version 1.3, 2000/08/06 03:25:24
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version 1.144, 2012/11/11 22:26:49
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# The LearningOnline Network with CAPA |
# The LearningOnline Network with CAPA |
# Construct and maintain state and binary representation of course for user |
# Construct and maintain state and binary representation of course for user |
# |
# |
# (Server for RAT Maps |
# $Id$ |
# |
# |
# (Edit Handler for RAT Maps |
# Copyright Michigan State University Board of Trustees |
# (TeX Content Handler |
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# |
# |
# 05/29/00,05/30 Gerd Kortemeyer) |
# This file is part of the LearningOnline Network with CAPA (LON-CAPA). |
# 7/1 Gerd Kortemeyer) |
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# 7/1,7/3,7/4,7/7,7/8,7/10 Gerd Kortemeyer) |
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# |
# |
# 7/15,7/17,7/18,8/1,8/2,8/4,8/5 Gerd Kortemeyer |
# LON-CAPA is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# LON-CAPA is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with LON-CAPA; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# /home/httpd/html/adm/gpl.txt |
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# |
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# http://www.lon-capa.org/ |
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# |
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### |
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package Apache::lonuserstate; |
package Apache::lonuserstate; |
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# ------------------------------------------------- modules used by this module |
use strict; |
use strict; |
use Apache::Constants qw(:common :http); |
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use Apache::File; |
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use HTML::TokeParser; |
use HTML::TokeParser; |
use Apache::lonnet(); |
use Apache::lonnet; |
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use Apache::lonlocal; |
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use Apache::loncommon(); |
use GDBM_File; |
use GDBM_File; |
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use Apache::lonmsg; |
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use Safe; |
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use Safe::Hole; |
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use Opcode; |
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use Apache::lonenc; |
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use Fcntl qw(:flock); |
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use LONCAPA; |
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use File::Basename; |
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# ---------------------------------------------------- Globals for this package |
# ---------------------------------------------------- Globals for this package |
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my $pc; # Package counter |
my $pc; # Package counter is this what 'Guts' calls the map counter? |
my %hash; # The big tied hash |
my %hash; # The big tied hash |
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my %parmhash;# The hash with the parameters |
my @cond; # Array with all of the conditions |
my @cond; # Array with all of the conditions |
my $errtext; # variable with all errors |
my $errtext; # variable with all errors |
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my $retfrid; # variable with the very first RID in the course |
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my $retfurl; # first URL |
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my %randompick; # randomly picked resources |
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my %randompickseed; # optional seed for randomly picking resources |
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my %randomorder; # maps to order contents randomly |
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my %encurl; # URLs in this folder are supposed to be encrypted |
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my %hiddenurl; # this URL (or complete folder) is supposed to be hidden |
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# ----------------------------------- Remove version from URL and store in hash |
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sub versionerror { |
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my ($uri,$usedversion,$unusedversion)=@_; |
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return '<br />'.&mt('Version discrepancy: resource [_1] included in both version [_2] and version [_3]. Using version [_2].', |
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$uri,$usedversion,$unusedversion).'<br />'; |
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} |
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# Removes the version number from a URI and returns the resulting |
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# URI (e.g. mumbly.version.stuff => mumbly.stuff). |
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# |
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# If the URI has not been seen with a versio before the |
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# hash{'version_'.resultingURI} is set to the version number. |
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# If the URI has been seen and the version does not match and error |
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# is added to the error string. |
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# |
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# Parameters: |
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# URI potentially with a version. |
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# Returns: |
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# URI with the version cut out. |
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# See above for side effects. |
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# |
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# --------------------------------------------------------- Loads map from disk |
sub versiontrack { |
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my $uri=shift; |
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if ($uri=~/\.(\d+)\.\w+$/) { |
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my $version=$1; |
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$uri=~s/\.\d+\.(\w+)$/\.$1/; |
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unless ($hash{'version_'.$uri}) { |
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$hash{'version_'.$uri}=$version; |
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} elsif ($version!=$hash{'version_'.$uri}) { |
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$errtext.=&versionerror($uri,$hash{'version_'.$uri},$version); |
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} |
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} |
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return $uri; |
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} |
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sub loadmap { |
# -------------------------------------------------------------- Put in version |
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sub putinversion { |
my $uri=shift; |
my $uri=shift; |
if ($hash{'map_pc_'.$uri}) { return OK; } |
