1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
4: # $Id: lonuserstate.pm,v 1.125 2007/10/16 21:14:53 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 %randomorder; # maps to order contents randomly
60: my %encurl; # URLs in this folder are supposed to be encrypted
61: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
62:
63: # ----------------------------------- Remove version from URL and store in hash
64:
65: sub versiontrack {
66: my $uri=shift;
67: if ($uri=~/\.(\d+)\.\w+$/) {
68: my $version=$1;
69: $uri=~s/\.\d+\.(\w+)$/\.$1/;
70: unless ($hash{'version_'.$uri}) {
71: $hash{'version_'.$uri}=$version;
72: }
73: }
74: return $uri;
75: }
76:
77: # -------------------------------------------------------------- Put in version
78:
79: sub putinversion {
80: my $uri=shift;
81: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
82: if ($hash{'version_'.$uri}) {
83: my $version=$hash{'version_'.$uri};
84: if ($version eq 'mostrecent') { return $uri; }
85: if ($version eq &Apache::lonnet::getversion(
86: &Apache::lonnet::filelocation('',$uri)))
87: { return $uri; }
88: $uri=~s/\.(\w+)$/\.$version\.$1/;
89: }
90: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
91: return $uri;
92: }
93:
94: # ----------------------------------------- Processing versions file for course
95:
96: sub processversionfile {
97: my %cenv=@_;
98: my %versions=&Apache::lonnet::dump('resourceversions',
99: $cenv{'domain'},
100: $cenv{'num'});
101: foreach my $ver (keys(%versions)) {
102: if ($ver=~/^error\:/) { return; }
103: $hash{'version_'.$ver}=$versions{$ver};
104: }
105: }
106:
107: # --------------------------------------------------------- Loads map from disk
108:
109: sub loadmap {
110: my ($uri,$parent_rid)=@_;
111: if ($hash{'map_pc_'.$uri}) {
112: $errtext.='<p class="LC_error">'.
113: &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
114: '</p>';
115: return;
116: }
117: $pc++;
118: my $lpc=$pc;
119: $hash{'map_pc_'.$uri}=$lpc;
120: $hash{'map_id_'.$lpc}=$uri;
121:
122: # Determine and check filename
123: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
124:
125: my $ispage=($fn=~/\.page$/);
126:
127: unless (($fn=~/\.sequence$/) ||
128: ($fn=~/\.page$/)) {
129: $errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
130: return;
131: }
132:
133: my $instr=&Apache::lonnet::getfile($fn);
134:
135: if ($instr eq -1) {
136: $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
137: return;
138: }
139:
140: # Successfully got file, parse it
141:
142: my $parser = HTML::TokeParser->new(\$instr);
143: $parser->attr_encoded(1);
144: # first get all parameters
145: while (my $token = $parser->get_token) {
146: next if ($token->[0] ne 'S');
147: if ($token->[1] eq 'param') {
148: &parse_param($token,$lpc);
149: }
150: }
151: #reset parser
152: $parser = HTML::TokeParser->new(\$instr);
153: $parser->attr_encoded(1);
154:
155: my $linkpc=0;
156:
157: $fn=~/\.(\w+)$/;
158:
159: $hash{'map_type_'.$lpc}=$1;
160:
161: my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
162:
163: my @map_ids;
164: while (my $token = $parser->get_token) {
