# The LearningOnline Network with CAPA # Interface routines to R CAS # # $Id: lonr.pm,v 1.4 2009/04/18 23:43:50 www 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::lonr; use strict; use IO::Socket; use Apache::lonnet; use Apache::response(); use LONCAPA; sub connect { return IO::Socket::UNIX->new(Peer => $Apache::lonnet::perlvar{'lonSockDir'}.'/rsock', Type => SOCK_STREAM, Timeout => 10); } sub disconnect { my ($socket)=@_; if ($socket) { close($socket); } } sub rreply { my ($socket,$cmd)=@_; if ($socket) { print $socket &escape($cmd)."\n"; my $reply=<$socket>; chomp($reply); if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; } return &unescape($reply); } else { return 'Error: no connection.'; } } sub blacklisted { my ($cmd)=@_; foreach my $forbidden ( 'read','write','scan','save','socket','connections', 'open','close', 'plot','X11','windows','quartz', 'postscript','pdf','png','jpeg', 'dev\.list','dev\.next','dev\.prev','dev\.set', 'dev\.off','dev\.copy','dev\.print','graphics', 'library','package','source','sink','objects', 'Sys\.','unlink','file\.','on\.exit','error', 'q\(\)' ) { if ($cmd=~/$forbidden/s) { return 1; } } return 0; } sub r_allowed_libraries { return ('boot','class','cluster','datasets','KernSmooth','MASS', 'methods','mgcv','nlme','nnet','rpart','spatial', 'splines','stats','stats4','survival'); } sub r_is_allowed_library { my ($library)=@_; foreach my $allowed_library (&r_allowed_libraries()) { if ($library eq $allowed_library) { return 1; } } return 0; } sub runscript { my ($socket,$fullscript,$libraries)=@_; if (&blacklisted($fullscript)) { return 'Error: blacklisted'; } my $reply; $fullscript=~s/[\n\r\l]//gs; if ($libraries) { foreach my $library (split(/\s*\,\s*/,$libraries)) { unless ($library=~/\w/) { next; } if (&r_is_allowed_library($library)) { $reply=&rreply($socket,'library('.$library.');'."\n"); if ($reply=~/^Error\:/) { return $reply; } } else { return 'Error: blacklisted'; } } } foreach my $line (split(/\;/s,$fullscript)) { if ($line=~/\w/) { $reply=&rreply($socket,$line.";\n"); } if ($reply=~/^Error\:/) { return $reply; } } $reply=~s/^\s*//gs; $reply=~s/\s*$//gs; &Apache::lonxml::debug("r $fullscript \n reply $reply"); return $reply; } sub r_cas_formula_fix { my ($expression)=@_; return &Apache::response::implicit_multiplication($expression); } sub r_run { my ($script,$submission,$argument,$libraries) = @_; my $socket=&connect(); my @submissionarray=split(/\s*\,\s*/,$submission); for (my $i=0;$i<=$#submissionarray;$i++) { my $n=$i+1; my $fixedsubmission=&r_cas_formula_fix($submissionarray[$i]); $script=~s/RESPONSE\[$n\]/$fixedsubmission/gs; } my @argumentarray=@{$argument}; for (my $i=0;$i<=$#argumentarray;$i++) { my $n=$i+1; my $fixedargument=&r_cas_formula_fix($argumentarray[$i]); $script=~s/LONCAPALIST\[$n\]/$fixedargument/gs; } my $reply=&runscript($socket,$script,$libraries); &disconnect($socket); if ($reply=~/^\s*true\s*$/i) { return 'EXACT_ANS'; } if ($reply=~/^\s*false\s*$/i) { return 'INCORRECT'; } return 'BAD_FORMULA'; } sub r_eval { my ($script,$libraries) = @_; my $socket=&connect(); my $reply=&runscript($socket,$script,$libraries); &disconnect($socket); return $reply; } sub compareterms { my ($socket,$terma,$termb)=@_; my $difference=$terma.'-('.$termb.')'; if (&blacklisted($difference)) { return 'Error: blacklisted'; } my $reply=&rreply($socket,$difference.';'); if ($reply=~/^\s*0\s*$/) { return 'true'; } if ($reply=~/^Error\:/) { return $reply; } return 'false'; } sub r_check { my ($response,$answer,$reterror) = @_; my $socket=&connect(); my $reply=&compareterms($socket,$response,$answer); &disconnect($socket); # integer to string mappings come from capaParser.h # 1 maps to 'EXACT_ANS' if ($reply eq 'true') { return 1; } # 11 maps to 'BAD_FORMULA' if ($reply=~/^Error\:/) { return 11; } # 7 maps to 'INCORRECT' return 7; } 1; __END__;