public void Authenticate(RestSharp.IRestClient client, RestSharp.IRestRequest request)
{
DateTime signingDate = DateTime.UtcNow;
SetContentMd5(request);
SetContentSha256(request);
SetHostHeader(request, client);
SetDateHeader(request, signingDate);
SortedDictionary <string, string> headersToSign = GetHeadersToSign(request);
string signedHeaders = GetSignedHeaders(headersToSign);
string canonicalRequest = GetCanonicalRequest(client, request, headersToSign);
byte[] canonicalRequestBytes = System.Text.Encoding.UTF8.GetBytes(canonicalRequest);
string canonicalRequestHash = BytesToHex(ComputeSha256(canonicalRequestBytes));
string stringToSign = GetStringToSign(Region, signingDate, canonicalRequestHash);
byte[] signingKey = GenerateSigningKey(Region, signingDate);
byte[] stringToSignBytes = System.Text.Encoding.UTF8.GetBytes(stringToSign);
byte[] signatureBytes = SignHmac(signingKey, stringToSignBytes);
string signature = BytesToHex(signatureBytes);
string authorization = GetAuthorizationHeader(signedHeaders, signature, signingDate, Region);
request.AddHeader("Authorization", authorization);
}
public string PresignURL(RestSharp.IRestClient client, RestSharp.IRestRequest request, int expires)
{
DateTime signingDate = DateTime.UtcNow;
string requestQuery = "";
string path = request.Resource;
requestQuery = "X-Amz-Algorithm=AWS4-HMAC-SHA256&";
requestQuery += "X-Amz-Credential="
+ this.AccessKeyId
+ Uri.EscapeDataString("/" + GetScope(Region, signingDate))
+ "&";
requestQuery += "X-Amz-Date="
+ signingDate.ToString("yyyyMMddTHHmmssZ")
+ "&";
requestQuery += "X-Amz-Expires="
+ expires
+ "&";
requestQuery += "X-Amz-SignedHeaders=host";
string canonicalRequest = GetPresignCanonicalRequest(client, request, requestQuery);
byte[] canonicalRequestBytes = System.Text.Encoding.UTF8.GetBytes(canonicalRequest);
string canonicalRequestHash = BytesToHex(ComputeSha256(canonicalRequestBytes));
string stringToSign = GetStringToSign(Region, signingDate, canonicalRequestHash);
byte[] signingKey = GenerateSigningKey(Region, signingDate);
byte[] stringToSignBytes = System.Text.Encoding.UTF8.GetBytes(stringToSign);
byte[] signatureBytes = SignHmac(signingKey, stringToSignBytes);
string signature = BytesToHex(signatureBytes);
// Return presigned url.
return(client.BaseUrl + path + "?" + requestQuery + "&X-Amz-Signature=" + signature);
}
private string GetCanonicalRequest(RestSharp.IRestClient client, RestSharp.IRestRequest request,
SortedDictionary <string, string> headersToSign)
{
LinkedList <string> canonicalStringList = new LinkedList <string>();
canonicalStringList.AddLast(request.Method.ToString());
if (!string.IsNullOrWhiteSpace(request.Resource))
{
string[] path = request.Resource.Split(new char[] { '?' }, 2);
if (!path[0].StartsWith("/"))
{
path[0] = "/" + path[0];
}
canonicalStringList.AddLast(path[0]);
string query = "";
if (path.Length == 2)
{
var parameterString = path[1];
var parameterList = parameterString.Split('&');
SortedSet <string> sortedQueries = new SortedSet <string>();
foreach (string individualParameterString in parameterList)
{
if (individualParameterString.Contains('='))
{
string[] splitQuery = individualParameterString.Split(new char[] { '=' }, 2);
sortedQueries.Add(splitQuery[0] + "=" + splitQuery[1]);
}
else
{
sortedQueries.Add(individualParameterString + "=");
}
}
query = string.Join("&", sortedQueries);
}
canonicalStringList.AddLast(query);
}
foreach (string header in headersToSign.Keys)
{
canonicalStringList.AddLast(header + ":" + headersToSign[header]);
}
canonicalStringList.AddLast("");
canonicalStringList.AddLast(string.Join(";", headersToSign.Keys));
if (headersToSign.Keys.Contains("x-amz-content-sha256"))
{
canonicalStringList.AddLast(headersToSign["x-amz-content-sha256"]);
}
else
{
canonicalStringList.AddLast("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
}
return(string.Join("\n", canonicalStringList));
}
private string GetPresignCanonicalRequest(RestSharp.IRestClient client, RestSharp.IRestRequest request, string requestQuery)
{
LinkedList <string> canonicalStringList = new LinkedList <string>();
canonicalStringList.AddLast(request.Method.ToString());
string path = request.Resource;
if (!path.StartsWith("/"))
{
path = "/" + path;
}
canonicalStringList.AddLast(path);
canonicalStringList.AddLast(requestQuery);
canonicalStringList.AddLast("host:" + client.BaseUrl.Host);
canonicalStringList.AddLast("");
canonicalStringList.AddLast("host");
canonicalStringList.AddLast("UNSIGNED-PAYLOAD");
return(string.Join("\n", canonicalStringList));
}
public void Authenticate(RestSharp.IRestClient client, RestSharp.IRestRequest request)
{
request.AddHeader("Authorization", "Bearer " + _accessToken);
}
private void SetHostHeader(RestSharp.IRestRequest request, RestSharp.IRestClient client)
{
request.AddHeader("Host", client.BaseUrl.Host + (client.BaseUrl.Port != 80 ? ":" + client.BaseUrl.Port : string.Empty));
}
private static bool IsValidBaseUrl(RestSharp.IRestClient client, SDK.Http.IHttpRequest request)
{
return(request.CanonicalUri
.ToString()
.Contains(client.BaseUrl.ToString()));
}
