1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
5: # $Id: lonpageflip.pm,v 1.114 2022/10/29 18:13:29 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,$level) = map { &unescape($_); } 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) = map { &unescape($_); } split(/:/,$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: $r->print(&Apache::loncommon::check_release_result(@reinit));
504: return OK;
505: }
506: my ($cnum,$cdom);
507: if ($reinitcheck) {
508: $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
509: $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
510: }
511: if (($reinitcheck eq 'main') || ($reinitcheck eq 'both')) {
512: $preupdatepos = &Apache::lonnet::symbread($currenturl);
513: unless ($direction eq 'return') {
514: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
515: &GDBM_READER(),0640)) {
516: $last=$hash{'last_known'};
517: untie(%hash);
518: }
519: }
520: &Apache::loncommon::content_type($r,'text/html');
521: $r->send_http_header;
522: $r->print(&Apache::loncommon::start_page('Content Changed'));
523: my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
524: '<br />'.
525: &mt('Your course session is being updated because of recent changes by course personnel.').
526: ' '.&mt('Please be patient').'.<br /></div>'.
527: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
528: %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
529: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
530: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
531: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished!'));
532: if ($ferr) {
533: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
534: my $requrl = $r->uri;
535: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
536: $env{'user.reinit'} = 1;
537: return HTTP_NOT_ACCEPTABLE;
538: } else {
539: if ($last) {
540: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
541: unless (&Apache::lonnet::symbverify($last,$fn)) {
542: undef($last);
543: }
544: }
545: }
546: }
547: if (($reinitcheck eq 'both') || ($reinitcheck eq 'supp')) {
548: my $possdel;
549: if ($reinitcheck eq 'supp') {
550: $possdel = 1;
551: }
552: my ($supplemental,$refs_updated) = &Apache::loncommon::get_supplemental($cnum,$cdom,'',$possdel);
553: unless ($refs_updated) {
554: &Apache::loncommon::set_supp_httprefs($cnum,$cdom,$supplemental);
555: }
556: }
557: }
558: if ($direction eq 'firstres') {
559: my $furl=&first_accessible_resource();
560: my $usehttp = &check_http_req(\$furl,$hostname);
561: if (($usehttp) && ($hostname ne '')) {
562: $furl='http://'.$hostname.$furl;
563: } else {
564: $furl=&Apache::lonnet::absolute_url().$furl;
565: }
566: if ($reinitcheck eq 'update') {
567: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
568: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
569: $r->print(&Apache::loncommon::end_page());
570: return OK;
571: } else {
572: &Apache::loncommon::content_type($r,'text/html');
573: $r->header_out(Location => $furl);
574: return REDIRECT;
575: }
576: }
577: if ($direction eq 'return') {
578: # -------------------------------------------------------- Return to last known
579: my ($newloc,$usehttp);
580: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
581: &GDBM_READER(),0640))) {
582: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
583: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
584: $newloc=$hash{'src_'.$id};
585: if ($newloc) {
586: $usehttp = &check_http_req(\$newloc,$hostname);
587: if ($hash{'encrypted_'.$id}) {
588: $newloc=&Apache::lonenc::encrypted($newloc);
589: }
590: if ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)(?:|(\#[^\#]+))$}) {
591: my ($url,$anchor) = ($1,$2);
592: if ($anchor) {
593: $newloc = $url.(($url=~/\?/)?'&':'?').'symb='.&escape($last).$anchor;
594: }
595: }
596: } else {
597: $newloc='/adm/navmaps';
598: }
599: untie %hash;
600: } else {
601: $newloc='/adm/navmaps';
602: }
603: if (($usehttp) && ($hostname ne '')) {
604: $newloc='http://'.$hostname.$newloc;
605: } else {
606: $newloc=&Apache::lonnet::absolute_url().$newloc
607: }
608: if ($reinitcheck eq 'update') {
609: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
610: $r->print(&Apache::loncommon::end_page());
611: return OK;
612: } else {
613: &Apache::loncommon::content_type($r,'text/html');
614: $r->header_out(Location => $newloc);
615: return REDIRECT;
616: }
617: }
618: #
619: # Is the current URL on the map? If not, start with last known URL
620: #
621:
622: unless (&Apache::lonnet::is_on_map($currenturl)) {
623: if ($preupdatepos) {
624: undef($preupdatepos);
625: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
626: &GDBM_READER(),0640)) {
627: $last=$hash{'last_known'};
628: untie(%hash);
629: }
630: if ($last) {
631: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
632: } else {
633: my $newloc = &Apache::lonnet::absolute_url().
634: '/adm/navmaps';
635: if ($reinitcheck eq 'update') {
636: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
637: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
638: $r->print(&Apache::loncommon::end_page());
639: return OK;
640: } else {
641: &Apache::loncommon::content_type($r,'text/html');
642: $r->header_out(Location => $newloc);
643: return REDIRECT;
644: }
645: }
646: }
647: # ------------------------------------------- Do we have any idea where we are?
