Added DownloadManager for the server (NOT DONE YET!)

Server/DownloadManager.cs

@@ -0,0 +1,101 @@
+using System.IO;
+using System.Linq;
+using System.Collections.Generic;
+
+namespace CoopServer
+{
+    internal class DownloadManager
+    {
+        const int MAX_BUFFER = 1048576; // 1MB
+
+        // Key = Nethandle
+        // Value = List of Files
+        private Dictionary<long, List<DownloadFile>> _files = new();
+
+        public void Create(long nethandle)
+        {
+            if (!DirectoryAndFilesExists())
+            {
+                return;
+            }
+
+            List<DownloadFile> files = new();
+
+            foreach (string file in Directory.GetFiles("clientside"))
+            {
+                FileInfo fileInfo = new(file);
+
+                // ONLY JAVASCRIPT AND JSON FILES!
+                if (!new string[] { ".js", ".json" }.Any(x => x == fileInfo.Extension))
+                {
+                    Logging.Error("Only files with \"*.js\" and \"*.json\" can be sent!");
+                    continue;
+                }
+
+                Logging.Debug($"===== {fileInfo.Name} =====");
+
+                byte[] buffer = new byte[MAX_BUFFER];
+                int bytesRead = 0;
+                bool fileCreated = false;
+                DownloadFile newFile = null;
+                byte fileCount = 0;
+
+                using (FileStream fs = File.Open(file, FileMode.Open, FileAccess.Read))
+                using (BufferedStream bs = new(fs))
+                {
+                    while ((bytesRead = bs.Read(buffer, 0, MAX_BUFFER)) != 0) // Reading 1MB chunks at time
+                    {
+                        if (!fileCreated)
+                        {
+                            newFile = new() { FileID = fileCount, FileName = fileInfo.Name, FileLength = fileInfo.Length };
+                            fileCreated = true;
+                        }
+
+                        newFile.AddData(buffer);
+
+                        Logging.Debug($"{bytesRead}");
+                    }
+                }
+
+                files.Add(newFile);
+            }
+
+            _files.Add(nethandle, files);
+        }
+
+        private bool DirectoryAndFilesExists()
+        {
+            if (!Directory.Exists("clientside") || Directory.GetFiles("clientside").Length == 0)
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+
+    internal class DownloadFile
+    {
+        public int FileID { get; set; }
+        public string FileName { get; set; }
+        public long FileLength { get; set; }
+
+        private List<byte[]> _data = new();
+        private long _sent = 0;
+
+        public void Upload()
+        {
+            // TODO
+        }
+
+        public void AddData(byte[] data)
+        {
+            _data.Add(data);
+        }
+
+        public bool DownloadFinished()
+        {
+            return _sent >= FileLength;
+        }
+    }
+}