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European ASP.NET 4.5 Hosting - UK :: Zip File Manipulation in ASP.NET 4.5

clock December 11, 2014 08:16 by author Scott

One of the missing feature of .NET framework was a support for Zip file manipulation such as reading the zip archive, adding files, extracting files, etc. and we were using some third party libraries such as excellent the DotNetZip. In .NET 4.5, we have an extensive support for manipulating .zip files.

First thing that you should do is to add System.IO.Compression assembly as reference to your project. You may also want to reference System.IO.Compression.FileSystem assembly to access three extension methods (from the ZipFileExtensions class) for the ZipArchive class: CreateEntryFromFile,CreateEntryFromFile, and ExtractToDirectory. These extension methods enable you to compress and decompress the contents of the entry to a file.

Let’s cover the bits and pieces that we get from System.IO.Compression assembly at first. The below sample shows how to read a zip archive easily with ZipArchive class:

static void Main(string[] args) {

    const string zipFilePath = @"C:\apps\Sample Pictures.zip";

    using (FileStream zipFileToOpen = new FileStream(zipFilePath, FileMode.Open))
    using (ZipArchive archive = new ZipArchive(zipFileToOpen, ZipArchiveMode.Read)) {

        foreach (var zipArchiveEntry in archive.Entries)
            Console.WriteLine(
                "FullName of the Zip Archive Entry: {0}", zipArchiveEntry.FullName
            );
    }
}

In this sample, we are opening the zip archive and iterate through the collection of entries. When we run the application, we should see the list of files inside the zip archive:

It’s also so easy to add a new file to the zip archive:

static void Main(string[] args) {

    const string zipFilePath = @"C:\apps\Sample Pictures.zip";

    using (FileStream zipFileToOpen = new FileStream(zipFilePath, FileMode.Open))
    using (ZipArchive archive = new ZipArchive(zipFileToOpen, ZipArchiveMode.Update)) {

        ZipArchiveEntry readMeEntry = archive.CreateEntry("ReadMe.txt");
        using (StreamWriter writer = new StreamWriter(readMeEntry.Open())) {
            writer.WriteLine("Lorem ipsum dolor sit amet...");
            writer.Write("Proin rutrum, massa sed molestie porta, urna...");
        }

        foreach (var zipArchiveEntry in archive.Entries)
            Console.WriteLine(
                "FullName of the Zip Archive Entry: {0}", zipArchiveEntry.FullName
            );
    }
}

In this sample, we are adding a file named ReadMe.txt at the root of archive and then we are writing some text into that file.

Extracting files is into a folder is so easy as well. You need reference the System.IO.Compression.FileSystem assembly along with System.IO.Compression assembly as mentioned before for this sample:

static void Main(string[] args) {

    const string zipFilePath = @"C:\apps\Sample Pictures.zip";
    const string dirToExtract = @"C:\apps\Sample Pictures\";

    using (FileStream zipFileToOpen = new FileStream(zipFilePath, FileMode.Open))
    using (ZipArchive archive = new ZipArchive(zipFileToOpen, ZipArchiveMode.Update))
        archive.ExtractToDirectory(dirToExtract);
}

There are some other handy APIs as well but it is so easy to discover them by yourself. 



European ASP.NET 4.5 Hosting - UK :: How to Use ListView Control in ASP.NET 4.5

clock July 24, 2014 08:49 by author Scott

ASP.NET 4.5 offer many great feature. Previously, we have discussed about one of new feature on ASP.NET 4.5, Key HTML Editor Features in ASP.NET 4.5. In today post, we will discuss about how to use ListView Control in ASP.NET 4.5

ASP.NET ListView Control has a great features that GridView and Repeater controls had control over the markup. The ListView Control allows you to display the data in various formats including grid format, bulleted list format and in flow format.

How to Insert and Delete Data with the ListView Control

OK, let’s get started

1. Drag the ListView control from data category of the toolbox to default.aspx page and choose the datasource for the control as shown below

2. Configure ListView option from ListViewControl smart tags as shown below

Provide the template information by selecting the desired template and also it allows you to select style for control. It also allows you to enable operations such as inserting and updating.

