I have been using facebook api to share post on facebook page as facebook app. I have created facebook app.
The post also gets shared but the problem is, it is not being posted as a facebook app. Instead it asks user for login and then it shares post as a user. Any help regarding how could I share a post as a Facebook App would be appreciated as I have been trying this for a long time.
Thanx in advance friends.
The code that I have been using is as follows.
using Facebook;
protected void CheckAuthorization()
{
string authorizationCode = Request.QueryString["code"];
string access_token = Facebook_GetAccessToken(authorizationCode);
FacebookShare(access_token);
}
private string Facebook_GetAccessToken(string pAuthorizationCode)
{
string urlGetAccessToken = "https://graph.facebook.com/oauth/access_token";
urlGetAccessToken += "?client_id=my app id";
urlGetAccessToken += "&client_secret=app secret";
urlGetAccessToken += "&redirect_uri=" + Facebook_GetRedirectUri();
urlGetAccessToken += "&code=" + pAuthorizationCode;
string responseData = RequestResponse(urlGetAccessToken);
if (responseData == "")
{
return "";
}
NameValueCollection qs = HttpUtility.ParseQueryString(responseData);
string access_token = qs["access_token"] == null ? "" : qs["access_token"];
return access_token;
}
protected void FacebookShare(string token)
{
if (token != null)
{
Int64 transactionid = Convert.ToInt64(Cache["transactionid"]);
string app_id = "my app id";
string app_secret = "app secret";
string scope = "offline_access,read_stream,publish_actions,publish_stream,manage_pages,status_update";
dynamic parameters = new ExpandoObject();
parameters.link = "my website link";
parameters.name = "my project name";
parameters.picture= "my website logo";
var client = new FacebookClient(token);
client.Post("/1374775846180409/feed", parameters); // this is my facebook page id where I want to share post.
Response.Cookies["transaction"].Expires = DateTime.Now;
}
else
{
}
}
Regarding above code, I am getting Facebook Authorization code successfully.
You can only ask your user who has logged into your app to post on facebook, apps as such are not allowed to post.
You will need a page access token to post as the page, which have permissions to modify the data belonging to a Facebook Page. To obtain a page access token you need to start by obtaining a user access token, for which your user has to be logged into your app and asking for the manage_pages permission scope. Next, you can GET /me/accounts, which will return a page access token for each page that you manage.
This can not be accomplished using offline access or without logging in.
I need some help.
I don't no what to do after the user allows my application. On my pageLoad I verify if the URL has code(generated by Facebook) and redirect again with the string code to get the access token.
Facebook redirect again with the access token and now I have the token.
What is the next step?
...on pageload...
..........................
if (Request.QueryString["code"] != null && !Page.IsPostBack)
{
string code = Request.QueryString["code"];
string urlFinal = "https://graph.facebook.com/oauth/access_token?" +
"client_id=" + appID +
"&redirect_uri=" + redirectURL +
"&client_secret=" + appSecret +
"&code=" + code;
Response.Redirect(urlFinal);
}
else if (Request.QueryString["access_token"] != null)
string token = Request.QueryString["access_token"];
//AND NOW??
and redirect again with the string code to get the access token.
Don’t redirect to that address – it contains your app secret!
You should make a server-side call to that endpoint instead – as described in the authentication docs.
What is the next step?
That highly depends on what you want to do, don’t you think?
Let me put my code first
string strSigned = Request.Params["signed_request"];
// JSONObject obj = JSONObject.CreateFromString(strSigned);
Facebook.FacebookSignedRequest fb = FacebookSignedRequest.Parse(AppSecret, strSigned);
JsonObject jsonObj = fb.Data as JsonObject;
if (!jsonObj.ContainsKey("user_id"))
{
string appId = App_Id;
string redirectUrl = "http://127.0.0.1/Default.aspx"
string redirectstr = "https://www.facebook.com/dialog/oauth?client_id=" + appId + "&redirect_uri=" + redirectUrl + "&scope=email,read_stream";
Page.ClientScript.RegisterStartupScript(this.GetType(), "redirect", "<script>top.location.href='" +redirectstr +"'</script>");
Response.Clear();
}
else
{
Response.Write(jsonObj["user_id"].ToString());
}
Above code runs perfectly untill user press allow permissions.the application is actually redirecting to the mentioned redirect_uri http:... and not staying within facebook.
i am really bugged with this.let me know the solution.
