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+# `@bluebeela/nextjs-shopify-auth`
+
+[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](LICENSE)
+
+Authenticate your [Next.js](https://nextjs.org/) app with [Shopify](https://www.shopify.com/).
+
+Sister module to [`@shopify/shopify-express`](https://www.npmjs.com/package/@shopify/shopify-express) and [`@shopify/koa-shopify-auth`](https://www.npmjs.com/package/@shopify/koa-shopify-auth), but for nextjs.
+
+### Missing features
+- Registering webhook
+- Listening to webhook
+
+A example app without the webhook for the [Build a Shopify app with Node and React](https://developers.shopify.com/tutorials/build-a-shopify-app-with-node-and-react) tutorial is available [here](https://github.com/bluebeel/nextjs-shopify)
+
+
+
+## Installation
+
+```bash
+$ npm install @bluebeela/nextjs-shopify-auth
+```
+
+## Usage
+
+This package exposes `createShopifyAuth` by default, `authenticateShopifyPage`, `authenticateShopifyAPI`, and `NextShopifyApiRequest`, as a named export.
+
+```js
+import createShopifyAuth, {authenticateShopifyPage, authenticateShopifyAPI, NextShopifyApiRequest} from '@bluebeela/nextjs-shopify-auth';
+```
+
+### createShopifyAuth
+
+Returns a set of helpers that you will need to use in 4 different routes explained below.
+
+```js
+const shopifyAuthOptions = {
+  // your shopify app api key
+  apiKey: process.env.SHOPIFY_API_KEY,
+  // your shopify app secret
+  secret: process.env.SHOPIFY_API_SECRET,
+  // your app url
+  appUrl: process.env.HOST,
+  // if specified, mounts the routes off of the given path
+  // eg. /api/shopify/auth, /api/shopify/auth/callback
+  // defaults to ""
+  prefix: "/api/shopify",
+  // scopes to request on the merchants store
+  scopes: ["read_products", "write_products"],
+  // set access mode, default is "online"
+  accessMode: "online",
+  // callback for when auth is completed
+  async afterAuth({
+    shopOrigin,
+    shopifyToken,
+    shopifyAssociatedUser,
+    req,
+    res,
+  }) {
+    console.log(
+      `We're authenticated on shop ${shopOrigin}: ${shopifyToken} with user ${JSON.stringify(
+        shopifyAssociatedUser
+      )}`
+    );
+    res.writeHead(302, { Location: `/` });
+    res.end();
+  },
+};
+
+const shopify = createShopifyAuth(shopifyAuthOptions);
+```
+
+#### in pages/api/example-api-route-you-want-to-protect.js
+Simply add the authenticateShopifyAPI middleware to your route to verify that the request is secure.
+
+```js
+import { authenticateShopifyAPI } from "@bluebeela/nextjs-shopify-auth";
+
+export default authenticateShopifyAPI(async function helloWorld(req, res) {
+  return await res.json({ hello: "world" });
+});
+```
+
+#### in pages/protected-page.js
+Simply add the authenticateShopifyPage middleware to your route to verify that the request is secure.
+
+```js
+// random page
+import { authenticateShopifyPage } from "@bluebeela/nextjs-shopify-auth";
+
+export const getServerSideProps = authenticateShopifyPage(async (ctx) => {
+  return { props: { hello: "world"}}
+});
+```
+
+### Required API routes
+
+In a Next.js app, you will need to create these 5 routes:
+ - /api/shopify/auth/callback
+ - /api/shopify/auth/enable_cookies
+ - /api/shopify/auth/index
+ - /api/shopify/auth/inline
+ - /api/shopify/verify-token
+
+Theses files will need the following content for the authentication and verification processes to work as expected
+
+#### /api/shopify/auth/callback
+
+```js
+import shopify from "../../../../lib/shopify"; // lib is on the root dir
+
+export default async function shopifyAuthCallback(req, res) {
+	const { oAuthCallback } = shopify;
+
+	await oAuthCallback(req, res);
+}
+```
+
+#### /api/shopify/auth/enable-cookies
+
+```js
+import shopify from "../../../../lib/shopify"; // lib is on the root dir
+
+export default async function shopifyAuthEnableCookies(req, res) {
+	const { enableCookies } = shopify;
+
+	await enableCookies(req, res);
+}
+```
+
+#### /api/shopify/auth/index
+
+```js
+import {
+  hasCookieAccess,
+  shouldPerformInlineOAuth,
+  grantedStorageAccess,
+} from "@bluebeela/nextjs-shopify-auth";
+import shopify from "../../../../lib/shopify"; // lib is on the root dir
+
+export default async function shopifyAuthIndex(req, res) {
+  const {
+    enableCookiesRedirect,
+    oAuthStart,
+    topLevelOAuthRedirect,
+    requestStorageAccess,
+  } = shopify;
+
+  if (!hasCookieAccess(req.cookies)) {
+    await enableCookiesRedirect(req, res);
+    return;
+  }
+
+  if (!grantedStorageAccess(req.cookies)) {
+    await requestStorageAccess(req, res);
+    return;
+  }
+
+  if (shouldPerformInlineOAuth(req.cookies)) {
+    await oAuthStart(req, res);
+    return;
+  }
+
+  await topLevelOAuthRedirect(req, res);
+}
+
+```
+
+#### /api/shopify/auth/inline
+
+```js
+import shopify from "../../../../lib/shopify"; // lib is on the root dir
+
+export default async function shopifyAuthInline(req, res) {
+  const { oAuthStart } = shopify;
+
+  await oAuthStart(req, res);
+}
+
+```
+
+#### /api/shopify/verify-token
+
+This is a simple proxy route to avoid CORS issues we would face by hitting Shopify API from a different domain
+
+```js
+export default async function verifyToken(req, res) {
+  const { shopOrigin, shopifyToken } = req.cookies;
+
+  const response = await fetch(
+      `https://${shopOrigin}/admin/metafields.json`,
+      {
+        method: "GET",
+        headers: {
+          "Content-Type": "application/json",
+          "X-Shopify-Access-Token": shopifyToken,
+        },
+      },
+  );
+  res.status(response.status).end();
+}
+```