Annotation of rat/lonpageflip.pm, revision 1.87
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.87 ! raeburn 5: # $Id: lonpageflip.pm,v 1.86 2014/12/11 13:16:49 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();
1.87 ! raeburn 39: use Apache::lonuserstate;
1.84 raeburn 40: use Apache::lonlocal;
1.1 www 41: use HTML::TokeParser;
42: use GDBM_File;
43:
1.3 www 44: # ========================================================== Module Global Hash
45:
1.1 www 46: my %hash;
1.34 www 47:
48: sub cleanup {
49: if (tied(%hash)){
50: &Apache::lonnet::logthis('Cleanup pageflip: hash');
51: unless (untie(%hash)) {
52: &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
53: }
54: }
1.63 albertel 55: return OK;
1.34 www 56: }
1.1 www 57:
1.3 www 58: sub addrid {
1.4 www 59: my ($current,$new,$condid)=@_;
60: unless ($condid) { $condid=0; }
1.27 www 61:
1.3 www 62: if ($current) {
1.5 www 63: $current.=','.$new;
1.3 www 64: } else {
1.5 www 65: $current=''.$new;
1.3 www 66: }
1.27 www 67:
1.3 www 68: return $current;
1.25 www 69: }
70:
71: sub fullmove {
72: my ($rid,$mapurl,$direction)=@_;
1.53 albertel 73: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 74: &GDBM_READER(),0640)) {
1.25 www 75: ($rid,$mapurl)=&move($rid,$mapurl,$direction);
76: untie(%hash);
77: }
78: return($rid,$mapurl);
1.1 www 79: }
80:
1.50 albertel 81: sub hash_src {
82: my ($id)=@_;
1.56 albertel 83: my ($mapid,$resid)=split(/\./,$id);
84: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
85: $resid,$hash{'src_'.$id});
1.50 albertel 86: if ($hash{'encrypted_'.$id}) {
1.56 albertel 87: return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
88: &Apache::lonenc::encrypted($symb));
1.50 albertel 89: }
1.56 albertel 90: return ($hash{'src_'.$id},$symb);
1.50 albertel 91: }
92:
1.15 www 93: sub move {
1.72 albertel 94: my ($next,$endupmap,$direction) = @_;
95: my $safecount=0;
96: my $allowed=0;
97: do {
98: ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction);
99:
100: my $url = $hash{'src_'.$next};
101: my ($mapid,$resid)=split(/\./,$next);
102: my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
103: $resid,$url);
104: if ($url eq '' || $symb eq '') {
105: $allowed = 0;
106: } else {
107: my $priv = &Apache::lonnet::allowed('bre',$url,$symb);
108: $allowed = (($priv eq 'F') || ($priv eq '2'));
109: }
110: $safecount++;
111: } while ( ($next)
112: && ($next!~/\,/)
113: && (
114: (!$hash{'src_'.$next})
115: || (
116: (!$env{'request.role.adv'})
117: && $hash{'randomout_'.$next}
118: )
119: || (!$allowed)
120: )
121: && ($safecount<10000));
122:
123: return ($next,$endupmap);
124: }
125:
126: sub get_next_possible_move {
1.15 www 127: my ($rid,$mapurl,$direction)=@_;
1.23 www 128: my $startoutrid=$rid;
1.15 www 129:
130: my $next='';
131:
132: my $mincond=1;
133: my $posnext='';
134: if ($direction eq 'forward') {
135: # --------------------------------------------------------------------- Forward
1.33 www 136: while ($hash{'type_'.$rid} eq 'finish') {
137: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15 www 138: }
1.61 albertel 139: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.64 albertel 140: my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}};
141: my $rescond = &Apache::lonnet::docondval($condition);
142: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
143: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
144: if ($thiscond>=$mincond) {
1.15 www 145: if ($posnext) {
1.61 albertel 146: $posnext.=','.$id.':'.$thiscond;
1.15 www 147: } else {
1.61 albertel 148: $posnext=$id.':'.$thiscond;
1.15 www 149: }
150: if ($thiscond>$mincond) { $mincond=$thiscond; }
151: }
1.61 albertel 152: }
153: foreach my $id (split(/\,/,$posnext)) {
154: my ($linkid,$condval)=split(/\:/,$id);
1.15 www 155: if ($condval>=$mincond) {
156: $next=&addrid($next,$hash{'goesto_'.$linkid},
157: $hash{'condid_'.$hash{'undercond_'.$linkid}});
158: }
1.61 albertel 159: }
