private async Task <ExpiringAccessToken> RefreshAccessToken(string oauthId)
{
var installationData = await GetInstallationDataAsync(oauthId);
var dataContent = new FormUrlEncodedContent(new[]
{
new KeyValuePair <string, string>("grant_type", "client_credentials"),
new KeyValuePair <string, string>("scope", "send_notification")
});
var credentials =
Encoding.ASCII.GetBytes(
$"{installationData.oauthId}:{installationData.oauthSecret}");
_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
Convert.ToBase64String(credentials));
var tokenResponse = await _httpClient.PostAsync(new Uri(installationData.tokenUrl),
dataContent);
var accessToken = JsonConvert.DeserializeObject <AccessToken>(await tokenResponse.Content.ReadAsStringAsync());
var expiringAccessToken = new ExpiringAccessToken
{
Token = accessToken,
ExpirationTimeStamp = DateTime.Now + TimeSpan.FromTicks((accessToken.expires_in - 60) * 1000)
};
await _database.StringSetAsync($"{oauthId}:token", JsonConvert.SerializeObject(expiringAccessToken));
return(expiringAccessToken);
}
private bool IsExpired(ExpiringAccessToken accessToken)
{
return(accessToken == null || accessToken.ExpirationTimeStamp < DateTime.Now);
}
