Ejemplo n.º 1
0
        /// <summary>Decrypts data that was encrypted using machine key encryption</summary>
        /// <param name="value">The string to decrypt in URL encoded format</param>
        /// <returns>A decrypted string in UTF8 format</returns>
        public static string UnprotectString(string value)
        {
            if (string.IsNullOrEmpty(value))
            {
                return(null);
            }

            byte[] stream       = HttpServerUtility.UrlTokenDecode(value);
            byte[] decodedValue = MachineKey.Unprotect(stream);
            return(System.Text.Encoding.UTF8.GetString(decodedValue));
        }
Ejemplo n.º 2
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        /// <summary>
        ///     Accepts reset key. Used during forgot password.
        /// </summary>
        /// <param name="userId">  </param>
        /// <param name="resetKey"></param>
        /// <returns>Returns a validated AuthUser, or null if validation failed.</returns>
        public AuthUser ValidateReset(int userId, string resetKey)
        {
            AuthUser user = GetByIdForLogin(userId);

            if (user == null)
            {
                return(null);
            }
            byte[] keyBytes = HttpServerUtility.UrlTokenDecode(resetKey);
            return(IsValidResetKey(user, keyBytes) ? user : null);
        }
Ejemplo n.º 3
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        public async Task <IHttpActionResult> Blackhole(string indexerID, string path, string jackett_apikey, string file)
        {
            var jsonReply = new JObject();

            try
            {
                var indexer = indexerService.GetWebIndexer(indexerID);
                if (!indexer.IsConfigured)
                {
                    logger.Warn(string.Format("Rejected a request to {0} which is unconfigured.", indexer.DisplayName));
                    throw new Exception("This indexer is not configured.");
                }

                if (serverService.Config.APIKey != jackett_apikey)
                {
                    throw new Exception("Incorrect API key");
                }

                path = Encoding.UTF8.GetString(HttpServerUtility.UrlTokenDecode(path));
                path = protectionService.UnProtect(path);
                var remoteFile    = new Uri(path, UriKind.RelativeOrAbsolute);
                var downloadBytes = await indexer.Download(remoteFile);

                if (string.IsNullOrWhiteSpace(Engine.Server.Config.BlackholeDir))
                {
                    throw new Exception("Blackhole directory not set!");
                }

                if (!Directory.Exists(Engine.Server.Config.BlackholeDir))
                {
                    throw new Exception("Blackhole directory does not exist: " + Engine.Server.Config.BlackholeDir);
                }

                var fileName = DateTime.Now.Ticks.ToString() + "-" + StringUtil.MakeValidFileName(indexer.DisplayName, '_', false);
                if (string.IsNullOrWhiteSpace(file))
                {
                    fileName += ".torrent";
                }
                else
                {
                    fileName += "-" + StringUtil.MakeValidFileName(file, '_', false); // call MakeValidFileName() again to avoid any possibility of path traversal attacks
                }
                File.WriteAllBytes(Path.Combine(Engine.Server.Config.BlackholeDir, fileName), downloadBytes);
                jsonReply["result"] = "success";
            }
            catch (Exception ex)
            {
                logger.Error(ex, "Error downloading to blackhole " + indexerID + " " + path);
                jsonReply["result"] = "error";
                jsonReply["error"]  = ex.Message;
            }

            return(Json(jsonReply));
        }
Ejemplo n.º 4
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        public static string UnProtect(string text, string purpose)
        {
            if (string.IsNullOrEmpty(text))
            {
                return(string.Empty);
            }

            byte[] stream        = HttpServerUtility.UrlTokenDecode(text);
            byte[] decodedValues = MachineKey.Unprotect(stream, purpose);
            return(Encoding.UTF8.GetString(decodedValues));
        }
Ejemplo n.º 5
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 private static string DesprotecToken(string String)
 {
     try
     {
         var ByteSinProteccion = HttpServerUtility.UrlTokenDecode(String);
         return(Encoding.ASCII.GetString(ByteSinProteccion));
     }
     catch
     {
         return(null);
     }
 }
Ejemplo n.º 6
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        //-------------------------------------------------------------------------------------------------------------------------------------------------------------
        protected void Application_Error(Object sender, EventArgs e)
        {
            // 19-Jul-2015 - Get the error details when pages crash etc ...
            HttpException lastErrorWrapper = Server.GetLastError() as HttpException;

            if (lastErrorWrapper != null)
            {
                Exception lastError = lastErrorWrapper;
                if (lastErrorWrapper.InnerException != null)
                {
                    lastError = lastErrorWrapper.InnerException;
                }

                string lastErrorTypeName   = lastError.GetType().ToString();
                string lastErrorMessage    = lastError.Message;
                string lastErrorStackTrace = lastError.StackTrace;

                string currentPageOrResource = HttpContext.Current.Request.Url.ToString();

