Annotation of rat/lonuserstate.pm, revision 1.131

1.1       www         1: # The LearningOnline Network with CAPA
                      2: # Construct and maintain state and binary representation of course for user
                      3: #
1.131   ! raeburn     4: # $Id: lonuserstate.pm,v 1.130 2008/12/19 03:58:24 raeburn 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: 
                     65: sub versiontrack {
                     66:     my $uri=shift;
                     67:     if ($uri=~/\.(\d+)\.\w+$/) {
                     68: 	my $version=$1;
                     69: 	$uri=~s/\.\d+\.(\w+)$/\.$1/;
1.62      www        70:         unless ($hash{'version_'.$uri}) {
                     71: 	    $hash{'version_'.$uri}=$version;
                     72: 	}
1.61      www        73:     }
                     74:     return $uri;
                     75: }
                     76: 
                     77: # -------------------------------------------------------------- Put in version
                     78: 
                     79: sub putinversion {
                     80:     my $uri=shift;
1.93      www        81:     my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
1.61      www        82:     if ($hash{'version_'.$uri}) {
                     83: 	my $version=$hash{'version_'.$uri};
1.65      www        84: 	if ($version eq 'mostrecent') { return $uri; }
1.66      www        85: 	if ($version eq &Apache::lonnet::getversion(
                     86: 			&Apache::lonnet::filelocation('',$uri))) 
                     87: 	             { return $uri; }
1.61      www        88: 	$uri=~s/\.(\w+)$/\.$version\.$1/;
                     89:     }
1.93      www        90:     &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
1.61      www        91:     return $uri;
                     92: }
                     93: 
                     94: # ----------------------------------------- Processing versions file for course
                     95: 
                     96: sub processversionfile {
1.64      www        97:     my %cenv=@_;
1.61      www        98:     my %versions=&Apache::lonnet::dump('resourceversions',
                     99: 				       $cenv{'domain'},
                    100: 				       $cenv{'num'});
1.106     albertel  101:     foreach my $ver (keys(%versions)) {
                    102: 	if ($ver=~/^error\:/) { return; }
                    103: 	$hash{'version_'.$ver}=$versions{$ver};
1.61      www       104:     }
                    105: }
1.45      www       106: 
1.1       www       107: # --------------------------------------------------------- Loads map from disk
                    108: 
                    109: sub loadmap { 
1.124     albertel  110:     my ($uri,$parent_rid)=@_;
1.114     www       111:     if ($hash{'map_pc_'.$uri}) { 
1.120     albertel  112: 	$errtext.='<p class="LC_error">'.
                    113: 	    &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
                    114: 	    '</p>';
1.114     www       115: 	return; 
                    116:     }
1.1       www       117:     $pc++;
                    118:     my $lpc=$pc;
                    119:     $hash{'map_pc_'.$uri}=$lpc;
                    120:     $hash{'map_id_'.$lpc}=$uri;
                    121: 
1.37      www       122: # Determine and check filename
1.62      www       123:     my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
1.37      www       124: 
                    125:     my $ispage=($fn=~/\.page$/);
1.1       www       126: 
1.10      www       127:     unless (($fn=~/\.sequence$/) ||
1.1       www       128:             ($fn=~/\.page$/)) { 
1.114     www       129: 	$errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
1.98      albertel  130: 	return; 
1.1       www       131:     }
                    132: 
1.37      www       133:     my $instr=&Apache::lonnet::getfile($fn);
                    134: 
1.124     albertel  135:     if ($instr eq -1) {
                    136:         $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
                    137: 	return;
                    138:     }
1.22      www       139: 
1.37      www       140: # Successfully got file, parse it
1.1       www       141: 
1.124     albertel  142:     my $parser = HTML::TokeParser->new(\$instr);
                    143:     $parser->attr_encoded(1);
                    144:     # first get all parameters
                    145:     while (my $token = $parser->get_token) {
                    146: 	next if ($token->[0] ne 'S');
                    147: 	if ($token->[1] eq 'param') {
                    148: 	    &parse_param($token,$lpc);
                    149: 	} 
                    150:     }
                    151:     #reset parser
                    152:     $parser = HTML::TokeParser->new(\$instr);
                    153:     $parser->attr_encoded(1);
1.1       www       154: 
1.124     albertel  155:     my $linkpc=0;
1.1       www       156: 
1.124     albertel  157:     $fn=~/\.(\w+)$/;
1.1       www       158: 
1.124     albertel  159:     $hash{'map_type_'.$lpc}=$1;
1.1       www       160: 
1.124     albertel  161:     my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
1.1       www       162: 
1.124     albertel  163:     my @map_ids;
                    164:     while (my $token = $parser->get_token) {
                    165: 	next if ($token->[0] ne 'S');
