return jwtgo.ErrSignatureInvalid
	}
	borrow.ReturnAll()

	if claims.AccessKey == "" && claims.Subject == "" {
		return jwtgo.NewValidationError("accessKey/sub missing",
			jwtgo.ValidationErrorClaimsInvalid)
	}

	// Signature is valid, lets validate the claims for
	// other fields such as expiry etc.
	return claims.Valid()
}

	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
			}

	if err != nil {
		return nil, err
	}

	claims[expClaim] = UTCNow().Add(expiryDur).Unix()
	claims[ldapUserN] = user
	claims[ldapUser] = lookupResult.NormDN

	cred, err := auth.GetNewCredentialsWithMetadata(claims, globalActiveCred.SecretKey)
	if err != nil {
		return nil, err
	}

	// Set the parent of the temporary access key, this is useful

		}

		// Finally, if there is no parent policy, check if a policy claim is
		// present in the session token.
		if len(policies) == 0 {
			// If there is no parent policy mapping, we fall back to
			// using policy claim from JWT.
			policySet, ok := args.GetPolicies(iamPolicyClaimNameOpenID())
			if !ok {
				// When claims are set, it should have a policy claim field.
				return false
			}

				Action:          policy.ListBucketAction,
				BucketName:      bucketInfo.Name,
				ConditionValues: getConditionValues(r, "", cred),
				IsOwner:         owner,
				ObjectName:      "",
				Claims:          cred.Claims,
			}) {
				bucketsInfo[n] = bucketInfo
				n++
			} else if globalIAMSys.IsAllowed(policy.Args{
				AccountName:     cred.AccessKey,
				Groups:          cred.Groups,

		}

		// Retrieve the credential's claims.
		secret, err := getTokenSigningKey()
		if err != nil {
			c.Fatalf("Error getting token signing key: %v", err)
		}
		claims, err := getClaimsFromTokenWithSecret(value.SessionToken, secret)
		if err != nil {
			c.Fatalf("Error getting claims from token: %v", err)
		}

		// Validate claims.
		dnClaim := claims.MapClaims[ldapActualUser].(string)

			continue
		}

		var (
			err    error
			claims *jwt.MapClaims
		)

		if cred.IsServiceAccount() {
			claims, err = getClaimsFromTokenWithSecret(cred.SessionToken, cred.SecretKey)
		} else if cred.IsTemp() {
			var secretKey string
			secretKey, err = getTokenSigningKey()
			if err != nil {
				continue
			}
			claims, err = getClaimsFromTokenWithSecret(cred.SessionToken, secretKey)
		}

	}

	// Verify the session token of the stsCred
	claims, err := auth.ExtractClaims(stsCred.SessionToken, secretKey)
	if err != nil {
		return fmt.Errorf("STS credential could not be verified: %w", err)
	}

	mapClaims := claims.Map()
	expiry, err := auth.ExpToInt64(mapClaims["exp"])
	if err != nil {
		return fmt.Errorf("Expiry claim was not found: %v: %w", mapClaims, err)
	}

			Action:          policy.GetObjectAction,
			BucketName:      bucketName,
			ConditionValues: getConditionValues(r, "", cred),
			IsOwner:         owner,
			ObjectName:      "",
			Claims:          cred.Claims,
		}) {
			rd = true
		}

		if globalIAMSys.IsAllowed(policy.Args{
			AccountName:     cred.AccessKey,
			Groups:          cred.Groups,
			Action:          policy.PutObjectAction,

// are read back as NUL-bytes.
//
// Calling Read on special types like [TypeLink], [TypeSymlink], [TypeChar],
// [TypeBlock], [TypeDir], and [TypeFifo] returns (0, [io.EOF]) regardless of what
// the [Header.Size] claims.
func (tr *Reader) Read(b []byte) (int, error) {
	if tr.err != nil {
		return 0, tr.err
	}
	n, err := tr.curr.Read(b)
	if err != nil && err != io.EOF {
		tr.err = err
	}
	return n, err
}