@jokio/graphql/src/modules/scalars/datetime/time/index.ts

High level, pre-configured, GraphQL Server

// @flow
/**
 * Copyright (c) 2017, Dirk-Jan Rutten
 * All rights reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

import { GraphQLScalarType } from 'graphql'
import { GraphQLScalarTypeConfig } from 'graphql' // eslint-disable-line
import { Kind } from 'graphql/language'
import {
	validateTime,
	validateJSDate,
	serializeTime,
	serializeTimeString,
	parseTime
} from '../utils'

/**
 * An RFC 3339 compliant time scalar.
 *
 * Input:
 *    This scalar takes an RFC 3339 time string as input and
 *    parses it to a javascript Date (with a year-month-day relative
 *    to the current day).
 *
 * Output:
 *    This scalar serializes javascript Dates and
 *    RFC 3339 time strings to RFC 3339 UTC time strings.
 */
const config: GraphQLScalarTypeConfig<Date, string> = {
	name: 'Time',
	description: 'A time string at UTC, such as 10:15:30Z, compliant with ' +
	'the `full-time` format outlined in section 5.6 of the RFC 3339' +
	'profile of the ISO 8601 standard for representation of dates and ' +
	'times using the Gregorian calendar.',
	serialize(value: any): string {
		if (value instanceof Date) {
			if (validateJSDate(value)) {
				return serializeTime(value)
			}
			throw new TypeError('Time cannot represent an invalid Date instance')
		} else if (typeof value === 'string' || value instanceof String) {
			if (validateTime(value)) {
				return serializeTimeString(value)
			}
			throw new TypeError(
				`Time cannot represent an invalid time-string ${value}.`
			)
		} else {
			throw new TypeError(
				'Time cannot be serialized from a non string, ' +
				'or non Date type ' + JSON.stringify(value)
			)
		}
	},
	parseValue(value: any): Date {
		if (!(typeof value === 'string' || value instanceof String)) {
			throw new TypeError(
				`Time cannot represent non string type ${JSON.stringify(value)}`
			)
		}

		if (validateTime(value)) {
			return parseTime(value)
		}
		throw new TypeError(
			`Time cannot represent an invalid time-string ${value}.`
		)
	},
	parseLiteral(ast): any {
		if (ast.kind === Kind.STRING) {
			if (validateTime(ast.value)) {
				return parseTime(ast.value)
			}
		}
		return null
	}
}

export default new GraphQLScalarType(config)