functions/Test-DbaAgentJobOwner.ps1

function Test-DbaAgentJobOwner {
    <#
    .SYNOPSIS
        Checks SQL Agent Job owners against a login to validate which jobs do not match that owner.
 
    .DESCRIPTION
        This function checks all SQL Agent Jobs on an instance against a SQL login to validate if that login owns those SQL Agent Jobs or not. By default, the function checks against 'sa' for ownership, but the user can pass a specific login if they use something else.
 
        Only SQL Agent Jobs that do not match this ownership will be displayed.
        Best practice reference: http://sqlmag.com/blog/sql-server-tip-assign-ownership-jobs-sysadmin-account
 
    .PARAMETER SqlInstance
        The target SQL Server instance or instances.
 
    .PARAMETER SqlCredential
        Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential)
 
    .PARAMETER Job
        Specifies the job(s) to process. Options for this list are auto-populated from the server. If unspecified, all jobs will be processed.
 
    .PARAMETER ExcludeJob
        Specifies the job(s) to exclude from processing. Options for this list are auto-populated from the server.
 
    .PARAMETER Login
        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
        Output all properties, will be deprecated in 1.0.0 release.
 
    .PARAMETER EnableException
        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
    .NOTES
        Tags: Agent, Job, Owner
        Author: Michael Fal (@Mike_Fal), http://mikefal.net
 
        Website: https://dbatools.io
        Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT
 
    .LINK
        https://dbatools.io/Test-DbaAgentJobOwner
 
    .EXAMPLE
        PS C:\> Test-DbaAgentJobOwner -SqlInstance localhost
 
        Returns all SQL Agent Jobs where the owner does not match 'sa'.
 
    .EXAMPLE
        PS C:\> Test-DbaAgentJobOwner -SqlInstance localhost -ExcludeJob 'syspolicy_purge_history'
 
        Returns SQL Agent Jobs except for the syspolicy_purge_history job
 
    .EXAMPLE
        PS C:\> Test-DbaAgentJobOwner -SqlInstance localhost -Login DOMAIN\account
 
        Returns all SQL Agent Jobs where the owner does not match DOMAIN\account. Note
        that Login must be a valid security principal that exists on the target server.
 
    #>

    [CmdletBinding()]
    [OutputType('System.Object[]')]
    param (
        [parameter(Mandatory, ValueFromPipeline)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [Alias("Jobs")]
        [object[]]$Job,
        [object[]]$ExcludeJob,
        [Alias("TargetLogin")]
        [string]$Login,
        [switch]$Detailed,
        [Alias('Silent')]
        [switch]$EnableException
    )

    begin {
        Test-DbaDeprecation -DeprecatedOn 1.0.0 -Parameter Detailed
        #connect to the instance and set return array empty
        $return = @()
    }
    process {
        foreach ($instance in $SqlInstance) {
            #connect to the instance
            $server = Connect-SqlInstance $instance -SqlCredential $SqlCredential

            #Validate login
            if ($Login -and ($server.Logins.Name) -notcontains $Login) {
                if ($SqlInstance.count -eq 1) {
                    Stop-Function -Message "Invalid login: $Login."
                    return
                } else {
                    Write-Message -Level Warning -Message "$Login is not a valid login on $instance. Moving on."
                    continue
                }
            }
            if ($Login -and $server.Logins[$Login].LoginType -eq 'WindowsGroup') {
                Stop-Function -Message "$Login is a Windows Group and can not be a job owner."
                return
            }

            #Sets the Default Login to sa if the Login Paramater is not set.
            if (!($PSBoundParameters.ContainsKey('Login'))) {
                $Login = "sa"
            }
            #sql2000 id property is empty -force target login to 'sa' login
            if ($Login -and ( ($server.VersionMajor -lt 9) -and ([string]::IsNullOrEmpty($Login)) )) {
                $Login = "sa"
            }
            # dynamic sa name for orgs who have changed their sa name
            if ($Login -eq "sa") {
                $Login = ($server.Logins | Where-Object { $_.id -eq 1 }).Name
            }

            #Get database list. If value for -Job is passed, massage to make it a string array.
            #Otherwise, use all jobs on the instance where owner not equal to -TargetLogin
            Write-Message -Level Verbose -Message "Gathering jobs to check."
            if ($Job) {
                $jobCollection = $server.JobServer.Jobs | Where-Object { $Job -contains $_.Name }
            } elseif ($ExcludeJob) {
                $jobCollection = $server.JobServer.Jobs | Where-Object { $ExcludeJob -notcontains $_.Name }
            } else {
                $jobCollection = $server.JobServer.Jobs
            }

            #for each database, create custom object for return set.
            foreach ($j in $jobCollection) {
                Write-Message -Level Verbose -Message "Checking $j"
                $row = [ordered]@{
                    Server       = $server.Name
                    Job          = $j.Name
                    JobType      = if ($j.CategoryID -eq 1) { "Remote" } else { $j.JobType }
                    CurrentOwner = $j.OwnerLoginName
                    TargetOwner  = $Login
                    OwnerMatch   = if ($j.CategoryID -eq 1) { $true } else { $j.OwnerLoginName -eq $Login }

                }
                #add each custom object to the return array
                $return += New-Object PSObject -Property $row
            }
            if ($Job) {
                $results = $return
            } else {
                $results = $return | Where-Object {$_.OwnerMatch -eq $False}
            }
        }
    }
    end {
        #return results
        Select-DefaultView -InputObject $results -Property Server, Job, JobType, CurrentOwner, TargetOwner, OwnerMatch
    }

}