public ActionResult Index()
{
var config = new S3Config {
// Unique Policy ID and duration
Uuid = Guid.NewGuid(),
ExpirationTime = TimeSpan.FromHours(1),
// Authentication
AccessKey = "YOUR_ACCESS_KEY",
SecretAccessKey = "YOUR_SECRET_KEY",
// Bucket name and key prefix (folder)
Bucket = "YOUR_BUCKET",
BucketUrl = "http://YOUR_BUCKET.s3.amazonaws.com/",
KeyPrefix = "YOUR_UPLOAD_ROOT/",
// See http://docs.aws.amazon.com/AmazonS3/latest/dev/ACLOverview.html#CannedACL
Acl = "private",
// Mime type prefix
ContentTypePrefix = "image/",
// Fully qualified URL of an "empty document" in the same origin
// Required for IE < 10
SuccessUrl = "http://localhost:62629/home/success"
};
ViewBag.Policy = Policy(config);
ViewBag.PolicySignature = Sign(ViewBag.Policy, config.SecretAccessKey);
ViewBag.S3Config = config;
return View();
}
private string Policy(S3Config config)
{
var policyJson = new JavaScriptSerializer().Serialize(new
{
expiration = DateTime.UtcNow.Add(config.ExpirationTime).ToString("yyyy-MM-ddTHH:mm:ssZ"),
conditions = new object[] {
new { bucket = config.Bucket },
new [] { "starts-with", "$key", config.KeyPrefix },
new { acl = config.Acl },
new [] { "starts-with", "$success_action_redirect", "" },
new [] { "starts-with", "$Content-Type", config.ContentTypePrefix },
new Dictionary<string, string> {{ "x-amz-meta-uuid", config.Uuid.ToString() }}
}
});
return Convert.ToBase64String(Encoding.UTF8.GetBytes(policyJson));
}
