Annotation of rat/lonuserstate.pm, revision 1.118.2.2
1.1 www 1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
1.118.2.2! albertel 4: # $Id: lonuserstate.pm,v 1.118.2.1 2007/06/08 19:33:06 albertel Exp $
1.25 www 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: #
1.26 harris41 28: ###
1.1 www 29:
30: package Apache::lonuserstate;
31:
1.26 harris41 32: # ------------------------------------------------- modules used by this module
1.1 www 33: use strict;
34: use HTML::TokeParser;
1.89 albertel 35: use Apache::lonnet;
1.114 www 36: use Apache::lonlocal;
1.26 harris41 37: use Apache::loncommon();
1.1 www 38: use GDBM_File;
1.12 www 39: use Apache::lonmsg;
1.15 www 40: use Safe;
1.21 www 41: use Safe::Hole;
1.15 www 42: use Opcode;
1.73 www 43: use Apache::lonenc;
1.96 albertel 44: use Fcntl qw(:flock);
1.114 www 45: use LONCAPA;
46:
1.15 www 47:
1.1 www 48: # ---------------------------------------------------- Globals for this package
49:
50: my $pc; # Package counter
51: my %hash; # The big tied hash
1.19 www 52: my %parmhash;# The hash with the parameters
1.1 www 53: my @cond; # Array with all of the conditions
54: my $errtext; # variable with all errors
1.116 www 55: my $retfrid; # variable with the very first RID in the course
56: my $retfurl; # first URL
1.29 www 57: my %randompick; # randomly picked resources
1.51 www 58: my %randompickseed; # optional seed for randomly picking resources
1.118.2.2! albertel 59: my %randomorder; # maps to order contents randomly
1.73 www 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
1.61 www 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: $uri=~s/\.\d+\.(\w+)$/\.$1/;
1.62 www 70: unless ($hash{'version_'.$uri}) {
71: $hash{'version_'.$uri}=$version;
72: }
1.61 www 73: }
74: return $uri;
75: }
76:
77: # -------------------------------------------------------------- Put in version
78:
79: sub putinversion {
80: my $uri=shift;
1.93 www 81: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
1.61 www 82: if ($hash{'version_'.$uri}) {
83: my $version=$hash{'version_'.$uri};
1.65 www 84: if ($version eq 'mostrecent') { return $uri; }
1.66 www 85: if ($version eq &Apache::lonnet::getversion(
86: &Apache::lonnet::filelocation('',$uri)))
87: { return $uri; }
1.61 www 88: $uri=~s/\.(\w+)$/\.$version\.$1/;
89: }
1.93 www 90: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
1.61 www 91: return $uri;
92: }
93:
94: # ----------------------------------------- Processing versions file for course
95:
96: sub processversionfile {
1.64 www 97: my %cenv=@_;
1.61 www 98: my %versions=&Apache::lonnet::dump('resourceversions',
99: $cenv{'domain'},
100: $cenv{'num'});
1.106 albertel 101: foreach my $ver (keys(%versions)) {
102: if ($ver=~/^error\:/) { return; }
103: $hash{'version_'.$ver}=$versions{$ver};
1.61 www 104: }
105: }
1.45 www 106:
1.1 www 107: # --------------------------------------------------------- Loads map from disk
108:
109: sub loadmap {
1.118.2.2! albertel 110: my ($uri,$parent_rid)=@_;
1.114 www 111: if ($hash{'map_pc_'.$uri}) {
112: $errtext.=&mt('<br />Multiple use of sequence/page <tt>[_1]</tt>! The course will not function properly.',$uri);
113: return;
114: }
1.1 www 115: $pc++;
116: my $lpc=$pc;
117: $hash{'map_pc_'.$uri}=$lpc;
118: $hash{'map_id_'.$lpc}=$uri;
119:
1.37 www 120: # Determine and check filename
1.62 www 121: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