165: next if ($token->[0] ne 'S');
166: if ($token->[1] eq 'resource') {
167: push(@map_ids,&parse_resource($token,$lpc,$ispage,$uri));
168: } elsif ($token->[1] eq 'link' && !$randomize) {
169: # ----------------------------------------------------------------------- Links
170: &make_link(++$linkpc,$lpc,$token->[2]->{'to'},
171: $token->[2]->{'from'},
172: $token->[2]->{'condition'});
173: } elsif ($token->[1] eq 'condition' && !$randomize) {
174: &parse_condition($token,$lpc);
175: }
176: }
177:
178: if ($randomize) {
179: if (!$env{'request.role.adv'}) {
180: my $seed;
181: if (defined($randompickseed{$parent_rid})) {
182: $seed = $randompickseed{$parent_rid};
183: } else {
184: my ($mapid,$resid)=split(/\./,$parent_rid);
185: my $symb=
186: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
187: $resid,$hash{'src_'.$parent_rid});
188:
189: $seed = $symb;
190: }
191:
192: my $rndseed=&Apache::lonnet::rndseed($seed);
193: &Apache::lonnet::setup_random_from_rndseed($rndseed);
194: @map_ids=&Math::Random::random_permutation(@map_ids);
195: }
196: my $from = shift(@map_ids);
197: my $from_rid = $lpc.'.'.$from;
198: $hash{'map_start_'.$uri} = $from_rid;
199: $hash{'type_'.$from_rid}='start';
200:
201: while (my $to = shift(@map_ids)) {
202: &make_link(++$linkpc,$lpc,$to,$from);
203: my $to_rid = $lpc.'.'.$to;
204: $hash{'type_'.$to_rid}='normal';
205: $from = $to;
206: $from_rid = $to_rid;
207: }
208:
209: $hash{'map_finish_'.$uri}= $from_rid;
210: $hash{'type_'.$from_rid}='finish';
211: }
212:
213: my $parser = HTML::TokeParser->new(\$instr);
214: $parser->attr_encoded(1);
215: # last parse out the mapalias params so as to ignore anything
216: # refering to non-existant resources
217: while (my $token = $parser->get_token) {
218: next if ($token->[0] ne 'S');
219: if ($token->[1] eq 'param') {
220: &parse_mapalias_param($token,$lpc);
221: }
222: }
223: }
224:
225:
226: # -------------------------------------------------------------------- Resource
227: sub parse_resource {
228: my ($token,$lpc,$ispage,$uri) = @_;
229: if ($token->[2]->{'type'} eq 'zombie') { next; }
230: my $rid=$lpc.'.'.$token->[2]->{'id'};
231:
232: $hash{'kind_'.$rid}='res';
233: $hash{'title_'.$rid}=$token->[2]->{'title'};
234: my $turi=&versiontrack($token->[2]->{'src'});
235: if ($token->[2]->{'version'}) {
236: unless ($hash{'version_'.$turi}) {
237: $hash{'version_'.$turi}=$1;
238: }
239: }
240: my $title=$token->[2]->{'title'};
241: $title=~s/\&colon\;/\:/gs;
242: # my $symb=&Apache::lonnet::encode_symb($uri,
243: # $token->[2]->{'id'},
244: # $turi);
245: # &Apache::lonnet::do_cache_new('title',$symb,$title);
246: unless ($ispage) {
247: $turi=~/\.(\w+)$/;
248: my $embstyle=&Apache::loncommon::fileembstyle($1);
249: if ($token->[2]->{'external'} eq 'true') { # external
250: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
251: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
252: if (($embstyle eq 'img')
253: || ($embstyle eq 'emb')
254: || ($embstyle eq 'wrp')) {
255: $turi='/adm/wrapper'.$turi;
256: } elsif ($embstyle eq 'ssi') {
257: #do nothing with these
