1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.77 2004/04/26 19:16:45 www Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: package Apache::lonuserstate;
31:
32: # ------------------------------------------------- modules used by this module
33: use strict;
34: use Apache::Constants qw(:common :http);
35: use Apache::File;
36: use HTML::TokeParser;
37: use Apache::lonnet();
38: use Apache::loncommon();
39: use GDBM_File;
40: use Apache::lonmsg;
41: use Safe;
42: use Safe::Hole;
43: use Opcode;
44: use Apache::lonenc;
45:
46: # ---------------------------------------------------- Globals for this package
47:
48: my $pc; # Package counter
49: my %hash; # The big tied hash
50: my %parmhash;# The hash with the parameters
51: my @cond; # Array with all of the conditions
52: my $errtext; # variable with all errors
53: my $retfurl; # variable with the very first URL in the course
54: my %randompick; # randomly picked resources
55: my %randompickseed; # optional seed for randomly picking resources
56: my %encurl; # URLs in this folder are supposed to be encrypted
57: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
58:
59: # ----------------------------------- Remove version from URL and store in hash
60:
61: sub versiontrack {
62: my $uri=shift;
63: if ($uri=~/\.(\d+)\.\w+$/) {
64: my $version=$1;
65: $uri=~s/\.\d+\.(\w+)$/\.$1/;
66: unless ($hash{'version_'.$uri}) {
67: $hash{'version_'.$uri}=$version;
68: }
69: }
70: return $uri;
71: }
72:
73: # -------------------------------------------------------------- Put in version
74:
75: sub putinversion {
76: my $uri=shift;
77: if ($hash{'version_'.$uri}) {
78: my $version=$hash{'version_'.$uri};
79: if ($version eq 'mostrecent') { return $uri; }
80: if ($version eq &Apache::lonnet::getversion(
81: &Apache::lonnet::filelocation('',$uri)))
82: { return $uri; }
83: $uri=~s/\.(\w+)$/\.$version\.$1/;
84: }
85: return $uri;
86: }
87:
88: # ----------------------------------------- Processing versions file for course
89:
90: sub processversionfile {
91: my %cenv=@_;
92: my %versions=&Apache::lonnet::dump('resourceversions',
93: $cenv{'domain'},
94: $cenv{'num'});
95: foreach (keys %versions) {
96: if ($_=~/^error\:/) { return; }
97: $hash{'version_'.$_}=$versions{$_};
98: }
99: }
100:
101: # --------------------------------------------------------- Loads map from disk
102:
103: sub loadmap {
104: my $uri=shift;
105: if ($hash{'map_pc_'.$uri}) { return OK; }
106:
107: $pc++;
108: my $lpc=$pc;
109: $hash{'map_pc_'.$uri}=$lpc;
110: $hash{'map_id_'.$lpc}=$uri;
111:
112: # Determine and check filename
113: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
114:
115: my $ispage=($fn=~/\.page$/);
116:
117: unless (($fn=~/\.sequence$/) ||
118: ($fn=~/\.page$/)) {
119: $errtext.="Invalid map: $fn\n";
120: return OK;
121: }
122:
123: my $instr=&Apache::lonnet::getfile($fn);
124:
125: unless ($instr eq -1) {
126:
127: # Successfully got file, parse it
128:
129: my $parser = HTML::TokeParser->new(\$instr);
130: my $token;
131:
132: my $linkpc=0;
133:
134: $fn=~/\.(\w+)$/;
135:
136: $hash{'map_type_'.$lpc}=$1;
137:
138: while ($token = $parser->get_token) {
139: if ($token->[0] eq 'S') {
140: if ($token->[1] eq 'resource') {
141: # -------------------------------------------------------------------- Resource
142:
143: my $rid=$lpc.'.'.$token->[2]->{'id'};
144:
145: $hash{'kind_'.$rid}='res';
146: $hash{'title_'.$rid}=$token->[2]->{'title'};
147: my $turi=&versiontrack($token->[2]->{'src'});
148: if ($token->[2]->{'version'}) {
149: unless ($hash{'version_'.$turi}) {
150: $hash{'version_'.$turi}=$1;
151: }
152: }
