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Post message with Facebook SDK .NET

I have created a facebook page and a facebook application for my website and now I need to post messages onto the facebook page with help of facebook SDK .NET.
This is what I got so far :
public static bool UploadPost(string message)
{
dynamic result;
//https://developers.facebook.com/tools/explorer/
//https://developers.facebook.com/tools/access_token/
FacebookClient client = new FacebookClient("secret access token");
result = client.Get("oauth/access_token", new
{
client_id = "[Client ID number]",
client_secret = "[Client sercret",
grant_type = "client_credentials",
});
result = client.Post("[facebook app Id]/feed", new { message = "Test Message from app" });
//result.id;
result = client.Get("[facebook app Id]");
return false;
}
When running this I get : Additional information: (OAuthException - #200) (#200) The user hasn't authorized the application to perform this action on client.Post. If I remove the client.Post row every thing works good, the correct data is fetched.
I have tried follow some helps on facebook SDK .NET website but it is still not working.
The main problem now is that I get permission exception. I was hoping that my facebook app hade enouth permissions to publish post from my website to the facebook page.

Here is a step wise tutorial to register your application with facebook and get an app Id for your application.
Then for permissions ::
private const string ExtendedPermissions = "user_about_me,read_stream,publish_stream";
This is a string of permissions. Pass it on further for getting correct permissions to post messages on page. Post using your standard code for posting no FB pages.
Cheers. Hope it helps.

Are you trying to post to [facebook app id]?
I would recomend to post to "me/feed" and test if that works.
Also, to post to Facebook you have to have the publish_stream permission
private async Task Authenticate()
{
string message = String.Empty;
try
{
session = await App.FacebookSessionClient.LoginAsync("user_about_me,read_stream,publish_actions");
App.AccessToken = session.AccessToken;
App.FacebookId = session.FacebookId;
Dispatcher.BeginInvoke(() => NavigationService.Navigate(new Uri("/Pages/LandingPage.xaml", UriKind.Relative)));
}
catch (InvalidOperationException e)
{
message = "Login failed! Exception details: " + e.Message;
MessageBox.Show(message);
}
}
Should work :)

The following should work.
var fb = new FacebookClient("access_token");
fb.PostCompleted += (o, e) => {
if(e.Error == null) {
var result = (IDictionary<string, object>)e.GetResultData();
var newPostId = (string)result.id;
}
};
var parameters = new Dictionary<string, object>();
parameters["message"] = "My first wall post using Facebook SDK for .NET";
fb.PostAsync("me/feed", parameters);
This was taken directly from the documentation.

By creating a extended page token and use it to make the post everything works just fine. See this : How to get Page Access Token by code?
Im surprised that this simple task was so hard to get running and that there was vary little help to get.

Linq2Twitter Single User Authorisation Null Value Exception

I've been developing an internal ASP.NET web forms application for our business and one of the requirements is to display our Twitter feed on our portal home page to all users.
For this I've decided that it is best to use LinqToTwitter Single User Authorisation to get the statuses for everyone without them having to authenticate their own accounts.
My main problem at the minute is that when we use the auth object to get the TwitterContext, it returns with an error on the TwitterContext saying
Value cannot be null
on every internal context object.
I've gone through our twitter application settings at http://dev.twitter.com and I have our correct consumer key/token and access key/token. The permission for the application is set to Read-Only. There is no callback URL specified on the http://dev.twitter.com website as it is currently on our internal system (so it wouldn't be able to get back anyway). Is this where it is going wrong? Do I need to forward some ports and allow the callback to get through to our development machines?
Here's the code for prudence. As far as I can see, there is nothing wrong with it. I know that it is set to .FirstOrDefault, this was just for seeing whether it is actually getting anything (which it isn't).
Thanks for any help you can give! :)
private async Task GetTweets()
{
var auth = new SingleUserAuthorizer
{
CredentialStore = new SingleUserInMemoryCredentialStore
{
ConsumerKey = ConfigurationManager.AppSettings["consumerKey"],
ConsumerSecret = ConfigurationManager.AppSettings["consumerSecret"],
AccessToken = ConfigurationManager.AppSettings["accessToken"],
AccessTokenSecret = ConfigurationManager.AppSettings["accessTokenSecret"],
}
};
try
{
using (TwitterContext twitterContext = new TwitterContext(auth))
{
var searchResponse = await (from c in twitterContext.Status
where c.Type == StatusType.User
&& c.ScreenName == "my_screenname"
select c).ToListAsync();
Tb_home_news.Text = searchResponse.FirstOrDefault().Text;
}
}
catch (Exception ex)
{
Tb_home_news.Text = ex.Message;
}
}

