@saeris/graphql-scalars/dist-src/port.js

A collection of scalar types using Joi for validation

import { GraphQLScalarType, GraphQLError, Kind } from "graphql";
import { number as yupNumber } from "yup";

const validate = value => {
  yupNumber().typeError(`Value is not a number: ${value}`).notOneOf([Infinity, -Infinity], `Value is not a finite number: ${value}`).test(`integer`, `Value is not a number: ${value}`, val => typeof val === `number` && !isNaN(val)).validateSync(value);
  const parsed = parseInt(value, 10);
  yupNumber().strict(true).required(`Value is not a number: ${value}`).test(`port`, `Value is not a valid TCP port: ${parsed}`, val => !!val && Number.isSafeInteger(val) && val >= 0 && val <= 65535).validateSync(parsed);
  return parsed;
};

export const PortScalar = `scalar Port`;
export const Port = new GraphQLScalarType({
  name: `Port`,
  description: `A field whose value is a valid TCP port within the range of 0 to 65535: https://en.wikipedia.org/wiki/Transmission_Control_Protocol#TCP_ports`,

  serialize(value) {
    return validate(value);
  },

  parseValue(value) {
    return validate(value);
  },

  parseLiteral(ast) {
    if (ast.kind !== Kind.INT) {
      throw new GraphQLError(`Can only validate integers as TCP ports but got a: ${ast.kind}`);
    }

    return validate(ast.value);
  }

});