258: } elsif ($turi!~/\.(sequence|page)$/) {
259: $turi='/adm/coursedocs/showdoc'.$turi;
260: }
261: } elsif ($turi=~/\S/) { # normal non-empty internal resource
262: my $mapdir=$uri;
263: $mapdir=~s/[^\/]+$//;
264: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
265: if (($embstyle eq 'img')
266: || ($embstyle eq 'emb')
267: || ($embstyle eq 'wrp')) {
268: $turi='/adm/wrapper'.$turi;
269: }
270: }
271: }
272: # Store reverse lookup, remove query string
273: my $idsuri=$turi;
274: $idsuri=~s/\?.+$//;
275: if (defined($hash{'ids_'.$idsuri})) {
276: $hash{'ids_'.$idsuri}.=','.$rid;
277: } else {
278: $hash{'ids_'.$idsuri}=''.$rid;
279: }
280:
281: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
282: $turi.='?register=1';
283: }
284:
285: $hash{'src_'.$rid}=$turi;
286:
287: if ($token->[2]->{'external'} eq 'true') {
288: $hash{'ext_'.$rid}='true:';
289: } else {
290: $hash{'ext_'.$rid}='false:';
291: }
292: if ($token->[2]->{'type'}) {
293: $hash{'type_'.$rid}=$token->[2]->{'type'};
294: if ($token->[2]->{'type'} eq 'start') {
295: $hash{'map_start_'.$uri}="$rid";
296: }
297: if ($token->[2]->{'type'} eq 'finish') {
298: $hash{'map_finish_'.$uri}="$rid";
299: }
300: } else {
301: $hash{'type_'.$rid}='normal';
302: }
303:
304: if (($turi=~/\.sequence$/) ||
305: ($turi=~/\.page$/)) {
306: $hash{'is_map_'.$rid}=1;
307: &loadmap($turi,$rid);
308: }
309: return $token->[2]->{'id'};
310: }
311:
312: sub make_link {
313: my ($linkpc,$lpc,$to,$from,$condition) = @_;
314:
315: my $linkid=$lpc.'.'.$linkpc;
316: my $goesto=$lpc.'.'.$to;
317: my $comesfrom=$lpc.'.'.$from;
318: my $undercond=0;
319:
320: if ($condition) {
321: $undercond=$lpc.'.'.$condition;
322: }
323:
324: $hash{'goesto_'.$linkid}=$goesto;
325: $hash{'comesfrom_'.$linkid}=$comesfrom;
326: $hash{'undercond_'.$linkid}=$undercond;
327:
328: if (defined($hash{'to_'.$comesfrom})) {
329: $hash{'to_'.$comesfrom}.=','.$linkid;
330: } else {
331: $hash{'to_'.$comesfrom}=''.$linkid;
332: }
333: if (defined($hash{'from_'.$goesto})) {
334: $hash{'from_'.$goesto}.=','.$linkid;
335: } else {
336: $hash{'from_'.$goesto}=''.$linkid;
337: }
338: }
339:
340: # ------------------------------------------------------------------- Condition
341: sub parse_condition {
342: my ($token,$lpc) = @_;
343: my $rid=$lpc.'.'.$token->[2]->{'id'};
344:
345: $hash{'kind_'.$rid}='cond';
346:
347: my $condition = $token->[2]->{'value'};
348: $condition =~ s/[\n\r]+/ /gs;
349: push(@cond, $condition);
350: $hash{'condid_'.$rid}=$#cond;
351: if ($token->[2]->{'type'}) {
352: $cond[$#cond].=':'.$token->[2]->{'type'};
353: } else {
354: $cond[$#cond].=':normal';
355: }
356: }
357:
358: # ------------------------------------------------------------------- Parameter
359:
360: sub parse_param {
361: my ($token,$lpc) = @_;
362: my $referid=$lpc.'.'.$token->[2]->{'to'};
363: my $name=$token->[2]->{'name'};
364: my $part;
365: if ($name=~/^parameter_(.*)_/) {
366: $part=$1;
367: } else {
368: $part=0;
369: }
370: $name=~s/^.*_([^_]*)$/$1/;
371: my $newparam=
372: &escape($token->[2]->{'type'}).':'.
373: &escape($part.'.'.$name).'='.
