Annotation of rat/lonpageflip.pm, revision 1.99
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.99 ! raeburn 5: # $Id: lonpageflip.pm,v 1.98 2018/11/13 03:59:17 raeburn Exp $
1.18 www 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.1 www 29:
1.76 jms 30:
31:
1.1 www 32: package Apache::lonpageflip;
33:
34: use strict;
1.68 albertel 35: use LONCAPA;
1.4 www 36: use Apache::Constants qw(:common :http REDIRECT);
1.53 albertel 37: use Apache::lonnet;
1.70 albertel 38: use Apache::loncommon();
1.91 raeburn 39: use Apache::lonnavmaps();
1.87 raeburn 40: use Apache::lonuserstate;
1.84 raeburn 41: use Apache::lonlocal;
1.1 www 42: use HTML::TokeParser;
43: use GDBM_File;
44:
1.3 www 45: # ========================================================== Module Global Hash
46:
1.1 www 47: my %hash;
1.34 www 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: }
1.63 albertel 56: return OK;
1.34 www 57: }
1.1 www 58:
1.3 www 59: sub addrid {
1.4 www 60: my ($current,$new,$condid)=@_;
61: unless ($condid) { $condid=0; }
1.27 www 62:
1.3 www 63: if ($current) {
1.5 www 64: $current.=','.$new;
1.3 www 65: } else {
1.5 www 66: $current=''.$new;
1.3 www 67: }
1.27 www 68:
1.3 www 69: return $current;
1.25 www 70: }
71:
72: sub fullmove {
73: my ($rid,$mapurl,$direction)=@_;
1.53 albertel 74: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 75: &GDBM_READER(),0640)) {
1.25 www 76: ($rid,$mapurl)=&move($rid,$mapurl,$direction);
77: untie(%hash);
78: }
79: return($rid,$mapurl);
1.1 www 80: }
81:
1.50 albertel 82: sub hash_src {
83: my ($id)=@_;
1.56 albertel 84: my ($mapid,$resid)=split(/\./,$id);
85: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
86: $resid,$hash{'src_'.$id});
1.90 raeburn 87: my $anchor;
88: if ($hash{'ext_'.$id} eq 'true:') {
89: if ($hash{'src_'.$id} =~ /(\#.+)$/) {
90: $anchor = $1;
91: }
92: }
1.50 albertel 93: if ($hash{'encrypted_'.$id}) {
1.56 albertel 94: return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
1.90 raeburn 95: &Apache::lonenc::encrypted($symb),
96: $hash{'encrypted_'.$id},$anchor);
1.50 albertel 97: }
1.90 raeburn 98: return ($hash{'src_'.$id},$symb,$hash{'encrypted_'.$id},$anchor);
1.50 albertel 99: }
100:
1.15 www 101: sub move {
1.72 albertel 102: my ($next,$endupmap,$direction) = @_;
103: my $safecount=0;
104: my $allowed=0;
1.98 raeburn 105: my $deeplinkonly=0;
106: my $prev=$next;
107: my ($prevmapid)=split(/\./,$next);
1.72 albertel 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: }
1.98 raeburn 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: }
1.72 albertel 141: $safecount++;
142: } while ( ($next)
143: && ($next!~/\,/)
144: && (
145: (!$hash{'src_'.$next})
146: || (
1.98 raeburn 147: (!$env{'request.role.adv'})
148: && (($hash{'randomout_'.$next})
149: || ($deeplinkonly))
1.72 albertel 150: )
151: || (!$allowed)
152: )
153: && ($safecount<10000));
154:
155: return ($next,$endupmap);
156: }
157:
158: sub get_next_possible_move {
1.15 www 159: my ($rid,$mapurl,$direction)=@_;
1.23 www 160: my $startoutrid=$rid;
1.15 www 161:
162: my $next='';
163:
164: my $mincond=1;
165: my $posnext='';
166: if ($direction eq 'forward') {
167: # --------------------------------------------------------------------- Forward
1.33 www 168: while ($hash{'type_'.$rid} eq 'finish') {
169: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15 www 170: }
1.61 albertel 171: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.64 albertel 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>=$mincond) {
1.15 www 177: if ($posnext) {
1.61 albertel 178: $posnext.=','.$id.':'.$thiscond;
1.15 www 179: } else {
1.61 albertel 180: $posnext=$id.':'.$thiscond;
1.15 www 181: }
182: if ($thiscond>$mincond) { $mincond=$thiscond; }
183: }
1.61 albertel 184: }
185: foreach my $id (split(/\,/,$posnext)) {
186: my ($linkid,$condval)=split(/\:/,$id);
1.15 www 187: if ($condval>=$mincond) {
188: $next=&addrid($next,$hash{'goesto_'.$linkid},
189: $hash{'condid_'.$hash{'undercond_'.$linkid}});
190: }
1.61 albertel 191: }
1.15 www 192: if ($hash{'is_map_'.$next}) {
1.23 www 193: # This jumps to the beginning of a new map (going down level)
1.15 www 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}};
1.47 raeburn 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(/\./,$next))[0]};
1.15 www 202: }
1.23 www 203: } elsif
204: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