153: &Apache::lonnet::do_cache(\%Apache::lonnet::titlecache,
154: &Apache::lonnet::encode_symb($uri,$token->[2]->{'id'},
155: $turi),
156: $token->[2]->{'title'},'title');
157: unless ($ispage) {
158: $turi=~/\.(\w+)$/;
159: my $embstyle=&Apache::loncommon::fileembstyle($1);
160: if ($token->[2]->{'external'} eq 'true') { # external
161: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
162: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
163: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
164: $turi='/adm/wrapper'.$turi;
165: } elsif ($turi!~/\.(sequence|page)$/) {
166: $turi='/adm/coursedocs/showdoc'.$turi;
167: }
168: } elsif ($turi=~/\S/) { # normal non-empty internal resource
169: my $mapdir=$uri;
170: $mapdir=~s/[^\/]+$//;
171: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
172: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
173: $turi='/adm/wrapper'.$turi;
174: }
175: }
176: }
177: # Store reverse lookup, remove query string
178: my $idsuri=$turi;
179: $idsuri=~s/\?.+$//;
180: if (defined($hash{'ids_'.$idsuri})) {
181: $hash{'ids_'.$idsuri}.=','.$rid;
182: } else {
183: $hash{'ids_'.$idsuri}=''.$rid;
184: }
185:
186: if
187: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
188: $turi.='?register=1';
189: }
190:
191: $hash{'src_'.$rid}=$turi;
192:
193: if ($token->[2]->{'external'} eq 'true') {
194: $hash{'ext_'.$rid}='true:';
195: } else {
196: $hash{'ext_'.$rid}='false:';
197: }
198: if ($token->[2]->{'type'}) {
199: $hash{'type_'.$rid}=$token->[2]->{'type'};
200: if ($token->[2]->{'type'} eq 'start') {
201: $hash{'map_start_'.$uri}="$rid";
202: }
203: if ($token->[2]->{'type'} eq 'finish') {
204: $hash{'map_finish_'.$uri}="$rid";
205: }
206: } else {
207: $hash{'type_'.$rid}='normal';
208: }
209:
210: if (($turi=~/\.sequence$/) ||
211: ($turi=~/\.page$/)) {
212: $hash{'is_map_'.$rid}=1;
213: &loadmap($turi);
214: }
215:
216: } elsif ($token->[1] eq 'condition') {
217: # ------------------------------------------------------------------- Condition
218:
219: my $rid=$lpc.'.'.$token->[2]->{'id'};
220:
221: $hash{'kind_'.$rid}='cond';
222: $cond[$#cond+1]=$token->[2]->{'value'};
223: $hash{'condid_'.$rid}=$#cond;
224: if ($token->[2]->{'type'}) {
225: $cond[$#cond].=':'.$token->[2]->{'type'};
226: } else {
227: $cond[$#cond].=':normal';
228: }
229:
230: } elsif ($token->[1] eq 'link') {
231: # ----------------------------------------------------------------------- Links
232:
233: $linkpc++;
234: my $linkid=$lpc.'.'.$linkpc;
235:
236: my $goesto=$lpc.'.'.$token->[2]->{'to'};
237: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
238: my $undercond=0;
239:
240: if ($token->[2]->{'condition'}) {
241: $undercond=$lpc.'.'.$token->[2]->{'condition'};
242: }
243:
244: $hash{'goesto_'.$linkid}=$goesto;
245: $hash{'comesfrom_'.$linkid}=$comesfrom;
246: $hash{'undercond_'.$linkid}=$undercond;
247:
248: if (defined($hash{'to_'.$comesfrom})) {
249: $hash{'to_'.$comesfrom}.=','.$linkid;
250: } else {
251: $hash{'to_'.$comesfrom}=''.$linkid;
252: }
253: if (defined($hash{'from_'.$goesto})) {
254: $hash{'from_'.$goesto}.=','.$linkid;
255: } else {
256: $hash{'from_'.$goesto}=''.$linkid;
257: }
258: } elsif ($token->[1] eq 'param') {
259: # ------------------------------------------------------------------- Parameter
260:
261: my $referid=$lpc.'.'.$token->[2]->{'to'};
262: my $name=$token->[2]->{'name'};
263: my $part;
264: if ($name=~/^parameter_(.*)_/) {
265: $part=$1;
266: } else {
267: $part=0;
268: }
269: $name=~s/^.*_([^_]*)$/$1/;
270: my $newparam=
271: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
272: &Apache::lonnet::escape($part.'.'.$name).'='.
