# The LearningOnline Network with CAPA
# Construct and maintain state and binary representation of course for user
#
# $Id: lonuserstate.pm,v 1.170 2022/10/05 16:11:25 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
###
package Apache::lonuserstate;
# ------------------------------------------------- modules used by this module
use strict;
use HTML::TokeParser;
use Apache::lonnet;
use Apache::lonlocal;
use Apache::loncommon();
use GDBM_File;
use Apache::lonmsg;
use Safe;
use Safe::Hole;
use Opcode;
use Apache::lonenc;
use Fcntl qw(:flock);
use LONCAPA qw(:DEFAULT :match);
use File::Basename;
# ---------------------------------------------------- Globals for this package
my $pc; # Package counter is this what 'Guts' calls the map counter?
my %hash; # The big tied hash
my %parmhash;# The hash with the parameters
my @cond; # Array with all of the conditions
my $errtext; # variable with all errors
my $retfrid; # variable with the very first RID in the course
my $retfurl; # first URL
my %randompick; # randomly picked resources
my %randompickseed; # optional seed for randomly picking resources
my %randomorder; # maps to order contents randomly
my %randomizationcode; # code used to grade folder for bubblesheet exam
my %encurl; # URLs in this folder are supposed to be encrypted
my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
my %deeplinkout; # this URL (or complete folder) unavailable in deep-link session
my %rescount; # count of unhidden items in each map
my %mapcount; # count of unhidden maps in each map
# ----------------------------------- Remove version from URL and store in hash
sub versionerror {
my ($uri,$usedversion,$unusedversion)=@_;
return '<br />'.&mt('Version discrepancy: resource [_1] included in both version [_2] and version [_3]. Using version [_2].',
$uri,$usedversion,$unusedversion).'<br />';
}
# Removes the version number from a URI and returns the resulting
# URI (e.g. mumbly.version.stuff => mumbly.stuff).
#
# If the URI has not been seen with a versio before the
# hash{'version_'.resultingURI} is set to the version number.
# If the URI has been seen and the version does not match and error
# is added to the error string.
#
# Parameters:
# URI potentially with a version.
# Returns:
# URI with the version cut out.
# See above for side effects.
#
sub versiontrack {
my $uri=shift;
if ($uri=~/\.(\d+)\.\w+$/) {
my $version=$1;
$uri=~s/\.\d+\.(\w+)$/\.$1/;
unless ($hash{'version_'.$uri}) {
$hash{'version_'.$uri}=$version;
} elsif ($version!=$hash{'version_'.$uri}) {
$errtext.=&versionerror($uri,$hash{'version_'.$uri},$version);
}
}
return $uri;
}
# -------------------------------------------------------------- Put in version
sub putinversion {
my $uri=shift;
my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
if ($hash{'version_'.$uri}) {
my $version=$hash{'version_'.$uri};
if ($version eq 'mostrecent') { return $uri; }
if ($version eq &Apache::lonnet::getversion(
&Apache::lonnet::filelocation('',$uri)))
{ return $uri; }
$uri=~s/\.(\w+)$/\.$version\.$1/;
}
&Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
return $uri;
}
# ----------------------------------------- Processing versions file for course
sub processversionfile {
my %cenv=@_;
my %versions=&Apache::lonnet::dump('resourceversions',
$cenv{'domain'},
$cenv{'num'});
foreach my $ver (keys(%versions)) {
if ($ver=~/^error\:/) { return; }
$hash{'version_'.$ver}=$versions{$ver};
}
}
# --------------------------------------------------------- Loads from disk
#
# Loads a map file.
# Note that this may implicitly recurse via parse_resource if one of the resources
# is itself composed.
#
# Parameters:
# uri - URI of the map file.
# parent_rid - Resource id in the map of the parent resource (0.0 for the top level map)
# courseid - Course id for the course for which the map is being loaded
#
sub loadmap {
my ($uri,$parent_rid,$courseid)=@_;
# Is the map already included?
if ($hash{'map_pc_'.$uri}) {
$errtext.='<p class="LC_error">'.
&mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
'</p>';
return;
}
# Register the resource in it's map_pc_ [for the URL]
# map_id.nnn is the nesting level -> to the URI.
$pc++;
my $lpc=$pc;
$hash{'map_pc_'.$uri}=$lpc;
$hash{'map_id_'.$lpc}=$uri;
# If the parent is of the form n.m hang this map underneath it in the
# map hierarchy.
if ($parent_rid =~ /^(\d+)\.\d+$/) {
my $parent_pc = $1;
if (defined($hash{'map_hierarchy_'.$parent_pc})) {
$hash{'map_hierarchy_'.$lpc}=$hash{'map_hierarchy_'.$parent_pc}.','.
$parent_pc;
} else {
$hash{'map_hierarchy_'.$lpc}=$parent_pc;
}
}
# Determine and check filename of the sequence we need to read:
my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
my $ispage=($fn=~/\.page$/);
# We can only nest sequences or pages. Anything else is an illegal nest.
unless (($fn=~/\.sequence$/) || $ispage) {
$errtext.='<br />'.&mt('Invalid map: [_1]',"<tt>$fn</tt>");
return;
}
# Read the XML that constitutes the file.
my $instr=&Apache::lonnet::getfile($fn);
if ($instr eq -1) {
$errtext.= '<br />'
.&mt('Map not loaded: The file [_1] does not exist.',
"<tt>$fn</tt>");
$hash{'map_type_'.$lpc}='none';
if (&is_advanced($courseid)) {
$errtext .= &error_detail($parent_rid,$courseid,$ispage,$uri);
}
return;
}
# Successfully got file, parse it
# parse for parameter processing.
# Note that these are <param... / > tags
# so we only care about 'S' (tag start) nodes.
my $parser = HTML::TokeParser->new(\$instr);
$parser->attr_encoded(1);
# first get all parameters
while (my $token = $parser->get_token) {
next if ($token->[0] ne 'S');
if ($token->[1] eq 'param') {
&parse_param($token,$lpc);
}
}
# Get set to take another pass through the XML:
# for resources and links.
$parser = HTML::TokeParser->new(\$instr);
$parser->attr_encoded(1);
my $linkpc=0;
$fn=~/\.(\w+)$/;
$hash{'map_type_'.$lpc}=$1;
my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
# Parse the resources, link and condition tags.
# Note that if randomorder or random select is chosen the links and
# conditions are meaningless but are determined by the randomization.
# This is handled in the next chunk of code.
my @map_ids;
my $codechecked;
$rescount{$lpc} = 0;
$mapcount{$lpc} = 0;
while (my $token = $parser->get_token) {
next if ($token->[0] ne 'S');
# Resource
if ($token->[1] eq 'resource') {
my $resource_id = &parse_resource($token,$lpc,$ispage,$uri,$courseid);
if (defined $resource_id) {
push(@map_ids, $resource_id);
if ($hash{'src_'.$lpc.'.'.$resource_id}) {
$rescount{$lpc} ++;
if (($hash{'src_'.$lpc.'.'.$resource_id}=~/\.sequence$/) ||
($hash{'src_'.$lpc.'.'.$resource_id}=~/\.page$/)) {
$mapcount{$lpc} ++;
}
}
unless ($codechecked) {
my $startsymb =
&Apache::lonnet::encode_symb($hash{'map_id_'.$lpc},$resource_id,
$hash{'src_'."$lpc.$resource_id"});
my $code =
&Apache::lonnet::EXT('resource.0.examcode',$startsymb,undef,undef,
undef,undef,$courseid);
if ($code) {
$randomizationcode{$parent_rid} = $code;
}
$codechecked = 1;
}
}
# Link
} elsif ($token->[1] eq 'link' && !$randomize) {
&make_link(++$linkpc,$lpc,$token->[2]->{'to'},
$token->[2]->{'from'},
$token->[2]->{'condition'}); # note ..condition may be undefined.
