1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.123 2007/08/28 16:45:20 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 HTML::TokeParser;
35: use Apache::lonnet;
36: use Apache::lonlocal;
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: use LONCAPA;
46:
47:
48: # ---------------------------------------------------- Globals for this package
49:
50: my $pc; # Package counter
51: my %hash; # The big tied hash
52: my %parmhash;# The hash with the parameters
53: my @cond; # Array with all of the conditions
54: my $errtext; # variable with all errors
55: my $retfrid; # variable with the very first RID in the course
56: my $retfurl; # first URL
57: my %randompick; # randomly picked resources
58: my %randompickseed; # optional seed for randomly picking resources
59: my %encurl; # URLs in this folder are supposed to be encrypted
60: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
61:
62: # ----------------------------------- Remove version from URL and store in hash
63:
64: sub versiontrack {
65: my $uri=shift;
66: if ($uri=~/\.(\d+)\.\w+$/) {
67: my $version=$1;
68: $uri=~s/\.\d+\.(\w+)$/\.$1/;
69: unless ($hash{'version_'.$uri}) {
70: $hash{'version_'.$uri}=$version;
71: }
72: }
73: return $uri;
74: }
75:
76: # -------------------------------------------------------------- Put in version
77:
78: sub putinversion {
79: my $uri=shift;
80: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
81: if ($hash{'version_'.$uri}) {
82: my $version=$hash{'version_'.$uri};
83: if ($version eq 'mostrecent') { return $uri; }
84: if ($version eq &Apache::lonnet::getversion(
85: &Apache::lonnet::filelocation('',$uri)))
86: { return $uri; }
87: $uri=~s/\.(\w+)$/\.$version\.$1/;
88: }
89: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
90: return $uri;
91: }
92:
93: # ----------------------------------------- Processing versions file for course
94:
95: sub processversionfile {
96: my %cenv=@_;
97: my %versions=&Apache::lonnet::dump('resourceversions',
98: $cenv{'domain'},
99: $cenv{'num'});
100: foreach my $ver (keys(%versions)) {
101: if ($ver=~/^error\:/) { return; }
102: $hash{'version_'.$ver}=$versions{$ver};
103: }
104: }
105:
106: # --------------------------------------------------------- Loads map from disk
107:
108: sub loadmap {
109: my $uri=shift;
110: if ($hash{'map_pc_'.$uri}) {
111: $errtext.='<p class="LC_error">'.
112: &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
113: '</p>';
114: return;
115: }
116: $pc++;
117: my $lpc=$pc;
118: $hash{'map_pc_'.$uri}=$lpc;
119: $hash{'map_id_'.$lpc}=$uri;
120:
121: # Determine and check filename
122: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
123:
124: my $ispage=($fn=~/\.page$/);
125:
126: unless (($fn=~/\.sequence$/) ||
127: ($fn=~/\.page$/)) {
128: $errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
129: return;
130: }
131:
132: my $instr=&Apache::lonnet::getfile($fn);
133:
134: unless ($instr eq -1) {
135:
136: # Successfully got file, parse it
137:
138: my $parser = HTML::TokeParser->new(\$instr);
139: $parser->attr_encoded(1);
140: my $token;
141:
142: my $linkpc=0;
143:
144: $fn=~/\.(\w+)$/;
145:
146: $hash{'map_type_'.$lpc}=$1;
147:
148: while ($token = $parser->get_token) {
149: if ($token->[0] eq 'S') {
150: if ($token->[1] eq 'resource') {
151: # -------------------------------------------------------------------- Resource
152: if ($token->[2]->{'type'} eq 'zombie') { next; }
153: my $rid=$lpc.'.'.$token->[2]->{'id'};
154:
155: $hash{'kind_'.$rid}='res';
156: $hash{'title_'.$rid}=$token->[2]->{'title'};
157: my $turi=&versiontrack($token->[2]->{'src'});
158: if ($token->[2]->{'version'}) {
159: unless ($hash{'version_'.$turi}) {
160: $hash{'version_'.$turi}=$1;
161: }
162: }
163: my $title=$token->[2]->{'title'};
