aws-serverless-express-binary/src/middleware.js

Supported image upload forward to Node Server. This library enables you to utilize AWS Lambda and Amazon API Gateway to respond to web and API requests using your existing Node.js application framework.

module.exports.eventContext = options => function apiGatewayEventParser (req, res, next) {
  options = options || {} // defaults: {reqPropKey: 'apiGateway', deleteHeaders: true}
  const reqPropKey = options.reqPropKey || 'apiGateway'
  const deleteHeaders = options.deleteHeaders === undefined ? true : options.deleteHeaders

  if (!req.headers['x-apigateway-event'] || !req.headers['x-apigateway-context']) {
    console.error('Missing x-apigateway-event or x-apigateway-context header(s)')
    next()
    return
  }

  req[reqPropKey] = {
    event: JSON.parse(decodeURIComponent(req.headers['x-apigateway-event'])),
    context: JSON.parse(decodeURIComponent(req.headers['x-apigateway-context']))
  }

  if (deleteHeaders) {
    delete req.headers['x-apigateway-event']
    delete req.headers['x-apigateway-context']
  }

  next()
}