Annotation of rat/lonpageflip.pm, revision 1.109
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.109 ! raeburn 5: # $Id: lonpageflip.pm,v 1.108 2021/08/06 01:27:04 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_'.$next}) {
129: my ($value,$level) = split(/:/,$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)) {
1.98 raeburn 163: my ($value,$level) = 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: $r->print(&Apache::loncommon::check_release_result(@reinit));
504: return OK;
1.89 raeburn 505: } elsif ($reinitcheck eq 'update') {
1.87 raeburn 506: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
507: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1.89 raeburn 508: $preupdatepos = &Apache::lonnet::symbread($currenturl);
509: unless ($direction eq 'return') {
510: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
511: &GDBM_READER(),0640)) {
512: $last=$hash{'last_known'};
513: untie(%hash);
514: }
515: }
1.97 raeburn 516: &Apache::loncommon::content_type($r,'text/html');
517: $r->send_http_header;
518: $r->print(&Apache::loncommon::start_page('Content Changed'));
519: my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
520: '<br />'.
521: &mt('Your course session is being updated because of recent changes by course personnel.').
1.102 raeburn 522: ' '.&mt('Please be patient').'.<br /></div>'.
1.97 raeburn 523: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
524: %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
525: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
1.87 raeburn 526: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
1.102 raeburn 527: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished!'));
1.87 raeburn 528: if ($ferr) {
1.97 raeburn 529: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1.87 raeburn 530: my $requrl = $r->uri;
531: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
532: $env{'user.reinit'} = 1;
533: return HTTP_NOT_ACCEPTABLE;
1.89 raeburn 534: } else {
535: if ($last) {
536: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
537: unless (&Apache::lonnet::symbverify($last,$fn)) {
538: undef($last);
539: }
540: }
1.87 raeburn 541: }
542: }
543: }
1.54 albertel 544: if ($direction eq 'firstres') {
1.69 www 545: my $furl=&first_accessible_resource();
1.103 raeburn 546: my $usehttp = &check_http_req(\$furl,$hostname);
1.94 raeburn 547: if (($usehttp) && ($hostname ne '')) {
548: $furl='http://'.$hostname.$furl;
1.93 raeburn 549: } else {
550: $furl=&Apache::lonnet::absolute_url().$furl;
551: }
1.97 raeburn 552: if ($reinitcheck eq 'update') {
553: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
554: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
555: $r->print(&Apache::loncommon::end_page());
556: return OK;
557: } else {
558: &Apache::loncommon::content_type($r,'text/html');
559: $r->header_out(Location => $furl);
560: return REDIRECT;
561: }
1.54 albertel 562: }
1.101 raeburn 563: if ($direction eq 'return') {
1.10 www 564: # -------------------------------------------------------- Return to last known
1.93 raeburn 565: my ($newloc,$usehttp);
1.53 albertel 566: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36 www 567: &GDBM_READER(),0640))) {
1.52 albertel 568: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50 albertel 569: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
570: $newloc=$hash{'src_'.$id};
571: if ($newloc) {
1.103 raeburn 572: $usehttp = &check_http_req(\$newloc,$hostname);
1.92 raeburn 573: if ($hash{'encrypted_'.$id}) {
574: $newloc=&Apache::lonenc::encrypted($newloc);
1.101 raeburn 575: }
576: if ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)(?:|(\#[^\#]+))$}) {
1.100 raeburn 577: my ($url,$anchor) = ($1,$2);
578: if ($anchor) {
1.101 raeburn 579: $newloc = $url.(($url=~/\?/)?'&':'?').'symb='.&escape($last).$anchor;
1.100 raeburn 580: }
1.92 raeburn 581: }
1.50 albertel 582: } else {
1.57 www 583: $newloc='/adm/navmaps';
1.50 albertel 584: }
1.36 www 585: untie %hash;
1.10 www 586: } else {
1.57 www 587: $newloc='/adm/navmaps';
1.89 raeburn 588: }
1.94 raeburn 589: if (($usehttp) && ($hostname ne '')) {
590: $newloc='http://'.$hostname.$newloc;
1.93 raeburn 591: } else {
592: $newloc=&Apache::lonnet::absolute_url().$newloc
593: }
1.97 raeburn 594: if ($reinitcheck eq 'update') {
595: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
596: $r->print(&Apache::loncommon::end_page());
597: return OK;
598: } else {
599: &Apache::loncommon::content_type($r,'text/html');
600: $r->header_out(Location => $newloc);
601: return REDIRECT;
602: }
1.10 www 603: }
1.35 www 604: #
605: # Is the current URL on the map? If not, start with last known URL
606: #
1.89 raeburn 607:
1.35 www 608: unless (&Apache::lonnet::is_on_map($currenturl)) {
1.89 raeburn 609: if ($preupdatepos) {
610: undef($preupdatepos);
611: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
612: &GDBM_READER(),0640)) {
613: $last=$hash{'last_known'};
1.7 www 614: untie(%hash);
615: }
616: if ($last) {
1.52 albertel 617: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7 www 618: } else {
1.97 raeburn 619: my $newloc = &Apache::lonnet::absolute_url().
