protected void InitializeAuthenticationResponse(AuthenticationResponse response)
{
response.AccessToken.YammerContext = this;
response.Network.YammerContext = this;
response.User.YammerContext = this;
}
public void EnsureAuthenticated()
{
// is the authentication toek empty or in an error state?
if (String.IsNullOrEmpty(this.AuthToken) || this.AuthTokenIsError)
{
String code = this.Context.Request["code"];
if (code == null)
{
String url = this.Context.Request.Url.ToString();
int lastCode = url.LastIndexOf("?code=");
if (lastCode > 0)
{
code = url.Substring(lastCode + 6);
}
}
// have we received an initial authenticate code from Yammer? If so, validate it and use it.
if (code != null)
{
this.AccessCode = code as String;
// prepare to call Yammer to get a valid authentication token given our code & secret.
String url = String.Format(YammerOAuthValidatorUrl, this.ClientId, this.ClientSecret, this.AccessCode);
HttpWebRequest hwr = WebRequest.CreateHttp(url);
WebResponse wr = hwr.GetResponse();
using (Stream s = wr.GetResponseStream())
{
// deserialize the result.
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(AuthenticationResponse), this.Settings);
this.authenticationResponse = serializer.ReadObject(s) as AuthenticationResponse;
this.InitializeAuthenticationResponse(this.authenticationResponse);
// if we have a valid result, so keep going.
if (this.authenticationResponse != null)
{
this.AuthTokenIsError = false;
// let's persist this in session state.
this.AuthenticationResponseSessionStorage = this.AuthenticationResponseAsString;
this.AuthToken = this.AuthenticationResponse.AccessToken.Token;
if (this.Context.User != null && this.PersistTokensInDatabase)
{
this.SaveAuthenticationResponseToken(this.Context.User.Identity.Name);
}
}
}
}
else
{
// we don't seem to have an active token
if (this.Context.User != null && !this.AuthTokenIsError)
{
// can we load a token from the database for this user?
if (!this.ForceRefreshToken && this.LoadAuthenticationResponseToken(this.Context.User.Identity.Name) && this.PersistTokensInDatabase)
{
this.AuthenticationResponseSessionStorage = this.AuthenticationResponseAsString;
this.AuthToken = this.AuthenticationResponse.AccessToken.Token;
// great, we loaded a token, let's return.
return;
}
}
// no token available to us, so start the redirection process over to Yammer to kick off the OAuth flow.
String url = String.Format(YammerOAuthUrl, this.ClientId, this.Context.Request.Url);
this.Context.Response.Redirect(url);
}
}
}
protected void InitializeAuthenticationResponse(AuthenticationResponse response)
{
response.AccessToken.YammerContext = this;
response.Network.YammerContext = this;
response.User.YammerContext = this;
}
