private async Task <string> GetAccessToken()
{
await accessTokenSem.WaitAsync();
var tokens = await tokenStorage.Get();
if (!tokens.Expired)
{
accessTokenSem.Release();
return(tokens.AccessToken);
}
else if (tokens.HasRefreshToken)
{
try
{
var dict = new Dictionary <string, string>
{
{ "client_id", clientId },
{ "client_secret", clientSecret },
{ "grant_type", "refresh_token" },
{ "refresh_token", tokens.RefreshToken }
};
var res = await new System.Net.Http.HttpClient().PostAsync($"{authorizationUrl}/connect/token",
new FormUrlEncodedContent(dict));
if (res.IsSuccessStatusCode)
{
var str = await res.Content.ReadAsStringAsync();
var token = JsonConvert.DeserializeObject <TokenResponse>(str);
tokens = new StoredTokens()
{
AccessToken = token.access_token,
RefreshToken = token.refresh_token,
AccessTokenExpires = DateTime.Now.AddSeconds(token.expires_in)
};
await tokenStorage.Store(tokens);
return(tokens.AccessToken);
}
else
{
throw new UnauthorizedException("Could not redeem refresh token.");
}
}
finally
{
accessTokenSem.Release();
}
}
else
{
accessTokenSem.Release();
throw new UnauthorizedException("No valid access or refresh token configured.");
}
}
