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[LON-CAPA] /
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lonpageflip.pm
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1.97:
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Thu Nov 16 13:42:01 2017 UTC (6 years, 5 months ago) by
raeburn
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- If user's course session is stale, and needs updating when page flip,
student's view of grades or course contents page were requested, show
message and "indeterminate" progressbar until reinitialization complete.
1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
5: # $Id: lonpageflip.pm,v 1.97 2017/11/16 13:42:01 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 $allowed=0;
105: do {
106: ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
107:
108: my $url = $hash{'src_'.$next};
109: my ($mapid,$resid)=split(/\./,$next);
110: my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
111: $resid,$url);
112: if ($url eq '' || $symb eq '') {
113: $allowed = 0;
114: } else {
115: my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
116: $allowed = (($priv eq 'F') || ($priv eq '2'));
117: }
118: $safecount++;
119: } while ( ($next)
120: && ($next!~/\,/)
121: && (
122: (!$hash{'src_'.$next})
123: || (
124: (!$env{'request.role.adv'})
125: && $hash{'randomout_'.$next}
126: )
127: || (!$allowed)
128: )
129: && ($safecount<10000));
130:
131: return ($next,$endupmap);
132: }
133:
134: sub get_next_possible_move {
135: my ($rid,$mapurl,$direction)=@_;
136: my $startoutrid=$rid;
137:
138: my $next='';
139:
140: my $mincond=1;
141: my $posnext='';
142: if ($direction eq 'forward') {
143: # --------------------------------------------------------------------- Forward
144: while ($hash{'type_'.$rid} eq 'finish') {
145: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
146: }
147: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
148: my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
149: my $rescond = &Apache::lonnet::docondval($condition);
150: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
151: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
152: if ($thiscond>=$mincond) {
153: if ($posnext) {
154: $posnext.=','.$id.':'.$thiscond;
155: } else {
156: $posnext=$id.':'.$thiscond;
157: }
158: if ($thiscond>$mincond) { $mincond=$thiscond; }
159: }
160: }
161: foreach my $id (split(/\,/,$posnext)) {
162: my ($linkid,$condval)=split(/\:/,$id);
163: if ($condval>=$mincond) {
164: $next=&addrid($next,$hash{'goesto_'.$linkid},
165: $hash{'condid_'.$hash{'undercond_'.$linkid}});
166: }
167: }
168: if ($hash{'is_map_'.$next}) {
169: # This jumps to the beginning of a new map (going down level)
170: if (
171: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
172: $mapurl=$hash{'src_'.$next};
173: $next=$hash{'map_start_'.$hash{'src_'.$next}};
174: } elsif (
175: # This jumps back up from an empty sequence, to a page up one level
176: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
177: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
178: }
179: } elsif
180: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
181: # This comes up from a map (coming up one level);
182: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
183: }
184: } elsif ($direction eq 'back') {
185: # ------------------------------------------------------------------- Backwards
186: while ($hash{'type_'.$rid} eq 'start') {
187: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
188: }
189: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
190: my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
191: my $rescond = &Apache::lonnet::docondval($condition);
192: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
193: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
194: if ($thiscond>=$mincond) {
195: if ($posnext) {
196: $posnext.=','.$id.':'.$thiscond;
197: } else {
198: $posnext=$id.':'.$thiscond;
199: }
200: if ($thiscond>$mincond) { $mincond=$thiscond; }
201: }
202: }
203: foreach my $id (split(/\,/,$posnext)) {
204: my ($linkid,$condval)=split(/\:/,$id);
205: if ($condval>=$mincond) {
206: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
207: $hash{'condid_'.$hash{'undercond_'.$linkid}});
208: }
209: }
210: if ($hash{'is_map_'.$next}) {
211: # This jumps to the end of a new map (going down one level)
212: if (
213: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
214: $mapurl=$hash{'src_'.$next};
215: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
216: } elsif (
217: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
218: # This jumps back up from an empty sequence, to a page up one level
219: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
220: }
221: } elsif
222: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
223: # This comes back up from a map (going up one level);
224: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
225: }
226: }
227: return ($next,$mapurl);
228: }
229:
230: sub first_accessible_resource {
231: my $furl;
232: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
233: &GDBM_READER(),0640)) {
234: $furl=$hash{'first_url'};
235: my %args;
236: my ($url,$args) = split(/\?/,$furl);
237: foreach my $pair (split(/\&/,$args)) {
238: my ($name,$value) = split(/=/,$pair);
239: $args{&unescape($name)} = &unescape($value);
240: }
