# The LearningOnline Network with CAPA
# Construct and maintain state and binary representation of course for user
#
# $Id: lonuserstate.pm,v 1.120 2007/08/28 01:06:15 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
###
package Apache::lonuserstate;
# ------------------------------------------------- modules used by this module
use strict;
use HTML::TokeParser;
use Apache::lonnet;
use Apache::lonlocal;
use Apache::loncommon();
use GDBM_File;
use Apache::lonmsg;
use Safe;
use Safe::Hole;
use Opcode;
use Apache::lonenc;
use Fcntl qw(:flock);
use LONCAPA;
# ---------------------------------------------------- Globals for this package
my $pc; # Package counter
my %hash; # The big tied hash
my %parmhash;# The hash with the parameters
my @cond; # Array with all of the conditions
my $errtext; # variable with all errors
my $retfrid; # variable with the very first RID in the course
my $retfurl; # first URL
my %randompick; # randomly picked resources
my %randompickseed; # optional seed for randomly picking resources
my %encurl; # URLs in this folder are supposed to be encrypted
my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
# ----------------------------------- Remove version from URL and store in hash
sub versiontrack {
my $uri=shift;
if ($uri=~/\.(\d+)\.\w+$/) {
my $version=$1;
$uri=~s/\.\d+\.(\w+)$/\.$1/;
unless ($hash{'version_'.$uri}) {
$hash{'version_'.$uri}=$version;
}
}
return $uri;
}
# -------------------------------------------------------------- Put in version
sub putinversion {
my $uri=shift;
my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
if ($hash{'version_'.$uri}) {
my $version=$hash{'version_'.$uri};
if ($version eq 'mostrecent') { return $uri; }
if ($version eq &Apache::lonnet::getversion(
&Apache::lonnet::filelocation('',$uri)))
{ return $uri; }
$uri=~s/\.(\w+)$/\.$version\.$1/;
}
&Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
return $uri;
}
# ----------------------------------------- Processing versions file for course
sub processversionfile {
my %cenv=@_;
my %versions=&Apache::lonnet::dump('resourceversions',
$cenv{'domain'},
$cenv{'num'});
foreach my $ver (keys(%versions)) {
if ($ver=~/^error\:/) { return; }
$hash{'version_'.$ver}=$versions{$ver};
}
}
# --------------------------------------------------------- Loads map from disk
sub loadmap {
my $uri=shift;
if ($hash{'map_pc_'.$uri}) {
$errtext.='<p class="LC_error">'.
&mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
'</p>';
return;
}
$pc++;
my $lpc=$pc;
$hash{'map_pc_'.$uri}=$lpc;
$hash{'map_id_'.$lpc}=$uri;
# Determine and check filename
my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
my $ispage=($fn=~/\.page$/);
unless (($fn=~/\.sequence$/) ||
($fn=~/\.page$/)) {
$errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
return;
}
my $instr=&Apache::lonnet::getfile($fn);
unless ($instr eq -1) {
# Successfully got file, parse it
my $parser = HTML::TokeParser->new(\$instr);
$parser->attr_encoded(1);
my $token;
my $linkpc=0;
$fn=~/\.(\w+)$/;
$hash{'map_type_'.$lpc}=$1;
while ($token = $parser->get_token) {
if ($token->[0] eq 'S') {
if ($token->[1] eq 'resource') {
# -------------------------------------------------------------------- Resource
if ($token->[2]->{'type'} eq 'zombie') { next; }
my $rid=$lpc.'.'.$token->[2]->{'id'};
$hash{'kind_'.$rid}='res';