1.37 www 122:
123: my $ispage=($fn=~/\.page$/);
1.1 www 124:
1.10 www 125: unless (($fn=~/\.sequence$/) ||
1.1 www 126: ($fn=~/\.page$/)) {
1.114 www 127: $errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
1.98 albertel 128: return;
1.1 www 129: }
130:
1.37 www 131: my $instr=&Apache::lonnet::getfile($fn);
132:
1.118.2.1 albertel 133: if ($instr eq -1) {
134: $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
135: return;
136: }
1.22 www 137:
1.37 www 138: # Successfully got file, parse it
1.1 www 139:
1.118.2.1 albertel 140: my $parser = HTML::TokeParser->new(\$instr);
141: $parser->attr_encoded(1);
1.118.2.2! albertel 142: # first get all parameters
! 143: while (my $token = $parser->get_token) {
! 144: next if ($token->[0] ne 'S');
! 145: if ($token->[1] eq 'param') {
! 146: &parse_param($token,$lpc);
! 147: }
! 148: }
! 149: #reset parser
! 150: $parser = HTML::TokeParser->new(\$instr);
! 151: $parser->attr_encoded(1);
1.1 www 152:
1.118.2.1 albertel 153: my $linkpc=0;
1.1 www 154:
1.118.2.1 albertel 155: $fn=~/\.(\w+)$/;
1.1 www 156:
1.118.2.1 albertel 157: $hash{'map_type_'.$lpc}=$1;
1.1 www 158:
1.118.2.2! albertel 159: my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
! 160:
1.118.2.1 albertel 161: my @map_ids;
162: while (my $token = $parser->get_token) {
163: next if ($token->[0] ne 'S');
164: if ($token->[1] eq 'resource') {
165: push(@map_ids,&parse_resource($token,$lpc,$ispage,$uri));
166: } elsif ($token->[1] eq 'link' && !$randomize) {
167: # ----------------------------------------------------------------------- Links
168: &make_link(++$linkpc,$lpc,$token->[2]->{'to'},
169: $token->[2]->{'from'},
170: $token->[2]->{'condition'});
171: } elsif ($token->[1] eq 'condition' && !$randomize) {
172: &parse_condition($token,$lpc);
1.118.2.2! albertel 173: }
1.118.2.1 albertel 174: }
175:
176: if ($randomize) {
1.118.2.2! albertel 177: my $seed = (split(/\./,$parent_rid))[1];
! 178: if ($randompickseed{$parent_rid}) {
! 179: $seed = $randompickseed{$parent_rid};
! 180: }
! 181: my $rndseed=&Apache::lonnet::rndseed($seed);
! 182: &Apache::lonnet::setup_random_from_rndseed($rndseed);
1.118.2.1 albertel 183: my @map_ids=&Math::Random::random_permutation(@map_ids);
184: my $from = shift(@map_ids);
185: my $from_rid = $lpc.'.'.$from;
186: $hash{'map_start_'.$uri} = $from_rid;
187: $hash{'type_'.$from_rid}='start';
188:
189: while (my $to = shift(@map_ids)) {
190: &make_link(++$linkpc,$lpc,$to,$from);
191: my $to_rid = $lpc.'.'.$to;
192: $hash{'type_'.$to_rid}='normal';
193: $from = $to;
194: $from_rid = $to_rid;
195: }
1.53 www 196:
1.118.2.1 albertel 197: $hash{'map_finish_'.$uri}= $from_rid;
198: $hash{'type_'.$from_rid}='finish';
199: }
200: }
1.1 www 201:
202:
1.118.2.1 albertel 203: # -------------------------------------------------------------------- Resource
204: sub parse_resource {
205: my ($token,$lpc,$ispage,$uri) = @_;
206: if ($token->[2]->{'type'} eq 'zombie') { next; }
207: my $rid=$lpc.'.'.$token->[2]->{'id'};
208:
209: $hash{'kind_'.$rid}='res';
210: $hash{'title_'.$rid}=$token->[2]->{'title'};
211: my $turi=&versiontrack($token->[2]->{'src'});
212: if ($token->[2]->{'version'}) {
213: unless ($hash{'version_'.$turi}) {
214: $hash{'version_'.$turi}=$1;
215: }
216: }
217: my $title=$token->[2]->{'title'};
218: $title=~s/\&colon\;/\:/gs;