164: $title=~s/\&colon\;/\:/gs;
165: # my $symb=&Apache::lonnet::encode_symb($uri,
166: # $token->[2]->{'id'},
167: # $turi);
168: # &Apache::lonnet::do_cache_new('title',$symb,$title);
169: unless ($ispage) {
170: $turi=~/\.(\w+)$/;
171: my $embstyle=&Apache::loncommon::fileembstyle($1);
172: if ($token->[2]->{'external'} eq 'true') { # external
173: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
174: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
175: if (($embstyle eq 'img')
176: || ($embstyle eq 'emb')
177: || ($embstyle eq 'wrp')) {
178: $turi='/adm/wrapper'.$turi;
179: } elsif ($embstyle eq 'ssi') {
180: #do nothing with these
181: } elsif ($turi!~/\.(sequence|page)$/) {
182: $turi='/adm/coursedocs/showdoc'.$turi;
183: }
184: } elsif ($turi=~/\S/) { # normal non-empty internal resource
185: my $mapdir=$uri;
186: $mapdir=~s/[^\/]+$//;
187: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
188: if (($embstyle eq 'img')
189: || ($embstyle eq 'emb')
190: || ($embstyle eq 'wrp')) {
191: $turi='/adm/wrapper'.$turi;
192: }
193: }
194: }
195: # Store reverse lookup, remove query string
196: my $idsuri=$turi;
197: $idsuri=~s/\?.+$//;
198: if (defined($hash{'ids_'.$idsuri})) {
199: $hash{'ids_'.$idsuri}.=','.$rid;
200: } else {
201: $hash{'ids_'.$idsuri}=''.$rid;
202: }
203:
204: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
205: $turi.='?register=1';
206: }
207:
208: $hash{'src_'.$rid}=$turi;
209:
210: if ($token->[2]->{'external'} eq 'true') {
211: $hash{'ext_'.$rid}='true:';
212: } else {
213: $hash{'ext_'.$rid}='false:';
214: }
215: if ($token->[2]->{'type'}) {
216: $hash{'type_'.$rid}=$token->[2]->{'type'};
217: if ($token->[2]->{'type'} eq 'start') {
218: $hash{'map_start_'.$uri}="$rid";
219: }
220: if ($token->[2]->{'type'} eq 'finish') {
221: $hash{'map_finish_'.$uri}="$rid";
222: }
223: } else {
224: $hash{'type_'.$rid}='normal';
225: }
226:
227: if (($turi=~/\.sequence$/) ||
228: ($turi=~/\.page$/)) {
229: $hash{'is_map_'.$rid}=1;
230: &loadmap($turi);
231: }
232:
233: } elsif ($token->[1] eq 'condition') {
234: # ------------------------------------------------------------------- Condition
235:
236: my $rid=$lpc.'.'.$token->[2]->{'id'};
237:
238: $hash{'kind_'.$rid}='cond';
239: my $condition = $token->[2]->{'value'};
240: $condition =~ s/[\n\r]+/ /gs;
241: push(@cond, $condition);
242: $hash{'condid_'.$rid}=$#cond;
243: if ($token->[2]->{'type'}) {
244: $cond[$#cond].=':'.$token->[2]->{'type'};
245: } else {
246: $cond[$#cond].=':normal';
247: }
248:
249: } elsif ($token->[1] eq 'link') {
250: # ----------------------------------------------------------------------- Links
251:
252: $linkpc++;
253: my $linkid=$lpc.'.'.$linkpc;
254:
255: my $goesto=$lpc.'.'.$token->[2]->{'to'};
256: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
257: my $undercond=0;
258:
259: if ($token->[2]->{'condition'}) {
260: $undercond=$lpc.'.'.$token->[2]->{'condition'};
261: }
262:
263: $hash{'goesto_'.$linkid}=$goesto;
264: $hash{'comesfrom_'.$linkid}=$comesfrom;
265: $hash{'undercond_'.$linkid}=$undercond;
266:
267: if (defined($hash{'to_'.$comesfrom})) {
268: $hash{'to_'.$comesfrom}.=','.$linkid;
269: } else {
270: $hash{'to_'.$comesfrom}=''.$linkid;
271: }
272: if (defined($hash{'from_'.$goesto})) {
273: $hash{'from_'.$goesto}.=','.$linkid;
274: } else {
275: $hash{'from_'.$goesto}=''.$linkid;
276: }
277: } elsif ($token->[1] eq 'param') {
278: # ------------------------------------------------------------------- Parameter
279:
280: my $referid=$lpc.'.'.$token->[2]->{'to'};
281: my $name=$token->[2]->{'name'};
282: my $part;
283: if ($name=~/^parameter_(.*)_/) {
284: $part=$1;
285: } else {
286: $part=0;
287: }
288: $name=~s/^.*_([^_]*)$/$1/;
289: my $newparam=
290: &escape($token->[2]->{'type'}).':'.
