Teknik/Teknik/Areas/Upload/Controllers/UploadController.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Teknik.Areas.Error.ViewModels;
using Teknik.Areas.Upload.Models;
using Teknik.Areas.Upload.ViewModels;
using Teknik.Controllers;
using Teknik.Helpers;
using Teknik.Models;

namespace Teknik.Areas.Upload.Controllers
{
    public class UploadController : DefaultController
    {
        private TeknikEntities db = new TeknikEntities();

        // GET: Upload/Upload
        [HttpGet]
        [AllowAnonymous]
        public ActionResult Index()
        {
            ViewBag.Title = "Teknik Upload - End to End Encryption";
            UploadViewModel model = new UploadViewModel();
            Areas.Profile.Models.User user = db.Users.Where(u => u.Username == User.Identity.Name).FirstOrDefault();
            if (user != null)
            {
                model.SaveKey = user.UploadSettings.SaveKey;
                model.ServerSideEncrypt = user.UploadSettings.ServerSideEncrypt;
            }
            else
            {
                model.SaveKey = true;
                model.ServerSideEncrypt = true;
            }
            return View(model);
        }

        [HttpPost]
        [AllowAnonymous]
        public ActionResult Upload(string fileType, string fileExt, string iv, int keySize, int blockSize, bool encrypt, bool saveKey, HttpPostedFileWrapper data, string key = null)
        {
            if (Config.UploadConfig.UploadEnabled)
            {
                if (data.ContentLength <= Config.UploadConfig.MaxUploadSize)
                {
                    // convert file to bytes
                    byte[] fileData = null;
                    int contentLength = data.ContentLength;
                    using (var binaryReader = new BinaryReader(data.InputStream))
                    {
                        fileData = binaryReader.ReadBytes(data.ContentLength);
                    }
                    // if they want us to encrypt it, we do so here
                    if (encrypt)
                    {
                        // Generate key and iv if empty
                        if (string.IsNullOrEmpty(key))
                        {
                            key = Utility.RandomString(keySize / 8);
                        }

                        fileData = AES.Encrypt(fileData, key, iv);
                        if (fileData == null || fileData.Length <= 0)
                        {
                            return Json(new { error = new { message = "Unable to encrypt file" } });
                        }
                    }
                    Models.Upload upload = Uploader.SaveFile(fileData, fileType, contentLength, fileExt, iv, (saveKey) ? key : null, keySize, blockSize);
                    if (upload != null)
                    {
                        if (User.Identity.IsAuthenticated)
                        {
                            Profile.Models.User user = db.Users.Where(u => u.Username == User.Identity.Name).FirstOrDefault();
                            if (user != null)
                            {
                                upload.UserId = user.UserId;
                                db.Entry(upload).State = EntityState.Modified;
                                db.SaveChanges();
                            }
                        }
                        return Json(new { result = new { name = upload.Url, url = Url.SubRouteUrl("u", "Upload.Download", new { file = upload.Url }), key = key } }, "text/plain");
                    }
                    return Json(new { error = "Unable to upload file" });
                }
                else
                {
                    return Json(new { error = "File Too Large" });
                }
            }
            return Json(new { error = "Uploads are disabled" });
        }

        // User did not supply key
        [HttpGet]
        [AllowAnonymous]
        public ActionResult Download(string file)
        {
            if (Config.UploadConfig.DownloadEnabled)
            {
                ViewBag.Title = "Teknik Download - " + file;
                Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
                if (upload != null)
                {
                    upload.Downloads += 1;
                    db.Entry(upload).State = EntityState.Modified;
                    db.SaveChanges();

                    // We don't have the key, so we need to decrypt it client side
                    if (string.IsNullOrEmpty(upload.Key) && !string.IsNullOrEmpty(upload.IV))
                    {
                        DownloadViewModel model = new DownloadViewModel();
                        model.FileName = file;
                        model.ContentType = upload.ContentType;
                        model.ContentLength = upload.ContentLength;
                        model.IV = upload.IV;

                        return View(model);
                    }
                    else // We have the key, so that means server side decryption
                    {
                        string subDir = upload.FileName[0].ToString();
                        string filePath = Path.Combine(Config.UploadConfig.UploadDirectory, subDir, upload.FileName);
                        if (System.IO.File.Exists(filePath))
                        {
                            // Read in the file
                            byte[] data = System.IO.File.ReadAllBytes(filePath);
                            // If the IV is set, and Key is set, then decrypt it
                            if (!string.IsNullOrEmpty(upload.Key) && !string.IsNullOrEmpty(upload.IV))
                            {
                                // Decrypt the data
                                data = AES.Decrypt(data, upload.Key, upload.IV);
                            }

