Annotation of rat/lonpageflip.pm, revision 1.97
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.97 ! raeburn 5: # $Id: lonpageflip.pm,v 1.96 2017/06/26 01:57:11 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 $allowed=0;
105: do {
106: ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
107:
108: my $url = $hash{'src_'.$next};
109: my ($mapid,$resid)=split(/\./,$next);
110: my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
111: $resid,$url);
112: if ($url eq '' || $symb eq '') {
113: $allowed = 0;
114: } else {
115: my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
116: $allowed = (($priv eq 'F') || ($priv eq '2'));
117: }
118: $safecount++;
119: } while ( ($next)
120: && ($next!~/\,/)
121: && (
122: (!$hash{'src_'.$next})
123: || (
124: (!$env{'request.role.adv'})
125: && $hash{'randomout_'.$next}
126: )
127: || (!$allowed)
128: )
129: && ($safecount<10000));
130:
131: return ($next,$endupmap);
132: }
133:
134: sub get_next_possible_move {
1.15 www 135: my ($rid,$mapurl,$direction)=@_;
1.23 www 136: my $startoutrid=$rid;
1.15 www 137:
138: my $next='';
139:
140: my $mincond=1;
141: my $posnext='';
142: if ($direction eq 'forward') {
143: # --------------------------------------------------------------------- Forward
1.33 www 144: while ($hash{'type_'.$rid} eq 'finish') {
145: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15 www 146: }
1.61 albertel 147: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.64 albertel 148: my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
149: my $rescond = &Apache::lonnet::docondval($condition);
150: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
151: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
152: if ($thiscond>=$mincond) {
1.15 www 153: if ($posnext) {
1.61 albertel 154: $posnext.=','.$id.':'.$thiscond;
1.15 www 155: } else {
1.61 albertel 156: $posnext=$id.':'.$thiscond;
1.15 www 157: }
158: if ($thiscond>$mincond) { $mincond=$thiscond; }
159: }
1.61 albertel 160: }
161: foreach my $id (split(/\,/,$posnext)) {
162: my ($linkid,$condval)=split(/\:/,$id);
1.15 www 163: if ($condval>=$mincond) {
164: $next=&addrid($next,$hash{'goesto_'.$linkid},
165: $hash{'condid_'.$hash{'undercond_'.$linkid}});
166: }
1.61 albertel 167: }
1.15 www 168: if ($hash{'is_map_'.$next}) {
1.23 www 169: # This jumps to the beginning of a new map (going down level)
1.15 www 170: if (
171: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
172: $mapurl=$hash{'src_'.$next};
173: $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47 raeburn 174: } elsif (
175: # This jumps back up from an empty sequence, to a page up one level
176: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
177: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 178: }
1.23 www 179: } elsif
180: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
181: # This comes up from a map (coming up one level);
182: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61 albertel 183: }
1.15 www 184: } elsif ($direction eq 'back') {
185: # ------------------------------------------------------------------- Backwards
1.33 www 186: while ($hash{'type_'.$rid} eq 'start') {
187: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
188: }
1.62 albertel 189: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
1.64 albertel 190: my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
191: my $rescond = &Apache::lonnet::docondval($condition);
192: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
193: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
1.62 albertel 194: if ($thiscond>=$mincond) {
195: if ($posnext) {
196: $posnext.=','.$id.':'.$thiscond;
197: } else {
198: $posnext=$id.':'.$thiscond;
199: }
200: if ($thiscond>$mincond) { $mincond=$thiscond; }
201: }
202: }
203: foreach my $id (split(/\,/,$posnext)) {
204: my ($linkid,$condval)=split(/\:/,$id);
205: if ($condval>=$mincond) {
206: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
207: $hash{'condid_'.$hash{'undercond_'.$linkid}});
208: }
209: }
1.15 www 210: if ($hash{'is_map_'.$next}) {
1.24 www 211: # This jumps to the end of a new map (going down one level)