291: &escape($part.'.'.$name).'='.
292: &escape($token->[2]->{'value'});
293: if (defined($hash{'param_'.$referid})) {
294: $hash{'param_'.$referid}.='&'.$newparam;
295: } else {
296: $hash{'param_'.$referid}=''.$newparam;
297: }
298: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
299: $randompick{$referid}=$token->[2]->{'value'};
300: }
301: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
302: $randompickseed{$referid}=$token->[2]->{'value'};
303: }
304: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
305: if ($token->[2]->{'value'}=~/^yes$/i) {
306: $encurl{$referid}=1;
307: }
308: }
309: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
310: if ($token->[2]->{'value'}=~/^yes$/i) {
311: $hiddenurl{$referid}=1;
312: }
313: }
314: }
315:
316: }
317: }
318:
319: } else {
320: $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
321: }
322:
323: my $parser = HTML::TokeParser->new(\$instr);
324: $parser->attr_encoded(1);
325: # last parse out the mapalias params so as to ignore anything
326: # refering to non-existant resources
327: while (my $token = $parser->get_token) {
328: next if ($token->[0] ne 'S');
329: if ($token->[1] eq 'param') {
330: &parse_mapalias_param($token,$lpc);
331: }
332: }
333: }
334:
335: sub parse_mapalias_param {
336: my ($token,$lpc) = @_;
337: my $referid=$lpc.'.'.$token->[2]->{'to'};
338: return if (!exists($hash{'src_'.$referid}));
339:
340: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
341: &count_mapalias($token->[2]->{'value'},$referid);
342: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
343: }
344: }
345:
346: # --------------------------------------------------------- Simplify expression
347:
348: sub simplify {
349: my $expression=shift;
350: # (0&1) = 1
351: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
352: # (8)=8
353: $expression=~s/\(([_\.\d]+)\)/$1/g;
354: # 8&8=8
355: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
356: # 8|8=8
357: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
358: # (5&3)&4=5&3&4
359: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
360: # (((5&3)|(4&6)))=((5&3)|(4&6))
361: $expression=~
362: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
363: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
364: $expression=~
365: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
366: return $expression;
367: }
368:
369: # -------------------------------------------------------- Build condition hash
370:
371: sub traceroute {
372: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
373: my $newsofar=$sofar=simplify($sofar);
374: unless ($beenhere=~/\&\Q$rid\E\&/) {
375: $beenhere.=$rid.'&';
376: my ($mapid,$resid)=split(/\./,$rid);
377: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
378: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
379:
380: if ($hdnflag || lc($hidden) eq 'yes') {
381: $hiddenurl{$rid}=1;
382: }
383: if (!$hdnflag && lc($hidden) eq 'no') {
384: delete($hiddenurl{$rid});
385: }
386:
387: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
388: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
389: if (($retfrid eq '') && ($hash{'src_'.$rid})
390: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
391: $retfrid=$rid;
392: }
393: if (defined($hash{'conditions_'.$rid})) {
394: $hash{'conditions_'.$rid}=simplify(
395: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
396: } else {
397: $hash{'conditions_'.$rid}=$sofar;
398: }
399:
400: # if the expression is just the 0th condition keep it
401: # otherwise leave a pointer to this condition expression
402: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
403:
404: if (defined($hash{'is_map_'.$rid})) {
405: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
406: $sofar=$newsofar=
407: &traceroute($sofar,
408: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
409: $encflag || $encurl{$rid},
410: $hdnflag || $hiddenurl{$rid});
411: }
412: }
413: if (defined($hash{'to_'.$rid})) {
414: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
415: my $further=$sofar;
416: if ($hash{'undercond_'.$id}) {
417: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
418: $further=simplify('('.'_'.$rid.')&('.