                            // Create content disposition
                            var cd = new System.Net.Mime.ContentDisposition
                            {
                                FileName = upload.Url,
                                Inline = true
                            };

                            Response.AppendHeader("Content-Disposition", cd.ToString());

                            return File(data, upload.ContentType);
                        }
                    }
                }
                return Redirect(Url.SubRouteUrl("error", "Error.Http404"));
            }
            return Redirect(Url.SubRouteUrl("error", "Error.Http403"));
        }

        [HttpPost]
        [AllowAnonymous]
        public FileResult DownloadData(string file)
        {
            if (Config.UploadConfig.DownloadEnabled)
            {
                Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
                if (upload != null)
                {
                    string subDir = upload.FileName[0].ToString();
                    string filePath = Path.Combine(Config.UploadConfig.UploadDirectory, subDir, upload.FileName);
                    if (System.IO.File.Exists(filePath))
                    {
                        byte[] buffer;
                        FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                        try
                        {
                            int length = (int)fileStream.Length;  // get file length
                            buffer = new byte[length];            // create buffer
                            int count;                            // actual number of bytes read
                            int sum = 0;                          // total number of bytes read

                            // read until Read method returns 0 (end of the stream has been reached)
                            while ((count = fileStream.Read(buffer, sum, length - sum)) > 0)
                                sum += count;  // sum is a buffer offset for next reading
                        }
                        finally
                        {
                            fileStream.Close();
                        }
                        return File(buffer, System.Net.Mime.MediaTypeNames.Application.Octet, file);
                    }
                }
                Redirect(Url.SubRouteUrl("error", "Error.Http404"));
                return null;
            }
            Redirect(Url.SubRouteUrl("error", "Error.Http403"));
            return null;
        }

        [HttpGet]
        [AllowAnonymous]
        public ActionResult Delete(string file, string key)
        {
            ViewBag.Title = "File Delete - " + file + " - " + Config.Title;
            Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
            if (upload != null)
            {
                DeleteViewModel model = new DeleteViewModel();
                model.File = file;
                if (!string.IsNullOrEmpty(upload.DeleteKey) && upload.DeleteKey == key)
                {
                    string filePath = upload.FileName;
                    // Delete from the DB
                    db.Uploads.Remove(upload);
                    db.SaveChanges();

                    // Delete the File
                    if (System.IO.File.Exists(filePath))
                    {
                        System.IO.File.Delete(filePath);
                    }
                    model.Deleted = true;
                }
                else
                {
                    model.Deleted = false;
                }
                return View(model);
            }
            return RedirectToRoute("Error.Http404");
        }

        [HttpPost]
        [AllowAnonymous]
        public ActionResult GenerateDeleteKey(string file)
        {
            Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
            if (upload != null)
            {
                string delKey = Utility.RandomString(Config.UploadConfig.DeleteKeyLength);
                upload.DeleteKey = delKey;
                db.Entry(upload).State = EntityState.Modified;
                db.SaveChanges();
                return Json(new { result = Url.SubRouteUrl("upload", "Upload.Delete", new { file = file, key = delKey }) });
            }
            return Json(new { error = "Invalid URL" });
        }

        [HttpPost]
        [AllowAnonymous]
        public ActionResult SaveFileKey(string file, string key)
        {
            Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
            if (upload != null)
            {
                upload.Key = key;
                db.Entry(upload).State = EntityState.Modified;
                db.SaveChanges();
                return Json(new { result = Url.SubRouteUrl("upload", "Upload.Download", new { file = file }) });
            }
            return Json(new { error = "Invalid URL" });
        }

        [HttpPost]
        [AllowAnonymous]
        public ActionResult RemoveFileKey(string file, string key)
        {
            Models.Upload upload = db.Uploads.Where(up => up.Url == file).FirstOrDefault();
            if (upload != null)
            {
                if (upload.Key == key)
                {
                    upload.Key = null;
                    db.Entry(upload).State = EntityState.Modified;
                    db.SaveChanges();
                    return Json(new { result = Url.SubRouteUrl("upload", "Upload.Download", new { file = file }) });
                }
                return Json(new { error = "Non-Matching Key" });
            }
            return Json(new { error = "Invalid URL" });
        }
    }
}