205: # This comes up from a map (coming up one level);
206: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61 albertel 207: }
1.15 www 208: } elsif ($direction eq 'back') {
209: # ------------------------------------------------------------------- Backwards
1.33 www 210: while ($hash{'type_'.$rid} eq 'start') {
211: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
212: }
1.62 albertel 213: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
1.64 albertel 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:$linkcond;
1.62 albertel 218: if ($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_'.$linkid}});
232: }
233: }
1.15 www 234: if ($hash{'is_map_'.$next}) {
1.24 www 235: # This jumps to the end of a new map (going down one level)
1.15 www 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}};
1.47 raeburn 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(/\./,$next))[0]};
244: }
1.24 www 245: } elsif
246: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
247: # This comes back up from a map (going up one level);
248: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 249: }
250: }
251: return ($next,$mapurl);
252: }
253:
1.69 www 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'};
1.74 albertel 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,$args{'symb'})) {
1.69 www 266: # Wow, we cannot see this ... move forward to the next one that we can see
267: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
268: # Build the new URL
1.73 albertel 269: my ($newmapid,$newresid)=split(/\./,$newrid);
1.69 www 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:
1.91 raeburn 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 $result;
301: } else {
302: return &first_accessible_resource();
303: }
304: }
305:
1.95 raeburn 306: sub check_http_req {
1.92 raeburn 307: my ($srcref) = @_;
308: return unless (ref($srcref) eq 'SCALAR');
1.93 raeburn 309: my $usehttp;
1.92 raeburn 310: if ($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 (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
314: ($ENV{'SERVER_PORT'} == 443) &&
315: ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
1.99 ! raeburn 316: unless (&Apache::lonnet::uses_sts()) {
! 317: $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
! 318: $usehttp = 1;
! 319: }
1.95 raeburn 320: } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
321: ($ENV{'SERVER_PORT'} == 443)) {
1.99 ! raeburn 322: unless (&Apache::lonnet::uses_sts()) {
! 323: $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
! 324: $usehttp = 1;
! 325: }
1.92 raeburn 326: }
327: }
1.93 raeburn 328: return $usehttp;
1.92 raeburn 329: }
330:
1.97 raeburn 331: sub reinited_js {
332: my ($url,$cid,$timeout) = @_;
333: if (!$timeout) {
334: $timeout = 0;
335: }
336: return <<"END";
337: <script type="text/javascript">
338: // <![CDATA[
339: setTimeout(function() {
340: var newurl = '$url';
341: if (document.getElementById('LC_update_$cid')) {
342: document.getElementById('LC_update_$cid').style.display = 'none';
343: }
344: if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
345: window.location.href = "$url";
346: }
347: }, $timeout);
348: // ]]>
349: </script>
350: END
351: }
352:
1.1 www 353: # ================================================================ Main Handler
354:
355: sub handler {
1.2 www 356: my $r=shift;
1.1 www 357:
358: # ------------------------------------------- Set document type for header only
359:
1.2 www 360: if ($r->header_only) {
1.51 albertel 361: &Apache::loncommon::content_type($r,'text/html');
362: $r->send_http_header;
363: return OK;
1.2 www 364: }
365:
1.5 www 366: my %cachehash=();
367: my $multichoice=0;
368: my %multichoicehash=();
1.97 raeburn 369: my %prog_state=();
1.98 raeburn 370: my ($redirecturl,$redirectsymb,$enc,$anchor,$deeplinklevel);
1.4 www 371: my $next='';
1.94 raeburn 372: my $hostname = $r->hostname();
1.4 www 373: my @possibilities=();
1.37 www 374: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53 albertel 375: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
1.88 raeburn 376: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
1.89 raeburn 377: if ($currenturl=~m|^/enc/|) {
378: $currenturl=&Apache::lonenc::unencrypted($currenturl);
379: }
380: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
381: $currenturl=~s/^https?\:\/\///;
382: $currenturl=~s/^[^\/]+//;
383: my ($preupdatepos,$last,$reinitcheck);