219: # my $symb=&Apache::lonnet::encode_symb($uri,
220: # $token->[2]->{'id'},
221: # $turi);
222: # &Apache::lonnet::do_cache_new('title',$symb,$title);
223: unless ($ispage) {
224: $turi=~/\.(\w+)$/;
225: my $embstyle=&Apache::loncommon::fileembstyle($1);
226: if ($token->[2]->{'external'} eq 'true') { # external
227: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
228: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
229: if (($embstyle eq 'img')
230: || ($embstyle eq 'emb')
231: || ($embstyle eq 'wrp')) {
232: $turi='/adm/wrapper'.$turi;
233: } elsif ($embstyle eq 'ssi') {
234: #do nothing with these
235: } elsif ($turi!~/\.(sequence|page)$/) {
236: $turi='/adm/coursedocs/showdoc'.$turi;
237: }
238: } elsif ($turi=~/\S/) { # normal non-empty internal resource
239: my $mapdir=$uri;
240: $mapdir=~s/[^\/]+$//;
241: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
242: if (($embstyle eq 'img')
243: || ($embstyle eq 'emb')
244: || ($embstyle eq 'wrp')) {
245: $turi='/adm/wrapper'.$turi;
246: }
247: }
248: }
249: # Store reverse lookup, remove query string
250: my $idsuri=$turi;
251: $idsuri=~s/\?.+$//;
252: if (defined($hash{'ids_'.$idsuri})) {
253: $hash{'ids_'.$idsuri}.=','.$rid;
254: } else {
255: $hash{'ids_'.$idsuri}=''.$rid;
256: }
257:
258: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
259: $turi.='?register=1';
260: }
261:
262: $hash{'src_'.$rid}=$turi;
263:
264: if ($token->[2]->{'external'} eq 'true') {
265: $hash{'ext_'.$rid}='true:';
266: } else {
267: $hash{'ext_'.$rid}='false:';
268: }
269: if ($token->[2]->{'type'}) {
270: $hash{'type_'.$rid}=$token->[2]->{'type'};
271: if ($token->[2]->{'type'} eq 'start') {
272: $hash{'map_start_'.$uri}="$rid";
273: }
274: if ($token->[2]->{'type'} eq 'finish') {
275: $hash{'map_finish_'.$uri}="$rid";
276: }
277: } else {
278: $hash{'type_'.$rid}='normal';
279: }
280:
281: if (($turi=~/\.sequence$/) ||
282: ($turi=~/\.page$/)) {
283: $hash{'is_map_'.$rid}=1;
1.118.2.2! albertel 284: &loadmap($turi,$rid);
1.118.2.1 albertel 285: }
286: return $token->[2]->{'id'};
287: }
1.1 www 288:
1.118.2.1 albertel 289: sub make_link {
290: my ($linkpc,$lpc,$to,$from,$condition) = @_;
291:
292: my $linkid=$lpc.'.'.$linkpc;
293: my $goesto=$lpc.'.'.$to;
294: my $comesfrom=$lpc.'.'.$from;
295: my $undercond=0;
296:
297: if ($condition) {
298: $undercond=$lpc.'.'.$condition;
299: }
300:
301: $hash{'goesto_'.$linkid}=$goesto;
302: $hash{'comesfrom_'.$linkid}=$comesfrom;
303: $hash{'undercond_'.$linkid}=$undercond;
1.1 www 304:
1.118.2.1 albertel 305: if (defined($hash{'to_'.$comesfrom})) {
306: $hash{'to_'.$comesfrom}.=','.$linkid;
307: } else {
308: $hash{'to_'.$comesfrom}=''.$linkid;
309: }
310: if (defined($hash{'from_'.$goesto})) {
311: $hash{'from_'.$goesto}.=','.$linkid;
312: } else {
313: $hash{'from_'.$goesto}=''.$linkid;
314: }
315: }
1.1 www 316:
1.118.2.1 albertel 317: # ------------------------------------------------------------------- Condition
318: sub parse_condition {
319: my ($token,$lpc) = @_;
320: my $rid=$lpc.'.'.$token->[2]->{'id'};
321:
322: $hash{'kind_'.$rid}='cond';
323: $cond[$#cond+1]=$token->[2]->{'value'};
324: $hash{'condid_'.$rid}=$#cond;
325: if ($token->[2]->{'type'}) {
326: $cond[$#cond].=':'.$token->[2]->{'type'};
327: } else {
328: $cond[$#cond].=':normal';
329: }
330: }
1.1 www 331:
1.18 www 332: # ------------------------------------------------------------------- Parameter