273: &Apache::lonnet::escape($token->[2]->{'value'});
274: if (defined($hash{'param_'.$referid})) {
275: $hash{'param_'.$referid}.='&'.$newparam;
276: } else {
277: $hash{'param_'.$referid}=''.$newparam;
278: }
279: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
280: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
281: }
282: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
283: $randompick{$referid}=$token->[2]->{'value'};
284: }
285: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
286: $randompick{$referid}=$token->[2]->{'value'};
287: }
288: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
289: if ($token->[2]->{'value'}=~/^yes$/i) {
290: $encurl{$referid}=1;
291: }
292: }
293: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
294: if ($token->[2]->{'value'}=~/^yes$/i) {
295: $hiddenurl{$referid}=1;
296: }
297: }
298: }
299:
300: }
301: }
302:
303: } else {
304: $errtext.='Map not loaded: The file does not exist. ';
305: }
306: }
307:
308: # --------------------------------------------------------- Simplify expression
309:
310: sub simplify {
311: my $expression=shift;
312: # (8)=8
313: $expression=~s/\((\d+)\)/$1/g;
314: # 8&8=8
315: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
316: # 8|8=8
317: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
318: # (5&3)&4=5&3&4
319: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
320: # (((5&3)|(4&6)))=((5&3)|(4&6))
321: $expression=~
322: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
323: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
324: $expression=~
325: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
326: return $expression;
327: }
328:
329: # -------------------------------------------------------- Build condition hash
330:
331: sub traceroute {
332: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
333: $sofar=simplify($sofar);
334: unless ($beenhere=~/\&$rid\&/) {
335: $beenhere.=$rid.'&';
336: if ($hdnflag) {
337: $hiddenurl{$rid}=1;
338: }
339: if ($encflag) {
340: $encurl{$rid}=1;
341: }
342: if (($retfurl eq '') && ($hash{'src_'.$rid})
343: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
344: my ($mapid,$resid)=split(/\./,$rid);
345: $retfurl=$hash{'src_'.$rid}.
346: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
347: &Apache::lonnet::symbclean(
348: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
349: '___'.$resid.'___'.
350: &Apache::lonnet::declutter($hash{'src_'.$rid}));
351: }
352: if (defined($hash{'conditions_'.$rid})) {
353: $hash{'conditions_'.$rid}=simplify(
354: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
355: } else {
356: $hash{'conditions_'.$rid}=$sofar;
357: }
358: if (defined($hash{'is_map_'.$rid})) {
359: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
360: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&',
361: $encflag || $encurl{$rid},
362: $hdnflag || $hiddenurl{$rid});
363: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
364: $sofar=
365: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
366: }
367: }
368: }
369: if (defined($hash{'to_'.$rid})) {
370: foreach (split(/\,/,$hash{'to_'.$rid})) {
371: my $further=$sofar;
372: if ($hash{'undercond_'.$_}) {
373: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
374: $further=simplify('('.$further.')&('.
375: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
376: } else {
377: $errtext.='Undefined condition ID: '
378: .$hash{'undercond_'.$_}.'. ';
379: }
380: }
381: &traceroute($further,$hash{'goesto_'.$_},$beenhere,$encflag,$hdnflag);
382: }
383: }
384: }
385: }
386:
387: # ------------------------------ Cascading conditions, quick access, parameters
388:
389: sub accinit {
390: my ($uri,$short,$fn)=@_;
391: my %acchash=();
392: my %captured=();
393: my $condcounter=0;
394: $acchash{'acc.cond.'.$short.'.0'}=0;
395: foreach (keys %hash) {
396: if ($_=~/^conditions/) {
397: my $expr=$hash{$_};
398: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
399: my $sub=$_;
400: my $orig=$_;
401: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
402: my $factor=$1;
403: $sub=~s/$factor//g;
404: $sub=~s/^\(/\($factor\(/;
405: $sub.=')';
406: $sub=simplify($sub);
407: $orig=~s/(\W)/\\$1/g;
408: $expr=~s/$orig/$sub/;
409: }
410: $hash{$_}=$expr;
411: unless (defined($captured{$expr})) {
412: $condcounter++;
413: $captured{$expr}=$condcounter;
414: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
415: }
416: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
417: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}).
