Handling user roles in Lotus script

Problem description: In lotus notes development it is quite often, we developers face situations, where based on the user's role we have to grant/restrict some of the functions for him/her.

Solution: Solution is quite simple. we can use 'Evaluate' function as follows.

Step1:

Create a function in the script library as below.
%REM
=============================================================
Input: Role name should be passed to this function, without square brackets
Return value: True if the passed role is enabled for current user. Else false.
=============================================================
%END REM

Function CheckUserRole(RoleName As String) As Variant
Dim CheckRole As String
Dim Userroles As Variant
CheckUserRole=False
CheckRole="["+RoleName+"]"
UserRoles= Evaluate("@UserRoles")

If Not Isempty(UserRoles ) Then
If Not Isnull(Arraygetindex(UserRoles,CheckRole,0)) Then
CheckUserRole=True
End If
End If
End Function

Step2:

Now use the above function, wherever it is required as follows.

Sub Querydocumentdelete(Source As Notesuidatabase, Continue As Variant)
'If the user do not have [Admin] role then do not allow him to delete a document

Dim Response As Integer

If Not CheckUserRole("Admin") Then
Msgbox "You are not authorized to delete document from the database", 16, "Warning"
Continue = False
Exit Sub
End If

End Sub