333:
1.118.2.1 albertel 334: sub parse_param {
335: my ($token,$lpc) = @_;
336: my $referid=$lpc.'.'.$token->[2]->{'to'};
337: my $name=$token->[2]->{'name'};
338: my $part;
339: if ($name=~/^parameter_(.*)_/) {
340: $part=$1;
1.1 www 341: } else {
1.118.2.1 albertel 342: $part=0;
343: }
344: $name=~s/^.*_([^_]*)$/$1/;
345: my $newparam=
346: &escape($token->[2]->{'type'}).':'.
347: &escape($part.'.'.$name).'='.
348: &escape($token->[2]->{'value'});
349: if (defined($hash{'param_'.$referid})) {
350: $hash{'param_'.$referid}.='&'.$newparam;
351: } else {
352: $hash{'param_'.$referid}=''.$newparam;
353: }
354: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
355: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
356: }
357: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
358: $randompick{$referid}=$token->[2]->{'value'};
359: }
360: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
1.118.2.2! albertel 361: $randompickseed{$referid}=$token->[2]->{'value'};
! 362: }
! 363: if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) {
! 364: $randomorder{$referid}=$token->[2]->{'value'};
! 365: &Apache::lonnet::logthis("roing $referid ".$randomorder{$referid});
1.118.2.1 albertel 366: }
367: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
368: if ($token->[2]->{'value'}=~/^yes$/i) {
369: $encurl{$referid}=1;
370: }
371: }
372: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
373: if ($token->[2]->{'value'}=~/^yes$/i) {
374: $hiddenurl{$referid}=1;
375: }
1.1 www 376: }
377: }
378:
1.3 www 379: # --------------------------------------------------------- Simplify expression
380:
381: sub simplify {
1.85 albertel 382: my $expression=shift;
1.101 albertel 383: # (0&1) = 1
1.105 albertel 384: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
1.3 www 385: # (8)=8
1.105 albertel 386: $expression=~s/\(([_\.\d]+)\)/$1/g;
1.3 www 387: # 8&8=8
1.105 albertel 388: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
1.3 www 389: # 8|8=8
1.105 albertel 390: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
1.3 www 391: # (5&3)&4=5&3&4
1.105 albertel 392: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
1.3 www 393: # (((5&3)|(4&6)))=((5&3)|(4&6))
1.105 albertel 394: $expression=~
395: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
1.3 www 396: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
1.85 albertel 397: $expression=~
1.105 albertel 398: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
1.85 albertel 399: return $expression;
1.3 www 400: }
401:
1.2 www 402: # -------------------------------------------------------- Build condition hash
403:
404: sub traceroute {
1.77 www 405: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
1.81 albertel 406: my $newsofar=$sofar=simplify($sofar);
1.2 www 407: unless ($beenhere=~/\&$rid\&/) {
1.85 albertel 408: $beenhere.=$rid.'&';
409: my ($mapid,$resid)=split(/\./,$rid);
410: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
411: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
1.91 albertel 412:
1.90 albertel 413: if ($hdnflag || lc($hidden) eq 'yes') {
414: $hiddenurl{$rid}=1;
1.91 albertel 415: }
416: if (!$hdnflag && lc($hidden) eq 'no') {
1.90 albertel 417: delete($hiddenurl{$rid});
418: }
1.91 albertel 419:
1.85 albertel 420: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
421: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
