Annotation of rat/lonuserstate.pm, revision 1.135

1.1       www         1: # The LearningOnline Network with CAPA
                      2: # Construct and maintain state and binary representation of course for user
                      3: #
1.135   ! raeburn     4: # $Id: lonuserstate.pm,v 1.134 2009/12/03 19:01:33 www 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 $retfurl; # first URL
1.29      www        57: my %randompick; # randomly picked resources
1.51      www        58: my %randompickseed; # optional seed for randomly picking resources
1.124     albertel   59: my %randomorder; # maps to order contents randomly
1.73      www        60: my %encurl; # URLs in this folder are supposed to be encrypted
                     61: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
1.61      www        62: 
                     63: # ----------------------------------- Remove version from URL and store in hash
                     64: 
1.134     www        65: sub versionerror {
                     66:     my ($uri,$usedversion,$unusedversion)=@_;
                     67:     return '<br />'.&mt('Version discrepancy: resource [_1] included in both version [_2] and version [_3]. Using version [_2].',
                     68:                     $uri,$usedversion,$unusedversion).'<br />';
                     69: }
                     70: 
1.61      www        71: sub versiontrack {
                     72:     my $uri=shift;
                     73:     if ($uri=~/\.(\d+)\.\w+$/) {
                     74: 	my $version=$1;
                     75: 	$uri=~s/\.\d+\.(\w+)$/\.$1/;
1.62      www        76:         unless ($hash{'version_'.$uri}) {
                     77: 	    $hash{'version_'.$uri}=$version;
1.134     www        78: 	} elsif ($version!=$hash{'version_'.$uri}) {
                     79:             $errtext.=&versionerror($uri,$hash{'version_'.$uri},$version);
                     80:         }
1.61      www        81:     }
                     82:     return $uri;
                     83: }
                     84: 
                     85: # -------------------------------------------------------------- Put in version
                     86: 
                     87: sub putinversion {
                     88:     my $uri=shift;
1.93      www        89:     my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
1.61      www        90:     if ($hash{'version_'.$uri}) {
                     91: 	my $version=$hash{'version_'.$uri};
1.65      www        92: 	if ($version eq 'mostrecent') { return $uri; }
1.66      www        93: 	if ($version eq &Apache::lonnet::getversion(
                     94: 			&Apache::lonnet::filelocation('',$uri))) 
                     95: 	             { return $uri; }
1.61      www        96: 	$uri=~s/\.(\w+)$/\.$version\.$1/;
                     97:     }
1.93      www        98:     &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
1.61      www        99:     return $uri;
                    100: }
                    101: 
                    102: # ----------------------------------------- Processing versions file for course
                    103: 
                    104: sub processversionfile {
1.64      www       105:     my %cenv=@_;
1.61      www       106:     my %versions=&Apache::lonnet::dump('resourceversions',
                    107: 				       $cenv{'domain'},
                    108: 				       $cenv{'num'});
1.106     albertel  109:     foreach my $ver (keys(%versions)) {
                    110: 	if ($ver=~/^error\:/) { return; }
                    111: 	$hash{'version_'.$ver}=$versions{$ver};
1.61      www       112:     }
                    113: }
1.45      www       114: 
1.1       www       115: # --------------------------------------------------------- Loads map from disk
                    116: 
                    117: sub loadmap { 
1.124     albertel  118:     my ($uri,$parent_rid)=@_;
1.114     www       119:     if ($hash{'map_pc_'.$uri}) { 
1.120     albertel  120: 	$errtext.='<p class="LC_error">'.
                    121: 	    &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
                    122: 	    '</p>';
1.114     www       123: 	return; 
                    124:     }
1.1       www       125:     $pc++;
                    126:     my $lpc=$pc;
                    127:     $hash{'map_pc_'.$uri}=$lpc;
                    128:     $hash{'map_id_'.$lpc}=$uri;
                    129: 
1.37      www       130: # Determine and check filename
1.62      www       131:     my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
1.37      www       132: 
                    133:     my $ispage=($fn=~/\.page$/);
1.1       www       134: 
1.10      www       135:     unless (($fn=~/\.sequence$/) ||
1.1       www       136:             ($fn=~/\.page$/)) { 
1.114     www       137: 	$errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
1.98      albertel  138: 	return; 
1.1       www       139:     }
                    140: 
1.37      www       141:     my $instr=&Apache::lonnet::getfile($fn);
                    142: 
1.124     albertel  143:     if ($instr eq -1) {
                    144:         $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
                    145: 	return;
                    146:     }
1.22      www       147: 
1.37      www       148: # Successfully got file, parse it
1.1       www       149: 
1.124     albertel  150:     my $parser = HTML::TokeParser->new(\$instr);
                    151:     $parser->attr_encoded(1);
                    152:     # first get all parameters
                    153:     while (my $token = $parser->get_token) {
                    154: 	next if ($token->[0] ne 'S');
                    155: 	if ($token->[1] eq 'param') {
                    156: 	    &parse_param($token,$lpc);
