GSF.ServiceProcess.ServiceHelper.TransferFile C# (CSharp) Method

        private void TransferFile(ClientRequestInfo requestInfo)
        {
            if (requestInfo.Request.Arguments.ContainsHelpRequest || requestInfo.Request.Arguments.OrderedArgCount < 2)
            {
                StringBuilder helpMessage = new StringBuilder();

                helpMessage.Append("Transfers files to and from the server.");
                helpMessage.AppendLine();
                helpMessage.AppendLine();
                helpMessage.Append("   Usage:");
                helpMessage.AppendLine();
                helpMessage.Append("       Transfer \"Source File Path\" \"Target File Path\" -options");
                helpMessage.AppendLine();
                helpMessage.AppendLine();
                helpMessage.Append("   Options:");
                helpMessage.AppendLine();
                helpMessage.Append("       -?".PadRight(20));
                helpMessage.Append("Displays this help message");
                helpMessage.AppendLine();
                helpMessage.Append("       -upload".PadRight(20));
                helpMessage.Append("Uploads file from local machine to server");
                helpMessage.AppendLine();
                helpMessage.Append("       -download".PadRight(20));
                helpMessage.Append("Downloads file from server to local machine");
                helpMessage.AppendLine();
                helpMessage.Append("       -overwrite".PadRight(20));
                helpMessage.Append("Overwrites file if one exists in the target location");
                helpMessage.AppendLine();
                helpMessage.AppendLine();

                UpdateStatus(requestInfo.Sender.ClientID, UpdateType.Information, helpMessage.ToString());
            }
            else
            {
                string source = requestInfo.Request.Arguments["orderedarg1"];
                string target = requestInfo.Request.Arguments["orderedarg2"];
                bool upload = requestInfo.Request.Arguments.Exists("upload");
                bool download = requestInfo.Request.Arguments.Exists("download");
                bool overwrite = requestInfo.Request.Arguments.Exists("overwrite");

                if (upload)
                {
                    // Request is for uploading a file.
                    if (requestInfo.Request.Attachments.Count == 1)
                    {
                        // File content is present.
                        target = FilePath.GetAbsolutePath(target);

                        if (!File.Exists(target) || overwrite)
                        {
                            // Save the received file.
                            UpdateStatus(requestInfo.Sender.ClientID, UpdateType.Information, "Saving file '{0}'...\r\n\r\n", target);
                            File.WriteAllBytes(target, (byte[])requestInfo.Request.Attachments[0]);
                            UpdateStatus(requestInfo.Sender.ClientID, UpdateType.Information, "File '{0}' saved successfully.\r\n\r\n", target);
                        }
                        else
                        {
                            // File exists and cannot be overwritten.
                            UpdateStatus(UpdateType.Alarm, "File '{0}' already exists.\r\n\r\n", target);
                        }
                    }
                    else
                    {
                        // File content is not present.
                        UpdateStatus(UpdateType.Alarm, "Content for file '{0}' is missing.\r\n\r\n", target);
                    }
                }
                else if (download)
                {
                    // Request is for uploading a file.
                    source = FilePath.GetAbsolutePath(source);

                    if (File.Exists(source))
                    {
                        // Send file to client.
                        UpdateStatus(requestInfo.Sender.ClientID, UpdateType.Information, "Sending file '{0}'...\r\n\r\n", source);
                        SendActionableResponse(requestInfo, true, File.ReadAllBytes(source));
                        UpdateStatus(requestInfo.Sender.ClientID, UpdateType.Information, "File '{0}' sent successfully.\r\n\r\n", source);
                    }
                    else
                    {
                        // File does not exist.
                        UpdateStatus(UpdateType.Alarm, "File '{0}' does not exist.\r\n\r\n", source);
                    }
                }
                else
                {
                    // Invalid command option specified.
                    UpdateStatus(UpdateType.Alarm, "Command option is not valid.\r\n\r\n");
                }
            }
        }