Annotation of rat/lonpageflip.pm, revision 1.112
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.112 ! raeburn 5: # $Id: lonpageflip.pm,v 1.111 2021/12/31 19:51:04 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},$anchor);
1.50 albertel 99: }
100:
1.15 www 101: sub move {
1.104 raeburn 102: my ($next,$endupmap,$direction,$firstres) = @_;
1.72 albertel 103: my $safecount=0;
104: my $allowed=0;
1.98 raeburn 105: my $deeplinkonly=0;
1.106 raeburn 106: my $deeplinkchecked;
107: my $deeplink_login_pc;
1.98 raeburn 108: my $prev=$next;
109: my ($prevmapid)=split(/\./,$next);
1.72 albertel 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 {
1.106 raeburn 120: my $nodeeplinkcheck = 0;
121: if ($hash{'is_map_'.$next}) {
122: $nodeeplinkcheck = 1;
123: }
124: my $priv = &Apache::lonnet::allowed('bre',$url,$symb,'','','','',$nodeeplinkcheck);
1.104 raeburn 125: $allowed = (($priv eq 'F') || ($priv eq '2') || ($priv eq 'A'));
1.72 albertel 126: }
1.98 raeburn 127: $deeplinkonly = 0;
128: if ($hash{'deeplinkonly_'.$next}) {
1.110 raeburn 129: my ($value,$level) = map { &unescape($_); } split(/:/,$hash{'deeplinkonly_'.$next});
1.108 raeburn 130: my ($state,$others,$listed,$scope,$protect) = split(/,/,$value);
131: unless (($state eq 'both') || ($hash{'is_map_'.$next})) {
1.106 raeburn 132: if ($level eq 'resource') {
1.98 raeburn 133: $deeplinkonly = 1;
1.106 raeburn 134: } elsif ($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: $deeplinkonly = 1;
159: }
1.98 raeburn 160: }
161: }
1.104 raeburn 162: } elsif (($hash{'deeplinkonly_'.$prev}) && (!$firstres)) {
1.110 raeburn 163: my ($value,$level) = map { &unescape($_); } split(/:/,$hash{'deeplinkonly_'.$prev});
1.108 raeburn 164: my ($state,$others,$listed,$scope,$protect) = split(/,/,$value);
165: unless (($state eq 'both') || ($hash{'is_map_'.$prev})) {
1.106 raeburn 166: if ($level eq 'resource') {
1.98 raeburn 167: $deeplinkonly = 1;
1.106 raeburn 168: } elsif ($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: }
1.98 raeburn 194: }
195: }
196: }
1.72 albertel 197: $safecount++;
198: } while ( ($next)
199: && ($next!~/\,/)
200: && (
201: (!$hash{'src_'.$next})
202: || (
1.98 raeburn 203: (!$env{'request.role.adv'})
204: && (($hash{'randomout_'.$next})
1.106 raeburn 205: || ($deeplinkonly)
1.107 raeburn 206: || ($hash{'deeplinkout_'.$next}))
1.72 albertel 207: )
208: || (!$allowed)
209: )
210: && ($safecount<10000));
211:
212: return ($next,$endupmap);
213: }
214:
215: sub get_next_possible_move {
1.15 www 216: my ($rid,$mapurl,$direction)=@_;
1.23 www 217: my $startoutrid=$rid;
1.15 www 218:
219: my $next='';
220:
221: my $mincond=1;
222: my $posnext='';
223: if ($direction eq 'forward') {
224: # --------------------------------------------------------------------- Forward
1.33 www 225: while ($hash{'type_'.$rid} eq 'finish') {
226: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15 www 227: }
1.61 albertel 228: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.64 albertel 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>=$mincond) {
1.15 www 234: if ($posnext) {
1.61 albertel 235: $posnext.=','.$id.':'.$thiscond;
1.15 www 236: } else {
1.61 albertel 237: $posnext=$id.':'.$thiscond;
1.15 www 238: }
239: if ($thiscond>$mincond) { $mincond=$thiscond; }
240: }
1.106 raeburn 241: }
1.61 albertel 242: foreach my $id (split(/\,/,$posnext)) {
243: my ($linkid,$condval)=split(/\:/,$id);
1.15 www 244: if ($condval>=$mincond) {
