private static async Task <OAuthToken> PerformCodeExchange(string code, string codeVerifier, string redirectURI, string clientId, string clientSecret)
{
//Console.WriteLine("Exchanging code for tokens...");
// builds the request
string tokenRequestURI = "https://www.googleapis.com/oauth2/v4/token";
string tokenRequestBody = string.Format("code={0}&redirect_uri={1}&client_id={2}&code_verifier={3}&client_secret={4}&scope=&grant_type=authorization_code",
code,
Uri.EscapeDataString(redirectURI),
clientId,
codeVerifier,
clientSecret
);
// sends the request
HttpWebRequest tokenRequest = (HttpWebRequest)WebRequest.Create(tokenRequestURI);
tokenRequest.Method = "POST";
tokenRequest.ContentType = "application/x-www-form-urlencoded";
tokenRequest.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
byte[] byteVersion = Encoding.ASCII.GetBytes(tokenRequestBody);
tokenRequest.ContentLength = byteVersion.Length;
Stream stream = tokenRequest.GetRequestStream();
await stream.WriteAsync(byteVersion, 0, byteVersion.Length);
stream.Close();
// gets the response
WebResponse tokenResponse = await tokenRequest.GetResponseAsync();
using (StreamReader reader = new StreamReader(tokenResponse.GetResponseStream()))
{
// reads response body
string responseText = await reader.ReadToEndAsync();
//Console.WriteLine(responseText);
// converts to dictionary
Dictionary <string, string> tokenEndpointDecoded = serializer.DeserializeObject <Dictionary <string, string> >(responseText);
OAuthToken token = new OAuthToken();
token.accessToken = tokenEndpointDecoded["access_token"];
token.expiresIn = int.Parse(tokenEndpointDecoded["expires_in"]);
token.refreshToken = tokenEndpointDecoded["refresh_token"];
token.scope = tokenEndpointDecoded["scope"];
token.tokenType = tokenEndpointDecoded["token_type"];
token.idToken = tokenEndpointDecoded["id_token"];
return(token);
//UserinfoCall(access_token);
}
}
protected virtual T DeserializeObject <T>(string data)
{
return(serializer.DeserializeObject <T>(data));
}