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

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.
	// ```

		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
	}

		HTTPStatusCode: http.StatusBadRequest,
	},

	// Generic Invalid-Request error. Should be used for response errors only for unlikely
	// corner case errors for which introducing new APIErrorCode is not worth it. LogIf()
	// should be used to log the error at the source of the error for debugging purposes.
	ErrInvalidRequest: {
		Code:           "InvalidRequest",

	if authz := newGlobalAuthZPluginFn(); authz != nil {
		ok, err := authz.IsAllowed(args)
		if err != nil {
			authZLogIf(GlobalContext, err)
		}
		return ok
	}

	// Policies don't apply to the owner.
	if args.IsOwner {
		return true
	}

	// If the credential is temporary, perform STS related checks.
	ok, parentUser, err := sys.IsTempUser(args.AccountName)
	if err != nil {
		return false

		// Optimization for Spark/Hadoop workload where spark sends a garbage
		// request of this kind
		//
		// GET /testbucket/?list-type=2&delimiter=%2F&max-keys=2&prefix=parquet%2F_SUCCESS%2F&fetch-owner=false
		//
		// Here spark is expecting that the List() return empty instead, so from MinIO's point
		// of view if we simply do a GetObjectInfo() on this prefix by treating it as an object

	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
}

				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)

		}
	}
	if errors.Is(err, grid.ErrDisconnected) {
		return true
	}
	// More corner cases suitable for storage REST API
	switch {
	// A peer node can be in shut down phase and proactively
	// return 503 server closed error, consider it as an offline node
	case strings.Contains(err.Error(), http.ErrServerClosed.Error()):
		return true
	// Corner case, the server closed the connection with a keep-alive timeout