Custom AWS S3 Helper Class AWSSDK Wrapper

Implements some very commonly used AWS S3 functionality. (need to merge with my other AWS wrapper classes, Route53, EC2, etc)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using System.IO;
using System.Collections.Specialized;
using System.Configuration;

//uses AWSSDK.dll from amazon
using Amazon;
using Amazon.S3;
using Amazon.S3.Model;

using System.Xml.Linq;
using System.Xml;

using System.Data;

namespace AIS.Common
{
    public static class AWSHelper
    {
        private static List<S3Bucket> LoadS3Buckets()
        {
            System.Collections.Specialized.NameValueCollection appConfig = System.Configuration.ConfigurationManager.AppSettings;
            using (var s3client = Amazon.AWSClientFactory.CreateAmazonS3Client(ConfigValues.AWSAccessKey, ConfigValues.AWSSecretKey))
            {
                return s3client.ListBuckets().Buckets;
            }
        }

        private static List<S3Object> LoadS3Objects(string bucketname)
        {
            System.Collections.Specialized.NameValueCollection appConfig = System.Configuration.ConfigurationManager.AppSettings;
            using (var s3client = Amazon.AWSClientFactory.CreateAmazonS3Client(ConfigValues.AWSAccessKey, ConfigValues.AWSSecretKey))
            {
                return s3client.ListObjects(new ListObjectsRequest() { BucketName = bucketname }).S3Objects;
            }
        }

        private static void LoadS3File(string bucketname, string keyname, HttpResponse response, string contenttype)
        {
            NameValueCollection appConfig = ConfigurationManager.AppSettings;


            using (var s3client = Amazon.AWSClientFactory.CreateAmazonS3Client(ConfigValues.AWSAccessKey, ConfigValues.AWSSecretKey))
            {

                GetObjectRequest s3request = new GetObjectRequest()
                    .WithBucketName(bucketname).WithKey(keyname);

                using (GetObjectResponse s3response = s3client.GetObject(s3request))
                {
                    string title = s3response.Metadata["x-amz-meta-title"];

                    response.Clear();

                    //Response.Write(string.Format("The object's title is {0}", title));
                    //Response.AddHeader
                    //Response.ContentType="application/swf";
                    ////Response.ContentType="contenttype";

                    response.ContentType = s3response.ContentType; //s3response.Headers["Content-Length"];
                    long filesize = s3response.ContentLength;

                    byte[] buffer = new byte[(int)filesize];

                    response.BinaryWrite(ConvertStreamToBytes(s3response.ResponseStream, filesize));

                    response.Flush();
                    response.Close();
                }
            }
        }

        public static string GetS3UrlToVideo(string bucketname, string keyname)
        {
            System.Collections.Specialized.NameValueCollection appConfig = System.Configuration.ConfigurationManager.AppSettings;
            string url = "";
            using (var s3client = Amazon.AWSClientFactory.CreateAmazonS3Client(ConfigValues.AWSAccessKey, ConfigValues.AWSSecretKey))
            {
                Amazon.S3.Model.GetPreSignedUrlRequest request = new Amazon.S3.Model.GetPreSignedUrlRequest()
                    .WithBucketName(bucketname)
                    .WithKey(keyname)
                    .WithProtocol(Amazon.S3.Model.Protocol.HTTP)
                    .WithVerb(HttpVerb.GET)
                .WithExpires(DateTime.Now.AddMinutes(ConfigValues.VideoURLExpiration));

                Amazon.S3.Model.GetPreSignedUrlRequest r = new GetPreSignedUrlRequest();

                url = s3client.GetPreSignedURL(request);

                url= "https://s3.amazonaws.com/" + bucketname + keyname;
            }

            //return System.Xml.XmlConvert.EncodeName(url);
            return url;
        }

        public static byte[] ConvertStreamToBytes(Stream input, long filesize)
        {
            byte[] buffer = new byte[(int)filesize];
            using (MemoryStream ms = new MemoryStream())
            {
                int read;
                while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
                {
                    ms.Write(buffer, 0, read);
                }
                return ms.ToArray();
            }
        }
    }
}

About Ronnie Diaz

Ronnie Diaz is a software engineer and tech consultant. Ronnie started his career in front-end and back-end development for companies in ecommerce, service industries and remote education. This work transitioned from traditional desktop client-server applications through early cloud development. Software included human resource management and service technician workflows, online retail e-commerce and electronic ordering and fulfillment, IVR customer relational systems, and video streaming remote learning SCORM web applications. Hands on server experience and software performance optimization led to creation of a startup business focused on collocated data center services and continued experience with video streaming hardware and software. This led to a career in Amazon Prime Video where Ronnie is currently employed, building software and systems which stream live sports and events for millions of viewers around the world.

Posted on December 13, 2013, in .NET Reference, Programming & Development and tagged , , , , , , , , , . Bookmark the permalink. Leave a comment.

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