3. Add some custom styling to the control by adding a class as shown below

<LayoutTemplate>
            <ul id="itemPlaceholderContainer" runat="server" class="ItemStyle">
                <li runat="server" id="itemPlaceholder" />
            </ul>
</LayoutTemplate>

4. Remove the Id columns from ItemTemplate as these mark-ups generated automatically when you configure the control and columns. Repeat the same for InsertItemTemplate.

5. Add the custom styles to item containers as below

.ItemStyle
{
  width: 800px;
  list-style-type:none;
  clear:both;
}

.ItemStyle li
{
  height: 300px;
 width:250px;
 float:left;
}
.ItemStyle li img
{
 width:180px;
margin: 10px 20px 10px 0;
}

6. Run your application and you’ll see the result

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European ASP.NET 4.5 Cloud Hosting - Germany :: Claims-Based Security in ASP.NET 4.5

clock June 5, 2014 10:42 by author Scott

When you talk about authentication in ASP.NET you will most undoubtedly hear the mention of the MembershipProvider. I'm here to tell you not to go down that road. That road will only lead to tears and suffering. This post will help you understand and implement your ASP.NET authentication built on top of FormsAuthentication. I hope you take away that building this stuff is not hard as long as you don't try to over think it.

Before I show you how to implement a kick-butt authentication system, I'll show you the simplest solution you could build.

FormsAuthentication.SetAuthCookie(user.Id, createPersistentCookie: true);

Congratulations you are now officially signed into your ASP.NET application using forms authentication. Notice I don't have any SQL migrations, crazy classes, or any other crap you didn't ask for.

 

The code above writes a cookie to the response of the current HttpContext. On the user's next request that cookie will be passed back to the server and used to check whether they are authenticated or not.

Password Hasher

Hashing passwords is really easy with .NET. The trick is to generate a salt with every password. The idea of the salt is not to be a secret, but to be unique every time. This makes it difficult for hackers to process all your passwords in the case your system is compromised. This is my standard password hasher:

public static class PasswordHasher {
    private const int SaltSize = 64;

    public static Passphrase Hash(string password) {
        if (password == null) throw new ArgumentNullException("password");

        byte[] passwordBytes = Encoding.Unicode.GetBytes(password);
        byte[] saltBytes = CreateRandomSalt();
        string hashedPassword = ComputeHash(passwordBytes, saltBytes);

        return new Passphrase {
            Hash = hashedPassword,
            // Convert salt from byte[] to string
            Salt = Convert.ToBase64String(saltBytes)
        };
    }

    public static bool Equals(string password, string salt, string hash) {
        return String.CompareOrdinal(hash, Hash(password, salt)) == 0;
    }

    public static string GenerateRandomSalt(int size = SaltSize) {
        return Convert.ToBase64String(CreateRandomSalt(size));
    }

    private static string ComputeHash(byte[] password, byte[] salt) {
        var passwordAndSalt = new byte[salt.Length + password.Length];

        Buffer.BlockCopy(salt, 0, passwordAndSalt, 0, salt.Length);
        Buffer.BlockCopy(password, 0, passwordAndSalt, salt.Length, password.Length);
        byte[] computedHash;
        using (HashAlgorithm algorithm = new SHA256Managed()) {
            computedHash = algorithm.ComputeHash(passwordAndSalt);
        }
        return Convert.ToBase64String(computedHash);
    }

    private static string Hash(string password, string salt) {
        return ComputeHash(Encoding.Unicode.GetBytes(password), Convert.FromBase64String(salt));
    }

    private static byte[] CreateRandomSalt(int size = SaltSize) {
        if (size <= 0)
            throw new ArgumentException("size must be greater than zero.");

        var saltBytes = new Byte[size];
        using (var rng = new RNGCryptoServiceProvider()) {
            rng.GetBytes(saltBytes);
        }
        return saltBytes;
    }
}

public class Passphrase {
    public string Hash { get; set; }
    public string Salt { get; set; }
}

Principal and Identity

The IPrincipal and IIdentity interfaces are crucial to authentication in .NET. If you have ever used HttpContext, WebForms, or ASP.NET MVC then you are using derivations of these interfaces. It usually comes in the guise of a User property. You don't have to implement these classes, you can always use the GenericPrincipal and GenericIdentity. I like to implement them myself, because it allows me to pass a bit more useful data around in the cookie (remember cookies have size limits).