419: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
420: } else {
421: $errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
422: }
423: }
424: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
425: $encflag,$hdnflag);
426: }
427: }
428: }
429: return $newsofar;
430: }
431:
432: # ------------------------------ Cascading conditions, quick access, parameters
433:
434: sub accinit {
435: my ($uri,$short,$fn)=@_;
436: my %acchash=();
437: my %captured=();
438: my $condcounter=0;
439: $acchash{'acc.cond.'.$short.'.0'}=0;
440: foreach my $key (keys(%hash)) {
441: if ($key=~/^conditions/) {
442: my $expr=$hash{$key};
443: # try to find and factor out common sub-expressions
444: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
445: my $orig=$sub;
446:
447: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
448: next if (!defined($factor));
449:
450: $sub=~s/\Q$factor\E//g;
451: $sub=~s/^\(/\($factor\(/;
452: $sub.=')';
453: $sub=simplify($sub);
454: $expr=~s/\Q$orig\E/$sub/;
455: }
456: $hash{$key}=$expr;
457: unless (defined($captured{$expr})) {
458: $condcounter++;
459: $captured{$expr}=$condcounter;
460: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
461: }
462: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
463: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
464: $hash{'src_'.$1.'.'.$2});
465: foreach my $param (split(/\&/,$hash{$key})) {
466: my ($typename,$value)=split(/\=/,$param);
467: my ($type,$name)=split(/\:/,$typename);
468: $parmhash{$prefix.'.'.&unescape($name)}=
469: &unescape($value);
470: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
471: &unescape($type);
472: }
473: }
474: }
475: foreach my $key (keys(%hash)) {
476: if ($key=~/^ids/) {
477: foreach my $resid (split(/\,/,$hash{$key})) {
478: my $uri=$hash{'src_'.$resid};
479: my ($uripath,$urifile) =
480: &Apache::lonnet::split_uri_for_cond($uri);
481: if ($uripath) {
482: my $uricond='0';
483: if (defined($hash{'conditions_'.$resid})) {
484: $uricond=$captured{$hash{'conditions_'.$resid}};
485: }
486: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
487: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
488: /(\&\Q$urifile\E\:[^\&]*)/) {
489: my $replace=$1;
490: my $regexp=$replace;
491: #$regexp=~s/\|/\\\|/g;
492: $acchash{'acc.res.'.$short.'.'.$uripath} =~
493: s/\Q$regexp\E/$replace\|$uricond/;
494: } else {
495: $acchash{'acc.res.'.$short.'.'.$uripath}.=
496: $urifile.':'.$uricond.'&';
497: }
498: } else {
499: $acchash{'acc.res.'.$short.'.'.$uripath}=
500: '&'.$urifile.':'.$uricond.'&';
501: }
502: }
503: }
504: }
505: }
506: $acchash{'acc.res.'.$short.'.'}='&:0&';
507: my $courseuri=$uri;
508: $courseuri=~s/^\/res\///;
509: &Apache::lonnet::delenv('(acc\.|httpref\.)');
510: &Apache::lonnet::appenv(%acchash);
511: }
512:
513: # ---------------- Selectively delete from randompick maps and hidden url parms
514:
515: sub hiddenurls {
516: my $randomoutentry='';
517: foreach my $rid (keys %randompick) {
518: my $rndpick=$randompick{$rid};
519: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
520: # ------------------------------------------- put existing resources into array
521: my @currentrids=();
522: foreach my $key (sort(keys(%hash))) {
523: if ($key=~/^src_($mpc\.\d+)/) {
524: if ($hash{'src_'.$1}) { push @currentrids, $1; }
525: }
526: }
527: # rids are number.number and we want to numercially sort on
528: # the second number
529: @currentrids=sort {
530: my (undef,$aid)=split(/\./,$a);
531: my (undef,$bid)=split(/\./,$b);
532: $aid <=> $bid;
533: } @currentrids;
534: next if ($#currentrids<$rndpick);
535: # -------------------------------- randomly eliminate the ones that should stay
536: my (undef,$id)=split(/\./,$rid);
537: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
538: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
539: &Apache::lonnet::setup_random_from_rndseed($rndseed);
540: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
541: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
542: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
543: # -------------------------------------------------------- delete the leftovers
544: for (my $k=0; $k<=$#currentrids; $k++) {
545: if ($currentrids[$k]) {
546: $hash{'randomout_'.$currentrids[$k]}=1;
547: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
548: $randomoutentry.='&'.