$hash{'title_'.$rid}=$token->[2]->{'title'};
my $turi=&versiontrack($token->[2]->{'src'});
if ($token->[2]->{'version'}) {
unless ($hash{'version_'.$turi}) {
$hash{'version_'.$turi}=$1;
}
}
my $title=$token->[2]->{'title'};
$title=~s/\&colon\;/\:/gs;
# my $symb=&Apache::lonnet::encode_symb($uri,
# $token->[2]->{'id'},
# $turi);
# &Apache::lonnet::do_cache_new('title',$symb,$title);
unless ($ispage) {
$turi=~/\.(\w+)$/;
my $embstyle=&Apache::loncommon::fileembstyle($1);
if ($token->[2]->{'external'} eq 'true') { # external
$turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
} elsif ($turi=~/^\/*uploaded\//) { # uploaded
if (($embstyle eq 'img')
|| ($embstyle eq 'emb')
|| ($embstyle eq 'wrp')) {
$turi='/adm/wrapper'.$turi;
} elsif ($embstyle eq 'ssi') {
#do nothing with these
} elsif ($turi!~/\.(sequence|page)$/) {
$turi='/adm/coursedocs/showdoc'.$turi;
}
} elsif ($turi=~/\S/) { # normal non-empty internal resource
my $mapdir=$uri;
$mapdir=~s/[^\/]+$//;
$turi=&Apache::lonnet::hreflocation($mapdir,$turi);
if (($embstyle eq 'img')
|| ($embstyle eq 'emb')
|| ($embstyle eq 'wrp')) {
$turi='/adm/wrapper'.$turi;
}
}
}
# Store reverse lookup, remove query string
my $idsuri=$turi;
$idsuri=~s/\?.+$//;
if (defined($hash{'ids_'.$idsuri})) {
$hash{'ids_'.$idsuri}.=','.$rid;
} else {
$hash{'ids_'.$idsuri}=''.$rid;
}
if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
$turi.='?register=1';
}
$hash{'src_'.$rid}=$turi;
if ($token->[2]->{'external'} eq 'true') {
$hash{'ext_'.$rid}='true:';
} else {
$hash{'ext_'.$rid}='false:';
}
if ($token->[2]->{'type'}) {
$hash{'type_'.$rid}=$token->[2]->{'type'};
if ($token->[2]->{'type'} eq 'start') {
$hash{'map_start_'.$uri}="$rid";
}
if ($token->[2]->{'type'} eq 'finish') {
$hash{'map_finish_'.$uri}="$rid";
}
} else {
$hash{'type_'.$rid}='normal';
}
if (($turi=~/\.sequence$/) ||
($turi=~/\.page$/)) {
$hash{'is_map_'.$rid}=1;
&loadmap($turi);
}
} elsif ($token->[1] eq 'condition') {
# ------------------------------------------------------------------- Condition
my $rid=$lpc.'.'.$token->[2]->{'id'};
$hash{'kind_'.$rid}='cond';
$cond[$#cond+1]=$token->[2]->{'value'};
$hash{'condid_'.$rid}=$#cond;
if ($token->[2]->{'type'}) {
$cond[$#cond].=':'.$token->[2]->{'type'};
} else {
$cond[$#cond].=':normal';
}
} elsif ($token->[1] eq 'link') {
# ----------------------------------------------------------------------- Links
$linkpc++;
my $linkid=$lpc.'.'.$linkpc;
my $goesto=$lpc.'.'.$token->[2]->{'to'};
my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
my $undercond=0;
if ($token->[2]->{'condition'}) {
$undercond=$lpc.'.'.$token->[2]->{'condition'};
}
$hash{'goesto_'.$linkid}=$goesto;
$hash{'comesfrom_'.$linkid}=$comesfrom;
$hash{'undercond_'.$linkid}=$undercond;
if (defined($hash{'to_'.$comesfrom})) {
$hash{'to_'.$comesfrom}.=','.$linkid;
} else {
$hash{'to_'.$comesfrom}=''.$linkid;
}
if (defined($hash{'from_'.$goesto})) {
$hash{'from_'.$goesto}.=','.$linkid;
} else {
$hash{'from_'.$goesto}=''.$linkid;
}
} elsif ($token->[1] eq 'param') {
# ------------------------------------------------------------------- Parameter
my $referid=$lpc.'.'.$token->[2]->{'to'};
my $name=$token->[2]->{'name'};
my $part;
if ($name=~/^parameter_(.*)_/) {
$part=$1;
} else {
$part=0;
}
$name=~s/^.*_([^_]*)$/$1/;
my $newparam=
&escape($token->[2]->{'type'}).':'.
&escape($part.'.'.$name).'='.
