@shopify/koa-shopify-graphql-proxy/build/esm/shopify-graphql-proxy.mjs

A wrapper around `koa-better-http-proxy` which allows easy proxying of GraphQL requests from an embedded Shopify app

import proxy from 'koa-better-http-proxy';

const PROXY_BASE_PATH = '/graphql';
const GRAPHQL_PATH_PREFIX = '/admin/api';
function shopifyGraphQLProxy(proxyOptions) {
  return async function shopifyGraphQLProxyMiddleware(ctx, next) {
    const {
      session = {}
    } = ctx;
    const shop = 'shop' in proxyOptions ? proxyOptions.shop : session.shop;
    const accessToken = 'password' in proxyOptions ? proxyOptions.password : session.accessToken;
    const version = proxyOptions.version;
    if (ctx.path !== PROXY_BASE_PATH || ctx.method !== 'POST') {
      await next();
      return;
    }
    if (accessToken == null || shop == null) {
      ctx.throw(403, 'Unauthorized');
    }
    await proxy(shop, {
      https: true,
      parseReqBody: false,
      // Setting request header here, not response. That's why we don't use ctx.set()
      // proxy middleware will grab this request header
      /* eslint-disable @typescript-eslint/naming-convention */
      headers: {
        'Content-Type': 'application/json',
        'X-Shopify-Access-Token': accessToken
      },
      /* eslint-enable @typescript-eslint/naming-convention */
      proxyReqOptDecorator(proxyReqOpts) {
        delete proxyReqOpts.headers.cookie;
        delete proxyReqOpts.headers.Cookie;
        return proxyReqOpts;
      },
      proxyReqPathResolver() {
        return `${GRAPHQL_PATH_PREFIX}/${version}/graphql.json`;
      }
    })(ctx,
    /*
      We want this middleware to terminate, not fall through to the next in the chain,
      but sadly it doesn't support not passing a `next` function. To get around this we
      just pass our own dummy `next` that resolves immediately.
    */
    noop);
  };
}
async function noop() {}

export { GRAPHQL_PATH_PREFIX, PROXY_BASE_PATH, shopifyGraphQLProxy as default };