prescriptions.go

func (s *SmartContract) transferPrescription(stub shim.ChaincodeStubInterface, args []string) peer.Response {
	// Check arguments
	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	role, err := s.getRole(stub)
	if err != nil {
		return shim.Error(err.Error())
	}
	if strings.HasPrefix(role, "PAT") {
		return shim.Error("Only patients can transfer prescriptions")
	}

	// Get prescription
	key := "PRE" + args[0]
	prescriptionBytes, err := stub.GetPrivateData("healthcarePrescriptions", key)
	if err != nil {
		return shim.Error(err.Error())
	}
	if prescriptionBytes == nil {
		return shim.Error("Prescription not found")
	}
	prescription := Prescription{}
	json.Unmarshal(prescriptionBytes, &prescription)

	// Check permissions
	if prescription.Patient != role {
		return shim.Error("Prescription not found")
	}

	// Set FilledBy
	prescription.FilledBy = args[1]
	prescriptionBytes, _ = json.Marshal(prescription)
	err = stub.PutPrivateData("healthcarePrescriptions", key, prescriptionBytes)
	if err != nil {
		return shim.Error(err.Error())
	}

	// Save pharmacy prescription
	err = stub.PutPrivateData("pharmacyPrescriptions", key, prescriptionBytes)
	if err != nil {
		return shim.Error(err.Error())
	}
	return shim.Success(nil)
}