384: if ($direction eq 'return') {
385: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
386: &GDBM_READER(),0640)) {
387: $last=$hash{'last_known'};
388: untie(%hash);
389: }
1.91 raeburn 390: } elsif ($direction eq 'firstanswerable') {
391: my $furl = &first_answerable_ressymb();
1.95 raeburn 392: my $usehttp = &check_http_req(\$furl);
1.94 raeburn 393: if (($usehttp) && ($hostname ne '')) {
394: $furl='http://'.$hostname.$furl;
1.93 raeburn 395: } else {
396: $furl=&Apache::lonnet::absolute_url().$furl;
397: }
1.91 raeburn 398: &Apache::loncommon::content_type($r,'text/html');
1.93 raeburn 399: $r->header_out(Location => $furl);
1.91 raeburn 400: return REDIRECT;
401: } elsif ($direction eq 'endplacement') {
402: &Apache::loncommon::content_type($r,'text/html');
403: $r->send_http_header;
404: $r->print(&Apache::lonplacementtest::showresult());
405: return OK;
1.89 raeburn 406: }
1.87 raeburn 407: if ($env{'request.course.id'}) {
408: # Check if course needs to be re-initialized
409: my $loncaparev = $r->dir_config('lonVersion');
1.89 raeburn 410: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
411: if ($reinitcheck eq 'switch') {
1.87 raeburn 412: &Apache::loncommon::content_type($r,'text/html');
413: $r->send_http_header;
414: $r->print(&Apache::loncommon::check_release_result(@reinit));
415: return OK;
1.89 raeburn 416: } elsif ($reinitcheck eq 'update') {
1.87 raeburn 417: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
418: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1.89 raeburn 419: $preupdatepos = &Apache::lonnet::symbread($currenturl);
420: unless ($direction eq 'return') {
421: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
422: &GDBM_READER(),0640)) {
423: $last=$hash{'last_known'};
424: untie(%hash);
425: }
426: }
1.97 raeburn 427: &Apache::loncommon::content_type($r,'text/html');
428: $r->send_http_header;
429: $r->print(&Apache::loncommon::start_page('Content Changed'));
430: my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
431: '<br />'.
432: &mt('Your course session is being updated because of recent changes by course personnel.').
433: ' '.&mt('Please be patient.').'<br /></div>'.
434: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
435: %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
436: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
1.87 raeburn 437: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
1.97 raeburn 438: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished'));
1.87 raeburn 439: if ($ferr) {
1.97 raeburn 440: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1.87 raeburn 441: my $requrl = $r->uri;
442: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
443: $env{'user.reinit'} = 1;
444: return HTTP_NOT_ACCEPTABLE;
1.89 raeburn 445: } else {
446: if ($last) {
447: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
448: unless (&Apache::lonnet::symbverify($last,$fn)) {
449: undef($last);
450: }
451: }
1.87 raeburn 452: }
453: }
454: }
1.54 albertel 455: if ($direction eq 'firstres') {
1.69 www 456: my $furl=&first_accessible_resource();
1.95 raeburn 457: my $usehttp = &check_http_req(\$furl);
1.94 raeburn 458: if (($usehttp) && ($hostname ne '')) {
459: $furl='http://'.$hostname.$furl;
1.93 raeburn 460: } else {
461: $furl=&Apache::lonnet::absolute_url().$furl;
462: }
1.97 raeburn 463: if ($reinitcheck eq 'update') {
464: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
465: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
466: $r->print(&Apache::loncommon::end_page());
467: return OK;
468: } else {
469: &Apache::loncommon::content_type($r,'text/html');
470: $r->header_out(Location => $furl);
471: return REDIRECT;
472: }
1.54 albertel 473: }
1.89 raeburn 474: if ($direction eq 'return') {
1.10 www 475: # -------------------------------------------------------- Return to last known
1.93 raeburn 476: my ($newloc,$usehttp);
1.53 albertel 477: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36 www 478: &GDBM_READER(),0640))) {
1.52 albertel 479: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50 albertel 480: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
481: $newloc=$hash{'src_'.$id};
482: if ($newloc) {
1.95 raeburn 483: $usehttp = &check_http_req(\$newloc);
1.92 raeburn 484: if ($hash{'encrypted_'.$id}) {
485: $newloc=&Apache::lonenc::encrypted($newloc);
