1: package Apache::run;
2: #
3: # $Id: run.pm,v 1.39 2003/06/18 21:04:42 albertel Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27:
28: use HTML::Entities;
29:
30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
31: my %_LONCAPA_INTERNAL_oldexpressions=();
32: while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
33: $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
34: $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
35: if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
36: }
37: ENDEVALUATE
38:
39: sub evaluate {
40: my ($expression,$safeeval,$decls) = @_;
41: unless (defined($expression)) { return ''; }
42: if ($Apache::lonxml::evaluate < 1) { return $expression; }
43: my $result = '';
44: $@='';
45: $Apache::run::timeout=0;
46: $main::SIG{'ALRM'} = sub {
47: $Apache::run::timeout=1;
48: die("timeout");
49: };
50: my $innererror;
51: eval {
52: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
53: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
54: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
55: $innererror=$@;
56: alarm(0);
57: };
58: my $error=$@;
59: if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
60: $result = $safeeval->reval('return $_;');
61: chomp $result;
62: } else {
63: if ($Apache::run::timeout) {
64: $error = 'Code ran too long. It ran for more than '.
65: Apache->request->server->timeout.' seconds';
66: }
67: &Apache::lonxml::error('substitution on <pre>'.
68: &HTML::Entities::encode($expression).
69: '</pre> with <pre>'.
70: &HTML::Entities::encode($decls).
71: '</pre> caused <pre>'.
72: &HTML::Entities::encode($error).' '.
73: &HTML::Entities::encode($innererror).
74: '</pre>');
75: }
76: return $result
77: }
78:
79: sub run {
80: my ($code,$safeeval,$hideerrors) = @_;
81: my @result;
82: $@='';
83: $Apache::run::timeout=0;
84: $main::SIG{'ALRM'} = sub {
85: $Apache::run::timeout=1;
86: die("timeout");
87: };
88: my $innererror;
89: eval {
90: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
91: @result=$safeeval->reval($code);
92: $innererror=$@;
93: alarm(0);
94: };
95: my $error=$@;
96: if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
97: if ($Apache::run::timeout) {
98: $error = 'Code ran too long. It ran for more than '.
99: Apache->request->server->timeout.' seconds';
100: }
101: &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).' '.
102: &HTML::Entities::encode($innererror).
103: '</pre> occured while running <pre>'.
104: &HTML::Entities::encode($code).'</pre>');
105: }
106: if ( $#result < '1') {
107: return $result[0];
108: } else {
109: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
110: return (@result);
111: }
112: }
113:
114: sub dump {
115: my ($target,$safeeval)=@_;
116: my $dump='';
117: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
118: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
119: my $line;
120: if ($safeeval->reval('defined($'.$symname.')')) {
121: $line='$'.$symname.'='.$safeeval->reval('$'.$symname);
122: }
123: if ($safeeval->reval('defined(@'.$symname.')')) {
124: $line='@'.$symname.'=('.
125: $safeeval->reval('join(",",@'.$symname.')').")";
126: }
127: if ($safeeval->reval('defined(%'.$symname.')')) {
128: $line='%'.$symname.'=(';
129: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
130: $symname.'{$_} } sort keys %'.
131: $symname.')').")"
132: }
133: if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />"; }
134: }
135: }
136: $dump.='';
137: return $dump;
138: }
139:
140: 1;
141: __END__;
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