javascript [Presign AWS IoT url] #tags：serverless，iot

Posted 2021-05-03

const AWS = require('aws-sdk');
const config = require('@config');
const v4 = require('aws-signature-v4');

getPresignedUrl(sessionToken) {
    try {
      const url = v4.createPresignedURL(
        'GET',
        config.iot.endpoint,
        '/mqtt',
        'iotdevicegateway',
        // crypto.createHash('sha256').update('', 'utf8').digest('hex'),
        AWS.util.crypto.sha256('', 'hex'),
        {
          key: config.iot.accessKey,
          secret: config.iot.secretKey,
          protocol: 'wss',
          region: config.iot.region,
          sessionToken,
        },
      );
	  // if you do not attach policy, you should remove secrity token part
      return url.split('&X-Amz-Security-Token')[0];
    } catch (err) {
      throw err;
    }
  },