&Apache::lonenc::encrypted($furl);
274: }
275: }
276: untie(%hash);
277: return $furl;
278: } else {
279: return '/adm/navmaps';
280: }
281: }
282:
283: sub first_answerable_ressymb {
284: my $navmap = Apache::lonnavmaps::navmap->new;
285: return unless (ref($navmap));
286: my $iterator = $navmap->getIterator(undef,undef,undef,1);
287: return unless (ref($iterator));
288: my ($curRes,$result);
289: while ($curRes = $iterator->next()) {
290: if (ref($curRes) && $curRes->is_problem()) {
291: foreach my $part (@{$curRes->parts()}) {
292: if ($curRes->tries($part) < $curRes->maxtries($part)) {
293: $result = $curRes->link().'?symb='.$curRes->shown_symb();
294: last;
295: }
296: }
297: }
298: }
299: if ($result) {
300: return $result;
301: } else {
302: return &first_accessible_resource();
303: }
304: }
305:
306: sub check_http_req {
307: my ($srcref,$hostname) = @_;
308: return unless (ref($srcref) eq 'SCALAR');
309: my $usehttp;
310: if ($env{'request.course.id'}) {
311: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
312: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
313: if (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
314: ($ENV{'SERVER_PORT'} == 443) &&
315: ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
316: unless ((&Apache::lonnet::uses_sts()) ||
317: (&Apache::lonnet::waf_allssl($hostname))) {
318: $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
319: $usehttp = 1;
320: }
321: } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
322: ($ENV{'SERVER_PORT'} == 443)) {
323: unless ((&Apache::lonnet::uses_sts()) ||
324: (&Apache::lonnet::waf_allssl($hostname))) {
325: my ($url,$anchor) = ($$srcref =~ /^([^\#]+)(?:|(\#[^\#]+))$/);
326: $$srcref = $url . (($$srcref =~/\?/)? '&':'?') . 'usehttp=1' .$anchor;
327: $usehttp = 1;
328: }
329: }
330: }
331: return $usehttp;
332: }
333:
334: sub reinited_js {
335: my ($url,$cid,$timeout) = @_;
336: if (!$timeout) {
337: $timeout = 0;
338: }
339: return <<"END";
340: <script type="text/javascript">
341: // <![CDATA[
342: setTimeout(function() {
343: var newurl = '$url';
344: if (document.getElementById('LC_update_$cid')) {
345: document.getElementById('LC_update_$cid').style.display = 'none';
346: }
347: if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
348: window.location.href = "$url";
349: }
350: }, $timeout);
351: // ]]>
352: </script>
353: END
354: }
355:
356: # ================================================================ Main Handler
357:
358: sub handler {
359: my $r=shift;
360:
361: # ------------------------------------------- Set document type for header only
362:
363: if ($r->header_only) {
364: &Apache::loncommon::content_type($r,'text/html');
365: $r->send_http_header;
366: return OK;
367: }
368:
369: my %cachehash=();
370: my $multichoice=0;
371: my %multichoicehash=();
372: my %prog_state=();
373: my ($redirecturl,$redirectsymb,$enc,$anchor,$deeplinklevel);
374: my $next='';
375: my $hostname = $r->hostname();
376: my @possibilities=();
377: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
378: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
379: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
380: if ($currenturl=~m|^/enc/|) {
381: $currenturl=&Apache::lonenc::unencrypted($currenturl);
382: }
383: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
384: $currenturl=~s/^https?\:\/\///;
385: $currenturl=~s/^[^\/]+//;
386: my ($preupdatepos,$last,$reinitcheck);
387: if ($direction eq 'return') {
388: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
389: &GDBM_READER(),0640)) {
390: $last=$hash{'last_known'};
391: untie(%hash);
392: }
393: } elsif ($direction eq 'firstanswerable') {
394: my $furl = &first_answerable_ressymb();
395: my $usehttp = &check_http_req(\$furl,$hostname);
396: if (($usehttp) && ($hostname ne '')) {
397: $furl='http://'.$hostname.$furl;
398: } else {
399: $furl=&Apache::lonnet::absolute_url().$furl;
400: }
401: &Apache::loncommon::content_type($r,'text/html');
402: $r->header_out(Location => $furl);
403: return REDIRECT;
404: } elsif ($direction eq 'endplacement') {
405: &Apache::loncommon::content_type($r,'text/html');
406: $r->send_http_header;
407: $r->print(&Apache::lonplacementtest::showresult());
408: return OK;
409: }
410: if ($env{'request.course.id'}) {
411: # Check if course needs to be re-initialized
412: my $loncaparev = $r->dir_config('lonVersion');
413: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
414: if ($reinitcheck eq 'switch') {
415: &Apache::loncommon::content_type($r,'text/html');
416: $r->send_http_header;
417: $r->print(&Apache::loncommon::check_release_result(@reinit));
418: return OK;
419: } elsif ($reinitcheck eq 'update') {
420: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
421: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
422: $preupdatepos = &Apache::lonnet::symbread($currenturl);
423: unless ($direction eq 'return') {
424: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
425: &GDBM_READER(),0640)) {
426: $last=$hash{'last_known'};
427: untie(%hash);
428: }
429: }
430: &Apache::loncommon::content_type($r,'text/html');
431: $r->send_http_header;
432: $r->print(&Apache::loncommon::start_page('Content Changed'));
433: my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
434: '<br />'.