245: $next=&addrid($next,$hash{'goesto_'.$linkid},
246: $hash{'condid_'.$hash{'undercond_'.$linkid}});
247: }
1.61 albertel 248: }
1.15 www 249: if ($hash{'is_map_'.$next}) {
1.23 www 250: # This jumps to the beginning of a new map (going down level)
1.15 www 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}};
1.47 raeburn 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(/\./,$next))[0]};
1.15 www 259: }
1.23 www 260: } elsif
261: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
262: # This comes up from a map (coming up one level);
263: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61 albertel 264: }
1.15 www 265: } elsif ($direction eq 'back') {
266: # ------------------------------------------------------------------- Backwards
1.33 www 267: while ($hash{'type_'.$rid} eq 'start') {
268: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
269: }
1.62 albertel 270: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
1.64 albertel 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:$linkcond;
1.62 albertel 275: if ($thiscond>=$mincond) {
276: if ($posnext) {
277: $posnext.=','.$id.':'.$thiscond;
278: } else {
279: $posnext=$id.':'.$thiscond;
280: }
281: if ($thiscond>$mincond) { $mincond=$thiscond; }
282: }
1.106 raeburn 283: }
1.62 albertel 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_'.$linkid}});
289: }
290: }
1.15 www 291: if ($hash{'is_map_'.$next}) {
1.24 www 292: # This jumps to the end of a new map (going down one level)
1.15 www 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}};
1.47 raeburn 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(/\./,$next))[0]};
301: }
1.24 www 302: } elsif
303: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
304: # This comes back up from a map (going up one level);
305: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 306: }
307: }
308: return ($next,$mapurl);
309: }
310:
1.69 www 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'};
1.105 raeburn 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)) {
1.74 albertel 323: my ($name,$value) = split(/=/,$pair);
324: $args{&unescape($name)} = &unescape($value);
325: }
1.104 raeburn 326: my $priv = &Apache::lonnet::allowed('bre',$url,$args{'symb'});
327: my $allowed = (($priv eq 'F') || ($priv eq '2') || ($priv eq 'A'));
328: if (!$allowed) {
1.69 www 329: # Wow, we cannot see this ... move forward to the next one that we can see
1.104 raeburn 330: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward',1);
1.69 www 331: # Build the new URL
1.105 raeburn 332: if ($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: }
1.107 raeburn 341: }
1.106 raeburn 342: }
1.69 www 343: untie(%hash);
344: return $furl;
345: } else {
346: return '/adm/navmaps';
347: }
348: }
349:
1.91 raeburn 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 $result;
368: } else {
369: return &first_accessible_resource();
370: }
371: }
372:
1.95 raeburn 373: sub check_http_req {
1.103 raeburn 374: my ($srcref,$hostname) = @_;
1.92 raeburn 375: return unless (ref($srcref) eq 'SCALAR');
1.93 raeburn 376: my $usehttp;
1.92 raeburn 377: if ($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 (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
381: ($ENV{'SERVER_PORT'} == 443) &&
382: ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
1.103 raeburn 383: unless ((&Apache::lonnet::uses_sts()) ||
384: (&Apache::lonnet::waf_allssl($hostname))) {
