shopify checkout redirect & api handler

framework/shopify/api/checkout/index.ts

@@ -1,5 +1,23 @@
-const getCheckout = async (req: any, res: any, config: any): Promise<any> => {
-  res.end()
+import isAllowedMethod from '../utils/is-allowed-method'
+import createApiHandler, {
+  ShopifyApiHandler,
+} from '../utils/create-api-handler'
+
+import { SHOPIFY_CHECKOUT_URL_COOKIE } from '@framework/const'
+
+const METHODS = ['GET']
+
+const checkoutApi: ShopifyApiHandler<any> = async (req, res) => {
+  if (!isAllowedMethod(req, res, METHODS)) return
+
+  const { cookies } = req
+  const checkoutUrl = cookies[SHOPIFY_CHECKOUT_URL_COOKIE]
+
+  if (checkoutUrl) {
+    res.redirect(checkoutUrl)
+  } else {
+    res.redirect('/cart')
+  }
 }
 
-export default getCheckout
+export default createApiHandler(checkoutApi, {}, {})

framework/shopify/api/utils/create-api-handler.ts

@@ -0,0 +1,58 @@
+import type { NextApiHandler, NextApiRequest, NextApiResponse } from 'next'
+import { ShopifyConfig, getConfig } from '..'
+
+export type ShopifyApiHandler<
+  T = any,
+  H extends ShopifyHandlers = {},
+  Options extends {} = {}
+> = (
+  req: NextApiRequest,
+  res: NextApiResponse<ShopifyApiResponse<T>>,
+  config: ShopifyConfig,
+  handlers: H,
+  // Custom configs that may be used by a particular handler
+  options: Options
+) => void | Promise<void>
+
+export type ShopifyHandler<T = any, Body = null> = (options: {
+  req: NextApiRequest
+  res: NextApiResponse<ShopifyApiResponse<T>>
+  config: ShopifyConfig
+  body: Body
+}) => void | Promise<void>
+
+export type ShopifyHandlers<T = any> = {
+  [k: string]: ShopifyHandler<T, any>
+}
+
+export type ShopifyApiResponse<T> = {
+  data: T | null
+  errors?: { message: string; code?: string }[]
+}
+
+export default function createApiHandler<
+  T = any,
+  H extends ShopifyHandlers = {},
+  Options extends {} = {}
+>(
+  handler: ShopifyApiHandler<T, H, Options>,
+  handlers: H,
+  defaultOptions: Options
+) {
+  return function getApiHandler({
+    config,
+    operations,
+    options,
+  }: {
+    config?: ShopifyConfig
+    operations?: Partial<H>
+    options?: Options extends {} ? Partial<Options> : never
+  } = {}): NextApiHandler {
+    const ops = { ...operations, ...handlers }
+    const opts = { ...defaultOptions, ...options }
+
+    return function apiHandler(req, res) {
+      return handler(req, res, getConfig(config), ops, opts)
+    }
+  }
+}

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

@@ -0,0 +1,28 @@
+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
+}