Your controller needs to implement callbacks to deal with Ueberauth.Auth and Ueberauth.Failure responses.
For an example implementation see the Überauth Example application.
Calling
Depending on the configured url you can initiate the request through:
/auth/google
Or with options:
/auth/google?scope=email%20profile
By default the requested scope is "email". Scope can be configured either explicitly as a scope query value on the request path or in your configuration:
You can also pass options such as the hd parameter to suggest a particular Google Apps hosted domain (caution, can still be overridden by the user), prompt and access_type options to request refresh_tokens and offline access (both have to be present), or include_granted_scopes parameter to allow incremental authorization.
This may also be set via runtime configuration by passing a 2 or 3 argument tuple. To use this feature, the first argument must be the atom :system, and the second argument must represent the environment variable containing the endpoint url.
A third argument may be passed representing a default value if the environment variable is not found, otherwise the library default will be used.
To guard against client-side request modification, it's important to still check the domain in info.urls[:website] within the Ueberauth.Auth struct if you want to limit sign-in to a specific domain.
Copyright and License
Copyright (c) 2015 Sean Callan
Released under the MIT License, which can be found in the repository in LICENSE.
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