Let's first look at the IPrinicipal implementation:

public class MuchoPrincipal : IPrincipal {
    private readonly MuchoIdentity _identity;

    public MuchoPrincipal(MuchoIdentity identity) {
        _identity = identity;
    }

    #region IPrincipal Members

    public bool IsInRole(string role) {
        return
            _identity.Roles.Any(
                current => string.Compare(current, role, StringComparison.InvariantCultureIgnoreCase) == 0);
    }

    public IIdentity Identity {
        get { return _identity; }
    }

    public MuchoIdentity Information {
        get { return _identity; }
    }

    public bool IsUser {
        get { return !IsGuest; }
    }

    public bool IsGuest {
        get { return IsInRole("guest"); }
    }

    #endregion
}

Next up is the IIdentity, just take a look:

public class MuchoIdentity : IIdentity {
    public MuchoIdentity(FormsAuthenticationTicket ticket) {
        if (ticket == null) {
            Name = "Guest";
            Roles = new List<string> { "guest" };
            return;
        }

        var data = JsonConvert.DeserializeObject<MuchoCookie>(ticket.UserData);

        if (data == null) {
            AsGuest();
            return;
        }

        Id = data.Id;
        FirstName = data.FirstName;
        LastName = data.LastName;
        Name = string.IsNullOrWhiteSpace(FirstName) || string.IsNullOrWhiteSpace(LastName)
                   ? data.Email
                   : "{0} {1}".With(FirstName, LastName);
        Email = data.Email;
        Roles = data.Roles ?? new List<string> { "user" };
        RememberMe = data.RememberMe;

        try {
            TimeZone = TimeZoneInfo.FindSystemTimeZoneById(data.TimeZone);
        } catch (Exception) {
            TimeZone = TimeZoneInfo.Utc;
        }
    }

    public MuchoIdentity(User user) {
        if (user == null) {
            AsGuest();
            return;
        }

        Id = user.Id;
        Email = user.Email;
        FirstName = user.FirstName;
        LastName = user.LastName;
        Name = string.IsNullOrWhiteSpace(FirstName) || string.IsNullOrWhiteSpace(LastName)
                   ? user.Email
                   : "{0} {1}".With(FirstName, LastName);

        try {
            TimeZone = TimeZoneInfo.FindSystemTimeZoneById(user.TimeZone);
        } catch (Exception) {
            TimeZone = TimeZoneInfo.Utc;
        }
        Roles = new List<string> { user.Role ?? "user" };
    }

    private void AsGuest() {
        Name = "Guest";
        Roles = new List<string> { "guest" };
    }

    public int Id { get; set; }
    public string Email { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public TimeZoneInfo TimeZone { get; set; }
    public bool RememberMe { get; set; }
    public IList<string> Roles { get; set; }

    #region IIdentity Members

    public string AuthenticationType {
        get { return "MuchoForms"; }
    }

    public bool IsAuthenticated {
        get { return !( Id == 0 || string.IsNullOrWhiteSpace(Email)); }
    }

    public string Name { get; protected set;

    #endregion
}

C is for Cookie

The cookie object is really just a data transfer object. Nothing really mind blowing here. I usually create a structure to store my useful information. Again, keep in mind the size limitations of a cookie which is about 4kb (4096 bytes).

public class MuchoCookie {
    public MuchoCookie() {
        Roles = new List<string>();
    }

    public int Id { get; set; }
    public string Email { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string TimeZone { get; set; }
    public List<string> Roles { get; set; }
    public bool RememberMe { get; set; }
}

FormsAuthenticationService

FormsAuthentication is built right into ASP.NET, but I like to write a littler wrapper around it so I can test and inject it into other classes. Also I create the cookie from the previous section when a user successfully signs in.