1.116 www 422: if (($retfrid eq '') && ($hash{'src_'.$rid})
1.85 albertel 423: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
1.116 www 424: $retfrid=$rid;
1.85 albertel 425: }
426: if (defined($hash{'conditions_'.$rid})) {
427: $hash{'conditions_'.$rid}=simplify(
1.103 albertel 428: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1.85 albertel 429: } else {
430: $hash{'conditions_'.$rid}=$sofar;
431: }
1.107 albertel 432:
433: # if the expression is just the 0th condition keep it
434: # otherwise leave a pointer to this condition expression
435: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
436:
1.85 albertel 437: if (defined($hash{'is_map_'.$rid})) {
438: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
439: $sofar=$newsofar=
440: &traceroute($sofar,
441: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
442: $encflag || $encurl{$rid},
443: $hdnflag || $hiddenurl{$rid});
444: }
445: }
446: if (defined($hash{'to_'.$rid})) {
1.106 albertel 447: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.2 www 448: my $further=$sofar;
1.106 albertel 449: if ($hash{'undercond_'.$id}) {
450: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
1.105 albertel 451: $further=simplify('('.'_'.$rid.')&('.
1.106 albertel 452: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
1.85 albertel 453: } else {
1.114 www 454: $errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
1.85 albertel 455: }
1.2 www 456: }
1.106 albertel 457: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
1.81 albertel 458: $encflag,$hdnflag);
1.85 albertel 459: }
460: }
1.2 www 461: }
1.81 albertel 462: return $newsofar;
1.2 www 463: }
1.1 www 464:
1.19 www 465: # ------------------------------ Cascading conditions, quick access, parameters
1.4 www 466:
467: sub accinit {
468: my ($uri,$short,$fn)=@_;
469: my %acchash=();
470: my %captured=();
471: my $condcounter=0;
1.5 www 472: $acchash{'acc.cond.'.$short.'.0'}=0;
1.104 albertel 473: foreach my $key (keys(%hash)) {
474: if ($key=~/^conditions/) {
475: my $expr=$hash{$key};
1.109 albertel 476: # try to find and factor out common sub-expressions
1.105 albertel 477: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
1.104 albertel 478: my $orig=$sub;
1.109 albertel 479:
480: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
481: next if (!defined($factor));
482:
483: $sub=~s/\Q$factor\E//g;
1.85 albertel 484: $sub=~s/^\(/\($factor\(/;
485: $sub.=')';
486: $sub=simplify($sub);
1.109 albertel 487: $expr=~s/\Q$orig\E/$sub/;
1.85 albertel 488: }
1.104 albertel 489: $hash{$key}=$expr;
1.85 albertel 490: unless (defined($captured{$expr})) {
491: $condcounter++;
492: $captured{$expr}=$condcounter;
493: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
494: }
1.104 albertel 495: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
1.86 albertel 496: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
497: $hash{'src_'.$1.'.'.$2});
1.104 albertel 498: foreach my $param (split(/\&/,$hash{$key})) {
499: my ($typename,$value)=split(/\=/,$param);
1.85 albertel 500: my ($type,$name)=split(/\:/,$typename);
1.114 www 501: $parmhash{$prefix.'.'.&unescape($name)}=
502: &unescape($value);
503: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
504: &unescape($type);
1.85 albertel 505: }
506: }
1.26 harris41 507: }
1.104 albertel 508: foreach my $key (keys(%hash)) {