648: my $position;
649: if ($preupdatepos) {
650: $position = $preupdatepos;
651: } else {
652: $position=Apache::lonnet::symbread($currenturl);
653: }
654: if ($position) {
655: # ------------------------------------------------------------------------- Yes
656: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
657: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
658: $cachehash{$startoutmap}{'last_known'}=
659: [&Apache::lonnet::declutter($currenturl),$mapnum];
660:
661: # ============================================================ Tie the big hash
662: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
663: &GDBM_READER(),0640)) {
664: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
665: '.'.$mapnum;
666:
667: # ------------------------------------------------- Move forward, backward, etc
668: my $endupmap;
669: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
670: # -------------------------------------- Do we have one and only one empty URL?
671: # We are now at at least one non-empty URL
672: # ----------------------------------------------------- Check out possibilities
673: if ($next) {
674: @possibilities=split(/\,/,$next);
675: if ($#possibilities==0) {
676: # ---------------------------------------------- Only one possibility, redirect
677: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
678: $cachehash{$endupmap}{$redirecturl}=
679: [$redirecturl,(split(/\./,$next))[1]];
680: } else {
681: # ------------------------ There are multiple possibilities for a next resource
682: $multichoice=1;
683: foreach my $id (@possibilities) {
684: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
685: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
686: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
687: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
688: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
689: $multichoicehash{'symb_'.$id} =
690: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
691: $second.'___'.$symbSrc);
692:
693: my ($choicemap,$choiceres)=split(/\./,$id);
694: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
695: my $url=$multichoicehash{'src_'.$id};
696: $cachehash{$map}{$url}=[$url,$choiceres];
697: }
698: }
699: } else {
700: # -------------------------------------------------------------- No place to go
701: $multichoice=-1;
702: if ($position && $env{'request.deeplink.login'}) {
703: my ($map,$resid,$url) = &Apache::lonnet::decode_symb($position);
704: my $mapid = $hash{'map_pc_'.&Apache::lonnet::clutter($map)};
705: my $position_deeplink = $hash{'deeplinkonly_'.$mapid.'.'.$resid};
706: if ($position_deeplink) {
707: (my $value,$deeplinklevel) = map { &unescape($_); }
708: split(/:/,$position_deeplink);
709: }
710: }
711: }
712: # ----------------- The program must come past this point to untie the big hash
713: untie(%hash);
714: # --------------------------------------------------------- Store position info
715: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
716: foreach my $thismap (keys(%cachehash)) {
717: my $mapnum=$cachehash{$thismap}->{'mapnum'};
718: delete($cachehash{$thismap}->{'mapnum'});
719: &Apache::lonnet::symblist($thismap,
720: %{$cachehash{$thismap}});
721: }
722: # ============================================== Do not return before this line
723: if ($redirecturl) {
724: # ----------------------------------------------------- There is a URL to go to
725: if ($direction eq 'forward') {
726: &Apache::lonnet::linklog($currenturl,$redirecturl);
727: }
728: if ($direction eq 'back') {
729: &Apache::lonnet::linklog($redirecturl,$currenturl);
730: }
731: # ------------------------------------- Check for and display critical messages
732: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
733: unless ($redirect) {
734: my $usehttp = &check_http_req(\$redirecturl,$hostname);
735: if (($usehttp) && ($hostname ne '')) {
736: $url='http://'.$hostname.$redirecturl;
737: } else {
738: $url=&Apache::lonnet::absolute_url().$redirecturl;
739: }
740: my $addanchor;
741: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
742: $addanchor = 1;
743: $url =~ s/\#.+$//;
744: }
745: $url = &add_get_param($url, { 'symb' => $redirectsymb});
746: if ($addanchor) {
747: $url .= $anchor;
748: }
749: }
750: if ($reinitcheck eq 'update') {
751: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
752: $r->print(&reinited_js($url,$env{'request.course.id'},100));
753: $r->print(&Apache::loncommon::end_page());
754: return OK;
755: } else {
756: &Apache::loncommon::content_type($r,'text/html');
757: $r->header_out(Location => $url);
758: return REDIRECT;
759: }
760: } else {
761: # --------------------------------------------------------- There was a problem
762: &Apache::loncommon::content_type($r,'text/html');
763: $r->send_http_header;
764: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
765: 'deeplink' => 'No link available',
766: 'deeplinkres' =>
767: 'Navigation to other content is unavailable when accessing content via deep-linking',
768: 'deeplinkmap' =>
769: 'You have reached the end of the sequence of available materials for access via deep-linking',
770: 'explain' =>
771: 'You have reached the end of the sequence of materials.',
772: 'back' => 'Go Back',
773: 'nav' => 'Course Contents',
774: 'wherenext' =>
775: 'There are several possibilities of where to go next',
776: 'pick' =>
777: 'Please click on the the resource you intend to access',
778: 'titleheader' => 'Title',
779: 'type' => 'Type',
780: 'update' => 'Content updated',
781: 'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
782: 'gonav' => 'Go to the Contents page to select a resource to display.',
783: );
784: if (&Apache::loncommon::course_type() eq 'Community') {
785: $lt{'nav'} = &mt('Community Contents');
786: }
787: if ($#possibilities>0) {
788: my $start_page=
789: &Apache::loncommon::start_page('Multiple Resources');
790: $r->print(<<ENDSTART);
791: $start_page
792: <h3>$lt{'wherenext'}</h3>
793: <p>
794: $lt{'pick'}:
795: <p>
796: <table border="2">
797: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
798: ENDSTART
799: foreach my $id (@possibilities) {
800: my $src = $multichoicehash{'src_'.$id};
801: my $usehttp = &check_http_req(\$src,$hostname);
802: if (($usehttp) && ($hostname ne '')) {
803: $src = 'http://'.$hostname.$src;
804: }
805: $r->print(
806: '<tr><td><a href="'.