                    157: 	} 
                    158:     }
                    159:     #reset parser
                    160:     $parser = HTML::TokeParser->new(\$instr);
                    161:     $parser->attr_encoded(1);
1.1       www       162: 
1.124     albertel  163:     my $linkpc=0;
1.1       www       164: 
1.124     albertel  165:     $fn=~/\.(\w+)$/;
1.1       www       166: 
1.124     albertel  167:     $hash{'map_type_'.$lpc}=$1;
1.1       www       168: 
1.124     albertel  169:     my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
1.1       www       170: 
1.124     albertel  171:     my @map_ids;
                    172:     while (my $token = $parser->get_token) {
                    173: 	next if ($token->[0] ne 'S');
                    174: 	if ($token->[1] eq 'resource') {
                    175: 	    push(@map_ids,&parse_resource($token,$lpc,$ispage,$uri));
                    176: 	} elsif ($token->[1] eq 'link' && !$randomize) {
1.1       www       177: # ----------------------------------------------------------------------- Links
1.124     albertel  178: 	    &make_link(++$linkpc,$lpc,$token->[2]->{'to'},
                    179: 		       $token->[2]->{'from'},
                    180: 		       $token->[2]->{'condition'});
                    181: 	} elsif ($token->[1] eq 'condition' && !$randomize) {
                    182: 	    &parse_condition($token,$lpc);
                    183: 	}
                    184:     }
1.1       www       185: 
1.124     albertel  186:     if ($randomize) {
                    187: 	if (!$env{'request.role.adv'}) {
                    188: 	    my $seed;
                    189: 	    if (defined($randompickseed{$parent_rid})) {
                    190: 		$seed = $randompickseed{$parent_rid};
                    191: 	    } else {
                    192: 		my ($mapid,$resid)=split(/\./,$parent_rid);
                    193: 		my $symb=
                    194: 		    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    195: 						 $resid,$hash{'src_'.$parent_rid});
1.85      albertel  196: 		
1.124     albertel  197: 		$seed = $symb;
                    198: 	    }
                    199: 	
                    200: 	    my $rndseed=&Apache::lonnet::rndseed($seed);
                    201: 	    &Apache::lonnet::setup_random_from_rndseed($rndseed);
                    202: 	    @map_ids=&Math::Random::random_permutation(@map_ids);
                    203: 	}
                    204: 	my $from = shift(@map_ids);
                    205: 	my $from_rid = $lpc.'.'.$from;
                    206: 	$hash{'map_start_'.$uri} = $from_rid;
                    207: 	$hash{'type_'.$from_rid}='start';
                    208: 
                    209: 	while (my $to = shift(@map_ids)) {
                    210: 	    &make_link(++$linkpc,$lpc,$to,$from);
                    211: 	    my $to_rid =  $lpc.'.'.$to;
                    212: 	    $hash{'type_'.$to_rid}='normal';
                    213: 	    $from = $to;
                    214: 	    $from_rid = $to_rid;
                    215: 	}
1.1       www       216: 
1.124     albertel  217: 	$hash{'map_finish_'.$uri}= $from_rid;
                    218: 	$hash{'type_'.$from_rid}='finish';
1.1       www       219:     }
1.121     albertel  220: 
1.127     albertel  221:     $parser = HTML::TokeParser->new(\$instr);
1.121     albertel  222:     $parser->attr_encoded(1);
                    223:     # last parse out the mapalias params so as to ignore anything
                    224:     # refering to non-existant resources
                    225:     while (my $token = $parser->get_token) {
                    226: 	next if ($token->[0] ne 'S');
                    227: 	if ($token->[1] eq 'param') {
                    228: 	    &parse_mapalias_param($token,$lpc);
                    229: 	} 
                    230:     }
                    231: }
                    232: 
1.124     albertel  233: 
                    234: # -------------------------------------------------------------------- Resource
                    235: sub parse_resource {
                    236:     my ($token,$lpc,$ispage,$uri) = @_;
                    237:     if ($token->[2]->{'type'} eq 'zombie') { next; }
                    238:     my $rid=$lpc.'.'.$token->[2]->{'id'};
                    239: 	    
                    240:     $hash{'kind_'.$rid}='res';
                    241:     $hash{'title_'.$rid}=$token->[2]->{'title'};
                    242:     my $turi=&versiontrack($token->[2]->{'src'});
                    243:     if ($token->[2]->{'version'}) {
                    244: 	unless ($hash{'version_'.$turi}) {
                    245: 	    $hash{'version_'.$turi}=$1;
                    246: 	}
                    247:     }
                    248:     my $title=$token->[2]->{'title'};
                    249:     $title=~s/\&colon\;/\:/gs;
                    250: #   my $symb=&Apache::lonnet::encode_symb($uri,
                    251: #					  $token->[2]->{'id'},
                    252: #					  $turi);
                    253: #   &Apache::lonnet::do_cache_new('title',$symb,$title);
                    254:     unless ($ispage) {
                    255: 	$turi=~/\.(\w+)$/;
                    256: 	my $embstyle=&Apache::loncommon::fileembstyle($1);
                    257: 	if ($token->[2]->{'external'} eq 'true') { # external
1.130     raeburn   258: 	    $turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//;
1.124     albertel  259: 	} elsif ($turi=~/^\/*uploaded\//) { # uploaded
                    260: 	    if (($embstyle eq 'img') 
                    261: 		|| ($embstyle eq 'emb')
                    262: 		|| ($embstyle eq 'wrp')) {
                    263: 		$turi='/adm/wrapper'.$turi;
                    264: 	    } elsif ($embstyle eq 'ssi') {
