/// <summary>
/// Requests a new token as specified in
/// https://developers.google.com/accounts/docs/OAuth2ServiceAccount#makingrequest.
/// </summary>
/// <param name="taskCancellationToken">Cancellation token to cancel operation.</param>
/// <returns><c>true</c> if a new token was received successfully.</returns>
public override async Task<bool> RequestAccessTokenAsync(CancellationToken taskCancellationToken)
{
string serializedHeader = CreateSerializedHeader();
string serializedPayload = GetSerializedPayload();
StringBuilder assertion = new StringBuilder();
assertion.Append(UrlSafeBase64Encode(serializedHeader))
.Append(".")
.Append(UrlSafeBase64Encode(serializedPayload));
// Sign the header and the payload.
var signature = UrlSafeBase64Encode(key.SignData(Encoding.ASCII.GetBytes(assertion.ToString()), "SHA256"));
assertion.Append(".").Append(signature);
// Create the request.
var request = new GoogleAssertionTokenRequest()
{
Assertion = assertion.ToString()
};
Logger.Debug("Request a new access token. Assertion data is: " + request.Assertion);
var newToken = await request.ExecuteAsync(HttpClient, TokenServerUrl, taskCancellationToken, Clock)
.ConfigureAwait(false);
Token = newToken;
return true;
}
/// <summary>
/// Requests a new token as specified in
/// https://developers.google.com/accounts/docs/OAuth2ServiceAccount#makingrequest.
/// </summary>
/// <param name="taskCancellationToken">Cancellation token to cancel operation.</param>
/// <returns><c>true</c> if a new token was received successfully.</returns>
public override async Task<bool> RequestAccessTokenAsync(CancellationToken taskCancellationToken)
{
// Create the request.
var request = new GoogleAssertionTokenRequest()
{
Assertion = CreateAssertionFromPayload(CreatePayload())
};
Logger.Debug("Request a new access token. Assertion data is: " + request.Assertion);
var newToken = await request.ExecuteAsync(HttpClient, TokenServerUrl, taskCancellationToken, Clock)
.ConfigureAwait(false);
Token = newToken;
return true;
}