1.99 raeburn 385: $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
386: $usehttp = 1;
387: }
1.95 raeburn 388: } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
389: ($ENV{'SERVER_PORT'} == 443)) {
1.103 raeburn 390: unless ((&Apache::lonnet::uses_sts()) ||
391: (&Apache::lonnet::waf_allssl($hostname))) {
1.100 raeburn 392: my ($url,$anchor) = ($$srcref =~ /^([^\#]+)(?:|(\#[^\#]+))$/);
393: $$srcref = $url . (($$srcref =~/\?/)? '&':'?') . 'usehttp=1' .$anchor;
1.99 raeburn 394: $usehttp = 1;
395: }
1.92 raeburn 396: }
397: }
1.93 raeburn 398: return $usehttp;
1.92 raeburn 399: }
400:
1.97 raeburn 401: sub reinited_js {
402: my ($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:
1.106 raeburn 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'};
1.109 raeburn 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]);
1.106 raeburn 435: }
1.109 raeburn 436: $deeplink_login_pc = $hash{'map_pc_'.$loginmap};
1.106 raeburn 437: }
438: }
439: return $deeplink_login_pc;
440: }
441:
1.1 www 442: # ================================================================ Main Handler
443:
444: sub handler {
1.2 www 445: my $r=shift;
1.1 www 446:
447: # ------------------------------------------- Set document type for header only
448:
1.2 www 449: if ($r->header_only) {
1.51 albertel 450: &Apache::loncommon::content_type($r,'text/html');
451: $r->send_http_header;
452: return OK;
1.2 www 453: }
454:
1.5 www 455: my %cachehash=();
456: my $multichoice=0;
457: my %multichoicehash=();
1.97 raeburn 458: my %prog_state=();
1.98 raeburn 459: my ($redirecturl,$redirectsymb,$enc,$anchor,$deeplinklevel);
1.4 www 460: my $next='';
1.94 raeburn 461: my $hostname = $r->hostname();
1.4 www 462: my @possibilities=();
1.37 www 463: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53 albertel 464: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
1.88 raeburn 465: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
1.89 raeburn 466: if ($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: }
1.91 raeburn 479: } elsif ($direction eq 'firstanswerable') {
480: my $furl = &first_answerable_ressymb();
1.103 raeburn 481: my $usehttp = &check_http_req(\$furl,$hostname);
1.94 raeburn 482: if (($usehttp) && ($hostname ne '')) {
483: $furl='http://'.$hostname.$furl;
1.93 raeburn 484: } else {
485: $furl=&Apache::lonnet::absolute_url().$furl;
486: }
1.91 raeburn 487: &Apache::loncommon::content_type($r,'text/html');
1.93 raeburn 488: $r->header_out(Location => $furl);
1.91 raeburn 489: return REDIRECT;
490: } elsif ($direction eq 'endplacement') {
491: &Apache::loncommon::content_type($r,'text/html');
492: $r->send_http_header;
493: $r->print(&Apache::lonplacementtest::showresult());
494: return OK;
1.89 raeburn 495: }
1.87 raeburn 496: if ($env{'request.course.id'}) {
497: # Check if course needs to be re-initialized
498: my $loncaparev = $r->dir_config('lonVersion');
1.89 raeburn 499: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
500: if ($reinitcheck eq 'switch') {
1.87 raeburn 501: &Apache::loncommon::content_type($r,'text/html');
502: $r->send_http_header;
503: $r->print(&Apache::loncommon::check_release_result(@reinit));
504: return OK;
1.112 ! raeburn 505: }
! 506: my ($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')) {
1.89 raeburn 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: }
1.97 raeburn 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.').
1.102 raeburn 526: ' '.&mt('Please be patient').'.<br /></div>'.
