functions/Get-DbaRoleMember.ps1

Function Get-DbaRoleMember
{
<#
.SYNOPSIS
Get members of all roles on a Sql instance.
 
.DESCRIPTION
Get members of all roles on a Sql instance.
 
Default output includes columns SQLServer, Database, Role, Member.
 
.PARAMETER SQLInstance
The SQL Server that you're connecting to.
 
.PARAMETER SqlCredential
Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted. To use:
 
$scred = Get-Credential, then pass $scred object to the -SqlCredential parameter.
 
SQL Server does not accept Windows credentials being passed as credentials. To connect as a different Windows user, run PowerShell as that user.
 
.PARAMETER IncludeServerLevel
Shows also information on Server Level Permissions.
 
.PARAMETER NoFixedRole
Excludes all members of fixed roles.
 
.PARAMETER Credential
Credential object used to connect to the SQL Server as a different user.
 
.NOTES
Author: Klaas Vandenberghe ( @PowerDBAKlaas )
 
dbatools PowerShell module (https://dbatools.io)
Copyright (C) 2016 Chrissy LeMaire
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.
 
.LINK
 https://dbatools.io/Get-DbaRoleMember
 
.EXAMPLE
Get-DbaRoleMember -SqlServer ServerA
 
Returns a custom object displaying SQLServer, Database, Role, Member for all DatabaseRoles.
 
.EXAMPLE
Get-DbaRoleMember -SqlServer sql2016 | Out-Gridview
 
Returns a gridview displaying SQLServer, Database, Role, Member for all DatabaseRoles.
 
.EXAMPLE
Get-DbaRoleMember -SqlServer ServerA\sql987 -IncludeServerLevel
 
Returns a gridview displaying SQLServer, Database, Role, Member for both ServerRoles and DatabaseRoles.
 
#>

    [CmdletBinding()]
    Param (
        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [Alias("SqlServer", "Server", "Instance")]
        [string[]]$SqlInstance,
        [PsCredential]$SqlCredential,
        [switch]$IncludeServerLevel,
        [switch]$NoFixedRole
    )
    
    DynamicParam
    {
        if ($SqlInstance)
        {
            Get-ParamSqlDatabases -SqlServer $SqlInstance[0] -SqlCredential $Credential
        }
    }
    
    BEGIN
    {
        $databases = $psboundparameters.Databases
    }
    
    PROCESS
    {
        foreach ($instance in $sqlinstance)
        {
            $server = $null
            $server = Connect-SqlServer -SqlServer $instance -SqlCredential $sqlCredential
            if ($Server.count -eq 1)
            {
                if ($IncludeServerLevel)
                {
                    Write-Verbose "Server Role Members included"
                    $instroles = $null
                    Write-Verbose "Getting Server Roles on $instance"
                    $instroles = $server.roles
                    if ($NoFixedRole)
                    {
                        $instroles = $instroles | Where-Object { $_.isfixedrole -eq $false }
                    }
                    ForEach ($instrole in $instroles)
                    {
                        Write-Verbose "Getting Server Role Members for $instrole on $instance"
                        $irmembers = $null
                        $irmembers = $instrole.enumserverrolemembers()
                        ForEach ($irmem in $irmembers)
                        {
                            [PSCustomObject]@{
                                SQLInstance = $instance
                                Database = $null
                                Role = $instrole.name
                                Member = $irmem.tostring()
                            }
                        }
                    }
                }
                
                $dbs = $server.Databases
                
                if ($databases.count -gt 0)
                {
                    $dbs = $dbs | Where-Object { $databases -contains $_.Name  }
                }
                
                foreach ($db in $dbs)
                {
                    $dbroles = $db.roles
                    Write-Verbose "Getting Database Roles for $($db.name) on $instance"
                    
                    if ($NoFixedRole)
                    {
                        $dbroles = $dbroles | Where-Object { $_.isfixedrole -eq $false }
                    }
                    
                    foreach ($dbrole in $dbroles)
                    {
                        Write-Verbose "Getting Database Role Members for $dbrole in $($db.name) on $instance"
                        $dbmembers = $dbrole.enummembers()
                        ForEach ($dbmem in $dbmembers)
                        {
                            [PSCustomObject]@{
                                SqlInstance = $instance
                                Database = $db.name
                                Role = $dbrole.name
                                Member = $dbmem.tostring()
                            }
                        }
                    }
                }
            }
            else
            {
                Write-Warning "Can't connect to $instance. Moving on."
                Continue
            }
        }
    }
}