If you're creating a Web app, you do need to add a URL to your Twitter App page. It isn't used for the callback, but might help avoid 401's in the future if you're using AspNetAuthorizer.
It looks like you have a NullReferenceException somewhere. What does ex.ToString() say?
Double check CredentialStore after initialization to make sure that all 4 credentials are populated. AccessToken and AccessTokenSecret come from your Twitter app page.
Does searchResponse contain any values? Calling FirstOrDefault on an empty collection will return null.

Instagram Login without oAuth

I am trying again to login to instagram, but i have to do this without using their api v2 which uses oAuth for verifying.
The only thing i have is Username and Password to login.
So what i did was looked for the way, instagram application for Android and hopefully IOS does that.
I see that it creates a request at the following url:
https://instagr.am/api/v1/accounts/login/
If you would visit that link directly, you will more likely get a error saying that the page couldn't be find. After a little bit of googling, i came across a 2 years old post which states that in the Useragent, we have to contain the string "Instagram" for it to work.
I did that by faking the useragent and the result is as follows:
{"status":"fail","message":"Your version of Instagram is out of date. Please upgrade your app in the Play Store to log in to Instagram."}
Now, i am guessing that we also need to add something else or some other headers too, so i was looking for a way to grab the request being sended to instagram by either of their Android or IOS app.
So next i downloaded Bluestack and installed and ran instagram on my computer using this. I was able to install and login it successfully, but then i was unable to log it using Charles since the request is being sent to https:// server
I also tried to grab it through Wireshark but unfortuantely, i am not much experienced in using it and hence don't know it purpose.
So could anyone help me to get how to login to instagram with C# without using oAuth, cuz i just have username and password.
I would probably code the end part of requesting myself, but i am unable to capture the headers being sent to instagram.
Also, if there is anything like Charles/Wireshark which captures network traffic for Android, do let me know about it too.

You should be able to capture the request and see the request headers using Fiddler if you can tell your device to use your pcs internet connection by going through USB. It seems your getting close but might just need a version number somewhere in your request.

Yeah you can do this using Webview
Here you go
mWebView.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
UrlQuerySanitizer.ValueSanitizer sanitizer = UrlQuerySanitizer.getAllButNulLegal();
// remember to decide if you want the first or last parameter with the same name
// If you want the first call setPreferFirstRepeatedParameter(true);
sanitizer.sanitize(url);
String value = sanitizer.sanitize("username"); // get your value
if(MyBridge.getUsername()!=null)username = MyBridge.getUsername();
return true;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
// showLoading();
CookieManager.getInstance().removeAllCookies(null);
// CookieManager.getInstance().flush();
progressBar.setVisibility(View.VISIBLE);
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressBar.setVisibility(View.GONE);
if (url.equalsIgnoreCase(mURL)) {
view.addJavascriptInterface(new MyBridge(InstagramOfficalLoginActivity.this), "bridge");
String javascript = "javascript: document.getElementsByClassName(\"_0mzm- sqdOP L3NKy \")[0].onclick = function() {\n" +
" var username = document.getElementsByName(\"username\").value;\n" +
" var password = document.getElementsByName(\"password\").value;\n" +
" bridge.saveData(username, password);\n" +
" };";
view.loadUrl(javascript);
}
if (isSessionid ) {
// username = MyBridge.getUsername();
//сохранение данных пользователя
Logins logins = new Logins();
logins.setUserId(InstaUtils.getUserId());
logins.setUserName("");
logins.setProfilePic("");
logins.setSession_id(InstaUtils.getSessionid());
logins.setCooki(InstaUtils.getCookies());
logins.setCsrf(InstaUtils.getCsrf());
long id = DataObjectRepositry.dataObjectRepositry.addNewUser(logins);
PreferencesManager.savePref(GlobalConstant.USERNAME,username);
PreferencesManager.savePref(GlobalConstant.USER_ID, InstaUtils.getUserId());
PreferencesManager.savePref(GlobalConstant.TOKEN, InstaUtils.getSessionid());
PreferencesManager.savePref(GlobalConstant.PROFILE_PIC,"");
Intent intent = new Intent(InstagramOfficalLoginActivity.this, MainActivity.class);
PreferencesManager.savePref("isLogin",true);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra("user", InstaUtils.getUserId());
intent.putExtra("database_id",String.valueOf(id));
mWebView.destroy();
mWebView = null;
startActivity(intent);
}
}
#Override
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
progressBar.setVisibility(View.GONE);
cookies = CookieManager.getInstance().getCookie(url);
try {
String session_id = getCookie(url, "sessionid");
String csrftoken = getCookie(url, "csrftoken");
String userid = getCookie(url, "ds_user_id");
if (session_id != null && csrftoken != null && userid != null) {
isSessionid = true;
InstaUtils.setSessionId(session_id);
InstaUtils.setUserId(userid);
InstaUtils.setCookies(cookies);
InstaUtils.setCsrf(csrftoken, cookies);
}
}catch (Exception e){
e.printStackTrace();
}
}
#SuppressWarnings("deprecation")
#Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
ToastUtils.ErrorToast(InstagramOfficalLoginActivity.this, description);
}
#TargetApi(android.os.Build.VERSION_CODES.M)
#Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
// Redirect to deprecated method, so you can use it in all SDK versions
onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
}
});
mWebView.loadUrl(mURL);
You can also download fully working code from my github profile Here is the link.
I hope it work,Thanks :)

