functions/Test-DbaDatabaseOwner.ps1

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function Test-DbaDatabaseOwner {
    <#
  .SYNOPSIS
   Checks database owners against a login to validate which databases do not match that owner.
 
  .DESCRIPTION
   This function will check all databases on an instance against a SQL login to validate if that
   login owns those databases or not. By default, the function will check against 'sa' for
   ownership, but the user can pass a specific login if they use something else. Only databases
   that do not match this ownership will be displayed, but if the -Detailed switch is set all
   databases will be shown.
 
   Best Practice reference: http://weblogs.sqlteam.com/dang/archive/2008/01/13/Database-Owner-Troubles.aspx
 
  .NOTES
   Tags:
   Author: Michael Fal (@Mike_Fal), http://mikefal.net
   Website: https://dbatools.io
   Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
   License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
  .PARAMETER SqlInstance
   Specifies the SQL Server instance(s) to scan.
    
  .PARAMETER SqlCredential
   Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use:
 
   $scred = Get-Credential, then pass $scred object to the -SqlCredential parameter.
 
   Windows Authentication will be used if SqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
 
   To connect as a different Windows user, run PowerShell as that user.
 
  .PARAMETER Database
   Specifies the database(s) to process. Options for this list are auto-populated from the server. If unspecified, all databases will be processed.
   
  .PARAMETER ExcludeDatabase
   Specifies the database(s) to exclude from processing. Options for this list are auto-populated from the server.
   
  .PARAMETER TargetLogin
   Specifies the login that you wish check for ownership. This defaults to 'sa' or the sysadmin name if sa was renamed. This must be a valid security principal which exists on the target server.
 
  .PARAMETER Detailed
   If this switch is enabled, a list of all databases and whether or not their owner matches TargetLogin is returned.
 
  .LINK
   https://dbatools.io/Test-DbaDatabaseOwner
 
  .EXAMPLE
   Test-DbaDatabaseOwner -SqlInstance localhost
 
   Returns all databases where the owner does not match 'sa'.
 
  .EXAMPLE
   Test-DbaDatabaseOwner -SqlInstance localhost -TargetLogin 'DOMAIN\account'
 
   Returns all databases where the owner does not match 'DOMAIN\account'.
 #>

    [OutputType("System.Object[]")]
    [CmdletBinding()]
    param (
        [parameter(Mandatory = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [Alias("Databases")]
        [object[]]$Database,
        [object[]]$ExcludeDatabase,
        [string]$TargetLogin,
        [Switch]$Detailed
    )

    begin {
        #connect to the instance and set return array empty
        $return = @()
    }

    process {
        foreach ($servername in $SqlInstance) {
            Write-Verbose "Connecting to $servername"
            $server = Connect-SqlInstance $servername -SqlCredential $SqlCredential

            # dynamic sa name for orgs who have changed their sa name
            if ($TargetLogin.length -eq 0) {
                $TargetLogin = ($server.logins | Where-Object { $_.id -eq 1 }).Name
            }
            
            #Validate login
            if (($server.Logins.Name) -notcontains $TargetLogin) {
                if ($SqlInstance.count -eq 1) {
                    throw "Invalid login: $TargetLogin"
                    return $null
                }
                else {
                    Write-Warning "$TargetLogin is not a valid login on $servername. Moving on."
                    Continue
                }
            }
            #use online/available dbs
            $dbs = $server.Databases

            #filter database collection based on parameters
            if ($Database) {
                $dbs = $dbs | Where-Object { $Database -contains $_.Name }
            }

            if ($ExcludeDatabase) {
                $dbs = $dbs | Where-Object Name -NotIn $ExcludeDatabase
            }

            #for each database, create custom object for return set.
            foreach ($db in $dbs) {
                Write-Verbose "Checking $db"
                $row = [ordered]@{
                    Server       = $server.Name
                    Database     = $db.Name
                    DBState      = $db.Status
                    CurrentOwner = $db.Owner
                    TargetOwner  = $TargetLogin
                    OwnerMatch   = ($db.owner -eq $TargetLogin)
                }

                #add each custom object to the return array
                $return += New-Object PSObject -Property $row
            }
        }
    }

    end {
        #return results
        if ($Detailed) {
            Write-Verbose "Returning detailed results."
            return $return
        }
        else {
            Write-Verbose "Returning default results."
            return ($return | Where-Object { $_.OwnerMatch -eq $false })
        }
    }
}