public static async Task <OAuthAuthorization> TryLoadExistingAuthorizationAsync(
IAuthAdapter oauthAdapter,
CancellationToken token)
{
var existingTokenResponse = await oauthAdapter
.GetStoredRefreshTokenAsync(token)
.ConfigureAwait(false);
if (oauthAdapter.IsRefreshTokenValid(existingTokenResponse))
{
TraceSources.Common.TraceVerbose("Found existing credentials");
var scopesOfExistingTokenResponse = existingTokenResponse.Scope.Split(' ');
if (!scopesOfExistingTokenResponse.ContainsAll(oauthAdapter.Scopes))
{
TraceSources.Common.TraceVerbose(
"Dropping existing credential as it lacks one or more scopes");
// The existing auth might be fine, but it lacks a scope.
// Delete it so that it does not cause harm later.
await oauthAdapter.DeleteStoredRefreshToken().ConfigureAwait(false);
return(null);
}
else
{
var credential = oauthAdapter.AuthorizeUsingRefreshToken(existingTokenResponse);
var userInfo = await oauthAdapter.QueryUserInfoAsync(
credential,
token).ConfigureAwait(false);
return(new OAuthAuthorization(
oauthAdapter,
credential,
userInfo));
}
}
else
{
return(null);
}
}
