public static string GetExpiringLink(string bucket, string objectName, TimeSpan expires, S3LinkType linkType = S3LinkType.Subdomain, bool secure = false)
{
var filename = System.IO.Path.GetFileName(objectName);
filename = filename.Replace("%20", " ");
filename = filename.Replace("+", " ");
objectName = objectName.Replace("%20", " ");
objectName = Uri.EscapeUriString(objectName);
objectName = objectName.Replace("%2F", "/");
objectName = objectName.Replace("+", "%20");
string s3Url;
if (linkType == S3LinkType.Subfolder)
{
s3Url = $"http{(secure ? "s" : "")}://s3.amazonaws.com/{bucket}";
}
else
{
s3Url = $"http{(secure ? "s" : "")}://{bucket}{(linkType == S3LinkType.Cname ? "" : ".s3.amazonaws.com")}";
}
Int64 expiresTime = ((Int64) expires.TotalSeconds) + (Int64) DateTime.UtcNow.ToUnixTimeSeconds();
string bucketName = "/" + bucket;
string options = string.Format("response-content-disposition=attachment; filename=\"{0}\"", filename);
string toSign = string.Format("GET\n\n\n{0}\n{1}{2}?{3}", expiresTime, bucketName, objectName, options);
using (var sha1 = new HMACSHA1(Encoding.UTF8.GetBytes(_password)))
{
var signed = sha1.ComputeHash(Encoding.UTF8.GetBytes(toSign));
var encoded = Uri.EscapeDataString(Convert.ToBase64String(signed));
options = options.Replace(" ", "%20");
return $"{s3Url}{string.Empty}{objectName}?AWSAccessKeyId={_username}&Expires={expiresTime}&Signature={encoded}&{options}";
}
}
public static string GetExpiringLink(string bucket, string objectName, TimeSpan expires, S3LinkType linkType = S3LinkType.Subdomain, bool secure = false)
{
var filename = System.IO.Path.GetFileName(objectName);
filename = filename.Replace("%20", " ");
filename = filename.Replace("+", " ");
objectName = objectName.Replace("%20", " ");
objectName = Uri.EscapeUriString(objectName);
objectName = objectName.Replace("%2F", "/");
objectName = objectName.Replace("+", "%20");
string s3Url;
if (linkType == S3LinkType.Subfolder)
{
s3Url = $"http{(secure ? "s" : "")}://s3.amazonaws.com/{bucket}";
}
else
{
s3Url = $"http{(secure ? "s" : "")}://{bucket}{(linkType == S3LinkType.Cname ? "" : ".s3.amazonaws.com")}";
}
Int64 expiresTime = ((Int64)expires.TotalSeconds) + (Int64)DateTime.UtcNow.ToUnixTimeSeconds();
string bucketName = "/" + bucket;
string options = string.Format("response-content-disposition=attachment; filename=\"{0}\"", filename);
string toSign = string.Format("GET\n\n\n{0}\n{1}{2}?{3}", expiresTime, bucketName, objectName, options);
using (var sha1 = new HMACSHA1(Encoding.UTF8.GetBytes(_password)))
{
var signed = sha1.ComputeHash(Encoding.UTF8.GetBytes(toSign));
var encoded = Uri.EscapeDataString(Convert.ToBase64String(signed));
options = options.Replace(" ", "%20");
return($"{s3Url}{string.Empty}{objectName}?AWSAccessKeyId={_username}&Expires={expiresTime}&Signature={encoded}&{options}");
}
}