418: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
419: foreach (split(/\&/,$hash{$_})) {
420: my ($typename,$value)=split(/\=/,$_);
421: my ($type,$name)=split(/\:/,$typename);
422: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
423: &Apache::lonnet::unescape($value);
424: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
425: &Apache::lonnet::unescape($type);
426: }
427: }
428: }
429: foreach (keys %hash) {
430: if ($_=~/^ids/) {
431: foreach (split(/\,/,$hash{$_})) {
432: my $resid=$_;
433: my $uri=$hash{'src_'.$resid};
434: $uri=~s/^\/adm\/wrapper//;
435: $uri=&Apache::lonnet::declutter($uri);
436: my @uriparts=split(/\//,$uri);
437: my $urifile=$uriparts[$#uriparts];
438: $#uriparts--;
439: my $uripath=join('/',@uriparts);
440: if ($uripath) {
441: my $uricond='0';
442: if (defined($hash{'conditions_'.$resid})) {
443: $uricond=$captured{$hash{'conditions_'.$resid}};
444: }
445: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
446: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
447: /(\&\Q$urifile\E\:[^\&]*)/) {
448: my $replace=$1;
449: my $regexp=$replace;
450: $regexp=~s/\|/\\\|/g;
451: $acchash{'acc.res.'.$short.'.'.$uripath}
452: =~s/$regexp/$replace\|$uricond/;
453: } else {
454: $acchash{'acc.res.'.$short.'.'.$uripath}.=
455: $urifile.':'.$uricond.'&';
456: }
457: } else {
458: $acchash{'acc.res.'.$short.'.'.$uripath}=
459: '&'.$urifile.':'.$uricond.'&';
460: }
461: }
462: }
463: }
464: }
465: $acchash{'acc.res.'.$short.'.'}='&:0&';
466: my $courseuri=$uri;
467: $courseuri=~s/^\/res\///;
468: &Apache::lonnet::delenv('(acc\.|httpref\.)');
469: &Apache::lonnet::appenv(%acchash,
470: "request.course.id" => $short,
471: "request.course.fn" => $fn,
472: "request.course.uri" => $courseuri);
473: }
474:
475: # ---------------- Selectively delete from randompick maps and hidden url parms
476:
477: sub hiddenurls {
478: my $randomoutentry='';
479: foreach my $rid (keys %randompick) {
480: my $rndpick=$randompick{$rid};
481: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
482: # ------------------------------------------- put existing resources into array
483: my @currentrids=();
484: foreach (sort(keys(%hash))) {
485: if ($_=~/^src_($mpc\.\d+)/) {
486: if ($hash{'src_'.$1}) { push @currentrids, $1; }
487: }
488: }
489: # rids are number.number and we want to numercially sort on
490: # the second number
491: @currentrids=sort {
492: my (undef,$aid)=split(/\./,$a);
493: my (undef,$bid)=split(/\./,$b);
494: $aid <=> $bid;
495: } @currentrids;
496: next if ($#currentrids<$rndpick);
497: # -------------------------------- randomly eliminate the ones that should stay
498: my (undef,$id)=split(/\./,$rid);
499: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
500: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
501: &Apache::lonnet::setup_random_from_rndseed($rndseed);
502: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
503: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
504: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
505: # -------------------------------------------------------- delete the leftovers
506: for (my $k=0; $k<=$#currentrids; $k++) {
507: if ($currentrids[$k]) {
508: $hash{'randomout_'.$currentrids[$k]}=1;
509: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
510: $randomoutentry.='&'.
511: &Apache::lonnet::symbclean(
512: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
513: '___'.$resid.'___'.
514: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]})
515: ).'&';
516: }
517: }
518: }
519: # ------------------------------ take care of explicitly hidden urls or folders
520: foreach my $rid (keys %hiddenurl) {
521: $hash{'randomout_'.$rid}=1;
522: my ($mapid,$resid)=split(/\./,$rid);
523: $randomoutentry.='&'.
524: &Apache::lonnet::symbclean(
525: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
526: '___'.$resid.'___'.
