Fix chaincode client identity resolution for mint and transfer.

Use a shared getClientID helper so SolaceNet capability checks and transfer authorization handle identity errors consistently.

Co-authored-by: Cursor <cursoragent@cursor.com>

chaincode/tokenized-asset/go/tokenized_asset.go

@@ -114,13 +114,16 @@ func (s *TokenizedAssetContract) MintToken(ctx contractapi.TransactionContextInt
 
 	// Check SolaceNet capability (would integrate with SolaceNet service)
 	// This is a placeholder - in production, call SolaceNet API
-	clientID := ctx.GetClientIdentity()
-	canMint, err := s.checkSolaceNetCapability(ctx, clientID.GetID(), "tokenization.mint")
+	callerID, err := getClientID(ctx)
+	if err != nil {
+		return err
+	}
+	canMint, err := s.checkSolaceNetCapability(ctx, callerID, "tokenization.mint")
 	if err != nil {
 		return fmt.Errorf("failed to check SolaceNet capability: %v", err)
 	}
 	if !canMint {
-		return fmt.Errorf("client %s does not have tokenization.mint capability", clientID.GetID())
+		return fmt.Errorf("client %s does not have tokenization.mint capability", callerID)
 	}
 
 	// Create tokenized asset
@@ -181,18 +184,21 @@ func (s *TokenizedAssetContract) TransferToken(ctx contractapi.TransactionContex
 	}
 
 	// Verify sender has permission
-	clientID := ctx.GetClientIdentity()
-	if asset.Issuer != clientID.GetID() && request.From != clientID.GetID() {
-		return fmt.Errorf("client %s is not authorized to transfer this token", clientID.GetID())
+	callerID, err := getClientID(ctx)
+	if err != nil {
+		return err
+	}
+	if asset.Issuer != callerID && request.From != callerID {
+		return fmt.Errorf("client %s is not authorized to transfer this token", callerID)
 	}
 
 	// Check SolaceNet capability
-	canTransfer, err := s.checkSolaceNetCapability(ctx, clientID.GetID(), "tokenization.transfer")
+	canTransfer, err := s.checkSolaceNetCapability(ctx, callerID, "tokenization.transfer")
 	if err != nil {
 		return fmt.Errorf("failed to check SolaceNet capability: %v", err)
 	}
 	if !canTransfer {
-		return fmt.Errorf("client %s does not have tokenization.transfer capability", clientID.GetID())
+		return fmt.Errorf("client %s does not have tokenization.transfer capability", callerID)
 	}
 
 	// Verify amounts (simplified - in production, use proper decimal handling)
@@ -271,13 +277,16 @@ func (s *TokenizedAssetContract) RedeemToken(ctx contractapi.TransactionContextI
 	}
 
 	// Check SolaceNet capability
-	clientID := ctx.GetClientIdentity()
-	canRedeem, err := s.checkSolaceNetCapability(ctx, clientID.GetID(), "tokenization.redeem")
+	callerID, err := getClientID(ctx)
+	if err != nil {
+		return err
+	}
+	canRedeem, err := s.checkSolaceNetCapability(ctx, callerID, "tokenization.redeem")
 	if err != nil {
 		return fmt.Errorf("failed to check SolaceNet capability: %v", err)
 	}
 	if !canRedeem {
-		return fmt.Errorf("client %s does not have tokenization.redeem capability", clientID.GetID())
+		return fmt.Errorf("client %s does not have tokenization.redeem capability", callerID)
 	}
 
 	// Verify amounts
@@ -367,17 +376,27 @@ func (s *TokenizedAssetContract) GetAllTokens(ctx contractapi.TransactionContext
 	return assets, nil
 }
 
+// getClientID returns the submitting client's MSP identity ID.
+func getClientID(ctx contractapi.TransactionContextInterface) (string, error) {
+	id, err := ctx.GetClientIdentity().GetID()
+	if err != nil {
+		return "", fmt.Errorf("failed to get client identity: %v", err)
+	}
+	return id, nil
+}
+
 // checkSolaceNetCapability checks if a client has a SolaceNet capability
 // In production, this would call SolaceNet API or use chaincode-to-chaincode invocation
 func (s *TokenizedAssetContract) checkSolaceNetCapability(ctx contractapi.TransactionContextInterface, clientID, capability string) (bool, error) {
-	// Placeholder implementation
+	// Placeholder implementation — parameters reserved for SolaceNet integration.
+	_ = ctx
+	_ = clientID
+	_ = capability
+
 	// In production, this would:
 	// 1. Call SolaceNet API via external service
 	// 2. Or use chaincode-to-chaincode invocation if SolaceNet is on same network
 	// 3. Or use Cacti to bridge to SolaceNet service
-	
-	// For now, return true for testing
-	// In production, implement actual SolaceNet integration
 	return true, nil
 }