how can i 'instance' Register-ScheduledTask and modify it later?-CodePudding

this is my very first powershell script.
there are some specific things that i know could be different, i just dont know how to do it.

like the Set-ScheduledTask repeated 3 times in the switch, for example.
i whish i knew how to 'instance' the task object outside the switch and add/modify the properties (parameters?) inside, calling it to execute on the last line of the script.

well, any help is greatly appreciated.

#Requires -RunAsAdministrator

# script parameters
[CmdletBinding(SupportsShouldProcess)]
param (
    [ValidateSet('askme', 'hardcoded', 'system')]
    [string]$taskrunner = 'system'
)

# print extra info on screen
$VerbosePreference = "Continue"

# clear screen
Clear-Host

# i always work from the script directory
Set-Location $PSScriptRoot

"
---
Running $($MyInvocation.Line)
---
** description in portuguese about what the script is suposed to do **

Este script importa um xml (previamente exportado do agendador de tarefas)
e agenda esta tarefa simulando um servico, dispensando o logon do usuario.
---
"

$taskname = 'sync-owncloud-as-a-service'
$taskxml = (Get-Content "$taskname.xml" | Out-String)

Register-ScheduledTask -Force -TaskName $taskname -xml $taskxml

switch ($taskrunner) {
    'askme' {  
        $credential = Get-Credential -Message 'account credentials to run the task' -Title '--- ATENCAO ---'
        $taskuser = $credential.UserName
        $taskpassword = $credential.GetNetworkCredential().Password
        Set-ScheduledTask -TaskName $taskname -User $taskuser -Password $taskpassword
    }
    'hardcoded' {  
        $taskuser = 'corp\nonprivilegeduser'
        $taskpassword = 'verystrongpassaword'
        Set-ScheduledTask -TaskName $taskname -User $taskuser -Password $taskpassword
    }
    'system' {  
        $taskprincipal = New-ScheduledTaskPrincipal -UserID "NT AUTHORITY\SYSTEM" -LogonType ServiceAccount -RunLevel Highest
        Set-ScheduledTask -TaskName $taskname -Principal $taskprincipal
    }
    Default {
        '** how do i get here? **'
        Write-Error "Parameter $_ does not apply to this script"
    }
}

# print task info (check if its ok)
Get-ScheduledTaskInfo $taskname

Edit: some terms may sound wrong since i'm not a native english speaker. if i'm not making sense, please feel free to edit my question or ask me to rephrase it.

CodePudding user response：

Congrats on your first script. What you're possibly looking for here is splatting.

# initialize parameters for Set-ScheduledTask
$params = @{
    TaskName = $taskname
}

# configure parameters
switch ($taskrunner) {
    'askme' {  
        $credential = Get-Credential -Message 'account credentials to run the task' -Title '--- ATENCAO ---'
        $params["User"] = $credential.UserName
        $params["Password"] = $credential.GetNetworkCredential().Password
    }
    'hardcoded' {  
        $params["User"] = 'corp\nonprivilegeduser'
        $params["Password"] = 'verystrongpassaword'
    }
    'system' {  
        $params["Principal"] = New-ScheduledTaskPrincipal -UserID "NT AUTHORITY\SYSTEM" -LogonType ServiceAccount -RunLevel Highest
    }
    Default {
        throw "Parameter $_ does not apply to this script"
    }
}

# call Set-ScheduledTask once with the configred parameters
Set-ScheduledTask @params