/**
 * Copyright 2019, OpenCensus Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ import { TagKey , TagValue } from './types' ; const nonPrintableCharsRegex = /[^\u0020-\u007e]/ ; const TAG_KEY_MAX_LENGTH = 255 ; /** Determines whether the given String is a valid tag key. */ export function isValidTagKey ( tagKey ) { if ( ! tagKey || ! tagKey . name ) { return false ; } return ( isPrintableString ( tagKey . name ) && tagKey . name . length > 0 && tagKey . name . length <= TAG_KEY_MAX_LENGTH ) ; } /** Determines whether the given String is a valid tag value. */ export function isValidTagValue ( tagValue ) { if ( ! tagValue || tagValue . value === null || tagValue . value === undefined ) { return false ; } return ( isPrintableString ( tagValue . value ) && tagValue . value . length <= TAG_KEY_MAX_LENGTH ) ; } function isPrintableString ( name ) { return ! nonPrintableCharsRegex . test ( name ) ; }