public class FormsAuthenticationService : IFormsAuthenticationService {
    private readonly HttpContextBase _httpContext;

    public FormsAuthenticationService(HttpContextBase httpContext) {
        _httpContext = httpContext;
    }

    #region IFormsAuthenticationService Members

    public void SignIn(User user, bool createPersistentCookie) {
        if (user == null)
            throw new ArgumentNullException("user");

        var cookie = new MuchoCookie {
            Id = user.Id,
            Email = user.Email,
            FirstName = user.FirstName,
            LastName = user.LastName,
            RememberMe = createPersistentCookie,
            TimeZone = user.TimeZone,
            Roles = new List<string> { user.Role ?? "user" }
        };

        string userData = JsonConvert.SerializeObject(cookie);
        var ticket = new FormsAuthenticationTicket(1, cookie.Email, DateTime.Now,
                                                   DateTime.Now.Add(FormsAuthentication.Timeout),
                                                   createPersistentCookie, userData);
        string encTicket = FormsAuthentication.Encrypt(ticket);
        var httpCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket) { Expires = DateTime.Now.Add(FormsAuthentication.Timeout) };

        _httpContext.Response.Cookies.Add(httpCookie);
    }

    public void SignOut() {
        // Not worth covering, has been tested by Microsoft
        FormsAuthentication.SignOut();
    }

    #endregion
}

Notice the SignIn method creates the cookie and just writes it to the response using FormsAuthentication. We are leveraging what ASP.NET gives us. There is no reason to reinvent the wheel when it comes to passing secure cookies to the client.

PrincipalService

The principal service helps us get the information out of a cookie and rehydrate our IPrinipal and our IIdentity to our custom implementations. The other added benefit is we can actually set the User property to a Guest principal with extra information if we need it.

public class MuchoSupportPrincipalService : IPrincipalService {
    private readonly HttpContextBase _context;

    public MuchoSupportPrincipalService(HttpContextBase context) {
        _context = context;
    }

    #region IPrincipalService Members

    public IPrincipal GetCurrent() {
        IPrincipal user = _context.User;
        // if they are already signed in, and conversion has happened
        if (user != null && user is MuchoPrincipal)
            return user;

        // if they are signed in, but conversion has still not happened
        if (user != null && user.Identity.IsAuthenticated && user.Identity is FormsIdentity) {
            var id = (FormsIdentity)_context.User.Identity;

            var ticket = id.Ticket;
            if (FormsAuthentication.SlidingExpiration) 
                ticket = FormsAuthentication.RenewTicketIfOld(ticket);

            var fid = new MuchoIdentity(ticket);
            return new MuchoPrincipal(fid);
        }

        // not sure what's happening, let's just default here to a Guest
        return new MuchoPrincipal(new MuchoIdentity((FormsAuthenticationTicket)null));
    }

    #endregion
}

The trick here is just to check the current context for the cookie already being passed in with our request. You need to call this code from your Global.asax as such (note I am using ASP.NET MVC and the dependency resolver built into it).

protected void Application_AuthenticateRequest(object sender, EventArgs e) {
    var principalService = DependencyResolver.Current.GetService<IPrincipalService>();
    var context = DependencyResolver.Current.GetService<HttpContextBase>();
    // Set the HttpContext's User to our IPrincipal
    context.User = principalService.GetCurrent();
}

Usage in Your Code

This is what my ASP.NET MVC controller looks like:

[RequireScheme(Scheme.Https)]
public class AuthenticationController : ApplicationController {
public ActionResult Login(string returnUrl) {

if (User.Identity.IsAuthenticated) {
if (!string.IsNullOrWhiteSpace(returnUrl))
return Redirect(returnUrl);

return RedirectToAction("show", "dashboard");
}

var model = new LoginModel {
ReturnUrl = returnUrl
};

return View(model);
}

[HttpPost]
public ActionResult Login(LoginModel input) {
// validation does password hash check
// you could do it more explicitly
if (ModelState.IsValid) {
Logger.Info("successful!", input.Username);
var user = Db.Users
.FirstOrDefault(u => u.Email == input.Username);
// set cookie
Forms.SignIn(user, input.RememberMe);
return input.HasReturnUrl(Url)
? Redirect(input.ReturnUrl)
: (ActionResult) RedirectToAction("show", "dashboard");
}