435: &mt('Your course session is being updated because of recent changes by course personnel.').
436: ' '.&mt('Please be patient').'.<br /></div>'.
437: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
438: %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
439: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
440: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
441: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished!'));
442: if ($ferr) {
443: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
444: my $requrl = $r->uri;
445: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
446: $env{'user.reinit'} = 1;
447: return HTTP_NOT_ACCEPTABLE;
448: } else {
449: if ($last) {
450: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
451: unless (&Apache::lonnet::symbverify($last,$fn)) {
452: undef($last);
453: }
454: }
455: }
456: }
457: }
458: if ($direction eq 'firstres') {
459: my $furl=&first_accessible_resource();
460: my $usehttp = &check_http_req(\$furl,$hostname);
461: if (($usehttp) && ($hostname ne '')) {
462: $furl='http://'.$hostname.$furl;
463: } else {
464: $furl=&Apache::lonnet::absolute_url().$furl;
465: }
466: if ($reinitcheck eq 'update') {
467: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
468: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
469: $r->print(&Apache::loncommon::end_page());
470: return OK;
471: } else {
472: &Apache::loncommon::content_type($r,'text/html');
473: $r->header_out(Location => $furl);
474: return REDIRECT;
475: }
476: }
477: if ($direction eq 'return') {
478: # -------------------------------------------------------- Return to last known
479: my ($newloc,$usehttp);
480: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
481: &GDBM_READER(),0640))) {
482: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
483: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
484: $newloc=$hash{'src_'.$id};
485: if ($newloc) {
486: $usehttp = &check_http_req(\$newloc,$hostname);
487: if ($hash{'encrypted_'.$id}) {
488: $newloc=&Apache::lonenc::encrypted($newloc);
489: }
490: if ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)(?:|(\#[^\#]+))$}) {
491: my ($url,$anchor) = ($1,$2);
492: if ($anchor) {
493: $newloc = $url.(($url=~/\?/)?'&':'?').'symb='.&escape($last).$anchor;
494: }
495: }
496: } else {
497: $newloc='/adm/navmaps';
498: }
499: untie %hash;
500: } else {
501: $newloc='/adm/navmaps';
502: }
503: if (($usehttp) && ($hostname ne '')) {
504: $newloc='http://'.$hostname.$newloc;
505: } else {
506: $newloc=&Apache::lonnet::absolute_url().$newloc
507: }
508: if ($reinitcheck eq 'update') {
509: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
510: $r->print(&Apache::loncommon::end_page());
511: return OK;
512: } else {
513: &Apache::loncommon::content_type($r,'text/html');
514: $r->header_out(Location => $newloc);
515: return REDIRECT;
516: }
517: }
518: #
519: # Is the current URL on the map? If not, start with last known URL
520: #
521:
522: unless (&Apache::lonnet::is_on_map($currenturl)) {
523: if ($preupdatepos) {
524: undef($preupdatepos);
525: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
526: &GDBM_READER(),0640)) {
527: $last=$hash{'last_known'};
528: untie(%hash);
529: }
530: if ($last) {
531: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
532: } else {
533: my $newloc = &Apache::lonnet::absolute_url().
534: '/adm/navmaps';
535: if ($reinitcheck eq 'update') {
536: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
537: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
538: $r->print(&Apache::loncommon::end_page());
539: return OK;
540: } else {
541: &Apache::loncommon::content_type($r,'text/html');
542: $r->header_out(Location => $newloc);
543: return REDIRECT;
544: }
545: }
546: }
547: # ------------------------------------------- Do we have any idea where we are?