509: if ($key=~/^ids/) {
510: foreach my $resid (split(/\,/,$hash{$key})) {
1.85 albertel 511: my $uri=$hash{'src_'.$resid};
1.100 albertel 512: my ($uripath,$urifile) =
513: &Apache::lonnet::split_uri_for_cond($uri);
1.85 albertel 514: if ($uripath) {
515: my $uricond='0';
516: if (defined($hash{'conditions_'.$resid})) {
517: $uricond=$captured{$hash{'conditions_'.$resid}};
518: }
519: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
520: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
521: /(\&\Q$urifile\E\:[^\&]*)/) {
522: my $replace=$1;
523: my $regexp=$replace;
524: #$regexp=~s/\|/\\\|/g;
1.105 albertel 525: $acchash{'acc.res.'.$short.'.'.$uripath} =~
1.104 albertel 526: s/\Q$regexp\E/$replace\|$uricond/;
1.85 albertel 527: } else {
528: $acchash{'acc.res.'.$short.'.'.$uripath}.=
529: $urifile.':'.$uricond.'&';
530: }
531: } else {
532: $acchash{'acc.res.'.$short.'.'.$uripath}=
533: '&'.$urifile.':'.$uricond.'&';
534: }
535: }
536: }
537: }
1.26 harris41 538: }
1.24 www 539: $acchash{'acc.res.'.$short.'.'}='&:0&';
1.8 www 540: my $courseuri=$uri;
541: $courseuri=~s/^\/res\///;
1.19 www 542: &Apache::lonnet::delenv('(acc\.|httpref\.)');
1.79 albertel 543: &Apache::lonnet::appenv(%acchash);
1.4 www 544: }
545:
1.73 www 546: # ---------------- Selectively delete from randompick maps and hidden url parms
1.29 www 547:
1.73 www 548: sub hiddenurls {
1.31 www 549: my $randomoutentry='';
1.29 www 550: foreach my $rid (keys %randompick) {
551: my $rndpick=$randompick{$rid};
552: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
553: # ------------------------------------------- put existing resources into array
554: my @currentrids=();
1.106 albertel 555: foreach my $key (sort(keys(%hash))) {
556: if ($key=~/^src_($mpc\.\d+)/) {
1.29 www 557: if ($hash{'src_'.$1}) { push @currentrids, $1; }
558: }
559: }
1.50 albertel 560: # rids are number.number and we want to numercially sort on
561: # the second number
562: @currentrids=sort {
563: my (undef,$aid)=split(/\./,$a);
564: my (undef,$bid)=split(/\./,$b);
565: $aid <=> $bid;
566: } @currentrids;
1.29 www 567: next if ($#currentrids<$rndpick);
568: # -------------------------------- randomly eliminate the ones that should stay
1.50 albertel 569: my (undef,$id)=split(/\./,$rid);
1.51 www 570: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
1.50 albertel 571: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
1.58 albertel 572: &Apache::lonnet::setup_random_from_rndseed($rndseed);
1.50 albertel 573: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
574: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
575: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
1.29 www 576: # -------------------------------------------------------- delete the leftovers
577: for (my $k=0; $k<=$#currentrids; $k++) {
578: if ($currentrids[$k]) {
579: $hash{'randomout_'.$currentrids[$k]}=1;
1.32 www 580: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
581: $randomoutentry.='&'.
1.86 albertel 582: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
583: $resid,
584: $hash{'src_'.$currentrids[$k]}
585: ).'&';
1.29 www 586: }
587: }
1.31 www 588: }
1.73 www 589: # ------------------------------ take care of explicitly hidden urls or folders
590: foreach my $rid (keys %hiddenurl) {
591: $hash{'randomout_'.$rid}=1;
592: my ($mapid,$resid)=split(/\./,$rid);
593: $randomoutentry.='&'.