549: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
550: $resid,
551: $hash{'src_'.$currentrids[$k]}
552: ).'&';
553: }
554: }
555: }
556: # ------------------------------ take care of explicitly hidden urls or folders
557: foreach my $rid (keys %hiddenurl) {
558: $hash{'randomout_'.$rid}=1;
559: my ($mapid,$resid)=split(/\./,$rid);
560: $randomoutentry.='&'.
561: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
562: $hash{'src_'.$rid}).'&';
563: }
564: # --------------------------------------- append randomout entry to environment
565: if ($randomoutentry) {
566: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
567: }
568: }
569:
570: # ---------------------------------------------------- Read map and all submaps
571:
572: sub readmap {
573: my $short=shift;
574: $short=~s/^\///;
575: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
576: my $fn=$cenv{'fn'};
577: my $uri;
578: $short=~s/\//\_/g;
579: unless ($uri=$cenv{'url'}) {
580: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
581: "Could not load course $short.</font>");
582: return ('',&mt('No course data available.'));;
583: }
584: @cond=('true:normal');
585:
586: open(LOCKFILE,">$fn.db.lock");
587: my $lock=0;
588: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
589: $lock=1;
590: unlink($fn.'.db');
591: unlink($fn.'_symb.db');
592: unlink($fn.'.state');
593: unlink($fn.'parms.db');
594: }
595: undef %randompick;
596: undef %hiddenurl;
597: undef %encurl;
598: $retfrid='';
599: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
600: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
601: %hash=();
602: %parmhash=();
603: $errtext='';
604: $pc=0;
605: &clear_mapalias_count();
606: &processversionfile(%cenv);
607: my $furi=&Apache::lonnet::clutter($uri);
608: $hash{'src_0.0'}=&versiontrack($furi);
609: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
610: $hash{'ids_'.$furi}='0.0';
611: $hash{'is_map_0.0'}=1;
612: loadmap($uri);
613: if (defined($hash{'map_start_'.$uri})) {
614: &Apache::lonnet::appenv("request.course.id" => $short,
615: "request.course.fn" => $fn,
616: "request.course.uri" => $uri);
617: $env{'request.course.id'}=$short;
618: &traceroute('0',$hash{'map_start_'.$uri},'&');
619: &accinit($uri,$short,$fn);
620: &hiddenurls();
621: }
622: $errtext .= &get_mapalias_errors();
623: # ------------------------------------------------------- Put versions into src
624: foreach my $key (keys(%hash)) {
625: if ($key=~/^src_/) {
626: $hash{$key}=&putinversion($hash{$key});
627: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
628: my ($type, $url) = ($1,$2);
629: my $value = $hash{$key};
630: $hash{$type.&putinversion($url)}=$value;
631: }
632: }
633: # ---------------------------------------------------------------- Encrypt URLs
634: foreach my $id (keys(%encurl)) {
635: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
636: $hash{'encrypted_'.$id}=1;
637: }
638: # ----------------------------------------------- Close hashes to finally store
639: # --------------------------------- Routine must pass this point, no early outs
640: $hash{'first_rid'}=$retfrid;
641: my ($mapid,$resid)=split(/\./,$retfrid);
642: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
643: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
644: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
645: if ($hash{'encrypted_'.$retfrid}) {
646: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
647: }
648: $hash{'first_url'}=$retfurl;
649: unless ((untie(%hash)) && (untie(%parmhash))) {
650: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
651: "Could not untie coursemap $fn for $uri.</font>");
652: }
653: # ---------------------------------------------------- Store away initial state
654: {
655: my $cfh;
656: if (open($cfh,">$fn.state")) {
657: print $cfh join("\n",@cond);
658: } else {
659: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
660: "Could not write statemap $fn for $uri.</font>");
661: }
662: }
663: flock(LOCKFILE,LOCK_UN);
664: close(LOCKFILE);
665: } else {
666: # if we are here it is likely because we are already trying to
667: # initialize the course in another child, busy wait trying to
668: # tie the hashes for the next 90 seconds, if we succeed forward
669: # them on to navmaps, if we fail, throw up the Could not init
670: # course screen
671: if ($lock) {
