3 # $Id: SWCGI.pm,v 1.3 2004/04/08 01:52:19 mdw Exp $
5 # Miscellaneous CGI support functions
10 #----- Licensing notice -----------------------------------------------------
12 # This file is part of sw-tools.
14 # sw-tools is free software; you can redistribute it and/or modify
15 # it under the terms of the GNU General Public License as published by
16 # the Free Software Foundation; either version 2 of the License, or
17 # (at your option) any later version.
19 # sw-tools is distributed in the hope that it will be useful,
20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 # GNU General Public License for more details.
24 # You should have received a copy of the GNU General Public License
25 # along with sw-tools; if not, write to the Free Software Foundation,
26 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 #----- Package header -------------------------------------------------------
36 @EXPORT = qw(barf %Q $ref);
37 @EXPORT_OK = qw(read sanitize);
38 %EXPORT_TAGS = (layout => [qw(header footer)],
39 debug => [qw(dumphash)]);
41 Exporter::export_ok_tags(qw(layout debug));
43 #----- Layout control -------------------------------------------------------
47 # --- @header(TITLE)@ --
49 # Emit an HTML header. This can be customized as required. Something
50 # sensible happens if a header has already been emitted.
62 Content-Type: text/html
64 <!doctype html public "-//W3C//DTD HTML 3.2 Final//EN">
67 </title></head><body bgcolor=white>
75 # Emit an HTML footer to a page.
79 <hr><div align=right><font size="-1"><i>
80 sw.cgi ($C{pkg} $C{version})
81 </i></font></div></body></html>
85 #----- Useful functions -----------------------------------------------------
87 # --- @barf(ERROR)@ ---
89 # Reports an error and exits. The error is lovingly trapped in an HTML
90 # wrapper so that it can appropriately terrify a user.
94 header("Internal error in sw.cgi");
97 Internal error in sw.cgi
102 <p>This may be a result of a broken link or a server misconfiguration,
103 or it might be a bug in sw.cgi itself. Please report this problem to
104 your <a href="mailto:$ENV{SERVER_ADMIN}">server administrator</a> to
111 #----- Debugging ------------------------------------------------------------
113 # --- @dumphash(HASH)@ ---
115 # Dumps a hash out in a tabular format.
119 print "<table border=1 bgcolor=lightgrey>\n";
120 foreach my $k (sort(keys(%$h))) {
121 print " <tr><th align=left>$k<td>$h->{$k}\n";
126 #----- Sanitizing links -----------------------------------------------------
130 $l =~ s/[+&%=]/"%" . sprintf("%02x", ord($&))/eg;
132 $l =~ s/[^!-~]/"%" . sprintf("%02x", ord($&))/eg;
136 #----- Argument reading -----------------------------------------------------
139 $ref = "/cgi-bin/sw.cgi";
141 # --- @read([QUERY])@ ---
143 # Reads arguments from a web server.
148 # --- Read in the query string ---
150 # If a query is supplied as an argument then use that. Otherwise use the
151 # `REQUEST_METHOD' variable. Accept `GET' or `POST', and use the
152 # appropriate method for getting the data. If the variable wasn't set,
153 # read the command line arguments. If it's something I don't understand,
156 unless (defined($q)) {
157 my $meth = $ENV{"REQUEST_METHOD"};
158 if ($meth eq "GET") {
159 $q = $ENV{"QUERY_STRING"};
160 } elsif ($meth eq "PUT") {
163 } elsif (!defined($meth)) {
164 $q = join("&", @ARGV);
166 barf("unsupported requst method `$meth'");
170 # --- Parse it up into little bits ---
172 foreach my $pair (split(/\&/, $q)) {
173 my ($k, $v) = split(/\=/, $pair);
174 $k =~ tr/+/ /; $k =~ s/\%([0-9A-Fa-f][0-9A-Fa-f])/chr(hex($1))/eg;
175 $v =~ tr/+/ /; $v =~ s/\%([0-9A-Fa-f][0-9A-Fa-f])/chr(hex($1))/eg;
179 # --- Set other bits of data from this ---
181 $ENV{"SCRIPT_NAME"} and $ref = $ENV{"SCRIPT_NAME"};
184 #----- That's all, folks ----------------------------------------------------