// SecretItemDiff represents a secret that has been diffed between nodeagent and proxy
type SecretItemDiff struct {
	Agent string `json:"agent"`
	Proxy string `json:"proxy"`
	SecretItem
}

// SecretItem is an intermediate representation of secrets, used to provide a common
// format between the envoy proxy secrets and node agent output which can be diffed
type SecretItem struct {
	Name        string `json:"resource_name"`

			fmt.Fprintf(w, "%v\t%v\t%v\t%v\t%v\t%v\t%v\n",
				secret.Identity, valueOrNA(""), secret.State, false, valueOrNA(""), valueOrNA(""), valueOrNA(""))
		} else {
			for i, ca := range secret.CertChain {
				t := "Intermediate"
				if i == 0 {
					t = "Leaf"
				} else if i == len(secret.CertChain)-1 {
					t = "Root"
				}
				n := new(big.Int)
				n, _ = n.SetString(ca.SerialNumber, 10)

# Istio Agent

This document describes the internal architecture of Istio agent.

## High Level overview

![High Level overview](docs/overview.svg)

At a high level, the Istio agent acts as an intermediate proxy between Istiod and Envoy. This is done
at two levels. For distributing workload certificates, Envoy will send [SDS](https://www.envoyproxy.io/docs/envoy/latest/configuration/security/secret)