                    265: 		#do nothing with these
                    266: 	    } elsif ($turi!~/\.(sequence|page)$/) {
                    267: 		$turi='/adm/coursedocs/showdoc'.$turi;
                    268: 	    }
                    269: 	} elsif ($turi=~/\S/) { # normal non-empty internal resource
                    270: 	    my $mapdir=$uri;
                    271: 	    $mapdir=~s/[^\/]+$//;
                    272: 	    $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
                    273: 	    if (($embstyle eq 'img') 
                    274: 		|| ($embstyle eq 'emb')
                    275: 		|| ($embstyle eq 'wrp')) {
                    276: 		$turi='/adm/wrapper'.$turi;
                    277: 	    }
                    278: 	}
                    279:     }
                    280: # Store reverse lookup, remove query string
                    281:     my $idsuri=$turi;
                    282:     $idsuri=~s/\?.+$//;
                    283:     if (defined($hash{'ids_'.$idsuri})) {
                    284: 	$hash{'ids_'.$idsuri}.=','.$rid;
                    285:     } else {
                    286: 	$hash{'ids_'.$idsuri}=''.$rid;
                    287:     }
                    288:     
1.135   ! raeburn   289:     if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard|viewclasslist)$/) {
1.124     albertel  290: 	$turi.='?register=1';
                    291:     }
                    292:     
                    293:     $hash{'src_'.$rid}=$turi;
                    294:     
                    295:     if ($token->[2]->{'external'} eq 'true') {
                    296: 	$hash{'ext_'.$rid}='true:';
                    297:     } else {
                    298: 	$hash{'ext_'.$rid}='false:';
                    299:     }
                    300:     if ($token->[2]->{'type'}) {
                    301: 	$hash{'type_'.$rid}=$token->[2]->{'type'};
                    302: 	if ($token->[2]->{'type'} eq 'start') {
                    303: 	    $hash{'map_start_'.$uri}="$rid";
                    304: 	}
                    305: 	if ($token->[2]->{'type'} eq 'finish') {
                    306: 	    $hash{'map_finish_'.$uri}="$rid";
                    307: 	}
                    308:     }  else {
                    309: 	$hash{'type_'.$rid}='normal';
                    310:     }
                    311:     
                    312:     if (($turi=~/\.sequence$/) ||
                    313: 	($turi=~/\.page$/)) {
                    314: 	$hash{'is_map_'.$rid}=1;
                    315: 	&loadmap($turi,$rid);
                    316:     } 
                    317:     return $token->[2]->{'id'};
                    318: }
                    319: 
                    320: sub make_link {
                    321:     my ($linkpc,$lpc,$to,$from,$condition) = @_;
                    322:     
                    323:     my $linkid=$lpc.'.'.$linkpc;
                    324:     my $goesto=$lpc.'.'.$to;
                    325:     my $comesfrom=$lpc.'.'.$from;
                    326:     my $undercond=0;
                    327: 
                    328:     if ($condition) {
                    329: 	$undercond=$lpc.'.'.$condition;
                    330:     }
                    331: 
                    332:     $hash{'goesto_'.$linkid}=$goesto;
                    333:     $hash{'comesfrom_'.$linkid}=$comesfrom;
                    334:     $hash{'undercond_'.$linkid}=$undercond;
                    335: 
                    336:     if (defined($hash{'to_'.$comesfrom})) {
                    337: 	$hash{'to_'.$comesfrom}.=','.$linkid;
                    338:     } else {
                    339: 	$hash{'to_'.$comesfrom}=''.$linkid;
                    340:     }
                    341:     if (defined($hash{'from_'.$goesto})) {
                    342: 	$hash{'from_'.$goesto}.=','.$linkid;
                    343:     } else {
                    344: 	$hash{'from_'.$goesto}=''.$linkid;
                    345:     }
                    346: }
                    347: 
                    348: # ------------------------------------------------------------------- Condition
                    349: sub parse_condition {
                    350:     my ($token,$lpc) = @_;
                    351:     my $rid=$lpc.'.'.$token->[2]->{'id'};
                    352:     
                    353:     $hash{'kind_'.$rid}='cond';
                    354: 
                    355:     my $condition = $token->[2]->{'value'};
                    356:     $condition =~ s/[\n\r]+/ /gs;
                    357:     push(@cond, $condition);
                    358:     $hash{'condid_'.$rid}=$#cond;
                    359:     if ($token->[2]->{'type'}) {
                    360: 	$cond[$#cond].=':'.$token->[2]->{'type'};
                    361:     }  else {
                    362: 	$cond[$#cond].=':normal';
                    363:     }
                    364: }
                    365: 
                    366: # ------------------------------------------------------------------- Parameter
                    367: 
                    368: sub parse_param {
                    369:     my ($token,$lpc) = @_;
                    370:     my $referid=$lpc.'.'.$token->[2]->{'to'};
                    371:     my $name=$token->[2]->{'name'};
                    372:     my $part;
                    373:     if ($name=~/^parameter_(.*)_/) {
                    374: 	$part=$1;
                    375:     } else {
                    376: 	$part=0;
                    377:     }
                    378:     $name=~s/^.*_([^_]*)$/$1/;
                    379:     my $newparam=
                    380: 	&escape($token->[2]->{'type'}).':'.
                    381: 	&escape($part.'.'.$name).'='.
