Imports System.Net.Dns

Public Class Login
    Property userPrincipalName As String = ""
    Property BenutzeranmeldeName As String = ""

    Private Sub Login_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        cSharedClasses.LoggedOnUser.FillWithLoggedOnUser(True)
        Class1.CheckDebug()
        Try
            userPrincipalName = System.DirectoryServices.AccountManagement.UserPrincipal.Current.UserPrincipalName
        Catch
        End Try

        BenutzeranmeldeName = Environment.UserDomainName & "\" & Environment.UserName
        '  MsgBox(userPrincipalName & vbCrLf & BenutzeranmeldeName)
    End Sub

    Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        lblInfo.Text = ""
        Login()
        ' Timer1.Enabled = False
    End Sub

    Public Sub Login()
        Timer1.Enabled = False
        Try
            Abfrage(userPrincipalName)
        Catch
            MsgBox("Fehler beim Anmelden!")
            PasswortabfrageLogin.Show()
        End Try
    End Sub

    Public Function Abfrage(user As String, Optional ByVal txt As Boolean = False)
        Dim locGroups As List(Of String) = GetUserGroupMembership(user)
        Dim gefunden As Boolean = False

        For Each group As String In locGroups
            If group = "CN=SG_Doku_User_FULL" Then
                Class1.LoggedOnUser.FillWithLoggedOnUser(True)
                Class1.LoggedOnUserRights = cBerechtigungen.ReadAll(Class1.LoggedOnUser.BenutzeranmeldeName)
                gefunden = True
                'Main.Show()
                Class1.GroupUsers = uscntr_Benutzer.LoadAllGroupmembers()
                showusersinlist()
                ShowMain()
                Me.Hide()
            End If
        Next
        If gefunden = True Then
            Exit Function
        Else
            Me.WindowState = Me.WindowState.Normal
            PanHilfe.Visible = True
            If txt = True Then lblInfo.Text = "Benutzer ist nicht berechtigt!"
        End If

    End Function

    Function showusersinlist()
        Dim stringi As String = ""
        For Each ben As cBenutzer In Class1.GroupUsers
            stringi &= ben.BenutzeranmeldeName & ", " & ben.distinguishedName & vbCrLf
        Next
        MsgBox(stringi)
    End Function

    Public Function ValidateADUser(ByVal Username As String, ByVal Password As String, Optional ByVal Standort As String = "VeragSub") As Boolean
        Dim LDAP As String = ""
        Select Case Standort
            Case "VeragSub"
                LDAP = "LDAP://DC=VERAG,DC=OST,DC=DMN"
            Case "IMEX"
                LDAP = "LDAP://DC=IMEX,DC=LOCAL"
        End Select
        'Find valid user in Active Directory
        Dim Success As Boolean = False
        Dim Entry As New System.DirectoryServices.DirectoryEntry(LDAP, Username, Password, DirectoryServices.AuthenticationTypes.Secure)
        Dim Searcher As New System.DirectoryServices.DirectorySearcher(Entry)

        Searcher.SearchScope = DirectoryServices.SearchScope.OneLevel
        Try
            Dim Results As System.DirectoryServices.SearchResult = Searcher.FindOne
            Success = Not (Results Is Nothing)
        Catch ex As Exception
            Success = False
        End Try
        Return Success
    End Function

    Friend Function GetUserGroupMembership(ByVal locUsername As String) As List(Of String)
        Dim locResult As New List(Of String)
        Try
            Dim locDirectoryEntry As New DirectoryServices.DirectoryEntry("LDAP://DC=VERAG,DC=OST,DC=DMN") ' ActiveDirectory-Pfad anpassen

            Dim locDirectorySearcher As New DirectoryServices.DirectorySearcher(locDirectoryEntry, "sAMAccountName=" & locUsername)
            Dim locSearchResult As DirectoryServices.SearchResult = locDirectorySearcher.FindOne
            If locSearchResult IsNot Nothing Then
                Dim locUserEntry As New DirectoryServices.DirectoryEntry(locSearchResult.Path)
                Dim locGroups As Object = locUserEntry.Invoke("Groups")
                For Each locGroupObj As Object In DirectCast(locGroups, IEnumerable)
                    Dim locGroupEntry As New DirectoryServices.DirectoryEntry(locGroupObj)
                    locResult.Add(locGroupEntry.Name)
                Next
            Else
                Debug.WriteLine("User nicht gefunden!")
            End If

            Dim locDirectorySearcher2 As New DirectoryServices.DirectorySearcher(locDirectoryEntry, "userPrincipalName=" & locUsername)
            Dim locSearchResult2 As DirectoryServices.SearchResult = locDirectorySearcher2.FindOne
            If locSearchResult2 IsNot Nothing Then
                Dim locUserEntry As New DirectoryServices.DirectoryEntry(locSearchResult2.Path)
                Dim locGroups As Object = locUserEntry.Invoke("Groups")
                For Each locGroupObj As Object In DirectCast(locGroups, IEnumerable)
                    Dim locGroupEntry As New DirectoryServices.DirectoryEntry(locGroupObj)
                    locResult.Add(locGroupEntry.Name)
                Next
            Else
                Debug.WriteLine("User nicht gefunden!")
            End If


        Catch ex As Exception
            MessageBox.Show(ex.Message, "GetUserGroupMembership", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try
        Return locResult
    End Function



    Private Sub btnLogin_Click(sender As Object, e As EventArgs) Handles btnLogin.Click
        If ValidateADUser(txtUser.Text, txtPassword.Text) Then
            Abfrage(txtUser.Text, True)
        Else
            lblInfo.Text = "Benutzername / Passwort falsch"
        End If
    End Sub

    Private Sub txtPassword_KeyDown(sender As Object, e As KeyEventArgs) Handles txtPassword.KeyDown
        If e.KeyCode = Keys.KeyCode.Enter Then
            btnLogin.PerformClick()
        End If
    End Sub

    Function getLDAPPAth(ByVal DomainName As String) As String
        Select Case DomainName
            Case "VERAGOST"
            Case "VERAG-NCTS"
            Case ""
        End Select
    End Function

    Function ShowMain()
        Dim main As New Main

        For Each right As cBerechtigungen In Class1.LoggedOnUserRights
            If right.Standort = "DokuAdmin" And right.Zugriff = "Y" Then
                main.BenutzerToolStripMenuItem.Enabled = True : Exit For
            Else
                main.BenutzerToolStripMenuItem.Enabled = False
            End If
        Next

        main.Show()


    End Function


End Class

'userPrincipalName