1.15 www 160: if ($hash{'is_map_'.$next}) {
1.23 www 161: # This jumps to the beginning of a new map (going down level)
1.15 www 162: if (
163: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
164: $mapurl=$hash{'src_'.$next};
165: $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47 raeburn 166: } elsif (
167: # This jumps back up from an empty sequence, to a page up one level
168: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
169: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 170: }
1.23 www 171: } elsif
172: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
173: # This comes up from a map (coming up one level);
174: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.61 albertel 175: }
1.15 www 176: } elsif ($direction eq 'back') {
177: # ------------------------------------------------------------------- Backwards
1.33 www 178: while ($hash{'type_'.$rid} eq 'start') {
179: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
180: }
1.62 albertel 181: foreach my $id (split(/\,/,$hash{'from_'.$rid})) {
1.64 albertel 182: my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}};
183: my $rescond = &Apache::lonnet::docondval($condition);
184: my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}});
185: my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond;
1.62 albertel 186: if ($thiscond>=$mincond) {
187: if ($posnext) {
188: $posnext.=','.$id.':'.$thiscond;
189: } else {
190: $posnext=$id.':'.$thiscond;
191: }
192: if ($thiscond>$mincond) { $mincond=$thiscond; }
193: }
194: }
195: foreach my $id (split(/\,/,$posnext)) {
196: my ($linkid,$condval)=split(/\:/,$id);
197: if ($condval>=$mincond) {
198: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
199: $hash{'condid_'.$hash{'undercond_'.$linkid}});
200: }
201: }
1.15 www 202: if ($hash{'is_map_'.$next}) {
1.24 www 203: # This jumps to the end of a new map (going down one level)
1.15 www 204: if (
205: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
206: $mapurl=$hash{'src_'.$next};
207: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47 raeburn 208: } elsif (
209: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
210: # This jumps back up from an empty sequence, to a page up one level
211: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
212: }
1.24 www 213: } elsif
214: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
215: # This comes back up from a map (going up one level);
216: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 217: }
218: }
219: return ($next,$mapurl);
220: }
221:
1.69 www 222: sub first_accessible_resource {
223: my $furl;
224: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
225: &GDBM_READER(),0640)) {
226: $furl=$hash{'first_url'};
1.74 albertel 227: my %args;
228: my ($url,$args) = split(/\?/,$furl);
229: foreach my $pair (split(/\&/,$args)) {
230: my ($name,$value) = split(/=/,$pair);
231: $args{&unescape($name)} = &unescape($value);
232: }
233: if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) {
1.69 www 234: # Wow, we cannot see this ... move forward to the next one that we can see
235: my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward');
236: # Build the new URL
1.73 albertel 237: my ($newmapid,$newresid)=split(/\./,$newrid);
1.69 www 238: my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid});
239: $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb });
240: if ($hash{'encrypted_'.$newrid}) {
241: $furl=&Apache::lonenc::encrypted($furl);
242: }
243: }
244: untie(%hash);
245: return $furl;
246: } else {
247: return '/adm/navmaps';
248: }
249: }
250:
1.1 www 251: # ================================================================ Main Handler
252:
253: sub handler {
1.2 www 254: my $r=shift;
1.1 www 255:
256: # ------------------------------------------- Set document type for header only
257:
1.2 www 258: if ($r->header_only) {
1.51 albertel 259: &Apache::loncommon::content_type($r,'text/html');