1.86 albertel 594: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
595: $hash{'src_'.$rid}).'&';
1.73 www 596: }
597: # --------------------------------------- append randomout entry to environment
1.31 www 598: if ($randomoutentry) {
599: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
1.29 www 600: }
601: }
602:
1.1 www 603: # ---------------------------------------------------- Read map and all submaps
604:
605: sub readmap {
1.85 albertel 606: my $short=shift;
607: $short=~s/^\///;
1.108 albertel 608: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
1.85 albertel 609: my $fn=$cenv{'fn'};
610: my $uri;
611: $short=~s/\//\_/g;
612: unless ($uri=$cenv{'url'}) {
613: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
614: "Could not load course $short.</font>");
1.114 www 615: return ('',&mt('No course data available.'));;
1.85 albertel 616: }
617: @cond=('true:normal');
1.96 albertel 618:
619: open(LOCKFILE,">$fn.db.lock");
620: my $lock=0;
621: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
622: $lock=1;
623: unlink($fn.'.db');
624: unlink($fn.'_symb.db');
625: unlink($fn.'.state');
626: unlink($fn.'parms.db');
627: }
1.85 albertel 628: undef %randompick;
629: undef %hiddenurl;
630: undef %encurl;
1.116 www 631: $retfrid='';
1.96 albertel 632: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
1.85 albertel 633: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
634: %hash=();
635: %parmhash=();
636: $errtext='';
637: $pc=0;
638: &processversionfile(%cenv);
639: my $furi=&Apache::lonnet::clutter($uri);
640: $hash{'src_0.0'}=&versiontrack($furi);
641: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
642: $hash{'ids_'.$furi}='0.0';
643: $hash{'is_map_0.0'}=1;
1.118.2.2! albertel 644: loadmap($uri,'0.0');
1.85 albertel 645: if (defined($hash{'map_start_'.$uri})) {
646: &Apache::lonnet::appenv("request.course.id" => $short,
647: "request.course.fn" => $fn,
648: "request.course.uri" => $uri);
1.116 www 649: $env{'request.course.id'}=$short;
1.85 albertel 650: &traceroute('0',$hash{'map_start_'.$uri},'&');
651: &accinit($uri,$short,$fn);
652: &hiddenurls();
653: }
1.62 www 654: # ------------------------------------------------------- Put versions into src
1.106 albertel 655: foreach my $key (keys(%hash)) {
1.110 albertel 656: if ($key=~/^src_/) {
1.106 albertel 657: $hash{$key}=&putinversion($hash{$key});
1.110 albertel 658: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
659: my ($type, $url) = ($1,$2);
660: my $value = $hash{$key};
661: $hash{$type.&putinversion($url)}=$value;
1.85 albertel 662: }
1.61 www 663: }
1.74 www 664: # ---------------------------------------------------------------- Encrypt URLs
1.106 albertel 665: foreach my $id (keys(%encurl)) {
666: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
667: $hash{'encrypted_'.$id}=1;
1.85 albertel 668: }
1.74 www 669: # ----------------------------------------------- Close hashes to finally store
670: # --------------------------------- Routine must pass this point, no early outs
1.116 www 671: $hash{'first_rid'}=$retfrid;
672: my ($mapid,$resid)=split(/\./,$retfrid);
673: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
674: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
675: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
676: if ($hash{'encrypted_'.$retfrid}) {
677: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
678: }
1.94 albertel 679: $hash{'first_url'}=$retfurl;
1.85 albertel 680: unless ((untie(%hash)) && (untie(%parmhash))) {
681: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
682: "Could not untie coursemap $fn for $uri.</font>");
683: }
684: # ---------------------------------------------------- Store away initial state
685: {
686: my $cfh;
1.88 raeburn 687: if (open($cfh,">$fn.state")) {
1.85 albertel 688: print $cfh join("\n",@cond);
689: } else {
690: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
691: "Could not write statemap $fn for $uri.</font>");
692: }
1.96 albertel 693: }
694: flock(LOCKFILE,LOCK_UN);
695: close(LOCKFILE);
1.85 albertel 696: } else {