1.15 www 212: if (
213: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
214: $mapurl=$hash{'src_'.$next};
215: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47 raeburn 216: } elsif (
217: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
218: # This jumps back up from an empty sequence, to a page up one level
219: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
220: }
1.24 www 221: } elsif
222: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
223: # This comes back up from a map (going up one level);
224: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 225: }
226: }
227: return ($next,$mapurl);
228: }
229:
1.69 www 230: sub first_accessible_resource {
231: my $furl;
232: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
233: &GDBM_READER(),0640)) {
234: $furl=$hash{'first_url'};
1.74 albertel 235: my %args;
236: my ($url,$args) = split(/\?/,$furl);
237: foreach my $pair (split(/\&/,$args)) {
238: my ($name,$value) = split(/=/,$pair);
239: $args{&unescape($name)} = &unescape($value);
240: }
241: if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
1.69 www 242: # Wow, we cannot see this ... move forward to the next one that we can see
243: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
244: # Build the new URL
1.73 albertel 245: my ($newmapid,$newresid)=split(/\./,$newrid);
1.69 www 246: my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
247: $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
248: if ($hash{'encrypted_'.$newrid}) {
249: $furl=&Apache::lonenc::encrypted($furl);
250: }
251: }
252: untie(%hash);
253: return $furl;
254: } else {
255: return '/adm/navmaps';
256: }
257: }
258:
1.91 raeburn 259: sub first_answerable_ressymb {
260: my $navmap = Apache::lonnavmaps::navmap->new;
261: return unless (ref($navmap));
262: my $iterator = $navmap->getIterator(undef,undef,undef,1);
263: return unless (ref($iterator));
264: my ($curRes,$result);
265: while ($curRes = $iterator->next()) {
266: if (ref($curRes) && $curRes->is_problem()) {
267: foreach my $part (@{$curRes->parts()}) {
268: if ($curRes->tries($part) < $curRes->maxtries($part)) {
269: $result = $curRes->link().'?symb='.$curRes->shown_symb();
270: last;
271: }
272: }
273: }
274: }
275: if ($result) {
276: return $result;
277: } else {
278: return &first_accessible_resource();
279: }
280: }
281:
1.95 raeburn 282: sub check_http_req {
1.92 raeburn 283: my ($srcref) = @_;
284: return unless (ref($srcref) eq 'SCALAR');
1.93 raeburn 285: my $usehttp;
1.92 raeburn 286: if ($env{'request.course.id'}) {
287: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
288: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
289: if (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
290: ($ENV{'SERVER_PORT'} == 443) &&
291: ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
292: $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
1.93 raeburn 293: $usehttp = 1;
1.95 raeburn 294: } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
295: ($ENV{'SERVER_PORT'} == 443)) {
296: $usehttp = 1;
1.92 raeburn 297: }
298: }
1.93 raeburn 299: return $usehttp;
1.92 raeburn 300: }
301:
1.97 ! raeburn 302: sub reinited_js {
! 303: my ($url,$cid,$timeout) = @_;
! 304: if (!$timeout) {
! 305: $timeout = 0;
! 306: }
! 307: return <<"END";
! 308: <script type="text/javascript">
! 309: // <![CDATA[
! 310: setTimeout(function() {
! 311: var newurl = '$url';
! 312: if (document.getElementById('LC_update_$cid')) {
! 313: document.getElementById('LC_update_$cid').style.display = 'none';
! 314: }
! 315: if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
! 316: window.location.href = "$url";
! 317: }
! 318: }, $timeout);
! 319: // ]]>
! 320: </script>
! 321: END
! 322: }
! 323:
1.1 www 324: # ================================================================ Main Handler
325:
326: sub handler {
1.2 www 327: my $r=shift;
1.1 www 328:
329: # ------------------------------------------- Set document type for header only
330:
1.2 www 331: if ($r->header_only) {
1.51 albertel 332: &Apache::loncommon::content_type($r,'text/html');
333: $r->send_http_header;
334: return OK;
1.2 www 335: }
336:
1.5 www 337: my %cachehash=();
338: my $multichoice=0;
339: my %multichoicehash=();
1.97 ! raeburn 340: my %prog_state=();
1.90 raeburn 341: my ($redirecturl,$redirectsymb,$enc,$anchor);
1.4 www 342: my $next='';
1.94 raeburn 343: my $hostname = $r->hostname();
1.4 www 344: my @possibilities=();
1.37 www 345: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53 albertel 346: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
1.88 raeburn 347: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
1.89 raeburn 348: if ($currenturl=~m|^/enc/|) {
349: $currenturl=&Apache::lonenc::unencrypted($currenturl);
350: }
351: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
352: $currenturl=~s/^https?\:\/\///;
353: $currenturl=~s/^[^\/]+//;
354: my ($preupdatepos,$last,$reinitcheck);
355: if ($direction eq 'return') {
356: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
357: &GDBM_READER(),0640)) {
358: $last=$hash{'last_known'};
359: untie(%hash);
360: }
1.91 raeburn 361: } elsif ($direction eq 'firstanswerable') {
362: my $furl = &first_answerable_ressymb();
1.95 raeburn 363: my $usehttp = &check_http_req(\$furl);
1.94 raeburn 364: if (($usehttp) && ($hostname ne '')) {
365: $furl='http://'.$hostname.$furl;
1.93 raeburn 366: } else {
367: $furl=&Apache::lonnet::absolute_url().$furl;
368: }
1.91 raeburn 369: &Apache::loncommon::content_type($r,'text/html');
1.93 raeburn 370: $r->header_out(Location => $furl);
1.91 raeburn 371: return REDIRECT;
372: } elsif ($direction eq 'endplacement') {
373: &Apache::loncommon::content_type($r,'text/html');
374: $r->send_http_header;
375: $r->print(&Apache::lonplacementtest::showresult());
376: return OK;
1.89 raeburn 377: }
1.87 raeburn 378: if ($env{'request.course.id'}) {
379: # Check if course needs to be re-initialized
380: my $loncaparev = $r->dir_config('lonVersion');
1.89 raeburn 381: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
382: if ($reinitcheck eq 'switch') {
1.87 raeburn 383: &Apache::loncommon::content_type($r,'text/html');
384: $r->send_http_header;
385: $r->print(&Apache::loncommon::check_release_result(@reinit));
386: return OK;
1.89 raeburn 387: } elsif ($reinitcheck eq 'update') {
1.87 raeburn 388: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
389: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1.89 raeburn 390: $preupdatepos = &Apache::lonnet::symbread($currenturl);
391: unless ($direction eq 'return') {
392: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
393: &GDBM_READER(),0640)) {
394: $last=$hash{'last_known'};
395: untie(%hash);
396: }
397: }
1.97 ! raeburn 398: &Apache::loncommon::content_type($r,'text/html');
! 399: $r->send_http_header;
! 400: $r->print(&Apache::loncommon::start_page('Content Changed'));
! 401: my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
! 402: '<br />'.
! 403: &mt('Your course session is being updated because of recent changes by course personnel.').
! 404: ' '.&mt('Please be patient.').'<br /></div>'.
! 405: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
! 406: %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
! 407: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
1.87 raeburn 408: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
1.97 ! raeburn 409: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished'));
1.87 raeburn 410: if ($ferr) {
1.97 ! raeburn 411: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1.87 raeburn 412: my $requrl = $r->uri;
413: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
414: $env{'user.reinit'} = 1;
415: return HTTP_NOT_ACCEPTABLE;
1.89 raeburn 416: } else {
417: if ($last) {
418: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
419: unless (&Apache::lonnet::symbverify($last,$fn)) {
420: undef($last);
421: }
422: }
1.87 raeburn 423: }
424: }
425: }
1.54 albertel 426: if ($direction eq 'firstres') {
1.69 www 427: my $furl=&first_accessible_resource();
1.95 raeburn 428: my $usehttp = &check_http_req(\$furl);
1.94 raeburn 429: if (($usehttp) && ($hostname ne '')) {
430: $furl='http://'.$hostname.$furl;
1.93 raeburn 431: } else {
432: $furl=&Apache::lonnet::absolute_url().$furl;
433: }