620: '/adm/navmaps';
621: if ($reinitcheck eq 'update') {
622: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
623: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
624: $r->print(&Apache::loncommon::end_page());
625: return OK;
626: } else {
627: &Apache::loncommon::content_type($r,'text/html');
628: $r->header_out(Location => $newloc);
629: return REDIRECT;
630: }
1.7 www 631: }
632: }
1.3 www 633: # ------------------------------------------- Do we have any idea where we are?
634: my $position;
1.89 raeburn 635: if ($preupdatepos) {
636: $position = $preupdatepos;
637: } else {
638: $position=Apache::lonnet::symbread($currenturl);
639: }
640: if ($position) {
1.3 www 641: # ------------------------------------------------------------------------- Yes
1.41 www 642: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52 albertel 643: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23 www 644: $cachehash{$startoutmap}{'last_known'}=
1.52 albertel 645: [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20 albertel 646:
1.5 www 647: # ============================================================ Tie the big hash
1.53 albertel 648: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 649: &GDBM_READER(),0640)) {
1.29 www 650: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
651: '.'.$mapnum;
1.14 www 652:
1.15 www 653: # ------------------------------------------------- Move forward, backward, etc
1.22 www 654: my $endupmap;
655: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 656: # -------------------------------------- Do we have one and only one empty URL?
1.22 www 657: # We are now at at least one non-empty URL
1.4 www 658: # ----------------------------------------------------- Check out possibilities
659: if ($next) {
660: @possibilities=split(/\,/,$next);
661: if ($#possibilities==0) {
1.5 www 662: # ---------------------------------------------- Only one possibility, redirect
1.90 raeburn 663: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
1.52 albertel 664: $cachehash{$endupmap}{$redirecturl}=
665: [$redirecturl,(split(/\./,$next))[1]];
1.4 www 666: } else {
1.5 www 667: # ------------------------ There are multiple possibilities for a next resource
668: $multichoice=1;
1.62 albertel 669: foreach my $id (@possibilities) {
670: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
671: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
672: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
673: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
674: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
675: $multichoicehash{'symb_'.$id} =
1.32 bowersj2 676: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
677: $second.'___'.$symbSrc);
678:
1.62 albertel 679: my ($choicemap,$choiceres)=split(/\./,$id);
1.52 albertel 680: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62 albertel 681: my $url=$multichoicehash{'src_'.$id};
1.52 albertel 682: $cachehash{$map}{$url}=[$url,$choiceres];
1.62 albertel 683: }
1.4 www 684: }
1.5 www 685: } else {
686: # -------------------------------------------------------------- No place to go
687: $multichoice=-1;
1.106 raeburn 688: if ($position && $env{'request.deeplink.login'}) {
689: my ($map,$resid,$url) = &Apache::lonnet::decode_symb($position);
690: my $mapid = $hash{'map_pc_'.&Apache::lonnet::clutter($map)};
691: my $position_deeplink = $hash{'deeplinkonly_'.$mapid.'.'.$resid};
692: if ($position_deeplink) {
693: (my $value,$deeplinklevel) = split(/:/,$position_deeplink);
694: }
1.98 raeburn 695: }
1.4 www 696: }
1.5 www 697: # ----------------- The program must come past this point to untie the big hash
1.3 www 698: untie(%hash);
1.5 www 699: # --------------------------------------------------------- Store position info
1.52 albertel 700: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.86 raeburn 701: foreach my $thismap (keys(%cachehash)) {
1.52 albertel 702: my $mapnum=$cachehash{$thismap}->{'mapnum'};
