1: package Apache::run;
2: #
3: # $Id: run.pm,v 1.37 2003/06/09 21:37:54 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: &Apache::lonxml::debug("got $expression and decls $decls");
42: unless (defined($expression)) { return ''; }
43: if ($Apache::lonxml::evaluate < 1) { return $expression; }
44: my $result = '';
45: $@='';
46: $Apache::run::timeout=0;
47: $main::SIG{'ALRM'} = sub {
48: $Apache::run::timeout=1;
49: die("timeout");
50: };
51: my $innererror;
52: eval {
53: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
54: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
55: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
56: $innererror=$@;
57: alarm(0);
58: };
59: my $error=$@;
60: if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
61: $result = $safeeval->reval('return $_;');
62: chomp $result;
63: } else {
64: if ($Apache::run::timeout) {
65: $error = 'Code ran too long. It ran for more than '.
66: Apache->request->server->timeout.' seconds';
67: }
68: &Apache::lonxml::error('substitution on <pre>'.
69: &HTML::Entities::encode($expression).
70: '</pre> with <pre>'.
71: &HTML::Entities::encode($decls).
72: '</pre> caused <pre>'.
73: &HTML::Entities::encode($error).' '.
74: &HTML::Entities::encode($innererror).
75: '</pre>');
76: }
77: return $result
78: }
79:
80: sub run {
81: my ($code,$safeeval,$hideerrors) = @_;
82: my @result;
83: $@='';
84: $Apache::run::timeout=0;
85: $main::SIG{'ALRM'} = sub {
86: $Apache::run::timeout=1;
87: die("timeout");
88: };
89: my $innererror;
90: eval {
91: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
92: @result=$safeeval->reval($code);
93: $innererror=$@;
94: alarm(0);
95: };
96: my $error=$@;
97: if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
98: if ($Apache::run::timeout) {
99: $error = 'Code ran too long. It ran for more than '.
100: Apache->request->server->timeout.' seconds';
101: }
102: &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).' '.
103: &HTML::Entities::encode($innererror).
104: '</pre> occured while running <pre>'.
105: &HTML::Entities::encode($code).'</pre>');
106: }
107: if ( $#result < '1') {
108: return $result[0];
109: } else {
110: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
111: return (@result);
112: }
113: }
114:
115: sub dump {
116: my ($target,$safeeval)=@_;
117: my $dump='';
118: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
119: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
120: my $line;
121: if ($safeeval->reval('defined($'.$symname.')')) {
122: $line='$'.$symname.'='.$safeeval->reval('$'.$symname);
123: }
124: if ($safeeval->reval('defined(@'.$symname.')')) {
125: $line='@'.$symname.'=('.
126: $safeeval->reval('join(",",@'.$symname.')').")";
127: }
128: if ($safeeval->reval('defined(%'.$symname.')')) {
129: $line='%'.$symname.'=(';
130: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
131: $symname.'{$_} } sort keys %'.
132: $symname.')').")"
133: }
134: if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; }
135: }
136: }
137: $dump.='';
138: return $dump;
139: }
140:
141: 1;
142: __END__;
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