1.97 ! raeburn 434: if ($reinitcheck eq 'update') {
! 435: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
! 436: $r->print(&reinited_js($furl,$env{'request.course.id'},100));
! 437: $r->print(&Apache::loncommon::end_page());
! 438: return OK;
! 439: } else {
! 440: &Apache::loncommon::content_type($r,'text/html');
! 441: $r->header_out(Location => $furl);
! 442: return REDIRECT;
! 443: }
1.54 albertel 444: }
1.89 raeburn 445: if ($direction eq 'return') {
1.10 www 446: # -------------------------------------------------------- Return to last known
1.93 raeburn 447: my ($newloc,$usehttp);
1.53 albertel 448: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36 www 449: &GDBM_READER(),0640))) {
1.52 albertel 450: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50 albertel 451: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
452: $newloc=$hash{'src_'.$id};
453: if ($newloc) {
1.95 raeburn 454: $usehttp = &check_http_req(\$newloc);
1.92 raeburn 455: if ($hash{'encrypted_'.$id}) {
456: $newloc=&Apache::lonenc::encrypted($newloc);
457: } elsif ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)\#([^\#]+)$}) {
458: $newloc = $1.&escape('#').$2;
459: }
1.50 albertel 460: } else {
1.57 www 461: $newloc='/adm/navmaps';
1.50 albertel 462: }
1.36 www 463: untie %hash;
1.10 www 464: } else {
1.57 www 465: $newloc='/adm/navmaps';
1.89 raeburn 466: }
1.94 raeburn 467: if (($usehttp) && ($hostname ne '')) {
468: $newloc='http://'.$hostname.$newloc;
1.93 raeburn 469: } else {
470: $newloc=&Apache::lonnet::absolute_url().$newloc
471: }
1.97 ! raeburn 472: if ($reinitcheck eq 'update') {
! 473: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
! 474: $r->print(&Apache::loncommon::end_page());
! 475: return OK;
! 476: } else {
! 477: &Apache::loncommon::content_type($r,'text/html');
! 478: $r->header_out(Location => $newloc);
! 479: return REDIRECT;
! 480: }
1.10 www 481: }
1.35 www 482: #
483: # Is the current URL on the map? If not, start with last known URL
484: #
1.89 raeburn 485:
1.35 www 486: unless (&Apache::lonnet::is_on_map($currenturl)) {
1.89 raeburn 487: if ($preupdatepos) {
488: undef($preupdatepos);
489: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
490: &GDBM_READER(),0640)) {
491: $last=$hash{'last_known'};
1.7 www 492: untie(%hash);
493: }
1.89 raeburn 494: my $newloc;
1.7 www 495: if ($last) {
1.52 albertel 496: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7 www 497: } else {
1.97 ! raeburn 498: my $newloc = &Apache::lonnet::absolute_url().
! 499: '/adm/navmaps';
! 500: if ($reinitcheck eq 'update') {
! 501: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
! 502: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
! 503: $r->print(&Apache::loncommon::end_page());
! 504: return OK;
! 505: } else {
! 506: &Apache::loncommon::content_type($r,'text/html');
! 507: $r->header_out(Location => $newloc);
! 508: return REDIRECT;
! 509: }
1.7 www 510: }
511: }
1.3 www 512: # ------------------------------------------- Do we have any idea where we are?
513: my $position;
1.89 raeburn 514: if ($preupdatepos) {
515: $position = $preupdatepos;
516: } else {
517: $position=Apache::lonnet::symbread($currenturl);
518: }
519: if ($position) {
1.3 www 520: # ------------------------------------------------------------------------- Yes
1.41 www 521: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52 albertel 522: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23 www 523: $cachehash{$startoutmap}{'last_known'}=
1.52 albertel 524: [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20 albertel 525:
1.5 www 526: # ============================================================ Tie the big hash
1.53 albertel 527: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 528: &GDBM_READER(),0640)) {
1.29 www 529: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
530: '.'.$mapnum;
1.14 www 531:
1.15 www 532: # ------------------------------------------------- Move forward, backward, etc
1.22 www 533: my $endupmap;
534: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 535: # -------------------------------------- Do we have one and only one empty URL?
