commerce/framework/shopify/api/utils/is-allowed-method.ts

import type { NextApiRequest, NextApiResponse } from 'next'

export default function isAllowedMethod(
  req: NextApiRequest,
  res: NextApiResponse,
  allowedMethods: string[]
) {
  const methods = allowedMethods.includes('OPTIONS')
    ? allowedMethods
    : [...allowedMethods, 'OPTIONS']

  if (!req.method || !methods.includes(req.method)) {
    res.status(405)
    res.setHeader('Allow', methods.join(', '))
    res.end()
    return false
  }

  if (req.method === 'OPTIONS') {
    res.status(200)
    res.setHeader('Allow', methods.join(', '))
    res.setHeader('Content-Length', '0')
    res.end()
    return false
  }

  return true
}