feat: support exchanging OTP codes for tokens (#438)

lib/auth0/api/authentication_endpoints.rb

@@ -13,6 +13,7 @@ module AuthenticationEndpoints
 
       UP_AUTH = 'Username-Password-Authentication'.freeze
       JWT_BEARER = 'urn:ietf:params:oauth:grant-type:jwt-bearer'.freeze
+      GRANT_TYPE_PASSWORDLESS_OPT = 'http://auth0.com/oauth/grant-type/passwordless/otp'.freeze
 
       # Request an API access token using a Client Credentials grant
       # @see https://auth0.com/docs/api-auth/tutorials/client-credentials
@@ -94,6 +95,48 @@ def exchange_refresh_token(
         ::Auth0::AccessToken.from_response request_with_retry(:post, '/oauth/token', request_params)
       end
 
+      # Exchange an OTP recieved through SMS for ID and access tokens
+      # @param phone_number [string] The user's phone number used to receive the OTP
+      # @param otp [string] The OTP contained in the SMS
+      # @param audience [string] The audience for the access token (defaults to nil)
+      # @param scope [string] The scope (defaults to 'openid profile email')
+      def exchange_sms_otp_for_tokens(phone_number, otp, audience: nil, scope: nil)
+        request_params = {
+          grant_type: GRANT_TYPE_PASSWORDLESS_OPT,
+          client_id: @client_id,
+          username: phone_number,
+          otp: otp,
+          realm: 'sms',
+          audience: audience,
+          scope: scope || 'openid profile email'
+        }
+
+        populate_client_assertion_or_secret(request_params)
+
+        ::Auth0::AccessToken.from_response request_with_retry(:post, '/oauth/token', request_params)
+      end
+
+      # Exchange an OTP recieved through email for ID and access tokens
+      # @param email_address [string] The user's email address used to receive the OTP
+      # @param otp [string] The OTP contained in the email
+      # @param audience [string] The audience for the access token (defaults to nil)
+      # @param scope [string] The scope (defaults to 'openid profile email')
+      def exchange_email_otp_for_tokens(email_address, otp, audience: nil, scope: nil)
+        request_params = {
+          grant_type: GRANT_TYPE_PASSWORDLESS_OPT,
+          client_id: @client_id,
+          username: email_address,
+          otp: otp,
+          realm: 'email',
+          audience: audience,
+          scope: scope || 'openid profile email'
+        }
+
+        populate_client_assertion_or_secret(request_params)
+
+        ::Auth0::AccessToken.from_response request_with_retry(:post, '/oauth/token', request_params)
+      end
+
       # rubocop:disable Metrics/ParameterLists
       # Get access and ID tokens using Resource Owner Password.
       # Requires that your tenant has a Default Audience or Default Directory.

