s3Err = authenticateRequest(ctx, r, action)
	reqInfo := logger.GetReqInfo(ctx)
	if reqInfo == nil {
		return cred, owner, ErrAccessDenied
	}

	cred = reqInfo.Cred
	owner = reqInfo.Owner
	if s3Err != ErrNone {
		return cred, owner, s3Err
	}

	return cred, owner, authorizeRequest(ctx, r, action)
}

func AuthMiddleware(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)

		claims, groups, owner, authErr := metricsRequestAuthenticate(r)
		if authErr != nil || (claims != nil && !claims.VerifyIssuer("prometheus", true)) {
			if ok {
				tc.FuncName = "handler.MetricsAuth"
				tc.ResponseRecorder.LogErrBody = true

	LastModified string   // time string of format "2006-01-02T15:04:05.000Z"
	ETag         string   // md5sum of the copied object part.
}

// Initiator inherit from Owner struct, fields are same
type Initiator Owner

// Owner - bucket owner/principal
type Owner struct {
	ID          string
	DisplayName string
}

				"<Key>foo &#x1; bar</Key>",
				fmt.Sprintf("<Owner><ID>%s</ID><DisplayName>minio</DisplayName></Owner>", globalMinioDefaultOwnerID),
			},
		},
		{
			getListObjectsV2URL(s.endPoint, bucketName, "", "1000", "true", ""),
			[]string{
				"<Key>foo bar 1</Key>",
				"<Key>foo bar 2</Key>",
				"<Key>foo &#x1; bar</Key>",

				return
			}
		case "Group":
			z.Group, err = dc.ReadBool()
			if err != nil {
				err = msgp.WrapError(err, "Group")
				return
			}
		case "Owner":
			z.Owner, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "Owner")
				return
			}
		case "Quorum":
			z.Quorum, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "Quorum")
				return
			}

				objRetention.Mode, byPassSet, r, cred,
				owner)
			if apiErr == ErrAccessDenied {
				return errAuthentication
			}
			return nil
		}

		switch ret.Mode {
		case objectlock.RetGovernance:
			govPerm := isPutRetentionAllowed(oi.Bucket, oi.Name, days,
				objRetention.RetainUntilDate.Time, objRetention.Mode,
				byPassSet, r, cred, owner)

const (
	GlobalMinioDefaultPort = "9000"

	globalMinioDefaultRegion = ""
	// This is a sha256 output of ``arn:aws:iam::minio:user/admin``,
	// this is kept in present form to be compatible with S3 owner ID
	// requirements -
	//
	// ```
	//    The canonical user ID is the Amazon S3–only concept.
	//    It is 64-character obfuscated version of the account ID.
	// ```

		t.Fatal(err)
	}

	_, owner, s3Err := checkKeyValid(req, globalActiveCred.AccessKey)
	if s3Err != ErrNone {
		t.Fatalf("Unexpected failure with %v", errorCodes.ToAPIErr(s3Err))
	}

	if !owner {
		t.Fatalf("Expected owner to be 'true', found %t", owner)
	}

	_, _, s3Err = checkKeyValid(req, "does-not-exist")
	if s3Err != ErrInvalidAccessKeyID {

		return
	}

	objectAPI := api.ObjectAPI()
	if objectAPI == nil {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return
	}

	cred, owner, s3Err := validateSignature(getRequestAuthType(r), r)
	if s3Err != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}

	Objects      []ObjectVersion  `json:",omitempty"` // Only set during MultiObject delete handler.
	Cred         auth.Credentials `json:"-"`
	Region       string           `json:"-"`
	Owner        bool             `json:"-"`
	AuthType     string           `json:"-"`
	tags         []KeyVal         // Any additional info not accommodated by above fields
	sync.RWMutex
}

// NewReqInfo :