Allows OmniAuth to authenticate against a Discourse forum.

On your Discourse forum, go into the Admin Settings, check "enable sso provider" and generate a strong secret for "sso secret".

In your Rails app:

Add the following line to your Gemfile:

gem 'omniauth-discourse'

Then add the following line to your OmniAuth initializer:

provider :discourse,
  sso_url: "https://forum.example.com/session/sso_provider",
  sso_secret: Rails.application.secrets.sso_secret

Make sure you set the URL to point to your forum, and the secret to the secret generated earlier.

That's it!

The following information about each user will be available in the OmniAuth authhash:

uid do
  user_info[:external_id]
end

info do
  {
    "name" => user_info[:name],
    "email" => user_info[:email],
    "nickname" => user_info[:username]
  }
end

extra do
  {
    "admin" => user_info[:admin] == "true",
    "moderator" => user_info[:moderator] == "true"
  }
end