241: if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
242: # Wow, we cannot see this ... move forward to the next one that we can see
243: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
244: # Build the new URL
245: my ($newmapid,$newresid)=split(/\./,$newrid);
246: my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
247: $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
248: if ($hash{'encrypted_'.$newrid}) {
249: $furl=&Apache::lonenc::encrypted($furl);
250: }
251: }
252: untie(%hash);
253: return $furl;
254: } else {
255: return '/adm/navmaps';
256: }
257: }
258:
259: sub first_answerable_ressymb {
260: my $navmap = Apache::lonnavmaps::navmap->new;
261: return unless (ref($navmap));
262: my $iterator = $navmap->getIterator(undef,undef,undef,1);
263: return unless (ref($iterator));
264: my ($curRes,$result);
265: while ($curRes = $iterator->next()) {
266: if (ref($curRes) && $curRes->is_problem()) {
267: foreach my $part (@{$curRes->parts()}) {
268: if ($curRes->tries($part) < $curRes->maxtries($part)) {
269: $result = $curRes->link().'?symb='.$curRes->shown_symb();
270: last;
271: }
272: }
273: }
274: }
275: if ($result) {
276: return $result;
277: } else {
278: return &first_accessible_resource();
279: }
280: }
281:
282: sub check_http_req {
283: my ($srcref) = @_;
284: return unless (ref($srcref) eq 'SCALAR');
285: my $usehttp;
286: if ($env{'request.course.id'}) {
287: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
288: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
289: if (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
290: ($ENV{'SERVER_PORT'} == 443) &&
291: ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
292: $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
293: $usehttp = 1;
294: } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
295: ($ENV{'SERVER_PORT'} == 443)) {
296: $usehttp = 1;
297: }
298: }
299: return $usehttp;
300: }
301:
302: sub reinited_js {
303: my ($url,$cid,$timeout) = @_;
304: if (!$timeout) {
305: $timeout = 0;
306: }
307: return <<"END";
308: <script type="text/javascript">
309: // <![CDATA[
310: setTimeout(function() {
311: var newurl = '$url';
312: if (document.getElementById('LC_update_$cid')) {
313: document.getElementById('LC_update_$cid').style.display = 'none';
314: }
315: if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
316: window.location.href = "$url";
317: }
318: }, $timeout);
319: // ]]>
320: </script>
321: END
322: }
323:
324: # ================================================================ Main Handler
325:
326: sub handler {
327: my $r=shift;
328:
329: # ------------------------------------------- Set document type for header only
330:
331: if ($r->header_only) {
332: &Apache::loncommon::content_type($r,'text/html');
333: $r->send_http_header;
334: return OK;
335: }
336:
337: my %cachehash=();
338: my $multichoice=0;
339: my %multichoicehash=();
340: my %prog_state=();
341: my ($redirecturl,$redirectsymb,$enc,$anchor);
342: my $next='';
343: my $hostname = $r->hostname();
344: my @possibilities=();
345: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
346: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
347: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
348: if ($currenturl=~m|^/enc/|) {
349: $currenturl=&Apache::lonenc::unencrypted($currenturl);
350: }
351: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
352: $currenturl=~s/^https?\:\/\///;
353: $currenturl=~s/^[^\/]+//;
354: my ($preupdatepos,$last,$reinitcheck);
355: if ($direction eq 'return') {
356: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
357: &GDBM_READER(),0640)) {
358: $last=$hash{'last_known'};
359: untie(%hash);
360: }
361: } elsif ($direction eq 'firstanswerable') {
362: my $furl = &first_answerable_ressymb();
363: my $usehttp = &check_http_req(\$furl);
364: if (($usehttp) && ($hostname ne '')) {
365: $furl='http://'.$hostname.$furl;
366: } else {
367: $furl=&Apache::lonnet::absolute_url().$furl;
368: }
369: &Apache::loncommon::content_type($r,'text/html');
370: $r->header_out(Location => $furl);
371: return REDIRECT;
372: } elsif ($direction eq 'endplacement') {
373: &Apache::loncommon::content_type($r,'text/html');
374: $r->send_http_header;
375: $r->print(&Apache::lonplacementtest::showresult());
376: return OK;
377: }
378: if ($env{'request.course.id'}) {
379: # Check if course needs to be re-initialized
380: my $loncaparev = $r->dir_config('lonVersion');
381: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
382: if ($reinitcheck eq 'switch') {
383: &Apache::loncommon::content_type($r,'text/html');
384: $r->send_http_header;
385: $r->print(&Apache::loncommon::check_release_result(@reinit));
386: return OK;
387: } elsif ($reinitcheck eq 'update') {
388: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
389: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
390: $preupdatepos = &Apache::lonnet::symbread($currenturl);
391: unless ($direction eq 'return') {
392: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
393: &GDBM_READER(),0640)) {
394: $last=$hash{'last_known'};
395: untie(%hash);
396: }
397: }
398: &Apache::loncommon::content_type($r,'text/html');
399: $r->send_http_header;
400: $r->print(&Apache::loncommon::start_page('Content Changed'));
401: my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
402: '<br />'.