It is made this way so that it can be used by external sites which accept facebook login.
The redirect_uri can be set to:
apps.facebook.com/myapp/
or
www.facebook.com/pageurl?sk=app_YOUR_APP_ID
along with external site url.
I am having a problem retrieving the user's access token after he/she has authorized my Facebook application to access their information and post for them, etc... Facebook returns a code query string to my website, so I can receive the access token for the user. I use the following code to get the access code.
string AppKey = "[REMOVED]";
string AppSecret = "[REMOVED]";
var oAuth = new Facebook.FacebookOAuthClient();
oAuth.AppId = AppKey;
oAuth.AppSecret = AppSecret;
oAuth.RedirectUri = new Uri("http://www.mywebsite.com");
Label3.Text = Request.QueryString["code"];
try
{
var accessToken = oAuth.ExchangeCodeForAccessToken(Request.QueryString["code"]);
string accessTokenString = accessToken.ToString();
HttpCookie aCookie = new HttpCookie("MyWebsite_FBAccessToken");
aCookie.Value = accessTokenString;
Response.Cookies.Add(aCookie);
Response.Redirect("~/Process/ProcessToken.aspx");
}
catch (Facebook.FacebookOAuthException error)
{
Label2.Text = error.Message;
}
My code gets held up here:
var accessToken = oAuth.ExchangeCodeForAccessToken(Request.QueryString["code"]);
And I receive the following error.
(OAuthException) Error validating verification code.
Does this seem like there is a problem with my code, or does it look like there may be a setting problem with my Facebook application? I know my App ID and Secret are correct.
I have this piece of code:
var settings = WebConfigurationManager.AppSettings;
var consumerKey = settings["Twitter.ConsumerKey"];
var consumerSecret = settings["Twitter.ConsumerSecret"];
var authToken = settings["Twitter.OAuthToken"];
var authVerifier = settings["Twitter.OAuthVerifier"];
//var accessToken = GetAccessToken(
// consumerKey, consumerSecret, authToken, string.Empty);
var tokens = new OAuthTokens()
{
AccessToken = authToken,
AccessTokenSecret = authVerifier,
ConsumerKey = consumerKey,
ConsumerSecret = consumerSecret
};
TwitterStatus.Update(tokens, txtComment.Text);
All I need it to to is update my twitter status. Unfortunately it is not working. It only worked once when I initially logged in to twitter to grant the application access. I then stored the authToken and authVerifier so I can reuse them for future updates.
Any idea what is wrong?
UPDATE: I just changed the code to :
TwitterResponse<TwitterStatus> tweetResponse = TwitterStatus.Update(tokens, txtComment.Text);
if (tweetResponse.Result == RequestResult.Success)
lblMessage.Text = "Twitter status successfully posted.";
else
lblMessage.Text = string.Format("Twitter status update failed with Error: '{0}'",
tweetResponse.ErrorMessage);
and I get an error message: "Invalid / expired token".
You are storing the wrong values. The authToken and verifier values need to be quickly exchanged for an access token using OAuthUtility.GetAccessToken(...). The access token that is returned from that method is what should be stored and supplied to Twitterizer.
-Ricky
The Twitterizer Author
I wanted to be able to make a simple status update from C#/.NET, but didn't want to embed a big library.
So I wrote a small OAuth.Manager class that does this stuff.
