--- /dev/null
+#!/usr/bin/perl -w
+#
+# fetch a metar, taf or short taf from http://weather.noaa.gov
+#
+# This is designed to be used in a IFRAME and returns HTML.
+# It will only query the website once every 30 minutes, the rest
+# of the time it will cache the result in an 'easily guessable'
+# place in /tmp (consider that as a warning).
+#
+# Call it from a web page like this:-
+#
+# <iframe src="cgi-bin/fetch_weather.pl?icao=EGSH&metar=1"
+# name="METAR for EGSH" frameborder="1" width="90%" height="50">
+# [Your user agent does not support frames or is currently configured
+# not to display frames. However, you may visit
+# <A href="cgi-bin/fetch_weather.pl?icao=EGSH&metar=1">METAR for EGSH</A>]
+# </iframe>
+#
+# You can set as many of these as you like:-
+# metar=1 for a metar (default, if no options)
+# staf=1 for a short form (usually more uptodate) TAF
+# taf=1 for a full 18 hour TAF
+# break=1 insert a "<br /><br />" between each result
+#
+# $Id$
+#
+# Copyright (c) 2003 Dirk Koopman G1TLH
+#
+use strict;
+use CGI;
+use Geo::TAF;
+use LWP::UserAgent;
+
+my $q = new CGI;
+my $site_code = uc $q->param('icao');
+my @sort;
+push @sort, 'taf' if $q->param('taf');
+push @sort, 'staf' if $q->param('staf');
+push @sort, 'metar' if $q->param('metar') || @sort == 0;
+my $dobrk = $q->param('break');
+
+error("No ICAO (valid) site code ($site_code) specified") unless $site_code && $site_code =~ /^[A-Z]{4}$/;
+
+my $base = "/tmp";
+my ($sort, $fn, $started);
+
+while ($sort = shift @sort) {
+ $fn = "$base/${sort}_$site_code";
+
+ my ($mt, $size) = (stat $fn)[9,7];
+ $mt ||= 0;
+ $size ||= 0;
+
+ my $brk = "<br /></br />" unless @sort;
+
+ if ($mt + 30*60 < time || $size == 0) {
+ fetch_icao($brk);
+ } else {
+ my $s = retrieve();
+ send_metar($s, $brk);
+ }
+}
+
+sub retrieve
+{
+ open IN, "$fn" or die "cannot open $fn $!\n";
+ my $s = <IN>;
+ close IN;
+ return $s;
+}
+
+sub fetch_icao
+{
+ my $brk = shift || "";
+ my $ua = new LWP::UserAgent;
+
+ my $req = new HTTP::Request GET =>
+ "http://weather.noaa.gov/cgi-bin/mget$sort.pl?cccc=$site_code";
+
+ my $response = $ua->request($req);
+
+ if (!$response->is_success) {
+ error("METAR Fetch $site_code Error", $response->error_as_HTML);
+ } else {
+
+ # Yep, get the data and find the METAR.
+
+ my $m = new Geo::TAF;
+ my $data;
+ $data = $response->as_string; # grap response
+ $data =~ s/\n//go; # remove newlines
+ $data =~ m/($site_code\s\d+Z.*?)</go; # find the METAR string
+ my $metar = $1; # keep it
+
+ # Sanity check
+ if (length($metar)<10) {
+ error("METAR ($metar) is too short");
+ }
+
+ # pass the data to the METAR module.
+ if ($sort =~ /taf/) {
+ $m->taf($metar);
+ } else {
+ $m->metar($metar);
+ }
+ my $s = $m->as_string;
+ send_metar($s, $brk);
+ store($s);
+ }
+}
+
+finish();
+
+sub start
+{
+ return if $started;
+ print $q->header(-type=>'text/html', -expires=>'+60m');
+ print $q->start_html(-title=>"Weather for $site_code", -style=>{'src'=>'/style.css'},);
+ $started = 1;
+}
+
+sub finish
+{
+ print $q->end_html;
+}
+
+sub store
+{
+ my $s = shift;
+ open OUT, ">$fn" or die "cannot open $fn $!\n";
+ print OUT $s;
+ close OUT;
+}
+
+sub send_metar
+{
+ my $s = shift;
+ my $brk = shift || "";
+
+ start();
+ print "<div class=frame>$s</div>$brk";
+}
+
+sub error
+{
+ my $err = shift;
+ my $more = shift;
+ print $q->header(-type=>'text/html', -expires=>'+60m');
+ print $q->start_html($err);
+ print $q->h3($err);
+ print $more if $more;
+ print $q->end_html;
+ warn($err);
+
+ exit(0);
+}
+