public async Task <string> GetAccessToken()
{
AuthenticationResult result;
// If there is no saved user account, the user must sign-in
if (this.userAccount == null)
{
try
{
// Invoke device code flow so user can sign-in with a browser
result = await this.msalClient.AcquireTokenWithDeviceCode(
this.scopes,
callback =>
{
NonBlockingLogger.Info(callback.Message);
return(Task.CompletedTask);
}).ExecuteAsync();
this.userAccount = result.Account;
return(result.AccessToken);
}
catch (Exception exception)
{
NonBlockingLogger.Error($"Error getting access token: {exception.Message}");
return(null);
}
}
// If there is an account, call AcquireTokenSilent
// By doing this, MSAL will refresh the token automatically if
// it is expired. Otherwise it returns the cached token.
result = await this.msalClient.AcquireTokenSilent(this.scopes, this.userAccount).ExecuteAsync();
return(result.AccessToken);
}
public async Task SendMailToAsync(string mailAdress, string subject, string messageBody)
{
try
{
Message message = new Message
{
Subject = subject,
Body = new ItemBody {
ContentType = BodyType.Text, Content = messageBody
},
ToRecipients = new List <Recipient> {
new Recipient {
EmailAddress = new EmailAddress {
Address = mailAdress
}
}
},
Sender = new Recipient {
EmailAddress = new EmailAddress {
Address = this.fromMailAddress, Name = this.fromName
}
},
From = new Recipient {
EmailAddress = new EmailAddress {
Address = this.fromMailAddress, Name = this.fromName
}
}
};
await this.graphServiceClient.Me.SendMail(message).Request().PostAsync();
}
catch (Exception e)
{
NonBlockingLogger.Error($"{e.Message}\nStacktrace: {e.StackTrace}");
}
}
private static void HandleException(Exception exception)
{
NonBlockingLogger.Error($"Unhandled exception occured: {exception.Message}\nStacktrace: {exception.StackTrace}");
}