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POC# help required to Create Facebook AppSecret_Proof HMACSHA256
 

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    <p>Facebook requires that I create a appsecret_proof: <a href="https://developers.facebook.com/docs/graph-api/securing-requests" rel="noreferrer">https://developers.facebook.com/docs/graph-api/securing-requests</a></p> <p>And I have done this using the following code:</p> <pre><code>public string FaceBookSecret(string content, string key) { var encoding = new System.Text.ASCIIEncoding(); byte[] keyByte = encoding.GetBytes(key); byte[] messageBytes = encoding.GetBytes(content); using (var hmacsha256 = new HMACSHA256(keyByte)) { byte[] hashmessage = hmacsha256.ComputeHash(messageBytes); return Convert.ToBase64String(hashmessage); } } </code></pre> <p>Everything looks fine for me, however facebook says that the appsecret_proof is invalid. I am logged in, I can do everything as normal when i remove the key. So to save some time:</p> <ul> <li>Yes I am posting to the correct URL</li> <li>Yes I am passing a valid access_token</li> <li>Yes I am using the same access_token in the proof, as i am in the request</li> <li>Yes my appsecret is fine, and works</li> </ul> <p>Example in usage</p> <pre><code>dynamic results = client.Post("/" + model.PostAsId + "/feed", new { message = model.Message, appsecret_proof = FaceBookSecret(postAs.AuthToken, AppSecret) }); </code></pre> <p>I think it probably has something to do with encoding or something along them lines, but to be honest, I just dont know.</p> <p>I am also using the Facebook .net SDK however this does not have much in documentation, and does not seem to strike on anything to do with automation, server side operations etc.</p> <p>Thanks</p>
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    1. COcan you show more code please - how do you create `client`? Are you sure you are using same app.Id for both hash and request? Also - try `Encoding.UTF8.GetBytes` just in case - may be that will do the trick...
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