# condition
} elsif ($token->[1] eq 'condition' && !$randomize) {
&parse_condition($token,$lpc);
}
}
undef($codechecked);
# Handle randomization and random selection
if ($randomize) {
unless (&is_advanced($courseid)) {
# Order of resources is not randomized if user has and advanced role in the course.
my $seed;
# If the map's random seed parameter has been specified
# it is used as the basis for computing the seed ...
if (defined($randompickseed{$parent_rid})) {
$seed = $randompickseed{$parent_rid};
} else {
# Otherwise the parent's fully encoded symb is used.
my ($mapid,$resid)=split(/\./,$parent_rid);
my $symb=
&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
$resid,$hash{'src_'.$parent_rid});
$seed = $symb;
}
# TODO: Here for sure we need to pass along the username/domain
# so that we can impersonate users in lonprintout e.g.
my $setcode;
if (defined($randomizationcode{$parent_rid})) {
if ($env{'form.CODE'} eq '') {
$env{'form.CODE'} = $randomizationcode{$parent_rid};
$setcode = 1;
}
}
my $rndseed=&Apache::lonnet::rndseed($seed);
&Apache::lonnet::setup_random_from_rndseed($rndseed);
if ($setcode) {
undef($env{'form.CODE'});
undef($setcode);
}
# Take the set of map ids we have decoded and permute them to a
# random order based on the seed set above. All of this is
# processing the randomorder parameter if it is set, not
# randompick.
@map_ids=&Math::Random::random_permutation(@map_ids);
}
my $from = shift(@map_ids);
my $from_rid = $lpc.'.'.$from;
$hash{'map_start_'.$uri} = $from_rid;
$hash{'type_'.$from_rid}='start';
# Create links to reflect the random re-ordering done above.
# In the code to process the map XML, we did not process links or conditions
# if randomorder was set. This means that for an instructor to choose
while (my $to = shift(@map_ids)) {
&make_link(++$linkpc,$lpc,$to,$from);
my $to_rid = $lpc.'.'.$to;
$hash{'type_'.$to_rid}='normal';
$from = $to;
$from_rid = $to_rid;
}
$hash{'map_finish_'.$uri}= $from_rid;
$hash{'type_'.$from_rid}='finish';
}
$parser = HTML::TokeParser->new(\$instr);
$parser->attr_encoded(1);
# last parse out the mapalias params. These provide mnemonic
# tags to resources that can be used in conditions
while (my $token = $parser->get_token) {
next if ($token->[0] ne 'S');
if ($token->[1] eq 'param') {
&parse_mapalias_param($token,$lpc);
}
}
}
sub is_advanced {
my ($courseid) = @_;
my $advanced;
if ($env{'request.course.id'}) {
$advanced = (&Apache::lonnet::allowed('adv') eq 'F');
} else {
$env{'request.course.id'} = $courseid;
$advanced = (&Apache::lonnet::allowed('adv') eq 'F');
$env{'request.course.id'} = '';
}
return $advanced;
}
sub error_detail {
my ($parent_rid,$courseid,$ispage,$uri) = @_;
my $errinfo;
if ($courseid) {
my $courseurl = &Apache::lonnet::courseid_to_courseurl($courseid);
if ($parent_rid =~ /^(\d+)\.(\d+)$/) {
my ($parent_pc,$parent_id) = ($1,$2);
my ($parent_type,$published,$uploaded,$canedit,$role,$switchserver,$audom,$auname,
$editfile,$filerole,$fileswitch,$audomfile,$aunamefile);
if (($parent_pc eq '0') && ($hash{'map_id_1'} =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$})) {
($audomfile,$aunamefile) = ($1,$2);
($editfile,$filerole,$fileswitch) = &canedit_published($audomfile,$aunamefile);
if ($fileswitch) {
unless ((&Apache::lonnet::will_trust('othcoau',$env{'user.domain'},$audomfile)) &&
(&Apache::lonnet::will_trust('coaurem',$audomfile,$env{'user.domain'}))) {
undef($editfile);
}
}
$errinfo = &mt('Top level published sequence file is missing.');
} else {
if ($parent_pc eq '1') {
if ($hash{'map_id_1'} eq "/uploaded$courseurl/default.sequence") {
$uploaded = 1;
if (&Apache::lonnet::allowed('mdc',$courseid)) {
$canedit = 1;
}
$errinfo = &mt('Map is referenced in the top level ([_1]Main Content[_2]) folder.',
'<span class="LC_cusr_emph">','</span>');
} elsif ($hash{'map_id_1'} =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$}) {
($audom,$auname) = ($1,$2);
($canedit,$role,$switchserver) = &canedit_published($audom,$auname);
$published = 1;
$errinfo = &mt('Map is referenced in the top level published sequence file.');
}
} else {
if ($hash{'map_id_'.$parent_pc} =~ m{^\Q/uploaded$courseurl/default_\E\d+\.(sequence|page)$}) {
$uploaded = 1;
if (&Apache::lonnet::allowed('mdc',$courseid)) {
$canedit = 1;
}
} elsif ($hash{'map_id_'.$parent_pc} =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$}) {
($audom,$auname) = ($1,$2);
($canedit,$role,$switchserver) = &canedit_published($audom,$auname);
$published = 1;
}
if (exists($hash{'ids_'.$hash{'map_id_'.$parent_pc}})) {
$parent_type = $hash{'map_type_'.$parent_pc};
if ($published) {
$errinfo = &mt("Map is referenced in the published $parent_type file: [_1].",
'<span class="LC_cusr_emph">'.$hash{'map_id_'.$parent_pc}.'</span>');
} else {
my $title = $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$parent_pc}}};
if ($title ne '') {
my $mapdesc;
if ($parent_type eq 'sequence') {
$mapdesc = 'folder';
} else {
$mapdesc = 'composite page';
}
$errinfo = &mt("Map is referenced in the $mapdesc named: [_1].",
'<span class="LC_cusr_emph">'.$title.'</span>');
}
my @containers = split(/,/,$hash{'map_hierarchy_'.$parent_pc});
shift(@containers);
my $folderpath;
foreach my $id (@containers) {
my $name;
if ($id == 1) {
$name = &mt('Main Content');
} elsif ($hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$id}}} ne '') {
$name = $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$id}}};
}
if ($name ne '') {
$folderpath .= $name.' » ';
}
}
if ($title eq '') {
$folderpath =~ s/\Q » \E$//;
} else {
$folderpath .= $title;
}
if ($folderpath) {
$errinfo .= '<br />'.&mt('Hierarchy is: [_1]',
'<span class="LC_cusr_emph">'.$folderpath.'</span>');
}
}
}
}
if ($uri =~ m{^/res/($match_domain)/($match_username)/.+\.(sequence|page)$}) {
($audomfile,$aunamefile) = ($1,$2);
($editfile,$filerole,$fileswitch) = &canedit_published($audomfile,$aunamefile);
if ($fileswitch) {
unless ((&Apache::lonnet::will_trust('othcoau',$env{'user.domain'},$audomfile)) &&
(&Apache::lonnet::will_trust('coaurem',$audomfile,$env{'user.domain'}))) {
undef($editfile);
}
}
}
}
if ($errinfo) {
$errinfo = '<br />'.$errinfo.'<br />';
}
if ($editfile) {
if ($errinfo ne '') {
$errinfo .= '<br />';
}
if ($canedit) {
$errinfo .= &mt('One way to rectify this problem is to create and publish the missing file');
} else {
$errinfo .= &mt('To rectify this problem, create and publish the missing file');
}
my $fileurl = $uri;
$fileurl =~s{^/res/}{/priv/};
if ($fileswitch) {
my $rolename = &Apache::lonnet::plaintext($filerole);
my $rolecode;
if ($filerole eq 'au') {
$rolecode = 'au./'.$audomfile.'/';
} else {
$rolecode = $filerole.'./'.$audomfile.'/'.$aunamefile;
}
$errinfo .= '.<br />'.&mt('You will need to [_1]switch server[_2].',
'<a href="/adm/switchserver?otherserver='.$switchserver.'&role='.$rolecode.
'&origurl='.&escape($fileurl).'">','</a>');
} else {
&js_escape(\$fileurl);
$errinfo .= ': <a href="javascript:go('."'$fileurl'".');">'.&mt('Create the missing file').'</a>';
}
}
if ($canedit) {
if ($errinfo ne '') {
$errinfo .= '<br />';
}
if ($published) {
my $rolename = &Apache::lonnet::plaintext($role);
my $rolecode;
if ($role eq 'au') {
$rolecode = 'au./'.$audom.'/';
} else {
$rolecode = $role.'./'.$audom.'/'.$auname;
}
if ($editfile) {
$errinfo .= &mt('Another way is to edit the parent map to remove the reference to the missing file');
} else {
$errinfo .= &mt('To rectify this problem edit the parent map to remove the reference to the missing file');
}
my $mapurl = $hash{'map_id_'.$parent_pc};
$mapurl =~s{^/res/}{/priv/};
if ($switchserver) {
$errinfo .= '.<br />';
if ((&Apache::lonnet::will_trust('othcoau',$env{'user.domain'},$audom)) &&
(&Apache::lonnet::will_trust('coaurem',$audom,$env{'user.domain'}))) {
$errinfo .= &mt('You will need to [_1]switch server[_2].',
'<a href="/adm/switchserver?otherserver='.$switchserver.'&role='.$rolecode.
