1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.96 2005/09/23 21:39:09 albertel 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 HTML::TokeParser;
36: use Apache::lonnet;
37: use Apache::loncommon();
38: use GDBM_File;
39: use Apache::lonmsg;
40: use Safe;
41: use Safe::Hole;
42: use Opcode;
43: use Apache::lonenc;
44: use Fcntl qw(:flock);
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: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
78: if ($hash{'version_'.$uri}) {
79: my $version=$hash{'version_'.$uri};
80: if ($version eq 'mostrecent') { return $uri; }
81: if ($version eq &Apache::lonnet::getversion(
82: &Apache::lonnet::filelocation('',$uri)))
83: { return $uri; }
84: $uri=~s/\.(\w+)$/\.$version\.$1/;
85: }
86: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
87: return $uri;
88: }
89:
90: # ----------------------------------------- Processing versions file for course
91:
92: sub processversionfile {
93: my %cenv=@_;
94: my %versions=&Apache::lonnet::dump('resourceversions',
95: $cenv{'domain'},
96: $cenv{'num'});
97: foreach (keys %versions) {
98: if ($_=~/^error\:/) { return; }
99: $hash{'version_'.$_}=$versions{$_};
100: }
101: }
102:
103: # --------------------------------------------------------- Loads map from disk
104:
105: sub loadmap {
106: my $uri=shift;
107: if ($hash{'map_pc_'.$uri}) { return OK; }
108:
109: $pc++;
110: my $lpc=$pc;
111: $hash{'map_pc_'.$uri}=$lpc;
112: $hash{'map_id_'.$lpc}=$uri;
113:
114: # Determine and check filename
115: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
116:
117: my $ispage=($fn=~/\.page$/);
118:
119: unless (($fn=~/\.sequence$/) ||
120: ($fn=~/\.page$/)) {
121: $errtext.="Invalid map: $fn\n";
122: return OK;
123: }
124:
125: my $instr=&Apache::lonnet::getfile($fn);
126:
127: unless ($instr eq -1) {
128:
129: # Successfully got file, parse it
130:
131: my $parser = HTML::TokeParser->new(\$instr);
132: $parser->attr_encoded(1);
133: my $token;
134:
135: my $linkpc=0;
136:
137: $fn=~/\.(\w+)$/;
138:
139: $hash{'map_type_'.$lpc}=$1;
140:
141: while ($token = $parser->get_token) {
142: if ($token->[0] eq 'S') {
143: if ($token->[1] eq 'resource') {
144: # -------------------------------------------------------------------- Resource
145: if ($token->[2]->{'type'} eq 'zombie') { next; }
146: my $rid=$lpc.'.'.$token->[2]->{'id'};
147:
148: $hash{'kind_'.$rid}='res';
149: $hash{'title_'.$rid}=$token->[2]->{'title'};
150: my $turi=&versiontrack($token->[2]->{'src'});
151: if ($token->[2]->{'version'}) {
152: unless ($hash{'version_'.$turi}) {
153: $hash{'version_'.$turi}=$1;
154: }
155: }
156: my $title=$token->[2]->{'title'};
157: $title=~s/\&colon\;/\:/gs;
158: # my $symb=&Apache::lonnet::encode_symb($uri,
159: # $token->[2]->{'id'},
160: # $turi);
161: # &Apache::lonnet::do_cache_new('title',$symb,$title);
162: unless ($ispage) {
163: $turi=~/\.(\w+)$/;
164: my $embstyle=&Apache::loncommon::fileembstyle($1);
165: if ($token->[2]->{'external'} eq 'true') { # external
166: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
167: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
168: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
