Annotation of rat/lonpageflip.pm, revision 1.94
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.94 ! raeburn 5: # $Id: lonpageflip.pm,v 1.93 2017/02/20 18:29:33 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 $result;
277: } else {
278: return &first_accessible_resource();
279: }
280: }
281:
1.92 raeburn 282: sub check_for_syllabus {
283: my ($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;
1.92 raeburn 294: }
295: }
1.93 raeburn 296: return $usehttp;
1.92 raeburn 297: }
298:
1.1 www 299: # ================================================================ Main Handler
300:
301: sub handler {
1.2 www 302: my $r=shift;
1.1 www 303:
304: # ------------------------------------------- Set document type for header only
305:
1.2 www 306: if ($r->header_only) {
1.51 albertel 307: &Apache::loncommon::content_type($r,'text/html');
308: $r->send_http_header;
309: return OK;
1.2 www 310: }
311:
1.5 www 312: my %cachehash=();
313: my $multichoice=0;
314: my %multichoicehash=();
1.90 raeburn 315: my ($redirecturl,$redirectsymb,$enc,$anchor);
1.4 www 316: my $next='';
1.94 ! raeburn 317: my $hostname = $r->hostname();
1.4 www 318: my @possibilities=();
1.37 www 319: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53 albertel 320: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
1.88 raeburn 321: my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
1.89 raeburn 322: if ($currenturl=~m|^/enc/|) {
323: $currenturl=&Apache::lonenc::unencrypted($currenturl);
324: }
325: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
326: $currenturl=~s/^https?\:\/\///;
327: $currenturl=~s/^[^\/]+//;
328: my ($preupdatepos,$last,$reinitcheck);
329: if ($direction eq 'return') {
330: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
331: &GDBM_READER(),0640)) {
332: $last=$hash{'last_known'};
333: untie(%hash);
334: }
1.91 raeburn 335: } elsif ($direction eq 'firstanswerable') {
336: my $furl = &first_answerable_ressymb();
1.93 raeburn 337: my $usehttp = &check_for_syllabus(\$furl);
1.94 ! raeburn 338: if (($usehttp) && ($hostname ne '')) {
! 339: $furl='http://'.$hostname.$furl;
1.93 raeburn 340: } else {
341: $furl=&Apache::lonnet::absolute_url().$furl;
342: }
1.91 raeburn 343: &Apache::loncommon::content_type($r,'text/html');
1.93 raeburn 344: $r->header_out(Location => $furl);
1.91 raeburn 345: return REDIRECT;
346: } elsif ($direction eq 'endplacement') {
347: &Apache::loncommon::content_type($r,'text/html');
348: $r->send_http_header;
349: $r->print(&Apache::lonplacementtest::showresult());
350: return OK;
1.89 raeburn 351: }
1.87 raeburn 352: if ($env{'request.course.id'}) {
353: # Check if course needs to be re-initialized
354: my $loncaparev = $r->dir_config('lonVersion');
1.89 raeburn 355: ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
356: if ($reinitcheck eq 'switch') {
1.87 raeburn 357: &Apache::loncommon::content_type($r,'text/html');
358: $r->send_http_header;
359: $r->print(&Apache::loncommon::check_release_result(@reinit));
360: return OK;
1.89 raeburn 361: } elsif ($reinitcheck eq 'update') {
1.87 raeburn 362: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
363: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1.89 raeburn 364: $preupdatepos = &Apache::lonnet::symbread($currenturl);
365: unless ($direction eq 'return') {
366: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
367: &GDBM_READER(),0640)) {
368: $last=$hash{'last_known'};
369: untie(%hash);
370: }
371: }
1.87 raeburn 372: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
373: if ($ferr) {
374: my $requrl = $r->uri;
375: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
376: $env{'user.reinit'} = 1;
377: return HTTP_NOT_ACCEPTABLE;
1.89 raeburn 378: } else {
379: if ($last) {
380: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
381: unless (&Apache::lonnet::symbverify($last,$fn)) {