'&origurl='.&escape($mapurl).'">','</a>');
} else {
$errinfo .= &mt('Session switch required but prohibited.');
}
} else {
&js_escape(\$mapurl);
$errinfo .= ': <a href="javascript:go('."'$mapurl'".');">'.&mt('Edit the map').'</a>';
}
} elsif ($uploaded && $courseid) {
my ($dest,$linktext);
my $crstype = &Apache::loncommon::course_type($courseid);
if ($parent_pc eq '1') {
$dest = '/adm/coursedocs?folderpath='.&escape('default&Main%20Content:::::');
$linktext = &mt('Edit Folder');
} elsif ($hash{'ids_'.$hash{'map_id_'.$parent_pc}} =~ /^(\d+)\.(\d+)$/) {
my ($editmap,$editidx) = ($1,$2);
my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$editmap},
$editidx,$hash{'map_id_'.$parent_pc});
$dest = '/adm/coursedocs?command=directnav&symb='.&escape($symb);
if ($parent_type eq 'sequence') {
$linktext = &mt('Edit Folder');
} else {
$linktext = &mt('Edit Composite Page');
}
} else {
$dest = '/adm/coursedocs?folderpath='.&escape('default&Main%20Content:::::');
$linktext = &mt("Edit $crstype");
}
if ($editfile) {
$errinfo .= &mt("Another way is to use the $crstype Editor to delete the reference to the missing file");
} else {
$errinfo .= &mt("To rectify this problem use the $crstype Editor to delete the reference to the missing file");
}
$errinfo .= ': <a href="javascript:go('."'$dest'".');">'.$linktext.'</a>';
}
$errinfo .= '<br />';
}
}
}
return $errinfo;
}
sub canedit_published {
my ($audom,$auname) = @_;
my ($canedit,$role,$switchserver);
my $now = time;
if (($auname eq $env{'user.name'}) && ($audom eq $env{'user.domain'})) {
if (exists($env{"user.role.au./$audom/"})) {
my ($start,$end) = split(/\./,$env{"user.role.au./$audom/"});
unless (($end && $end < $now) || ($start && $start > $now)) {
$canedit = 1;
$role = 'au';
}
}
}
unless ($canedit) {
foreach my $possrole ('ca','aa') {
if (exists($env{"user.role.$possrole./$audom/$auname"})) {
my ($end,$start) = split(/\./,$env{"user.role.$possrole./$audom/$auname"});
unless (($end && $end < time) || ($start && $start > time)) {
$canedit = 1;
$role = $possrole;
last;
}
}
}
}
if ($canedit) {
my $auhome = &Apache::lonnet::homeserver($auname,$audom);
my @ids=&Apache::lonnet::current_machine_ids();
if (($auhome ne 'no_host') && (!grep(/^\Q$auhome\E$/,@ids))) {
$switchserver = $auhome;
}
}
return ($canedit,$role,$switchserver);
}
# -------------------------------------------------------------------- Resource
#
# Parses a resource tag to produce the value to push into the
# map_ids array.
#
#
# Information about the actual type of resource is provided by the file extension
# of the uri (e.g. .problem, .sequence etc. etc.).
#
# Parameters:
# $token - A token from HTML::TokeParser
# This is an array that describes the most recently parsed HTML item.
# $lpc - Map nesting level (?)
# $ispage - True if this resource is encapsulated in a .page (assembled resourcde).
# $uri - URI of the enclosing resource.
# $courseid - Course id of the course containing the resource being parsed.
# Returns:
# Value of the id attribute of the tag.
#
# Note:
# The token is an array that contains the following elements:
# [0] => 'S' indicating this is a start token
# [1] => 'resource' indicating this tag is a <resource> tag.
# [2] => Hash of attribute =>value pairs.
# [3] => @(keys [2]).
# [4] => unused.
#
# The attributes of the resourcde tag include:
#
# id - The resource id.
# src - The URI of the resource.
# type - The resource type (e.g. start and finish).
# title - The resource title.
sub parse_resource {
my ($token,$lpc,$ispage,$uri,$courseid) = @_;
# I refuse to countenance code like this that has
# such a dirty side effect (and forcing this sub to be called within a loop).
#
# if ($token->[2]->{'type'} eq 'zombie') { next; }
#
# The original code both returns _and_ skips to the next pass of the >caller's<
# loop, that's just dirty.
#
# Zombie resources don't produce anything useful.
if ($token->[2]->{'type'} eq 'zombie') {
return undef;
}
my $rid=$lpc.'.'.$token->[2]->{'id'}; # Resource id in hash is levelcounter.id-in-xml.
# Save the hash element type and title:
$hash{'kind_'.$rid}='res';
$hash{'title_'.$rid}=$token->[2]->{'title'};
# Get the version free URI for the resource.
# If a 'version' attribute was supplied, and this resource's version
# information has not yet been stored, store it.
#
my $turi=&versiontrack($token->[2]->{'src'});
if ($token->[2]->{'version'}) {
unless ($hash{'version_'.$turi}) {
$hash{'version_'.$turi}=$1;
}
}
# Pull out the title and do entity substitution on &colon
# Q: Why no other entity substitutions?
my $title=$token->[2]->{'title'};
$title=~s/\&colon\;/\:/gs;
# I think the point of all this code is to construct a final
# URI that apache and its rewrite rules can use to
# fetch the resource. Thi s sonly necessary if the resource
# is not a page. If the resource is a page then it must be
# assembled (at fetch time?).
if ($ispage) {
if ($token->[2]->{'external'} eq 'true') { # external
$turi=~s{^http\://}{/ext/};
}
} else {
$turi=~/\.(\w+)$/;
my $embstyle=&Apache::loncommon::fileembstyle($1);
if ($token->[2]->{'external'} eq 'true') { # external
$turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//;
} elsif ($turi=~/^\/*uploaded\//) { # uploaded
if (($embstyle eq 'img')
|| ($embstyle eq 'emb')
|| ($embstyle eq 'wrp')) {
$turi='/adm/wrapper'.$turi;
} elsif ($embstyle eq 'ssi') {
#do nothing with these
} elsif ($turi!~/\.(sequence|page)$/) {
$turi='/adm/coursedocs/showdoc'.$turi;
}
} elsif ($turi=~ m{^/adm/$match_domain/$match_courseid/\d+/ext\.tool$}) {
$turi='/adm/wrapper'.$turi;
} elsif ($turi=~/\S/) { # normal non-empty internal resource
my $mapdir=$uri;
$mapdir=~s/[^\/]+$//;
$turi=&Apache::lonnet::hreflocation($mapdir,$turi);
if (($embstyle eq 'img')
|| ($embstyle eq 'emb')
|| ($embstyle eq 'wrp')) {
$turi='/adm/wrapper'.$turi;
}
}
}
# Store reverse lookup, remove query string resource 'ids'_uri => resource id.
# If the URI appears more than one time in the sequence, it's resourcde
# id's are constructed as a comma spearated list.
my $idsuri=$turi;
$idsuri=~s/\?.+$//;
if (defined($hash{'ids_'.$idsuri})) {
$hash{'ids_'.$idsuri}.=','.$rid;
} else {
$hash{'ids_'.$idsuri}=''.$rid;
}
if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard|viewclasslist)$/) {
$turi.='?register=1';
}
# resource id lookup: 'src'_resourc-di => URI decorated with a query
# parameter as above if necessary due to the resource type.
$hash{'src_'.$rid}=$turi;
# Mark the external-ness of the resource:
if ($token->[2]->{'external'} eq 'true') {
$hash{'ext_'.$rid}='true:';
} else {
$hash{'ext_'.$rid}='false:';