1.87 albertel 697: # if we are here it is likely because we are already trying to
698: # initialize the course in another child, busy wait trying to
699: # tie the hashes for the next 90 seconds, if we succeed forward
700: # them on to navmaps, if we fail, throw up the Could not init
701: # course screen
1.96 albertel 702: if ($lock) {
703: # Got the lock but not the DB files
704: flock(LOCKFILE,LOCK_UN);
705: }
1.87 albertel 706: untie(%hash);
707: untie(%parmhash);
1.85 albertel 708: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
709: "Could not tie coursemap $fn for $uri.</font>");
1.87 albertel 710: my $i=0;
711: while($i<90) {
712: $i++;
713: sleep(1);
1.96 albertel 714: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
715: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
1.87 albertel 716: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
717: $retfurl='/adm/navmaps';
718: &Apache::lonnet::appenv("request.course.id" => $short,
719: "request.course.fn" => $fn,
720: "request.course.uri" => $uri);
721: untie(%hash);
722: untie(%parmhash);
723: last;
724: }
725: }
726: untie(%hash);
727: untie(%parmhash);
728: }
1.96 albertel 729: flock(LOCKFILE,LOCK_UN);
730: close(LOCKFILE);
1.1 www 731: }
1.89 albertel 732: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
1.46 www 733: # ------------------------------------------------- Check for critical messages
734:
1.89 albertel 735: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
736: $env{'user.name'});
1.46 www 737: if ($what[0]) {
738: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
739: $retfurl='/adm/email?critical=display';
740: }
741: }
1.85 albertel 742: return ($retfurl,$errtext);
1.1 www 743: }
1.15 www 744:
745: # ------------------------------------------------------- Evaluate state string
746:
747: sub evalstate {
1.89 albertel 748: my $fn=$env{'request.course.fn'}.'.state';
1.80 albertel 749: my $state='';
1.15 www 750: if (-e $fn) {
1.80 albertel 751: my @conditions=();
752: {
1.115 raeburn 753: open(my $fh,"<$fn");
1.80 albertel 754: @conditions=<$fh>;
1.115 raeburn 755: close($fh);
1.80 albertel 756: }
757: my $safeeval = new Safe;
758: my $safehole = new Safe::Hole;
759: $safeeval->permit("entereval");
760: $safeeval->permit(":base_math");
761: $safeeval->deny(":base_io");
762: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
763: foreach my $line (@conditions) {
764: chomp($line);
765: my ($condition,$weight)=split(/\:/,$line);
766: if ($safeeval->reval($condition)) {
767: if ($weight eq 'force') {
768: $state.='3';
769: } else {
770: $state.='2';
771: }
772: } else {
773: if ($weight eq 'stop') {
774: $state.='0';
775: } else {
776: $state.='1';
777: }
778: }
779: }
1.15 www 780: }
1.89 albertel 781: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
1.15 www 782: return $state;
783: }
784:
1.1 www 785: 1;
786: __END__
787:
1.26 harris41 788: =head1 NAME
789:
790: Apache::lonuserstate - Construct and maintain state and binary representation
791: of course for user
792:
793: =head1 SYNOPSIS
794:
795: Invoked by lonroles.pm.
796:
797: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
798:
799: =head1 INTRODUCTION
800:
801: This module constructs and maintains state and binary representation
802: of course for user.
803:
804: This is part of the LearningOnline Network with CAPA project
805: described at http://www.lon-capa.org.
806:
807: =head1 HANDLER SUBROUTINE
808:
809: There is no handler subroutine.
810:
811: =head1 OTHER SUBROUTINES
812:
813: =over 4
814:
815: =item *
816:
817: loadmap() : Loads map from disk
818:
819: =item *
820:
821: simplify() : Simplify expression
822:
823: =item *
824:
825: traceroute() : Build condition hash
826:
827: =item *
828:
829: accinit() : Cascading conditions, quick access, parameters
1.1 www 830:
1.26 harris41 831: =item *
1.1 www 832:
1.26 harris41 833: readmap() : Read map and all submaps
1.1 www 834:
1.26 harris41 835: =item *
1.1 www 836:
1.26 harris41 837: evalstate() : Evaluate state string
1.1 www 838:
1.26 harris41 839: =back
1.1 www 840:
1.26 harris41 841: =cut
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