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This chapter covers
� Authenticating against external services
using OmniAuth
� Authenticating with Twitter using OAuth
� Authenticating with GitHub using OAuth
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Alternative
authentication
Now that your application has been deployed to a server somewhere (or at least
you’ve gone through the motions of doing that!), we’re going to look at adding
additional features to your application. One of these is OAuth authentication from
services such as Twitter and GitHub.
When you sign into a website, you can generally use a couple of authentication
methods. The first of these would be a username and password, with the username
being forced to be unique. This method provides a solid way to identify what user
has logged into the website, and from that identification the website can choose to
grant or deny access to specific parts of the site. You have done this with your Ticketee
application, except in place of a username, you’re using an email address. An
email address is an already unique value for users of a website that also allows you