                // 5-Feb-2016 - getting a few errors with "This is an invalid webresource request".
                // According to this dude - http://www.telerik.com/blogs/debugging-asp-net-2-0-web-resources-decrypting-the-url-and-getting-the-resource-name
                // this could be due to dodgy requests and you can decrypte the d attribute to find out the specific resource
                string decryptedResource = "";
                try {
                    if (currentPageOrResource != null && currentPageOrResource.Contains("WebResource.axd") == true)
                    {
                        string dVal = currentPageOrResource.Split(new string[] { "WebResource.axd?d=" }, StringSplitOptions.None)[1];
                        dVal = dVal.Split(new string[] { "&" }, StringSplitOptions.None)[0];

                        byte[] encryptedData = HttpServerUtility.UrlTokenDecode(dVal);

                        Type       machineKeySection    = typeof(MachineKeySection);
                        Type[]     paramTypes           = new Type[] { typeof(bool), typeof(byte[]), typeof(byte[]), typeof(int), typeof(int) };
                        MethodInfo encryptOrDecryptData = machineKeySection.GetMethod("EncryptOrDecryptData", BindingFlags.Static | BindingFlags.NonPublic, null, paramTypes, null);

                        byte[] decryptedData = (byte[])encryptOrDecryptData.Invoke(null, new object[] { false, encryptedData, null, 0, encryptedData.Length });
                        decryptedResource = "(" + Encoding.UTF8.GetString(decryptedData) + ")";
                    }
                } catch (Exception exWebResource) {
                    // F**K it ...
                    decryptedResource = "(Couldn't decrypt the provided URL: " + exWebResource.ToString() + ")";
                }

                string errorString = "Server response crashed: " + lastErrorTypeName
                                     + "\n\nPage or resource:" + currentPageOrResource
                                     + decryptedResource
                                     + "\n\nDetails:" + lastErrorMessage
                                     + "\n\nStackTrace:" + lastErrorStackTrace;

                Logger.LogError(6, errorString);
                MGLApplicationInterface.Instance().LastError = errorString.Replace("\n\n", "<br /><br />");
            }
        }
Ejemplo n.º 7
0
 ///<summary>
 /// Decode Base64 encoded string with URL and Filename Safe Alphabet using UTF-8.
 ///</summary>
 ///<param name="str">Base64 code</param>
 ///<returns>The decoded string.</returns>
 public static string DecodificarUrlBase64(string str)
 {
     try
     {
         byte[] decbuff = HttpServerUtility.UrlTokenDecode(str);
         return(Encoding.GetEncoding(1252).GetString(decbuff));
     }
     catch (Exception ex2)
     {
         return(DecodificarBase64(str));
     }
 }
Ejemplo n.º 8
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 public static string Base64ForUrlDecode(string str)
 {
     if (!string.IsNullOrEmpty(str))
     {
         var decbuff = HttpServerUtility.UrlTokenDecode(str);
         if (decbuff != null)
         {
             return(Encoding.UTF8.GetString(decbuff));
         }
     }
     return(string.Empty);
 }
Ejemplo n.º 9
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        /// <summary>
        /// Decrypts the specified <paramref name="ticket" />.
        /// </summary>
        /// <param name="ticket">The ticket to decrypt.</param>
        /// <returns></returns>
        /// <exception cref="System.ArgumentNullException"></exception>
        public static AuthTicket Unprotect(string ticket)
        {
            if (ticket == null)
            {
                throw new ArgumentNullException(nameof(ticket));
            }
            var stream           = HttpServerUtility.UrlTokenDecode(ticket);
            var decodedValue     = MachineKey.Unprotect(stream, "project", "authentication");
            var decodedValueUtf8 = Encoding.UTF8.GetString(decodedValue);

