feat: Add CognitoIdp::Token#refresh_token

lib/cognito_idp/token.rb

@@ -2,14 +2,15 @@
 
 module CognitoIdp
   class Token
-    attr_reader :access_token, :id_token, :token_type, :expires_at, :expires_in
+    attr_reader :access_token, :id_token, :token_type, :expires_at, :expires_in, :refresh_token
 
     def initialize(token_hash)
       token_hash.transform_keys(&:to_sym).tap do |values|
         @access_token = values[:access_token]
         @id_token = values[:id_token]
         @token_type = values[:token_type]
         @expires_in = values[:expires_in]
+        @refresh_token = values[:refresh_token]
       end
       @expires_at = Time.now + expires_in unless expires_in.nil?
     end

spec/cognito_idp/token_spec.rb

@@ -14,14 +14,16 @@
   it { expect(token.token_type).to be_nil }
   it { expect(token.expires_in).to be_nil }
   it { expect(token.expires_at).to be_nil }
+  it { expect(token.refresh_token).to be_nil }
 
   context "when token is initialized with values" do
     let(:token_hash) do
       {
         "access_token" => "eyJra1example",
         "id_token" => "eyJra2example",
         "token_type" => "Bearer",
-        "expires_in" => 3600
+        "expires_in" => 3600,
+        "refresh_token" => "refresh-token-1"
       }
     end
 
@@ -38,5 +40,6 @@
     it { expect(token.token_type).to eq("Bearer") }
     it { expect(token.expires_in).to eq(3600) }
     it { expect(token.expires_at).to eq(Time.now + 3600) }
+    it { expect(token.refresh_token).to eq("refresh-token-1") }
   end
 end