intent data validators support

intentv1/intent_data_ext.go

@@ -0,0 +1,14 @@
+package intents
+
+import "fmt"
+
+func (id *IntentDataOpenSession) IsValid() error {
+	if id.SessionId == "" {
+		return fmt.Errorf("session id is empty")
+	}
+
+	if id.IdToken == nil && id.Email == nil {
+		return fmt.Errorf("idToken and email are both nil")
+	}
+	return nil
+}

intentv1/intent_ext.go

@@ -25,6 +25,10 @@ const (
 	KeyTypeUnknown
 )
 
+type IntentDataValidator interface {
+	IsValid() error
+}
+
 func (intent *Intent) Hash() ([]byte, error) {
 	// copy intent and remove signatures
 	var intentCopy = *intent

intentv1/intent_typed.go

@@ -85,6 +85,23 @@ func NewIntentTypedFromIntent[T any](intent *Intent) (*IntentTyped[T], error) {
 	}
 }
 
+func (i *IntentTyped[T]) IsValid() error {
+	// check if the intent is valid
+	if err := i.Intent.IsValid(); err != nil {
+		return err
+	}
+
+	// check if the intent data is valid
+	var data any = &i.Data
+	if validator, ok := data.(IntentDataValidator); ok {
+		if err := validator.IsValid(); err != nil {
+			return fmt.Errorf("invalid intent data: %w", err)
+		}
+	}
+	// the intent is valid
+	return nil
+}
+
 func (i *IntentTyped[T]) AsIntent() *Intent {
 	i.Intent.Data = i.Data
 	return &i.Intent

intentv1/intent_typed_test.go

@@ -6,6 +6,7 @@ import (
 	"crypto/rand"
 	"testing"
 
+	"github.com/0xsequence/ethkit"
 	"github.com/0xsequence/ethkit/ethwallet"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -185,3 +186,31 @@ func TestIntentIsValid(t *testing.T) {
 		assert.ErrorContains(t, intent.IsValid(), "invalid signature")
 	})
 }
+
+func TestIntentDataValidator(t *testing.T) {
+	t.Run("valid", func(t *testing.T) {
+		intent := NewIntentTyped(IntentDataOpenSession{SessionId: "0x1234", Email: ethkit.ToPtr("[email protected]")})
+
+		wallet, err := ethwallet.NewWalletFromRandomEntropy()
+		require.NoError(t, err)
+
+		session := NewSessionP256K1(wallet)
+		err = session.Sign(intent.AsIntent())
+		require.NoError(t, err)
+
+		assert.NoError(t, intent.IsValid())
+	})
+
+	t.Run("invalid", func(t *testing.T) {
+		intent := NewIntentTyped(IntentDataOpenSession{SessionId: "0x1234"})
+
+		wallet, err := ethwallet.NewWalletFromRandomEntropy()
+		require.NoError(t, err)
+
+		session := NewSessionP256K1(wallet)
+		err = session.Sign(intent.AsIntent())
+		require.NoError(t, err)
+
+		assert.ErrorContains(t, intent.IsValid(), "invalid intent data")
+	})
+}