            return(JsonConvert.DeserializeObject <AuthTicket>(decodedValueUtf8, JsonNetUtility.Settings));
        }
Ejemplo n.º 10
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 public string GetUserNameFromToken(string token)
 {
     try
     {
         var decodedToken = HttpServerUtility.UrlTokenDecode(token);
         return(_crypto.GetValueFromToken(decodedToken));
     }
     catch (FormatException)
     {
         return(null);
     }
 }
Ejemplo n.º 11
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 public static String Decrypt(String encryptedText)
 {
     try
     {
         var encryptedBytes = HttpServerUtility.UrlTokenDecode(encryptedText); //Convert.FromBase64String(encryptedText);
         return(Encoding.UTF8.GetString(Decrypt(encryptedBytes, GetRijndaelManaged(_key))));
     }
     catch
     {
         return(null);
     }
 }
Ejemplo n.º 12
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        /// <summary>
        /// Validates the request against XSRF attack.
        /// </summary>
        /// <param name="sessionId">The session id embedded in the query string.</param>
        /// <returns>
        ///   <c>true</c> if the request is safe. Otherwise, <c>false</c>.
        /// </returns>
        private bool ValidateRequestAgainstXsrfAttack(out string sessionId)
        {
            sessionId = null;

            // get the session id query string parameter
            string queryStringSessionId = this.requestContext.Request.QueryString[SessionIdQueryStringName];

            // verify that the query string value is a valid guid
            Guid guid;

            if (!Guid.TryParse(queryStringSessionId, out guid))
            {
                return(false);
            }

            // the cookie value should be the current username secured against this guid
            var cookie = this.requestContext.Request.Cookies[SessionIdCookieName];

            if (cookie == null || string.IsNullOrEmpty(cookie.Value))
            {
                return(false);
            }

            // extract the username embedded within the cookie
            // if there is any error at all (crypto, malformed, etc.), fail gracefully
            string usernameInCookie = null;

            try {
                byte[] encryptedCookieBytes = HttpServerUtility.UrlTokenDecode(cookie.Value);
                byte[] decryptedCookieBytes = MachineKeyUtil.Unprotect(encryptedCookieBytes, AntiXsrfPurposeString, "Token: " + queryStringSessionId);
                usernameInCookie = Encoding.UTF8.GetString(decryptedCookieBytes);
            }
            catch {
                return(false);
            }

            string currentUsername = GetUsername(this.requestContext);
            bool   successful      = string.Equals(currentUsername, usernameInCookie, StringComparison.OrdinalIgnoreCase);

            if (successful)
            {
                // be a good citizen, clean up cookie when the authentication succeeds
                var xsrfCookie = new HttpCookie(SessionIdCookieName, string.Empty)
                {
                    HttpOnly = true,
                    Expires  = DateTime.Now.AddYears(-1)
                };
                this.requestContext.Response.Cookies.Set(xsrfCookie);
            }

            sessionId = queryStringSessionId;
            return(successful);
        }
        public static string GetCookie(string key)
        {
            key = Prefix + key;
            if (HttpContext.Current.Request.Cookies[key] == null ||
                HttpContext.Current.Request.Cookies[key].Value == null)
            {
                return(null);
            }
            var decValue = HttpServerUtility.UrlTokenDecode(HttpContext.Current.Request.Cookies[key].Value);

            return(decValue != null?Encoding.UTF8.GetString(decValue) : "");
        }
Ejemplo n.º 14
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        private static string Unprotect(string text, string purpose)
        {
            if (string.IsNullOrEmpty(text))
            {
                return(null);
            }

            var stream       = HttpServerUtility.UrlTokenDecode(text);
            var decodedValue = MachineKey.Unprotect(stream, purpose);

            return(Encoding.UTF8.GetString(decodedValue));
        }
Ejemplo n.º 15
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        public override async Task GrantCustomExtension(OAuthGrantCustomExtensionContext context)
        {
            if (context.GrantType != "anonymous")
            {
                return;
            }

            var db = new KiwiContext();

            var protectedToken = HttpServerUtility.UrlTokenDecode(context.Parameters.Get("token"));

            if (protectedToken == null)
            {
                return;
            }

            var anonymousToken = Encoding.UTF8.GetString(MachineKey.Unprotect(protectedToken));

