Adding default scopes

README.md

@@ -20,7 +20,7 @@ Example:
 
 ```ruby
 Rails.application.config.middleware.use OmniAuth::Builder do
-  provider :mastodon, credentials: lambda { |domain, callback_url|
+  provider :mastodon, scope: 'read write follow', credentials: lambda { |domain, callback_url|
     Rails.logger.info "Requested credentials for #{domain} with callback URL #{callback_url}"
 
     existing = MastodonClient.find_by(domain: domain)

lib/omniauth/mastodon/version.rb

@@ -12,7 +12,7 @@ module OmniAuth
       end
 
       def patch
-        0
+        1
       end
 
       def pre

lib/omniauth/strategies/mastodon.rb

@@ -3,10 +3,13 @@ require 'omniauth-oauth2'
 module OmniAuth
   module Strategies
     class Mastodon < OmniAuth::Strategies::OAuth2
+      DEFAULT_SCOPE = 'read'.freeze
+
       option :name, 'mastodon'
 
       option :credentials
       option :identifier
+      option :authorize_options, [:scope]
 
       option :client_options, {
         authorize_url: '/oauth/authorize',
@@ -47,6 +50,12 @@ module OmniAuth
         full_host + script_name + callback_path
       end
 
+      def authorize_params
+        super.tap do |params|
+          params[:scope] ||= DEFAULT_SCOPE
+        end
+      end
+
       private
 
       def get_identifier