548: my $position;
549: if ($preupdatepos) {
550: $position = $preupdatepos;
551: } else {
552: $position=Apache::lonnet::symbread($currenturl);
553: }
554: if ($position) {
555: # ------------------------------------------------------------------------- Yes
556: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
557: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
558: $cachehash{$startoutmap}{'last_known'}=
559: [&Apache::lonnet::declutter($currenturl),$mapnum];
560:
561: # ============================================================ Tie the big hash
562: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
563: &GDBM_READER(),0640)) {
564: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
565: '.'.$mapnum;
566:
567: # ------------------------------------------------- Move forward, backward, etc
568: my $endupmap;
569: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
570: # -------------------------------------- Do we have one and only one empty URL?
571: # We are now at at least one non-empty URL
572: # ----------------------------------------------------- Check out possibilities
573: if ($next) {
574: @possibilities=split(/\,/,$next);
575: if ($#possibilities==0) {
576: # ---------------------------------------------- Only one possibility, redirect
577: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
578: $cachehash{$endupmap}{$redirecturl}=
579: [$redirecturl,(split(/\./,$next))[1]];
580: } else {
581: # ------------------------ There are multiple possibilities for a next resource
582: $multichoice=1;
583: foreach my $id (@possibilities) {
584: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
585: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
586: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
587: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
588: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
589: $multichoicehash{'symb_'.$id} =
590: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
591: $second.'___'.$symbSrc);
592:
593: my ($choicemap,$choiceres)=split(/\./,$id);
594: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
595: my $url=$multichoicehash{'src_'.$id};
596: $cachehash{$map}{$url}=[$url,$choiceres];
597: }
598: }
599: } else {
600: # -------------------------------------------------------------- No place to go
601: $multichoice=-1;
602: if ($hash{'deeplinkonly_'.$rid}) {
603: (my $value,$deeplinklevel) = split(/:/,$hash{'deeplinkonly_'.$rid});
604: }
605: }
606: # ----------------- The program must come past this point to untie the big hash
607: untie(%hash);
608: # --------------------------------------------------------- Store position info
609: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
610: foreach my $thismap (keys(%cachehash)) {
611: my $mapnum=$cachehash{$thismap}->{'mapnum'};
612: delete($cachehash{$thismap}->{'mapnum'});
613: &Apache::lonnet::symblist($thismap,
614: %{$cachehash{$thismap}});
615: }
616: # ============================================== Do not return before this line
617: if ($redirecturl) {
618: # ----------------------------------------------------- There is a URL to go to
619: if ($direction eq 'forward') {
620: &Apache::lonnet::linklog($currenturl,$redirecturl);
621: }
622: if ($direction eq 'back') {
623: &Apache::lonnet::linklog($redirecturl,$currenturl);
624: }
625: # ------------------------------------- Check for and display critical messages
626: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
627: unless ($redirect) {
628: my $usehttp = &check_http_req(\$redirecturl,$hostname);
629: if (($usehttp) && ($hostname ne '')) {
630: $url='http://'.$hostname.$redirecturl;
631: } else {
632: $url=&Apache::lonnet::absolute_url().$redirecturl;
633: }
634: my $addanchor;
635: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
636: $addanchor = 1;
637: $url =~ s/\#.+$//;
638: }
639: $url = &add_get_param($url, { 'symb' => $redirectsymb});
640: if ($addanchor) {
641: $url .= $anchor;
642: }
643: }
644: if ($reinitcheck eq 'update') {
645: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
646: $r->print(&reinited_js($url,$env{'request.course.id'},100));
647: $r->print(&Apache::loncommon::end_page());
648: return OK;
649: } else {
650: &Apache::loncommon::content_type($r,'text/html');
651: $r->header_out(Location => $url);
652: return REDIRECT;
653: }
654: } else {
655: # --------------------------------------------------------- There was a problem
656: &Apache::loncommon::content_type($r,'text/html');
657: $r->send_http_header;
658: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
659: 'deeplink' => 'No link available',
660: 'deeplinkres' =>
661: 'Navigation to other content is unavailable when accessing content via deep-linking',
662: 'deeplinkmap' =>
663: 'You have reached the end of the sequence of available materials for access via deep-linking',
664: 'explain' =>
665: 'You have reached the end of the sequence of materials.',
666: 'back' => 'Go Back',
667: 'nav' => 'Course Contents',
668: 'wherenext' =>
669: 'There are several possibilities of where to go next',
670: 'pick' =>
671: 'Please click on the the resource you intend to access',
672: 'titleheader' => 'Title',
673: 'type' => 'Type',
674: 'update' => 'Content updated',
675: 'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
676: 'gonav' => 'Go to the Contents page to select a resource to display.',
677: );
678: if (&Apache::loncommon::course_type() eq 'Community') {
679: $lt{'nav'} = &mt('Community Contents');
680: }
681: if ($#possibilities>0) {
682: my $start_page=
683: &Apache::loncommon::start_page('Multiple Resources');
684: $r->print(<<ENDSTART);
685: $start_page
686: <h3>$lt{'wherenext'}</h3>
687: <p>
688: $lt{'pick'}:
689: <p>
690: <table border="2">
691: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
692: ENDSTART
693: foreach my $id (@possibilities) {
694: my $src = $multichoicehash{'src_'.$id};
695: my $usehttp = &check_http_req(\$src,$hostname);
696: if (($usehttp) && ($hostname ne '')) {
697: $src = 'http://'.$hostname.$src;
698: }
699: $r->print(
700: '<tr><td><a href="'.
