动态添加角色以授权控制器的属性

Question

我需要让我的管理员用户即时更改用户的访问权限，以便他们可以创建新角色并向这些角色添加权限。

我希望能够创建一个Authorize 属性以粘贴在我可以从数据库中添加角色的控制器类之上，这样我就不必在开发过程中“设置”角色，如@ 987654323@等

比如[Authorize(Roles = GetListOfRoles()]

我发现了这个问题 - ASP.NET MVC Authorize user with many roles，它做了类似的事情，但也许有办法改变它，以便从数据库中获取权限/角色列表？

Answer 1

这样的事情怎么样：

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class MyCustomAuthorizationAttribute : AuthorizeAttribute
{
    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        // Do some logic here to pull authorised roles from backing store (AppSettings, MSSQL, MySQL, MongoDB etc)
        ...
        // Check that the user belongs to one or more of these roles 
        bool isUserAuthorized = ....;

        if(isUserAuthorized) 
            return true;

        return base.AuthorizeCore(httpContext);
    }
}

您可以将它与数据库一起使用，或者只是在 web.config 中维护授权角色列表。

Answer 2

这就是我如何提取一个属性，该属性可以根据用户角色的权限为每个方法授权用户。我希望这对其他人有帮助：

/// <summary>
/// Custom authorization attribute for setting per-method accessibility 
/// </summary>
[AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class SetPermissionsAttribute : AuthorizeAttribute
{
    /// <summary>
    /// The name of each action that must be permissible for this method, separated by a comma.
    /// </summary>
    public string Permissions { get; set; }

    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        SalesDBContext db = new SalesDBContext();
        UserManager<ApplicationUser> userManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
        ApplicationDbContext dbu = new ApplicationDbContext();

        bool isUserAuthorized = base.AuthorizeCore(httpContext);

        string[] permissions = Permissions.Split(',').ToArray();

        IEnumerable<string> perms = permissions.Intersect(db.Permissions.Select(p => p.ActionName));
        List<IdentityRole> roles = new List<IdentityRole>();

        if (perms.Count() > 0)
        {
            foreach (var item in perms)
            {
                var currentUserId = httpContext.User.Identity.GetUserId();
                var relatedPermisssionRole = dbu.Roles.Find(db.Permissions.Single(p => p.ActionName == item).RoleId).Name;
                if (userManager.IsInRole(currentUserId, relatedPermisssionRole))
                {
                    return true;
                }
            }
        }
        return false;
    }
}