Serving Files with Dancer::Plugin::DirectoryView and Dancer::Plugin::Auth::Htpasswd

A while ago I was converting a simple PHP website to Dancer, and moving it from being deployed on Apache to Starman. There wasn't a lot of code, so rewriting went quickly -- but, the site used a few specific features of Apache, namely directory indexes (courtesy of mod_autoindex) to allow user access to directories/files on the server, and htpasswd files to password-protect some of those directories.

I could just deploy the new Dancer website on Apache and keep using those goodies, but I thought that it would be nice if Dancer itself provided similar features. So, I created two plugins that do just that: Dancer::Plugin::DirectoryView and Dancer::Plugin::Auth::Htpasswd. Let me now show you how to use them.

Directory Indexes

Let's say we have a files directory under public, and we'd like to allow users to browse it and download files. Enabling directory access is as simple as including the plugin in our Dancer application:

package MyWebApp;

...

use Dancer::Plugin::DirectoryView;

And updating the configuration file (config.yml) to tell the plugin which directory should be made available, and at which URL:

plugins:
    DirectoryView:
        url: /pub
        root_dir: files

That's it -- now, if we launch our app and point the browser at the /pub URL, we'll see the contents of the directory:

Protecting Directories with Htpasswd Files

As you might have noticed on the screenshot, there's a secret directory under files. It contains some super secret data that should only be available to authorized users, so now we're going to protect it using a htpasswd file.

First, let's create the htpasswd file and an user, named "alice":

$ htpasswd -c htpasswd alice

Once it is created, we need to put the htpasswd file in a safe location outside of the public directory, so let's create a new directory passwd and store the file in there.

(If you're migrating from Apache and already have the htpasswd file, you just need to copy it to your Dancer application.)

In our Dancer application, we include the Auth::Htpasswd plugin:

package MyWebApp;

...

use Dancer::Plugin::Auth::Htpasswd;

Now, we need to update our configuration file and add settings for the plugin. We'll tell it to protect the /pub/secret path, and to use the htpasswd file we just created:

plugins:
   "Auth::Htpasswd":
       paths:
           "/pub/secret":
               realm: "Secret Files"
               passwd_file: passwd/htpasswd

The realm parameter lets us set the text that will be shown to the user in the login window displayed by the browser.

Let's see if our protection works. We restart the application and try to access the /pub/secret/ URL:

Great, our confidential files are safe. Only when we log in as "Alice", we'll be able to access them:

AUTHOR

Michal Wojciechowski, <odyniec@odyniec.net>

blog comments powered by Disqus