How to Restrict Browser

Question

I build a site in mvc3 , i want to restrict my site on firefox .

i mean to say that when anyone open my site on firefox it open correctly but when anyone opens it on chrome or IE it give an customze error . I am using c# with mvc3

Answer 1

You could write a global action filter which will test the User-Agent HTTP request header:

public class FireFoxOnlyAttribute : ActionFilterAttribute, IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        var userAgent = filterContext.HttpContext.Request.Headers["User-Agent"];
        if (!IsFirefox(userAgent))
        {
            filterContext.Result = new ViewResult
            {
                ViewName = "~/Views/Shared/Unauthorized.cshtml"
            };
        }
    }

    private bool IsFirefox(string userAgent)
    {
        // up to you to implement this method. You could use
        // regular expressions or simple IndexOf method or whatever you like
        throw new NotImplementedException();
    }
}

and then register this filter in Global.asax:

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    filters.Add(new HandleErrorAttribute());
    filters.Add(new FireFoxOnlyAttribute());
}

Answer 2

You are looking for the user-agent of the user connected to your website, which may be retrieved via this call in your controller:

Request.UserAgent

Not that I agree with such a pattern, though.

Answer 3

This is a simple javascript function you may add to your code and perform the actions against.

function detect_browser() {
    var agt=navigator.userAgent.toLowerCase();
    if (agt.indexOf("firefox") != -1) return true;
    else{
        window.location="";//Here within quotes write the location of your error page.
    }
}

On main page you may call the function on page load event. Though this practice is not recommended.

Answer 4

You could test the Request.UserAgent as part of a constraint on the route.

For example, you could define a route constraint routine as follows:

public class UserAgentConstraint : IRouteConstraint
{
    private string requiredUserAgent;

    public UserAgentConstraint(string agentParam)
    {
        requiredUserAgent = agentParam;
    }

    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        return httpContext.Request.UserAgent != null && httpContext.Request.UserAgent.Contains(requiredUserAgent);
    }
}

Then add the following constraint to a route:

routes.MapRoute(
    "Default", // Route name
    "{controller}/{action}/{id}", // URL with parameters
    new { controller = "Home", action = "Index", id = UrlParameter.Optional }, //Parameter defaults
    new { customConstraint = new UserAgentConstraint("Firefox") } //Constraint
);