/// <summary>
/// This function extracts access_token from the response returned from web authentication broker
/// and uses that token to get user information using facebook graph api.
/// </summary>
/// <param name="responseData">responseData returned from AuthenticateAsync result.</param>
private async Task GetFacebookUserNameAsync(string responseData)
{
var decoder = new WwwFormUrlDecoder(responseData);
var error = decoder.TryGetValue("error");
if (error != null)
{
FacebookUserName.Text = $"Error: {error}";
return;
}
// You can store access token locally for further use.
string access_token = decoder[0].Value;
this.fb_token = decoder[0].Value;
string expires_in = decoder.TryGetValue("expires_in"); // expires_in is optional
Windows.Web.Http.HttpClient httpClient = new Windows.Web.Http.HttpClient();
Uri uri = new Uri($"https://graph.facebook.com/me?fields=id,name,picture,birthday&access_token={Uri.EscapeDataString(access_token)}");
HttpGetStringResult result = await httpClient.TryGetStringAsync(uri);
if (result.Succeeded)
{
Windows.Data.Json.JsonObject userInfo = Windows.Data.Json.JsonObject.Parse(result.Value).GetObject();
FacebookUserName.Text = userInfo.GetNamedString("name");
this.userID = userInfo.GetNamedString("id");
}
else
{
FacebookUserName.Text = "Error contacting Facebook";
}
Windows.Web.Http.HttpClient httpClient2 = new Windows.Web.Http.HttpClient();
Uri uri2 = new Uri($"https://graph.facebook.com/{this.userID}/accounts?fields=name,access_token&access_token={this.fb_token}");
HttpGetStringResult myresult = await httpClient.TryGetStringAsync(uri2);
if (myresult.Succeeded)
{
Windows.Data.Json.JsonObject userInfo2 = Windows.Data.Json.JsonObject.Parse(myresult.Value).GetObject();
this.Page_token = userInfo2["data"].GetArray()[0].GetObject().GetNamedString("access_token");
}
else
{
Debug.Write("man ta osso!");
}
Windows.Web.Http.HttpClient httpClient3 = new Windows.Web.Http.HttpClient();
Uri uri3 = new Uri($"https://graph.facebook.com/{this.userID}/accounts?access_token={this.fb_token}");
HttpGetStringResult result3 = await httpClient.TryGetStringAsync(uri3);
if (result3.Succeeded)
{
Windows.Data.Json.JsonObject userInfo = Windows.Data.Json.JsonObject.Parse(result3.Value).GetObject();
this.PageId = userInfo["data"].GetArray()[0].GetObject().GetNamedString("id");
}
else
{
FacebookUserName.Text = "Error contacting Facebook";
}
}