374: &escape($token->[2]->{'value'});
375: if (defined($hash{'param_'.$referid})) {
376: $hash{'param_'.$referid}.='&'.$newparam;
377: } else {
378: $hash{'param_'.$referid}=''.$newparam;
379: }
380: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
381: $randompick{$referid}=$token->[2]->{'value'};
382: }
383: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
384: $randompickseed{$referid}=$token->[2]->{'value'};
385: }
386: if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) {
387: $randomorder{$referid}=$token->[2]->{'value'};
388: }
389: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
390: if ($token->[2]->{'value'}=~/^yes$/i) {
391: $encurl{$referid}=1;
392: }
393: }
394: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
395: if ($token->[2]->{'value'}=~/^yes$/i) {
396: $hiddenurl{$referid}=1;
397: }
398: }
399: }
400:
401: sub parse_mapalias_param {
402: my ($token,$lpc) = @_;
403: my $referid=$lpc.'.'.$token->[2]->{'to'};
404: return if (!exists($hash{'src_'.$referid}));
405:
406: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
407: &count_mapalias($token->[2]->{'value'},$referid);
408: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
409: }
410: }
411:
412: # --------------------------------------------------------- Simplify expression
413:
414: sub simplify {
415: my $expression=shift;
416: # (0&1) = 1
417: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
418: # (8)=8
419: $expression=~s/\(([_\.\d]+)\)/$1/g;
420: # 8&8=8
421: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
422: # 8|8=8
423: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
424: # (5&3)&4=5&3&4
425: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
426: # (((5&3)|(4&6)))=((5&3)|(4&6))
427: $expression=~
428: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
429: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
430: $expression=~
431: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
432: return $expression;
433: }
434:
435: # -------------------------------------------------------- Build condition hash
436:
437: sub traceroute {
438: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
439: my $newsofar=$sofar=simplify($sofar);
440: unless ($beenhere=~/\&\Q$rid\E\&/) {
441: $beenhere.=$rid.'&';
442: my ($mapid,$resid)=split(/\./,$rid);
443: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
444: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
445:
446: if ($hdnflag || lc($hidden) eq 'yes') {
447: $hiddenurl{$rid}=1;
448: }
449: if (!$hdnflag && lc($hidden) eq 'no') {
450: delete($hiddenurl{$rid});
451: }
452:
453: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
454: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
455: if (($retfrid eq '') && ($hash{'src_'.$rid})
456: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
457: $retfrid=$rid;
458: }
459: if (defined($hash{'conditions_'.$rid})) {
460: $hash{'conditions_'.$rid}=simplify(
461: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
462: } else {
463: $hash{'conditions_'.$rid}=$sofar;
464: }
465:
466: # if the expression is just the 0th condition keep it
467: # otherwise leave a pointer to this condition expression
468: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
469:
470: if (defined($hash{'is_map_'.$rid})) {
471: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
472: $sofar=$newsofar=
473: &traceroute($sofar,
474: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
475: $encflag || $encurl{$rid},
476: $hdnflag || $hiddenurl{$rid});
477: }
478: }
479: if (defined($hash{'to_'.$rid})) {
480: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
481: my $further=$sofar;
482: if ($hash{'undercond_'.$id}) {
483: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
484: $further=simplify('('.'_'.$rid.')&('.