my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri); |
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if ($hash{'version_'.$uri}) { |
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my $version=$hash{'version_'.$uri}; |
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if ($version eq 'mostrecent') { return $uri; } |
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if ($version eq &Apache::lonnet::getversion( |
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&Apache::lonnet::filelocation('',$uri))) |
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{ return $uri; } |
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$uri=~s/\.(\w+)$/\.$version\.$1/; |
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} |
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&Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600); |
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return $uri; |
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} |
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# ----------------------------------------- Processing versions file for course |
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sub processversionfile { |
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my %cenv=@_; |
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my %versions=&Apache::lonnet::dump('resourceversions', |
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$cenv{'domain'}, |
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$cenv{'num'}); |
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foreach my $ver (keys(%versions)) { |
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if ($ver=~/^error\:/) { return; } |
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$hash{'version_'.$ver}=$versions{$ver}; |
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} |
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} |
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# --------------------------------------------------------- Loads from disk |
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# |
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# Loads a map file. |
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# Note that this may implicitly recurse via parse_resource if one of the resources |
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# is itself composed. |
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# |
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# Parameters: |
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# uri - URI of the map file. |
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# parent_rid - Resource id in the map of the parent resource (0.0 for the top level map) |
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# |
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# |
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sub loadmap { |
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my ($uri,$parent_rid)=@_; |
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# Is the map already included? |
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if ($hash{'map_pc_'.$uri}) { |
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$errtext.='<p class="LC_error">'. |
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&mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>'). |
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'</p>'; |
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return; |
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} |
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# Register the resource in it's map_pc_ [for the URL] |
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# map_id.nnn is the nesting level -> to the URI. |
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$pc++; |
$pc++; |
my $lpc=$pc; |
my $lpc=$pc; |
$hash{'map_pc_'.$uri}=$lpc; |
$hash{'map_pc_'.$uri}=$lpc; |
$hash{'map_id_'.$lpc}=$uri; |
$hash{'map_id_'.$lpc}=$uri; |
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my $fn='/home/httpd/html'.$uri; |
# If the parent is of the form n.m hang this map underneath it in the |
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# map hierarchy. |
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if ($parent_rid =~ /^(\d+)\.\d+$/) { |
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my $parent_pc = $1; |
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if (defined($hash{'map_hierarchy_'.$parent_pc})) { |
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$hash{'map_hierarchy_'.$lpc}=$hash{'map_hierarchy_'.$parent_pc}.','. |
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$parent_pc; |
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} else { |
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$hash{'map_hierarchy_'.$lpc}=$parent_pc; |
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} |
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} |
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# Determine and check filename of the sequence we need to read: |
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my $fn=&Apache::lonnet::filelocation('',&putinversion($uri)); |
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my $ispage=($fn=~/\.page$/); |
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unless (($fn=~/\.course$/) || |
# We can only nest sequences or pages. Anything else is an illegal nest. |
($fn=~/\.sequence$/) || |
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($fn=~/\.page$/)) { |
unless (($fn=~/\.sequence$/) || $ispage) { |
$errtext.="Invalid map: $fn\n"; |
$errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn); |
return OK; |
return; |
} |
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unless (-e $fn) { |
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my $returned=Apache::lonnet::repcopy($fn); |
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unless ($returned eq OK) { |
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$errtext.="Could not import: $fn - "; |
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if ($returned eq HTTP_SERVICE_UNAVAILABLE) { |
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$errtext.="Server unavailable\n"; |
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} |
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if ($returned eq HTTP_NOT_FOUND) { |
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$errtext.="File not found\n"; |
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} |
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if ($returned eq FORBIDDEN) { |
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$errtext.="Access forbidden\n"; |
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} |
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return OK; |
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} |
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} |
} |
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if (-e $fn) { |
# Read the XML that constitutes the file. |
my @content; |
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{ |
my $instr=&Apache::lonnet::getfile($fn); |
my $fh=Apache::File->new($fn); |
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@content=<$fh>; |
if ($instr eq -1) { |
} |
$errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn); |
my $instr=join('',@content); |
return; |
my $parser = HTML::TokeParser->new(\$instr); |
} |
my $token; |