                    166: 	if ($token->[1] eq 'resource') {
                    167: 	    push(@map_ids,&parse_resource($token,$lpc,$ispage,$uri));
                    168: 	} elsif ($token->[1] eq 'link' && !$randomize) {
1.1       www       169: # ----------------------------------------------------------------------- Links
1.124     albertel  170: 	    &make_link(++$linkpc,$lpc,$token->[2]->{'to'},
                    171: 		       $token->[2]->{'from'},
                    172: 		       $token->[2]->{'condition'});
                    173: 	} elsif ($token->[1] eq 'condition' && !$randomize) {
                    174: 	    &parse_condition($token,$lpc);
                    175: 	}
                    176:     }
1.1       www       177: 
1.124     albertel  178:     if ($randomize) {
                    179: 	if (!$env{'request.role.adv'}) {
                    180: 	    my $seed;
                    181: 	    if (defined($randompickseed{$parent_rid})) {
                    182: 		$seed = $randompickseed{$parent_rid};
                    183: 	    } else {
                    184: 		my ($mapid,$resid)=split(/\./,$parent_rid);
                    185: 		my $symb=
                    186: 		    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    187: 						 $resid,$hash{'src_'.$parent_rid});
1.85      albertel  188: 		
1.124     albertel  189: 		$seed = $symb;
                    190: 	    }
                    191: 	
                    192: 	    my $rndseed=&Apache::lonnet::rndseed($seed);
                    193: 	    &Apache::lonnet::setup_random_from_rndseed($rndseed);
                    194: 	    @map_ids=&Math::Random::random_permutation(@map_ids);
                    195: 	}
                    196: 	my $from = shift(@map_ids);
                    197: 	my $from_rid = $lpc.'.'.$from;
                    198: 	$hash{'map_start_'.$uri} = $from_rid;
                    199: 	$hash{'type_'.$from_rid}='start';
                    200: 
                    201: 	while (my $to = shift(@map_ids)) {
                    202: 	    &make_link(++$linkpc,$lpc,$to,$from);
                    203: 	    my $to_rid =  $lpc.'.'.$to;
                    204: 	    $hash{'type_'.$to_rid}='normal';
                    205: 	    $from = $to;
                    206: 	    $from_rid = $to_rid;
                    207: 	}
1.1       www       208: 
1.124     albertel  209: 	$hash{'map_finish_'.$uri}= $from_rid;
                    210: 	$hash{'type_'.$from_rid}='finish';
1.1       www       211:     }
1.121     albertel  212: 
1.127     albertel  213:     $parser = HTML::TokeParser->new(\$instr);
1.121     albertel  214:     $parser->attr_encoded(1);
                    215:     # last parse out the mapalias params so as to ignore anything
                    216:     # refering to non-existant resources
                    217:     while (my $token = $parser->get_token) {
                    218: 	next if ($token->[0] ne 'S');
                    219: 	if ($token->[1] eq 'param') {
                    220: 	    &parse_mapalias_param($token,$lpc);
                    221: 	} 
                    222:     }
                    223: }
                    224: 
1.124     albertel  225: 
                    226: # -------------------------------------------------------------------- Resource
                    227: sub parse_resource {
                    228:     my ($token,$lpc,$ispage,$uri) = @_;
                    229:     if ($token->[2]->{'type'} eq 'zombie') { next; }
                    230:     my $rid=$lpc.'.'.$token->[2]->{'id'};
                    231: 	    
                    232:     $hash{'kind_'.$rid}='res';
                    233:     $hash{'title_'.$rid}=$token->[2]->{'title'};
                    234:     my $turi=&versiontrack($token->[2]->{'src'});
                    235:     if ($token->[2]->{'version'}) {
                    236: 	unless ($hash{'version_'.$turi}) {
                    237: 	    $hash{'version_'.$turi}=$1;
                    238: 	}
                    239:     }
                    240:     my $title=$token->[2]->{'title'};
                    241:     $title=~s/\&colon\;/\:/gs;
                    242: #   my $symb=&Apache::lonnet::encode_symb($uri,
                    243: #					  $token->[2]->{'id'},
                    244: #					  $turi);
                    245: #   &Apache::lonnet::do_cache_new('title',$symb,$title);
                    246:     unless ($ispage) {
                    247: 	$turi=~/\.(\w+)$/;
                    248: 	my $embstyle=&Apache::loncommon::fileembstyle($1);
                    249: 	if ($token->[2]->{'external'} eq 'true') { # external
1.130     raeburn   250: 	    $turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//;
1.124     albertel  251: 	} elsif ($turi=~/^\/*uploaded\//) { # uploaded
                    252: 	    if (($embstyle eq 'img') 
                    253: 		|| ($embstyle eq 'emb')
                    254: 		|| ($embstyle eq 'wrp')) {
                    255: 		$turi='/adm/wrapper'.$turi;
                    256: 	    } elsif ($embstyle eq 'ssi') {
                    257: 		#do nothing with these
                    258: 	    } elsif ($turi!~/\.(sequence|page)$/) {
                    259: 		$turi='/adm/coursedocs/showdoc'.$turi;
                    260: 	    }
                    261: 	} elsif ($turi=~/\S/) { # normal non-empty internal resource
                    262: 	    my $mapdir=$uri;