}
# If the resource is a start/finish resource set those
# entries in the has so that navigation knows where everything starts.
# TODO? If there is a malformed sequence that has no start or no finish
# resource, should this be detected and errors thrown? How would such a
# resource come into being other than being manually constructed by a person
# and then uploaded? Could that happen if an author decided a sequence was almost
# right edited it by hand and then reuploaded it to 'fix it' but accidently cut the
# start or finish resources?
#
# All resourcess also get a type_id => (start | finish | normal) hash entr.
#
if ($token->[2]->{'type'}) {
$hash{'type_'.$rid}=$token->[2]->{'type'};
if ($token->[2]->{'type'} eq 'start') {
$hash{'map_start_'.$uri}="$rid";
}
if ($token->[2]->{'type'} eq 'finish') {
$hash{'map_finish_'.$uri}="$rid";
}
} else {
$hash{'type_'.$rid}='normal';
}
# Sequences end pages are constructed entities. They require that the
# map that defines _them_ be loaded as well into the hash...with this resourcde
# as the base of the nesting.
# Resources like that are also marked with is_map_id => 1 entries.
#
if (($turi=~/\.sequence$/) ||
($turi=~/\.page$/)) {
$hash{'is_map_'.$rid}=1;
if ((!$hiddenurl{$rid}) || (&is_advanced($courseid))) {
&loadmap($turi,$rid,$courseid);
}
}
return $token->[2]->{'id'};
}
#-------------------------------------------------------------------- link
# Links define how you are allowed to move from one resource to another.
# They are the transition edges in the directed graph that a map is.
# This sub takes informatino from a <link> tag and constructs the
# navigation bits and pieces of a map. There is no requirement that the
# resources that are linke are already defined, however clearly the map is
# badly broken if they are not _eventually_ defined.
#
# Note that links can be unconditional or conditional.
#
# Parameters:
# linkpc - The link counter for this level of map nesting (this is
# reset to zero by loadmap prior to starting to process
# links for map).
# lpc - The map level ocounter (how deeply nested this map is in
# the hierarchy of maps that are recursively read in.
# to - resource id (within the XML) of the target of the edge.
# from - resource id (within the XML) of the source of the edge.
# condition- id of condition associated with the edge (also within the XML).
#
sub make_link {
my ($linkpc,$lpc,$to,$from,$condition) = @_;
# Compute fully qualified ids for the link, the
# and from/to by prepending lpc.
#
my $linkid=$lpc.'.'.$linkpc;
my $goesto=$lpc.'.'.$to;
my $comesfrom=$lpc.'.'.$from;
my $undercond=0;
# If there is a condition, qualify it with the level counter.
if ($condition) {
$undercond=$lpc.'.'.$condition;
}
# Links are represnted by:
# goesto_.fuullyqualifedlinkid => fully qualified to
# comesfrom.fullyqualifiedlinkid => fully qualified from
# undercond_.fullyqualifiedlinkid => fully qualified condition id.
$hash{'goesto_'.$linkid}=$goesto;
$hash{'comesfrom_'.$linkid}=$comesfrom;
$hash{'undercond_'.$linkid}=$undercond;
# In addition:
# to_.fully qualified from => comma separated list of
# link ids with that from.
# Similarly:
# from_.fully qualified to => comma separated list of link ids`
# with that to.
# That allows us given a resource id to know all edges that go to it
# and leave from it.
#
if (defined($hash{'to_'.$comesfrom})) {
$hash{'to_'.$comesfrom}.=','.$linkid;
} else {
$hash{'to_'.$comesfrom}=''.$linkid;
}
if (defined($hash{'from_'.$goesto})) {
$hash{'from_'.$goesto}.=','.$linkid;
} else {
$hash{'from_'.$goesto}=''.$linkid;
}
}
# ------------------------------------------------------------------- Condition
#
# Processes <condition> tags, storing sufficient information about them
# in the hash so that they can be evaluated and used to conditionalize
# what is presented to the student.
#
# these can have the following attributes
#
# id = A unique identifier of the condition within the map.
#
# value = Is a perl script-let that, when evaluated in safe space
# determines whether or not the condition is true.
# Normally this takes the form of a test on an Apache::lonnet::EXT call
# to find the value of variable associated with a resource in the
# map identified by a mapalias.
# Here's a fragment of XML code that illustrates this:
#
# <param to="5" value="mainproblem" name="parameter_0_mapalias" type="string" />
# <resource src="" id="1" type="start" title="Start" />
# <resource src="/res/msu/albertel/b_and_c/p1.problem" id="5" title="p1.problem" />
# <condition value="&EXT('user.resource.resource.0.tries','mainproblem')
# <2 " id="61" type="stop" />
# <link to="5" index="1" from="1" condition="61" />
#
# In this fragment:
# - The param tag establishes an alias to resource id 5 of 'mainproblem'.
# - The resource that is the start of the map is identified.
# - The resource tag identifies the resource associated with this tag
# and gives it the id 5.
# - The condition is true if the tries variable associated with mainproblem
# is less than 2 (that is the user has had more than 2 tries).
# The condition type is a stop condition which inhibits(?) the associated
# link if the condition is false.
# - The link to resource 5 from resource 1 is affected by this condition.
#
# type = Type of the condition. The type determines how the condition affects the
# link associated with it and is one of
# - 'force'
# - 'stop'
# anything else including not supplied..which treated as:
# - 'normal'.
# Presumably maps get created by the resource assembly tool and therefore
# illegal type values won't squirm their way into the XML.
#
# Side effects:
# - The kind_level-qualified-condition-id hash element is set to 'cond'.
# - The condition text is pushed into the cond array and its element number is
# set in the condid_level-qualified-condition-id element of the hash.
# - The condition type is colon appneded to the cond array element for this condition.
sub parse_condition {
my ($token,$lpc) = @_;
my $rid=$lpc.'.'.$token->[2]->{'id'};
$hash{'kind_'.$rid}='cond';
my $condition = $token->[2]->{'value'};
$condition =~ s/[\n\r]+/ /gs;
push(@cond, $condition);
$hash{'condid_'.$rid}=$#cond;
if ($token->[2]->{'type'}) {
$cond[$#cond].=':'.$token->[2]->{'type'};
} else {
$cond[$#cond].=':normal';
}
}
# ------------------------------------------------------------------- Parameter
# Parse a <parameter> tag in the map.
# Parmameters:
# $token Token array for a start tag from HTML::TokeParser
# [0] = 'S'
# [1] = tagname ("param")
# [2] = Hash of {attribute} = values.
# [3] = Array of the keys in [2].
# [4] = unused.
# $lpc Current map nesting level.a
#
# Typical attributes:
# to=n - Number of the resource the parameter applies to.
# type=xx - Type of parameter value (e.g. string_yesno or int_pos).
# name=xxx - Name of parameter (e.g. parameter_randompick or parameter_randomorder).
# value=xxx - value of the parameter.
sub parse_param {
my ($token,$lpc) = @_;
my $referid=$lpc.'.'.$token->[2]->{'to'}; # Resource param applies to.
my $name=$token->[2]->{'name'}; # Name of parameter
my $part;
if ($name=~/^parameter_(.*)_/) {
$part=$1;
} else {
$part=0;
}
# Peel the parameter_ off the parameter name.
$name=~s/^.*_([^_]*)$/$1/;
# The value is:
# type.part.name.value
my $newparam=
&escape($token->[2]->{'type'}).':'.
&escape($part.'.'.$name).'='.
&escape($token->[2]->{'value'});
# The hash key is param_resourceid.
# Multiple parameters for a single resource are & separated in the hash.
if (defined($hash{'param_'.$referid})) {
$hash{'param_'.$referid}.='&'.$newparam;
} else {
$hash{'param_'.$referid}=''.$newparam;
}
#
# These parameters have to do with randomly selecting
# resources, therefore a separate hash is also created to
# make it easy to locate them when actually computing the resource set later on
# See the code conditionalized by ($randomize) in loadmap().
if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) { # Random selection turned on
$randompick{$referid}=$token->[2]->{'value'};
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { # Randomseed provided.
$randompickseed{$referid}=$token->[2]->{'value'};
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) { # Random order turned on.