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# Successfully got file, parse it |
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# parse for parameter processing. |
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# Note that these are <param... / > tags |
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# so we only care about 'S' (tag start) nodes. |
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my $parser = HTML::TokeParser->new(\$instr); |
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$parser->attr_encoded(1); |
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# first get all parameters |
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while (my $token = $parser->get_token) { |
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next if ($token->[0] ne 'S'); |
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if ($token->[1] eq 'param') { |
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&parse_param($token,$lpc); |
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} |
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} |
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# Get set to take another pass through the XML: |
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# for resources and links. |
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$parser = HTML::TokeParser->new(\$instr); |
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$parser->attr_encoded(1); |
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my $linkpc=0; |
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$fn=~/\.(\w+)$/; |
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$hash{'map_type_'.$lpc}=$1; |
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my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i); |
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# Parse the resources, link and condition tags. |
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# Note that if randomorder or random select is chosen the links and |
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# conditions are meaningless but are determined by the randomization. |
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# This is handled in the next chunk of code. |
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my @map_ids; |
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while (my $token = $parser->get_token) { |
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next if ($token->[0] ne 'S'); |
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# Resource |
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if ($token->[1] eq 'resource') { |
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my $resource_id = &parse_resource($token,$lpc,$ispage,$uri); |
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if (defined $resource_id) { |
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push(@map_ids, $resource_id); |
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} |
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# Link |
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} elsif ($token->[1] eq 'link' && !$randomize) { |
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&make_link(++$linkpc,$lpc,$token->[2]->{'to'}, |
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$token->[2]->{'from'}, |
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$token->[2]->{'condition'}); # note ..condition may be undefined. |
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# condition |
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} elsif ($token->[1] eq 'condition' && !$randomize) { |
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&parse_condition($token,$lpc); |
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} |
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} |
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# Handle randomization and random selection |
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my $linkpc=0; |
if ($randomize) { |
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if (!$env{'request.role.adv'}) { |
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my $seed; |
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# In the advanced role, the map's random seed |
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# parameter is used as the basis for computing the |
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# seed ... if it has been specified: |
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if (defined($randompickseed{$parent_rid})) { |
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$seed = $randompickseed{$parent_rid}; |
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} else { |
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# Otherwise the parent's fully encoded symb is used. |
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my ($mapid,$resid)=split(/\./,$parent_rid); |
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my $symb= |
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&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, |
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$resid,$hash{'src_'.$parent_rid}); |
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$seed = $symb; |
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} |
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# TODO: Here for sure we need to pass along the username/domain |
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# so that we can impersonate users in lonprintout e.g. |
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my $rndseed=&Apache::lonnet::rndseed($seed); |
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&Apache::lonnet::setup_random_from_rndseed($rndseed); |
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# Take the set of map ids we have decoded and permute them to a |
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# random order based on the seed set above. All of this is |
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# processing the randomorder parameter if it is set, not |
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# randompick. |
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@map_ids=&Math::Random::random_permutation(@map_ids); |
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} |
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my $from = shift(@map_ids); |
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my $from_rid = $lpc.'.'.$from; |
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$hash{'map_start_'.$uri} = $from_rid; |
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$hash{'type_'.$from_rid}='start'; |
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# Create links to reflect the random re-ordering done above. |
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# In the code to process the map XML, we did not process links or conditions |
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# if randomorder was set. This means that for an instructor to choose |
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while (my $to = shift(@map_ids)) { |
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&make_link(++$linkpc,$lpc,$to,$from); |
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my $to_rid = $lpc.'.'.$to; |
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$hash{'type_'.$to_rid}='normal'; |
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$from = $to; |
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$from_rid = $to_rid; |
