/// <summary>
/// Get a facebook access token
/// </summary>
/// <param name="domain">A reference to the current domain</param>
/// <param name="code">The code to exchange for an acess token</param>
/// <returns>The access token as a string</returns>
public async static Task<string> GetFacebookAccessToken(Domain domain, string code)
{
// Create a string to get the access token
string accessString = "";
// Create the url
string url = "https://graph.facebook.com/oauth/access_token?client_id=" + domain.facebook_app_id + "&redirect_uri="
+ HttpContext.Current.Server.UrlEncode(domain.web_address + "/user/facebook_login_callback") + "&client_secret="
+ domain.facebook_app_secret + "&code=" + code;
// Create a http client
HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
// Get the post
HttpResponseMessage response = await client.GetAsync(url);
// Make sure that the response is successful
if (response.IsSuccessStatusCode)
{
accessString = await response.Content.ReadAsStringAsync();
}
// Dispose of the client
client.Dispose();
// Convert the string to a json object
JObject token = AnnytabDataValidation.GetJsonObject(accessString);
// Get the access token
string access_token = token != null ? AnnytabDataValidation.GetJsonString(token["access_token"]) : "";
// Return the access token
return access_token;
} // End of the GetFacebookAccessToken method