/// <summary>
/// Attempts to authenticate using OAuth and hydrate <see cref="AccessToken"/> and <see cref="RefreshToken"/>.
/// </summary>
/// <param name="clientId">The client id to authenticate against.</param>
/// <param name="clientSecret">The client secrete to authenticate with.</param>
/// <param name="redirectUri">The redirect uri if/when authenticate succeeds.</param>
/// <param name="authorizationCode">The authorization code.</param>
/// <returns>The empty task.</returns>
public async Task AuthenticateOAuthAsync(string clientId, string clientSecret, string redirectUri, string authorizationCode)
{
if (string.IsNullOrEmpty(clientId))
{
throw new ArgumentNullException($"{nameof(clientId)}");
}
if (string.IsNullOrEmpty(clientSecret))
{
throw new ArgumentNullException($"{nameof(clientSecret)}");
}
if (string.IsNullOrEmpty(redirectUri))
{
throw new ArgumentNullException($"{nameof(redirectUri)}");
}
if (string.IsNullOrEmpty(authorizationCode))
{
throw new ArgumentNullException($"{nameof(authorizationCode)}");
}
if (!UrlUtilities.CheckUri(redirectUri))
{
throw new ArgumentException($"Invalid {nameof(redirectUri)}");
}
var content = new FormUrlEncodedContent(new[]
{
new KeyValuePair <string, string>("client_id", clientId),
new KeyValuePair <string, string>("client_secret", clientSecret),
new KeyValuePair <string, string>("grant_type", "authorization_code"),
new KeyValuePair <string, string>("redirect_uri", redirectUri),
new KeyValuePair <string, string>("code", authorizationCode),
new KeyValuePair <string, string>("scope", "") // todo: implement scopes
});
var request = new HttpRequestMessage()
{
Method = HttpMethod.Post,
RequestUri = new Uri(OAuthTokenUrl),
Content = content
};
var responseMessage = await _httpClient.SendAsync(request).ConfigureAwait(false);
var response = await responseMessage.Content.ReadAsStringAsync().ConfigureAwait(false);
if (responseMessage.IsSuccessStatusCode)
{
var authToken = JsonConvert.DeserializeObject <AuthToken>(response);
AccessToken = authToken.access_token;
RefreshToken = authToken.refresh_token;
}
else
{
//TODO: Richer error handling
throw new Exception($"Error authenticating: \n {response}");
}
}