403: &mt('Your course session is being updated because of recent changes by course personnel.').
404: ' '.&mt('Please be patient.').'<br /></div>'.
405: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
406: %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
407: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
408: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
409: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished'));
410: if ($ferr) {
411: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
412: my $requrl = $r->uri;
413: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
414: $env{'user.reinit'} = 1;
415: return HTTP_NOT_ACCEPTABLE;
416: } else {
417: if ($last) {
418: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
419: unless (&Apache::lonnet::symbverify($last,$fn)) {
420: undef($last);
421: }
422: }
423: }
424: }
425: }
426: if ($direction eq 'firstres') {
427: my $furl=&first_accessible_resource();
428: my $usehttp = &check_http_req(\$furl);
429: if (($usehttp) && ($hostname ne '')) {
430: $furl='http://'.$hostname.$furl;
431: } else {
432: $furl=&Apache::lonnet::absolute_url().$furl;
433: }
434: if ($reinitcheck eq 'update') {
435: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
436: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
437: $r->print(&Apache::loncommon::end_page());
438: return OK;
439: } else {
440: &Apache::loncommon::content_type($r,'text/html');
441: $r->header_out(Location => $furl);
442: return REDIRECT;
443: }
444: }
445: if ($direction eq 'return') {
446: # -------------------------------------------------------- Return to last known
447: my ($newloc,$usehttp);
448: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
449: &GDBM_READER(),0640))) {
450: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
451: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
452: $newloc=$hash{'src_'.$id};
453: if ($newloc) {
454: $usehttp = &check_http_req(\$newloc);
455: if ($hash{'encrypted_'.$id}) {
456: $newloc=&Apache::lonenc::encrypted($newloc);
457: } elsif ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)\#([^\#]+)$}) {
458: $newloc = $1.&escape('#').$2;
459: }
460: } else {
461: $newloc='/adm/navmaps';
462: }
463: untie %hash;
464: } else {
465: $newloc='/adm/navmaps';
466: }
467: if (($usehttp) && ($hostname ne '')) {
468: $newloc='http://'.$hostname.$newloc;
469: } else {
470: $newloc=&Apache::lonnet::absolute_url().$newloc
471: }
472: if ($reinitcheck eq 'update') {
473: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
474: $r->print(&Apache::loncommon::end_page());
475: return OK;
476: } else {
477: &Apache::loncommon::content_type($r,'text/html');
478: $r->header_out(Location => $newloc);
479: return REDIRECT;
480: }
481: }
482: #
483: # Is the current URL on the map? If not, start with last known URL
484: #
485:
486: unless (&Apache::lonnet::is_on_map($currenturl)) {
487: if ($preupdatepos) {
488: undef($preupdatepos);
489: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
490: &GDBM_READER(),0640)) {
491: $last=$hash{'last_known'};
492: untie(%hash);
493: }
494: my $newloc;
495: if ($last) {
496: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
497: } else {
498: my $newloc = &Apache::lonnet::absolute_url().
499: '/adm/navmaps';
500: if ($reinitcheck eq 'update') {
501: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
502: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
503: $r->print(&Apache::loncommon::end_page());
504: return OK;
505: } else {
506: &Apache::loncommon::content_type($r,'text/html');
507: $r->header_out(Location => $newloc);
508: return REDIRECT;
509: }
510: }
511: }
512: # ------------------------------------------- Do we have any idea where we are?