            var tokenArray = anonymousToken.Split('‼');

            var reportId = Int32.Parse(tokenArray[0]);
            var time     = DateTime.Parse(tokenArray[1]);

            if (tokenArray.Length != 2 && reportId != 0 && time != new DateTime())
            {
                context.SetError("invalid_grant", "This token is invalid");
                return;
            }

            if (time < DateTime.Now)
            {
                context.SetError("invalid_grant", "This token has expired");
                return;
            }

            if (await db.Reports.FindAsync(reportId) == null)
            {
                context.SetError("invalid_grant", "No report found with that ID");
                return;
            }

            var identity = new ClaimsIdentity(context.Options.AuthenticationType);

            identity.AddClaim(new Claim(ClaimTypes.Role, "Anonymous"));
            identity.AddClaim(new Claim("reportId", reportId.ToString()));
            identity.AddClaim(new Claim("is_anonymous", "true"));

            // token for reporting users should be valid for 10 minutes
            //context.Options.AccessTokenExpireTimeSpan = new TimeSpan(0, 10, 0);

            context.Validated(identity);
        }
Ejemplo n.º 16
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        public void ProcessRequest(HttpContext context)
        {
            context.PushRewritenUri();

            if (string.IsNullOrEmpty(context.Request["p"]))
            {
                _params = new Dictionary <string, string>(context.Request.QueryString.Count);
                //Form params and redirect
                foreach (var key in context.Request.QueryString.AllKeys)
                {
                    _params.Add(key, context.Request.QueryString[key]);
                }

                //Pack and redirect
                var uriBuilder = new UriBuilder(context.Request.GetUrlRewriter());
                var token      = HttpServerUtility.UrlTokenEncode(Encoding.UTF8.GetBytes(new JavaScriptSerializer().Serialize(_params)));
                uriBuilder.Query = "p=" + token;
                context.Response.Redirect(uriBuilder.Uri.ToString(), true);
            }
            else
            {
                _params = ((Dictionary <string, object>) new JavaScriptSerializer().DeserializeObject(
                               Encoding.UTF8.GetString(HttpServerUtility.UrlTokenDecode(context.Request["p"])))).ToDictionary(x => x.Key, y => (string)y.Value);
            }


            if (!string.IsNullOrEmpty(Auth))
            {
                try
                {
                    var profile = ProviderManager.Process(Auth, context, _params);
                    if (profile != null)
                    {
                        SendClientData(context, profile);
                    }
                }
                catch (ThreadAbortException)
                {
                    //Thats is responce ending
                }
                catch (Exception ex)
                {
                    SendClientData(context, LoginProfile.FromError(ex));
                }
            }
            else
            {
                //Render xrds
                RenderXrds(context);
            }
            context.PopRewritenUri();
        }
Ejemplo n.º 17
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        public async Task <HttpResponseMessage> Download(string indexerID, string path, string apikey, string file)
        {
            try
            {
                var indexer = indexerService.GetIndexer(indexerID);

                if (!indexer.IsConfigured)
                {
                    logger.Warn(string.Format("Rejected a request to {0} which is unconfigured.", indexer.DisplayName));
                    return(Request.CreateResponse(HttpStatusCode.Forbidden, "This indexer is not configured."));
                }

                path = Encoding.UTF8.GetString(HttpServerUtility.UrlTokenDecode(path));

                if (serverService.Config.APIKey != apikey)
                {
                    return(new HttpResponseMessage(HttpStatusCode.Unauthorized));
                }

                var target = new Uri(path, UriKind.RelativeOrAbsolute);
                target = indexer.UncleanLink(target);

                var downloadBytes = await indexer.Download(target);