169: $turi='/adm/wrapper'.$turi;
170: } elsif ($embstyle eq 'ssi') {
171: #do nothing with these
172: } elsif ($turi!~/\.(sequence|page)$/) {
173: $turi='/adm/coursedocs/showdoc'.$turi;
174: }
175: } elsif ($turi=~/\S/) { # normal non-empty internal resource
176: my $mapdir=$uri;
177: $mapdir=~s/[^\/]+$//;
178: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
179: if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
180: $turi='/adm/wrapper'.$turi;
181: }
182: }
183: }
184: # Store reverse lookup, remove query string
185: my $idsuri=$turi;
186: $idsuri=~s/\?.+$//;
187: if (defined($hash{'ids_'.$idsuri})) {
188: $hash{'ids_'.$idsuri}.=','.$rid;
189: } else {
190: $hash{'ids_'.$idsuri}=''.$rid;
191: }
192:
193: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
194: $turi.='?register=1';
195: }
196:
197: $hash{'src_'.$rid}=$turi;
198:
199: if ($token->[2]->{'external'} eq 'true') {
200: $hash{'ext_'.$rid}='true:';
201: } else {
202: $hash{'ext_'.$rid}='false:';
203: }
204: if ($token->[2]->{'type'}) {
205: $hash{'type_'.$rid}=$token->[2]->{'type'};
206: if ($token->[2]->{'type'} eq 'start') {
207: $hash{'map_start_'.$uri}="$rid";
208: }
209: if ($token->[2]->{'type'} eq 'finish') {
210: $hash{'map_finish_'.$uri}="$rid";
211: }
212: } else {
213: $hash{'type_'.$rid}='normal';
214: }
215:
216: if (($turi=~/\.sequence$/) ||
217: ($turi=~/\.page$/)) {
218: $hash{'is_map_'.$rid}=1;
219: &loadmap($turi);
220: }
221:
222: } elsif ($token->[1] eq 'condition') {
223: # ------------------------------------------------------------------- Condition
224:
225: my $rid=$lpc.'.'.$token->[2]->{'id'};
226:
227: $hash{'kind_'.$rid}='cond';
228: $cond[$#cond+1]=$token->[2]->{'value'};
229: $hash{'condid_'.$rid}=$#cond;
230: if ($token->[2]->{'type'}) {
231: $cond[$#cond].=':'.$token->[2]->{'type'};
232: } else {
233: $cond[$#cond].=':normal';
234: }
235:
236: } elsif ($token->[1] eq 'link') {
237: # ----------------------------------------------------------------------- Links
238:
239: $linkpc++;
240: my $linkid=$lpc.'.'.$linkpc;
241:
242: my $goesto=$lpc.'.'.$token->[2]->{'to'};
243: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
244: my $undercond=0;
245:
246: if ($token->[2]->{'condition'}) {
247: $undercond=$lpc.'.'.$token->[2]->{'condition'};
248: }
249:
250: $hash{'goesto_'.$linkid}=$goesto;
251: $hash{'comesfrom_'.$linkid}=$comesfrom;
252: $hash{'undercond_'.$linkid}=$undercond;
253:
254: if (defined($hash{'to_'.$comesfrom})) {
255: $hash{'to_'.$comesfrom}.=','.$linkid;
256: } else {
257: $hash{'to_'.$comesfrom}=''.$linkid;
258: }
259: if (defined($hash{'from_'.$goesto})) {
260: $hash{'from_'.$goesto}.=','.$linkid;
261: } else {
262: $hash{'from_'.$goesto}=''.$linkid;
263: }
264: } elsif ($token->[1] eq 'param') {
265: # ------------------------------------------------------------------- Parameter
266:
267: my $referid=$lpc.'.'.$token->[2]->{'to'};
268: my $name=$token->[2]->{'name'};
269: my $part;
270: if ($name=~/^parameter_(.*)_/) {
271: $part=$1;
272: } else {
273: $part=0;
274: }
275: $name=~s/^.*_([^_]*)$/$1/;
276: my $newparam=
277: &Apache::lonnet::escape($token->[2]->{'type'}).':'.
278: &Apache::lonnet::escape($part.'.'.$name).'='.
