Powershell function parameters proper use - powershell

Question

PARAM (
[parameter(Mandatory=$true)]
[string]$Poolname,
[array]$Ports = 443,
[parameter(Mandatory=$true)]
[ValidateSet("ELB","ALB")]
$Loadbalncertype,
[parameter(Mandatory=$true)]
[ValidateSet("Ping","HTTPGet")]
$HealthCheckConfigType,
[parameter(Mandatory=$true)]
[array]$LBSubnets,
[parameter(Mandatory=$true)]
[string]$SecGroupID,
[int]$IdleTimeoutsec = 60,
[bool]$SSLPassthrough = $false,
string]$SSLCertificateName,
[string]$HealthCheckPath,
[string]$SSLPolicyName,
[bool]$ConfigureProxyProtocol = $true
)
In the above I would like to use Parameter $HealthCheckConfigType only if the $Loadbalncertype = ELB. I am not sure how to create this logic in Powershell function parameter section.

Answer 1

To do that in the param definition specifically, you could use DynamicParam to create a dynamic parameter, but that's a lot of work and probably overkill.
The most straightforward method I can think of if you must leave $LoadBalancerType as a [string] is to use [ValidateScript()] like so:
param(
[ValidateSet("ELB","ALB")]
$LoadBalancerType ,
[ValidateScript( { $LoadBalancerType -eq 'ELB' } )]
[ValidateSet("Ping","HTTPGet")]
$HealthCheckConfigType
)
This will give a crappy error message, which you could override with a well-placed throw:
[ValidateScript( { $LoadBalancerType -eq 'ELB' -or $(throw 'A better error message') } )]
Another option is to change your $LoadBalancerType parameter into separate switch parameters, and use them to define parameter sets:
[CmdletBinding(DefaultParameterSet='ALB')]
param(
[parameter(Mandatory=$true)]
[string]$Poolname,
[Parameter(Mandatory, ParameterSetName = 'ALB')]
[Switch]$ALB ,
[Parameter(Mandatory, ParameterSetName = 'ELB')]
[Switch]$ELB ,
[Parameter(Mandatory, ParameterSetName = 'ELB')
[ValidateSet("Ping","HTTPGet")]
$HealthCheckConfigType
)
This lets the parameter parser enforce this restriction, and you can see it in the automatically generated parameter sets by calling Get-Help on your function.
And, even though this isn't the usual way, in your case if you name the parameter sets with the names of the values you wanted, you could recreate $LoadBalancerType without conditionals:
$LoadBalancerType = $PSCmdlet.ParameterSetName
(assuming of course, that the only possible parameter sets are load balancer names directly; be careful with this)
But if you never really needed that string value; i.e. if you were only ever going to do:
if ($LoadBalancerType -eq 'ALB') {
} elseif ($LoadBalancerType -eq 'ELB') {
}
or something like that, then you don't need to recreate it, just do:
if ($ALB) {
} elseif ($ELB) {
}
Alternatively, you don't have to do this check in the param block at all; you can do it in your function body, or begin/process blocks where appropriate.

Answer 2

Use a DynamicParam block: https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_functions_advanced_parameters?view=powershell-6#dynamic-parameters
I don't have a ton of experience with them myself, but here is the code sample from that MS doc. You can process and add any parameters you need:
function Get-Sample {
[CmdletBinding()]
Param ([String]$Name, [String]$Path)
DynamicParam
{
if ($path -match ".HKLM.:")
{
$attributes = New-Object -Type `
System.Management.Automation.ParameterAttribute
$attributes.ParameterSetName = "__AllParameterSets"
$attributes.Mandatory = $false
$attributeCollection = New-Object `
-Type System.Collections.ObjectModel.Collection[System.Attribute]
$attributeCollection.Add($attributes)
$dynParam1 = New-Object -Type `
System.Management.Automation.RuntimeDefinedParameter("dp1", [Int32],
$attributeCollection)
$paramDictionary = New-Object `
-Type System.Management.Automation.RuntimeDefinedParameterDictionary
$paramDictionary.Add("dp1", $dynParam1)
return $paramDictionary
}
}
}
Another option would be to not muck with DynamicParam and in your code body, simply ignore $HealthCheckConfigType if $LoadBalancerType does not equal ELB, but if you want to use parameter validators to check this, DynamicParam is the answer.