spec/lib/auth0/api/authentication_endpoints_spec.rb

@@ -237,6 +237,200 @@
       end
     end
 
+    context 'exchange_sms_otp_for_tokens', focus: true do
+      it 'requests the tokens using an OTP from SMS' do
+        expect(RestClient::Request).to receive(:execute) do |arg|
+          expect(arg).to match(
+            include(
+              method: :post,
+              url: 'https://samples.auth0.com/oauth/token'
+            )
+          )
+
+          payload = JSON.parse arg[:payload], symbolize_names: true
+
+          expect(payload[:grant_type]).to eq 'http://auth0.com/oauth/grant-type/passwordless/otp'
+          expect(payload[:username]).to eq 'phone_number'
+          expect(payload[:realm]).to eq 'sms'
+          expect(payload[:otp]).to eq 'code'
+          expect(payload[:client_id]).to eq client_id
+          expect(payload[:client_secret]).to eq client_secret
+          expect(payload[:scope]).to eq 'openid profile email'
+          expect(payload[:audience]).to be_nil
+
+          StubResponse.new({ 
+            "id_token" => "id_token",
+            "access_token" => "test_access_token", 
+            "expires_in" => 86400}, 
+            true,
+            200)
+        end
+
+        result = client_secret_instance.send :exchange_sms_otp_for_tokens, 'phone_number', 'code'
+
+        expect(result).to be_a_kind_of(Auth0::AccessToken)
+        expect(result.id_token).not_to be_nil
+        expect(result.access_token).not_to be_nil
+        expect(result.expires_in).not_to be_nil
+      end
+
+      it 'requests the tokens using OTP from SMS, and overrides scope and audience' do
+        expect(RestClient::Request).to receive(:execute) do |arg|
+          expect(arg).to match(
+            include(
+              method: :post,
+              url: 'https://samples.auth0.com/oauth/token'
+            )
+          )
+
+          payload = JSON.parse arg[:payload], symbolize_names: true
+
+          expect(payload[:scope]).to eq 'openid'
+          expect(payload[:audience]).to eq api_identifier
+
+          StubResponse.new({ 
+            "id_token" => "id_token",
+            "access_token" => "test_access_token", 
+            "expires_in" => 86400}, 
+            true,
+            200)
+        end
+
+        result = client_secret_instance.send(:exchange_sms_otp_for_tokens, 'phone_number', 'code',
+          audience: api_identifier,
+          scope: 'openid'
+        )
+
+        expect(result).to be_a_kind_of(Auth0::AccessToken)
+        expect(result.id_token).not_to be_nil
+        expect(result.access_token).not_to be_nil
+        expect(result.expires_in).not_to be_nil
+      end
+
+      it 'requests the tokens using an OTP from SMS using client assertion' do
+        expect(RestClient::Request).to receive(:execute) do |arg|
+          expect(arg).to match(
+            include(
+              method: :post,
+              url: 'https://samples.auth0.com/oauth/token'
+            )
+          )
+
+          payload = JSON.parse arg[:payload], symbolize_names: true
+
+          expect(payload[:grant_type]).to eq 'http://auth0.com/oauth/grant-type/passwordless/otp'
+          expect(payload[:client_secret]).to be_nil
+          expect(payload[:client_assertion]).not_to be_nil
+          expect(payload[:client_assertion_type]).to eq Auth0::ClientAssertion::CLIENT_ASSERTION_TYPE
+
+          StubResponse.new({ 
+            "id_token" => "id_token",
+            "access_token" => "test_access_token", 
+            "expires_in" => 86400}, 
+            true,
+            200)
+        end
+
+        client_assertion_instance.send :exchange_sms_otp_for_tokens, 'phone_number', 'code'
+      end
+    end
+
+    context 'exchange_email_otp_for_tokens', focus: true do
+      it 'requests the tokens using email OTP' do
+        expect(RestClient::Request).to receive(:execute) do |arg|
+          expect(arg).to match(
+            include(
+              method: :post,
+              url: 'https://samples.auth0.com/oauth/token'
+            )
+          )
+
+          payload = JSON.parse arg[:payload], symbolize_names: true
+
+          expect(payload[:grant_type]).to eq 'http://auth0.com/oauth/grant-type/passwordless/otp'
+          expect(payload[:username]).to eq 'email_address'
+          expect(payload[:realm]).to eq 'email'
+          expect(payload[:otp]).to eq 'code'
+          expect(payload[:client_id]).to eq client_id
+          expect(payload[:client_secret]).to eq client_secret
+          expect(payload[:scope]).to eq 'openid profile email'
+          expect(payload[:audience]).to be_nil
+
+          StubResponse.new({ 
+            "id_token" => "id_token",
+            "access_token" => "test_access_token", 
+            "expires_in" => 86400}, 
+            true,
+            200)
+        end
+
+        result = client_secret_instance.send :exchange_email_otp_for_tokens, 'email_address', 'code'
+
+        expect(result).to be_a_kind_of(Auth0::AccessToken)
+        expect(result.id_token).not_to be_nil
+        expect(result.access_token).not_to be_nil
+        expect(result.expires_in).not_to be_nil
+      end
+
+      it 'requests the tokens using OTP from email, and overrides scope and audience' do
+        expect(RestClient::Request).to receive(:execute) do |arg|
+          expect(arg).to match(
+            include(
+              method: :post,
+              url: 'https://samples.auth0.com/oauth/token'
+            )
+          )
+
+          payload = JSON.parse arg[:payload], symbolize_names: true
+
+          expect(payload[:scope]).to eq 'openid'
+          expect(payload[:audience]).to eq api_identifier
+
+          StubResponse.new({ 
+            "id_token" => "id_token",
+            "access_token" => "test_access_token", 
+            "expires_in" => 86400}, 
+            true,
+            200)
+        end
+
+        client_secret_instance.send(:exchange_email_otp_for_tokens, 'email_address', 'code',
+          audience: api_identifier,
+          scope: 'openid'
+        )
+      end
+
+      it 'requests the tokens using OTP from email using client assertion' do
+        expect(RestClient::Request).to receive(:execute) do |arg|
+          expect(arg).to match(
+            include(
+              method: :post,
+              url: 'https://samples.auth0.com/oauth/token'
+            )
+          )
+
+          payload = JSON.parse arg[:payload], symbolize_names: true
+
+          expect(payload[:grant_type]).to eq 'http://auth0.com/oauth/grant-type/passwordless/otp'
+          expect(payload[:client_secret]).to be_nil
+          expect(payload[:client_assertion]).not_to be_nil
+          expect(payload[:client_assertion_type]).to eq Auth0::ClientAssertion::CLIENT_ASSERTION_TYPE
+
+          StubResponse.new({ 
+            "id_token" => "id_token",
+            "access_token" => "test_access_token", 
+            "expires_in" => 86400}, 
+            true,
+            200)
+        end
+
+        client_assertion_instance.send(:exchange_email_otp_for_tokens, 'email_address', 'code',
+          audience: api_identifier,
+          scope: 'openid'
+        )
+      end
+    end
+
     context 'login_with_resource_owner' do
       it 'logs in using a client secret' do
         expect(RestClient::Request).to receive(:execute) do |arg|

spec/lib/auth0/api/v2/clients_spec.rb

@@ -141,7 +141,7 @@
     it { expect { @instance.client_credential('1', '') }.to raise_error 'Must specify a credential id' }
   end
 
-  context '.delete_client_credential', focus: true do
+  context '.delete_client_credential' do
     it { expect(@instance).to respond_to(:delete_client_credential) }
 
     it 'is expected to delete /api/v2/clients/1/credentials/2' do