Re: Weather Forecast CGI

Re: security-- Okay, I now sanitize the data from the input form. My intention in this CGI was to show how cool Geo::WeatherNOAA is, not to distribute a production quality script. But, for those that care, the more secure code sits below.

Re: HTML templates-- yes, I am a big supporter of separating html from code, but not for quick and dirty scripts to demonstrate something. I use HTML::Template and other tools quite frequently, but for this script I do think that it would be overkill.

cheers

#!/usr/bin/perl

use strict;
use Geo::WeatherNOAA;
use CGI qw(param);

my $OK_CHARS = "-a-zA-Z0-9_.@'\"\s";

foreach (param()) {
    # sanitize data input from form
    if (param($_) =~ /[^$OK_CHARS]/) {
    print "Content-type: text/html\n\n";
    print "<html><head><title>Form Error</title></head><body><b>Warnin
+g:</b> One of the characters in your form entry is not allowed by thi
+s program. Characters that are allowed are A-Za-z0-9.@-\"'. Please hi
+t back on your browser and try again.</body></html>";
    exit(0);
    }
}


my ($city, $state);

if (param("city")) {
    $city = param("city");
} else {
    $city = "Minneapolis";
}

if (param("state")) {
    $state = param("state");
} else {
    $state = "MN";
}


print "Content-type: text/html\n\n";
print <<EOHTML;

<HTML>
<HEAD>
    <TITLE>BenWorld</TITLE>
    <link rel="SHORTCUT ICON" href="/bk.ico">
</HEAD>
<BODY TEXT="#003366" BGCOLOR="#FFFFFF" ALINK="#0000FF" VLINK="#FF232D"
+>
<CENTER>
<IMG SRC="/images/benwlogo.jpg"><br>
<HR>
EOHTML

print "<h3><font color = red>Weather Forecast for</font> $city, $state
+</h3>";
my $html_weather_table = get_weather_data($city,$state);
print $html_weather_table;

print "<hr><p>\n";
print "<form><table>
<tr><td colspan = 2 align = center><b>Get weather for another City/Sta
+te</b></td></tr>
<td align = right><b>City:</b></td>
    <td align = left><input type = text name = city></td></tr>\n";
print "<tr><td align = right><b>State:</b></td>
    <td align = left>";
print_state_select_menu();
print "</td></tr>\n";

print "<tr><td colspan = 2 align = center><input type = submit value =
+ \"Get Forecast\"></td></tr>\n";
print "</table></form>\n";

print "</body></html>\n";

exit;

sub get_weather_data {

   my ($city, $state) = @_;
   my $filename = "weather_cache/${city}_${state}.out";
   my ($return, $time, $mtime, $diff);
   if (-e $filename) {
    $time = time;
    $mtime = (stat("weather_cache/$filename"))[9];
    $diff = $time - $mtime;
   } else {
    $diff = 0;
   }

   if ($diff > 3600 || !$diff) { # file older than an hour or doesn't 
+exist
        
       $return = make_noaa_table($city,$state);
       open(CACHE,">$filename") or warn "couldn't open weather_cache/$
+filename: $!";
       print CACHE $return;
       close(CACHE);
       return $return;

    } else {

       open(CACHE,"<$filename") or warn "couldn't open weather_cache/$
+filename: $!";
       { local $/ = "\0"; $return = <CACHE>; }
           close(CACHE);
           return $return;
    }
       

}


sub print_state_select_menu {

print '<select name="state" >
    <option value=""> -- select one --
    <option value="AL">Alabama
    <option value="AK">Alaska
    <option value="AZ">Arizona
    <option value="AR">Arkansas
    <option value="CA">California
    <option value="CO">Colorado
    <option value="CN">Connecticut
    <option value="DE">Delaware
    <option value="FL">Florida
    <option value="GA">Georgia
    <option value="HA">Hawaii
    <option value="ID">Idaho
    <option value="IL">Illinois
    <option value="IN">Indiana
    <option value="IO">Iowa
    <option value="KA">Kansas
    <option value="KY">Kentucky
    <option value="LA">Louisiana
    <option value="ME">Maine
    <option value="MD">Maryland
    <option value="MA">Massachusetts
    <option value="MI">Michigan
    <option value="MN">Minnesota
    <option value="MS">Mississippi
    <option value="MO">Missouri
    <option value="MT">Montana
    <option value="NE">Nebraska
    <option value="NV">Nevada
    <option value="NH">New Hampshire
    <option value="NJ">New Jersey
    <option value="NM">New Mexico
    <option value="NY">New York
    <option value="NC">North Carolina
    <option value="ND">North Dakota
    <option value="OH">Ohio
    <option value="OK">Oklahoma
    <option value="OR">Oregon
    <option value="PA">Pennsylvania
    <option value="RI">Rhode Island
    <option value="SC">South Carolina
    <option value="SD">South Dakota
    <option value="TN">Tenneessee
    <option value="TX">Texas
    <option value="UT">Utah
    <option value="VT">Vermont
    <option value="VA">Virginia
    <option value="WA">Washington
    <option value="WV">West Virginia
    <option value="WI">Wisconsin
    <option value="WY">Wyoming
</select>';

}
[download]

Comment on Re: Weather Forecast CGI Download Code


Welcome to the Monastery
	PerlMonks