485: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
486: } else {
487: $errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
488: }
489: }
490: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
491: $encflag,$hdnflag);
492: }
493: }
494: }
495: return $newsofar;
496: }
497:
498: # ------------------------------ Cascading conditions, quick access, parameters
499:
500: sub accinit {
501: my ($uri,$short,$fn)=@_;
502: my %acchash=();
503: my %captured=();
504: my $condcounter=0;
505: $acchash{'acc.cond.'.$short.'.0'}=0;
506: foreach my $key (keys(%hash)) {
507: if ($key=~/^conditions/) {
508: my $expr=$hash{$key};
509: # try to find and factor out common sub-expressions
510: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
511: my $orig=$sub;
512:
513: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
514: next if (!defined($factor));
515:
516: $sub=~s/\Q$factor\E//g;
517: $sub=~s/^\(/\($factor\(/;
518: $sub.=')';
519: $sub=simplify($sub);
520: $expr=~s/\Q$orig\E/$sub/;
521: }
522: $hash{$key}=$expr;
523: unless (defined($captured{$expr})) {
524: $condcounter++;
525: $captured{$expr}=$condcounter;
526: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
527: }
528: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
529: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
530: $hash{'src_'.$1.'.'.$2});
531: foreach my $param (split(/\&/,$hash{$key})) {
532: my ($typename,$value)=split(/\=/,$param);
533: my ($type,$name)=split(/\:/,$typename);
534: $parmhash{$prefix.'.'.&unescape($name)}=
535: &unescape($value);
536: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
537: &unescape($type);
538: }
539: }
540: }
541: foreach my $key (keys(%hash)) {
542: if ($key=~/^ids/) {
543: foreach my $resid (split(/\,/,$hash{$key})) {
544: my $uri=$hash{'src_'.$resid};
545: my ($uripath,$urifile) =
546: &Apache::lonnet::split_uri_for_cond($uri);
547: if ($uripath) {
548: my $uricond='0';
549: if (defined($hash{'conditions_'.$resid})) {
550: $uricond=$captured{$hash{'conditions_'.$resid}};
551: }
552: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
553: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
554: /(\&\Q$urifile\E\:[^\&]*)/) {
555: my $replace=$1;
556: my $regexp=$replace;
557: #$regexp=~s/\|/\\\|/g;
558: $acchash{'acc.res.'.$short.'.'.$uripath} =~
559: s/\Q$regexp\E/$replace\|$uricond/;
560: } else {
561: $acchash{'acc.res.'.$short.'.'.$uripath}.=
562: $urifile.':'.$uricond.'&';
563: }
564: } else {
565: $acchash{'acc.res.'.$short.'.'.$uripath}=
566: '&'.$urifile.':'.$uricond.'&';
567: }
568: }
569: }
570: }
571: }
572: $acchash{'acc.res.'.$short.'.'}='&:0&';
573: my $courseuri=$uri;
574: $courseuri=~s/^\/res\///;
575: &Apache::lonnet::delenv('(acc\.|httpref\.)');
576: &Apache::lonnet::appenv(%acchash);
577: }
578:
579: # ---------------- Selectively delete from randompick maps and hidden url parms
580:
581: sub hiddenurls {
582: my $randomoutentry='';
583: foreach my $rid (keys %randompick) {
584: my $rndpick=$randompick{$rid};
585: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
586: # ------------------------------------------- put existing resources into array
587: my @currentrids=();
588: foreach my $key (sort(keys(%hash))) {
589: if ($key=~/^src_($mpc\.\d+)/) {
590: if ($hash{'src_'.$1}) { push @currentrids, $1; }
591: }
592: }
593: # rids are number.number and we want to numercially sort on
594: # the second number
595: @currentrids=sort {
596: my (undef,$aid)=split(/\./,$a);
597: my (undef,$bid)=split(/\./,$b);
598: $aid <=> $bid;
599: } @currentrids;
600: next if ($#currentrids<$rndpick);
601: # -------------------------------- randomly eliminate the ones that should stay
602: my (undef,$id)=split(/\./,$rid);
603: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
604: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
605: &Apache::lonnet::setup_random_from_rndseed($rndseed);
606: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
607: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
608: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
609: # -------------------------------------------------------- delete the leftovers
610: for (my $k=0; $k<=$#currentrids; $k++) {
611: if ($currentrids[$k]) {
612: $hash{'randomout_'.$currentrids[$k]}=1;
613: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
614: $randomoutentry.='&'.
615: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
616: $resid,
617: $hash{'src_'.$currentrids[$k]}
618: ).'&';
619: }
620: }
621: }
622: # ------------------------------ take care of explicitly hidden urls or folders
623: foreach my $rid (keys %hiddenurl) {
624: $hash{'randomout_'.$rid}=1;
625: my ($mapid,$resid)=split(/\./,$rid);
626: $randomoutentry.='&'.