703: delete($cachehash{$thismap}->{'mapnum'});
704: &Apache::lonnet::symblist($thismap,
705: %{$cachehash{$thismap}});
1.19 www 706: }
1.5 www 707: # ============================================== Do not return before this line
1.4 www 708: if ($redirecturl) {
1.5 www 709: # ----------------------------------------------------- There is a URL to go to
1.38 www 710: if ($direction eq 'forward') {
711: &Apache::lonnet::linklog($currenturl,$redirecturl);
712: }
713: if ($direction eq 'back') {
714: &Apache::lonnet::linklog($redirecturl,$currenturl);
715: }
1.85 musolffc 716: # ------------------------------------- Check for and display critical messages
1.96 raeburn 717: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
1.89 raeburn 718: unless ($redirect) {
1.103 raeburn 719: my $usehttp = &check_http_req(\$redirecturl,$hostname);
1.94 raeburn 720: if (($usehttp) && ($hostname ne '')) {
721: $url='http://'.$hostname.$redirecturl;
1.93 raeburn 722: } else {
723: $url=&Apache::lonnet::absolute_url().$redirecturl;
724: }
1.90 raeburn 725: my $addanchor;
726: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
727: $addanchor = 1;
728: $url =~ s/\#.+$//;
729: }
1.89 raeburn 730: $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.90 raeburn 731: if ($addanchor) {
732: $url .= $anchor;
733: }
1.85 musolffc 734: }
1.97 raeburn 735: if ($reinitcheck eq 'update') {
736: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
737: $r->print(&reinited_js($url,$env{'request.course.id'},100));
738: $r->print(&Apache::loncommon::end_page());
739: return OK;
740: } else {
741: &Apache::loncommon::content_type($r,'text/html');
742: $r->header_out(Location => $url);
743: return REDIRECT;
744: }
1.5 www 745: } else {
746: # --------------------------------------------------------- There was a problem
1.51 albertel 747: &Apache::loncommon::content_type($r,'text/html');
1.8 www 748: $r->send_http_header;
1.59 www 749: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
1.98 raeburn 750: 'deeplink' => 'No link available',
751: 'deeplinkres' =>
752: 'Navigation to other content is unavailable when accessing content via deep-linking',
753: 'deeplinkmap' =>
754: 'You have reached the end of the sequence of available materials for access via deep-linking',
1.59 www 755: 'explain' =>
756: 'You have reached the end of the sequence of materials.',
757: 'back' => 'Go Back',
1.83 raeburn 758: 'nav' => 'Course Contents',
1.59 www 759: 'wherenext' =>
760: 'There are several possibilities of where to go next',
761: 'pick' =>
762: 'Please click on the the resource you intend to access',
763: 'titleheader' => 'Title',
1.89 raeburn 764: 'type' => 'Type',
765: 'update' => 'Content updated',
766: '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 767: 'gonav' => 'Go to the Contents page to select a resource to display.',
768: );
1.83 raeburn 769: if (&Apache::loncommon::course_type() eq 'Community') {
770: $lt{'nav'} = &mt('Community Contents');
771: }
1.8 www 772: if ($#possibilities>0) {
1.67 albertel 773: my $start_page=
774: &Apache::loncommon::start_page('Multiple Resources');
1.8 www 775: $r->print(<<ENDSTART);
1.67 albertel 776: $start_page
1.59 www 777: <h3>$lt{'wherenext'}</h3>
1.8 www 778: <p>
1.59 www 779: $lt{'pick'}:
1.8 www 780: <p>
1.79 bisitz 781: <table border="2">
1.59 www 782: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8 www 783: ENDSTART
1.62 albertel 784: foreach my $id (@possibilities) {
1.92 raeburn 785: my $src = $multichoicehash{'src_'.$id};
1.103 raeburn 786: my $usehttp = &check_http_req(\$src,$hostname);
1.94 raeburn 787: if (($usehttp) && ($hostname ne '')) {
788: $src = 'http://'.$hostname.$src;
1.93 raeburn 789: }
1.8 www 790: $r->print(
791: '<tr><td><a href="'.
1.92 raeburn 792: &add_get_param($src,
1.66 albertel 793: {'symb' =>
794: $multichoicehash{'symb_'.$id},
795: }).'">'.
1.62 albertel 796: $multichoicehash{'title_'.$id}.