                    263: 	    $mapdir=~s/[^\/]+$//;
                    264: 	    $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
                    265: 	    if (($embstyle eq 'img') 
                    266: 		|| ($embstyle eq 'emb')
                    267: 		|| ($embstyle eq 'wrp')) {
                    268: 		$turi='/adm/wrapper'.$turi;
                    269: 	    }
                    270: 	}
                    271:     }
                    272: # Store reverse lookup, remove query string
                    273:     my $idsuri=$turi;
                    274:     $idsuri=~s/\?.+$//;
                    275:     if (defined($hash{'ids_'.$idsuri})) {
                    276: 	$hash{'ids_'.$idsuri}.=','.$rid;
                    277:     } else {
                    278: 	$hash{'ids_'.$idsuri}=''.$rid;
                    279:     }
                    280:     
                    281:     if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
                    282: 	$turi.='?register=1';
                    283:     }
                    284:     
                    285:     $hash{'src_'.$rid}=$turi;
                    286:     
                    287:     if ($token->[2]->{'external'} eq 'true') {
                    288: 	$hash{'ext_'.$rid}='true:';
                    289:     } else {
                    290: 	$hash{'ext_'.$rid}='false:';
                    291:     }
                    292:     if ($token->[2]->{'type'}) {
                    293: 	$hash{'type_'.$rid}=$token->[2]->{'type'};
                    294: 	if ($token->[2]->{'type'} eq 'start') {
                    295: 	    $hash{'map_start_'.$uri}="$rid";
                    296: 	}
                    297: 	if ($token->[2]->{'type'} eq 'finish') {
                    298: 	    $hash{'map_finish_'.$uri}="$rid";
                    299: 	}
                    300:     }  else {
                    301: 	$hash{'type_'.$rid}='normal';
                    302:     }
                    303:     
                    304:     if (($turi=~/\.sequence$/) ||
                    305: 	($turi=~/\.page$/)) {
                    306: 	$hash{'is_map_'.$rid}=1;
                    307: 	&loadmap($turi,$rid);
                    308:     } 
                    309:     return $token->[2]->{'id'};
                    310: }
                    311: 
                    312: sub make_link {
                    313:     my ($linkpc,$lpc,$to,$from,$condition) = @_;
                    314:     
                    315:     my $linkid=$lpc.'.'.$linkpc;
                    316:     my $goesto=$lpc.'.'.$to;
                    317:     my $comesfrom=$lpc.'.'.$from;
                    318:     my $undercond=0;
                    319: 
                    320:     if ($condition) {
                    321: 	$undercond=$lpc.'.'.$condition;
                    322:     }
                    323: 
                    324:     $hash{'goesto_'.$linkid}=$goesto;
                    325:     $hash{'comesfrom_'.$linkid}=$comesfrom;
                    326:     $hash{'undercond_'.$linkid}=$undercond;
                    327: 
                    328:     if (defined($hash{'to_'.$comesfrom})) {
                    329: 	$hash{'to_'.$comesfrom}.=','.$linkid;
                    330:     } else {
                    331: 	$hash{'to_'.$comesfrom}=''.$linkid;
                    332:     }
                    333:     if (defined($hash{'from_'.$goesto})) {
                    334: 	$hash{'from_'.$goesto}.=','.$linkid;
                    335:     } else {
                    336: 	$hash{'from_'.$goesto}=''.$linkid;
                    337:     }
                    338: }
                    339: 
                    340: # ------------------------------------------------------------------- Condition
                    341: sub parse_condition {
                    342:     my ($token,$lpc) = @_;
                    343:     my $rid=$lpc.'.'.$token->[2]->{'id'};
                    344:     
                    345:     $hash{'kind_'.$rid}='cond';
                    346: 
                    347:     my $condition = $token->[2]->{'value'};
                    348:     $condition =~ s/[\n\r]+/ /gs;
                    349:     push(@cond, $condition);
                    350:     $hash{'condid_'.$rid}=$#cond;
                    351:     if ($token->[2]->{'type'}) {
                    352: 	$cond[$#cond].=':'.$token->[2]->{'type'};
                    353:     }  else {
                    354: 	$cond[$#cond].=':normal';
                    355:     }
                    356: }
                    357: 
                    358: # ------------------------------------------------------------------- Parameter
                    359: 
                    360: sub parse_param {
                    361:     my ($token,$lpc) = @_;
                    362:     my $referid=$lpc.'.'.$token->[2]->{'to'};
                    363:     my $name=$token->[2]->{'name'};
                    364:     my $part;
                    365:     if ($name=~/^parameter_(.*)_/) {
                    366: 	$part=$1;
                    367:     } else {
                    368: 	$part=0;
                    369:     }
                    370:     $name=~s/^.*_([^_]*)$/$1/;
                    371:     my $newparam=
                    372: 	&escape($token->[2]->{'type'}).':'.
                    373: 	&escape($part.'.'.$name).'='.