382: undef($last);
383: }
384: }
1.87 raeburn 385: }
386: }
387: }
1.54 albertel 388: if ($direction eq 'firstres') {
1.69 www 389: my $furl=&first_accessible_resource();
1.93 raeburn 390: my $usehttp = &check_for_syllabus(\$furl);
1.94 ! raeburn 391: if (($usehttp) && ($hostname ne '')) {
! 392: $furl='http://'.$hostname.$furl;
1.93 raeburn 393: } else {
394: $furl=&Apache::lonnet::absolute_url().$furl;
395: }
1.54 albertel 396: &Apache::loncommon::content_type($r,'text/html');
1.93 raeburn 397: $r->header_out(Location => $furl);
1.54 albertel 398: return REDIRECT;
399: }
1.89 raeburn 400: if ($direction eq 'return') {
1.10 www 401: # -------------------------------------------------------- Return to last known
1.93 raeburn 402: my ($newloc,$usehttp);
1.53 albertel 403: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36 www 404: &GDBM_READER(),0640))) {
1.52 albertel 405: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50 albertel 406: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
407: $newloc=$hash{'src_'.$id};
408: if ($newloc) {
1.93 raeburn 409: $usehttp = &check_for_syllabus(\$newloc);
1.92 raeburn 410: if ($hash{'encrypted_'.$id}) {
411: $newloc=&Apache::lonenc::encrypted($newloc);
412: } elsif ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)\#([^\#]+)$}) {
413: $newloc = $1.&escape('#').$2;
414: }
1.50 albertel 415: } else {
1.57 www 416: $newloc='/adm/navmaps';
1.50 albertel 417: }
1.36 www 418: untie %hash;
1.10 www 419: } else {
1.57 www 420: $newloc='/adm/navmaps';
1.89 raeburn 421: }
1.94 ! raeburn 422: if (($usehttp) && ($hostname ne '')) {
! 423: $newloc='http://'.$hostname.$newloc;
1.93 raeburn 424: } else {
425: $newloc=&Apache::lonnet::absolute_url().$newloc
426: }
1.89 raeburn 427: &Apache::loncommon::content_type($r,'text/html');
1.93 raeburn 428: $r->header_out(Location => $newloc);
1.89 raeburn 429: return REDIRECT;
1.10 www 430: }
1.35 www 431: #
432: # Is the current URL on the map? If not, start with last known URL
433: #
1.89 raeburn 434:
1.35 www 435: unless (&Apache::lonnet::is_on_map($currenturl)) {
1.89 raeburn 436: if ($preupdatepos) {
437: undef($preupdatepos);
438: } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
439: &GDBM_READER(),0640)) {
440: $last=$hash{'last_known'};
1.7 www 441: untie(%hash);
442: }
1.89 raeburn 443: my $newloc;
1.7 www 444: if ($last) {
1.52 albertel 445: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7 www 446: } else {
1.89 raeburn 447: &Apache::loncommon::content_type($r,'text/html');
448: $r->header_out(Location =>
449: &Apache::lonnet::absolute_url().
450: '/adm/navmaps');
451: return REDIRECT;
1.7 www 452: }
453: }
1.3 www 454: # ------------------------------------------- Do we have any idea where we are?
455: my $position;
1.89 raeburn 456: if ($preupdatepos) {
457: $position = $preupdatepos;
458: } else {
459: $position=Apache::lonnet::symbread($currenturl);
460: }
461: if ($position) {
1.3 www 462: # ------------------------------------------------------------------------- Yes
1.41 www 463: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52 albertel 464: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23 www 465: $cachehash{$startoutmap}{'last_known'}=
1.52 albertel 466: [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20 albertel 467:
1.5 www 468: # ============================================================ Tie the big hash
1.53 albertel 469: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 470: &GDBM_READER(),0640)) {
1.29 www 471: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
472: '.'.$mapnum;
1.14 www 473:
1.15 www 474: # ------------------------------------------------- Move forward, backward, etc
1.22 www 475: my $endupmap;
476: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 477: # -------------------------------------- Do we have one and only one empty URL?