&escape($token->[2]->{'value'});
if (defined($hash{'param_'.$referid})) {
$hash{'param_'.$referid}.='&'.$newparam;
} else {
$hash{'param_'.$referid}=''.$newparam;
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
$hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
$randompick{$referid}=$token->[2]->{'value'};
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
$randompickseed{$referid}=$token->[2]->{'value'};
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
if ($token->[2]->{'value'}=~/^yes$/i) {
$encurl{$referid}=1;
}
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
if ($token->[2]->{'value'}=~/^yes$/i) {
$hiddenurl{$referid}=1;
}
}
}
}
}
} else {
$errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
}
}
# --------------------------------------------------------- Simplify expression
sub simplify {
my $expression=shift;
# (0&1) = 1
$expression=~s/\(0\&([_\.\d]+)\)/$1/g;
# (8)=8
$expression=~s/\(([_\.\d]+)\)/$1/g;
# 8&8=8
$expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
# 8|8=8
$expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
# (5&3)&4=5&3&4
$expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
# (((5&3)|(4&6)))=((5&3)|(4&6))
$expression=~
s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
# ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
$expression=~
s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
return $expression;
}
# -------------------------------------------------------- Build condition hash
sub traceroute {
my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
my $newsofar=$sofar=simplify($sofar);
unless ($beenhere=~/\&\Q$rid\E\&/) {
$beenhere.=$rid.'&';
my ($mapid,$resid)=split(/\./,$rid);
my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
if ($hdnflag || lc($hidden) eq 'yes') {
$hiddenurl{$rid}=1;
}
if (!$hdnflag && lc($hidden) eq 'no') {
delete($hiddenurl{$rid});
}
my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
if (($retfrid eq '') && ($hash{'src_'.$rid})
&& ($hash{'src_'.$rid}!~/\.sequence$/)) {
$retfrid=$rid;
}
if (defined($hash{'conditions_'.$rid})) {
$hash{'conditions_'.$rid}=simplify(
'('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
} else {
$hash{'conditions_'.$rid}=$sofar;
}
# if the expression is just the 0th condition keep it
# otherwise leave a pointer to this condition expression
$newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
if (defined($hash{'is_map_'.$rid})) {
if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
$sofar=$newsofar=
&traceroute($sofar,
$hash{'map_start_'.$hash{'src_'.$rid}},'&',
$encflag || $encurl{$rid},
$hdnflag || $hiddenurl{$rid});
}
}
if (defined($hash{'to_'.$rid})) {
foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
my $further=$sofar;
if ($hash{'undercond_'.$id}) {
if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
$further=simplify('('.'_'.$rid.')&('.
$hash{'condid_'.$hash{'undercond_'.$id}}.')');
} else {
$errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
}
}
$newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
$encflag,$hdnflag);
}
}
}
return $newsofar;
}
# ------------------------------ Cascading conditions, quick access, parameters
sub accinit {
my ($uri,$short,$fn)=@_;
my %acchash=();
my %captured=();
my $condcounter=0;
$acchash{'acc.cond.'.$short.'.0'}=0;
foreach my $key (keys(%hash)) {
if ($key=~/^conditions/) {
my $expr=$hash{$key};
# try to find and factor out common sub-expressions
foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
my $orig=$sub;
my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
next if (!defined($factor));
$sub=~s/\Q$factor\E//g;
$sub=~s/^\(/\($factor\(/;
$sub.=')';
$sub=simplify($sub);
$expr=~s/\Q$orig\E/$sub/;
}
$hash{$key}=$expr;
unless (defined($captured{$expr})) {
$condcounter++;
$captured{$expr}=$condcounter;
$acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
}
} elsif ($key=~/^param_(\d+)\.(\d+)/) {
my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
$hash{'src_'.$1.'.'.$2});
foreach my $param (split(/\&/,$hash{$key})) {
my ($typename,$value)=split(/\=/,$param);
my ($type,$name)=split(/\:/,$typename);
$parmhash{$prefix.'.'.&unescape($name)}=
&unescape($value);
$parmhash{$prefix.'.'.&unescape($name).'.type'}=