260: $r->send_http_header;
261: return OK;
1.2 www 262: }
263:
1.5 www 264: my %cachehash=();
265: my $multichoice=0;
266: my %multichoicehash=();
1.56 albertel 267: my ($redirecturl,$redirectsymb);
1.4 www 268: my $next='';
269: my @possibilities=();
1.37 www 270: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.53 albertel 271: if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
272: $env{'form.postdata'}=~/(\w+)\:(.*)/;
1.87 ! raeburn 273:
! 274: if ($env{'request.course.id'}) {
! 275: # Check if course needs to be re-initialized
! 276: my $loncaparev = $r->dir_config('lonVersion');
! 277: my ($result,@reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
! 278: if ($result eq 'switch') {
! 279: &Apache::loncommon::content_type($r,'text/html');
! 280: $r->send_http_header;
! 281: $r->print(&Apache::loncommon::check_release_result(@reinit));
! 282: return OK;
! 283: } elsif ($result eq 'update') {
! 284: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
! 285: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
! 286: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
! 287: if ($ferr) {
! 288: my $requrl = $r->uri;
! 289: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
! 290: $env{'user.reinit'} = 1;
! 291: return HTTP_NOT_ACCEPTABLE;
! 292: }
! 293: }
! 294: }
! 295:
1.2 www 296: my $direction=$1;
1.40 www 297: my $currenturl=$2;
1.50 albertel 298: if ($currenturl=~m|^/enc/|) {
299: $currenturl=&Apache::lonenc::unencrypted($currenturl);
300: }
1.46 www 301: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
1.54 albertel 302: if ($direction eq 'firstres') {
1.69 www 303: my $furl=&first_accessible_resource();
1.54 albertel 304: &Apache::loncommon::content_type($r,'text/html');
305: $r->header_out(Location =>
1.71 albertel 306: &Apache::lonnet::absolute_url().$furl);
1.54 albertel 307:
308: return REDIRECT;
309: }
1.80 droeschl 310: if ($direction eq 'return') {
1.10 www 311: # -------------------------------------------------------- Return to last known
312: my $last;
1.53 albertel 313: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28 albertel 314: &GDBM_READER(),0640)) {
1.10 www 315: $last=$hash{'last_known'};
316: untie(%hash);
317: }
318: my $newloc;
1.53 albertel 319: if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.36 www 320: &GDBM_READER(),0640))) {
1.52 albertel 321: my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
1.50 albertel 322: $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
323: $newloc=$hash{'src_'.$id};
324: if ($newloc) {
325: if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
326:
327: } else {
1.57 www 328: $newloc='/adm/navmaps';
1.50 albertel 329: }
1.36 www 330: untie %hash;
1.10 www 331: } else {
1.57 www 332: $newloc='/adm/navmaps';
1.10 www 333: }
1.54 albertel 334: &Apache::loncommon::content_type($r,'text/html');
335: $r->header_out(Location =>
1.71 albertel 336: &Apache::lonnet::absolute_url().$newloc);
1.54 albertel 337:
338: return REDIRECT;
1.10 www 339: }
1.78 raeburn 340: $currenturl=~s/^https?\:\/\///;
1.2 www 341: $currenturl=~s/^[^\/]+//;
1.35 www 342: #
343: # Is the current URL on the map? If not, start with last known URL
344: #
345: unless (&Apache::lonnet::is_on_map($currenturl)) {
1.7 www 346: my $last;
1.53 albertel 347: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.28 albertel 348: &GDBM_READER(),0640)) {
1.7 www 349: $last=$hash{'last_known'};
350: untie(%hash);
351: }
352: if ($last) {
1.52 albertel 353: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
1.7 www 354: } else {
1.54 albertel 355: &Apache::loncommon::content_type($r,'text/html');
356: $r->header_out(Location =>
1.71 albertel 357: &Apache::lonnet::absolute_url().
1.70 albertel 358: '/adm/noidea.html');
1.54 albertel 359: return REDIRECT;
1.7 www 360: }
361: }
1.3 www 362: # ------------------------------------------- Do we have any idea where we are?
