/// <summary>
/// Makes a POST request to the Facebook API. If the <code>AccessToken</code> property has
/// been specified, the access token will be appended to the query string.
/// </summary>
/// <param name="url">The URL to call.</param>
/// <param name="query">The query string of the request.</param>
/// <param name="postData">The POST data.</param>
/// <param name="isMultipart">If <code>true</code>, the content type of the request will be <code>multipart/form-data</code>, otherwise <code>application/x-www-form-urlencoded</code>.</param>
/// <returns>Returns an instance of <code>SocialHttpResponse</code> wrapping the response from the Facebook Graph API.</returns>
public SocialHttpResponse DoAuthenticatedPostRequest(string url, SocialQueryString query, SocialPostData postData, bool isMultipart) {
// Throw an exception if the URL is empty
if (String.IsNullOrWhiteSpace(url)) throw new ArgumentNullException("url");
// Append the HTTP scheme and API version if not already specified.
if (url.StartsWith("/")) {
url = "https://graph.facebook.com" + (String.IsNullOrWhiteSpace(Version) ? "" : "/" + Version) + url;
}
// Initialize a new instance of SocialQueryString if the one specified is NULL
if (query == null) query = new SocialQueryString();
// Append the access token to the query string if present in the client and not already
// specified in the query string
if (!query.ContainsKey("access_token") && !String.IsNullOrWhiteSpace(AccessToken)) {
query.Add("access_token", AccessToken);
}
// Append the query string to the URL
if (!query.IsEmpty) url += (url.Contains("?") ? "&" : "?") + query;
// Initialize a new HTTP request
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
// Set the HTTP method
request.Method = "POST";
// Write the POST data to the request stream
if (postData != null && postData.Count > 0) {
if (isMultipart) {
string boundary = Guid.NewGuid().ToString().Replace("-", "");
request.ContentType = "multipart/form-data; boundary=" + boundary;
using (Stream stream = request.GetRequestStream()) {
postData.WriteMultipartFormData(stream, boundary);
}
} else {
string dataString = postData.ToString();
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = dataString.Length;
using (Stream stream = request.GetRequestStream()) {
stream.Write(Encoding.UTF8.GetBytes(dataString), 0, dataString.Length);
}
}
}
// Get the HTTP response
try {
return SocialHttpResponse.GetFromWebResponse(request.GetResponse() as HttpWebResponse);
} catch (WebException ex) {
if (ex.Status != WebExceptionStatus.ProtocolError) throw;
return SocialHttpResponse.GetFromWebResponse(ex.Response as HttpWebResponse);
}
}
