huncwot/middleware/cors.js

A Programming Environment for TypeScript apps built on top of VS Code

// Copyright 2020 Zaiste & contributors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

const cors = () => {
  return async (context, next) => {
    const { method } = context.request;
  
    const headers = {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'POST, GET, OPTIONS',
      'Access-Control-Allow-Headers': 'Content-Type'
    };
  
    if (method === 'OPTIONS') {
      return {
        statusCode: 200,
        body: '',
        headers
      };
    }
  
    return next({ headers });
  };
}

module.exports = cors;