627: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
628: $hash{'src_'.$rid}).'&';
629: }
630: # --------------------------------------- append randomout entry to environment
631: if ($randomoutentry) {
632: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
633: }
634: }
635:
636: # ---------------------------------------------------- Read map and all submaps
637:
638: sub readmap {
639: my $short=shift;
640: $short=~s/^\///;
641: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
642: my $fn=$cenv{'fn'};
643: my $uri;
644: $short=~s/\//\_/g;
645: unless ($uri=$cenv{'url'}) {
646: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
647: "Could not load course $short.</font>");
648: return ('',&mt('No course data available.'));;
649: }
650: @cond=('true:normal');
651:
652: open(LOCKFILE,">$fn.db.lock");
653: my $lock=0;
654: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
655: $lock=1;
656: unlink($fn.'.db');
657: unlink($fn.'_symb.db');
658: unlink($fn.'.state');
659: unlink($fn.'parms.db');
660: }
661: undef %randompick;
662: undef %hiddenurl;
663: undef %encurl;
664: $retfrid='';
665: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
666: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
667: %hash=();
668: %parmhash=();
669: $errtext='';
670: $pc=0;
671: &clear_mapalias_count();
672: &processversionfile(%cenv);
673: my $furi=&Apache::lonnet::clutter($uri);
674: $hash{'src_0.0'}=&versiontrack($furi);
675: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
676: $hash{'ids_'.$furi}='0.0';
677: $hash{'is_map_0.0'}=1;
678: loadmap($uri,'0.0');
679: if (defined($hash{'map_start_'.$uri})) {
680: &Apache::lonnet::appenv("request.course.id" => $short,
681: "request.course.fn" => $fn,
682: "request.course.uri" => $uri);
683: $env{'request.course.id'}=$short;
684: &traceroute('0',$hash{'map_start_'.$uri},'&');
685: &accinit($uri,$short,$fn);
686: &hiddenurls();
687: }
688: $errtext .= &get_mapalias_errors();
689: # ------------------------------------------------------- Put versions into src
690: foreach my $key (keys(%hash)) {
691: if ($key=~/^src_/) {
692: $hash{$key}=&putinversion($hash{$key});
693: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
694: my ($type, $url) = ($1,$2);
695: my $value = $hash{$key};
696: $hash{$type.&putinversion($url)}=$value;
697: }
698: }
699: # ---------------------------------------------------------------- Encrypt URLs
700: foreach my $id (keys(%encurl)) {
701: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
702: $hash{'encrypted_'.$id}=1;
703: }
704: # ----------------------------------------------- Close hashes to finally store
705: # --------------------------------- Routine must pass this point, no early outs
706: $hash{'first_rid'}=$retfrid;
707: my ($mapid,$resid)=split(/\./,$retfrid);
708: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
709: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
710: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
711: if ($hash{'encrypted_'.$retfrid}) {
712: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
713: }
714: $hash{'first_url'}=$retfurl;
715: unless ((untie(%hash)) && (untie(%parmhash))) {
716: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
717: "Could not untie coursemap $fn for $uri.</font>");
718: }
719: # ---------------------------------------------------- Store away initial state
720: {
721: my $cfh;
722: if (open($cfh,">$fn.state")) {
723: print $cfh join("\n",@cond);
724: } else {
725: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
726: "Could not write statemap $fn for $uri.</font>");
727: }
728: }
729: flock(LOCKFILE,LOCK_UN);
730: close(LOCKFILE);
731: } else {
732: # if we are here it is likely because we are already trying to
733: # initialize the course in another child, busy wait trying to
734: # tie the hashes for the next 90 seconds, if we succeed forward
735: # them on to navmaps, if we fail, throw up the Could not init
736: # course screen
737: if ($lock) {
738: # Got the lock but not the DB files
739: flock(LOCKFILE,LOCK_UN);
740: }
741: untie(%hash);
742: untie(%parmhash);
743: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