486: } elsif ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)\#([^\#]+)$}) {
487: $newloc = $1.&escape('#').$2;
488: }
1.50 albertel 489: } else {
1.57 www 490: $newloc='/adm/navmaps';
1.50 albertel 491: }
1.36 www 492: untie %hash;
1.10 www 493: } else {
1.57 www 494: $newloc='/adm/navmaps';
1.89 raeburn 495: }
1.94 raeburn 496: if (($usehttp) && ($hostname ne '')) {
497: $newloc='http://'.$hostname.$newloc;
1.93 raeburn 498: } else {
499: $newloc=&Apache::lonnet::absolute_url().$newloc
500: }
1.97 raeburn 501: if ($reinitcheck eq 'update') {
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 => $newloc);
508: return REDIRECT;
509: }
1.10 www 510: }
1.35 www 511: #
512: # Is the current URL on the map? If not, start with last known URL
513: #
1.89 raeburn 514:
1.35 www 515: unless (&Apache::lonnet::is_on_map($currenturl)) {
1.89 raeburn 516: if ($preupdatepos) {
517: undef($preupdatepos);
518: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
519: &GDBM_READER(),0640)) {
520: $last=$hash{'last_known'};
1.7 www 521: untie(%hash);
522: }
1.89 raeburn 523: my $newloc;
1.7 www 524: if ($last) {
1.52 albertel 525: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7 www 526: } else {
1.97 raeburn 527: my $newloc = &Apache::lonnet::absolute_url().
528: '/adm/navmaps';
529: if ($reinitcheck eq 'update') {
530: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
531: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
532: $r->print(&Apache::loncommon::end_page());
533: return OK;
534: } else {
535: &Apache::loncommon::content_type($r,'text/html');
536: $r->header_out(Location => $newloc);
537: return REDIRECT;
538: }
1.7 www 539: }
540: }
1.3 www 541: # ------------------------------------------- Do we have any idea where we are?
542: my $position;
1.89 raeburn 543: if ($preupdatepos) {
544: $position = $preupdatepos;
545: } else {
546: $position=Apache::lonnet::symbread($currenturl);
547: }
548: if ($position) {
1.3 www 549: # ------------------------------------------------------------------------- Yes
1.41 www 550: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52 albertel 551: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23 www 552: $cachehash{$startoutmap}{'last_known'}=
1.52 albertel 553: [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20 albertel 554:
1.5 www 555: # ============================================================ Tie the big hash
1.53 albertel 556: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 557: &GDBM_READER(),0640)) {
1.29 www 558: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
559: '.'.$mapnum;
1.14 www 560:
1.15 www 561: # ------------------------------------------------- Move forward, backward, etc
1.22 www 562: my $endupmap;
563: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 564: # -------------------------------------- Do we have one and only one empty URL?
1.22 www 565: # We are now at at least one non-empty URL
1.4 www 566: # ----------------------------------------------------- Check out possibilities
567: if ($next) {
568: @possibilities=split(/\,/,$next);
569: if ($#possibilities==0) {
1.5 www 570: # ---------------------------------------------- Only one possibility, redirect
1.90 raeburn 571: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
1.52 albertel 572: $cachehash{$endupmap}{$redirecturl}=
573: [$redirecturl,(split(/\./,$next))[1]];
1.4 www 574: } else {
1.5 www 575: # ------------------------ There are multiple possibilities for a next resource
576: $multichoice=1;
1.62 albertel 577: foreach my $id (@possibilities) {
578: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
579: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
580: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
581: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
582: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
583: $multichoicehash{'symb_'.$id} =
1.32 bowersj2 584: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
585: $second.'___'.$symbSrc);
586:
1.62 albertel 587: my ($choicemap,$choiceres)=split(/\./,$id);
1.52 albertel 588: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62 albertel 589: my $url=$multichoicehash{'src_'.$id};
1.52 albertel 590: $cachehash{$map}{$url}=[$url,$choiceres];
1.62 albertel 591: }
1.4 www 592: }
1.5 www 593: } else {
594: # -------------------------------------------------------------- No place to go
595: $multichoice=-1;