$randomorder{$referid}=$token->[2]->{'value'};
}
# These parameters have to do with how the URLs of resources are presented to
# course members(?). encrypturl presents encypted url's while
# hiddenresource hides the URL.
#
if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
if ($token->[2]->{'value'}=~/^yes$/i) {
$encurl{$referid}=1;
}
}
if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
if ($token->[2]->{'value'}=~/^yes$/i) {
$hiddenurl{$referid}=1;
}
}
}
#
# Parse mapalias parameters.
# these are tags of the form:
# <param to="nn"
# value="some-alias-for-resourceid-nn"
# name="parameter_0_mapalias"
# type="string" />
# A map alias is a textual name for a resource:
# - The to attribute identifies the resource (this gets level qualified below)
# - The value attributes provides the alias string.
# - name must be of the regexp form: /^parameter_(0_)*mapalias$/
# - e.g. the string 'parameter_' followed by 0 or more "0_" strings
# terminating with the string 'mapalias'.
# Examples:
# 'parameter_mapalias', 'parameter_0_mapalias', parameter_0_0_mapalias'
# Invalid to ids are silently ignored.
#
# Parameters:
# token - The token array fromthe HMTML::TokeParser
# lpc - The current map level counter.
#
sub parse_mapalias_param {
my ($token,$lpc) = @_;
# Fully qualify the to value and ignore the alias if there is no
# corresponding resource.
my $referid=$lpc.'.'.$token->[2]->{'to'};
return if (!exists($hash{'src_'.$referid}));
# If this is a valid mapalias parameter,
# Append the target id to the count_mapalias element for that
# alias so that we can detect doubly defined aliases
# e.g.:
# <param to="1" value="george" name="parameter_0_mapalias" type="string" />
# <param to="2" value="george" name="parameter_0_mapalias" type="string" />
#
# The example above is trivial but the case that's important has to do with
# constructing a map that includes a nested map where the nested map may have
# aliases that conflict with aliases established in the enclosing map.
#
# ...and create/update the hash mapalias entry to actually store the alias.
#
if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
&count_mapalias($token->[2]->{'value'},$referid);
$hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
}
}
# --------------------------------------------------------- Simplify expression
#
# Someone should really comment this to describe what it does to what and why.
#
sub simplify {
my $expression=shift;
# (0&1) = 1
$expression=~s/\(0\&([_\.\d]+)\)/$1/g;
# (8)=8
$expression=~s/\(([_\.\d]+)\)/$1/g;
# 8&8=8
$expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
# 8|8=8
$expression=~s/([^_\.\d])([_\.\d]+)(?:\|\2)+([^_\.\d])/$1$2$3/g;
# (5&3)&4=5&3&4
$expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
# (((5&3)|(4&6)))=((5&3)|(4&6))
$expression=~
s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
# ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
$expression=~
s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
return $expression;
}
# -------------------------------------------------------- Build condition hash
#
# Traces a route recursively through the map after it has been loaded
# (I believe this really visits each resourcde that is reachable fromt he
# start top node.
#
# - Marks hidden resources as hidden.
# - Marks which resource URL's must be encrypted.
# - Figures out (if necessary) the first resource in the map.
# - Further builds the chunks of the big hash that define how
# conditions work
#
# Note that the tracing strategy won't visit resources that are not linked to
# anything or islands in the map (groups of resources that form a path but are not
# linked in to the path that can be traced from the start resource...but that's ok
# because by definition, those resources are not reachable by users of the course.
#
# Parameters:
# sofar - _URI of the prior entry or 0 if this is the top.
# rid - URI of the resource to visit.
# beenhere - list of resources (each resource enclosed by &'s) that have
# already been visited.
# encflag - If true the resource that resulted in a recursive call to us
# has an encoded URL (which means contained resources should too).
# hdnflag - If true,the resource that resulted in a recursive call to us
# was hidden (which means contained resources should be hidden too).
# Returns
# new value indicating how far the map has been traversed (the sofar).
#
sub traceroute {
my ($sofar,$rid,$beenhere,$encflag,$hdnflag,$cid)=@_;
my $newsofar=$sofar=simplify($sofar);
unless ($beenhere=~/\&\Q$rid\E\&/) {
$beenhere.=$rid.'&';
my ($mapid,$resid)=split(/\./,$rid);
my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
if ($hdnflag || lc($hidden) eq 'yes') {
$hiddenurl{$rid}=1;
}
if (!$hdnflag && lc($hidden) eq 'no') {
delete($hiddenurl{$rid});
}
my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
if (($retfrid eq '') && ($hash{'src_'.$rid})
&& ($hash{'src_'.$rid}!~/\.sequence$/)) {
$retfrid=$rid;
}
my (@deeplink,@recurseup);
if ($hash{'is_map_'.$rid}) {
my ($cdom,$cnum) = split(/_/,$cid);
my $mapsrc = $hash{'src_'.$rid};
my $map_pc = $hash{'map_pc_'.$mapsrc};
my @pcs = split(/,/,$hash{'map_hierarchy_'.$map_pc});
shift(@pcs);
@recurseup = map { &Apache::lonnet::declutter($hash{'map_id_'.$_}) } reverse(@pcs);
my $mapname = &Apache::lonnet::declutter(&Apache::lonnet::deversion($mapsrc));
my $deeplinkval = &get_mapparam($env{'user.name'},$env{'user.domain'},$cnum,$cdom,
$rid,$mapname,'0.deeplink',\@recurseup);
if ($deeplinkval ne '') {
@deeplink = ($deeplinkval,'map');
}
} else {
my @pcs = split(/,/,$hash{'map_hierarchy_'.$mapid});
shift(@pcs);
@recurseup = map { &Apache::lonnet::declutter($hash{'map_id_'.$_}) } reverse(@pcs);
@deeplink = &Apache::lonnet::EXT('resource.0.deeplink',$symb,'','','','',$cid,\@recurseup);
}
unless (@deeplink < 2) {
$hash{'deeplinkonly_'.$rid}=join(':',map { &escape($_); } @deeplink);
}
if (defined($hash{'conditions_'.$rid})) {
$hash{'conditions_'.$rid}=simplify(
'('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
} else {
$hash{'conditions_'.$rid}=$sofar;
}
# if the expression is just the 0th condition keep it
# otherwise leave a pointer to this condition expression
$newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
# Recurse if the resource is a map:
if (defined($hash{'is_map_'.$rid})) {
if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
$sofar=$newsofar=
&traceroute($sofar,
$hash{'map_start_'.$hash{'src_'.$rid}},
$beenhere,
$encflag || $encurl{$rid},
$hdnflag || $hiddenurl{$rid},
$cid);
}
}
# Processes links to this resource:
# - verify the existence of any conditionals on the link to here.
# - Recurse to any resources linked to us.
#
if (defined($hash{'to_'.$rid})) {
foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
my $further=$sofar;
#
# If there's a condition associated with this link be sure
# it's been defined else that's an error:
#
if ($hash{'undercond_'.$id}) {
if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
$further=simplify('('.'_'.$rid.')&('.
$hash{'condid_'.$hash{'undercond_'.$id}}.')');
} else {
$errtext.= '<br />'.
&mt('Undefined condition ID: [_1]',
$hash{'undercond_'.$id});
}
}
# Recurse to resoruces that have to's to us.
$newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
$encflag,$hdnflag,$cid);
}
}
}
return $newsofar;
}
# ------------------------------ Cascading conditions, quick access, parameters
#
# Seems a rather strangely named sub given what the comment above says it does.
sub accinit {
my ($uri,$short,$fn)=@_;
my %acchash=();
my %captured=();
my $condcounter=0;
$acchash{'acc.cond.'.$short.'.0'}=0;
# This loop is only interested in conditions and
# parameters in the big hash:
foreach my $key (keys(%hash)) {
# conditions:
if ($key=~/^conditions/) {
my $expr=$hash{$key};
# try to find and factor out common sub-expressions
# Any subexpression that is found is simplified, removed from
# the original condition expression and the simplified sub-expression
# substituted back in to the epxression..I'm not actually convinced this
# factors anything out...but instead maybe simplifies common factors(?)
foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
my $orig=$sub;
my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
next if (!defined($factor));
$sub=~s/\Q$factor\E//g;
$sub=~s/^\(/\($factor\(/;
$sub.=')';
$sub=simplify($sub);
$expr=~s/\Q$orig\E/$sub/;
}
$hash{$key}=$expr;
# If not yet seen, record in acchash and that we've seen it.
unless (defined($captured{$expr})) {
$condcounter++;
$captured{$expr}=$condcounter;
$acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
}
# Parameters:
} elsif ($key=~/^param_(\d+)\.(\d+)/) {
my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
$hash{'src_'.$1.'.'.$2});
foreach my $param (split(/\&/,$hash{$key})) {
my ($typename,$value)=split(/\=/,$param);
my ($type,$name)=split(/\:/,$typename);
$parmhash{$prefix.'.'.&unescape($name)}=
&unescape($value);
$parmhash{$prefix.'.'.&unescape($name).'.type'}=
&unescape($type);