672: # Got the lock but not the DB files
673: flock(LOCKFILE,LOCK_UN);
674: }
675: untie(%hash);
676: untie(%parmhash);
677: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
678: "Could not tie coursemap $fn for $uri.</font>");
679: my $i=0;
680: while($i<90) {
681: $i++;
682: sleep(1);
683: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
684: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
685: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
686: $retfurl='/adm/navmaps';
687: &Apache::lonnet::appenv("request.course.id" => $short,
688: "request.course.fn" => $fn,
689: "request.course.uri" => $uri);
690: untie(%hash);
691: untie(%parmhash);
692: last;
693: }
694: }
695: untie(%hash);
696: untie(%parmhash);
697: }
698: flock(LOCKFILE,LOCK_UN);
699: close(LOCKFILE);
700: }
701: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
702: # ------------------------------------------------- Check for critical messages
703:
704: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
705: $env{'user.name'});
706: if ($what[0]) {
707: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
708: $retfurl='/adm/email?critical=display';
709: }
710: }
711: return ($retfurl,$errtext);
712: }
713:
714: # ------------------------------------------------------- Evaluate state string
715:
716: sub evalstate {
717: my $fn=$env{'request.course.fn'}.'.state';
718: my $state='';
719: if (-e $fn) {
720: my @conditions=();
721: {
722: open(my $fh,"<$fn");
723: @conditions=<$fh>;
724: close($fh);
725: }
726: my $safeeval = new Safe;
727: my $safehole = new Safe::Hole;
728: $safeeval->permit("entereval");
729: $safeeval->permit(":base_math");
730: $safeeval->deny(":base_io");
731: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
732: foreach my $line (@conditions) {
733: chomp($line);
734: my ($condition,$weight)=split(/\:/,$line);
735: if ($safeeval->reval($condition)) {
736: if ($weight eq 'force') {
737: $state.='3';
738: } else {
739: $state.='2';
740: }
741: } else {
742: if ($weight eq 'stop') {
743: $state.='0';
744: } else {
745: $state.='1';
746: }
747: }
748: }
749: }
750: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
751: return $state;
752: }
753:
754: {
755: my %mapalias_cache;
756: sub count_mapalias {
757: my ($value,$resid) = @_;
758: push(@{ $mapalias_cache{$value} }, $resid);
759: }
760:
761: sub get_mapalias_errors {
762: my $error_text;
763: foreach my $mapalias (sort(keys(%mapalias_cache))) {
764: next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
765: my $count;
766: my $which =
767: join('</li><li>',
768: map {
769: my $id = $_;
770: if (exists($hash{'src_'.$id})) {
771: $count++;
772: }
773: my ($mapid) = split(/\./,$id);
774: &mt('[_1] in [_2]', $hash{'title_'.$id},
775:
776: $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
777: } (@{ $mapalias_cache{$mapalias} }));
778: next if ($count < 2);
779: $error_text .= '<div class="LC_error">'.
780: &mt('Error: Found the mapalias "[_1]" defined multiple times.',
781: $mapalias).
782: '</div><ul><li>'.$which.'</li></ul>';
783: }
784: &clear_mapalias_count();
785: return $error_text;
786: }
787: sub clear_mapalias_count {
788: undef(%mapalias_cache);
789: }
790: }
791: 1;
792: __END__
793:
794: =head1 NAME
795:
796: Apache::lonuserstate - Construct and maintain state and binary representation
797: of course for user
798:
799: =head1 SYNOPSIS
800:
801: Invoked by lonroles.pm.
802:
803: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
804:
805: =head1 INTRODUCTION
806:
807: This module constructs and maintains state and binary representation
808: of course for user.
809:
810: This is part of the LearningOnline Network with CAPA project
811: described at http://www.lon-capa.org.
812:
813: =head1 HANDLER SUBROUTINE
814:
815: There is no handler subroutine.
816:
817: =head1 OTHER SUBROUTINES
818:
819: =over 4
820:
821: =item *
822:
823: loadmap() : Loads map from disk
824:
825: =item *
826:
827: simplify() : Simplify expression
828:
829: =item *
830:
831: traceroute() : Build condition hash
832:
833: =item *
834:
835: accinit() : Cascading conditions, quick access, parameters
836:
837: =item *
838:
839: readmap() : Read map and all submaps
840:
841: =item *
842:
843: evalstate() : Evaluate state string
844:
845: =back
846:
847: =cut
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