                    374: 	&escape($token->[2]->{'value'});
                    375:     if (defined($hash{'param_'.$referid})) {
                    376: 	$hash{'param_'.$referid}.='&'.$newparam;
                    377:     } else {
                    378: 	$hash{'param_'.$referid}=''.$newparam;
                    379:     }
                    380:     if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
                    381: 	$randompick{$referid}=$token->[2]->{'value'};
                    382:     }
                    383:     if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
                    384: 	$randompickseed{$referid}=$token->[2]->{'value'};
                    385:     }
                    386:     if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) {
                    387: 	$randomorder{$referid}=$token->[2]->{'value'};
                    388:     }
                    389:     if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
                    390: 	if ($token->[2]->{'value'}=~/^yes$/i) {
                    391: 	    $encurl{$referid}=1;
                    392: 	}
                    393:     }
                    394:     if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
                    395: 	if ($token->[2]->{'value'}=~/^yes$/i) {
                    396: 	    $hiddenurl{$referid}=1;
                    397: 	}
                    398:     }
                    399: }
                    400: 
1.121     albertel  401: sub parse_mapalias_param {
                    402:     my ($token,$lpc) = @_;
                    403:     my $referid=$lpc.'.'.$token->[2]->{'to'};
                    404:     return if (!exists($hash{'src_'.$referid}));
                    405: 
                    406:     if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
1.122     albertel  407: 	&count_mapalias($token->[2]->{'value'},$referid);
1.121     albertel  408: 	$hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
                    409:     }
1.1       www       410: }
                    411: 
1.3       www       412: # --------------------------------------------------------- Simplify expression
                    413: 
                    414: sub simplify {
1.85      albertel  415:     my $expression=shift;
1.101     albertel  416: # (0&1) = 1
1.105     albertel  417:     $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
1.3       www       418: # (8)=8
1.105     albertel  419:     $expression=~s/\(([_\.\d]+)\)/$1/g;
1.3       www       420: # 8&8=8
1.105     albertel  421:     $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
1.3       www       422: # 8|8=8
1.105     albertel  423:     $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
1.3       www       424: # (5&3)&4=5&3&4
1.105     albertel  425:     $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
1.3       www       426: # (((5&3)|(4&6)))=((5&3)|(4&6))
1.105     albertel  427:     $expression=~
                    428: 	s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
1.3       www       429: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
1.85      albertel  430:     $expression=~
1.105     albertel  431: 	s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
1.85      albertel  432:     return $expression;
1.3       www       433: }
                    434: 
1.2       www       435: # -------------------------------------------------------- Build condition hash
                    436: 
                    437: sub traceroute {
1.77      www       438:     my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
1.81      albertel  439:     my $newsofar=$sofar=simplify($sofar);
1.120     albertel  440:     unless ($beenhere=~/\&\Q$rid\E\&/) {
1.85      albertel  441: 	$beenhere.=$rid.'&';  
                    442: 	my ($mapid,$resid)=split(/\./,$rid);
                    443: 	my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
                    444: 	my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
1.91      albertel  445: 
1.90      albertel  446: 	if ($hdnflag || lc($hidden) eq 'yes') {
                    447: 	    $hiddenurl{$rid}=1;
1.91      albertel  448: 	}
                    449: 	if (!$hdnflag && lc($hidden) eq 'no') {
1.90      albertel  450: 	    delete($hiddenurl{$rid});
                    451: 	}
1.91      albertel  452: 
1.85      albertel  453: 	my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
                    454: 	if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
1.116     www       455: 	if (($retfrid eq '') && ($hash{'src_'.$rid})
1.85      albertel  456: 	    && ($hash{'src_'.$rid}!~/\.sequence$/)) {
1.116     www       457: 	    $retfrid=$rid;
1.85      albertel  458: 	}
                    459: 	if (defined($hash{'conditions_'.$rid})) {
                    460: 	    $hash{'conditions_'.$rid}=simplify(
1.103     albertel  461:            '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1.85      albertel  462: 	} else {
                    463: 	    $hash{'conditions_'.$rid}=$sofar;
                    464: 	}
1.107     albertel  465: 
                    466: 	# if the expression is just the 0th condition keep it
                    467: 	# otherwise leave a pointer to this condition expression
                    468: 	$newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
                    469: 
1.85      albertel  470: 	if (defined($hash{'is_map_'.$rid})) {
                    471: 	    if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
                    472: 		$sofar=$newsofar=
                    473: 		    &traceroute($sofar,
1.126     albertel  474: 				$hash{'map_start_'.$hash{'src_'.$rid}},
                    475: 				$beenhere,
1.85      albertel  476: 				$encflag || $encurl{$rid},
                    477: 				$hdnflag || $hiddenurl{$rid});
                    478: 	    }
                    479: 	}
                    480: 	if (defined($hash{'to_'.$rid})) {
1.106     albertel  481: 	    foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.2       www       482: 		my $further=$sofar;
1.106     albertel  483:                 if ($hash{'undercond_'.$id}) {
                    484: 		    if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
1.105     albertel  485: 			$further=simplify('('.'_'.$rid.')&('.