Flash.Error("Please try again");

return View("login", input);
}

public ActionResult Logout() {
Forms.SignOut();
return RedirectToAction("login");
}
}

Conclusion

The parts of an authentication system are all infrastructural. It is all smooth sailing once you get over the hump of setting it up. Once the infrastructure is set up you can work on creating your own tables for Users, Profiles, or any other domain model that makes sense. All access to user's is up to you, so feel free to use any data access provider you like: SQL Server, RavenDB, MongoDB, etc. Additionally, the cookie is now yours; feel free to add or remove data from it as you see fit, but always remember the 4kb size limit.



FREE ASP.NET 4.5 Hosting UK - HostForLIFE.eu :: How can HostForLIFE.eu Guarantee Our Windows ASP.NET 4.5 Hosting Service?

clock March 24, 2014 07:05 by author Scott

Only focusing on ASP.NET hosting service, HostForLIFE prove ourselves to be one of the best ASP.NET hosting providers that offer the most highlights, although there are thousands of ASP.NET hosting companies on the market. In below, we have listed our main features that has integrated with our 4 ASP.NET hosting plans.

Offering Many Excellent Features

- 1-Click Application Installer

In the HostForLIFE control panel, there is a 1-click web application installer for convenient installation of many popular open source web applications, including PHP apps like WordPress, Joomla, Drupal and phpBB, and ASP.NET applications like DotNetNuke, nopCommerce, BlogEngine and Orchard.

- PHP & MySQL

In the past, PHP didn't run well on a Windows server, but over the last several years, Microsoft has improved IIS and now PHP runs vey well on Windows hosting platforms, which means famous open source apps like Joomla, WordPress and Drupal can run well on HostForLIFE Windows hosting plans.

In addition, by supporting MySQL as part of their Windows hosting platform, a popular open source relational database system, HostForLIFE enables customers to use a lot of popular open source apps.

- ASP.NET 4.5.1 Hosting

We support ASP.NET 4.5.1 hosting on our Windows 2012 platform, which is compatible with Visual Studio 2013/2012, and our Windows 2008 hosting platform also fully supports ASP.NET 4.0 and is compatible with Visual Studio 2010, which enables customers' applications to be written in any language that is compatible with the common language runtime, including Visual Basic and C#.

- SQL Server

HostForLIFE always improve our technology and we always up to date with the Micorosoft technology. We offer the latest SQL 2012 version. We also support integrated full text search, stored procedures and ASP.NET SQL Session, which makes their customers get DBO right and manage SQL database remotely using SQL Management Studio or SQL Management Studio Express.

- Windows 2012 Hosting

We use Windows server 2012 – the latest Windows operating system comes with IIS8 to deliver customers with more options for their web applications including support for .NET, ASP and PHP. What's more, they support Full Trust to make customers' sites isolated from one another for greater reliability and security.

Utilizing Cutting-Edge Facilities & Infrastructures

HostForLIFE uses a state-of-the-art data enter which is featured with UPS backup power, diesel generators, firewall protection and 24×7 security. Moreover, we houses dual quad Dell servers that are 100% factory built and tested, coming with the best specification of 64 bit software, 32 GB of RAM, and RAID 10 disk arrays. All of the first-class facilities and infrastructures enable HostForLIFE to provide satisfying uptime and fast hosting speed for our customers to run websites smoothly and stably.

Providing Quality Technical Support

As one of the most reliable hosting companies, HostForLIFE offers quality technical support powered by a group of support staffs through email, all of who are professional, knowledgeable, experienced and on-site 24×7, so that we are able to give quick response and effective assistance to troubled customers to resolve problems.

In addition, in our online knowledgebase and blog, HostForLIFE technicians and engineers have worked out a lot of in-depth articles to teach customers how to deal with common issues independently.



About HostForLIFE.eu

HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes.

We have offered the latest Windows 2012 Hosting, ASP.NET 4.5 Hosting, ASP.NET MVC 4 Hosting, ASP.NET MVC 5 Hosting and SQL 2014 Hosting.


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