}
}
}
# This loop only processes id entries in the big hash.
foreach my $key (keys(%hash)) {
if ($key=~/^ids/) {
foreach my $resid (split(/\,/,$hash{$key})) {
my $uri=$hash{'src_'.$resid};
my ($uripath,$urifile) =
&Apache::lonnet::split_uri_for_cond($uri);
if ($uripath) {
my $uricond='0';
if (defined($hash{'conditions_'.$resid})) {
$uricond=$captured{$hash{'conditions_'.$resid}};
}
if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
/(\&\Q$urifile\E\:[^\&]*)/) {
my $replace=$1;
my $regexp=$replace;
#$regexp=~s/\|/\\\|/g;
$acchash{'acc.res.'.$short.'.'.$uripath} =~
s/\Q$regexp\E/$replace\|$uricond/;
} else {
$acchash{'acc.res.'.$short.'.'.$uripath}.=
$urifile.':'.$uricond.'&';
}
} else {
$acchash{'acc.res.'.$short.'.'.$uripath}=
'&'.$urifile.':'.$uricond.'&';
}
}
}
}
}
$acchash{'acc.res.'.$short.'.'}='&:0&';
my $courseuri=$uri;
$courseuri=~s/^\/res\///;
my $regexp = 1;
&Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp);
&Apache::lonnet::appenv(\%acchash);
}
# ---------------- Selectively delete from randompick maps and hidden url parms
sub hiddenurls {
my $randomoutentry='';
foreach my $rid (keys(%randompick)) {
my $rndpick=$randompick{$rid};
my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
# ------------------------------------------- put existing resources into array
my @currentrids=();
foreach my $key (sort(keys(%hash))) {
if ($key=~/^src_($mpc\.\d+)/) {
if ($hash{'src_'.$1}) { push @currentrids, $1; }
}
}
# rids are number.number and we want to numercially sort on
# the second number
@currentrids=sort {
my (undef,$aid)=split(/\./,$a);
my (undef,$bid)=split(/\./,$b);
$aid <=> $bid;
} @currentrids;
next if ($#currentrids<$rndpick);
# -------------------------------- randomly eliminate the ones that should stay
my (undef,$id)=split(/\./,$rid);
if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
my $setcode;
if (defined($randomizationcode{$rid})) {
if ($env{'form.CODE'} eq '') {
$env{'form.CODE'} = $randomizationcode{$rid};
$setcode = 1;
}
}
my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
if ($setcode) {
undef($env{'form.CODE'});
undef($setcode);
}
&Apache::lonnet::setup_random_from_rndseed($rndseed);
my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
#&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
# -------------------------------------------------------- delete the leftovers
for (my $k=0; $k<=$#currentrids; $k++) {
if ($currentrids[$k]) {
$hash{'randomout_'.$currentrids[$k]}=1;
my ($mapid,$resid)=split(/\./,$currentrids[$k]);
if ($rescount{$mapid}) {
$rescount{$mapid} --;
}
if ($hash{'is_map_'.$currentrids[$k]}) {
if ($mapcount{$mapid}) {
$mapcount{$mapid} --;
}
}
$randomoutentry.='&'.
&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
$resid,
$hash{'src_'.$currentrids[$k]}
).'&';
}
}
}
# ------------------------------ take care of explicitly hidden urls or folders
foreach my $rid (keys(%hiddenurl)) {
$hash{'randomout_'.$rid}=1;
my ($mapid,$resid)=split(/\./,$rid);
if ($rescount{$mapid}) {
$rescount{$mapid} --;
}
if ($hash{'is_map_'.$rid}) {
if ($mapcount{$mapid}) {
$mapcount{$mapid} --;
}
}
$randomoutentry.='&'.
&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
$hash{'src_'.$rid}).'&';
}
# --------------------------------------- append randomout entry to environment
if ($randomoutentry) {
&Apache::lonnet::appenv({'acc.randomout' => $randomoutentry});
}
}
sub deeplinkouts {
my $deeplinkoutentry;
foreach my $rid (keys(%deeplinkout)) {
$hash{'deeplinkout_'.$rid}=1;
my ($mapid,$resid)=split(/\./,$rid);
$deeplinkoutentry.='&'.
&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
$hash{'src_'.$rid}).'&';
}
# --------------------------------------- append deeplinkout entry to environment
if ($deeplinkoutentry) {
&Apache::lonnet::appenv({'acc.deeplinkout' => $deeplinkoutentry});
}
}
# -------------------------------------- populate big hash with map breadcrumbs
# Create map_breadcrumbs_$pc from map_hierarchy_$pc by omitting intermediate
# maps not shown in Course Contents table.
sub mapcrumbs {
my ($cid) = @_;
foreach my $key (keys(%rescount)) {
if ($hash{'map_hierarchy_'.$key}) {
my $skipnext = 0;
foreach my $id (split(/,/,$hash{'map_hierarchy_'.$key}),$key) {
my $rid = $hash{'ids_'.$hash{'map_id_'.$id}};
unless (($skipnext) || (!&is_advanced($cid) && $hash{'deeplinkout_'.$rid})) {
$hash{'map_breadcrumbs_'.$key} .= "$id,";
}
unless (($id == 0) || ($id == 1)) {
if ((!$rescount{$id}) || ($rescount{$id} == 1 && $mapcount{$id} == 1)) {
$skipnext = 1;
} else {
$skipnext = 0;
}
}
}
$hash{'map_breadcrumbs_'.$key} =~ s/,$//;
}
}
}
# ---------------------------------------------------- Read map and all submaps
sub readmap {
my ($short,$critmsg_check) = @_;
$short=~s/^\///;
# TODO: Hidden dependency on current user:
my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
my $fn=$cenv{'fn'};
my $uri;
$short=~s/\//\_/g;
unless ($uri=$cenv{'url'}) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
"Could not load course $short.</font>");
return ('',&mt('No course data available.'));;
}
@cond=('true:normal');
unless (open(LOCKFILE,">","$fn.db.lock")) {
#
# Most likely a permissions problem on the lockfile or its directory.
#
$retfurl = '';
return ($retfurl,'<br />'.&mt('Map not loaded - Lock file could not be opened when reading map:').' <tt>'.$fn.'</tt>.');
}
my $lock=0;
my $gotstate=0;
# If we can get the lock without delay any files there are idle
# and from some prior request. We'll kill them off and regenerate them:
if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
$lock=1; # Remember that we hold the lock.
&unlink_tmpfiles($fn);
}
undef %randompick;
undef %randompickseed;
undef %randomorder;
undef %randomizationcode;
undef %hiddenurl;
undef %encurl;
undef %deeplinkout;
undef %rescount;
undef %mapcount;
$retfrid='';
$errtext='';
my ($untiedhash,$untiedparmhash,$tiedhash,$tiedparmhash); # More state flags.
# if we got the lock, regenerate course regnerate empty files and tie them.
if ($lock) {
if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
$tiedhash = 1;
if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
$tiedparmhash = 1;
$gotstate = &build_tmp_hashes($uri,
$fn,
$short,
\%cenv); # TODO: Need to provide requested user@dom
unless ($gotstate) {
&Apache::lonnet::logthis('Failed to write statemap at first attempt '.$fn.' for '.$uri.'.</font>');
}
$untiedparmhash = untie(%parmhash);
unless ($untiedparmhash) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
}
}
$untiedhash = untie(%hash);
unless ($untiedhash) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
}
}
flock(LOCKFILE,LOCK_UN); # RF: this is what I don't get unless there are other
# unlocked places the remainder happens..seems like if we
# just kept the lock here the rest of the code would have
# been much easier?
}
unless ($lock && $tiedhash && $tiedparmhash) {
# if we are here it is likely because we are already trying to
# initialize the course in another child, busy wait trying to
# tie the hashes for the next 90 seconds, if we succeed forward
# them on to navmaps, if we fail, throw up the Could not init
# course screen
#
# RF: I'm not seeing the case where the ties/unties can fail in a way
# that can be remedied by this. Since we owned the lock seems
# Tie/untie failures are a result of something like a permissions problem instead?
#
# In any vent, undo what we did manage to do above first:
if ($lock) {
# Got the lock but not the DB files
flock(LOCKFILE,LOCK_UN);
$lock = 0;
}
if ($tiedhash) {
unless($untiedhash) {
untie(%hash);
}
}
if ($tiedparmhash) {
unless($untiedparmhash) {
untie(%parmhash);
}
}
# Log our failure:
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
"Could not tie coursemap $fn for $uri.</font>");
$tiedhash = '';
$tiedparmhash = '';
my $i=0;
# Keep on retrying the lock for 90 sec until we succeed.
while($i<90) {
$i++;
sleep(1);
if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
# Got the lock, tie the hashes...the assumption in this code is
# that some other worker thread has created the db files quite recently
# so no load is needed:
$lock = 1;
if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
$tiedhash = 1;
if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
$tiedparmhash = 1;
if (-e "$fn.state") {
$retfurl='/adm/navmaps';
