/// <summary>
/// Get an access token for the Netatmo API.
/// </summary>
/// <param name="log">TraceWriter to log to</param>
/// <returns>string</returns>
private static async Task <string> GetAccessToken(TraceWriter log)
{
string accessToken = string.Empty;
// If we have a non-expired access token
if (HaveValidAccessToken(log))
{
accessToken = Environment.GetEnvironmentVariable(EnvNetatmoAccessToken);
}
else
{
NetatmoAccessToken tokenObject = null;
// Check if we have already received an initial token and need to only refresh
var needRefresh = Environment.GetEnvironmentVariable(EnvNetatmoAccessTokenRefreshAsNeeded);
if (string.IsNullOrEmpty(needRefresh) || !needRefresh.Equals("true"))
{
log.Info($"Getting a new access token...");
tokenObject = await GetNewAccessToken(log);
}
else
{
log.Info($"Refreshing the access token...");
tokenObject = await RefreshAccessToken(log);
}
if (tokenObject != null)
{
var now = DateTime.UtcNow;
var expiresAt = DateTime.UtcNow.AddSeconds(tokenObject.ExpiresIn);
Environment.SetEnvironmentVariable(EnvNetatmoAccessTokenRefreshAsNeeded, "true");
Environment.SetEnvironmentVariable(EnvNetatmoAccessToken, tokenObject.AccessToken);
Environment.SetEnvironmentVariable(EnvNetatmoAccessTokenExpiresAt, expiresAt.ToString());
Environment.SetEnvironmentVariable(EnvNetatmoRefreshToken, tokenObject.RefreshToken);
}
accessToken = tokenObject?.AccessToken;
}
return(accessToken);
}
/// <summary>
/// Refresh the access token for the Netatmo API
/// </summary>
/// <param name="log">TraceWriter to log to</param>
/// <returns>NetatmoAccessToken</returns>
private static async Task <NetatmoAccessToken> RefreshAccessToken(TraceWriter log)
{
NetatmoAccessToken accessToken = null;
using (var http = new HttpClient())
{
var clientId = Environment.GetEnvironmentVariable(EnvNetatmoClientId);
var parameters = new Dictionary <string, string>
{
{ "client_id", clientId },
{ "client_secret", Environment.GetEnvironmentVariable(EnvNetatmoClientSecret) },
{ "username", Environment.GetEnvironmentVariable(EnvNetatmoEmail) },
{ "password", Environment.GetEnvironmentVariable(EnvNetatmoPassword) },
{ "grant_type", "refresh_token" },
{ "scope", "read_station" },
{ "token_type", "bearer" },
{ "access_token", Environment.GetEnvironmentVariable(EnvNetatmoAccessToken) },
{ "refresh_token", Environment.GetEnvironmentVariable(EnvNetatmoRefreshToken) },
};
var request = new HttpRequestMessage(HttpMethod.Post, NetatmoUriAccessToken)
{
Content = new FormUrlEncodedContent(parameters)
};
var response = await http.SendAsync(request);
if (response.IsSuccessStatusCode)
{
var json = await response.Content.ReadAsStringAsync();
accessToken = NetatmoAccessToken.FromJson(json);
}
else
{
log.Error($"ERROR getting the access token: HTTP Status {response.StatusCode} - {response.ReasonPhrase}");
}
}
return(accessToken);
}