you can always login through https://instagram.com/accounts/login/ having only login\password.
having ability to sniff traffic will not help you, as they sign all their messages now to prevent things you are trying to achieve.

You can find Instaguser library at here. https://github.com/ThinhVu/InstagramUser
Instaguser allow you login into instagram without OAuth.
At the moment, you can change user information: username, biography, ... etc.

Authenticate using openID without login through provider

I create web application to connect to MySpace Offsite App and I want to authenticate I used the following code
var openid = new OpenIdRelyingParty();
IAuthenticationRequest request = openid.CreateRequest("http://www.myspace.com/thabet084");
request.AddExtension(new OAuthRequest("ConsumerKey"));
request.RedirectToProvider();
var response = openid.GetResponse();
OAuthResponse oauthExtension = new OAuthResponse();
if (response != null)
{
switch (response.Status)
{
case AuthenticationStatus.Authenticated:
oauthExtension = response.GetExtension<OAuthResponse>();
var user_authorized_request_token = oauthExtension.RequestToken;
break;
}
}
OffsiteContext context = new OffsiteContext("ConsumerKey", "ConsumerSecret");
var accessToken = (AccessToken)context.GetAccessToken(oauthExtension.RequestToken, "", "");
and I used the following refrences DotNetOpenAuth.dll and MySpaceID.SDK.dll
My problems are:
I always found that responce=null
I don't need user to login through provider MySpace so i need to remove RedirectToProvider();
My application in brief is to send status from mywebsite to MySpace account Just click on button to send
All ideas are welcome
BR,
Mohammed Thabet Zaky

If you don't want to authenticate the user then OpenID isn't what you want at all. In fact, OAuth probably isn't either. If you just want to send the user to MySpace to confirm a status message, you can very likely do that with just a crafted URL the way Twitter does -- no special protocol or library required at all.

Test Credentials to access a web page

Is there a nice and tested piece of code out there that I can use for this purpose:
get the user/pass and the address of a web service (asmx page) and check if the user/pass are valid or not.
I think I should use HTTPRequest,etc to do that but I do not have a good knowledge on that topic , causing my current method to not working properly.
If there is a good piece of code for this purpose I appreciate for pointing me to that.
Thanks
P.S: I am not using DefaultCredentials in my code. Since I want them to enter user/pass so now I need to be able to TEST their user/pass and show proper message to them if their credentials is not valid.

You can use the HttpWebRequest.Credentials Property (depends on the web service authentication) and the CredentialCache Class.
Also some code examples (from google):
Retrieving HTTP content in .NET
Combine Invoking Web Service dynamically using HttpWebRequest with .Credentials.

public bool TestCredentials(string url, string username, string password)
{
var web = new WebClient();
web.Credentials = new NetworkCredential(username,password);
try
{
web.DownloadData(url);
return true;
}
catch (WebException ex)
{
var response = (HttpWebResponse)ex.Response;
if (response.StatusCode == HttpStatusCode.Unauthorized)
{
return false;
}
throw;
}
}