}
    }

  /** Returns true if the certificate was signed by [issuer]. */
  @Throws(SignatureException::class)
  fun checkSignature(issuer: PublicKey): Boolean {
    val signedData = CertificateAdapters.tbsCertificate.toDer(tbsCertificate)

    return Signature.getInstance(tbsCertificate.signatureAlgorithmName).run {
      initVerify(issuer)
      update(signedData.toByteArray())

// DiscoveryDoc - parses the output from openid-configuration
// for example https://accounts.google.com/.well-known/openid-configuration
//
//nolint:unused
type DiscoveryDoc struct {
	Issuer                           string   `json:"issuer,omitempty"`
	AuthEndpoint                     string   `json:"authorization_endpoint,omitempty"`
	TokenEndpoint                    string   `json:"token_endpoint,omitempty"`

    }
    this.subjectToCaCerts = map
  }

  override fun findByIssuerAndSignature(cert: X509Certificate): X509Certificate? {
    val issuer = cert.issuerX500Principal
    val subjectCaCerts = subjectToCaCerts[issuer] ?: return null

    return subjectCaCerts.firstOrNull {
      try {
        cert.verify(it.publicKey)
        return@firstOrNull true
      } catch (_: Exception) {

		buf.WriteString(color.Blue("%4sSignature Algorithm: ", "") + color.Bold(fmt.Sprintf("%s\n", cert.SignatureAlgorithm)))
	}

	// Issuer information
	buf.WriteString(color.Blue("%4sIssuer: ", ""))
	printName(cert.Issuer.Names, &buf)

	// Validity information
	buf.WriteString(color.Blue("%4sValidity\n", ""))

	}
	return nil
}

// DiscoveryDoc - parses the output from openid-configuration
// for example https://accounts.google.com/.well-known/openid-configuration
type DiscoveryDoc struct {
	Issuer                           string   `json:"issuer,omitempty"`
	AuthEndpoint                     string   `json:"authorization_endpoint,omitempty"`
	TokenEndpoint                    string   `json:"token_endpoint,omitempty"`

)

// DiscoveryDoc - parses the output from openid-configuration
// for example http://localhost:8080/auth/realms/minio/.well-known/openid-configuration
type DiscoveryDoc struct {
	Issuer                           string   `json:"issuer,omitempty"`
	AuthEndpoint                     string   `json:"authorization_endpoint,omitempty"`
	TokenEndpoint                    string   `json:"token_endpoint,omitempty"`

# The base path of dex and the external name of the OpenID Connect service.
# This is the canonical URL that all clients MUST use to refer to dex. If a
# path is provided, dex's HTTP service will listen at a non-root URL.
issuer: http://127.0.0.1:5556/dex

# The storage configuration determines where dex stores its state. Supported
# options include SQL flavors and Kubernetes third party resources.
#

| azp        | _string_       | The authorized party for which the token is issued to. The client identifier of the OAuth client that the token is issued for, is sent herewith.                                        |

## Prerequisites

Install Dex by following [Dex Getting Started Guide](https://dexidp.io/docs/getting-started/)

### Start Dex

```
~ ./bin/dex serve dex.yaml
time="2020-07-12T20:45:50Z" level=info msg="config issuer: http://127.0.0.1:5556/dex"
time="2020-07-12T20:45:50Z" level=info msg="config storage: sqlite3"
time="2020-07-12T20:45:50Z" level=info msg="config static client: Example App"

The following self-signed certificate is issued for `consoleAdmin`. So, MinIO would associate it with the pre-defined `consoleAdmin` policy.

```
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            35:ac:60:46:ad:8d:de:18:dc:0b:f6:98:14:ee:89:e8
        Signature Algorithm: ED25519
        Issuer: CN = consoleAdmin
        Validity