797: '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8 www 798: '</td></tr>');
1.26 www 799: }
1.59 www 800: $r->print('</table>');
1.8 www 801: } else {
1.89 raeburn 802: if ($reinitcheck) {
803: if (&Apache::loncommon::course_type() eq 'Community') {
804: $r->print(
805: &Apache::loncommon::start_page('Community Contents Updated'));
806: } else {
807: $r->print(
808: &Apache::loncommon::start_page('Course Contents Updated'));
809: }
810: $r->print('<h2>'.$lt{'update'}.'</h2>'
811: .'<p>'.$lt{'expupdate'}.'<br />'
812: .$lt{'gonav'}.'</p>');
813: } else {
1.91 raeburn 814: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
815: (!$env{'request.role.adv'})) {
816: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
817: if ($incomplete) {
818: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
819: } else {
820: $r->print(&Apache::lonplacementtest::showresult(1));
821: }
1.98 raeburn 822: } else {
1.91 raeburn 823: $r->print(
1.98 raeburn 824: &Apache::loncommon::start_page('No Resource'));
825: if ($deeplinklevel eq 'resource') {
826: $r->print('<h2>'.$lt{'deeplink'}.'</h2>'
827: .'<p>'.$lt{'deeplinkres'}.'</p>');
828: } elsif ($deeplinklevel eq 'map') {
829: $r->print('<h2>'.$lt{'title'}.'</h2>'
830: .'<p>'.$lt{'deeplinkmap'}.'</p>');
831: } else {
832: $r->print('<h2>'.$lt{'title'}.'</h2>'
833: .'<p>'.$lt{'explain'}.'</p>');
834: }
1.91 raeburn 835: }
836: }
837: }
838: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
839: ($env{'request.role.adv'})) {
1.98 raeburn 840: if ($deeplinklevel) {
841: $r->print(
842: &Apache::lonhtmlcommon::actionbox(
843: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a>']));
844: } elsif ((!@possibilities) && ($reinitcheck)) {
1.91 raeburn 845: $r->print(
846: &Apache::lonhtmlcommon::actionbox(
847: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
848: ]));
849: } else {
1.89 raeburn 850: $r->print(
1.91 raeburn 851: &Apache::lonhtmlcommon::actionbox(
852: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
853: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
854: ]));
1.89 raeburn 855: }
1.91 raeburn 856:
1.82 bisitz 857: }
1.89 raeburn 858: $r->print(&Apache::loncommon::end_page());
859:
1.59 www 860: return OK;
861: }
1.5 www 862: } else {
863: # ------------------------------------------------- Problem, could not tie hash
1.97 raeburn 864: if ($reinitcheck eq 'update') {
865: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
866: $r->print(&Apache::loncommon::end_page());
867: }
1.53 albertel 868: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5 www 869: return HTTP_NOT_ACCEPTABLE;
1.3 www 870: }
1.5 www 871: } else {
872: # ---------------------------------------- No, could not determine where we are
1.97 raeburn 873: my $newloc = '/adm/ambiguous';
874: if ($reinitcheck eq 'update') {
875: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
876: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
877: $r->print(&Apache::loncommon::end_page());
878: } else {
879: $r->internal_redirect($newloc);
880: }
1.81 raeburn 881: return OK;
1.2 www 882: }
1.5 www 883: } else {
1.2 www 884: # -------------------------- Class was not initialized or page fliped strangely
1.53 albertel 885: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2 www 886: return HTTP_NOT_ACCEPTABLE;
887: }
1.1 www 888: }
889:
890: 1;
891: __END__
892:
1.77 jms 893: =pod
894:
895: =head1 NAME
896:
897: Apache::lonpageflip
898:
899: =head1 SYNOPSIS
900:
901: Deals with forward, backward, and other page flips.
902:
903: This is part of the LearningOnline Network with CAPA project
904: described at http://www.lon-capa.org.
905:
906: =head1 OVERVIEW
907:
908: (empty)
909:
910: =head1 SUBROUTINES
911:
912: =over cleanup()
913:
914: =item addrid()
915:
916: =item fullmove()
917:
918: =item hash_src()
919:
920: =item move()
921:
922: =item get_next_possible_move()
923:
924: =item first_accessible_resource()
925:
926: =item handler()
927:
928: =back
929:
930: =cut
1.1 www 931:
932:
933:
934:
935:
936:
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