Lamdba function to map GuardDuty Findings to Opsgenie priorities

gistfile1.js

var AWS = require('aws-sdk');
exports.handler = (event, context, callback) => {
        console.log(event);
        console.log(context);
        var sns = new AWS.SNS();
        if ( event.detail.severity > 0.1 && event.detail.severity < 3.9 ) {
            event.detail.priority = "P3";
        } else if (event.detail.severity > 3.9 && event.detail.severity < 6.9 ) {
            event.detail.priority = "P2";
        } else if (event.detail.severity > 6.9 && event.detail.severity < 9.0 ) {
            event.detail.priority = "P1";
        }
        sns.publish({Message: JSON.stringify(event), TopicArn:"arn:aws:sns:us-east-1:86753098675309:OpsGenie"}, function(err, data) {
    if(err) {
        console.log('error publishing to SNS');
        context.fail(err);
    } else {
        console.log('message published to SNS');
        context.succeed(null, data);
    }
});
        return event;
};