279: &Apache::lonnet::escape($token->[2]->{'value'});
280: if (defined($hash{'param_'.$referid})) {
281: $hash{'param_'.$referid}.='&'.$newparam;
282: } else {
283: $hash{'param_'.$referid}=''.$newparam;
284: }
285: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
286: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
287: }
288: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
289: $randompick{$referid}=$token->[2]->{'value'};
290: }
291: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
292: $randompick{$referid}=$token->[2]->{'value'};
293: }
294: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
295: if ($token->[2]->{'value'}=~/^yes$/i) {
296: $encurl{$referid}=1;
297: }
298: }
299: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
300: if ($token->[2]->{'value'}=~/^yes$/i) {
301: $hiddenurl{$referid}=1;
302: }
303: }
304: }
305:
306: }
307: }
308:
309: } else {
310: $errtext.='Map not loaded: The file ('.$fn.') does not exist. ';
311: }
312: }
313:
314: # --------------------------------------------------------- Simplify expression
315:
316: sub simplify {
317: my $expression=shift;
318: # (8)=8
319: $expression=~s/\((\d+)\)/$1/g;
320: # 8&8=8
321: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g;
322: # 8|8=8
323: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g;
324: # (5&3)&4=5&3&4
325: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g;
326: # (((5&3)|(4&6)))=((5&3)|(4&6))
327: $expression=~
328: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g;
329: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
330: $expression=~
331: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g;
332: return $expression;
333: }
334:
335: # -------------------------------------------------------- Build condition hash
336:
337: sub traceroute {
338: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
339: my $newsofar=$sofar=simplify($sofar);
340: unless ($beenhere=~/\&$rid\&/) {
341: $beenhere.=$rid.'&';
342: my ($mapid,$resid)=split(/\./,$rid);
343: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
344: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
345:
346: if ($hdnflag || lc($hidden) eq 'yes') {
347: $hiddenurl{$rid}=1;
348: }
349: if (!$hdnflag && lc($hidden) eq 'no') {
350: delete($hiddenurl{$rid});
351: }
352:
353: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
354: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
355: if (($retfurl eq '') && ($hash{'src_'.$rid})
356: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
357: $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
358: 'symb='.$symb;
359: }
360: if (defined($hash{'conditions_'.$rid})) {
361: $hash{'conditions_'.$rid}=simplify(
362: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
363: } else {
364: $hash{'conditions_'.$rid}=$sofar;
365: }
366: $newsofar=$hash{'conditions_'.$rid};
367: if (defined($hash{'is_map_'.$rid})) {
368: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
369: $sofar=$newsofar=
370: &traceroute($sofar,
371: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
372: $encflag || $encurl{$rid},
373: $hdnflag || $hiddenurl{$rid});
374: }
375: }
376: if (defined($hash{'to_'.$rid})) {
377: foreach (split(/\,/,$hash{'to_'.$rid})) {
378: my $further=$sofar;
379: if ($hash{'undercond_'.$_}) {
380: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) {
381: $further=simplify('('.$further.')&('.
382: $hash{'condid_'.$hash{'undercond_'.$_}}.')');
383: } else {
384: $errtext.='Undefined condition ID: '
385: .$hash{'undercond_'.$_}.'. ';
386: }
387: }
388: $newsofar=&traceroute($further,$hash{'goesto_'.$_},$beenhere,
389: $encflag,$hdnflag);
390: }
391: }
392: }
393: return $newsofar;
394: }
395:
396: # ------------------------------ Cascading conditions, quick access, parameters
397:
398: sub accinit {
399: my ($uri,$short,$fn)=@_;
400: my %acchash=();
401: my %captured=();
402: my $condcounter=0;
403: $acchash{'acc.cond.'.$short.'.0'}=0;
404: foreach (keys %hash) {
405: if ($_=~/^conditions/) {
406: my $expr=$hash{$_};
407: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) {
408: my $sub=$_;
409: my $orig=$_;
410: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/;
411: my $factor=$1;
412: $sub=~s/$factor//g;
413: $sub=~s/^\(/\($factor\(/;
414: $sub.=')';
415: $sub=simplify($sub);
416: $orig=~s/(\W)/\\$1/g;
417: $expr=~s/$orig/$sub/;
418: }
419: $hash{$_}=$expr;
420: unless (defined($captured{$expr})) {
421: $condcounter++;
422: $captured{$expr}=$condcounter;
423: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
424: }
425: } elsif ($_=~/^param_(\d+)\.(\d+)/) {
426: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
427: $hash{'src_'.$1.'.'.$2});
428: foreach (split(/\&/,$hash{$_})) {
429: my ($typename,$value)=split(/\=/,$_);
430: my ($type,$name)=split(/\:/,$typename);
431: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}=
432: &Apache::lonnet::unescape($value);
433: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}=