527: &Apache::lonnet::declutter($hash{'src_'.$rid})
528: ).'&';
529: }
530: # --------------------------------------- append randomout entry to environment
531: if ($randomoutentry) {
532: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
533: }
534: }
535:
536: # ---------------------------------------------------- Read map and all submaps
537:
538: sub readmap {
539: my $short=shift;
540: $short=~s/^\///;
541: my %cenv=&Apache::lonnet::coursedescription($short);
542: my $fn=$cenv{'fn'};
543: my $uri;
544: $short=~s/\//\_/g;
545: unless ($uri=$cenv{'url'}) {
546: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
547: "Could not load course $short.</font>");
548: return 'No course data available.';
549: }
550: @cond=('true:normal');
551: unlink($fn.'.db');
552: unlink($fn.'_symb.db');
553: unlink($fn.'.state');
554: unlink($fn.'parms.db');
555: undef %randompick;
556: undef %hiddenurl;
557: undef %encurl;
558: $retfurl='';
559: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
560: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
561: %hash=();
562: %parmhash=();
563: $errtext='';
564: $pc=0;
565: &processversionfile(%cenv);
566: my $furi=&Apache::lonnet::clutter($uri);
567: $hash{'src_0.0'}=&versiontrack($furi);
568: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
569: $hash{'ids_'.$furi}='0.0';
570: $hash{'is_map_0.0'}=1;
571: loadmap($uri);
572: if (defined($hash{'map_start_'.$uri})) {
573: &traceroute('0',$hash{'map_start_'.$uri},'&');
574: &accinit($uri,$short,$fn);
575: &hiddenurls();
576: }
577: # ------------------------------------------------------- Put versions into src
578: foreach (keys %hash) {
579: if ($_=~/^src\_/) {
580: $hash{$_}=&putinversion($hash{$_});
581: }
582: }
583: # ---------------------------------------------------------------- Encrypt URLs
584: foreach (keys %encurl) {
585: $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
586: }
587: # ----------------------------------------------- Close hashes to finally store
588: # --------------------------------- Routine must pass this point, no early outs
589: unless ((untie(%hash)) && (untie(%parmhash))) {
590: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
591: "Could not untie coursemap $fn for $uri.</font>");
592: }
593: # ---------------------------------------------------- Store away initial state
594: {
595: my $cfh;
596: if ($cfh=Apache::File->new(">$fn.state")) {
597: print $cfh join("\n",@cond);
598: } else {
599: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
600: "Could not write statemap $fn for $uri.</font>");
601: }
602: }
603: } else {
604: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
605: "Could not tie coursemap $fn for $uri.</font>");
606: }
607: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext);
608: # ------------------------------------------------- Check for critical messages
609:
610: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'},
611: $ENV{'user.name'});
612: if ($what[0]) {
613: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
614: $retfurl='/adm/email?critical=display';
615: }
616: }
617: return ($retfurl,$errtext);
618: }
619:
620: # ------------------------------------------------------- Evaluate state string
621:
622: sub evalstate {
623:
624: my $fn=$ENV{'request.course.fn'}.'.state';
625: my $state='2';
626: if (-e $fn) {
627: my @conditions=();
628: {
629: my $fh=Apache::File->new($fn);
630: @conditions=<$fh>;
631: }
632: my $safeeval = new Safe;
633: my $safehole = new Safe::Hole;
634: $safeeval->permit("entereval");
635: $safeeval->permit(":base_math");
636: $safeeval->deny(":base_io");
637: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
638: foreach (@conditions) {
639: my $line=$_;
640: chomp($line);
641: my ($condition,$weight)=split(/\:/,$_);
642: if ($safeeval->reval($condition)) {
643: if ($weight eq 'force') {
644: $state.='3';
645: } else {
646: $state.='2';
647: }
648: } else {
649: if ($weight eq 'stop') {
650: $state.='0';
651: } else {
652: $state.='1';
653: }
654: }
655: }
656: }
657: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
658: return $state;
659: }
660:
661: 1;
662: __END__
663:
664: =head1 NAME
665:
666: Apache::lonuserstate - Construct and maintain state and binary representation
667: of course for user
668:
669: =head1 SYNOPSIS
670:
671: Invoked by lonroles.pm.
672:
673: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
674:
675: =head1 INTRODUCTION
676:
677: This module constructs and maintains state and binary representation
678: of course for user.
679:
680: This is part of the LearningOnline Network with CAPA project
681: described at http://www.lon-capa.org.
682:
683: =head1 HANDLER SUBROUTINE
684:
685: There is no handler subroutine.
686:
687: =head1 OTHER SUBROUTINES
688:
689: =over 4
690:
691: =item *
692:
693: loadmap() : Loads map from disk
694:
695: =item *
696:
697: simplify() : Simplify expression
698:
699: =item *
700:
701: traceroute() : Build condition hash
702:
703: =item *
704:
705: accinit() : Cascading conditions, quick access, parameters
706:
707: =item *
708:
709: readmap() : Read map and all submaps
710:
711: =item *
712:
713: evalstate() : Evaluate state string
714:
715: =back
716:
717: =cut
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