# BUG BUG: Side effect!
# Should conditionalize on something so that we can use this
# to load maps for courses that are not current?
#
&Apache::lonnet::appenv({"request.course.id" => $short,
"request.course.fn" => $fn,
"request.course.uri" => $uri,
"request.course.tied" => time});
$untiedhash = untie(%hash);
$untiedparmhash = untie(%parmhash);
$gotstate = 1;
last;
}
$untiedparmhash = untie(%parmhash);
}
$untiedhash = untie(%hash);
}
}
}
if ($lock) {
flock(LOCKFILE,LOCK_UN);
$lock = 0;
if ($tiedparmhash) {
unless ($untiedparmhash) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
}
}
if ($tiedparmhash) {
unless ($untiedhash) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
}
}
}
}
# I think this branch of code is all about what happens if we just did the stuff above,
# but found that the state file did not exist...again if we'd just held the lock
# would that have made this logic simpler..as generating all the files would be
# an atomic operation with respect to the lock.
#
unless ($gotstate) {
$lock = 0;
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not read statemap '.$fn.' for '.$uri.'.</font>');
&unlink_tmpfiles($fn);
if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
$lock=1;
}
undef %randompick;
undef %randompickseed;
undef %randomorder;
undef %randomizationcode;
undef %hiddenurl;
undef %encurl;
undef %deeplinkout;
undef %rescount;
undef %mapcount;
$errtext='';
$retfrid='';
#
# Once more through the routine of tying and loading and so on.
#
if ($lock) {
if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
$gotstate = &build_tmp_hashes($uri,$fn,$short,\%cenv); # TODO: User dependent?
unless ($gotstate) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Failed to write statemap at second attempt '.$fn.' for '.$uri.'.</font>');
}
unless (untie(%parmhash)) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not untie coursemap parmhash '.$fn.'.db for '.$uri.'.</font>');
}
} else {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not tie coursemap '.$fn.'__parms.db for '.$uri.'.</font>');
}
unless (untie(%hash)) {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not untie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
}
} else {
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not tie coursemap '.$fn.'.db for '.$uri.'.</font>');
}
flock(LOCKFILE,LOCK_UN);
$lock = 0;
} else {
# Failed to get the immediate lock.
&Apache::lonnet::logthis('<font color="blue">WARNING: '.
'Could not obtain lock to tie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
}
}
close(LOCKFILE);
unless (($errtext eq '') || ($env{'request.course.uri'} =~ m{^/uploaded/})) {
&Apache::lonmsg::author_res_msg($env{'request.course.uri'},
$errtext); # TODO: User dependent?
}
# ------------------------------------------------- Check for critical messages
# Depends on user must parameterize this as well..or separate as this is:
# more part of determining what someone sees on entering a course?
# When lonuserstate::readmap() is called from lonroles.pm, i.e.,
# after selecting a role in a course, critical_redirect will be called,
# unless the course has a blocking event in effect, which suppresses
# critical message checking (users without evb priv).
#
if ($critmsg_check) {
my ($redirect,$url) = &Apache::loncommon::critical_redirect();
if ($redirect) {
$retfurl = $url;
}
}
return ($retfurl,$errtext);
}
#
# This sub is called when the course hash and the param hash have been tied and
# their lock file is held.
# Parameters:
# $uri - URI that identifies the course.
# $fn - The base path/filename of the files that make up the context
# being built.
# $short - Short course name.
# $cenvref - Reference to the course environment hash returned by
# Apache::lonnet::coursedescription
#
# Assumptions:
# The globals
# %hash, %paramhash are tied to their gdbm files and we hold the lock on them.
#
sub build_tmp_hashes {
my ($uri,$fn,$short,$cenvref) = @_;
unless(ref($cenvref) eq 'HASH') {
return;
}
my %cenv = %{$cenvref};
my $gotstate = 0;
%hash=(); # empty the global course and parameter hashes.
%parmhash=();
$errtext=''; # No error messages yet.
$pc=0;
&clear_mapalias_count();
&processversionfile(%cenv);
# URI Of the map file.
my $furi=&Apache::lonnet::clutter($uri);
#
# the map staring points.
#
$hash{'src_0.0'}=&versiontrack($furi);
$hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
$hash{'ids_'.$furi}='0.0';
$hash{'is_map_0.0'}=1;
# Load the map.. note that loadmap may implicitly recurse if the map contains
# sub-maps.
&loadmap($uri,'0.0',$short);
# The code below only executes if there is a starting point for the map>
# Q/BUG??? If there is no start resource for the map should that be an error?
#
if (defined($hash{'map_start_'.$uri})) {
&Apache::lonnet::appenv({"request.course.id" => $short,
"request.course.fn" => $fn,
"request.course.uri" => $uri,
"request.course.tied" => time});
$env{'request.course.id'}=$short;
&traceroute('0',$hash{'map_start_'.$uri},'&','','',$short);
&accinit($uri,$short,$fn);
&hiddenurls();
}
$errtext .= &get_mapalias_errors();
# ------------------------------------------------------- Put versions into src
foreach my $key (keys(%hash)) {
if ($key=~/^src_/) {
$hash{$key}=&putinversion($hash{$key});
} elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
my ($type, $url) = ($1,$2);
my $value = $hash{$key};
$hash{$type.&putinversion($url)}=$value;
}
}
# ---------------------------------------------------------------- Encrypt URLs
foreach my $id (keys(%encurl)) {
# $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
$hash{'encrypted_'.$id}=1;
}
# ----------------------------------------------- Close hashes to finally store
# --------------------------------- Routine must pass this point, no early outs
$hash{'first_rid'}=$retfrid;
my ($mapid,$resid)=split(/\./,$retfrid);
$hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
$retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
if ($hash{'encrypted_'.$retfrid}) {
$retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
}
$hash{'first_url'}=$retfurl;
# ---------------------------------------------------- Store away initial state
{
my $cfh;
if (open($cfh,">","$fn.state")) {
print $cfh join("\n",@cond);
$gotstate = 1;
} else {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not write statemap $fn for $uri.</font>");