434: &Apache::lonnet::unescape($type);
435: }
436: }
437: }
438: foreach (keys %hash) {
439: if ($_=~/^ids/) {
440: foreach (split(/\,/,$hash{$_})) {
441: my $resid=$_;
442: my $uri=$hash{'src_'.$resid};
443: $uri=~s/^\/adm\/wrapper//;
444: $uri=&Apache::lonnet::declutter($uri);
445: my @uriparts=split(/\//,$uri);
446: my $urifile=$uriparts[$#uriparts];
447: $#uriparts--;
448: my $uripath=join('/',@uriparts);
449: if ($uripath) {
450: my $uricond='0';
451: if (defined($hash{'conditions_'.$resid})) {
452: $uricond=$captured{$hash{'conditions_'.$resid}};
453: }
454: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
455: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
456: /(\&\Q$urifile\E\:[^\&]*)/) {
457: my $replace=$1;
458: my $regexp=$replace;
459: #$regexp=~s/\|/\\\|/g;
460: $acchash{'acc.res.'.$short.'.'.$uripath}
461: =~s/\Q$regexp\E/$replace\|$uricond/;
462: } else {
463: $acchash{'acc.res.'.$short.'.'.$uripath}.=
464: $urifile.':'.$uricond.'&';
465: }
466: } else {
467: $acchash{'acc.res.'.$short.'.'.$uripath}=
468: '&'.$urifile.':'.$uricond.'&';
469: }
470: }
471: }
472: }
473: }
474: $acchash{'acc.res.'.$short.'.'}='&:0&';
475: my $courseuri=$uri;
476: $courseuri=~s/^\/res\///;
477: &Apache::lonnet::delenv('(acc\.|httpref\.)');
478: &Apache::lonnet::appenv(%acchash);
479: }
480:
481: # ---------------- Selectively delete from randompick maps and hidden url parms
482:
483: sub hiddenurls {
484: my $randomoutentry='';
485: foreach my $rid (keys %randompick) {
486: my $rndpick=$randompick{$rid};
487: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
488: # ------------------------------------------- put existing resources into array
489: my @currentrids=();
490: foreach (sort(keys(%hash))) {
491: if ($_=~/^src_($mpc\.\d+)/) {
492: if ($hash{'src_'.$1}) { push @currentrids, $1; }
493: }
494: }
495: # rids are number.number and we want to numercially sort on
496: # the second number
497: @currentrids=sort {
498: my (undef,$aid)=split(/\./,$a);
499: my (undef,$bid)=split(/\./,$b);
500: $aid <=> $bid;
501: } @currentrids;
502: next if ($#currentrids<$rndpick);
503: # -------------------------------- randomly eliminate the ones that should stay
504: my (undef,$id)=split(/\./,$rid);
505: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
506: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
507: &Apache::lonnet::setup_random_from_rndseed($rndseed);
508: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
509: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
510: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
511: # -------------------------------------------------------- delete the leftovers
512: for (my $k=0; $k<=$#currentrids; $k++) {
513: if ($currentrids[$k]) {
514: $hash{'randomout_'.$currentrids[$k]}=1;
515: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
516: $randomoutentry.='&'.
517: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
518: $resid,
519: $hash{'src_'.$currentrids[$k]}
520: ).'&';
521: }
522: }
523: }
524: # ------------------------------ take care of explicitly hidden urls or folders
525: foreach my $rid (keys %hiddenurl) {
526: $hash{'randomout_'.$rid}=1;
527: my ($mapid,$resid)=split(/\./,$rid);
528: $randomoutentry.='&'.
529: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
530: $hash{'src_'.$rid}).'&';
531: }
532: # --------------------------------------- append randomout entry to environment
533: if ($randomoutentry) {
534: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
535: }
536: }
537:
538: # ---------------------------------------------------- Read map and all submaps
539:
540: sub readmap {
541: my $short=shift;
542: $short=~s/^\///;
543: my %cenv=&Apache::lonnet::coursedescription($short);
544: my $fn=$cenv{'fn'};
545: my $uri;
546: $short=~s/\//\_/g;
547: unless ($uri=$cenv{'url'}) {
548: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
549: "Could not load course $short.</font>");
550: return 'No course data available.';
551: }
552: @cond=('true:normal');
553:
554: open(LOCKFILE,">$fn.db.lock");
555: my $lock=0;
556: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
557: $lock=1;
558: unlink($fn.'.db');
559: unlink($fn.'_symb.db');
560: unlink($fn.'.state');
561: unlink($fn.'parms.db');
562: }
563: undef %randompick;
564: undef %hiddenurl;
565: undef %encurl;
566: $retfurl='';
567: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
568: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
569: %hash=();
570: %parmhash=();
571: $errtext='';
572: $pc=0;
573: &processversionfile(%cenv);
574: my $furi=&Apache::lonnet::clutter($uri);
575: $hash{'src_0.0'}=&versiontrack($furi);
576: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
577: $hash{'ids_'.$furi}='0.0';
578: $hash{'is_map_0.0'}=1;
579: loadmap($uri);
580: if (defined($hash{'map_start_'.$uri})) {
581: &Apache::lonnet::appenv("request.course.id" => $short,
582: "request.course.fn" => $fn,
