public async Task EnsureAuthenticatedAsync()
{
var sessionStorageContainsToken = await SessionStorage.ContainKeyAsync(TokenSessionItem);
string authorizationCode = GetQueryParam("code");
var isAuthorizationCodeAvailable = authorizationCode != string.Empty;
if (!sessionStorageContainsToken && !isAuthorizationCodeAvailable)
{
var authorizationQueryParameters = new Dictionary <string, string>
{
{ "client_id", AuthConfig.ClientId },
{ "response_type", "code" },
{ "redirect_uri", NavigationManager.Uri },
{ "scope", AuthConfig.Scope },
};
NavigationManager.NavigateTo($"{AuthConfig.AuthorizationEndpoint}{await authorizationQueryParameters.ToQueryStringAsync()}");
}
else if (!sessionStorageContainsToken && isAuthorizationCodeAvailable)
{
var tokenParameters = new Dictionary <string, string>
{
{ "grant_type", "authorization_code" },
{ "code", authorizationCode },
{ "client_id", AuthConfig.ClientId },
{ "client_secret", AuthConfig.ClientSecret }
};
HttpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response = await HttpClient.PostAsync(AuthConfig.TokenEndpoint, new FormUrlEncodedContent(tokenParameters));
var token = await JsonSerializer.DeserializeAsync <Token>(await response.Content.ReadAsStreamAsync());
await SessionStorage.SetItemAsync(TokenSessionItem, token.AccessToken);
}
// TODO: here we could check if token is still valid (when sessionStorageContainsToken) and get new one otherwise
}