                // This will fix torrents where the keys are not sorted, and thereby not supported by Sonarr.
                var torrentDictionary = BEncodedDictionary.DecodeTorrent(downloadBytes);
                downloadBytes = torrentDictionary.Encode();

                char[] invalidChars = System.IO.Path.GetInvalidFileNameChars();
                for (int i = 0; i < file.Count(); i++)
                {
                    if (invalidChars.Contains(file[i]))
                    {
                        file = file.Remove(i, 1).Insert(i, " ");
                    }
                }

                var result = new HttpResponseMessage(HttpStatusCode.OK);
                result.Content = new ByteArrayContent(downloadBytes);
                result.Content.Headers.ContentType        = new MediaTypeHeaderValue("application/x-bittorrent");
                result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
                {
                    FileName = file
                };
                return(result);
            }
            catch (Exception e)
            {
                logger.Error(e, "Error downloading " + indexerID + " " + path);
                return(new HttpResponseMessage(HttpStatusCode.NotFound));
            }
        }
Ejemplo n.º 18
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        public static byte[] FromBase64Url(this string rfc4648)
        {
            if (rfc4648.Length % 4 != 0)
            {
                rfc4648 += (4 - rfc4648.Length % 4);
            }
            else
            {
                rfc4648 += 0;
            }

            return(HttpServerUtility.UrlTokenDecode(rfc4648) ?? throw new InvalidOperationException());
        }
Ejemplo n.º 19
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        /// <summary>
        /// Decode an item from a url token.
        /// </summary>
        /// <typeparam name="T">The item type.</typeparam>
        /// <param name="token">The item token.</param>
        /// <returns>The item instance.</returns>
        public static T Decode <T>(string token)
        {
            var buffer = HttpServerUtility.UrlTokenDecode(token);

            using (var memory = new MemoryStream(buffer))
                using (var gzip = new GZipStream(memory, CompressionMode.Decompress))
                    using (var reader = new BsonReader(gzip))
                    {
                        var serializer = JsonSerializer.CreateDefault();
                        var item       = serializer.Deserialize <T>(reader);
                        return(item);
                    }
        }
Ejemplo n.º 20
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        public ActionResult SQLRemovePlan(string node, string handle)
        {
            var planHandle = HttpServerUtility.UrlTokenDecode(handle);
            var instance   = SQLInstance.Get(node);

            if (instance == null)
            {
                return(JsonError("Could not find server " + node));
            }
            var result = instance.RemovePlan(planHandle);

            return(result != 0 ? Json(true) : JsonError("There was an error removing the plan from cache"));
        }
Ejemplo n.º 21
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        public static Guid DecodeGuid(this string value)
        {
            value.AssertNotNull("value");

            var result = HttpServerUtility.UrlTokenDecode(value);

            if (result == null || result.Length != 16)
            {
                throw new BadRequestException("Value does not represent an ID: " + value + ", Result: " + result);
            }

            return(new Guid(result));
        }
Ejemplo n.º 22
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 public static int?Unprotect(string protectedText)
 {
     if (!String.IsNullOrEmpty(protectedText))
     {
         var protectedBytes = HttpServerUtility.UrlTokenDecode(protectedText);
         //var protectedBytes = Convert.FromBase64String(protectedText);
         var unprotectedBytes = MachineKey.Unprotect(protectedBytes, Purpose);
         var unprotectedText  = Encoding.UTF8.GetString(unprotectedBytes);
         var finalString      = unprotectedText.Substring(Secret1.Length, unprotectedText.Length - Secret2.Length - Secret1.Length);
         return(int.Parse(finalString));
     }
     return(null);
 }
        // String transformation helpers

        internal static string Base64ToHex(string base64)
        {
            StringBuilder builder = new StringBuilder((int)(base64.Length * 1.5));

            foreach (byte b in HttpServerUtility.UrlTokenDecode(base64))
            {
                builder.Append(HexDigit(b >> 4));
                builder.Append(HexDigit(b & 0x0F));
            }
            string result = builder.ToString();

            return(result);
        }
Ejemplo n.º 24
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        public static byte [] GetProtectedData(string strEncryptedText)
        {
            byte[] byteProtectedData = null;
            switch (enumPurpose)
            {
            case EnumPurpose.OWINCOOKIE:
                strEncryptedText = strEncryptedText.Replace('-', '+').Replace('_', '/');
                var padding = 3 - ((strEncryptedText.Length + 3) % 4);
                if (padding != 0)
                {
                    strEncryptedText = strEncryptedText + new string('=', padding);
                }
                byteProtectedData = Convert.FromBase64String(strEncryptedText);
                break;

