/// <summary>
/// Requests an access token
/// </summary>
/// <returns>The access token.</returns>
private async Task <string> RequestAccessTokenAsync()
{
_logger.LogTrace("Generate a signed JWT.");
var jwtSecurityToken = _jwtGenerator.GenerateSignedJWT();
var accessTokenUri = $@"oauth2/v1/token?grant_type=client_credentials&scope={string.Join("+", Configuration.Scopes)}&client_assertion_type=urn:ietf:params:oauth:client-assertion-type:jwt-bearer&client_assertion={jwtSecurityToken.ToString()}";
_logger.LogTrace("Request an access token.");
var request = new HttpRequestMessage(HttpMethod.Post, accessTokenUri)
{
Content = new FormUrlEncodedContent(new Dictionary <string, string>())
};
using (var response = await _httpClient.SendAsync(request).ConfigureAwait(false))
{
if (response == null || response.Content == null)
{
throw new InvalidOperationException("The access token response from the server was null.");
}
var responseContent = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
var data = new DefaultSerializer().Deserialize(responseContent);
if ((int)response.StatusCode < 200 || (int)response.StatusCode >= 300)
{
throw new OktaOAuthException((int)response.StatusCode, _resourceFactory.CreateNew <OAuthApiError>(data));
}
if (!data.ContainsKey("access_token"))
{
throw new MissingFieldException("Access token not found");
}
return(data["access_token"].ToString());
}
}