Test-IsAdmin.ps1

Function Test-IsAdmin   
{  
<#     
.SYNOPSIS     
   Function used to detect if current user is an Administrator.  
     
.DESCRIPTION   
   Function used to detect if current user is an Administrator. Presents a menu if not an Administrator  
      
.NOTES     
    Name: Test-IsAdmin  
    Author: Boe Prox   
    DateCreated: 30April2011    
      
.EXAMPLE     
    Test-IsAdmin  
      
   
Description   
-----------       
Command will check the current user to see if an Administrator. If not, a menu is presented to the user to either  
continue as the current user context or enter alternate credentials to use. If alternate credentials are used, then  
the [System.Management.Automation.PSCredential] object is returned by the function.  
#>  
    [cmdletbinding()]  
    Param()  
      
    Write-Verbose "Checking to see if current user context is Administrator"  
    If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator"))  
    {  
        Write-Warning "You are not currently running this under an Administrator account! `nThere is potential that this command could fail if not running under an Administrator account."  
        Write-Verbose "Presenting option for user to pick whether to continue as current user or use alternate credentials"  
        #Determine Values for Choice  
        $choice = [System.Management.Automation.Host.ChoiceDescription[]] @("Use &Alternate Credentials","&Continue with current Credentials")  
  
        #Determine Default Selection  
        [int]$default = 0  
  
        #Present choice option to user  
        $userchoice = $host.ui.PromptforChoice("Warning","Please select to use Alternate Credentials or current credentials to run command",$choice,$default)  
  
        Write-Debug "Selection: $userchoice"  
  
        #Determine action to take  
        Switch ($Userchoice)  
        {  
            0  
            {  
                #Prompt for alternate credentials  
                Write-Verbose "Prompting for Alternate Credentials"  
                $Credential = Get-Credential  
                Write-Output $Credential      
            }  
            1  
            {  
                #Continue using current credentials  
                Write-Verbose "Using current credentials"  
                Write-Output "CurrentUser"  
            }  
        }          
          
    }  
    Else   
    {  
        Write-Verbose "Passed Administrator check"  
    }  
}