private bool _TryGetCachedSession()
{
if (!_settings.HasSessionInfo)
{
HasCachedSessionInfo = false;
return(false);
}
// Properties are gotten from _settings.
_facebookApi = new FacebookWebApi(ApplicationKey, SessionKey, UserId, SessionSecret);
HasCachedSessionInfo = true;
return(true);
}
/// <summary>Get the URI to host in a WebBrowser to allow a Facebook user to log into this application.</summary>
/// <param name="authenticationToken"></param>
/// <returns></returns>
public Uri GetLoginUri(string successUri, string deniedUri, IEnumerable <Permissions> requiredPermissions)
{
return(FacebookWebApi.GetLoginUri(ApplicationKey, successUri, deniedUri, requiredPermissions));
}
/// <summary>
/// Start a new session by connecting to Facebook.
/// </summary>
/// <param name="authenticationToken">The authentication token to use.</param>
public void InitiateNewSession(Uri sessionResponse)
{
string sessionPrefix = "session=";
var badSessionInfoException = new ArgumentException("The session response does not contain connection information.", "sessionResponse");
Verify.IsNotNull(sessionResponse, "sessionResponse");
if (!string.IsNullOrEmpty(SessionKey))
{
throw new InvalidOperationException("This object already has a session.");
}
string jsonSessionInfo = sessionResponse.Query;
jsonSessionInfo = Utility.UrlDecode(jsonSessionInfo);
int startIndex = jsonSessionInfo.IndexOf(sessionPrefix);
if (-1 == startIndex)
{
throw badSessionInfoException;
}
jsonSessionInfo = jsonSessionInfo.Substring(startIndex + sessionPrefix.Length);
if (jsonSessionInfo.Length == 0 || jsonSessionInfo[0] != '{')
{
throw badSessionInfoException;
}
int curlyCount = 1;
for (int i = 1; i < jsonSessionInfo.Length; ++i)
{
if (jsonSessionInfo[i] == '{')
{
++curlyCount;
}
if (jsonSessionInfo[i] == '}')
{
--curlyCount;
}
if (curlyCount == 0)
{
jsonSessionInfo = jsonSessionInfo.Substring(0, i + 1);
break;
}
}
if (curlyCount != 0)
{
throw badSessionInfoException;
}
var serializer = new JsonSerializer(typeof(object));
var sessionMap = (IDictionary <string, object>)serializer.Deserialize(jsonSessionInfo);
object sessionKey;
object userId;
object secret;
if (!sessionMap.TryGetValue("session_key", out sessionKey) ||
!sessionMap.TryGetValue("uid", out userId) ||
!sessionMap.TryGetValue("secret", out secret) ||
string.IsNullOrEmpty(sessionKey.ToString()) ||
string.IsNullOrEmpty(userId.ToString()) ||
string.IsNullOrEmpty(secret.ToString()))
{
throw badSessionInfoException;
}
_settings.SetSessionInfo(sessionKey.ToString(), secret.ToString(), new FacebookObjectId(userId.ToString()));
_settings.Save();
_facebookApi = new FacebookWebApi(ApplicationKey, SessionKey, UserId, SessionSecret);
HasCachedSessionInfo = true;
}
