Beispiel #1
0
//Invoke Transaction makes increment counter
func (t *AuthorizableCounterChaincode) Invoke(stub *shim.ChaincodeStub, function string, args []string) ([]byte, error) {
	if function != "increment" {
		return nil, errors.New("Invalid invoke function name. Expecting \"increment\"")
	}
	val, err := stub.ReadCertAttribute("position")
	fmt.Printf("Position => %v error %v \n", string(val), err)
	isOk, _ := stub.VerifyAttribute("position", []byte("Software Engineer")) // Here the ABAC API is called to verify the attribute, just if the value is verified the counter will be incremented.
	if isOk {
		counter, err := stub.GetState("counter")
		if err != nil {
			return nil, err
		}
		var cInt int
		cInt, err = strconv.Atoi(string(counter))
		if err != nil {
			return nil, err
		}
		cInt = cInt + 1
		counter = []byte(strconv.Itoa(cInt))
		stub.PutState("counter", counter)
	}
	return nil, nil

}
Beispiel #2
0
// isAuthorized checks if the transaction invoker has the appropriate role
// stub: chaincodestub
// requiredRole: required role; this function will return true if invoker has this role
func (t *certHandler) isAuthorized(stub *shim.ChaincodeStub, requiredRole string) (bool, error) {
	//read transaction invoker's role, and verify that is the same as the required role passed in
	return stub.VerifyAttribute(role, []byte(requiredRole))
}