            case EnumPurpose.OWINOAUTH:
                strEncryptedText = strEncryptedText.Replace('-', '+').Replace('_', '/');
                var padding1 = 3 - ((strEncryptedText.Length + 3) % 4);
                if (padding1 != 0)
                {
                    strEncryptedText = strEncryptedText + new string('=', padding1);
                }
                byteProtectedData = Convert.FromBase64String(strEncryptedText);
                break;

            case EnumPurpose.ASPXAUTH:
                byteProtectedData = CryptoUtil.HexToBinary(strEncryptedText);
                break;

            case EnumPurpose.WEBRESOURCE:
                byteProtectedData = HttpServerUtility.UrlTokenDecode(strEncryptedText);
                break;

            case EnumPurpose.SCRIPTRESOURCE:
                byteProtectedData = HttpServerUtility.UrlTokenDecode(strEncryptedText);
                break;

            case EnumPurpose.VIEWSTATE:
                byteProtectedData = System.Convert.FromBase64String(strEncryptedText);
                break;

            case EnumPurpose.UNKNOWN:
                byteProtectedData = null;
                break;

            default:
                byteProtectedData = null;
                break;
            }
            return(byteProtectedData);
        }
Ejemplo n.º 25
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        private String ConvertFromBase64(String text)
        {
            try
            {
                var bytes = HttpServerUtility.UrlTokenDecode(text);

                var @string = Encoding.UTF8.GetString(bytes);
                return(@string);
            }
            catch (Exception)
            {
                return(null);
            }
        }
Ejemplo n.º 26
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 public static string Decrypt(string cipherText, string Password)
 {
     try
     {
         byte[] cipherBytes      = HttpServerUtility.UrlTokenDecode(cipherText);
         PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
         byte[] decryptedData    = Decrypt(cipherBytes, pdb.GetBytes(32), pdb.GetBytes(16));
         return(System.Text.Encoding.Unicode.GetString(decryptedData));
     }
     catch
     {
         return(string.Empty);
     }
 }
Ejemplo n.º 27
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        public ActionResult TopDetail(string node, string handle, int?offset = null)
        {
            var planHandle = HttpServerUtility.UrlTokenDecode(handle);

            var i = SQLInstance.Get(node);

            var vd = new OperationsTopDetailModel
            {
                Instance = i,
                Op       = i.GetTopOperation(planHandle, offset).Data
            };

            return(View("Operations.Top.Detail", vd));
        }
Ejemplo n.º 28
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        /// <summary>
        /// Gets the token secret from the specified token.
        /// </summary>
        /// <param name="token">The token.</param>
        /// <returns>
        /// The token's secret
        /// </returns>
        public string GetTokenSecret(string token)
        {
            HttpCookie cookie = this.Context.Request.Cookies[TokenCookieKey];

            if (cookie == null || string.IsNullOrEmpty(cookie.Values[token]))
            {
                return(null);
            }
            byte[] cookieBytes = HttpServerUtility.UrlTokenDecode(cookie.Values[token]);
            byte[] clearBytes  = MachineKeyUtil.Unprotect(cookieBytes, TokenCookieKey, "Token:" + token);

            string secret = Encoding.UTF8.GetString(clearBytes);

            return(secret);
        }
Ejemplo n.º 29
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        public ActionResult TopPlan(string node, string handle)
        {
            var planHandle = HttpServerUtility.UrlTokenDecode(handle);
            var i          = SQLInstance.Get(node);
            var op         = i.GetTopOperation(planHandle).Data;

            if (op == null)
            {
                return(ContentNotFound("Plan was not found."));
            }

            var ms = new MemoryStream(Encoding.UTF8.GetBytes(op.QueryPlan));

            return(File(ms, "text/xml", $"QueryPlan-{Math.Abs(handle.GetHashCode())}.sqlplan"));
        }
Ejemplo n.º 30
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 private static T Read <T>(string signature, string secret, bool bUseSecret)
 {
     try
     {
         var payloadParts = Encoding.UTF8.GetString(HttpServerUtility.UrlTokenDecode(signature)).Split('?');
         if (false == bUseSecret || (GetHashBase64(payloadParts[1] + secret) == payloadParts[0]) || (GetHashBase64MD5(payloadParts[1] + secret) == payloadParts[0]))
         {
             return(new JavaScriptSerializer().Deserialize <T>(payloadParts[1]));
         }
     }
     catch (Exception)
     {
     }
     return(default(T));
 }