protected void Page_Load(object sender, EventArgs e)
{
CurrentMaster.Title.TitleText = GetString("socialnetworking.facebook.accesstoken");
lblStatus.Style.Add(HtmlTextWriterStyle.TextAlign, "center");
lblStatus.Style.Add(HtmlTextWriterStyle.MarginTop, "230px");
// Load data from settings
string currentSite = CMSContext.CurrentSiteName;
string apiKey = QueryHelper.GetString("apiKey", String.Empty);
string apiSecret = QueryHelper.GetString("appSecret", String.Empty);
string pageId = QueryHelper.GetString("pageId", String.Empty);
string textboxId = QueryHelper.GetString("textbox", String.Empty);
string lblId = QueryHelper.GetString("lblId", String.Empty);
string redirectUrl = URLHelper.GetAbsoluteUrl(FacebookProvider.REDIRECT_URL) + "?textbox=" + textboxId + "&apiKey=" + apiKey + "&appSecret=" + apiSecret + "&pageId=" + pageId + "&lblId=" + lblId;
redirectUrl = HttpContext.Current.Server.UrlEncode(redirectUrl);
string code = QueryHelper.GetString("code", String.Empty);
if (!String.IsNullOrEmpty(code))
{
// Second request on this site, already with code parameter
WebClient wc = new WebClient();
string request = String.Format(FacebookProvider.OAUTH_ACCESS_TOKEN_URL, apiKey, redirectUrl, apiSecret, code);
try
{
string accessToken = wc.DownloadString(request);
DateTime expiration = new DateTime();
bool expirationSet = false;
// Get values from response
string[] pairs = accessToken.Split('&');
foreach (var pair in pairs)
{
string[] keyValue = pair.Split('=');
if (keyValue[0].CompareTo("access_token") == 0)
{
accessToken = keyValue[1];
}
else if (keyValue[0].CompareTo("expires") == 0)
{
expiration = DateTime.Now + TimeSpan.FromSeconds(Convert.ToInt32(keyValue[1]));
expirationSet = true;
}
}
// Get page access token - posting will be done under page identity
string pageAccessToken = FacebookProvider.GetPageAccessToken(accessToken, pageId);
// Check if page access token was retrieved correctly
if (pageAccessToken == null)
{
lblStatus.Text = GetString("socialnetworking.facebook.pageaccesstokenfail");
}
else
{
// Set retrieved access token to appropriate setting box
StringBuilder sb = new StringBuilder("if(wopener.setAccessTokenToTextBox){wopener.setAccessTokenToTextBox('")
.AppendFormat("{0}', '{1}', '{2}', '{3}', '{4}'); CloseDialog();}}", textboxId, pageAccessToken, expirationSet ? expiration.ToString("g", CultureHelper.PreferredUICultureInfo) : "", lblId, expirationSet ? expiration.ToString() : "");
ScriptHelper.RegisterStartupScript(Page, typeof(string), "TokenScript", ScriptHelper.GetScript(sb.ToString()));
}
}
catch (WebException ex)
{
// Log exception
EventLogProvider ev = new EventLogProvider();
ev.LogEvent("FacebookAccessToken", "Retrieval", ex);
// Show exception message
lblStatus.Text = GetString("socialnetworking.facebook.connectionfail") + ex.Message;
}
}
else
{
// First time on this page - need to ask Facebook for code - will get redirected back as soon as user confirms permissions
Response.Redirect(String.Format(FacebookProvider.OAUTH_AUTHORIZE_URL, apiKey, redirectUrl), true);
}
}