1.22 www 536: # We are now at at least one non-empty URL
1.4 www 537: # ----------------------------------------------------- Check out possibilities
538: if ($next) {
539: @possibilities=split(/\,/,$next);
540: if ($#possibilities==0) {
1.5 www 541: # ---------------------------------------------- Only one possibility, redirect
1.90 raeburn 542: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
1.52 albertel 543: $cachehash{$endupmap}{$redirecturl}=
544: [$redirecturl,(split(/\./,$next))[1]];
1.4 www 545: } else {
1.5 www 546: # ------------------------ There are multiple possibilities for a next resource
547: $multichoice=1;
1.62 albertel 548: foreach my $id (@possibilities) {
549: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
550: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
551: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
552: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
553: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
554: $multichoicehash{'symb_'.$id} =
1.32 bowersj2 555: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
556: $second.'___'.$symbSrc);
557:
1.62 albertel 558: my ($choicemap,$choiceres)=split(/\./,$id);
1.52 albertel 559: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62 albertel 560: my $url=$multichoicehash{'src_'.$id};
1.52 albertel 561: $cachehash{$map}{$url}=[$url,$choiceres];
1.62 albertel 562: }
1.4 www 563: }
1.5 www 564: } else {
565: # -------------------------------------------------------------- No place to go
566: $multichoice=-1;
1.4 www 567: }
1.5 www 568: # ----------------- The program must come past this point to untie the big hash
1.3 www 569: untie(%hash);
1.5 www 570: # --------------------------------------------------------- Store position info
1.52 albertel 571: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.86 raeburn 572: foreach my $thismap (keys(%cachehash)) {
1.52 albertel 573: my $mapnum=$cachehash{$thismap}->{'mapnum'};
574: delete($cachehash{$thismap}->{'mapnum'});
575: &Apache::lonnet::symblist($thismap,
576: %{$cachehash{$thismap}});
1.19 www 577: }
1.5 www 578: # ============================================== Do not return before this line
1.4 www 579: if ($redirecturl) {
1.5 www 580: # ----------------------------------------------------- There is a URL to go to
1.38 www 581: if ($direction eq 'forward') {
582: &Apache::lonnet::linklog($currenturl,$redirecturl);
583: }
584: if ($direction eq 'back') {
585: &Apache::lonnet::linklog($redirecturl,$currenturl);
586: }
1.85 musolffc 587: # ------------------------------------- Check for and display critical messages
1.96 raeburn 588: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
1.89 raeburn 589: unless ($redirect) {
1.95 raeburn 590: my $usehttp = &check_http_req(\$redirecturl);
1.94 raeburn 591: if (($usehttp) && ($hostname ne '')) {
592: $url='http://'.$hostname.$redirecturl;
1.93 raeburn 593: } else {
594: $url=&Apache::lonnet::absolute_url().$redirecturl;
595: }
1.90 raeburn 596: my $addanchor;
597: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
598: $addanchor = 1;
599: $url =~ s/\#.+$//;
600: }
1.89 raeburn 601: $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.90 raeburn 602: if ($addanchor) {
603: $url .= $anchor;
604: }
1.85 musolffc 605: }
1.97 ! raeburn 606: if ($reinitcheck eq 'update') {
! 607: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
! 608: $r->print(&reinited_js($url,$env{'request.course.id'},100));
! 609: $r->print(&Apache::loncommon::end_page());
! 610: return OK;
! 611: } else {
! 612: &Apache::loncommon::content_type($r,'text/html');
! 613: $r->header_out(Location => $url);
! 614: return REDIRECT;
! 615: }
1.5 www 616: } else {
617: # --------------------------------------------------------- There was a problem
1.51 albertel 618: &Apache::loncommon::content_type($r,'text/html');
1.8 www 619: $r->send_http_header;
1.59 www 620: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
621: 'explain' =>
622: 'You have reached the end of the sequence of materials.',
623: 'back' => 'Go Back',
1.83 raeburn 624: 'nav' => 'Course Contents',
1.59 www 625: 'wherenext' =>
626: 'There are several possibilities of where to go next',
627: 'pick' =>
628: 'Please click on the the resource you intend to access',
629: 'titleheader' => 'Title',
1.89 raeburn 630: 'type' => 'Type',
631: 'update' => 'Content updated',
632: 'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
1.91 raeburn 633: 'gonav' => 'Go to the Contents page to select a resource to display.',
634: );
1.83 raeburn 635: if (&Apache::loncommon::course_type() eq 'Community') {
636: $lt{'nav'} = &mt('Community Contents');
637: }
1.8 www 638: if ($#possibilities>0) {
1.67 albertel 639: my $start_page=
640: &Apache::loncommon::start_page('Multiple Resources');
1.8 www 641: $r->print(<<ENDSTART);
1.67 albertel 642: $start_page
1.59 www 643: <h3>$lt{'wherenext'}</h3>
1.8 www 644: <p>
1.59 www 645: $lt{'pick'}:
1.8 www 646: <p>
1.79 bisitz 647: <table border="2">
1.59 www 648: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8 www 649: ENDSTART
1.62 albertel 650: foreach my $id (@possibilities) {
1.92 raeburn 651: my $src = $multichoicehash{'src_'.$id};
1.95 raeburn 652: my $usehttp = &check_http_req(\$src);
1.94 raeburn 653: if (($usehttp) && ($hostname ne '')) {
654: $src = 'http://'.$hostname.$src;
1.93 raeburn 655: }
1.8 www 656: $r->print(
657: '<tr><td><a href="'.
