Re: How can I have a Dancer2 before hook return an HTTP error?

Hi,

First of all, as you may know, you don't need to code anything to get a 404 error response for a path that does not exist.

use strict;
use warnings;

use Dancer2;

get '/' => sub {
    return 'Hello, world';
};

dance;
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$ curl localhost:3000/does_not_exist
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0
+, user-scalable=yes">
  <title>Error 404 - Not Found</title>
  <link rel="stylesheet" href="http://localhost:3000/css/error.css">
</head>
<body>
<h1>Error 404 - Not Found</h1>
<div id="content">
/does_not_exist
</div>
<div id="footer">
Powered by <a href="http://perldancer.org/">Dancer2</a> 1.1.2
</div>
</body>
</html>
[download]

To return an error page based on something like an ID that is not allowed, use send_error:

use strict;
use warnings;

use Dancer2;

get '/hello/:name' => sub {
    my $name = route_parameters->get('name');
    return "Hello, $name";
};

hook before => sub {
    my $name = route_parameters->get('name');
    is_disallowed($name) and send_error("$name is disallowed", 401);
};

sub is_disallowed {
    my $name = shift;
    return $name eq 'nick' ? 1 : 0;
}

dance;
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$ curl localhost:3000/hello/lembark
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Hello, lembark
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$ curl localhost:3000/hello/nick
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0
+, user-scalable=yes">
  <title>Error 401 - Unauthorized</title>
  <link rel="stylesheet" href="http://localhost:3000/css/error.css">
</head>
<body>
<h1>Error 401 - Unauthorized</h1>
<div id="content">
nick is disallowed
</div>
<div id="footer">
Powered by <a href="http://perldancer.org/">Dancer2</a> 1.1.2
</div>
</body>
</html>
[download]

See the documentation.

Hope this helps

update: included the before hook, d'oh

The way forward always starts with a minimal test.

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