}
}
# Was initial access via a deep-link?
my ($cdom,$cnum) = split(/_/,$short);
if (($cdom ne '') && ($env{'request.deeplink.login'} ne '')) {
my $deeplink_symb = &Apache::loncommon::deeplink_login_symb($cnum,$cdom);
if ($deeplink_symb) {
my ($loginrid,$deeplink_login_pc,$login_hierarchy);
my ($map,$resid,$url) = &Apache::lonnet::decode_symb($deeplink_symb);
$loginrid = $hash{'map_pc_'.&Apache::lonnet::clutter($map)}.'.'.$resid;
if ($deeplink_symb =~ /\.(page|sequence)$/) {
$deeplink_login_pc = $hash{'map_pc_'.&Apache::lonnet::clutter($url)};
} else {
$deeplink_login_pc = $hash{'map_pc_'.&Apache::lonnet::clutter($map)};
}
my $deeplink;
if ($hash{'deeplinkonly_'.$loginrid} ne '') {
my @deeplinkinfo = map { &unescape($_); } split(/:/,$hash{'deeplinkonly_'.$loginrid});
unless (@deeplinkinfo < 2) {
$deeplink = $deeplinkinfo[0];
}
}
if ($deeplink) {
my $disallow;
my ($state,$others,$listed,$scope,$protect) = split(/,/,$deeplink);
if (($protect ne 'none') && ($protect ne '')) {
my ($acctype,$item) = split(/:/,$protect);
if ($acctype =~ /lti(c|d)$/) {
unless ($env{'request.linkprot'} eq $item.$1.':'.$env{'request.deeplink.login'}) {
$disallow = 1;
}
} elsif ($acctype eq 'key') {
unless ($env{'request.linkkey'} eq $item) {
$disallow = 1;
}
}
}
if ($disallow) {
&Apache::lonnet::delenv('request.deeplink.login');
if ($env{'request.deeplink.target'} ne '') {
&Apache::lonnet::delenv('request.deeplink.target');
}
} else {
if ($others eq 'hide') {
my @recfolders;
if ($scope eq 'rec') {
foreach my $key (keys(%hash)) {
if ($key=~/^map_hierarchy_(\d+)$/) {
my $mpc = $1;
my @ids = split(/,/,$hash{$key});
if (grep(/^$deeplink_login_pc$/,@ids)) {
my $idx;
foreach my $mapid (@ids) {
if ($idx) {
push(@recfolders,$mapid);
} elsif ($mapid == $deeplink_login_pc) {
push(@recfolders,$mapid);
$idx = $mapid;
}
}
push(@recfolders,$mpc);
}
}
}
}
foreach my $key (keys(%hash)) {
if ($key=~/^src_(.+)$/) {
my $rid = $1;
next if ($rid eq '0.0');
next if ($rid eq $loginrid);
if ($scope ne 'res') {
my $mapid = (split(/\./,$rid))[0];
next if ($mapid eq $deeplink_login_pc);
if ($scope eq 'rec') {
next if (grep(/^$mapid$/,@recfolders));
}
}
$deeplinkout{$rid} = 1;
}
}
}
}
&deeplinkouts();
}
}
}
&mapcrumbs();
return $gotstate;
}
sub unlink_tmpfiles {
my ($fn) = @_;
my $file_dir = dirname($fn);
if ("$file_dir/" eq LONCAPA::tempdir()) {
my @files = qw (.db _symb.db .state _parms.db);
foreach my $file (@files) {
if (-e $fn.$file) {
unless (unlink($fn.$file)) {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not unlink ".$fn.$file."</font>");
}
}
}
}
return;
}
# ------------------------------------------------------- Evaluate state string
sub evalstate {
my $fn=$env{'request.course.fn'}.'.state';
my $state='';
if (-e $fn) {
my @conditions=();
{
open(my $fh,"<",$fn);
@conditions=<$fh>;
close($fh);
}
my $safeeval = new Safe;
my $safehole = new Safe::Hole;
$safeeval->permit("entereval");
$safeeval->permit(":base_math");
$safeeval->deny(":base_io");
$safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
foreach my $line (@conditions) {
chomp($line);
my ($condition,$weight)=split(/\:/,$line);
if ($safeeval->reval($condition)) {
if ($weight eq 'force') {
$state.='3';
} else {
$state.='2';
}
} else {
if ($weight eq 'stop') {
$state.='0';
} else {
$state.='1';
}
}
}
}
&Apache::lonnet::appenv({'user.state.'.$env{'request.course.id'} => $state});
return $state;
}
sub get_mapparam {
my ($uname,$udom,$cnum,$cdom,$rid,$mapname,$what,$recurseupref) = @_;
unless ($mapname) { return; }
# ------------------------------------------------- Get coursedata (if present)
my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
if (!ref($courseopt)) {
undef($courseopt);
}
# --------------------------------------------------- Get userdata (if present)
my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
if (!ref($useropt)) {
undef($useropt);
}
my @recurseup;
if (ref($recurseupref) eq 'ARRAY') {
@recurseup = @{$recurseupref};
}
# Get the section if there is one.
my $cid = $cdom.'_'.$cnum;
my $csec=$env{'request.course.sec'};
my $cgroup='';
my @cgrps=split(/:/,$env{'request.course.groups'});
if (@cgrps > 0) {
@cgrps = sort(@cgrps);
$cgroup = $cgrps[0];
}
my $rwhat=$what;
$what=~s/^parameter\_//;
$what=~s/\_/\./;
# Build the hash keys for the lookup:
my $mapparm=$mapname.'___(all).'.$what;
my $recurseparm=$mapname.'___(rec).'.$what;
my $usercourseprefix=$cid;
my $grplevelm = "$usercourseprefix.[$cgroup].$mapparm";
my $seclevelm = "$usercourseprefix.[$csec].$mapparm";
my $courselevelm = "$usercourseprefix.$mapparm";
my $grpleveli = "$usercourseprefix.[$cgroup].$recurseparm";
my $secleveli = "$usercourseprefix.[$csec].$recurseparm";
my $courseleveli = "$usercourseprefix.$recurseparm";
# Check per user
if ($uname and defined($useropt)) {
if (defined($$useropt{$courselevelm})) {
return $$useropt{$courselevelm};
}
if (defined($$useropt{$courseleveli})) {
return $$useropt{$courseleveli};
}
foreach my $item (@recurseup) {
my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
if (defined($$useropt{$norecursechk})) {
if ($what =~ /\.(encrypturl|hiddenresource)$/) {
return $$useropt{$norecursechk};
} else {
last;
}
}
my $recursechk=$usercourseprefix.'.'.$item.'___(rec).'.$what;
if (defined($$useropt{$recursechk})) {
return $$useropt{$recursechk};
}
}
}
# Check course -- group
if ($cgroup ne '' and defined ($courseopt)) {
if (defined($$courseopt{$grplevelm})) {
return $$courseopt{$grplevelm};
}
if (defined($$courseopt{$grpleveli})) {
return $$courseopt{$grpleveli};
}
foreach my $item (@recurseup) {
my $norecursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(all).'.$what;
if (defined($$courseopt{$norecursechk})) {
if ($what =~ /\.(encrypturl|hiddenresource)$/) {
return $$courseopt{$norecursechk};
} else {
last;
}
}
my $recursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(rec).'.$what;
if (defined($$courseopt{$recursechk})) {
return $$courseopt{$recursechk};
}
}
}
# Check course -- section
if ($csec ne '' and defined($courseopt)) {
if (defined($$courseopt{$seclevelm})) {
return $$courseopt{$seclevelm};
}
if (defined($$courseopt{$secleveli})) {
return $$courseopt{$secleveli};
}
foreach my $item (@recurseup) {
my $norecursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(all).'.$what;
if (defined($$courseopt{$norecursechk})) {
if ($what =~ /\.(encrypturl|hiddenresource)$/) {
return $$courseopt{$norecursechk};
} else {
last;
}
}
my $recursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(rec).'.$what;
if (defined($$courseopt{$recursechk})) {
return $$courseopt{$recursechk};
}
}
}
# Check the map parameters themselves:
if ($hash{'param_'.$rid}) {
my @items = split(/\&/,$hash{'param_'.$rid});
my $thisparm;
foreach my $item (@items) {
my ($esctype,$escname,$escvalue) = ($item =~ /^([^:]+):([^=]+)=(.*)$/);
my $name = &unescape($escname);
my $value = &unescape($escvalue);
if ($name eq $what) {
$thisparm = $value;
last;
}
}
if (defined($thisparm)) {
return $thisparm;
}
}
# Additional course parameters:
if (defined($courseopt)) {
if (defined($$courseopt{$courselevelm})) {
return $$courseopt{$courselevelm};
}
if (defined($$courseopt{$courseleveli})) {
return $$courseopt{$courseleveli};
}
if (@recurseup) {
foreach my $item (@recurseup) {
my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
if (defined($$courseopt{$norecursechk})) {
if ($what =~ /\.(encrypturl|hiddenresource)$/) {
return $$courseopt{$norecursechk};
} else {
last;
}
}
my $recursechk=$usercourseprefix.'.'.$item.'___(rec).'.$what;
if (defined($$courseopt{$recursechk})) {
return $$courseopt{$recursechk};
}
}
}
}
return undef;
}
# This block seems to have code to manage/detect doubly defined
# aliases in maps.
{
my %mapalias_cache;
sub count_mapalias {
my ($value,$resid) = @_;
push(@{ $mapalias_cache{$value} }, $resid);
}
sub get_mapalias_errors {
my $error_text;
foreach my $mapalias (sort(keys(%mapalias_cache))) {
next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
my $count;
my $which =
join('</li><li>',
map {
my $id = $_;
if (exists($hash{'src_'.$id})) {
$count++;
}
my ($mapid) = split(/\./,$id);
&mt('Resource [_1][_2]in Map [_3]',
$hash{'title_'.$id},'<br />',
$hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
} (@{ $mapalias_cache{$mapalias} }));
next if ($count < 2);
$error_text .= '<div class="LC_error">'.
&mt('Error: Found the mapalias "[_1]" defined multiple times.',
$mapalias).
'</div><ul><li>'.$which.'</li></ul>';
}
&clear_mapalias_count();
return $error_text;
}
sub clear_mapalias_count {
undef(%mapalias_cache);
}
}
1;
__END__
=head1 NAME
Apache::lonuserstate - Construct and maintain state and binary representation
of course for user
=head1 SYNOPSIS
Invoked by lonroles.pm.
&Apache::lonuserstate::readmap($cdom.'/'.$cnum);
=head1 INTRODUCTION
This module constructs and maintains state and binary representation
of course for user.
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 SUBROUTINES
=over
=item loadmap()
Loads map from disk
=item simplify()
Simplify expression
=item traceroute()
Build condition hash
=item accinit()
Cascading conditions, quick access, parameters
=item readmap()
Read map and all submaps
=item evalstate()
Evaluate state string
=back
=cut
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