/*
Copyright IBM Corp. 2017 All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

                 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package cid

import "crypto/x509"

// ChaincodeStubInterface is used by deployable chaincode apps to get identity
// of the  agent (or user) submitting the transaction.
type ChaincodeStubInterface interface {
	// GetCreator returns `SignatureHeader.Creator` (e.g. an identity)
	// of the `SignedProposal`. This is the identity of the agent (or user)
	// submitting the transaction.
	GetCreator() ([]byte, error)
}

// ClientIdentity represents information about the identity that submitted the
// transaction
type ClientIdentity interface {

	// GetID returns the ID associated with the invoking identity.  This ID
	// is guaranteed to be unique within the MSP.
	GetID() (string, error)

	// Return the MSP ID of the client
	GetMSPID() (string, error)

	// GetAttributeValue returns the value of the client's attribute named `attrName`.
	// If the client possesses the attribute, `found` is true and `value` equals the
	// value of the attribute.
	// If the client does not possess the attribute, `found` is false and `value`
	// equals "".
	GetAttributeValue(attrName string) (value string, found bool, err error)

	// AssertAttributeValue verifies that the client has the attribute named `attrName`
	// with a value of `attrValue`; otherwise, an error is returned.
	AssertAttributeValue(attrName, attrValue string) error

	// GetX509Certificate returns the X509 certificate associated with the client,
	// or nil if it was not identified by an X509 certificate.
	GetX509Certificate() (*x509.Certificate, error)
}