// Get current object layer instance.
	objectAPI := newObjectLayerFn()
	if objectAPI == nil || globalNotificationSys == nil {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return nil, auth.Credentials{}
	}

	for _, action := range actions {
		// Validate request signature.

func checkKeyValid(r *http.Request, accessKey string) (auth.Credentials, bool, APIErrorCode) {
	cred := globalActiveCred
	if cred.AccessKey != accessKey {
		if !globalIAMSys.Initialized() {
			// Check if server has initialized, then only proceed
			// to check for IAM users otherwise its okay for clients
			// to retry with 503 errors when server is coming up.
			return auth.Credentials{}, false, ErrServerNotInitialized
		}

    """
    METHOD = 'assume-role-client-grants'
    CANONICAL_NAME = 'AssumeRoleClientGrants'

    def __init__(self, cid, csec,
                 idp_ep='http://localhost:8080/auth/realms/minio/protocol/openid-connect/token',
                 sts_ep='http://localhost:9000'):
        self.cid = cid
        self.csec = csec
        self.idp_ep = idp_ep
        self.sts_ep = sts_ep

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"sync"
	"time"

	jwtgo "github.com/golang-jwt/jwt/v4"
	"github.com/minio/minio/internal/arn"
	"github.com/minio/minio/internal/auth"
	xnet "github.com/minio/pkg/v2/net"
	"github.com/minio/pkg/v2/policy"
)

type publicKeys struct {
	*sync.RWMutex

	// map of kid to public key
	pkMap map[string]interface{}
}

# Settings and configurations that are common for all containers
x-minio-common: &minio-common
  image: quay.io/minio/minio:${RELEASE}
  command: server http://site1-minio{1...4}/data{1...2}
  environment:
    - MINIO_PROMETHEUS_AUTH_TYPE=public
    - CI=true

# starts 4 docker containers running minio server instances.
# using nginx reverse proxy, load balancing, you can access
# it through port 9000.
services:
  site1-minio1:

# Settings and configurations that are common for all containers
x-minio-common: &minio-common
  image: quay.io/minio/minio:${RELEASE}
  command: server http://site2-minio{1...4}/data{1...2}
  environment:
    - MINIO_PROMETHEUS_AUTH_TYPE=public
    - CI=true

# starts 4 docker containers running minio server instances.
# using nginx reverse proxy, load balancing, you can access
# it through port 9000.
services:
  site2-minio1:

const (
	WebhookEndpoint   = "endpoint"
	WebhookAuthToken  = "auth_token"
	WebhookQueueDir   = "queue_dir"
	WebhookQueueLimit = "queue_limit"
	WebhookClientCert = "client_cert"
	WebhookClientKey  = "client_key"

	EnvWebhookEnable     = "MINIO_NOTIFY_WEBHOOK_ENABLE"
	EnvWebhookEndpoint   = "MINIO_NOTIFY_WEBHOOK_ENDPOINT"
	EnvWebhookAuthToken  = "MINIO_NOTIFY_WEBHOOK_AUTH_TOKEN"
	EnvWebhookQueueDir   = "MINIO_NOTIFY_WEBHOOK_QUEUE_DIR"

		{
			authString:    "NoV2Prefix",
			expectedError: ErrSignatureVersionNotSupported,
		},
		// Test case - 3.
		// Test case with missing parts in the Auth string.
		// below is the correct format of V2 Authorization header.
		// Authorization = "AWS" + " " + AWSAccessKeyId + ":" + Signature
		{
			authString:    signV2Algorithm,
			expectedError: ErrMissingFields,
		},

```
export MINIO_PROMETHEUS_AUTH_TYPE="public"
minio server ~/test
```

### 3. Configuring Prometheus

#### 3.1 Authenticated Prometheus config

		authFields := strings.Split(strings.TrimSpace(v4Auth), ",")
		if len(authFields) != 3 {
			return auth.Credentials{}, false, ErrMissingFields
		}
		ch, s3Err = parseCredentialHeader(authFields[0], region, stype)
		if s3Err != ErrNone {
			return auth.Credentials{}, false, s3Err
		}
	}
	return checkKeyValid(r, ch.accessKey)
}

// parse credentialHeader string into its structured form.