                    382: 	&escape($token->[2]->{'value'});
                    383:     if (defined($hash{'param_'.$referid})) {
                    384: 	$hash{'param_'.$referid}.='&'.$newparam;
                    385:     } else {
                    386: 	$hash{'param_'.$referid}=''.$newparam;
                    387:     }
                    388:     if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
                    389: 	$randompick{$referid}=$token->[2]->{'value'};
                    390:     }
                    391:     if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
                    392: 	$randompickseed{$referid}=$token->[2]->{'value'};
                    393:     }
                    394:     if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) {
                    395: 	$randomorder{$referid}=$token->[2]->{'value'};
                    396:     }
                    397:     if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
                    398: 	if ($token->[2]->{'value'}=~/^yes$/i) {
                    399: 	    $encurl{$referid}=1;
                    400: 	}
                    401:     }
                    402:     if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
                    403: 	if ($token->[2]->{'value'}=~/^yes$/i) {
                    404: 	    $hiddenurl{$referid}=1;
                    405: 	}
                    406:     }
                    407: }
                    408: 
1.121     albertel  409: sub parse_mapalias_param {
                    410:     my ($token,$lpc) = @_;
                    411:     my $referid=$lpc.'.'.$token->[2]->{'to'};
                    412:     return if (!exists($hash{'src_'.$referid}));
                    413: 
                    414:     if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
1.122     albertel  415: 	&count_mapalias($token->[2]->{'value'},$referid);
1.121     albertel  416: 	$hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
                    417:     }
1.1       www       418: }
                    419: 
1.3       www       420: # --------------------------------------------------------- Simplify expression
                    421: 
                    422: sub simplify {
1.85      albertel  423:     my $expression=shift;
1.101     albertel  424: # (0&1) = 1
1.105     albertel  425:     $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
1.3       www       426: # (8)=8
1.105     albertel  427:     $expression=~s/\(([_\.\d]+)\)/$1/g;
1.3       www       428: # 8&8=8
1.105     albertel  429:     $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
1.3       www       430: # 8|8=8
1.105     albertel  431:     $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
1.3       www       432: # (5&3)&4=5&3&4
1.105     albertel  433:     $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
1.3       www       434: # (((5&3)|(4&6)))=((5&3)|(4&6))
1.105     albertel  435:     $expression=~
                    436: 	s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
1.3       www       437: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
1.85      albertel  438:     $expression=~
1.105     albertel  439: 	s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
1.85      albertel  440:     return $expression;
1.3       www       441: }
                    442: 
1.2       www       443: # -------------------------------------------------------- Build condition hash
                    444: 
                    445: sub traceroute {
1.77      www       446:     my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
1.81      albertel  447:     my $newsofar=$sofar=simplify($sofar);
1.120     albertel  448:     unless ($beenhere=~/\&\Q$rid\E\&/) {
1.85      albertel  449: 	$beenhere.=$rid.'&';  
                    450: 	my ($mapid,$resid)=split(/\./,$rid);
                    451: 	my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
                    452: 	my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
1.91      albertel  453: 
1.90      albertel  454: 	if ($hdnflag || lc($hidden) eq 'yes') {
                    455: 	    $hiddenurl{$rid}=1;
1.91      albertel  456: 	}
                    457: 	if (!$hdnflag && lc($hidden) eq 'no') {
1.90      albertel  458: 	    delete($hiddenurl{$rid});
                    459: 	}
1.91      albertel  460: 
1.85      albertel  461: 	my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
                    462: 	if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
1.116     www       463: 	if (($retfrid eq '') && ($hash{'src_'.$rid})
1.85      albertel  464: 	    && ($hash{'src_'.$rid}!~/\.sequence$/)) {
1.116     www       465: 	    $retfrid=$rid;
1.85      albertel  466: 	}
                    467: 	if (defined($hash{'conditions_'.$rid})) {
                    468: 	    $hash{'conditions_'.$rid}=simplify(
1.103     albertel  469:            '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1.85      albertel  470: 	} else {
                    471: 	    $hash{'conditions_'.$rid}=$sofar;
                    472: 	}
1.107     albertel  473: 
                    474: 	# if the expression is just the 0th condition keep it
                    475: 	# otherwise leave a pointer to this condition expression
                    476: 	$newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
                    477: 
1.85      albertel  478: 	if (defined($hash{'is_map_'.$rid})) {
                    479: 	    if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
                    480: 		$sofar=$newsofar=
                    481: 		    &traceroute($sofar,
1.126     albertel  482: 				$hash{'map_start_'.$hash{'src_'.$rid}},
                    483: 				$beenhere,
1.85      albertel  484: 				$encflag || $encurl{$rid},
                    485: 				$hdnflag || $hiddenurl{$rid});
                    486: 	    }
                    487: 	}
                    488: 	if (defined($hash{'to_'.$rid})) {
1.106     albertel  489: 	    foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.2       www       490: 		my $further=$sofar;
1.106     albertel  491:                 if ($hash{'undercond_'.$id}) {
                    492: 		    if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
1.105     albertel  493: 			$further=simplify('('.'_'.$rid.')&('.
1.106     albertel  494: 					  $hash{'condid_'.$hash{'undercond_'.$id}}.')');
1.85      albertel  495: 		    } else {
1.114     www       496: 			$errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
1.85      albertel  497: 		    }
1.2       www       498:                 }
1.106     albertel  499:                 $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
1.81      albertel  500: 				      $encflag,$hdnflag);
1.85      albertel  501: 	    }
                    502: 	}
1.2       www       503:     }
1.81      albertel  504:     return $newsofar;
1.2       www       505: }
1.1       www       506: 
1.19      www       507: # ------------------------------ Cascading conditions, quick access, parameters
1.4       www       508: 
                    509: sub accinit {
                    510:     my ($uri,$short,$fn)=@_;
                    511:     my %acchash=();
                    512:     my %captured=();