1.98 raeburn 596: if ($hash{'deeplinkonly_'.$rid}) {
597: (my $value,$deeplinklevel) = split(/:/,$hash{'deeplinkonly_'.$rid});
598: }
1.4 www 599: }
1.5 www 600: # ----------------- The program must come past this point to untie the big hash
1.3 www 601: untie(%hash);
1.5 www 602: # --------------------------------------------------------- Store position info
1.52 albertel 603: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.86 raeburn 604: foreach my $thismap (keys(%cachehash)) {
1.52 albertel 605: my $mapnum=$cachehash{$thismap}->{'mapnum'};
606: delete($cachehash{$thismap}->{'mapnum'});
607: &Apache::lonnet::symblist($thismap,
608: %{$cachehash{$thismap}});
1.19 www 609: }
1.5 www 610: # ============================================== Do not return before this line
1.4 www 611: if ($redirecturl) {
1.5 www 612: # ----------------------------------------------------- There is a URL to go to
1.38 www 613: if ($direction eq 'forward') {
614: &Apache::lonnet::linklog($currenturl,$redirecturl);
615: }
616: if ($direction eq 'back') {
617: &Apache::lonnet::linklog($redirecturl,$currenturl);
618: }
1.85 musolffc 619: # ------------------------------------- Check for and display critical messages
1.96 raeburn 620: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
1.89 raeburn 621: unless ($redirect) {
1.95 raeburn 622: my $usehttp = &check_http_req(\$redirecturl);
1.94 raeburn 623: if (($usehttp) && ($hostname ne '')) {
624: $url='http://'.$hostname.$redirecturl;
1.93 raeburn 625: } else {
626: $url=&Apache::lonnet::absolute_url().$redirecturl;
627: }
1.90 raeburn 628: my $addanchor;
629: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
630: $addanchor = 1;
631: $url =~ s/\#.+$//;
632: }
1.89 raeburn 633: $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.90 raeburn 634: if ($addanchor) {
635: $url .= $anchor;
636: }
1.85 musolffc 637: }
1.97 raeburn 638: if ($reinitcheck eq 'update') {
639: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
640: $r->print(&reinited_js($url,$env{'request.course.id'},100));
641: $r->print(&Apache::loncommon::end_page());
642: return OK;
643: } else {
644: &Apache::loncommon::content_type($r,'text/html');
645: $r->header_out(Location => $url);
646: return REDIRECT;
647: }
1.5 www 648: } else {
649: # --------------------------------------------------------- There was a problem
1.51 albertel 650: &Apache::loncommon::content_type($r,'text/html');
1.8 www 651: $r->send_http_header;
1.59 www 652: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
1.98 raeburn 653: 'deeplink' => 'No link available',
654: 'deeplinkres' =>
655: 'Navigation to other content is unavailable when accessing content via deep-linking',
656: 'deeplinkmap' =>
657: 'You have reached the end of the sequence of available materials for access via deep-linking',
1.59 www 658: 'explain' =>
659: 'You have reached the end of the sequence of materials.',
660: 'back' => 'Go Back',
1.83 raeburn 661: 'nav' => 'Course Contents',
1.59 www 662: 'wherenext' =>
663: 'There are several possibilities of where to go next',
664: 'pick' =>
665: 'Please click on the the resource you intend to access',
666: 'titleheader' => 'Title',
1.89 raeburn 667: 'type' => 'Type',
668: 'update' => 'Content updated',
669: 'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
1.91 raeburn 670: 'gonav' => 'Go to the Contents page to select a resource to display.',
671: );
1.83 raeburn 672: if (&Apache::loncommon::course_type() eq 'Community') {
673: $lt{'nav'} = &mt('Community Contents');
674: }
1.8 www 675: if ($#possibilities>0) {
1.67 albertel 676: my $start_page=
677: &Apache::loncommon::start_page('Multiple Resources');
1.8 www 678: $r->print(<<ENDSTART);
1.67 albertel 679: $start_page
1.59 www 680: <h3>$lt{'wherenext'}</h3>
1.8 www 681: <p>
1.59 www 682: $lt{'pick'}:
1.8 www 683: <p>
1.79 bisitz 684: <table border="2">
1.59 www 685: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8 www 686: ENDSTART
1.62 albertel 687: foreach my $id (@possibilities) {
1.92 raeburn 688: my $src = $multichoicehash{'src_'.$id};
1.95 raeburn 689: my $usehttp = &check_http_req(\$src);
1.94 raeburn 690: if (($usehttp) && ($hostname ne '')) {
691: $src = 'http://'.$hostname.$src;
1.93 raeburn 692: }
1.8 www 693: $r->print(
694: '<tr><td><a href="'.
1.92 raeburn 695: &add_get_param($src,
1.66 albertel 696: {'symb' =>
697: $multichoicehash{'symb_'.$id},
698: }).'">'.