&unescape($type);
}
}
}
foreach my $key (keys(%hash)) {
if ($key=~/^ids/) {
foreach my $resid (split(/\,/,$hash{$key})) {
my $uri=$hash{'src_'.$resid};
my ($uripath,$urifile) =
&Apache::lonnet::split_uri_for_cond($uri);
if ($uripath) {
my $uricond='0';
if (defined($hash{'conditions_'.$resid})) {
$uricond=$captured{$hash{'conditions_'.$resid}};
}
if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
/(\&\Q$urifile\E\:[^\&]*)/) {
my $replace=$1;
my $regexp=$replace;
#$regexp=~s/\|/\\\|/g;
$acchash{'acc.res.'.$short.'.'.$uripath} =~
s/\Q$regexp\E/$replace\|$uricond/;
} else {
$acchash{'acc.res.'.$short.'.'.$uripath}.=
$urifile.':'.$uricond.'&';
}
} else {
$acchash{'acc.res.'.$short.'.'.$uripath}=
'&'.$urifile.':'.$uricond.'&';
}
}
}
}
}
$acchash{'acc.res.'.$short.'.'}='&:0&';
my $courseuri=$uri;
$courseuri=~s/^\/res\///;
&Apache::lonnet::delenv('(acc\.|httpref\.)');
&Apache::lonnet::appenv(%acchash);
}
# ---------------- Selectively delete from randompick maps and hidden url parms
sub hiddenurls {
my $randomoutentry='';
foreach my $rid (keys %randompick) {
my $rndpick=$randompick{$rid};
my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
# ------------------------------------------- put existing resources into array
my @currentrids=();
foreach my $key (sort(keys(%hash))) {
if ($key=~/^src_($mpc\.\d+)/) {
if ($hash{'src_'.$1}) { push @currentrids, $1; }
}
}
# rids are number.number and we want to numercially sort on
# the second number
@currentrids=sort {
my (undef,$aid)=split(/\./,$a);
my (undef,$bid)=split(/\./,$b);
$aid <=> $bid;
} @currentrids;
next if ($#currentrids<$rndpick);
# -------------------------------- randomly eliminate the ones that should stay
my (undef,$id)=split(/\./,$rid);
if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
&Apache::lonnet::setup_random_from_rndseed($rndseed);
my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
#&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
# -------------------------------------------------------- delete the leftovers
for (my $k=0; $k<=$#currentrids; $k++) {
if ($currentrids[$k]) {
$hash{'randomout_'.$currentrids[$k]}=1;
my ($mapid,$resid)=split(/\./,$currentrids[$k]);
$randomoutentry.='&'.
&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
$resid,
$hash{'src_'.$currentrids[$k]}
).'&';
}
}
}
# ------------------------------ take care of explicitly hidden urls or folders
foreach my $rid (keys %hiddenurl) {
$hash{'randomout_'.$rid}=1;
my ($mapid,$resid)=split(/\./,$rid);
$randomoutentry.='&'.
&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
$hash{'src_'.$rid}).'&';
}
# --------------------------------------- append randomout entry to environment
if ($randomoutentry) {
&Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
}
}
# ---------------------------------------------------- Read map and all submaps
sub readmap {
my $short=shift;
$short=~s/^\///;
my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
my $fn=$cenv{'fn'};
my $uri;
$short=~s/\//\_/g;
unless ($uri=$cenv{'url'}) {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not load course $short.</font>");
return ('',&mt('No course data available.'));;
}
@cond=('true:normal');
open(LOCKFILE,">$fn.db.lock");
my $lock=0;
if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
$lock=1;
unlink($fn.'.db');
unlink($fn.'_symb.db');
unlink($fn.'.state');
unlink($fn.'parms.db');
}
undef %randompick;
undef %hiddenurl;
undef %encurl;
$retfrid='';
if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
(tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
%hash=();
%parmhash=();
$errtext='';
$pc=0;
&processversionfile(%cenv);
my $furi=&Apache::lonnet::clutter($uri);
$hash{'src_0.0'}=&versiontrack($furi);
$hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
$hash{'ids_'.$furi}='0.0';
$hash{'is_map_0.0'}=1;
loadmap($uri);
if (defined($hash{'map_start_'.$uri})) {
&Apache::lonnet::appenv("request.course.id" => $short,
"request.course.fn" => $fn,
"request.course.uri" => $uri);
$env{'request.course.id'}=$short;
&traceroute('0',$hash{'map_start_'.$uri},'&');
&accinit($uri,$short,$fn);
&hiddenurls();
}
# ------------------------------------------------------- Put versions into src
foreach my $key (keys(%hash)) {
