bastienrobert/la-ferme

import { GraphQLScalarType } from 'graphql'
import { Kind } from 'graphql/language'

const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
const nilUUID = '00000000-0000-0000-0000-000000000000'

function isUUID(value) {
  return uuidRegex.test(value) || nilUUID === value
}

const UUID = new GraphQLScalarType({
  name: 'UUID',
  description:
    'The `UUID` scalar type represents UUID values as specified by [RFC 4122](https://tools.ietf.org/html/rfc4122).',
  serialize: value => {
    if (!isUUID(value)) {
      throw new TypeError(`UUID cannot represent non-UUID value: ${value}`)
    }

    return value.toLowerCase()
  },
  parseValue: value => {
    if (!isUUID(value)) {
      throw new TypeError(`UUID cannot represent non-UUID value: ${value}`)
    }

    return value.toLowerCase()
  },
  parseLiteral: ast => {
    if (ast.kind === Kind.STRING) {
      if (isUUID(ast.value)) {
        return ast.value
      }
    }

    return undefined
  }
})

export default {
  UUID
}