744: "Could not tie coursemap $fn for $uri.</font>");
745: my $i=0;
746: while($i<90) {
747: $i++;
748: sleep(1);
749: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
750: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
751: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
752: $retfurl='/adm/navmaps';
753: &Apache::lonnet::appenv("request.course.id" => $short,
754: "request.course.fn" => $fn,
755: "request.course.uri" => $uri);
756: untie(%hash);
757: untie(%parmhash);
758: last;
759: }
760: }
761: untie(%hash);
762: untie(%parmhash);
763: }
764: flock(LOCKFILE,LOCK_UN);
765: close(LOCKFILE);
766: }
767: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
768: # ------------------------------------------------- Check for critical messages
769:
770: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
771: $env{'user.name'});
772: if ($what[0]) {
773: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
774: $retfurl='/adm/email?critical=display';
775: }
776: }
777: return ($retfurl,$errtext);
778: }
779:
780: # ------------------------------------------------------- Evaluate state string
781:
782: sub evalstate {
783: my $fn=$env{'request.course.fn'}.'.state';
784: my $state='';
785: if (-e $fn) {
786: my @conditions=();
787: {
788: open(my $fh,"<$fn");
789: @conditions=<$fh>;
790: close($fh);
791: }
792: my $safeeval = new Safe;
793: my $safehole = new Safe::Hole;
794: $safeeval->permit("entereval");
795: $safeeval->permit(":base_math");
796: $safeeval->deny(":base_io");
797: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
798: foreach my $line (@conditions) {
799: chomp($line);
800: my ($condition,$weight)=split(/\:/,$line);
801: if ($safeeval->reval($condition)) {
802: if ($weight eq 'force') {
803: $state.='3';
804: } else {
805: $state.='2';
806: }
807: } else {
808: if ($weight eq 'stop') {
809: $state.='0';
810: } else {
811: $state.='1';
812: }
813: }
814: }
815: }
816: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
817: return $state;
818: }
819:
820: {
821: my %mapalias_cache;
822: sub count_mapalias {
823: my ($value,$resid) = @_;
824: push(@{ $mapalias_cache{$value} }, $resid);
825: }
826:
827: sub get_mapalias_errors {
828: my $error_text;
829: foreach my $mapalias (sort(keys(%mapalias_cache))) {
830: next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
831: my $count;
832: my $which =
833: join('</li><li>',
834: map {
835: my $id = $_;
836: if (exists($hash{'src_'.$id})) {
837: $count++;
838: }
839: my ($mapid) = split(/\./,$id);
840: &mt('Resource "[_1]" <br /> in Map "[_2]"',
841: $hash{'title_'.$id},
842: $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
843: } (@{ $mapalias_cache{$mapalias} }));
844: next if ($count < 2);
845: $error_text .= '<div class="LC_error">'.
846: &mt('Error: Found the mapalias "[_1]" defined multiple times.',
847: $mapalias).
848: '</div><ul><li>'.$which.'</li></ul>';
849: }
850: &clear_mapalias_count();
851: return $error_text;
852: }
853: sub clear_mapalias_count {
854: undef(%mapalias_cache);
855: }
856: }
857: 1;
858: __END__
859:
860: =head1 NAME
861:
862: Apache::lonuserstate - Construct and maintain state and binary representation
863: of course for user
864:
865: =head1 SYNOPSIS
866:
867: Invoked by lonroles.pm.
868:
869: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
870:
871: =head1 INTRODUCTION
872:
873: This module constructs and maintains state and binary representation
874: of course for user.
875:
876: This is part of the LearningOnline Network with CAPA project
877: described at http://www.lon-capa.org.
878:
879: =head1 HANDLER SUBROUTINE
880:
881: There is no handler subroutine.
882:
883: =head1 OTHER SUBROUTINES
884:
885: =over 4
886:
887: =item *
888:
889: loadmap() : Loads map from disk
890:
891: =item *
892:
893: simplify() : Simplify expression
894:
895: =item *
896:
897: traceroute() : Build condition hash
898:
899: =item *
900:
901: accinit() : Cascading conditions, quick access, parameters
902:
903: =item *
904:
905: readmap() : Read map and all submaps
906:
907: =item *
908:
909: evalstate() : Evaluate state string
910:
911: =back
912:
913: =cut
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