1.62 albertel 699: $multichoicehash{'title_'.$id}.
700: '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8 www 701: '</td></tr>');
1.26 www 702: }
1.59 www 703: $r->print('</table>');
1.8 www 704: } else {
1.89 raeburn 705: if ($reinitcheck) {
706: if (&Apache::loncommon::course_type() eq 'Community') {
707: $r->print(
708: &Apache::loncommon::start_page('Community Contents Updated'));
709: } else {
710: $r->print(
711: &Apache::loncommon::start_page('Course Contents Updated'));
712: }
713: $r->print('<h2>'.$lt{'update'}.'</h2>'
714: .'<p>'.$lt{'expupdate'}.'<br />'
715: .$lt{'gonav'}.'</p>');
716: } else {
1.91 raeburn 717: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
718: (!$env{'request.role.adv'})) {
719: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
720: if ($incomplete) {
721: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
722: } else {
723: $r->print(&Apache::lonplacementtest::showresult(1));
724: }
1.98 raeburn 725: } else {
1.91 raeburn 726: $r->print(
1.98 raeburn 727: &Apache::loncommon::start_page('No Resource'));
728: if ($deeplinklevel eq 'resource') {
729: $r->print('<h2>'.$lt{'deeplink'}.'</h2>'
730: .'<p>'.$lt{'deeplinkres'}.'</p>');
731: } elsif ($deeplinklevel eq 'map') {
732: $r->print('<h2>'.$lt{'title'}.'</h2>'
733: .'<p>'.$lt{'deeplinkmap'}.'</p>');
734: } else {
735: $r->print('<h2>'.$lt{'title'}.'</h2>'
736: .'<p>'.$lt{'explain'}.'</p>');
737: }
1.91 raeburn 738: }
739: }
740: }
741: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
742: ($env{'request.role.adv'})) {
1.98 raeburn 743: if ($deeplinklevel) {
744: $r->print(
745: &Apache::lonhtmlcommon::actionbox(
746: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a>']));
747: } elsif ((!@possibilities) && ($reinitcheck)) {
1.91 raeburn 748: $r->print(
749: &Apache::lonhtmlcommon::actionbox(
750: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
751: ]));
752: } else {
1.89 raeburn 753: $r->print(
1.91 raeburn 754: &Apache::lonhtmlcommon::actionbox(
755: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
756: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
757: ]));
1.89 raeburn 758: }
1.91 raeburn 759:
1.82 bisitz 760: }
1.89 raeburn 761: $r->print(&Apache::loncommon::end_page());
762:
1.59 www 763: return OK;
764: }
1.5 www 765: } else {
766: # ------------------------------------------------- Problem, could not tie hash
1.97 raeburn 767: if ($reinitcheck eq 'update') {
768: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
769: $r->print(&Apache::loncommon::end_page());
770: }
1.53 albertel 771: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5 www 772: return HTTP_NOT_ACCEPTABLE;
1.3 www 773: }
1.5 www 774: } else {
775: # ---------------------------------------- No, could not determine where we are
1.97 raeburn 776: my $newloc = '/adm/ambiguous';
777: if ($reinitcheck eq 'update') {
778: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
779: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
780: $r->print(&Apache::loncommon::end_page());
781: } else {
782: $r->internal_redirect($newloc);
783: }
1.81 raeburn 784: return OK;
1.2 www 785: }
1.5 www 786: } else {
1.2 www 787: # -------------------------- Class was not initialized or page fliped strangely
1.53 albertel 788: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2 www 789: return HTTP_NOT_ACCEPTABLE;
790: }
1.1 www 791: }
792:
793: 1;
794: __END__
795:
1.77 jms 796: =pod
797:
798: =head1 NAME
799:
800: Apache::lonpageflip
801:
802: =head1 SYNOPSIS
803:
804: Deals with forward, backward, and other page flips.
805:
806: This is part of the LearningOnline Network with CAPA project
807: described at http://www.lon-capa.org.
808:
809: =head1 OVERVIEW
810:
811: (empty)
812:
813: =head1 SUBROUTINES
814:
815: =over cleanup()
816:
817: =item addrid()
818:
819: =item fullmove()
820:
821: =item hash_src()
822:
823: =item move()
824:
825: =item get_next_possible_move()
826:
827: =item first_accessible_resource()
828:
829: =item handler()
830:
831: =back
832:
833: =cut
1.1 www 834:
835:
836:
837:
838:
839:
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