ImgurScreenshotUploader.cs

/// <summary>
/// Uploads an image to Imgur
///
/// Credit: http://answers.unity3d.com/questions/1151550/how-can-i-upload-a-screenshot-directly-to-imgur.html 
/// </summary>
public class ImgurScreenshotUploader {

    /// <summary>
    /// Blocking call that uploads an image and returns the results of the API call. 
    /// Results can be inspected to get the URL of the newly uploaded image, or the error code 
    /// if one occurred. 
    /// </summary>
    /// <param name="rawImage">Raw bytes of a PNG or JPG file</param>
    /// <returns>Returns the results of the API endpoint as a raw string</returns>
    public static string Upload (byte[] rawImage) {

        // Before we try uploading it to Imgur we need a Server Certificate Validation Callback
        ServicePointManager.ServerCertificateValidationCallback = MyRemoteCertificateValidationCallback;

        var values = new NameValueCollection() { { "image", Convert.ToBase64String(rawImage) }, { "type", "base64" } };

        // Here's a version for using the commercial Imgur endpoint (Mashape.com)
        using (var w = new WebClient()) {
            w.Headers.Add("X-Mashape-Key", "XXXXXXXXXXXXXXXXX");  // <---- FILL IN YOUR MASHAPE KEY
            w.Headers.Add("Authorization", "Client-ID XXXXXXX");  // <---- FILL IN YOUR CLIENT ID
            byte[] response = w.UploadValues("https://imgur-apiv3.p.mashape.com/3/image", values);
            string str = UTF8Encoding.UTF8.GetString(response);
            Debug.Log(str);
            return str;
        }

        //// And here's the version for uploading to the free Imgur API endpoint:
        //
        // using (var w = new WebClient()) {
        //    w.Headers.Add("Authorization", "Client-ID XXXXXXX");  // <---- FILL IN YOUR CLIENT ID
        //    byte[] response = w.UploadValues("https://api.imgur.com/3/image.xml", values);
        //    Debug.Log(XDocument.Load(new MemoryStream(response)));
        //    return UTF8Encoding.UTF8.GetString(response);
        // }
    }

    private static bool MyRemoteCertificateValidationCallback (System.Object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) {
        bool isOk = true;

        // If there are errors in the certificate chain, look at each error to determine the cause.
        if (sslPolicyErrors != SslPolicyErrors.None) {
            for (int i = 0; i < chain.ChainStatus.Length; i++) {
                if (chain.ChainStatus[i].Status != X509ChainStatusFlags.RevocationStatusUnknown) {
                    chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EntireChain;
                    chain.ChainPolicy.RevocationMode = X509RevocationMode.Online;
                    chain.ChainPolicy.UrlRetrievalTimeout = new TimeSpan(0, 1, 0);
                    chain.ChainPolicy.VerificationFlags = X509VerificationFlags.AllFlags;
                    bool chainIsValid = chain.Build((X509Certificate2)certificate);
                    if (!chainIsValid) {
                        isOk = false;
                    }
                }
            }
        }
        return isOk;
    }
}