1.22 www 478: # We are now at at least one non-empty URL
1.4 www 479: # ----------------------------------------------------- Check out possibilities
480: if ($next) {
481: @possibilities=split(/\,/,$next);
482: if ($#possibilities==0) {
1.5 www 483: # ---------------------------------------------- Only one possibility, redirect
1.90 raeburn 484: ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
1.52 albertel 485: $cachehash{$endupmap}{$redirecturl}=
486: [$redirecturl,(split(/\./,$next))[1]];
1.4 www 487: } else {
1.5 www 488: # ------------------------ There are multiple possibilities for a next resource
489: $multichoice=1;
1.62 albertel 490: foreach my $id (@possibilities) {
491: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
492: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
493: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
494: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
495: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
496: $multichoicehash{'symb_'.$id} =
1.32 bowersj2 497: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
498: $second.'___'.$symbSrc);
499:
1.62 albertel 500: my ($choicemap,$choiceres)=split(/\./,$id);
1.52 albertel 501: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62 albertel 502: my $url=$multichoicehash{'src_'.$id};
1.52 albertel 503: $cachehash{$map}{$url}=[$url,$choiceres];
1.62 albertel 504: }
1.4 www 505: }
1.5 www 506: } else {
507: # -------------------------------------------------------------- No place to go
508: $multichoice=-1;
1.4 www 509: }
1.5 www 510: # ----------------- The program must come past this point to untie the big hash
1.3 www 511: untie(%hash);
1.5 www 512: # --------------------------------------------------------- Store position info
1.52 albertel 513: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.86 raeburn 514: foreach my $thismap (keys(%cachehash)) {
1.52 albertel 515: my $mapnum=$cachehash{$thismap}->{'mapnum'};
516: delete($cachehash{$thismap}->{'mapnum'});
517: &Apache::lonnet::symblist($thismap,
518: %{$cachehash{$thismap}});
1.19 www 519: }
1.5 www 520: # ============================================== Do not return before this line
1.4 www 521: if ($redirecturl) {
1.5 www 522: # ----------------------------------------------------- There is a URL to go to
1.38 www 523: if ($direction eq 'forward') {
524: &Apache::lonnet::linklog($currenturl,$redirecturl);
525: }
526: if ($direction eq 'back') {
527: &Apache::lonnet::linklog($redirecturl,$currenturl);
528: }
1.85 musolffc 529: # ------------------------------------- Check for and display critical messages
530: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300);
1.89 raeburn 531: unless ($redirect) {
1.93 raeburn 532: my $usehttp = &check_for_syllabus(\$redirecturl);
1.94 ! raeburn 533: if (($usehttp) && ($hostname ne '')) {
! 534: $url='http://'.$hostname.$redirecturl;
1.93 raeburn 535: } else {
536: $url=&Apache::lonnet::absolute_url().$redirecturl;
537: }
1.90 raeburn 538: my $addanchor;
539: if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
540: $addanchor = 1;
541: $url =~ s/\#.+$//;
542: }
1.89 raeburn 543: $url = &add_get_param($url, { 'symb' => $redirectsymb});
1.90 raeburn 544: if ($addanchor) {
545: $url .= $anchor;
546: }
1.85 musolffc 547: }
1.89 raeburn 548: &Apache::loncommon::content_type($r,'text/html');
1.56 albertel 549: $r->header_out(Location => $url);
1.4 www 550: return REDIRECT;
1.5 www 551: } else {
552: # --------------------------------------------------------- There was a problem
1.51 albertel 553: &Apache::loncommon::content_type($r,'text/html');
1.8 www 554: $r->send_http_header;
1.59 www 555: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
556: 'explain' =>
557: 'You have reached the end of the sequence of materials.',
558: 'back' => 'Go Back',
1.83 raeburn 559: 'nav' => 'Course Contents',
1.59 www 560: 'wherenext' =>
561: 'There are several possibilities of where to go next',
562: 'pick' =>
563: 'Please click on the the resource you intend to access',
564: 'titleheader' => 'Title',
1.89 raeburn 565: 'type' => 'Type',
566: 'update' => 'Content updated',
567: '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 568: 'gonav' => 'Go to the Contents page to select a resource to display.',
569: );
1.83 raeburn 570: if (&Apache::loncommon::course_type() eq 'Community') {
571: $lt{'nav'} = &mt('Community Contents');
572: }
1.8 www 573: if ($#possibilities>0) {
1.67 albertel 574: my $start_page=
575: &Apache::loncommon::start_page('Multiple Resources');
1.8 www 576: $r->print(<<ENDSTART);
1.67 albertel 577: $start_page
1.59 www 578: <h3>$lt{'wherenext'}</h3>
1.8 www 579: <p>
1.59 www 580: $lt{'pick'}:
1.8 www 581: <p>
1.79 bisitz 582: <table border="2">
1.59 www 583: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8 www 584: ENDSTART
1.62 albertel 585: foreach my $id (@possibilities) {
1.92 raeburn 586: my $src = $multichoicehash{'src_'.$id};
1.93 raeburn 587: my $usehttp = &check_for_syllabus(\$src);
1.94 ! raeburn 588: if (($usehttp) && ($hostname ne '')) {
! 589: $src = 'http://'.$hostname.$src;
1.93 raeburn 590: }
1.8 www 591: $r->print(
592: '<tr><td><a href="'.
