/// <summary>
/// Performs a POST Logout request, ending the current session.
/// </summary>
public async Task LogoutAsync()
{
if (Cookies == null)
{
return;
}
try
{
await ServiceLayerRoot.AppendPathSegment("Logout").WithCookies(Cookies).PostAsync();
_loginResponse = new SLLoginResponse();
_lastRequest = default;
Cookies = null;
}
catch (FlurlHttpException ex)
{
try
{
if (ex.Call.HttpResponseMessage == null)
{
throw;
}
var response = await ex.GetResponseJsonAsync <SLResponseError>();
throw new SLException(response.Error.Message.Value, response.Error, ex);
}
catch { throw ex; }
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SLConnection"/> class.
/// Only one instance per company/user should be used in the application.
/// </summary>
/// <param name="serviceLayerRoot">
/// The Service Layer root URI. The expected format is https://[server]:[port]/b1s/[version]
/// </param>
/// <param name="companyDB">
/// The Company database (schema) to connect to.
/// </param>
/// <param name="userName">
/// The SAP user to be used for the Service Layer authentication.
/// </param>
/// <param name="password">
/// The password for the provided user.
/// </param>
/// <param name="language">
/// The language code to be used. Specify a code if you want error messages in some specific language other than English.
/// A GET request to the UserLanguages resource will return all available languages and their respective codes.
/// </param>
/// <param name="numberOfAttempts">
/// The number of attempts for each request in case of an HTTP response code of 401, 500, 502, 503 or 504.
/// If the response code is 401 (Unauthorized), a login request will be performed before the new attempt.
/// </param>
public SLConnection(Uri serviceLayerRoot, string companyDB, string userName, string password, int?language = null, int numberOfAttempts = 3)
{
if (string.IsNullOrWhiteSpace(companyDB))
{
throw new ArgumentException("companyDB can not be empty.");
}
if (string.IsNullOrWhiteSpace(userName))
{
throw new ArgumentException("userName can not be empty.");
}
if (string.IsNullOrWhiteSpace(password))
{
throw new ArgumentException("password can not be empty.");
}
ServiceLayerRoot = serviceLayerRoot;
CompanyDB = companyDB;
UserName = userName;
Password = password;
Language = language;
NumberOfAttempts = numberOfAttempts;
LoginResponse = new SLLoginResponse();
}
/// <summary>
/// Performs the POST Login request to the Service Layer.
/// </summary>
/// <param name="forceLogin">
/// Whether the login request should be forced even if the current session has not expired.
/// </param>
/// <param name="expectReturn">
/// Wheter the login information should be returned.
/// </param>
private async Task <SLLoginResponse> ExecuteLoginAsync(bool forceLogin = false, bool expectReturn = false)
{
// Prevents multiple login requests in a multi-threaded scenario
await _semaphoreSlim.WaitAsync();
try
{
if (forceLogin)
{
_lastRequest = default;
}
// Session still valid, no need to login again
if (DateTime.Now.Subtract(_lastRequest).TotalMinutes < _loginResponse.SessionTimeout)
{
return(expectReturn ? LoginResponse : null);
}
var loginResponse = await ServiceLayerRoot
.AppendPathSegment("Login")
.WithCookies(out var cookieJar)
.PostJsonAsync(new { CompanyDB, UserName, Password, Language })
.ReceiveJson <SLLoginResponse>();
Cookies = cookieJar;
_loginResponse = loginResponse;
_loginResponse.LastLogin = DateTime.Now;
return(expectReturn ? LoginResponse : null);
}
catch (FlurlHttpException ex)
{
try
{
if (ex.Call.HttpResponseMessage == null)
{
throw;
}
var response = await ex.GetResponseJsonAsync <SLResponseError>();
throw new SLException(response.Error.Message.Value, response.Error, ex);
}
catch { throw ex; }
}
finally
{
_semaphoreSlim.Release();
}
}