363: my $position;
364: if ($position=Apache::lonnet::symbread($currenturl)) {
365: # ------------------------------------------------------------------------- Yes
1.41 www 366: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.52 albertel 367: $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
1.23 www 368: $cachehash{$startoutmap}{'last_known'}=
1.52 albertel 369: [&Apache::lonnet::declutter($currenturl),$mapnum];
1.20 albertel 370:
1.5 www 371: # ============================================================ Tie the big hash
1.53 albertel 372: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
1.28 albertel 373: &GDBM_READER(),0640)) {
1.29 www 374: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
375: '.'.$mapnum;
1.14 www 376:
1.15 www 377: # ------------------------------------------------- Move forward, backward, etc
1.22 www 378: my $endupmap;
379: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 380: # -------------------------------------- Do we have one and only one empty URL?
1.22 www 381: # We are now at at least one non-empty URL
1.4 www 382: # ----------------------------------------------------- Check out possibilities
383: if ($next) {
384: @possibilities=split(/\,/,$next);
385: if ($#possibilities==0) {
1.5 www 386: # ---------------------------------------------- Only one possibility, redirect
1.56 albertel 387: ($redirecturl,$redirectsymb)=&hash_src($next);
1.52 albertel 388: $cachehash{$endupmap}{$redirecturl}=
389: [$redirecturl,(split(/\./,$next))[1]];
1.4 www 390: } else {
1.5 www 391: # ------------------------ There are multiple possibilities for a next resource
392: $multichoice=1;
1.62 albertel 393: foreach my $id (@possibilities) {
394: $multichoicehash{'src_'.$id}=$hash{'src_'.$id};
395: $multichoicehash{'title_'.$id}=$hash{'title_'.$id};
396: $multichoicehash{'type_'.$id}=$hash{'type_'.$id};
397: (my $first, my $second) = $id =~ /(\d+).(\d+)/;
398: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
399: $multichoicehash{'symb_'.$id} =
1.32 bowersj2 400: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
401: $second.'___'.$symbSrc);
402:
1.62 albertel 403: my ($choicemap,$choiceres)=split(/\./,$id);
1.52 albertel 404: my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
1.62 albertel 405: my $url=$multichoicehash{'src_'.$id};
1.52 albertel 406: $cachehash{$map}{$url}=[$url,$choiceres];
1.62 albertel 407: }
1.4 www 408: }
1.5 www 409: } else {
410: # -------------------------------------------------------------- No place to go
411: $multichoice=-1;
1.4 www 412: }
1.5 www 413: # ----------------- The program must come past this point to untie the big hash
1.3 www 414: untie(%hash);
1.5 www 415: # --------------------------------------------------------- Store position info
1.52 albertel 416: $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
1.86 raeburn 417: foreach my $thismap (keys(%cachehash)) {
1.52 albertel 418: my $mapnum=$cachehash{$thismap}->{'mapnum'};
419: delete($cachehash{$thismap}->{'mapnum'});
420: &Apache::lonnet::symblist($thismap,
421: %{$cachehash{$thismap}});
1.19 www 422: }
1.5 www 423: # ============================================== Do not return before this line
1.4 www 424: if ($redirecturl) {
1.5 www 425: # ----------------------------------------------------- There is a URL to go to
1.38 www 426: if ($direction eq 'forward') {
427: &Apache::lonnet::linklog($currenturl,$redirecturl);
428: }
429: if ($direction eq 'back') {
430: &Apache::lonnet::linklog($redirecturl,$currenturl);
431: }
1.85 musolffc 432: # ------------------------------------- Check for and display critical messages
433: my ($redirect, $url) = &Apache::loncommon::critical_redirect(300);
434: unless ($redirect) {
