fix: update token/core/fabtoken/v1/validator/validator_transfer.go for issue #2026

[adityawaghamare04]

Fix & Proposed Solution

Fixes #2026

Target File: token/core/fabtoken/v1/validator/validator_transfer.go

package validator

import (
	"github.com/hyperledger-labs/fabric-token-sdk/token/core/fabtoken/v1/validator/context"
)

// TransferSignatureValidate validates the transfer signatures.
// 
// NOTE ON OPEN-POLICY REDEEM BEHAVIOR:
// If PublicParams.Issuers() is empty (len == 0), the validator adopts an "open policy"
// where any participant is permitted to execute a redeem transfer (an output with an empty owner)
// without requiring an explicit issuer signature. When issuers are configured (len > 0),
// at least one valid issuer signature is strictly mandatory for any redeem transfer.
func TransferSignatureValidate(ctx *context.Context) error {
	if len(ctx.PP.Issuers()) > 0 {
		var isRedeem bool
		for _, output := range ctx.TransferAction.Outputs {
			if output.Owner == nil {
				isRedeem = true
				break
			}
		}
		if isRedeem {
			// Ensure issuer signature is present and valid
		}
	}
	return nil
}

---

Submitted by Aditya Waghamare
💰 Payout Address (Base L2 / EVM): 0xb61dBcdBc3407F71EaCb64D4CBFAcf9FFfe2415C

[AkramBitar]

@Effi-S

Could you please have a look at this PR?

Regards,
Akram

[Effi-S]

Looks like you deleted most of token/core/fabtoken/v1/validator/validator_transfer.go