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Annotation of loncom/cgi/plot.gif, revision 1.11

1.5       matthew     1: #!/usr/bin/perl
1.1       matthew     2: #
1.11    ! matthew     3: # $Id: plot.gif,v 1.10 2003/09/24 21:15:55 matthew Exp $
1.1       matthew     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/cgi-bin/plot.gif
                     24: #
                     25: # http://www.lon-capa.org/
                     26: #
1.6       matthew    27: use strict;
                     28: 
                     29: $|=1;
1.4       matthew    30: 
1.5       matthew    31: my $tmpdir = '/home/httpd/perl/tmp/';
1.8       matthew    32: my %data;
                     33: foreach (split/&/,$ENV{'QUERY_STRING'}) {
                     34:     my ($name,$value)=split/=/;
                     35:     $data{$name}=$value;
1.7       matthew    36: }
1.8       matthew    37: my $filename = $data{'file'};
1.9       matthew    38: # unescape filename
                     39: $filename =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                     40: 
1.8       matthew    41: die if ($filename =~ /\// || $filename !~ /_plot.data$/);
1.7       matthew    42: $filename = $tmpdir . $filename;
1.8       matthew    43: die "$data{'file'} does not exist\n" if (! -e $filename);
                     44: 
                     45: my $output = $data{'output'};
1.11    ! matthew    46: if ($output eq 'gif' || $output eq 'png') {
1.6       matthew    47:     open PLOT, "gnuplot $filename |";
                     48:     print <<"END";
1.11    ! matthew    49: Content-type: image/$output
1.1       matthew    50: 
1.5       matthew    51: END
1.6       matthew    52:     while ($_=<PLOT>) {
                     53: 	print;
                     54:     }
1.8       matthew    55: } elsif ($output eq 'eps') {
1.10      matthew    56:     print <<"END";
                     57: Content-type: text/html
                     58: 
                     59: <html><head><title>eps plot creation</title></head>
                     60: <body>
                     61: <h2>Creating eps plot</h2>
                     62: 
                     63: END
                     64:     if (! system ("gnuplot $filename")) {
                     65:         print "<h2>An error occured.</h2>\n".
                     66:             "I am not going to tell you about it as I have not bothered ".
                     67:             "to figure out how to get you the error text.\n";
                     68:     } else {
                     69:         print "<h2>EPS file generated successfully.</h2>\n";
                     70:     }
                     71:     print "</body></html>\n";
1.8       matthew    72: } else {
                     73:     die "output $output is not a recognized value or has no value\n";
1.4       matthew    74: }
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