                    513:     my $condcounter=0;
1.5       www       514:     $acchash{'acc.cond.'.$short.'.0'}=0;
1.104     albertel  515:     foreach my $key (keys(%hash)) {
                    516: 	if ($key=~/^conditions/) {
                    517: 	    my $expr=$hash{$key};
1.109     albertel  518: 	    # try to find and factor out common sub-expressions
1.105     albertel  519: 	    foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
1.104     albertel  520: 		my $orig=$sub;
1.109     albertel  521: 
                    522: 		my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
                    523: 		next if (!defined($factor));
                    524: 
                    525: 		$sub=~s/\Q$factor\E//g;
1.85      albertel  526: 		$sub=~s/^\(/\($factor\(/;
                    527: 		$sub.=')';
                    528: 		$sub=simplify($sub);
1.109     albertel  529: 		$expr=~s/\Q$orig\E/$sub/;
1.85      albertel  530: 	    }
1.104     albertel  531: 	    $hash{$key}=$expr;
1.85      albertel  532: 	    unless (defined($captured{$expr})) {
                    533: 		$condcounter++;
                    534: 		$captured{$expr}=$condcounter;
                    535: 		$acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
                    536: 	    } 
1.104     albertel  537: 	} elsif ($key=~/^param_(\d+)\.(\d+)/) {
1.86      albertel  538: 	    my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
                    539: 						    $hash{'src_'.$1.'.'.$2});
1.104     albertel  540: 	    foreach my $param (split(/\&/,$hash{$key})) {
                    541: 		my ($typename,$value)=split(/\=/,$param);
1.85      albertel  542: 		my ($type,$name)=split(/\:/,$typename);
1.114     www       543: 		$parmhash{$prefix.'.'.&unescape($name)}=
                    544: 		    &unescape($value);
                    545: 		$parmhash{$prefix.'.'.&unescape($name).'.type'}=
                    546: 		    &unescape($type);
1.85      albertel  547: 	    }
                    548: 	}
1.26      harris41  549:     }
1.104     albertel  550:     foreach my $key (keys(%hash)) {
                    551: 	if ($key=~/^ids/) {
                    552: 	    foreach my $resid (split(/\,/,$hash{$key})) {
1.85      albertel  553: 		my $uri=$hash{'src_'.$resid};
1.100     albertel  554: 		my ($uripath,$urifile) =
                    555: 		    &Apache::lonnet::split_uri_for_cond($uri);
1.85      albertel  556: 		if ($uripath) {
                    557: 		    my $uricond='0';
                    558: 		    if (defined($hash{'conditions_'.$resid})) {
                    559: 			$uricond=$captured{$hash{'conditions_'.$resid}};
                    560: 		    }
                    561: 		    if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
                    562: 			if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
                    563: 			    /(\&\Q$urifile\E\:[^\&]*)/) {
                    564: 			    my $replace=$1;
                    565: 			    my $regexp=$replace;
                    566: 			    #$regexp=~s/\|/\\\|/g;
1.105     albertel  567: 			    $acchash{'acc.res.'.$short.'.'.$uripath} =~
1.104     albertel  568: 				s/\Q$regexp\E/$replace\|$uricond/;
1.85      albertel  569: 			} else {
                    570: 			    $acchash{'acc.res.'.$short.'.'.$uripath}.=
                    571: 				$urifile.':'.$uricond.'&';
                    572: 			}
                    573: 		    } else {
                    574: 			$acchash{'acc.res.'.$short.'.'.$uripath}=
                    575: 			    '&'.$urifile.':'.$uricond.'&';
                    576: 		    }
                    577: 		} 
                    578: 	    }
                    579: 	}
1.26      harris41  580:     }
1.24      www       581:     $acchash{'acc.res.'.$short.'.'}='&:0&';
1.8       www       582:     my $courseuri=$uri;
                    583:     $courseuri=~s/^\/res\///;
1.131     raeburn   584:     my $regexp = 1;
                    585:     &Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp);
1.128     raeburn   586:     &Apache::lonnet::appenv(\%acchash);
1.4       www       587: }
                    588: 
1.73      www       589: # ---------------- Selectively delete from randompick maps and hidden url parms
1.29      www       590: 
1.73      www       591: sub hiddenurls {
1.31      www       592:     my $randomoutentry='';
1.29      www       593:     foreach my $rid (keys %randompick) {
                    594:         my $rndpick=$randompick{$rid};
                    595:         my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
                    596: # ------------------------------------------- put existing resources into array
                    597:         my @currentrids=();
1.106     albertel  598:         foreach my $key (sort(keys(%hash))) {
                    599: 	    if ($key=~/^src_($mpc\.\d+)/) {
1.29      www       600: 		if ($hash{'src_'.$1}) { push @currentrids, $1; }
                    601:             }
                    602:         }
1.50      albertel  603: 	# rids are number.number and we want to numercially sort on 
                    604:         # the second number
                    605: 	@currentrids=sort {
                    606: 	    my (undef,$aid)=split(/\./,$a);
                    607: 	    my (undef,$bid)=split(/\./,$b);
                    608: 	    $aid <=> $bid;
                    609: 	} @currentrids;
1.29      www       610:         next if ($#currentrids<$rndpick);
                    611: # -------------------------------- randomly eliminate the ones that should stay
1.50      albertel  612: 	my (undef,$id)=split(/\./,$rid);
1.51      www       613:         if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
1.50      albertel  614: 	my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
1.58      albertel  615: 	&Apache::lonnet::setup_random_from_rndseed($rndseed);
1.50      albertel  616: 	my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
                    617:         for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
                    618: 	#&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
1.29      www       619: # -------------------------------------------------------- delete the leftovers
                    620:         for (my $k=0; $k<=$#currentrids; $k++) {
                    621:             if ($currentrids[$k]) {
                    622: 		$hash{'randomout_'.$currentrids[$k]}=1;
1.32      www       623:                 my ($mapid,$resid)=split(/\./,$currentrids[$k]);
                    624:                 $randomoutentry.='&'.
1.86      albertel  625: 		    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    626: 						 $resid,
                    627: 						 $hash{'src_'.$currentrids[$k]}
                    628: 						 ).'&';
1.29      www       629:             }
                    630:         }
1.31      www       631:     }
1.73      www       632: # ------------------------------ take care of explicitly hidden urls or folders
                    633:     foreach my $rid (keys %hiddenurl) {
                    634: 	$hash{'randomout_'.$rid}=1;
                    635: 	my ($mapid,$resid)=split(/\./,$rid);
                    636: 	$randomoutentry.='&'.