513: my $position;
514: if ($preupdatepos) {
515: $position = $preupdatepos;
516: } else {
517: $position=Apache::lonnet::symbread($currenturl);
518: }
519: if ($position) {
520: # ------------------------------------------------------------------------- Yes
521: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
522: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
523: $cachehash{$startoutmap}{'last_known'}=
524: [&Apache::lonnet::declutter($currenturl),$mapnum];
525:
526: # ============================================================ Tie the big hash
527: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
528: &GDBM_READER(),0640)) {
529: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
530: '.'.$mapnum;
531:
532: # ------------------------------------------------- Move forward, backward, etc
533: my $endupmap;
534: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
535: # -------------------------------------- Do we have one and only one empty URL?
536: # We are now at at least one non-empty URL
537: # ----------------------------------------------------- Check out possibilities
538: if ($next) {
539: @possibilities=split(/\,/,$next);
540: if ($#possibilities==0) {
541: # ---------------------------------------------- Only one possibility, redirect
542: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
543: $cachehash{$endupmap}{$redirecturl}=
544: [$redirecturl,(split(/\./,$next))[1]];
545: } else {
546: # ------------------------ There are multiple possibilities for a next resource
547: $multichoice=1;
548: foreach my $id (@possibilities) {
549: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
550: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
551: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
552: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
553: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
554: $multichoicehash{'symb_'.$id} =
555: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
556: $second.'___'.$symbSrc);
557:
558: my ($choicemap,$choiceres)=split(/\./,$id);
559: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
560: my $url=$multichoicehash{'src_'.$id};
561: $cachehash{$map}{$url}=[$url,$choiceres];
562: }
563: }
564: } else {
565: # -------------------------------------------------------------- No place to go
566: $multichoice=-1;
567: }
568: # ----------------- The program must come past this point to untie the big hash
569: untie(%hash);
570: # --------------------------------------------------------- Store position info
571: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
572: foreach my $thismap (keys(%cachehash)) {
573: my $mapnum=$cachehash{$thismap}->{'mapnum'};
574: delete($cachehash{$thismap}->{'mapnum'});
575: &Apache::lonnet::symblist($thismap,
576: %{$cachehash{$thismap}});
577: }
578: # ============================================== Do not return before this line
579: if ($redirecturl) {
580: # ----------------------------------------------------- There is a URL to go to
581: if ($direction eq 'forward') {
582: &Apache::lonnet::linklog($currenturl,$redirecturl);
583: }
584: if ($direction eq 'back') {
585: &Apache::lonnet::linklog($redirecturl,$currenturl);
586: }
587: # ------------------------------------- Check for and display critical messages
588: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
589: unless ($redirect) {
590: my $usehttp = &check_http_req(\$redirecturl);
591: if (($usehttp) && ($hostname ne '')) {
592: $url='http://'.$hostname.$redirecturl;
593: } else {
594: $url=&Apache::lonnet::absolute_url().$redirecturl;
595: }
596: my $addanchor;
597: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
598: $addanchor = 1;
599: $url =~ s/\#.+$//;
600: }
601: $url = &add_get_param($url, { 'symb' => $redirectsymb});
602: if ($addanchor) {
603: $url .= $anchor;
604: }
605: }
606: if ($reinitcheck eq 'update') {
607: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
608: $r->print(&reinited_js($url,$env{'request.course.id'},100));
609: $r->print(&Apache::loncommon::end_page());
610: return OK;
611: } else {
612: &Apache::loncommon::content_type($r,'text/html');
613: $r->header_out(Location => $url);
614: return REDIRECT;
615: }
616: } else {
617: # --------------------------------------------------------- There was a problem
618: &Apache::loncommon::content_type($r,'text/html');
619: $r->send_http_header;
620: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
621: 'explain' =>
622: 'You have reached the end of the sequence of materials.',
623: 'back' => 'Go Back',
624: 'nav' => 'Course Contents',
625: 'wherenext' =>
626: 'There are several possibilities of where to go next',
627: 'pick' =>
628: 'Please click on the the resource you intend to access',
629: 'titleheader' => 'Title',
630: 'type' => 'Type',
631: 'update' => 'Content updated',
632: 'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
633: 'gonav' => 'Go to the Contents page to select a resource to display.',
634: );
635: if (&Apache::loncommon::course_type() eq 'Community') {
636: $lt{'nav'} = &mt('Community Contents');
637: }
638: if ($#possibilities>0) {
639: my $start_page=
640: &Apache::loncommon::start_page('Multiple Resources');
641: $r->print(<<ENDSTART);
642: $start_page
643: <h3>$lt{'wherenext'}</h3>
644: <p>
645: $lt{'pick'}:
646: <p>
647: <table border="2">
648: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
649: ENDSTART
650: foreach my $id (@possibilities) {
651: my $src = $multichoicehash{'src_'.$id};
652: my $usehttp = &check_http_req(\$src);
653: if (($usehttp) && ($hostname ne '')) {
654: $src = 'http://'.$hostname.$src;
655: }
656: $r->print(
657: '<tr><td><a href="'.