583: "request.course.uri" => $uri);
584: &traceroute('0',$hash{'map_start_'.$uri},'&');
585: &accinit($uri,$short,$fn);
586: &hiddenurls();
587: }
588: # ------------------------------------------------------- Put versions into src
589: foreach (keys %hash) {
590: if ($_=~/^src\_/) {
591: $hash{$_}=&putinversion($hash{$_});
592: }
593: }
594: # ---------------------------------------------------------------- Encrypt URLs
595: foreach (keys %encurl) {
596: # $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
597: $hash{'encrypted_'.$_}=1;
598: }
599: # ----------------------------------------------- Close hashes to finally store
600: # --------------------------------- Routine must pass this point, no early outs
601: $hash{'first_url'}=$retfurl;
602: unless ((untie(%hash)) && (untie(%parmhash))) {
603: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
604: "Could not untie coursemap $fn for $uri.</font>");
605: }
606: # ---------------------------------------------------- Store away initial state
607: {
608: my $cfh;
609: if (open($cfh,">$fn.state")) {
610: print $cfh join("\n",@cond);
611: } else {
612: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
613: "Could not write statemap $fn for $uri.</font>");
614: }
615: }
616: flock(LOCKFILE,LOCK_UN);
617: close(LOCKFILE);
618: } else {
619: # if we are here it is likely because we are already trying to
620: # initialize the course in another child, busy wait trying to
621: # tie the hashes for the next 90 seconds, if we succeed forward
622: # them on to navmaps, if we fail, throw up the Could not init
623: # course screen
624: if ($lock) {
625: # Got the lock but not the DB files
626: flock(LOCKFILE,LOCK_UN);
627: }
628: untie(%hash);
629: untie(%parmhash);
630: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
631: "Could not tie coursemap $fn for $uri.</font>");
632: my $i=0;
633: while($i<90) {
634: $i++;
635: sleep(1);
636: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
637: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
638: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
639: $retfurl='/adm/navmaps';
640: &Apache::lonnet::appenv("request.course.id" => $short,
641: "request.course.fn" => $fn,
642: "request.course.uri" => $uri);
643: untie(%hash);
644: untie(%parmhash);
645: last;
646: }
647: }
648: untie(%hash);
649: untie(%parmhash);
650: }
651: flock(LOCKFILE,LOCK_UN);
652: close(LOCKFILE);
653: }
654: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
655: # ------------------------------------------------- Check for critical messages
656:
657: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
658: $env{'user.name'});
659: if ($what[0]) {
660: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
661: $retfurl='/adm/email?critical=display';
662: }
663: }
664: return ($retfurl,$errtext);
665: }
666:
667: # ------------------------------------------------------- Evaluate state string
668:
669: sub evalstate {
670: my $fn=$env{'request.course.fn'}.'.state';
671: my $state='';
672: if (-e $fn) {
673: my @conditions=();
674: {
675: my $fh=Apache::File->new($fn);
676: @conditions=<$fh>;
677: }
678: my $safeeval = new Safe;
679: my $safehole = new Safe::Hole;
680: $safeeval->permit("entereval");
681: $safeeval->permit(":base_math");
682: $safeeval->deny(":base_io");
683: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
684: foreach my $line (@conditions) {
685: chomp($line);
686: my ($condition,$weight)=split(/\:/,$line);
687: if ($safeeval->reval($condition)) {
688: if ($weight eq 'force') {
689: $state.='3';
690: } else {
691: $state.='2';
692: }
693: } else {
694: if ($weight eq 'stop') {
695: $state.='0';
696: } else {
697: $state.='1';
698: }
699: }
700: }
701: }
702: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
703: return $state;
704: }
705:
706: 1;
707: __END__
708:
709: =head1 NAME
710:
711: Apache::lonuserstate - Construct and maintain state and binary representation
712: of course for user
713:
714: =head1 SYNOPSIS
715:
716: Invoked by lonroles.pm.
717:
718: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
719:
720: =head1 INTRODUCTION
721:
722: This module constructs and maintains state and binary representation
723: of course for user.
724:
725: This is part of the LearningOnline Network with CAPA project
726: described at http://www.lon-capa.org.
727:
728: =head1 HANDLER SUBROUTINE
729:
730: There is no handler subroutine.
731:
732: =head1 OTHER SUBROUTINES
733:
734: =over 4
735:
736: =item *
737:
738: loadmap() : Loads map from disk
739:
740: =item *
741:
742: simplify() : Simplify expression
743:
744: =item *
745:
746: traceroute() : Build condition hash
747:
748: =item *
749:
750: accinit() : Cascading conditions, quick access, parameters
751:
752: =item *
753:
754: readmap() : Read map and all submaps
755:
756: =item *
757:
758: evalstate() : Evaluate state string
759:
760: =back
761:
762: =cut
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