AWS Lambda - APIGateway create API Key and Usage plan key

index.js

'use strict';
var AWS = require('aws-sdk');
var apigateway = new AWS.APIGateway();
var docClient = new AWS.DynamoDB.DocumentClient();

function generateApiKey() {
    return 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'.replace(/[x]/g, function(c) {
        var r = Math.random() * 36 | 0,
            v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(36);
    });
}
exports.handler = async(event, context, callback) => {
    let body = JSON.parse(event.body);

    var done = function(code, message) {
        let response = {
            "statusCode": code,
            "body": JSON.stringify(message)
        };
        callback(null, response);
    };
    let params = {
        description: body.description,
        enabled: body.status,
        name: body.name,
        value: generateApiKey()
    };

    var createApiKey = await apigateway.createApiKey(params).promise();
    if (createApiKey.id) {
        let params = {
            keyId: createApiKey.id,
            keyType: 'API_KEY',
            usagePlanId: body.plan
        };
        var createUsagePlanKey = await apigateway.createUsagePlanKey(params).promise();
        if (createUsagePlanKey.id) {
            let params = {
                TableName: "api-key",
                Item: { "user": body.user, "id": createApiKey.value, "createdAt":new Date().getTime(), "name":body.name }
            };
            var insertDB = await docClient.put(params).promise();
            if (Object.keys(insertDB).length > 0) {
                done(400, insertDB);
            }
            else {
                done(200, createApiKey);
            }
        }
        else {
            done(400, createUsagePlanKey);
        }
    }
    else {
        done(400, createApiKey);
    }

};