s3-npm-cache/lib/s3.js

Lightweight runtime to cache NPM dependencies in S3

var AWS = require('aws-sdk'),
    s3 = new AWS.S3(),
    fs = require('fs'),
    q = require('q');

AWS.config.update({
    region: 'ap-southeast-2'
});

var setS3BucketName = function (name) {
    s3BucketName = name;
};

var checkCredentials = function () {
    return process.env.AWS_SECRET_ACCESS_KEY && process.env.AWS_ACCESS_KEY_ID;
};

var uploadFileToS3 = function (fileName) {
    var defer = q.defer();

    fs.readFile('./' + fileName, function (err, buffer) {
        if (err) {
            defer.reject(err);
        }
        s3.putObject({
            Bucket: s3BucketName,
            Key: fileName,
            ACL: 'bucket-owner-full-control',
            ContentType: 'application/gzip',
            Body: buffer
        }, function (err) {
            if (err) {
                defer.reject(err);
            } else {
                defer.resolve();
            }
        });
    });

    return defer.promise;
};

var getFileFromS3 = function (fileName) {
    var defer = q.defer();

    s3.getObject({
        Bucket: s3BucketName,
        Key: fileName
    }, function (err, data) {
        if (err) {
            defer.reject(err);
        } else if (data && data.Body) {
            fs.writeFile(fileName, data.Body, "binary", function (err) {
                if (err) {
                    defer.reject(err);
                }
                defer.resolve(fileName);
            });

        } else {
            defer.reject('No errors downloading the file but no buffer. Please try again.');
        }
    });

    return defer.promise;
};

module.exports = {
    setS3BucketName: setS3BucketName,
    checkCredentials: checkCredentials,
    uploadFileToS3: uploadFileToS3,
    getFileFromS3: getFileFromS3
};