1.92 raeburn 593: &add_get_param($src,
1.66 albertel 594: {'symb' =>
595: $multichoicehash{'symb_'.$id},
596: }).'">'.
1.62 albertel 597: $multichoicehash{'title_'.$id}.
598: '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8 www 599: '</td></tr>');
1.26 www 600: }
1.59 www 601: $r->print('</table>');
1.8 www 602: } else {
1.89 raeburn 603: if ($reinitcheck) {
604: if (&Apache::loncommon::course_type() eq 'Community') {
605: $r->print(
606: &Apache::loncommon::start_page('Community Contents Updated'));
607: } else {
608: $r->print(
609: &Apache::loncommon::start_page('Course Contents Updated'));
610: }
611: $r->print('<h2>'.$lt{'update'}.'</h2>'
612: .'<p>'.$lt{'expupdate'}.'<br />'
613: .$lt{'gonav'}.'</p>');
614: } else {
1.91 raeburn 615: if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
616: (!$env{'request.role.adv'})) {
617: my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
618: if ($incomplete) {
619: $r->print(&Apache::lonplacementtest::showincomplete($incomplete));
620: } else {
621: $r->print(&Apache::lonplacementtest::showresult(1));
622: }
623: } else {
624: $r->print(
625: &Apache::loncommon::start_page('No Resource')
626: .'<h2>'.$lt{'title'}.'</h2>'
627: .'<p>'.$lt{'explain'}.'</p>');
628: }
629: }
630: }
631: unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') ||
632: ($env{'request.role.adv'})) {
633: if ((!@possibilities) && ($reinitcheck)) {
634: $r->print(
635: &Apache::lonhtmlcommon::actionbox(
636: ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
637: ]));
638: } else {
1.89 raeburn 639: $r->print(
1.91 raeburn 640: &Apache::lonhtmlcommon::actionbox(
641: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
642: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
643: ]));
1.89 raeburn 644: }
1.91 raeburn 645:
1.82 bisitz 646: }
1.89 raeburn 647: $r->print(&Apache::loncommon::end_page());
648:
1.59 www 649: return OK;
650: }
1.5 www 651: } else {
652: # ------------------------------------------------- Problem, could not tie hash
1.53 albertel 653: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5 www 654: return HTTP_NOT_ACCEPTABLE;
1.3 www 655: }
1.5 www 656: } else {
657: # ---------------------------------------- No, could not determine where we are
1.42 albertel 658: $r->internal_redirect('/adm/ambiguous');
1.81 raeburn 659: return OK;
1.2 www 660: }
1.5 www 661: } else {
1.2 www 662: # -------------------------- Class was not initialized or page fliped strangely
1.53 albertel 663: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2 www 664: return HTTP_NOT_ACCEPTABLE;
665: }
1.1 www 666: }
667:
668: 1;
669: __END__
670:
1.77 jms 671: =pod
672:
673: =head1 NAME
674:
675: Apache::lonpageflip
676:
677: =head1 SYNOPSIS
678:
679: Deals with forward, backward, and other page flips.
680:
681: This is part of the LearningOnline Network with CAPA project
682: described at http://www.lon-capa.org.
683:
684: =head1 OVERVIEW
685:
686: (empty)
687:
688: =head1 SUBROUTINES
689:
690: =over cleanup()
691:
692: =item addrid()
693:
694: =item fullmove()
695:
696: =item hash_src()
697:
698: =item move()
699:
700: =item get_next_possible_move()
701:
702: =item first_accessible_resource()
703:
704: =item handler()
705:
706: =back
707:
708: =cut
1.1 www 709:
710:
711:
712:
713:
714:
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