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} |
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$fn=~/\.(\w+)$/; |
$hash{'map_finish_'.$uri}= $from_rid; |
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$hash{'type_'.$from_rid}='finish'; |
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} |
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$parser = HTML::TokeParser->new(\$instr); |
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$parser->attr_encoded(1); |
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# last parse out the mapalias params. Thes provide mnemonic |
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# tags to resources that can be used in conditions |
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while (my $token = $parser->get_token) { |
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next if ($token->[0] ne 'S'); |
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if ($token->[1] eq 'param') { |
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&parse_mapalias_param($token,$lpc); |
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} |
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} |
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} |
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$hash{'map_type_'.$lpc}=$1; |
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while ($token = $parser->get_token) { |
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if ($token->[0] eq 'S') { |
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if ($token->[1] eq 'resource') { |
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# -------------------------------------------------------------------- Resource |
# -------------------------------------------------------------------- Resource |
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# |
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# Parses a resource tag to produce the value to push into the |
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# map_ids array. |
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# |
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# |
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# Information about the actual type of resource is provided by the file extension |
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# of the uri (e.g. .problem, .sequence etc. etc.). |
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# |
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# Parameters: |
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# $token - A token from HTML::TokeParser |
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# This is an array that describes the most recently parsed HTML item. |
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# $lpc - Map nesting level (?) |
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# $ispage - True if this resource is encapsulated in a .page (assembled resourcde). |
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# $uri - URI of the enclosing resource. |
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# Returns: |
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# Value of the id attribute of the tag. |
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# |
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# Note: |
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# The token is an array that contains the following elements: |
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# [0] => 'S' indicating this is a start token |
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# [1] => 'resource' indicating this tag is a <resource> tag. |
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# [2] => Hash of attribute =>value pairs. |
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# [3] => @(keys [2]). |
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# [4] => unused. |
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# |
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# The attributes of the resourcde tag include: |
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# |
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# id - The resource id. |
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# src - The URI of the resource. |
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# type - The resource type (e.g. start and finish). |
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# title - The resource title. |
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my $rid=$lpc.'.'.$token->[2]->{'id'}; |
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$hash{'kind_'.$rid}='res'; |
sub parse_resource { |
$hash{'title_'.$rid}=$token->[2]->{'title'}; |
my ($token,$lpc,$ispage,$uri) = @_; |
my $turi=$token->[2]->{'src'}; |
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$hash{'src_'.$rid}=$turi; |
# I refuse to countenance code like this that has |
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# such a dirty side effect (and forcing this sub to be called within a loop). |
if (defined($hash{'ids_'.$turi})) { |
# |
$hash{'ids_'.$turi}.=','.$rid; |
# if ($token->[2]->{'type'} eq 'zombie') { next; } |
} else { |
# |
$hash{'ids_'.$turi}=''.$rid; |
# The original code both returns _and_ skips to the next pass of the >caller's< |
} |
# loop, that's just dirty. |
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# |
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if ($token->[2]->{'src'}=~/\/\//) { |
# Zombie resources don't produce anything useful. |
$hash{'ext_'.$rid}='true:'; |
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} else { |
if ($token->[2]->{'type'} eq 'zombie') { |
$hash{'ext_'.$rid}='false:'; |
return undef; |
} |
} |
if ($token->[2]->{'type'}) { |
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$hash{'type_'.$rid}=$token->[2]->{'type'}; |
my $rid=$lpc.'.'.$token->[2]->{'id'}; # Resource id in hash is levelcounter.id-in-xml. |
if ($token->[2]->{'type'} eq 'start') { |
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$hash{'map_start_'.$uri}="$rid"; |
# Save the hash element type and title: |
} |
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if ($token->[2]->{'type'} eq 'finish') { |
$hash{'kind_'.$rid}='res'; |
$hash{'map_finish_'.$uri}="$rid"; |
$hash{'title_'.$rid}=$token->[2]->{'title'}; |
} |
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} else { |
# Get the version free URI for the resource. |
$hash{'type_'.$rid}='normal'; |
# If a 'version' attribute was supplied, and this resource's version |
} |
# information has not yet been stored, store it. |
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# |
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my $turi=&versiontrack($token->[2]->{'src'}); |
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if ($token->[2]->{'version'}) { |
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unless ($hash{'version_'.$turi}) { |
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$hash{'version_'.$turi}=$1; |
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} |
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} |
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# Pull out the title and do entity substitution on &colon |
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# Q: Why no other entity substitutions? |
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my $title=$token->[2]->{'title'}; |