1.86      albertel  637: 	    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
                    638: 					 $hash{'src_'.$rid}).'&';
1.73      www       639:     }
                    640: # --------------------------------------- append randomout entry to environment
1.31      www       641:     if ($randomoutentry) {
1.128     raeburn   642: 	&Apache::lonnet::appenv({'acc.randomout' => $randomoutentry});
1.29      www       643:     }
                    644: }
                    645: 
1.1       www       646: # ---------------------------------------------------- Read map and all submaps
                    647: 
                    648: sub readmap {
1.85      albertel  649:     my $short=shift;
                    650:     $short=~s/^\///;
1.108     albertel  651:     my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
1.85      albertel  652:     my $fn=$cenv{'fn'};
                    653:     my $uri;
                    654:     $short=~s/\//\_/g;
                    655:     unless ($uri=$cenv{'url'}) { 
1.133     raeburn   656: 	&Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.85      albertel  657: 				 "Could not load course $short.</font>"); 
1.114     www       658: 	return ('',&mt('No course data available.'));;
1.85      albertel  659:     }
                    660:     @cond=('true:normal');
1.96      albertel  661: 
1.133     raeburn   662:     unless (open(LOCKFILE,">$fn.db.lock")) {
                    663:         $errtext.='<br />'.&mt('Map not loaded - Lock file could not be opened when reading map:').' <tt>'.$fn.'</tt>.';
                    664:         $retfurl = '';
                    665:         return ($retfurl,$errtext);
                    666:     }
1.96      albertel  667:     my $lock=0;
1.132     raeburn   668:     my $gotstate=0;
1.96      albertel  669:     if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
                    670: 	$lock=1;
1.132     raeburn   671:         &unlink_tmpfiles($fn);
1.96      albertel  672:     }
1.85      albertel  673:     undef %randompick;
                    674:     undef %hiddenurl;
                    675:     undef %encurl;
1.116     www       676:     $retfrid='';
1.132     raeburn   677:     my ($untiedhash,$untiedparmhash,$tiedhash,$tiedparmhash);
                    678:     if ($lock) {
                    679:         if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
                    680:             $tiedhash = 1;
                    681:             if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
                    682:                 $tiedparmhash = 1;
                    683:                 $gotstate = &build_tmp_hashes($uri,$fn,$short,\%cenv);
                    684:                 unless ($gotstate) {
                    685:                     &Apache::lonnet::logthis('Failed to write statemap at first attempt '.$fn.' for '.$uri.'.</font>');
                    686:                 }
                    687:                 $untiedparmhash = untie(%parmhash);
                    688:                 unless ($untiedparmhash) {
                    689:                     &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    690:                         'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
                    691:                 }
                    692:             }
                    693:             $untiedhash = untie(%hash);
                    694:             unless ($untiedhash) {
                    695:                 &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    696:                     'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
                    697:             }
                    698:         }
1.96      albertel  699: 	flock(LOCKFILE,LOCK_UN);
1.132     raeburn   700:     }
                    701:     unless ($lock && $tiedhash && $tiedparmhash) { 
1.87      albertel  702: 	# if we are here it is likely because we are already trying to 
                    703: 	# initialize the course in another child, busy wait trying to 
                    704: 	# tie the hashes for the next 90 seconds, if we succeed forward 
                    705: 	# them on to navmaps, if we fail, throw up the Could not init 
                    706: 	# course screen
1.96      albertel  707: 	if ($lock) {
                    708: 	    # Got the lock but not the DB files
                    709: 	    flock(LOCKFILE,LOCK_UN);
1.132     raeburn   710:             $lock = 0;
1.96      albertel  711: 	}
1.132     raeburn   712:         if ($tiedhash) {
                    713:             unless($untiedhash) {
                    714: 	        untie(%hash);
                    715:             }
                    716:         }
                    717:         if ($tiedparmhash) {
                    718:             unless($untiedparmhash) {
                    719:                 untie(%parmhash);
                    720:             }
                    721:         }
1.133     raeburn   722: 	&Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.132     raeburn   723: 				 "Could not tie coursemap $fn for $uri.</font>");
                    724:         $tiedhash = '';
                    725:         $tiedparmhash = '';
1.87      albertel  726: 	my $i=0;
                    727: 	while($i<90) {
                    728: 	    $i++;
                    729: 	    sleep(1);
1.132     raeburn   730: 	    if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
                    731:                 $lock = 1;
                    732: 		if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
                    733:                     $tiedhash = 1;
                    734: 		    if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
                    735:                         $tiedparmhash = 1;
                    736:                         if (-e "$fn.state") {
                    737: 		            $retfurl='/adm/navmaps';
                    738: 		            &Apache::lonnet::appenv({"request.course.id"  => $short,
                    739: 		   			             "request.course.fn"  => $fn,
                    740: 					             "request.course.uri" => $uri});
                    741: 		            $untiedhash = untie(%hash);
                    742: 		            $untiedparmhash = untie(%parmhash);
                    743:                             $gotstate = 1;
                    744: 		            last;
                    745: 		        }
                    746:                         $untiedparmhash = untie(%parmhash);
                    747: 	            }
                    748: 	            $untiedhash = untie(%hash);
                    749:                 }
                    750:             }
1.87      albertel  751: 	}
1.132     raeburn   752:         if ($lock) {
                    753:             flock(LOCKFILE,LOCK_UN);
1.133     raeburn   754:             $lock = 0;
1.132     raeburn   755:             if ($tiedparmhash) {
                    756:                 unless ($untiedparmhash) {
                    757:                     &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    758:                         'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
                    759:                 }
                    760:             }
                    761:             if ($tiedparmhash) {
                    762:                 unless ($untiedhash) {
                    763:                     &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    764:                         'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