807: &add_get_param($src,
808: {'symb' =>
809: $multichoicehash{'symb_'.$id},
810: }).'">'.
811: $multichoicehash{'title_'.$id}.
812: '</a></td><td>'.$multichoicehash{'type_'.$id}.
813: '</td></tr>');
814: }
815: $r->print('</table>');
816: } else {
817: if ($reinitcheck) {
818: if (&Apache::loncommon::course_type() eq 'Community') {
819: $r->print(
820: &Apache::loncommon::start_page('Community Contents Updated'));
821: } else {
822: $r->print(
823: &Apache::loncommon::start_page('Course Contents Updated'));
824: }
825: $r->print('<h2>'.$lt{'update'}.'</h2>'
826: .'<p>'.$lt{'expupdate'}.'<br />'
827: .$lt{'gonav'}.'</p>');
828: } else {
829: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
830: (!$env{'request.role.adv'})) {
831: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
832: if ($incomplete) {
833: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
834: } else {
835: $r->print(&Apache::lonplacementtest::showresult(1));
836: }
837: } else {
838: $r->print(
839: &Apache::loncommon::start_page('No Resource'));
840: if ($deeplinklevel eq 'resource') {
841: $r->print('<h2>'.$lt{'deeplink'}.'</h2>'
842: .'<p>'.$lt{'deeplinkres'}.'</p>');
843: } elsif ($deeplinklevel eq 'map') {
844: $r->print('<h2>'.$lt{'title'}.'</h2>'
845: .'<p>'.$lt{'deeplinkmap'}.'</p>');
846: } else {
847: $r->print('<h2>'.$lt{'title'}.'</h2>'
848: .'<p>'.$lt{'explain'}.'</p>');
849: }
850: }
851: }
852: }
853: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
854: (!$env{'request.role.adv'})) {
855: if ($deeplinklevel) {
856: $r->print(
857: &Apache::lonhtmlcommon::actionbox(
858: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a>']));
859: } elsif ((!@possibilities) && ($reinitcheck)) {
860: $r->print(
861: &Apache::lonhtmlcommon::actionbox(
862: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
863: ]));
864: } else {
865: $r->print(
866: &Apache::lonhtmlcommon::actionbox(
867: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
868: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
869: ]));
870: }
871:
872: }
873: $r->print(&Apache::loncommon::end_page());
874:
875: return OK;
876: }
877: } else {
878: # ------------------------------------------------- Problem, could not tie hash
879: if ($reinitcheck eq 'update') {
880: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
881: $r->print(&Apache::loncommon::end_page());
882: }
883: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
884: return HTTP_NOT_ACCEPTABLE;
885: }
886: } else {
887: # ---------------------------------------- No, could not determine where we are
888: my $newloc = '/adm/ambiguous';
889: if ($reinitcheck eq 'update') {
890: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
891: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
892: $r->print(&Apache::loncommon::end_page());
893: } else {
894: $r->internal_redirect($newloc);
895: }
896: return OK;
897: }
898: } else {
899: # -------------------------- Class was not initialized or page fliped strangely
900: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
901: return HTTP_NOT_ACCEPTABLE;
902: }
903: }
904:
905: 1;
906: __END__
907:
908: =pod
909:
910: =head1 NAME
911:
912: Apache::lonpageflip
913:
914: =head1 SYNOPSIS
915:
916: Deals with forward, backward, and other page flips.
917:
918: This is part of the LearningOnline Network with CAPA project
919: described at http://www.lon-capa.org.
920:
921: =head1 OVERVIEW
922:
923: (empty)
924:
925: =head1 SUBROUTINES
926:
927: =over cleanup()
928:
929: =item addrid()
930:
931: =item fullmove()
932:
933: =item hash_src()
934:
935: =item move()
936:
937: =item get_next_possible_move()
938:
939: =item first_accessible_resource()
940:
941: =item handler()
942:
943: =back
944:
945: =cut
946:
947:
948:
949:
950:
951:
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