1.106     albertel  486: 					  $hash{'condid_'.$hash{'undercond_'.$id}}.')');
1.85      albertel  487: 		    } else {
1.114     www       488: 			$errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
1.85      albertel  489: 		    }
1.2       www       490:                 }
1.106     albertel  491:                 $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
1.81      albertel  492: 				      $encflag,$hdnflag);
1.85      albertel  493: 	    }
                    494: 	}
1.2       www       495:     }
1.81      albertel  496:     return $newsofar;
1.2       www       497: }
1.1       www       498: 
1.19      www       499: # ------------------------------ Cascading conditions, quick access, parameters
1.4       www       500: 
                    501: sub accinit {
                    502:     my ($uri,$short,$fn)=@_;
                    503:     my %acchash=();
                    504:     my %captured=();
                    505:     my $condcounter=0;
1.5       www       506:     $acchash{'acc.cond.'.$short.'.0'}=0;
1.104     albertel  507:     foreach my $key (keys(%hash)) {
                    508: 	if ($key=~/^conditions/) {
                    509: 	    my $expr=$hash{$key};
1.109     albertel  510: 	    # try to find and factor out common sub-expressions
1.105     albertel  511: 	    foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
1.104     albertel  512: 		my $orig=$sub;
1.109     albertel  513: 
                    514: 		my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
                    515: 		next if (!defined($factor));
                    516: 
                    517: 		$sub=~s/\Q$factor\E//g;
1.85      albertel  518: 		$sub=~s/^\(/\($factor\(/;
                    519: 		$sub.=')';
                    520: 		$sub=simplify($sub);
1.109     albertel  521: 		$expr=~s/\Q$orig\E/$sub/;
1.85      albertel  522: 	    }
1.104     albertel  523: 	    $hash{$key}=$expr;
1.85      albertel  524: 	    unless (defined($captured{$expr})) {
                    525: 		$condcounter++;
                    526: 		$captured{$expr}=$condcounter;
                    527: 		$acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
                    528: 	    } 
1.104     albertel  529: 	} elsif ($key=~/^param_(\d+)\.(\d+)/) {
1.86      albertel  530: 	    my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
                    531: 						    $hash{'src_'.$1.'.'.$2});
1.104     albertel  532: 	    foreach my $param (split(/\&/,$hash{$key})) {
                    533: 		my ($typename,$value)=split(/\=/,$param);
1.85      albertel  534: 		my ($type,$name)=split(/\:/,$typename);
1.114     www       535: 		$parmhash{$prefix.'.'.&unescape($name)}=
                    536: 		    &unescape($value);
                    537: 		$parmhash{$prefix.'.'.&unescape($name).'.type'}=
                    538: 		    &unescape($type);
1.85      albertel  539: 	    }
                    540: 	}
1.26      harris41  541:     }
1.104     albertel  542:     foreach my $key (keys(%hash)) {
                    543: 	if ($key=~/^ids/) {
                    544: 	    foreach my $resid (split(/\,/,$hash{$key})) {
1.85      albertel  545: 		my $uri=$hash{'src_'.$resid};
1.100     albertel  546: 		my ($uripath,$urifile) =
                    547: 		    &Apache::lonnet::split_uri_for_cond($uri);
1.85      albertel  548: 		if ($uripath) {
                    549: 		    my $uricond='0';
                    550: 		    if (defined($hash{'conditions_'.$resid})) {
                    551: 			$uricond=$captured{$hash{'conditions_'.$resid}};
                    552: 		    }
                    553: 		    if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
                    554: 			if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
                    555: 			    /(\&\Q$urifile\E\:[^\&]*)/) {
                    556: 			    my $replace=$1;
                    557: 			    my $regexp=$replace;
                    558: 			    #$regexp=~s/\|/\\\|/g;
1.105     albertel  559: 			    $acchash{'acc.res.'.$short.'.'.$uripath} =~
1.104     albertel  560: 				s/\Q$regexp\E/$replace\|$uricond/;
1.85      albertel  561: 			} else {
                    562: 			    $acchash{'acc.res.'.$short.'.'.$uripath}.=
                    563: 				$urifile.':'.$uricond.'&';
                    564: 			}
                    565: 		    } else {
                    566: 			$acchash{'acc.res.'.$short.'.'.$uripath}=
                    567: 			    '&'.$urifile.':'.$uricond.'&';
                    568: 		    }
                    569: 		} 
                    570: 	    }
                    571: 	}
1.26      harris41  572:     }
1.24      www       573:     $acchash{'acc.res.'.$short.'.'}='&:0&';
1.8       www       574:     my $courseuri=$uri;
                    575:     $courseuri=~s/^\/res\///;
1.131   ! raeburn   576:     my $regexp = 1;
        !           577:     &Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp);
1.128     raeburn   578:     &Apache::lonnet::appenv(\%acchash);
1.4       www       579: }
                    580: 
1.73      www       581: # ---------------- Selectively delete from randompick maps and hidden url parms
1.29      www       582: 
1.73      www       583: sub hiddenurls {
1.31      www       584:     my $randomoutentry='';
1.29      www       585:     foreach my $rid (keys %randompick) {
                    586:         my $rndpick=$randompick{$rid};
                    587:         my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
                    588: # ------------------------------------------- put existing resources into array
                    589:         my @currentrids=();