                    765:                 }
                    766:             }
                    767:         }
                    768:     }
                    769:     unless ($gotstate) {
1.133     raeburn   770:         $lock = 0;
1.132     raeburn   771:         &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    772:                      'Could not read statemap '.$fn.' for '.$uri.'.</font>');
                    773:         &unlink_tmpfiles($fn);
1.133     raeburn   774:         if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
                    775:             $lock=1;
                    776:         }
                    777:         undef %randompick;
                    778:         undef %hiddenurl;
                    779:         undef %encurl;
                    780:         $retfrid='';
                    781:         if ($lock) {
                    782:             if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
                    783:                 if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
                    784:                     $gotstate = &build_tmp_hashes($uri,$fn,$short,\%cenv);
                    785:                     unless ($gotstate) {
1.132     raeburn   786:                         &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.133     raeburn   787:                             'Failed to write statemap at second attempt '.$fn.' for '.$uri.'.</font>');
1.132     raeburn   788:                     }
1.133     raeburn   789:                     unless (untie(%parmhash)) {
1.132     raeburn   790:                         &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.133     raeburn   791:                             'Could not untie coursemap parmhash '.$fn.'.db for '.$uri.'.</font>');
1.132     raeburn   792:                     }
1.133     raeburn   793:                 } else {
                    794:                     &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    795:                         'Could not tie coursemap '.$fn.'__parms.db for '.$uri.'.</font>');
                    796:                 }
                    797:                 unless (untie(%hash)) {
                    798:                     &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    799:                         'Could not untie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
                    800:                 }
1.132     raeburn   801:             } else {
1.133     raeburn   802:                &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    803:                    'Could not tie coursemap '.$fn.'.db for '.$uri.'.</font>');
1.132     raeburn   804:             }
1.133     raeburn   805:             flock(LOCKFILE,LOCK_UN);
                    806:             $lock = 0;
                    807:         } else {
                    808:             &Apache::lonnet::logthis('<font color="blue">WARNING: '.
                    809:             'Could not obtain lock to tie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
1.132     raeburn   810:         }
                    811:     }
1.133     raeburn   812:     close(LOCKFILE);
1.132     raeburn   813:     unless (($errtext eq '') || ($env{'request.course.uri'} =~ m{^/uploaded/})) {
                    814:         &Apache::lonmsg::author_res_msg($env{'request.course.uri'},
                    815:                                         $errtext);
1.1       www       816:     }
1.46      www       817: # ------------------------------------------------- Check for critical messages
                    818: 
1.89      albertel  819:     my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
                    820: 				   $env{'user.name'});
1.46      www       821:     if ($what[0]) {
                    822: 	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
                    823: 	    $retfurl='/adm/email?critical=display';
                    824:         }
                    825:     }
1.85      albertel  826:     return ($retfurl,$errtext);
1.1       www       827: }
1.15      www       828: 
1.132     raeburn   829: sub build_tmp_hashes {
                    830:     my ($uri,$fn,$short,$cenvref) = @_;
                    831:     unless(ref($cenvref) eq 'HASH') {
                    832:         return;
                    833:     }
                    834:     my %cenv = %{$cenvref};
                    835:     my $gotstate = 0;
                    836:     %hash=();
                    837:     %parmhash=();
                    838:     $errtext='';
                    839:     $pc=0;
                    840:     &clear_mapalias_count();
                    841:     &processversionfile(%cenv);
                    842:     my $furi=&Apache::lonnet::clutter($uri);
                    843:     $hash{'src_0.0'}=&versiontrack($furi);
                    844:     $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
                    845:     $hash{'ids_'.$furi}='0.0';
                    846:     $hash{'is_map_0.0'}=1;
                    847:     &loadmap($uri,'0.0');
                    848:     if (defined($hash{'map_start_'.$uri})) {
                    849:         &Apache::lonnet::appenv({"request.course.id"  => $short,
                    850:                                  "request.course.fn"  => $fn,
                    851:                                  "request.course.uri" => $uri});
                    852:         $env{'request.course.id'}=$short;
                    853:         &traceroute('0',$hash{'map_start_'.$uri},'&');
                    854:         &accinit($uri,$short,$fn);
                    855:         &hiddenurls();
                    856:     }
                    857:     $errtext .= &get_mapalias_errors();
                    858: # ------------------------------------------------------- Put versions into src
                    859:     foreach my $key (keys(%hash)) {
                    860:         if ($key=~/^src_/) {
                    861:             $hash{$key}=&putinversion($hash{$key});
                    862:         } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
                    863:             my ($type, $url) = ($1,$2);
                    864:             my $value = $hash{$key};
                    865:             $hash{$type.&putinversion($url)}=$value;
                    866:         }
                    867:     }
                    868: # ---------------------------------------------------------------- Encrypt URLs
                    869:     foreach my $id (keys(%encurl)) {
                    870: #           $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
                    871:         $hash{'encrypted_'.$id}=1;
                    872:     }
                    873: # ----------------------------------------------- Close hashes to finally store
                    874: # --------------------------------- Routine must pass this point, no early outs
                    875:     $hash{'first_rid'}=$retfrid;
                    876:     my ($mapid,$resid)=split(/\./,$retfrid);
                    877:     $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
                    878:     my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
                    879:     $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
                    880:     if ($hash{'encrypted_'.$retfrid}) {
                    881:         $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
                    882:     }