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$title=~s/\&colon\;/\:/gs; |
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# I think the point of all this code is to construct a final |
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# URI that apache and its rewrite rules can use to |
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# fetch the resource. Thi s sonly necessary if the resource |
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# is not a page. If the resource is a page then it must be |
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# assembled (at fetch time?). |
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unless ($ispage) { |
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$turi=~/\.(\w+)$/; |
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my $embstyle=&Apache::loncommon::fileembstyle($1); |
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if ($token->[2]->{'external'} eq 'true') { # external |
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$turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//; |
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} elsif ($turi=~/^\/*uploaded\//) { # uploaded |
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if (($embstyle eq 'img') |
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|| ($embstyle eq 'emb') |
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|| ($embstyle eq 'wrp')) { |
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$turi='/adm/wrapper'.$turi; |
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} elsif ($embstyle eq 'ssi') { |
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#do nothing with these |
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} elsif ($turi!~/\.(sequence|page)$/) { |
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$turi='/adm/coursedocs/showdoc'.$turi; |
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} |
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} elsif ($turi=~/\S/) { # normal non-empty internal resource |
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my $mapdir=$uri; |
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$mapdir=~s/[^\/]+$//; |
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$turi=&Apache::lonnet::hreflocation($mapdir,$turi); |
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if (($embstyle eq 'img') |
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|| ($embstyle eq 'emb') |
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|| ($embstyle eq 'wrp')) { |
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$turi='/adm/wrapper'.$turi; |
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} |
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} |
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} |
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# Store reverse lookup, remove query string resource 'ids'_uri => resource id. |
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# If the URI appears more than one time in the sequence, it's resourcde |
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# id's are constructed as a comma spearated list. |
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my $idsuri=$turi; |
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$idsuri=~s/\?.+$//; |
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if (defined($hash{'ids_'.$idsuri})) { |
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$hash{'ids_'.$idsuri}.=','.$rid; |
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} else { |
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$hash{'ids_'.$idsuri}=''.$rid; |
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} |
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if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard|viewclasslist)$/) { |
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$turi.='?register=1'; |
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} |
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# resource id lookup: 'src'_resourc-di => URI decorated with a query |
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# parameter as above if necessary due to the resource type. |
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$hash{'src_'.$rid}=$turi; |
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# Mark the external-ness of the resource: |
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if ($token->[2]->{'external'} eq 'true') { |
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$hash{'ext_'.$rid}='true:'; |
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} else { |
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$hash{'ext_'.$rid}='false:'; |
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} |
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# If the resource is a start/finish resource set those |
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# entries in the has so that navigation knows where everything starts. |
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# TODO? If there is a malformed sequence that has no start or no finish |
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# resource, should this be detected and errors thrown? How would such a |
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# resource come into being other than being manually constructed by a person |
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# and then uploaded? Could that happen if an author decided a sequence was almost |
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# right edited it by hand and then reuploaded it to 'fix it' but accidently cut the |
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# start or finish resources? |
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# |
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# All resourcess also get a type_id => (start | finish | normal) hash entr. |
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# |
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if ($token->[2]->{'type'}) { |
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$hash{'type_'.$rid}=$token->[2]->{'type'}; |
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if ($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; |
|
&loadmap($turi,$rid); |
|
} |
|
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}=''.$linkid; |
|
} |
|
} |
|
|
if (($turi=~/\.course$/) || |
|
($turi=~/\.sequence$/) || |
|
($turi=~/\.page$/)) { |
|
$hash{'is_map_'.$rid}=1; |
|
&loadmap($turi); |
|
} |
|
|
|
} elsif ($token->[1] eq 'condition') { |
|
# ------------------------------------------------------------------- Condition |
# ------------------------------------------------------------------- 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'; |
|
} |
|
} |
|
|
my $rid=$lpc.'.'.$token->[2]->{'id'}; |
# ------------------------------------------------------------------- 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. |
|
# $lpc Current map nesting level.a |
|
# |
|
# Typical attributes: |
|
# to=n - Number of the resource the parameter applies to. |
|
# type=xx - Type of parameter value (e.g. string_yesno or int_pos). |
|
# name=xxx - Name ofr parameter (e.g. parameter_randompick or parameter_randomorder). |
|
# value=xxx - value of the parameter. |
|
|
|
sub parse_param { |
|
my ($token,$lpc) = @_; |
|
my $referid=$lpc.'.'.$token->[2]->{'to'}; # Resource param applies to. |
|
my $name=$token->[2]->{'name'}; # Name of parameter |
|
