aws4 example

aws4-example.js

const fetch = require('node-fetch');
const aws4 = require('aws4');

process.on('unhandledRejection', (reason) => {
  console.log('Reason: ' + reason);
});

async function main() {
  const headers = {
    'Content-Type': 'application/json',
    'Accept': 'application/json',
  };
  const method = 'POST';
  const body = JSON.stringify({
    url: 'https://www.example.com/',
  });
  const request = aws4.sign({
    service: 'execute-api',
    region: 'ap-southeast-1',
    path: '/dev/', // this should be your stage
    host: 'API_GATEWAY_ID.execute-api.REGION.amazonaws.com', // API Gateway host
    method,
    headers,
    body,
  },
  // Or use environment variables
  //
  // - AWS_ACCESS_KEY
  // - AWS_ACCESS_KEY_ID
  // - AWS_SECRET_KEY
  // - AWS_SECRET_ACCESS_KEY
  // - AWS_SECRET_TOKEN
  //
  // See https://github.com/mhart/aws4/blob/e2052432f836af766b33ce5782a3bfa21f40db99/aws4.js#L285
  {
    accessKeyId: '',
    secretAccessKey: '',
  });

  const response = await fetch(
    // Invoke URL
    'https://API_GATEWAY_ID.execute-api.REGION.amazonaws.com/STAGE/',
    {
      headers: request.headers,
      method,
      body,
    }
  );

  if (response.status !== 200) {
    throw new Error(await response.text());
  }

  let json = await response.json();
  console.log(json);
  return json;
}

try {
  main();
} catch (error) {
  console.error(error);
}