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var AWS = require("aws-sdk");
 
exports.handler = (event, context, callback) => {
    var s3 = new AWS.S3();
    var polly = new AWS.Polly();
    var destinationBucket = "Destination Bucket Name";
    var params = {
        Bucket: event.Records[0].s3.bucket.name,
        Key: event.Records[0].s3.object.key
    };
    s3.getObject(params, function(err, data) {
        if (err) {
            console.log(err, err.stack);
        }
        else {
            var objectKey = event.Records[0].s3.object.key;
            var objectNameMp3 = objectKey.replace(".txt", ".mp3");
            var pollyParams = {
                OutputFormat: "mp3", 
                SampleRate: "8000", 
                Text: data.Body.toString('utf-8'), 
                TextType: "text", 
                VoiceId: "Joanna"
            };
            polly.synthesizeSpeech(pollyParams, function(err, data) {
                if (err) {
                    console.log(err, err.stack);  
                } 
                else {
                    var uploadParam = { Bucket: destinationBucket, Key: objectNameMp3, Body: data.AudioStream, ContentType: "audio/mpeg", StorageClass: "STANDARD" };
                    s3.upload(uploadParam, function(err, data) {
                        if (err) {
                            console.log(err, err.stack);
                        } else{
                            console.log("Speech file upload successful.")
                        }
                    });
                }
            });
        }
    });
};

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "polly:SynthesizeSpeech"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:GetObject"
            ],
            "Resource": [
                "Your Source Bucket ARN/*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:PutObject"
            ],
            "Resource": [
                "Your Destination Bucket ARN/*"
            ]
        }
    ]
}