It's described here:
OAuth with Verification in .NET
Sample code to update status:
var oauth = new OAuth.Manager();
oauth["consumer_key"] = CONSUMER_KEY;
oauth["consumer_secret"] = CONSUMER_SECRET;
oauth["token"] = your_stored_access_token;
oauth["token_secret"] = your_stored_access_secret;
var url = "http://api.twitter.com/1/statuses/update.xml?status=Hello+World";
var authzHeader = oauth.GenerateAuthzHeader(url, "POST");
var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.Headers.Add("Authorization", authzHeader);
using (var response = (HttpWebResponse)request.GetResponse())
{
if (response.StatusCode != HttpStatusCode.OK)
MessageBox.Show("There's been a problem trying to tweet:" +
Environment.NewLine +
response.StatusDescription +
Environment.NewLine +
Environment.NewLine +
"You will have to tweet manually." +
Environment.NewLine);
}
For the first time through, you need to get an access token and secret. This is done in a multi-step process, starting with this code:
var oauth = new OAuth.Manager();
oauth["consumer_key"] = MY_APP_SPECIFIC_KEY;
oauth["consumer_secret"] = MY_APP_SPECIFIC_SECRET;
oauth.AcquireRequestToken("https://api.twitter.com/oauth/request_token", "POST");
Step 2 is to tell the user** to visit https://api.twitter.com/oauth/authorize?oauth_token=XXXX where xxxx is replaced with the actual token received, accessible in this case by oauth["token"]. Step 3 is to tell the user to grab (ctrl-c) the PIN from the webpage and paste it into your app, where you use the pin to get another type of token.
A better way is to automate that web UI sequence by using a Windows Form with an embedded WebBrowser control. When you set the Url property of that control to the appropriate value, it will show that webpage for you, inside the main form of your own app. You can also automate the part where you retrieve the PIN. This reduces context switches for your user and makes things simpler to understand.
Anyway, with the pin you do, step 4:
oauth.AcquireAccessToken("https://api.twitter.com/oauth/access_token",
"POST",
pin);
...which sends out another HTTP REST request, and when it returns you will have an accesss token and secret, available in oauth["token"] and oauth["token_secret"].
This authorization stuff with the web UI needs to happen only once; after you get the access token and secret once, you can store them and re-use them. They never expire, says Twitter.
You can then proceed to sending the status update...
var url = "http://api.twitter.com/1/statuses/update.xml?status=Hello+World";
var authzHeader = oauth.GenerateAuthzHeader(url, "POST");
...
...as above.
I know I am late to the game, but I created an end-to-end video tutorial showing exactly how to do this: I create an application on dev.twitter.com, install twitterizer using nuget, write the code to handle the oauth and finally write the code to use the access tokens received from twitter to make a tweet.
Video: http://www.youtube.com/watch?v=TGEA1sgMMqU
Tutorial: http://www.markhagan.me/Samples/Grant-Access-And-Tweet-As-Twitter-User-ASPNet
Code (in case you don't wan to leave this page):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Twitterizer;
namespace PostFansTwitter
{
public partial class twconnect : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
var oauth_consumer_key = "YOUR_CONSUMER_KEY_HERE";
var oauth_consumer_secret = "YOUR_CONSUMER_SECRET_KEY_HERE";
if (Request["oauth_token"] == null)
{
OAuthTokenResponse reqToken = OAuthUtility.GetRequestToken(
oauth_consumer_key,
oauth_consumer_secret,
Request.Url.AbsoluteUri);
Response.Redirect(string.Format("http://twitter.com/oauth/authorize?oauth_token={0}",
reqToken.Token));
}
else
{
string requestToken = Request["oauth_token"].ToString();
string pin = Request["oauth_verifier"].ToString();
var tokens = OAuthUtility.GetAccessToken(
oauth_consumer_key,
oauth_consumer_secret,
requestToken,
pin);
OAuthTokens accesstoken = new OAuthTokens()
{
AccessToken = tokens.Token,
AccessTokenSecret = tokens.TokenSecret,
ConsumerKey = oauth_consumer_key,
ConsumerSecret = oauth_consumer_secret
};
TwitterResponse<TwitterStatus> response = TwitterStatus.Update(
accesstoken,
"Testing!! It works (hopefully).");
if (response.Result == RequestResult.Success)
{
Response.Write("we did it!");
}
else
{
Response.Write("it's all bad.");
}
}
}
}
}