1.106     albertel  590:         foreach my $key (sort(keys(%hash))) {
                    591: 	    if ($key=~/^src_($mpc\.\d+)/) {
1.29      www       592: 		if ($hash{'src_'.$1}) { push @currentrids, $1; }
                    593:             }
                    594:         }
1.50      albertel  595: 	# rids are number.number and we want to numercially sort on 
                    596:         # the second number
                    597: 	@currentrids=sort {
                    598: 	    my (undef,$aid)=split(/\./,$a);
                    599: 	    my (undef,$bid)=split(/\./,$b);
                    600: 	    $aid <=> $bid;
                    601: 	} @currentrids;
1.29      www       602:         next if ($#currentrids<$rndpick);
                    603: # -------------------------------- randomly eliminate the ones that should stay
1.50      albertel  604: 	my (undef,$id)=split(/\./,$rid);
1.51      www       605:         if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
1.50      albertel  606: 	my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
1.58      albertel  607: 	&Apache::lonnet::setup_random_from_rndseed($rndseed);
1.50      albertel  608: 	my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
                    609:         for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
                    610: 	#&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
1.29      www       611: # -------------------------------------------------------- delete the leftovers
                    612:         for (my $k=0; $k<=$#currentrids; $k++) {
                    613:             if ($currentrids[$k]) {
                    614: 		$hash{'randomout_'.$currentrids[$k]}=1;
1.32      www       615:                 my ($mapid,$resid)=split(/\./,$currentrids[$k]);
                    616:                 $randomoutentry.='&'.
1.86      albertel  617: 		    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
                    618: 						 $resid,
                    619: 						 $hash{'src_'.$currentrids[$k]}
                    620: 						 ).'&';
1.29      www       621:             }
                    622:         }
1.31      www       623:     }
1.73      www       624: # ------------------------------ take care of explicitly hidden urls or folders
                    625:     foreach my $rid (keys %hiddenurl) {
                    626: 	$hash{'randomout_'.$rid}=1;
                    627: 	my ($mapid,$resid)=split(/\./,$rid);
                    628: 	$randomoutentry.='&'.
1.86      albertel  629: 	    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
                    630: 					 $hash{'src_'.$rid}).'&';
1.73      www       631:     }
                    632: # --------------------------------------- append randomout entry to environment
1.31      www       633:     if ($randomoutentry) {
1.128     raeburn   634: 	&Apache::lonnet::appenv({'acc.randomout' => $randomoutentry});
1.29      www       635:     }
                    636: }
                    637: 
1.1       www       638: # ---------------------------------------------------- Read map and all submaps
                    639: 
                    640: sub readmap {
1.85      albertel  641:     my $short=shift;
                    642:     $short=~s/^\///;
1.108     albertel  643:     my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
1.85      albertel  644:     my $fn=$cenv{'fn'};
                    645:     my $uri;
                    646:     $short=~s/\//\_/g;
                    647:     unless ($uri=$cenv{'url'}) { 
                    648: 	&Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    649: 				 "Could not load course $short.</font>"); 
1.114     www       650: 	return ('',&mt('No course data available.'));;
1.85      albertel  651:     }
                    652:     @cond=('true:normal');
1.96      albertel  653: 
                    654:     open(LOCKFILE,">$fn.db.lock");
                    655:     my $lock=0;
                    656:     if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
                    657: 	$lock=1;
                    658: 	unlink($fn.'.db');
                    659: 	unlink($fn.'_symb.db');
                    660: 	unlink($fn.'.state');
                    661: 	unlink($fn.'parms.db');
                    662:     }
1.85      albertel  663:     undef %randompick;
                    664:     undef %hiddenurl;
                    665:     undef %encurl;
1.116     www       666:     $retfrid='';
1.96      albertel  667:     if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
1.85      albertel  668: 	(tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
                    669: 	%hash=();
                    670: 	%parmhash=();
                    671: 	$errtext='';
                    672: 	$pc=0;
1.122     albertel  673: 	&clear_mapalias_count();
1.85      albertel  674: 	&processversionfile(%cenv);
                    675: 	my $furi=&Apache::lonnet::clutter($uri);
                    676: 	$hash{'src_0.0'}=&versiontrack($furi);
                    677: 	$hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
                    678: 	$hash{'ids_'.$furi}='0.0';
                    679: 	$hash{'is_map_0.0'}=1;
1.124     albertel  680: 	loadmap($uri,'0.0');
1.85      albertel  681: 	if (defined($hash{'map_start_'.$uri})) {
1.128     raeburn   682: 	    &Apache::lonnet::appenv({"request.course.id"  => $short,
                    683: 				     "request.course.fn"  => $fn,
                    684: 				     "request.course.uri" => $uri});
1.116     www       685: 	    $env{'request.course.id'}=$short;
1.85      albertel  686: 	    &traceroute('0',$hash{'map_start_'.$uri},'&');
