lambda_sending_texts.js

const AWS = require('aws-sdk');
AWS.config.update({region: 'us-east-1'}); //Set Region

exports.handler = (event) => {
  return new Promise((res, rej)=>{
    const sns = new AWS.SNS();
    console.log('event', event);
    let {phonenumber, message, requestContext} = JSON.parse(event.body);
    let {http} = event.requestContext;
    if(http.method ==='POST'){
      if(http.path.includes('request-six-digit-confirmation-code')){ // executed differently depending on path
          let randomSixDigits = Math.floor(100000 + Math.random() * 900000); // 6 digits must start with 1-9, not 0
          let messageWrapper = `${message} [${randomSixDigits}]` // app decides what message is, lambda decides randomSixDigits
          let params = {
            "PhoneNumber":phonenumber,
            "Message":messageWrapper
          };
          sns.publish(params, function(err, data) {
            if (err){
              console.log('err', err);
              rej({statusCode:'500'})
              
            } // an error occurred
            else res({statusCode:'200',message:data}) // successful response
          })
      }
  }
  }
  );
}