if ($key=~/^src_/) {
$hash{$key}=&putinversion($hash{$key});
} elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
my ($type, $url) = ($1,$2);
my $value = $hash{$key};
$hash{$type.&putinversion($url)}=$value;
}
}
# ---------------------------------------------------------------- Encrypt URLs
foreach my $id (keys(%encurl)) {
# $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
$hash{'encrypted_'.$id}=1;
}
# ----------------------------------------------- Close hashes to finally store
# --------------------------------- Routine must pass this point, no early outs
$hash{'first_rid'}=$retfrid;
my ($mapid,$resid)=split(/\./,$retfrid);
$hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
$retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
if ($hash{'encrypted_'.$retfrid}) {
$retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
}
$hash{'first_url'}=$retfurl;
unless ((untie(%hash)) && (untie(%parmhash))) {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not untie coursemap $fn for $uri.</font>");
}
# ---------------------------------------------------- Store away initial state
{
my $cfh;
if (open($cfh,">$fn.state")) {
print $cfh join("\n",@cond);
} else {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not write statemap $fn for $uri.</font>");
}
}
flock(LOCKFILE,LOCK_UN);
close(LOCKFILE);
} else {
# if we are here it is likely because we are already trying to
# initialize the course in another child, busy wait trying to
# tie the hashes for the next 90 seconds, if we succeed forward
# them on to navmaps, if we fail, throw up the Could not init
# course screen
if ($lock) {
# Got the lock but not the DB files
flock(LOCKFILE,LOCK_UN);
}
untie(%hash);
untie(%parmhash);
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not tie coursemap $fn for $uri.</font>");
my $i=0;
while($i<90) {
$i++;
sleep(1);
if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
(tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
$retfurl='/adm/navmaps';
&Apache::lonnet::appenv("request.course.id" => $short,
"request.course.fn" => $fn,
"request.course.uri" => $uri);
untie(%hash);
untie(%parmhash);
last;
}
}
untie(%hash);
untie(%parmhash);
}
flock(LOCKFILE,LOCK_UN);
close(LOCKFILE);
}
&Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
# ------------------------------------------------- Check for critical messages
my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
$env{'user.name'});
if ($what[0]) {
if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
$retfurl='/adm/email?critical=display';
}
}
return ($retfurl,$errtext);
}
# ------------------------------------------------------- Evaluate state string
sub evalstate {
my $fn=$env{'request.course.fn'}.'.state';
my $state='';
if (-e $fn) {
my @conditions=();
{
open(my $fh,"<$fn");
@conditions=<$fh>;
close($fh);
}
my $safeeval = new Safe;
my $safehole = new Safe::Hole;
$safeeval->permit("entereval");
$safeeval->permit(":base_math");
$safeeval->deny(":base_io");
$safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
foreach my $line (@conditions) {
chomp($line);
my ($condition,$weight)=split(/\:/,$line);
if ($safeeval->reval($condition)) {
if ($weight eq 'force') {
$state.='3';
} else {
$state.='2';
}
} else {
if ($weight eq 'stop') {
$state.='0';
} else {
$state.='1';
}
}
}
}
&Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
return $state;
}
1;
__END__
=head1 NAME
Apache::lonuserstate - Construct and maintain state and binary representation
of course for user
=head1 SYNOPSIS
Invoked by lonroles.pm.
&Apache::lonuserstate::readmap($cdom.'/'.$cnum);
=head1 INTRODUCTION
This module constructs and maintains state and binary representation
of course for user.
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 HANDLER SUBROUTINE
There is no handler subroutine.
=head1 OTHER SUBROUTINES
=over 4
=item *
loadmap() : Loads map from disk
=item *
simplify() : Simplify expression
=item *
traceroute() : Build condition hash
=item *
accinit() : Cascading conditions, quick access, parameters
=item *
readmap() : Read map and all submaps
=item *
evalstate() : Evaluate state string
=back
=cut
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