                    687: 	    &accinit($uri,$short,$fn);
                    688: 	    &hiddenurls();
                    689: 	}
1.122     albertel  690: 	$errtext .= &get_mapalias_errors();
1.62      www       691: # ------------------------------------------------------- Put versions into src
1.106     albertel  692: 	foreach my $key (keys(%hash)) {
1.110     albertel  693: 	    if ($key=~/^src_/) {
1.106     albertel  694: 		$hash{$key}=&putinversion($hash{$key});
1.110     albertel  695: 	    } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
                    696: 		my ($type, $url) = ($1,$2);
                    697: 		my $value = $hash{$key};
                    698: 		$hash{$type.&putinversion($url)}=$value;
1.85      albertel  699: 	    }
1.61      www       700: 	}
1.74      www       701: # ---------------------------------------------------------------- Encrypt URLs
1.106     albertel  702: 	foreach my $id (keys(%encurl)) {
                    703: #	    $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
                    704: 	    $hash{'encrypted_'.$id}=1;
1.85      albertel  705: 	}
1.74      www       706: # ----------------------------------------------- Close hashes to finally store
                    707: # --------------------------------- Routine must pass this point, no early outs
1.116     www       708: 	$hash{'first_rid'}=$retfrid;
                    709: 	my ($mapid,$resid)=split(/\./,$retfrid);
                    710: 	$hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
                    711: 	my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
                    712: 	$retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
                    713: 	if ($hash{'encrypted_'.$retfrid}) {
                    714: 	    $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
                    715: 	}
1.94      albertel  716: 	$hash{'first_url'}=$retfurl;
1.85      albertel  717: 	unless ((untie(%hash)) && (untie(%parmhash))) {
                    718: 	    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    719: 				     "Could not untie coursemap $fn for $uri.</font>"); 
                    720: 	}
                    721: # ---------------------------------------------------- Store away initial state
                    722: 	{
                    723: 	    my $cfh;
1.88      raeburn   724: 	    if (open($cfh,">$fn.state")) {
1.85      albertel  725: 		print $cfh join("\n",@cond);
                    726: 	    } else {
                    727: 		&Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    728: 					 "Could not write statemap $fn for $uri.</font>"); 
                    729: 	    }
1.96      albertel  730: 	}
                    731: 	flock(LOCKFILE,LOCK_UN);
                    732: 	close(LOCKFILE);
1.85      albertel  733:     } else {
1.87      albertel  734: 	# if we are here it is likely because we are already trying to 
                    735: 	# initialize the course in another child, busy wait trying to 
                    736: 	# tie the hashes for the next 90 seconds, if we succeed forward 
                    737: 	# them on to navmaps, if we fail, throw up the Could not init 
                    738: 	# course screen
1.96      albertel  739: 	if ($lock) {
                    740: 	    # Got the lock but not the DB files
                    741: 	    flock(LOCKFILE,LOCK_UN);
                    742: 	}
1.87      albertel  743: 	untie(%hash);
                    744: 	untie(%parmhash);
1.85      albertel  745: 	&Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    746: 				 "Could not tie coursemap $fn for $uri.</font>"); 
1.87      albertel  747: 	my $i=0;
                    748: 	while($i<90) {
                    749: 	    $i++;
                    750: 	    sleep(1);
1.96      albertel  751: 	    if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
                    752: 		(tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
1.87      albertel  753: 		if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
                    754: 		    $retfurl='/adm/navmaps';
1.128     raeburn   755: 		    &Apache::lonnet::appenv({"request.course.id"  => $short,
                    756: 					     "request.course.fn"  => $fn,
                    757: 					     "request.course.uri" => $uri});
1.87      albertel  758: 		    untie(%hash);
                    759: 		    untie(%parmhash);
                    760: 		    last;
                    761: 		}
                    762: 	    }
                    763: 	    untie(%hash);
                    764: 	    untie(%parmhash);
                    765: 	}
1.96      albertel  766: 	flock(LOCKFILE,LOCK_UN);
                    767: 	close(LOCKFILE);
1.1       www       768:     }
1.89      albertel  769:     &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
1.46      www       770: # ------------------------------------------------- Check for critical messages
                    771: 
1.89      albertel  772:     my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
                    773: 				   $env{'user.name'});
1.46      www       774:     if ($what[0]) {
                    775: 	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
                    776: 	    $retfurl='/adm/email?critical=display';
                    777:         }
                    778:     }
1.85      albertel  779:     return ($retfurl,$errtext);
1.1       www       780: }
1.15      www       781: 
                    782: # ------------------------------------------------------- Evaluate state string
                    783: 
                    784: sub evalstate {
1.89      albertel  785:     my $fn=$env{'request.course.fn'}.'.state';
