# The LearningOnline Network with CAPA # Construct and maintain state and binary representation of course for user # # $Id: lonuserstate.pm,v 1.128 2008/03/12 02:45:50 raeburn 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 %randomorder; # maps to order contents randomly 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 ($uri,$parent_rid)=@_; if ($hash{'map_pc_'.$uri}) { $errtext.='

'. &mt('Multiple use of sequence/page [_1]! The course will not function properly.',''.$uri.''). '

'; 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$/)) { $errtext.=&mt("
Invalid map: [_1]",$fn); return; } my $instr=&Apache::lonnet::getfile($fn); if ($instr eq -1) { $errtext.=&mt('
Map not loaded: The file [_1] does not exist.',$fn); return; } # Successfully got file, parse it my $parser = HTML::TokeParser->new(\$instr); $parser->attr_encoded(1); # first get all parameters while (my $token = $parser->get_token) { next if ($token->[0] ne 'S'); if ($token->[1] eq 'param') { &parse_param($token,$lpc); } } #reset parser $parser = HTML::TokeParser->new(\$instr); $parser->attr_encoded(1); my $linkpc=0; $fn=~/\.(\w+)$/; $hash{'map_type_'.$lpc}=$1; my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i); my @map_ids; while (my $token = $parser->get_token) { next if ($token->[0] ne 'S'); if ($token->[1] eq 'resource') { push(@map_ids,&parse_resource($token,$lpc,$ispage,$uri)); } elsif ($token->[1] eq 'link' && !$randomize) { # ----------------------------------------------------------------------- Links &make_link(++$linkpc,$lpc,$token->[2]->{'to'}, $token->[2]->{'from'}, $token->[2]->{'condition'}); } elsif ($token->[1] eq 'condition' && !$randomize) { &parse_condition($token,$lpc); } } if ($randomize) { if (!$env{'request.role.adv'}) { my $seed; if (defined($randompickseed{$parent_rid})) { $seed = $randompickseed{$parent_rid}; } else { my ($mapid,$resid)=split(/\./,$parent_rid); my $symb= &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, $resid,$hash{'src_'.$parent_rid}); $seed = $symb; } my $rndseed=&Apache::lonnet::rndseed($seed); &Apache::lonnet::setup_random_from_rndseed($rndseed); @map_ids=&Math::Random::random_permutation(@map_ids); } my $from = shift(@map_ids); my $from_rid = $lpc.'.'.$from; $hash{'map_start_'.$uri} = $from_rid; $hash{'type_'.$from_rid}='start'; while (my $to = shift(@map_ids)) { &make_link(++$linkpc,$lpc,$to,$from); my $to_rid = $lpc.'.'.$to; $hash{'type_'.$to_rid}='normal'; $from = $to; $from_rid = $to_rid; } $hash{'map_finish_'.$uri}= $from_rid; $hash{'type_'.$from_rid}='finish'; } $parser = HTML::TokeParser->new(\$instr); $parser->attr_encoded(1); # last parse out the mapalias params so as to ignore anything # refering to non-existant resources while (my $token = $parser->get_token) { next if ($token->[0] ne 'S'); if ($token->[1] eq 'param') { &parse_mapalias_param($token,$lpc); } } } # -------------------------------------------------------------------- Resource sub parse_resource { my ($token,$lpc,$ispage,$uri) = @_; if ($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($turi,$rid); } return $token->[2]->{'id'}; } sub make_link { my ($linkpc,$lpc,$to,$from,$condition) = @_; my $linkid=$lpc.'.'.$linkpc; my $goesto=$lpc.'.'.$to; my $comesfrom=$lpc.'.'.$from; my $undercond=0; if ($condition) { $undercond=$lpc.'.'.$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}=''.$linkid; } } # ------------------------------------------------------------------- Condition sub parse_condition { my ($token,$lpc) = @_; my $rid=$lpc.'.'.$token->[2]->{'id'}; $hash{'kind_'.$rid}='cond'; my $condition = $token->[2]->{'value'}; $condition =~ s/[\n\r]+/ /gs; push(@cond, $condition); $hash{'condid_'.$rid}=$#cond; if ($token->[2]->{'type'}) { $cond[$#cond].=':'.$token->[2]->{'type'}; } else { $cond[$#cond].=':normal'; } } # ------------------------------------------------------------------- Parameter sub parse_param { my ($token,$lpc) = @_; 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_)*randompick$/) { $randompick{$referid}=$token->[2]->{'value'}; } if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { $randompickseed{$referid}=$token->[2]->{'value'}; } if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) { $randomorder{$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; } } } sub parse_mapalias_param { my ($token,$lpc) = @_; my $referid=$lpc.'.'.$token->[2]->{'to'}; return if (!exists($hash{'src_'.$referid})); if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) { &count_mapalias($token->[2]->{'value'},$referid); $hash{'mapalias_'.$token->[2]->{'value'}}=$referid; } } # --------------------------------------------------------- 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}}, $beenhere, $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 { $errtext.=&mt('
Undefined condition ID: [_1]',$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("WARNING: ". "Could not load course $short."); return ('',&mt('No course data available.'));; } @cond=('true:normal'); open(LOCKFILE,">$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; &clear_mapalias_count(); &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,'0.0'); 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(); } $errtext .= &get_mapalias_errors(); # ------------------------------------------------------- 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("WARNING: ". "Could not untie coursemap $fn for $uri."); } # ---------------------------------------------------- Store away initial state { my $cfh; if (open($cfh,">$fn.state")) { print $cfh join("\n",@cond); } else { &Apache::lonnet::logthis("WARNING: ". "Could not write statemap $fn for $uri."); } } flock(LOCKFILE,LOCK_UN); close(LOCKFILE); } else { # if we are here it is likely because we are already trying to # initialize the course in another child, busy wait trying to # tie the hashes for the next 90 seconds, if we succeed forward # them on to navmaps, if we fail, throw up the Could not init # course screen if ($lock) { # Got the lock but not the DB files flock(LOCKFILE,LOCK_UN); } untie(%hash); untie(%parmhash); &Apache::lonnet::logthis("WARNING: ". "Could not tie coursemap $fn for $uri."); 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 $state; } { my %mapalias_cache; sub count_mapalias { my ($value,$resid) = @_; push(@{ $mapalias_cache{$value} }, $resid); } sub get_mapalias_errors { my $error_text; foreach my $mapalias (sort(keys(%mapalias_cache))) { next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1); my $count; my $which = join('
  • ', map { my $id = $_; if (exists($hash{'src_'.$id})) { $count++; } my ($mapid) = split(/\./,$id); &mt('Resource "[_1]"
    in Map "[_2]"', $hash{'title_'.$id}, $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}}); } (@{ $mapalias_cache{$mapalias} })); next if ($count < 2); $error_text .= '
    '. &mt('Error: Found the mapalias "[_1]" defined multiple times.', $mapalias). '
    '; } &clear_mapalias_count(); return $error_text; } sub clear_mapalias_count { undef(%mapalias_cache); } } 1; __END__ =head1 NAME Apache::lonuserstate - Construct and maintain state and binary representation of course for user =head1 SYNOPSIS Invoked by lonroles.pm. &Apache::lonuserstate::readmap($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