                    883:     $hash{'first_url'}=$retfurl;
                    884: # ---------------------------------------------------- Store away initial state
                    885:     {
                    886:         my $cfh;
                    887:         if (open($cfh,">$fn.state")) {
                    888:             print $cfh join("\n",@cond);
                    889:             $gotstate = 1;
                    890:         } else {
                    891:             &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    892:                                      "Could not write statemap $fn for $uri.</font>");
                    893:         }
                    894:     }
                    895:     return $gotstate;
                    896: }
                    897: 
                    898: sub unlink_tmpfiles {
                    899:     my ($fn) = @_;
                    900:     if ($fn =~ m{^\Q$Apache::lonnet::perlvar{'lonUsersDir'}\E/tmp/}) {
                    901:         my @files = qw (.db _symb.db .state _parms.db);
                    902:         foreach my $file (@files) {
                    903:             if (-e $fn.$file) {
                    904:                 unless (unlink($fn.$file)) {
                    905:                     &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    906:                                  "Could not unlink ".$fn.$file."</font>");
                    907:                 }
                    908:             }
                    909:         }
                    910:     }
                    911:     return;
                    912: }
                    913: 
1.15      www       914: # ------------------------------------------------------- Evaluate state string
                    915: 
                    916: sub evalstate {
1.89      albertel  917:     my $fn=$env{'request.course.fn'}.'.state';
1.80      albertel  918:     my $state='';
1.15      www       919:     if (-e $fn) {
1.80      albertel  920: 	my @conditions=();
                    921: 	{
1.115     raeburn   922: 	    open(my $fh,"<$fn");
1.80      albertel  923: 	    @conditions=<$fh>;
1.115     raeburn   924:             close($fh);
1.80      albertel  925: 	}  
                    926: 	my $safeeval = new Safe;
                    927: 	my $safehole = new Safe::Hole;
                    928: 	$safeeval->permit("entereval");
                    929: 	$safeeval->permit(":base_math");
                    930: 	$safeeval->deny(":base_io");
                    931: 	$safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
                    932: 	foreach my $line (@conditions) {
                    933: 	    chomp($line);
                    934: 	    my ($condition,$weight)=split(/\:/,$line);
                    935: 	    if ($safeeval->reval($condition)) {
                    936: 		if ($weight eq 'force') {
                    937: 		    $state.='3';
                    938: 		} else {
                    939: 		    $state.='2';
                    940: 		}
                    941: 	    } else {
                    942: 		if ($weight eq 'stop') {
                    943: 		    $state.='0';
                    944: 		} else {
                    945: 		    $state.='1';
                    946: 		}
                    947: 	    }
                    948: 	}
1.15      www       949:     }
1.128     raeburn   950:     &Apache::lonnet::appenv({'user.state.'.$env{'request.course.id'} => $state});
1.15      www       951:     return $state;
                    952: }
                    953: 
1.122     albertel  954: {
                    955:     my %mapalias_cache;
                    956:     sub count_mapalias {
                    957: 	my ($value,$resid) = @_;
                    958:  	push(@{ $mapalias_cache{$value} }, $resid);
                    959:     }
                    960: 
                    961:     sub get_mapalias_errors {
                    962: 	my $error_text;
                    963: 	foreach my $mapalias (sort(keys(%mapalias_cache))) {
                    964: 	    next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
                    965: 	    my $count;
                    966: 	    my $which =
                    967: 		join('</li><li>', 
                    968: 		     map {
                    969: 			 my $id = $_;
                    970: 			 if (exists($hash{'src_'.$id})) {
                    971: 			     $count++;
                    972: 			 }
                    973: 			 my ($mapid) = split(/\./,$id);
1.125     albertel  974:                          &mt('Resource "[_1]" <br /> in Map "[_2]"',
                    975: 			     $hash{'title_'.$id},
1.122     albertel  976: 			     $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
                    977: 		     } (@{ $mapalias_cache{$mapalias} }));
                    978: 	    next if ($count < 2);
                    979: 	    $error_text .= '<div class="LC_error">'.
                    980: 		&mt('Error: Found the mapalias "[_1]" defined multiple times.',
                    981: 		    $mapalias).
                    982: 		'</div><ul><li>'.$which.'</li></ul>';
                    983: 	}
                    984: 	&clear_mapalias_count();
                    985: 	return $error_text;
                    986:     }
                    987:     sub clear_mapalias_count {
                    988: 	undef(%mapalias_cache);
                    989:     }
                    990: }
1.1       www       991: 1;
                    992: __END__
                    993: 
1.26      harris41  994: =head1 NAME
                    995: 
                    996: Apache::lonuserstate - Construct and maintain state and binary representation
                    997: of course for user
                    998: 
                    999: =head1 SYNOPSIS
                   1000: 
                   1001: Invoked by lonroles.pm.
                   1002: 
                   1003: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
                   1004: 
                   1005: =head1 INTRODUCTION
                   1006: 
                   1007: This module constructs and maintains state and binary representation
                   1008: of course for user.
                   1009: 
                   1010: This is part of the LearningOnline Network with CAPA project
                   1011: described at http://www.lon-capa.org.
                   1012: 
1.129     jms      1013: =head1 SUBROUTINES
1.26      harris41 1014: 
1.129     jms      1015: =over
1.26      harris41 1016: 
1.129     jms      1017: =item loadmap()
1.26      harris41 1018: 
1.129     jms      1019: Loads map from disk
1.26      harris41 1020: 
1.129     jms      1021: =item simplify()
1.26      harris41 1022: 
1.129     jms      1023: Simplify expression
1.26      harris41 1024: 
1.129     jms      1025: =item traceroute()
1.26      harris41 1026: 
1.129     jms      1027: Build condition hash
1.26      harris41 1028: 
1.129     jms      1029: =item accinit()
1.26      harris41 1030: 
1.129     jms      1031: Cascading conditions, quick access, parameters
1.26      harris41 1032: 
1.129     jms      1033: =item readmap()
1.26      harris41 1034: 
1.129     jms      1035: Read map and all submaps
1.1       www      1036: 
1.129     jms      1037: =item evalstate()
1.1       www      1038: 
1.129     jms      1039: Evaluate state string
1.1       www      1040: 
1.26      harris41 1041: =back
1.1       www      1042: 
1.26      harris41 1043: =cut

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