my $part; |
|
|
$hash{'kind_'.$rid}='cond'; |
|
$cond[$#cond+1]=$token->[2]->{'value'}; |
|
$hash{'condid_'.$rid}=$#cond; |
|
if ($token->[2]->{'type'}) { |
|
$cond[$#cond].=':'.$token->[2]->{'type'}; |
|
} else { |
|
$cond[$#cond].=':normal'; |
|
} |
|
|
|
} elsif ($token->[1] eq 'link') { |
if ($name=~/^parameter_(.*)_/) { |
# ----------------------------------------------------------------------- Links |
$part=$1; |
|
} else { |
|
$part=0; |
|
} |
|
|
$linkpc++; |
# Peel the parameter_ off the parameter name. |
my $linkid=$lpc.'.'.$linkpc; |
|
|
|
my $goesto=$lpc.'.'.$token->[2]->{'to'}; |
$name=~s/^.*_([^_]*)$/$1/; |
my $comesfrom=$lpc.'.'.$token->[2]->{'from'}; |
|
my $undercond=0; |
|
|
|
if ($token->[2]->{'condition'}) { |
# The value is: |
$undercond=$lpc.'.'.$token->[2]->{'condition'}; |
# type.part.name.value |
} |
|
|
|
$hash{'goesto_'.$linkid}=$goesto; |
my $newparam= |
$hash{'comesfrom_'.$linkid}=$comesfrom; |
&escape($token->[2]->{'type'}).':'. |
$hash{'undercond_'.$linkid}=$undercond; |
&escape($part.'.'.$name).'='. |
|
&escape($token->[2]->{'value'}); |
if (defined($hash{'to_'.$comesfrom})) { |
|
$hash{'to_'.$comesfrom}.=','.$linkid; |
# The hash key is param_resourceid. |
} else { |
# Multiple parameters for a single resource are & separated in the hash. |
$hash{'to_'.$comesfrom}=''.$linkid; |
|
} |
|
if (defined($hash{'from_'.$goesto})) { |
|
$hash{'from_'.$goesto}.=','.$linkid; |
|
} else { |
|
$hash{'from_'.$goesto}=''.$linkid; |
|
} |
|
} |
|
|
|
} |
|
} |
|
|
|
|
if (defined($hash{'param_'.$referid})) { |
|
$hash{'param_'.$referid}.='&'.$newparam; |
} else { |
} else { |
$errtext.='Map not loaded: The file does not exist. '; |
$hash{'param_'.$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 |
# --------------------------------------------------------- Simplify expression |
|
|
|
|
|
# |
|
# Someone should really comment this to describe what it does to what and why. |
|
# |
sub simplify { |
sub simplify { |
my $expression=shift; |
my $expression=shift; |
# "True and" is nothing |
# (0&1) = 1 |
$expression=~s/0\&//g; |
$expression=~s/\(0\&([_\.\d]+)\)/$1/g; |
# (8)=8 |
# (8)=8 |
$expression=~s/\((\d+)\)/$1/g; |
$expression=~s/\(([_\.\d]+)\)/$1/g; |
# 8&8=8 |
# 8&8=8 |
$expression=~s/(\d+)\&\1/$1/g; |
$expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g; |
# 8|8=8 |
# 8|8=8 |
$expression=~s/(\d+)\|\1/$1/g; |
$expression=~s/([^_\.\d])([_\.\d]+)(?:\|\2)+([^_\.\d])/$1$2$3/g; |
# (5&3)&4=5&3&4 |
# (5&3)&4=5&3&4 |
$expression=~s/\((\d+)\&(\d+)\)\&(\d+)/$1\&$2\&$3/g; |
$expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g; |
# (((5&3)|(4&6)))=((5&3)|(4&6)) |
# (((5&3)|(4&6)))=((5&3)|(4&6)) |
$expression=~ |
$expression=~ |
s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g; |
s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g; |
# ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2) |
# ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2) |
$expression=~ |
$expression=~ |
s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g; |
s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g; |
return $expression; |
return $expression; |
} |
} |
|
|
# -------------------------------------------------------- Build condition hash |
# -------------------------------------------------------- Build condition hash |
|
|
|
# |
|
# Traces a route recursively through the map after it has been loaded |
|
# (I believe this really visits each resourcde that is reachable fromt he |
|
# start top node. |
|
# |
|
# - Marks hidden resources as hidden. |
|
# - Marks which resource URL's must be encrypted. |
|
# - Figures out (if necessary) the first resource in the map. |
|
# - Further builds the chunks of the big hash that define how |
|
# conditions work |
|
# |
|
# Note that the tracing strategy won't visit resources that are not linked to |
|
# anything or islands in the map (groups of resources that form a path but are not |
|
# linked in to the path that can be traced from the start resource...but that's ok |
|
# because by definition, those resources are not reachable by users of the course. |
|
# |
|
# Parameters: |
|
# sofar - _URI of the prior entry or 0 if this is the top. |
|
# rid - URI of the resource to visit. |
|
# beenhere - list of resources (each resource enclosed by &'s) that have |
|
# already been visited. |
|
# encflag - If true the resource that resulted in a recursive call to us |
|
# has an encoded URL (which means contained resources should too). |
|
# hdnflag - If true,the resource that resulted in a recursive call to us |
|
# was hidden (which means contained resources should be hidden too). |
|
# Returns |
|
# new value indicating how far the map has been traversed (the sofar). |
|
# |
sub traceroute { |
sub traceroute { |
my ($sofar,$rid,$beenhere)=@_; |
my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_; |
$sofar=simplify($sofar); |
my $newsofar=$sofar=simplify($sofar); |
unless ($beenhere=~/\&$rid\&/) { |
|
$beenhere.=$rid.'&'; |
unless ($beenhere=~/\&\Q$rid\E\&/) { |
if (defined($hash{'conditions_'.$rid})) { |
$beenhere.=$rid.'&'; |
$hash{'conditions_'.$rid}=simplify( |
my ($mapid,$resid)=split(/\./,$rid); |
|
my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid}); |
|
my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb); |
|
|
|
if ($hdnflag || lc($hidden) eq 'yes') { |
|
$hiddenurl{$rid}=1; |
|
} |
|
if (!$hdnflag && lc($hidden) eq 'no') { |
|
delete($hiddenurl{$rid}); |
|
} |
|
|
|
my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb); |
|
if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; } |
|
|
|
if (($retfrid eq '') && ($hash{'src_'.$rid}) |
|
&& ($hash{'src_'.$rid}!~/\.sequence$/)) { |
|
$retfrid=$rid; |
|
} |
|
|
|
if (defined($hash{'conditions_'.$rid})) { |
|
$hash{'conditions_'.$rid}=simplify( |
'('.$hash{'conditions_'.$rid}.')|('.$sofar.')'); |
'('.$hash{'conditions_'.$rid}.')|('.$sofar.')'); |
} else { |
} else { |
$hash{'conditions_'.$rid}=$sofar; |
$hash{'conditions_'.$rid}=$sofar; |
} |
} |
if (defined($hash{'is_map_'.$rid})) { |
|
if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) { |
# if the expression is just the 0th condition keep it |
&traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&'); |
# otherwise leave a pointer to this condition expression |
if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) { |
|
$sofar= |
$newsofar = ($sofar eq '0') ? $sofar : '_'.$rid; |
$hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}}; |
|
} |
# Recurse if the resource is a map: |
} |
|
} |
if (defined($hash{'is_map_'.$rid})) { |
if (defined($hash{'to_'.$rid})) { |
if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) { |
map { |
$sofar=$newsofar= |
|
&traceroute($sofar, |
|
$hash{'map_start_'.$hash{'src_'.$rid}}, |
|
$beenhere, |
|
$encflag || $encurl{$rid}, |
|
$hdnflag || $hiddenurl{$rid}); |
|
} |
|
} |
|
|
|
# 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; |
my $further=$sofar; |
if ($hash{'undercond_'.$_}) { |
# |
if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) { |
# If there's a condition associated with this link be sure |
$further=simplify('('.$further.')&('. |
# it's been defined else that's an error: |
$hash{'condid_'.$hash{'undercond_'.$_}}.')'); |
# |
} else { |
if ($hash{'undercond_'.$id}) { |
$errtext.='Undefined condition ID: ' |
if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) { |
.$hash{'undercond_'.$_}.'. '; |
$further=simplify('('.'_'.$rid.')&('. |
} |
$hash{'condid_'.$hash{'undercond_'.$id}}.')'); |
|
} else { |
|
$errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id}); |
|
} |
} |
} |
&traceroute($further,$hash{'goesto_'.$_},$beenhere); |
# Recurse to resoruces that have to's to us. |
} split(/\,/,$hash{'to_'.$rid}); |
$newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere, |
} |
$encflag,$hdnflag); |
|
} |
|
} |
|
} |
|
return $newsofar; |
|
} |
|
|
|
# ------------------------------ Cascading conditions, quick access, parameters |
|
|
|
# |
|
# Seems a rather strangely named sub given what the comment above says it does. |
|
|
|
|
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sub accinit { |
|
my ($uri,$short,$fn)=@_; |
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my %acchash=(); |
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my %captured=(); |
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my $condcounter=0; |
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$acchash{'acc.cond.'.$short.'.0'}=0; |
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|
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# This loop is only interested in conditions and |
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# parameters in the big hash: |
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|
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foreach my $key (keys(%hash)) { |
|
|
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# conditions: |
|
|
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if ($key=~/^conditions/) { |
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my $expr=$hash{$key}; |
|
|
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# try to find and factor out common sub-expressions |
|
# Any subexpression that is found is simplified, removed from |
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# the original condition expression and the simplified sub-expression |
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# substituted back in to the epxression..I'm not actually convinced this |
|
# factors anything out...but instead maybe simplifies common factors(?) |
|
|
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foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) { |
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my $orig=$sub; |
|
|
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my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/); |
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next if (!defined($factor)); |
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|
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$sub=~s/\Q$factor\E//g; |
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$sub=~s/^\(/\($factor\(/; |
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$sub.=')'; |
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$sub=simplify($sub); |
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$expr=~s/\Q$orig\E/$sub/; |
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} |
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$hash{$key}=$expr; |
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|
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# If not yet seen, record in acchash and that we've seen it. |
|
|
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unless (defined($captured{$expr})) { |
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$condcounter++; |
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$captured{$expr}=$condcounter; |
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$acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr; |
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} |
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# Parameters: |
|
|
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} elsif ($key=~/^param_(\d+)\.(\d+)/) { |
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my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2, |
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$hash{'src_'.$1.'.'.$2}); |
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foreach my $param (split(/\&/,$hash{$key})) { |
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my ($typename,$value)=split(/\=/,$param); |
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my ($type,$name)=split(/\:/,$typename); |
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$parmhash{$prefix.'.'.&unescape($name)}= |
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&unescape($value); |
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$parmhash{$prefix.'.'.&unescape($name).'.type'}= |
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&unescape($type); |
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} |
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} |
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} |
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# This loop only processes id entries in the big hash. |
|
|
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foreach my $key (keys(%hash)) { |
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if ($key=~/^ids/) { |
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foreach my $resid (split(/\,/,$hash{$key})) { |
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my $uri=$hash{'src_'.$resid}; |
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my ($uripath,$urifile) = |
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&Apache::lonnet::split_uri_for_cond($uri); |
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if ($uripath) { |
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my $uricond='0'; |
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if (defined($hash{'conditions_'.$resid})) { |
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$uricond=$captured{$hash{'conditions_'.$resid}}; |
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} |
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if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) { |
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if ($acchash{'acc.res.'.$short.'.'.$uripath}=~ |
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/(\&\Q$urifile\E\:[^\&]*)/) { |
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my $replace=$1; |
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my $regexp=$replace; |
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#$regexp=~s/\|/\\\|/g; |
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$acchash{'acc.res.'.$short.'.'.$uripath} =~ |
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s/\Q$regexp\E/$replace\|$uricond/; |
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} else { |
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$acchash{'acc.res.'.$short.'.'.$uripath}.= |
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$urifile.':'.$uricond.'&'; |
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} |
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} else { |
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$acchash{'acc.res.'.$short.'.'.$uripath}= |
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'&'.$urifile.':'.$uricond.'&'; |
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} |
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} |
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} |
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} |
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} |
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$acchash{'acc.res.'.$short.'.'}='&:0&'; |
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my $courseuri=$uri; |
