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* Some more blacklisted stuff
* Eliminate debugging code
* Templates for using R

    1: # The LearningOnline Network with CAPA
    2: # Interface routines to R CAS
    3: #
    4: # $Id: lonr.pm,v 1.4 2009/04/18 23:43:50 www Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28:  
   29: package Apache::lonr;
   30:  
   31: use strict;
   32: use IO::Socket;
   33: use Apache::lonnet;
   34: use Apache::response();
   35: use LONCAPA;
   36: 
   37: sub connect {
   38:    return IO::Socket::UNIX->new(Peer    => $Apache::lonnet::perlvar{'lonSockDir'}.'/rsock',
   39: 				Type    => SOCK_STREAM,
   40: 				Timeout => 10);
   41: }
   42: 
   43: sub disconnect {
   44:     my ($socket)=@_;
   45:     if ($socket) { close($socket); }
   46: }
   47: 
   48: sub rreply {
   49:     my ($socket,$cmd)=@_;
   50:     if ($socket) {
   51: 	print $socket &escape($cmd)."\n";
   52:         my $reply=<$socket>;
   53:         chomp($reply);
   54:         if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; }
   55:         return &unescape($reply);
   56:     } else {
   57:         return 'Error: no connection.';
   58:     }
   59: }
   60: 
   61: sub blacklisted {
   62:     my ($cmd)=@_;
   63:     foreach my $forbidden (
   64:         'read','write','scan','save','socket','connections',
   65:         'open','close',
   66:         'plot','X11','windows','quartz',
   67:         'postscript','pdf','png','jpeg',
   68:         'dev\.list','dev\.next','dev\.prev','dev\.set',
   69:         'dev\.off','dev\.copy','dev\.print','graphics',
   70:         'library','package','source','sink','objects',
   71:         'Sys\.','unlink','file\.','on\.exit','error',
   72:         'q\(\)'
   73:      ) {
   74: 	if ($cmd=~/$forbidden/s) { return 1; }
   75:     } 
   76:     return 0;
   77: }
   78: 
   79: sub r_allowed_libraries {
   80:    return ('boot','class','cluster','datasets','KernSmooth','MASS',
   81:            'methods','mgcv','nlme','nnet','rpart','spatial',
   82:            'splines','stats','stats4','survival');
   83: }
   84: 
   85: sub r_is_allowed_library {
   86:     my ($library)=@_;
   87:     foreach my $allowed_library (&r_allowed_libraries()) {
   88:        if ($library eq $allowed_library) { return 1; }
   89:     }
   90:     return 0;
   91: }
   92: 
   93: sub runscript {
   94:     my ($socket,$fullscript,$libraries)=@_;
   95:     if (&blacklisted($fullscript)) { return 'Error: blacklisted'; }
   96:     my $reply;
   97:     $fullscript=~s/[\n\r\l]//gs;
   98:     if ($libraries) {
   99:        foreach my $library (split(/\s*\,\s*/,$libraries)) {
  100:           unless ($library=~/\w/) { next; }
  101:           if (&r_is_allowed_library($library)) {
  102:               $reply=&rreply($socket,'library('.$library.');'."\n");
  103:               if ($reply=~/^Error\:/) { return $reply; }
  104:           } else { 
  105:              return 'Error: blacklisted'; 
  106:           }
  107:        }
  108:     }
  109:     foreach my $line (split(/\;/s,$fullscript)) {
  110: 	if ($line=~/\w/) { $reply=&rreply($socket,$line.";\n"); }
  111: 	if ($reply=~/^Error\:/) { return $reply; }
  112:     }
  113:     $reply=~s/^\s*//gs;
  114:     $reply=~s/\s*$//gs;
  115:     &Apache::lonxml::debug("r $fullscript \n reply $reply");
  116:     return $reply;
  117: }
  118: 
  119: sub r_cas_formula_fix {
  120:    my ($expression)=@_;
  121:    return &Apache::response::implicit_multiplication($expression);
  122: }
  123: 
  124: sub r_run {
  125:     my ($script,$submission,$argument,$libraries) = @_;
  126:     my $socket=&connect();
  127:     my @submissionarray=split(/\s*\,\s*/,$submission);
  128:     for (my $i=0;$i<=$#submissionarray;$i++) {
  129:         my $n=$i+1;
  130:         my $fixedsubmission=&r_cas_formula_fix($submissionarray[$i]);
  131:         $script=~s/RESPONSE\[$n\]/$fixedsubmission/gs;
  132:     }
  133:     my @argumentarray=@{$argument};
  134:     for (my $i=0;$i<=$#argumentarray;$i++) {
  135:         my $n=$i+1;
  136:         my $fixedargument=&r_cas_formula_fix($argumentarray[$i]);
  137:         $script=~s/LONCAPALIST\[$n\]/$fixedargument/gs;
  138:     }
  139:     my $reply=&runscript($socket,$script,$libraries);
  140:     &disconnect($socket);
  141:     if ($reply=~/^\s*true\s*$/i) { return 'EXACT_ANS'; }
  142:     if ($reply=~/^\s*false\s*$/i) { return 'INCORRECT'; } 
  143:     return 'BAD_FORMULA';
  144: }
  145: 
  146: sub r_eval {
  147:     my ($script,$libraries) = @_;
  148:     my $socket=&connect();
  149:     my $reply=&runscript($socket,$script,$libraries);
  150:     &disconnect($socket);
  151:     return $reply;
  152: }
  153: 
  154: 
  155: sub compareterms {
  156:     my ($socket,$terma,$termb)=@_;
  157:     my $difference=$terma.'-('.$termb.')';
  158:     if (&blacklisted($difference)) { return 'Error: blacklisted'; }
  159:     my $reply=&rreply($socket,$difference.';');
  160:     if ($reply=~/^\s*0\s*$/) { return 'true'; }
  161:     if ($reply=~/^Error\:/) { return $reply; }
  162:     return 'false';
  163: }
  164: 
  165: sub r_check {
  166:     my ($response,$answer,$reterror) = @_;
  167:     my $socket=&connect();
  168:     my $reply=&compareterms($socket,$response,$answer);
  169:     &disconnect($socket);
  170:     # integer to string mappings come from capaParser.h
  171:     # 1 maps to 'EXACT_ANS'
  172:     if ($reply eq 'true') { return 1; }
  173:     # 11 maps to 'BAD_FORMULA'
  174:     if ($reply=~/^Error\:/) { return 11; }
  175:     # 7 maps to 'INCORRECT'
  176:     return 7;
  177: }
  178:  
  179: 1;
  180: __END__;