1.92 raeburn 658: &add_get_param($src,
1.66 albertel 659: {'symb' =>
660: $multichoicehash{'symb_'.$id},
661: }).'">'.
1.62 albertel 662: $multichoicehash{'title_'.$id}.
663: '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8 www 664: '</td></tr>');
1.26 www 665: }
1.59 www 666: $r->print('</table>');
1.8 www 667: } else {
1.89 raeburn 668: if ($reinitcheck) {
669: if (&Apache::loncommon::course_type() eq 'Community') {
670: $r->print(
671: &Apache::loncommon::start_page('Community Contents Updated'));
672: } else {
673: $r->print(
674: &Apache::loncommon::start_page('Course Contents Updated'));
675: }
676: $r->print('<h2>'.$lt{'update'}.'</h2>'
677: .'<p>'.$lt{'expupdate'}.'<br />'
678: .$lt{'gonav'}.'</p>');
679: } else {
1.91 raeburn 680: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
681: (!$env{'request.role.adv'})) {
682: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
683: if ($incomplete) {
684: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
685: } else {
686: $r->print(&Apache::lonplacementtest::showresult(1));
687: }
688: } else {
689: $r->print(
690: &Apache::loncommon::start_page('No Resource')
691: .'<h2>'.$lt{'title'}.'</h2>'
692: .'<p>'.$lt{'explain'}.'</p>');
693: }
694: }
695: }
696: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
697: ($env{'request.role.adv'})) {
698: if ((!@possibilities) && ($reinitcheck)) {
699: $r->print(
700: &Apache::lonhtmlcommon::actionbox(
701: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
702: ]));
703: } else {
1.89 raeburn 704: $r->print(
1.91 raeburn 705: &Apache::lonhtmlcommon::actionbox(
706: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
707: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
708: ]));
1.89 raeburn 709: }
1.91 raeburn 710:
1.82 bisitz 711: }
1.89 raeburn 712: $r->print(&Apache::loncommon::end_page());
713:
1.59 www 714: return OK;
715: }
1.5 www 716: } else {
717: # ------------------------------------------------- Problem, could not tie hash
1.97 ! raeburn 718: if ($reinitcheck eq 'update') {
! 719: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
! 720: $r->print(&Apache::loncommon::end_page());
! 721: }
1.53 albertel 722: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5 www 723: return HTTP_NOT_ACCEPTABLE;
1.3 www 724: }
1.5 www 725: } else {
726: # ---------------------------------------- No, could not determine where we are
1.97 ! raeburn 727: my $newloc = '/adm/ambiguous';
! 728: if ($reinitcheck eq 'update') {
! 729: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
! 730: $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
! 731: $r->print(&Apache::loncommon::end_page());
! 732: } else {
! 733: $r->internal_redirect($newloc);
! 734: }
1.81 raeburn 735: return OK;
1.2 www 736: }
1.5 www 737: } else {
1.2 www 738: # -------------------------- Class was not initialized or page fliped strangely
1.53 albertel 739: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2 www 740: return HTTP_NOT_ACCEPTABLE;
741: }
1.1 www 742: }
743:
744: 1;
745: __END__
746:
1.77 jms 747: =pod
748:
749: =head1 NAME
750:
751: Apache::lonpageflip
752:
753: =head1 SYNOPSIS
754:
755: Deals with forward, backward, and other page flips.
756:
757: This is part of the LearningOnline Network with CAPA project
758: described at http://www.lon-capa.org.
759:
760: =head1 OVERVIEW
761:
762: (empty)
763:
764: =head1 SUBROUTINES
765:
766: =over cleanup()
767:
768: =item addrid()
769:
770: =item fullmove()
771:
772: =item hash_src()
773:
774: =item move()
775:
776: =item get_next_possible_move()
777:
778: =item first_accessible_resource()
779:
780: =item handler()
781:
782: =back
783:
784: =cut
1.1 www 785:
786:
787:
788:
789:
790:
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