1.97 raeburn 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($r,\%prog_state,&mt('Updating course'));
1.87 raeburn 530: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
1.102 raeburn 531: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished!'));
1.87 raeburn 532: if ($ferr) {
1.97 raeburn 533: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1.87 raeburn 534: my $requrl = $r->uri;
535: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
536: $env{'user.reinit'} = 1;
537: return HTTP_NOT_ACCEPTABLE;
1.89 raeburn 538: } else {
539: if ($last) {
540: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
541: unless (&Apache::lonnet::symbverify($last,$fn)) {
542: undef($last);
543: }
544: }
1.87 raeburn 545: }
546: }
1.112 ! raeburn 547: if (($reinitcheck eq 'both') || ($reinitcheck eq 'supp')) {
! 548: my ($supplemental,$refs_updated) = &Apache::lonnet::get_supplemental($cnum,$cdom);
! 549: unless ($refs_updated) {
! 550: &Apache::loncommon::set_supp_httprefs($cnum,$cdom,$supplemental);
! 551: }
! 552: }
1.87 raeburn 553: }
1.54 albertel 554: if ($direction eq 'firstres') {
1.69 www 555: my $furl=&first_accessible_resource();
1.103 raeburn 556: my $usehttp = &check_http_req(\$furl,$hostname);
1.94 raeburn 557: if (($usehttp) && ($hostname ne '')) {
558: $furl='http://'.$hostname.$furl;
1.93 raeburn 559: } else {
560: $furl=&Apache::lonnet::absolute_url().$furl;
561: }
1.97 raeburn 562: if ($reinitcheck eq 'update') {
563: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
564: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
565: $r->print(&Apache::loncommon::end_page());
566: return OK;
567: } else {
568: &Apache::loncommon::content_type($r,'text/html');
569: $r->header_out(Location => $furl);
570: return REDIRECT;
571: }
1.54 albertel 572: }
1.101 raeburn 573: if ($direction eq 'return') {
1.10 www 574: # -------------------------------------------------------- Return to last known
1.93 raeburn 575: my ($newloc,$usehttp);
1.53 albertel 576: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36 www 577: &GDBM_READER(),0640))) {
1.52 albertel 578: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50 albertel 579: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
580: $newloc=$hash{'src_'.$id};
581: if ($newloc) {
1.103 raeburn 582: $usehttp = &check_http_req(\$newloc,$hostname);
1.92 raeburn 583: if ($hash{'encrypted_'.$id}) {
584: $newloc=&Apache::lonenc::encrypted($newloc);
1.101 raeburn 585: }
586: if ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)(?:|(\#[^\#]+))$}) {
1.100 raeburn 587: my ($url,$anchor) = ($1,$2);
588: if ($anchor) {
1.101 raeburn 589: $newloc = $url.(($url=~/\?/)?'&':'?').'symb='.&escape($last).$anchor;
1.100 raeburn 590: }
1.92 raeburn 591: }
1.50 albertel 592: } else {
1.57 www 593: $newloc='/adm/navmaps';
1.50 albertel 594: }
1.36 www 595: untie %hash;
1.10 www 596: } else {
1.57 www 597: $newloc='/adm/navmaps';
1.89 raeburn 598: }
1.94 raeburn 599: if (($usehttp) && ($hostname ne '')) {
600: $newloc='http://'.$hostname.$newloc;
1.93 raeburn 601: } else {
602: $newloc=&Apache::lonnet::absolute_url().$newloc
603: }
1.97 raeburn 604: if ($reinitcheck eq 'update') {
605: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
606: $r->print(&Apache::loncommon::end_page());
607: return OK;
608: } else {
609: &Apache::loncommon::content_type($r,'text/html');
610: $r->header_out(Location => $newloc);
611: return REDIRECT;
612: }
1.10 www 613: }
1.35 www 614: #
615: # Is the current URL on the map? If not, start with last known URL
616: #
1.89 raeburn 617:
1.35 www 618: unless (&Apache::lonnet::is_on_map($currenturl)) {
1.89 raeburn 619: if ($preupdatepos) {
620: undef($preupdatepos);
621: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
622: &GDBM_READER(),0640)) {
623: $last=$hash{'last_known'};
1.7 www 624: untie(%hash);
625: }
626: if ($last) {
1.52 albertel 627: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7 www 628: } else {
1.97 raeburn 629: my $newloc = &Apache::lonnet::absolute_url().
630: '/adm/navmaps';
631: if ($reinitcheck eq 'update') {
632: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
633: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
634: $r->print(&Apache::loncommon::end_page());
635: return OK;
636: } else {
637: &Apache::loncommon::content_type($r,'text/html');
638: $r->header_out(Location => $newloc);
639: return REDIRECT;
640: }
1.7 www 641: }
642: }
1.3 www 643: # ------------------------------------------- Do we have any idea where we are?