1.80      albertel  786:     my $state='';
1.15      www       787:     if (-e $fn) {
1.80      albertel  788: 	my @conditions=();
                    789: 	{
1.115     raeburn   790: 	    open(my $fh,"<$fn");
1.80      albertel  791: 	    @conditions=<$fh>;
1.115     raeburn   792:             close($fh);
1.80      albertel  793: 	}  
                    794: 	my $safeeval = new Safe;
                    795: 	my $safehole = new Safe::Hole;
                    796: 	$safeeval->permit("entereval");
                    797: 	$safeeval->permit(":base_math");
                    798: 	$safeeval->deny(":base_io");
                    799: 	$safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
                    800: 	foreach my $line (@conditions) {
                    801: 	    chomp($line);
                    802: 	    my ($condition,$weight)=split(/\:/,$line);
                    803: 	    if ($safeeval->reval($condition)) {
                    804: 		if ($weight eq 'force') {
                    805: 		    $state.='3';
                    806: 		} else {
                    807: 		    $state.='2';
                    808: 		}
                    809: 	    } else {
                    810: 		if ($weight eq 'stop') {
                    811: 		    $state.='0';
                    812: 		} else {
                    813: 		    $state.='1';
                    814: 		}
                    815: 	    }
                    816: 	}
1.15      www       817:     }
1.128     raeburn   818:     &Apache::lonnet::appenv({'user.state.'.$env{'request.course.id'} => $state});
1.15      www       819:     return $state;
                    820: }
                    821: 
1.122     albertel  822: {
                    823:     my %mapalias_cache;
                    824:     sub count_mapalias {
                    825: 	my ($value,$resid) = @_;
                    826:  	push(@{ $mapalias_cache{$value} }, $resid);
                    827:     }
                    828: 
                    829:     sub get_mapalias_errors {
                    830: 	my $error_text;
                    831: 	foreach my $mapalias (sort(keys(%mapalias_cache))) {
                    832: 	    next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
                    833: 	    my $count;
                    834: 	    my $which =
                    835: 		join('</li><li>', 
                    836: 		     map {
                    837: 			 my $id = $_;
                    838: 			 if (exists($hash{'src_'.$id})) {
                    839: 			     $count++;
                    840: 			 }
                    841: 			 my ($mapid) = split(/\./,$id);
1.125     albertel  842:                          &mt('Resource "[_1]" <br /> in Map "[_2]"',
                    843: 			     $hash{'title_'.$id},
1.122     albertel  844: 			     $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
                    845: 		     } (@{ $mapalias_cache{$mapalias} }));
                    846: 	    next if ($count < 2);
                    847: 	    $error_text .= '<div class="LC_error">'.
                    848: 		&mt('Error: Found the mapalias "[_1]" defined multiple times.',
                    849: 		    $mapalias).
                    850: 		'</div><ul><li>'.$which.'</li></ul>';
                    851: 	}
                    852: 	&clear_mapalias_count();
                    853: 	return $error_text;
                    854:     }
                    855:     sub clear_mapalias_count {
                    856: 	undef(%mapalias_cache);
                    857:     }
                    858: }
1.1       www       859: 1;
                    860: __END__
                    861: 
1.26      harris41  862: =head1 NAME
                    863: 
                    864: Apache::lonuserstate - Construct and maintain state and binary representation
                    865: of course for user
                    866: 
                    867: =head1 SYNOPSIS
                    868: 
                    869: Invoked by lonroles.pm.
                    870: 
                    871: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
                    872: 
                    873: =head1 INTRODUCTION
                    874: 
                    875: This module constructs and maintains state and binary representation
                    876: of course for user.
                    877: 
                    878: This is part of the LearningOnline Network with CAPA project
                    879: described at http://www.lon-capa.org.
                    880: 
1.129     jms       881: =head1 SUBROUTINES
1.26      harris41  882: 
1.129     jms       883: =over
1.26      harris41  884: 
1.129     jms       885: =item loadmap()
1.26      harris41  886: 
1.129     jms       887: Loads map from disk
1.26      harris41  888: 
1.129     jms       889: =item simplify()
1.26      harris41  890: 
1.129     jms       891: Simplify expression
1.26      harris41  892: 
1.129     jms       893: =item traceroute()
1.26      harris41  894: 
1.129     jms       895: Build condition hash
1.26      harris41  896: 
1.129     jms       897: =item accinit()
1.26      harris41  898: 
1.129     jms       899: Cascading conditions, quick access, parameters
1.26      harris41  900: 
1.129     jms       901: =item readmap()
1.26      harris41  902: 
1.129     jms       903: Read map and all submaps
1.1       www       904: 
1.129     jms       905: =item evalstate()
1.1       www       906: 
1.129     jms       907: Evaluate state string
1.1       www       908: 
1.26      harris41  909: =back
1.1       www       910: 
1.26      harris41  911: =cut

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