701: &add_get_param($src,
702: {'symb' =>
703: $multichoicehash{'symb_'.$id},
704: }).'">'.
705: $multichoicehash{'title_'.$id}.
706: '</a></td><td>'.$multichoicehash{'type_'.$id}.
707: '</td></tr>');
708: }
709: $r->print('</table>');
710: } else {
711: if ($reinitcheck) {
712: if (&Apache::loncommon::course_type() eq 'Community') {
713: $r->print(
714: &Apache::loncommon::start_page('Community Contents Updated'));
715: } else {
716: $r->print(
717: &Apache::loncommon::start_page('Course Contents Updated'));
718: }
719: $r->print('<h2>'.$lt{'update'}.'</h2>'
720: .'<p>'.$lt{'expupdate'}.'<br />'
721: .$lt{'gonav'}.'</p>');
722: } else {
723: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
724: (!$env{'request.role.adv'})) {
725: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
726: if ($incomplete) {
727: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
728: } else {
729: $r->print(&Apache::lonplacementtest::showresult(1));
730: }
731: } else {
732: $r->print(
733: &Apache::loncommon::start_page('No Resource'));
734: if ($deeplinklevel eq 'resource') {
735: $r->print('<h2>'.$lt{'deeplink'}.'</h2>'
736: .'<p>'.$lt{'deeplinkres'}.'</p>');
737: } elsif ($deeplinklevel eq 'map') {
738: $r->print('<h2>'.$lt{'title'}.'</h2>'
739: .'<p>'.$lt{'deeplinkmap'}.'</p>');
740: } else {
741: $r->print('<h2>'.$lt{'title'}.'</h2>'
742: .'<p>'.$lt{'explain'}.'</p>');
743: }
744: }
745: }
746: }
747: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
748: ($env{'request.role.adv'})) {
749: if ($deeplinklevel) {
750: $r->print(
751: &Apache::lonhtmlcommon::actionbox(
752: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a>']));
753: } elsif ((!@possibilities) && ($reinitcheck)) {
754: $r->print(
755: &Apache::lonhtmlcommon::actionbox(
756: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
757: ]));
758: } else {
759: $r->print(
760: &Apache::lonhtmlcommon::actionbox(
761: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
762: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
763: ]));
764: }
765:
766: }
767: $r->print(&Apache::loncommon::end_page());
768:
769: return OK;
770: }
771: } else {
772: # ------------------------------------------------- Problem, could not tie hash
773: if ($reinitcheck eq 'update') {
774: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
775: $r->print(&Apache::loncommon::end_page());
776: }
777: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
778: return HTTP_NOT_ACCEPTABLE;
779: }
780: } else {
781: # ---------------------------------------- No, could not determine where we are
782: my $newloc = '/adm/ambiguous';
783: if ($reinitcheck eq 'update') {
784: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
785: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
786: $r->print(&Apache::loncommon::end_page());
787: } else {
788: $r->internal_redirect($newloc);
789: }
790: return OK;
791: }
792: } else {
793: # -------------------------- Class was not initialized or page fliped strangely
794: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
795: return HTTP_NOT_ACCEPTABLE;
796: }
797: }
798:
799: 1;
800: __END__
801:
802: =pod
803:
804: =head1 NAME
805:
806: Apache::lonpageflip
807:
808: =head1 SYNOPSIS
809:
810: Deals with forward, backward, and other page flips.
811:
812: This is part of the LearningOnline Network with CAPA project
813: described at http://www.lon-capa.org.
814:
815: =head1 OVERVIEW
816:
817: (empty)
818:
819: =head1 SUBROUTINES
820:
821: =over cleanup()
822:
823: =item addrid()
824:
825: =item fullmove()
826:
827: =item hash_src()
828:
829: =item move()
830:
831: =item get_next_possible_move()
832:
833: =item first_accessible_resource()
834:
835: =item handler()
836:
837: =back
838:
839: =cut
840:
841:
842:
843:
844:
845:
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