644: my $position;
1.89 raeburn 645: if ($preupdatepos) {
646: $position = $preupdatepos;
647: } else {
648: $position=Apache::lonnet::symbread($currenturl);
649: }
650: if ($position) {
1.3 www 651: # ------------------------------------------------------------------------- Yes
1.41 www 652: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52 albertel 653: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23 www 654: $cachehash{$startoutmap}{'last_known'}=
1.52 albertel 655: [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20 albertel 656:
1.5 www 657: # ============================================================ Tie the big hash
1.53 albertel 658: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 659: &GDBM_READER(),0640)) {
1.29 www 660: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
661: '.'.$mapnum;
1.14 www 662:
1.15 www 663: # ------------------------------------------------- Move forward, backward, etc
1.22 www 664: my $endupmap;
665: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 666: # -------------------------------------- Do we have one and only one empty URL?
1.22 www 667: # We are now at at least one non-empty URL
1.4 www 668: # ----------------------------------------------------- Check out possibilities
669: if ($next) {
670: @possibilities=split(/\,/,$next);
671: if ($#possibilities==0) {
1.5 www 672: # ---------------------------------------------- Only one possibility, redirect
1.90 raeburn 673: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
1.52 albertel 674: $cachehash{$endupmap}{$redirecturl}=
675: [$redirecturl,(split(/\./,$next))[1]];
1.4 www 676: } else {
1.5 www 677: # ------------------------ There are multiple possibilities for a next resource
678: $multichoice=1;
1.62 albertel 679: foreach my $id (@possibilities) {
680: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
681: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
682: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
683: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
684: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
685: $multichoicehash{'symb_'.$id} =
1.32 bowersj2 686: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
687: $second.'___'.$symbSrc);
688:
1.62 albertel 689: my ($choicemap,$choiceres)=split(/\./,$id);
1.52 albertel 690: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62 albertel 691: my $url=$multichoicehash{'src_'.$id};
1.52 albertel 692: $cachehash{$map}{$url}=[$url,$choiceres];
1.62 albertel 693: }
1.4 www 694: }
1.5 www 695: } else {
696: # -------------------------------------------------------------- No place to go
697: $multichoice=-1;
1.106 raeburn 698: if ($position && $env{'request.deeplink.login'}) {
699: my ($map,$resid,$url) = &Apache::lonnet::decode_symb($position);
700: my $mapid = $hash{'map_pc_'.&Apache::lonnet::clutter($map)};
701: my $position_deeplink = $hash{'deeplinkonly_'.$mapid.'.'.$resid};
702: if ($position_deeplink) {
1.110 raeburn 703: (my $value,$deeplinklevel) = map { &unescape($_); }
704: split(/:/,$position_deeplink);
1.106 raeburn 705: }
1.98 raeburn 706: }
1.4 www 707: }
1.5 www 708: # ----------------- The program must come past this point to untie the big hash
1.3 www 709: untie(%hash);
1.5 www 710: # --------------------------------------------------------- Store position info
1.52 albertel 711: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.86 raeburn 712: foreach my $thismap (keys(%cachehash)) {
1.52 albertel 713: my $mapnum=$cachehash{$thismap}->{'mapnum'};
714: delete($cachehash{$thismap}->{'mapnum'});
715: &Apache::lonnet::symblist($thismap,
716: %{$cachehash{$thismap}});
1.19 www 717: }
1.5 www 718: # ============================================== Do not return before this line
