.net qr code generator Type-Level Authorization in Visual Basic .NET

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Type-Level Authorization
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A business developer can specify what roles are allowed to create, get, update, and delete each business object type. This behavior is not at the object instance level but is at the type level. In other words, these roles are defined and can be accessed without ever creating an instance of a business object. The intent of this functionality is to allow a UI developer to determine whether the user could create, retrieve, update, or delete an object. Ideally, the UI developer would do these checks before ever creating an instance of a business object, so the various buttons, menu items, and links the user would use to perform each action can be disabled if they don t work anyway. The AuthorizationRules class uses the ObjectAuthorizationRules type to manage this behavior.
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CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
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Inside a business class, a developer can write code like this to define these roles: Private Shared Sub AddObjectAuthorizationRules() Csla.Security.AuthorizationRules.AllowGet("Supervisor") End Sub This indicates that the users in the Supervisor role should be allowed to retrieve instances of this business object type. Notice that the AddObjectAuthorizationRules() method is Shared, so it can be invoked without needing to first create an instance of the business object. Table 12-3 lists the Shared methods from the AuthorizationRules class available to the business object developer.
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Table 12-3. Per-Type Authentication Methods
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AllowCreate() AllowGet() AllowEdit() AllowDelete()
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Specifies the roles allowed to create a new object Specifies the roles allowed to get an existing object Specifies the roles allowed to edit and save (insert or update) an object Specifies the roles allowed to delete an object
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The AddObjectAuthorizationRules() method is invoked by ObjectAuthorizationRules the first time an attempt is made to get the list of roles for a business object type. Because all these values are maintained in a Shared cache, multithreading issues must be managed, just as I discussed in 11 in regard to validation. Here is the GetRoles() method and the declaration of the Shared cache it uses: Private Shared _managers As New Dictionary(Of Type, RolesForType)() Friend Shared Function GetRoles(ByVal objectType As Type) As RolesForType Dim result As RolesForType = Nothing If Not _managers.TryGetValue(objectType, result) Then SyncLock _managers If Not _managers.TryGetValue(objectType, result) Then result = New RolesForType() _managers.Add(objectType, result) ' invoke method to add auth roles Dim flags = BindingFlags.Static Or _ BindingFlags.Public Or _ BindingFlags.NonPublic Or _ BindingFlags.FlattenHierarchy Dim method = objectType.GetMethod("AddObjectAuthorizationRules", flags) If method IsNot Nothing Then method.Invoke(Nothing, Nothing) End If End If End SyncLock End If Return result End Function
CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
The same kind of SyncLock scheme I discuss in 11 is used here. The result is that the first thread to attempt to access this property and get through the SyncLock statement will use reflection to invoke the AddObjectAuthorizationRules() method on the business class. This happens only once per AppDomain, and the roles are cached for use throughout the remainder of the application s lifetime. The methods called by the business developer are defined in the AuthorizationRules class. For example, here s the AllowGet() method: Public Shared Sub AllowGet(ByVal objectType As Type, _ ByVal ParamArray roles As String()) Dim typeRules = ObjectAuthorizationRules.GetRoles(objectType) typeRules.AllowGet(roles) End Sub There s no locking here because this method is intended for use only within the AddObjectBusinessRules() method, and that method is invoked only within the context of a SyncLock statement, so it is already thread-safe.
Using Type-Level Roles
Now that you understand how the type-level roles are added and cached, it is important to understand how they are used. Any code in the business or UI layer can determine whether the current user is authorized to create, get, update, or delete a type of business object with code such as this: Dim canGet As Boolean = Csla.Security.AuthorizationRules.CanGetObject( _ GetType(MyObject)) There are CanCreateObject(), CanEditObject(), and CanDeleteObject() methods as well, and they work the same way. For example, here s the CanGetObject() method: Public Shared Function CanGetObject(ByVal objectType As Type) As Boolean Dim result As Boolean = True Dim principal = ApplicationContext.User Dim allow = Csla.Security.AuthorizationRules.GetAllowGetRoles(objectType) If allow IsNot Nothing Then If Not Csla.Security.AuthorizationRulesManager.PrincipalRoleInList( _ principal, allow) Then result = False End If Else Dim deny = Csla.Security.AuthorizationRules.GetDenyGetRoles(objectType) If deny IsNot Nothing Then If Csla.Security.AuthorizationRulesManager.PrincipalRoleInList( _ principal, deny) Then result = False End If End If End If Return result End Function The GetAllowGetRoles() and GetDenyGetRoles() methods are helper methods that retrieve the list of roles allowed and denied access to the get operation for the specified type: Friend Shared Function GetAllowGetRoles( _ ByVal objectType As Type) As List(Of String) Dim typeRules = ObjectAuthorizationRules.GetRoles(objectType) Return typeRules.AllowGetRoles End Function
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