658: &add_get_param($src,
659: {'symb' =>
660: $multichoicehash{'symb_'.$id},
661: }).'">'.
662: $multichoicehash{'title_'.$id}.
663: '</a></td><td>'.$multichoicehash{'type_'.$id}.
664: '</td></tr>');
665: }
666: $r->print('</table>');
667: } else {
668: if ($reinitcheck) {
669: if (&Apache::loncommon::course_type() eq 'Community') {
670: $r->print(
671: &Apache::loncommon::start_page('Community Contents Updated'));
672: } else {
673: $r->print(
674: &Apache::loncommon::start_page('Course Contents Updated'));
675: }
676: $r->print('<h2>'.$lt{'update'}.'</h2>'
677: .'<p>'.$lt{'expupdate'}.'<br />'
678: .$lt{'gonav'}.'</p>');
679: } else {
680: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
681: (!$env{'request.role.adv'})) {
682: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
683: if ($incomplete) {
684: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
685: } else {
686: $r->print(&Apache::lonplacementtest::showresult(1));
687: }
688: } else {
689: $r->print(
690: &Apache::loncommon::start_page('No Resource')
691: .'<h2>'.$lt{'title'}.'</h2>'
692: .'<p>'.$lt{'explain'}.'</p>');
693: }
694: }
695: }
696: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
697: ($env{'request.role.adv'})) {
698: if ((!@possibilities) && ($reinitcheck)) {
699: $r->print(
700: &Apache::lonhtmlcommon::actionbox(
701: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
702: ]));
703: } else {
704: $r->print(
705: &Apache::lonhtmlcommon::actionbox(
706: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
707: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
708: ]));
709: }
710:
711: }
712: $r->print(&Apache::loncommon::end_page());
713:
714: return OK;
715: }
716: } else {
717: # ------------------------------------------------- Problem, could not tie hash
718: if ($reinitcheck eq 'update') {
719: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
720: $r->print(&Apache::loncommon::end_page());
721: }
722: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
723: return HTTP_NOT_ACCEPTABLE;
724: }
725: } else {
726: # ---------------------------------------- No, could not determine where we are
727: my $newloc = '/adm/ambiguous';
728: if ($reinitcheck eq 'update') {
729: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
730: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
731: $r->print(&Apache::loncommon::end_page());
732: } else {
733: $r->internal_redirect($newloc);
734: }
735: return OK;
736: }
737: } else {
738: # -------------------------- Class was not initialized or page fliped strangely
739: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
740: return HTTP_NOT_ACCEPTABLE;
741: }
742: }
743:
744: 1;
745: __END__
746:
747: =pod
748:
749: =head1 NAME
750:
751: Apache::lonpageflip
752:
753: =head1 SYNOPSIS
754:
755: Deals with forward, backward, and other page flips.
756:
757: This is part of the LearningOnline Network with CAPA project
758: described at http://www.lon-capa.org.
759:
760: =head1 OVERVIEW
761:
762: (empty)
763:
764: =head1 SUBROUTINES
765:
766: =over cleanup()
767:
768: =item addrid()
769:
770: =item fullmove()
771:
772: =item hash_src()
773:
774: =item move()
775:
776: =item get_next_possible_move()
777:
778: =item first_accessible_resource()
779:
780: =item handler()
781:
782: =back
783:
784: =cut
785:
786:
787:
788:
789:
790:
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