1.4 www 719: if ($redirecturl) {
1.5 www 720: # ----------------------------------------------------- There is a URL to go to
1.38 www 721: if ($direction eq 'forward') {
722: &Apache::lonnet::linklog($currenturl,$redirecturl);
723: }
724: if ($direction eq 'back') {
725: &Apache::lonnet::linklog($redirecturl,$currenturl);
726: }
1.85 musolffc 727: # ------------------------------------- Check for and display critical messages
1.96 raeburn 728: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
1.89 raeburn 729: unless ($redirect) {
1.103 raeburn 730: my $usehttp = &check_http_req(\$redirecturl,$hostname);
1.94 raeburn 731: if (($usehttp) && ($hostname ne '')) {
732: $url='http://'.$hostname.$redirecturl;
1.93 raeburn 733: } else {
734: $url=&Apache::lonnet::absolute_url().$redirecturl;
735: }
1.90 raeburn 736: my $addanchor;
737: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
738: $addanchor = 1;
739: $url =~ s/\#.+$//;
740: }
1.89 raeburn 741: $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.90 raeburn 742: if ($addanchor) {
743: $url .= $anchor;
744: }
1.85 musolffc 745: }
1.97 raeburn 746: if ($reinitcheck eq 'update') {
747: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
748: $r->print(&reinited_js($url,$env{'request.course.id'},100));
749: $r->print(&Apache::loncommon::end_page());
750: return OK;
751: } else {
752: &Apache::loncommon::content_type($r,'text/html');
753: $r->header_out(Location => $url);
754: return REDIRECT;
755: }
1.5 www 756: } else {
757: # --------------------------------------------------------- There was a problem
1.51 albertel 758: &Apache::loncommon::content_type($r,'text/html');
1.8 www 759: $r->send_http_header;
1.59 www 760: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
1.98 raeburn 761: 'deeplink' => 'No link available',
762: 'deeplinkres' =>
763: 'Navigation to other content is unavailable when accessing content via deep-linking',
764: 'deeplinkmap' =>
765: 'You have reached the end of the sequence of available materials for access via deep-linking',
1.59 www 766: 'explain' =>
767: 'You have reached the end of the sequence of materials.',
768: 'back' => 'Go Back',
1.83 raeburn 769: 'nav' => 'Course Contents',
1.59 www 770: 'wherenext' =>
771: 'There are several possibilities of where to go next',
772: 'pick' =>
773: 'Please click on the the resource you intend to access',
774: 'titleheader' => 'Title',
1.89 raeburn 775: 'type' => 'Type',
776: 'update' => 'Content updated',
777: '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 778: 'gonav' => 'Go to the Contents page to select a resource to display.',
779: );
1.83 raeburn 780: if (&Apache::loncommon::course_type() eq 'Community') {
781: $lt{'nav'} = &mt('Community Contents');
782: }
1.8 www 783: if ($#possibilities>0) {
1.67 albertel 784: my $start_page=
785: &Apache::loncommon::start_page('Multiple Resources');
1.8 www 786: $r->print(<<ENDSTART);
1.67 albertel 787: $start_page
1.59 www 788: <h3>$lt{'wherenext'}</h3>
1.8 www 789: <p>
1.59 www 790: $lt{'pick'}:
1.8 www 791: <p>
1.79 bisitz 792: <table border="2">
1.59 www 793: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8 www 794: ENDSTART
1.62 albertel 795: foreach my $id (@possibilities) {
1.92 raeburn 796: my $src = $multichoicehash{'src_'.$id};
1.103 raeburn 797: my $usehttp = &check_http_req(\$src,$hostname);
1.94 raeburn 798: if (($usehttp) && ($hostname ne '')) {
799: $src = 'http://'.$hostname.$src;
1.93 raeburn 800: }
1.8 www 801: $r->print(
802: '<tr><td><a href="'.
1.92 raeburn 803: &add_get_param($src,
1.66 albertel 804: {'symb' =>
805: $multichoicehash{'symb_'.$id},
806: }).'">'.
1.62 albertel 807: $multichoicehash{'title_'.$id}.