435: $url=&Apache::lonnet::absolute_url().$redirecturl;
436: $url = &add_get_param($url, { 'symb' => $redirectsymb});
437: }
1.51 albertel 438: &Apache::loncommon::content_type($r,'text/html');
1.56 albertel 439: $r->header_out(Location => $url);
1.4 www 440: return REDIRECT;
1.5 www 441: } else {
442: # --------------------------------------------------------- There was a problem
1.51 albertel 443: &Apache::loncommon::content_type($r,'text/html');
1.8 www 444: $r->send_http_header;
1.59 www 445: my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
446: 'explain' =>
447: 'You have reached the end of the sequence of materials.',
448: 'back' => 'Go Back',
1.83 raeburn 449: 'nav' => 'Course Contents',
1.59 www 450: 'wherenext' =>
451: 'There are several possibilities of where to go next',
452: 'pick' =>
453: 'Please click on the the resource you intend to access',
454: 'titleheader' => 'Title',
455: 'type' => 'Type');
1.83 raeburn 456: if (&Apache::loncommon::course_type() eq 'Community') {
457: $lt{'nav'} = &mt('Community Contents');
458: }
1.8 www 459: if ($#possibilities>0) {
1.67 albertel 460: my $start_page=
461: &Apache::loncommon::start_page('Multiple Resources');
1.8 www 462: $r->print(<<ENDSTART);
1.67 albertel 463: $start_page
1.59 www 464: <h3>$lt{'wherenext'}</h3>
1.8 www 465: <p>
1.59 www 466: $lt{'pick'}:
1.8 www 467: <p>
1.79 bisitz 468: <table border="2">
1.59 www 469: <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
1.8 www 470: ENDSTART
1.62 albertel 471: foreach my $id (@possibilities) {
1.8 www 472: $r->print(
473: '<tr><td><a href="'.
1.66 albertel 474: &add_get_param($multichoicehash{'src_'.$id},
475: {'symb' =>
476: $multichoicehash{'symb_'.$id},
477: }).'">'.
1.62 albertel 478: $multichoicehash{'title_'.$id}.
479: '</a></td><td>'.$multichoicehash{'type_'.$id}.
1.8 www 480: '</td></tr>');
1.26 www 481: }
1.59 www 482: $r->print('</table>');
1.8 www 483: } else {
1.82 bisitz 484: $r->print(
485: &Apache::loncommon::start_page('No Resource')
486: .'<h2>'.$lt{'title'}.'</h2>'
487: .'<p>'.$lt{'explain'}.'</p>');
488: }
489: $r->print(
490: &Apache::lonhtmlcommon::actionbox(
491: ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
492: '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
493: ])
494: .&Apache::loncommon::end_page());
1.59 www 495: return OK;
496: }
1.5 www 497: } else {
498: # ------------------------------------------------- Problem, could not tie hash
1.53 albertel 499: $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
1.5 www 500: return HTTP_NOT_ACCEPTABLE;
1.3 www 501: }
1.5 www 502: } else {
503: # ---------------------------------------- No, could not determine where we are
1.42 albertel 504: $r->internal_redirect('/adm/ambiguous');
1.81 raeburn 505: return OK;
1.2 www 506: }
1.5 www 507: } else {
1.2 www 508: # -------------------------- Class was not initialized or page fliped strangely
1.53 albertel 509: $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
1.2 www 510: return HTTP_NOT_ACCEPTABLE;
511: }
1.1 www 512: }
513:
514: 1;
515: __END__
516:
1.77 jms 517: =pod
518:
519: =head1 NAME
520:
521: Apache::lonpageflip
522:
523: =head1 SYNOPSIS
524:
525: Deals with forward, backward, and other page flips.
526:
527: This is part of the LearningOnline Network with CAPA project
528: described at http://www.lon-capa.org.
529:
530: =head1 OVERVIEW
531:
532: (empty)
533:
534: =head1 SUBROUTINES
535:
536: =over cleanup()
537:
538: =item addrid()
539:
540: =item fullmove()
541:
542: =item hash_src()
543:
544: =item move()
545:
546: =item get_next_possible_move()
547:
548: =item first_accessible_resource()
549:
550: =item handler()
551:
552: =back
553:
554: =cut
1.1 www 555:
556:
557:
558:
559:
560:
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