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Gideon Israel Dsouza

NAME

Dancer::Plugin::Auth::Github - Authenticate with Github

SYNOPSIS

    package YourDancerApplication;

    use Dancer ':syntax';
    use Dancer::Plugin::Auth::Github;

    #You must use a session backend. 
    #You should be able to use any backend support by dancer.
    set 'session'      => 'Simple';
    
    #make sure you call this first.
    #initializes the config
    auth_github_init();

    hook before => sub {
        #we don't want to be in a redirect loop
        return if request->path =~ m{/auth/github/callback};
        if (not session('github_user')) {
            redirect auth_github_authenticate_url;
        }
    };

    #by default success will redirect to this route
    get '/' => sub {
        "Hello, ".session('github_user')->{'login'};
        #For all the github_user properties
        #look at http://developer.github.com/v3/users/
        #See the Response for "Get the authenticated user"
    };

    #additionally the plugin adds session('github_access_token')
    #so you can use it if you're doing other things with GitHub Api.

    #by default authentication failure will redirect to this route
    get '/auth/github/failed' => sub { return "Github authentication Failed" };

    ...

CONCEPT

This plugin helps you setup authentication with github OAuth api in your dancer application. It has a helper method that returns the URL you must redirect to for authentication with github, it then defines a callback that handles the rest and if the user was authenticated, his/her info is stored in a session object session('github_user'). The plugin also adds session('github_access_token) if you're doing anything else with github api.

PREREQUESITES

In order for this plugin to work, you need the following:

  • Github application

    You must register your github application here https://github.com/settings/applications/new. You also need to set the callback url in your application settings to yourdomain.com/auth/github/callback. Note, for testing purposes GitHub allows you to use http://127.0.0.1:3000 as your application url.

  • Configuration

    The plugin needs to be configured with your client_id and client_secret (provided by Github once you register your application).

    Set this in your Dancer's configuration under plugins/Auth::Github:

        # config.yml
        ...
            plugins:
              "Auth::Github":
                client_id: "abcde"
                client_secret: "abcde"
                scope: ""
                github_auth_failed: "/fail"
                github_auth_success: "/"

    There is an optional scope, which can be one of the scopes here . Don't include scope if you just need the authenticated user .github_auth_success and github_auth_failed are optional and default to '/' and '/auth/github/failed', respectively.

  • Session backend

    You need to setup a session backend in your dancer application for everything to work. This plugin stores the authenticated user in a session with the name github_user

    You should be able to use any session backend, see Dancer::Session for details about various Dancer session backends, or http://search.cpan.org/search?query=Dancer-Session.

EXPORT

The plugin exports the following symbols to your application's namespace:

auth_github_init

This function should be called before all your route handlers. It loads up the configuration from your config.yml

auth_github_authenticate_url

This function returns an URL that is used to authenticate with github You could put it in a hook like this:

     hook 'before' => sub {
        # we don't want a redirect loop here
        #Github will call /auth/github/callback once the user is authenticated
        return if request->path =~ m{/auth/github/callback};
    
        if (not session('github_user')) {
            redirect auth_github_authenticate_url();
        }
    };

(See this page for more on before hooks)

ROUTE HANDLERS

The plugin defines the following route handler automatically

/auth/github/callback

When a user authenticates on Github, Github redirects back to this url. (Note: You must set the callback url to this one). The route handler will save the access token and then retrieve the authenticated user's information in the session.

If the authentication succeeded, then the plugin will redirect to url setup in the config : github_auth_success, if it failed, then the user is redirected to github_auth_fail. By default github_auth_success = / and github_auth_fail = "/auth/github/failed"

When the authentication succeeds two session objects are created. session('github_user') . For all the github_user properties see this page. session('github_access_token') is also created, if you need to do other things with the api.

AUTHOR

Gideon Israel Dsouza, <gideon at cpan.org>, http://www.gideondsouza.com

BUGS

Please report any bugs or feature requests to bug-dancer-plugin-auth-github at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Dancer-Plugin-Auth-Github. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Dancer::Plugin::Auth::Github

You can also look for information at:

ACKNOWLEDGEMENTS

This project is more or less a port of Dancer::Plugin::Auth::Twitter written by Alexis Sukrieh which itself is a port of Catalyst::Authentication::Credential::Twitter written by Jesse Stay.

LICENSE AND COPYRIGHT

Copyright 2013 Gideon Israel Dsouza.

This project is open source here on github.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.

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