808: '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8 www 809: '</td></tr>');
1.26 www 810: }
1.59 www 811: $r->print('</table>');
1.8 www 812: } else {
1.89 raeburn 813: if ($reinitcheck) {
814: if (&Apache::loncommon::course_type() eq 'Community') {
815: $r->print(
816: &Apache::loncommon::start_page('Community Contents Updated'));
817: } else {
818: $r->print(
819: &Apache::loncommon::start_page('Course Contents Updated'));
820: }
821: $r->print('<h2>'.$lt{'update'}.'</h2>'
822: .'<p>'.$lt{'expupdate'}.'<br />'
823: .$lt{'gonav'}.'</p>');
824: } else {
1.91 raeburn 825: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
826: (!$env{'request.role.adv'})) {
827: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
828: if ($incomplete) {
829: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
830: } else {
831: $r->print(&Apache::lonplacementtest::showresult(1));
832: }
1.98 raeburn 833: } else {
1.91 raeburn 834: $r->print(
1.98 raeburn 835: &Apache::loncommon::start_page('No Resource'));
836: if ($deeplinklevel eq 'resource') {
837: $r->print('<h2>'.$lt{'deeplink'}.'</h2>'
838: .'<p>'.$lt{'deeplinkres'}.'</p>');
839: } elsif ($deeplinklevel eq 'map') {
840: $r->print('<h2>'.$lt{'title'}.'</h2>'
841: .'<p>'.$lt{'deeplinkmap'}.'</p>');
842: } else {
843: $r->print('<h2>'.$lt{'title'}.'</h2>'
844: .'<p>'.$lt{'explain'}.'</p>');
845: }
1.91 raeburn 846: }
847: }
848: }
1.111 raeburn 849: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
850: (!$env{'request.role.adv'})) {
1.98 raeburn 851: if ($deeplinklevel) {
852: $r->print(
853: &Apache::lonhtmlcommon::actionbox(
854: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a>']));
855: } elsif ((!@possibilities) && ($reinitcheck)) {
1.91 raeburn 856: $r->print(
857: &Apache::lonhtmlcommon::actionbox(
858: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
859: ]));
860: } else {
1.89 raeburn 861: $r->print(
1.91 raeburn 862: &Apache::lonhtmlcommon::actionbox(
863: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
864: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
865: ]));
1.89 raeburn 866: }
1.91 raeburn 867:
1.82 bisitz 868: }
1.89 raeburn 869: $r->print(&Apache::loncommon::end_page());
870:
1.59 www 871: return OK;
872: }
1.5 www 873: } else {
874: # ------------------------------------------------- Problem, could not tie hash
1.97 raeburn 875: if ($reinitcheck eq 'update') {
876: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
877: $r->print(&Apache::loncommon::end_page());
878: }
1.53 albertel 879: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5 www 880: return HTTP_NOT_ACCEPTABLE;
1.3 www 881: }
1.5 www 882: } else {
883: # ---------------------------------------- No, could not determine where we are
1.97 raeburn 884: my $newloc = '/adm/ambiguous';
885: if ($reinitcheck eq 'update') {
886: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
887: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
888: $r->print(&Apache::loncommon::end_page());
889: } else {
890: $r->internal_redirect($newloc);
891: }
1.81 raeburn 892: return OK;
1.2 www 893: }
1.5 www 894: } else {
1.2 www 895: # -------------------------- Class was not initialized or page fliped strangely
1.53 albertel 896: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2 www 897: return HTTP_NOT_ACCEPTABLE;
898: }
1.1 www 899: }
900:
901: 1;
902: __END__
903:
1.77 jms 904: =pod
905:
906: =head1 NAME
907:
908: Apache::lonpageflip
909:
910: =head1 SYNOPSIS
911:
912: Deals with forward, backward, and other page flips.
913:
914: This is part of the LearningOnline Network with CAPA project
915: described at http://www.lon-capa.org.
916:
917: =head1 OVERVIEW
918:
919: (empty)
920:
921: =head1 SUBROUTINES
922:
923: =over cleanup()
924:
925: =item addrid()
926:
927: =item fullmove()
928:
929: =item hash_src()
930:
931: =item move()
932:
933: =item get_next_possible_move()
934:
935: =item first_accessible_resource()
936:
937: =item handler()
938:
939: =back
940:
941: =cut
1.1 www 942:
943:
944:
945:
946:
947:
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