/// <summary>
/// Gets the canvas login url
/// </summary>
/// <param name="returnUrlPath">
/// The return Url Path.
/// </param>
/// <param name="cancelUrlPath">
/// The cancel Url Path.
/// </param>
/// <param name="state">
/// The state.
/// </param>
/// <param name="loginParameters">
/// The parameters.
/// </param>
/// <returns>
/// Returns the login url.
/// </returns>
public Uri GetLoginUrl(string returnUrlPath, string cancelUrlPath, string state, IDictionary <string, object> loginParameters)
{
Contract.Ensures(Contract.Result <Uri>() != null);
var oauth = new FacebookOAuthClient
{
AppId = _settings.AppId
};
var oauthJsonState = PrepareCanvasLoginUrlOAuthState(returnUrlPath, cancelUrlPath, state, loginParameters);
var oauthState = FacebookUtils.Base64UrlEncode(Encoding.UTF8.GetBytes(oauthJsonState.ToString()));
var mergedLoginParameters = FacebookUtils.Merge(loginParameters, null);
mergedLoginParameters["state"] = oauthState;
var appPath = _httpRequest.ApplicationPath;
if (appPath != "/")
{
appPath = string.Concat(appPath, "/");
}
string redirectRoot = RedirectPath;
var uriBuilder = new UriBuilder(CurrentCanvasUrl)
{
Path = string.Concat(appPath, redirectRoot),
Query = string.Empty
};
oauth.RedirectUri = uriBuilder.Uri;
var loginUrl = oauth.GetLoginUrl(mergedLoginParameters);
return(loginUrl);
}