//VerifyAttribute is used to verify if the transaction certificate has an attribute with name *attributeName* and value *attributeValue* which are the input parameters received by this function.
//Example:
// containsAttr, error := stub.VerifyAttribute("position", "Software Engineer")
func (stub *ChaincodeStub) VerifyAttribute(attributeName string, attributeValue []byte) (bool, error) {
attributesHandler, err := attr.NewAttributesHandlerImpl(stub)
if err != nil {
return false, err
}
return attributesHandler.VerifyAttribute(attributeName, attributeValue)
}
//VerifyAttributes does the same as VerifyAttribute but it checks for a list of attributes and their respective values instead of a single attribute/value pair
// Example:
// containsAttrs, error:= stub.VerifyAttributes(&attr.Attribute{"position", "Software Engineer"}, &attr.Attribute{"company", "ACompany"})
func (stub *ChaincodeStub) VerifyAttributes(attrs ...*attr.Attribute) (bool, error) {
attributesHandler, err := attr.NewAttributesHandlerImpl(stub)
if err != nil {
return false, err
}
return attributesHandler.VerifyAttributes(attrs...)
}
//ReadCertAttribute is used to read an specific attribute from the transaction certificate, *attributeName* is passed as input parameter to this function.
// Example:
// attrValue,error:=stub.ReadCertAttribute("position")
func (stub *ChaincodeStub) ReadCertAttribute(attributeName string) ([]byte, error) {
attributesHandler, err := attr.NewAttributesHandlerImpl(stub)
if err != nil {
return nil, err
}
return attributesHandler.GetValue(attributeName)
}
func (t *Attributes2State) setStateToAttributes(stub shim.ChaincodeStubInterface, args []string) error {
attrHandler, err := attr.NewAttributesHandlerImpl(stub)
if err != nil {
return err
}
for _, att := range args {
fmt.Println("Writing attribute " + att)
attVal, err := attrHandler.GetValue(att)
if err != nil {
return err
}
err = stub.PutState(att, attVal)
if err != nil {
return err
}
}
return nil
}