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$courseuri=~s/^\/res\///; |
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my $regexp = 1; |
|
&Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp); |
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&Apache::lonnet::appenv(\%acchash); |
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} |
|
|
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# ---------------- Selectively delete from randompick maps and hidden url parms |
|
|
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sub hiddenurls { |
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my $randomoutentry=''; |
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foreach my $rid (keys %randompick) { |
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my $rndpick=$randompick{$rid}; |
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my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}}; |
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# ------------------------------------------- put existing resources into array |
|
my @currentrids=(); |
|
foreach my $key (sort(keys(%hash))) { |
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if ($key=~/^src_($mpc\.\d+)/) { |
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if ($hash{'src_'.$1}) { push @currentrids, $1; } |
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} |
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} |
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# rids are number.number and we want to numercially sort on |
|
# the second number |
|
@currentrids=sort { |
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my (undef,$aid)=split(/\./,$a); |
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my (undef,$bid)=split(/\./,$b); |
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$aid <=> $bid; |
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} @currentrids; |
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next if ($#currentrids<$rndpick); |
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# -------------------------------- randomly eliminate the ones that should stay |
|
my (undef,$id)=split(/\./,$rid); |
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if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; } |
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my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb |
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&Apache::lonnet::setup_random_from_rndseed($rndseed); |
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my @whichids=&Math::Random::random_permuted_index($#currentrids+1); |
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for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; } |
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#&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids)); |
|
# -------------------------------------------------------- delete the leftovers |
|
for (my $k=0; $k<=$#currentrids; $k++) { |
|
if ($currentrids[$k]) { |
|
$hash{'randomout_'.$currentrids[$k]}=1; |
|
my ($mapid,$resid)=split(/\./,$currentrids[$k]); |
|
$randomoutentry.='&'. |
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&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, |
|
$resid, |
|
$hash{'src_'.$currentrids[$k]} |
|
).'&'; |
|
} |
|
} |
|
} |
|
# ------------------------------ take care of explicitly hidden urls or folders |
|
foreach my $rid (keys %hiddenurl) { |
|
$hash{'randomout_'.$rid}=1; |
|
my ($mapid,$resid)=split(/\./,$rid); |
|
$randomoutentry.='&'. |
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&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid, |
|
$hash{'src_'.$rid}).'&'; |
|
} |
|
# --------------------------------------- append randomout entry to environment |
|
if ($randomoutentry) { |
|
&Apache::lonnet::appenv({'acc.randomout' => $randomoutentry}); |
} |
} |
} |
} |
|
|
# ---------------------------------------------------- Read map and all submaps |
# ---------------------------------------------------- Read map and all submaps |
|
|
sub readmap { |
sub readmap { |
my $uri=shift; |
my $short=shift; |
@cond=('true:normal'); |
$short=~s/^\///; |
%hash=(); |
|
$errtext=''; |
# TODO: Hidden dependency on current user: |
$pc=0; |
|
loadmap($uri); |
my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1}); |
if (defined($hash{'map_start_'.$uri})) { |
|
&traceroute('0',$hash{'map_start_'.$uri},'&'); |
my $fn=$cenv{'fn'}; |
} |
my $uri; |
} |
$short=~s/\//\_/g; |
|
unless ($uri=$cenv{'url'}) { |
# ---------------------------------------------------------------- Testing only |
&Apache::lonnet::logthis('<font color="blue">WARNING: '. |
|
"Could not load course $short.</font>"); |
sub handler { |
return ('',&mt('No course data available.'));; |
my $r = shift; |
} |
$r->content_type('text/html'); |
@cond=('true:normal'); |
$r->send_http_header; |
|
return OK if $r->header_only; |
unless (open(LOCKFILE,">$fn.db.lock")) { |
readmap('/res/msu/korte/foo.course'); |
# |
$r->print("<html><body>\n"); |
# Most likely a permissions problem on the lockfile or its directory. |
my $hashkey; |
# |
foreach $hashkey (sort keys %hash) { |
$retfurl = ''; |
$r->print("$hashkey: $hash{$hashkey}<br>\n"); |
return ($retfurl,'<br />'.&mt('Map not loaded - Lock file could not be opened when reading map:').' <tt>'.$fn.'</tt>.'); |
} |
} |
my $i; |
my $lock=0; |
$r->print('<hr>'); |
my $gotstate=0; |
for ($i=0;$i<=$#cond;$i++) { |
|
$r->print($i.' : '.$cond[$i]."<br>\n"); |
# 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 %hiddenurl; |
|
undef %encurl; |
|
$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 %hiddenurl; |
|
undef %encurl; |
|
$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? |
} |
} |
$r->print("<h1>$errtext</h1></body></html>\n"); |
# ------------------------------------------------- Check for critical messages |
return OK; |
|
|
# Depends on user must parameterize this as well..or separate as this is: |
|
# more part of determining what someone sees on entering a course? |
|
|
|
my @what=&Apache::lonnet::dump('critical',$env{'user.domain'}, |
|
$env{'user.name'}); |
|
if ($what[0]) { |
|
if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { |
|
$retfurl='/adm/email?critical=display'; |
|
} |
|
} |
|
return ($retfurl,$errtext); |
} |
} |
|
|
|
# |
|
# 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'); |
|
|
|
# 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},'&'); |
|
&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>"); |
|
} |
|
} |
|
return $gotstate; |
|
} |
|
|
|
sub unlink_tmpfiles { |
|
my ($fn) = @_; |
|
my $file_dir = dirname($fn); |
|
|
|
if ($fn 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 $state; |
|
} |
|
|
|
# This block seems to have code to manage/detect doubly defined |
|
# aliases in maps. |
|
|
|
{ |
|
my %mapalias_cache; |
|
sub count_mapalias { |
|
my ($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]" <br /> in Map "[_2]"', |
|
$hash{'title_'.$id}, |
|
$hash{'title_'.$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 $error_text; |
|
} |
|
sub clear_mapalias_count { |
|
undef(%mapalias_cache); |
|
} |
|
} |
1; |
1; |
__END__ |
__END__ |
|
|
|
=head1 NAME |
|
|
|
Apache::lonuserstate - Construct and maintain state and binary representation |
|
of course for user |
|
|
|
=head1 SYNOPSIS |
|
|
|
Invoked by lonroles.pm. |
|
|
|
&Apache::lonuserstate::readmap($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 |