how to create conditional arguments in a function?

Question

I have the following function that hides a password middle chars and leaves 1st and last char visible

function Hide-ConnectionStringPassword {
    param(
       [parameter(Mandatory,ValueFromPipeline)]
       [System.Data.SqlClient.SqlConnectionStringBuilder]$ConnectionString
    )
    [string]$FistChar = $ConnectionString.Password[0]
    [string]$LastChar = $ConnectionString.Password[($ConnectionString.Password.Length - 1)]
    [string]$Stars = '*' * ($ConnectionString.Password.Length - 2)
    $ConnectionString.Password = $FistChar + $Stars + $LastChar 
    return $ConnectionString.ConnectionString
}

Usage:

Hide-ConnectionStringPassword 'Connection Timeout=120;User Id=UID1;Data Source=datasource.com;Password=password12!553;'

output:

Data Source=datasource.com;User ID=UID1;Password=p************3;Connect Timeout=120

I have other connection strings that are JSON formatted, so the casting to sqlbuilder will not work on this type of input

{"Authentication Kind":"UsernamePassword","Username":"someID1","Password":"Yu#gh456!ts","EncryptConnection":true}

One thing i could do is something like this:

$Json = '{"Authentication Kind":"UsernamePassword","Username":"someID1","Password":"Yu#gh456!ts","EncryptConnection":true}'
$Sql = $Json | ConvertFrom-Json
$Sql.Password

with

$Sql.gettype().name

i get

PSCustomObject

i would like to apply that in the function such that it checks string input is type pscustomobject so that it doesnt cast it as sqlbuilder

pseudocode:

function Hide-ConnectionStringPassword {
    if ($input.gettype().name -ne 'PSCustomObject')
    {
    param(
       [parameter(Mandatory,ValueFromPipeline)]
       [System.Data.SqlClient.SqlConnectionStringBuilder]$ConnectionString
    )}
    else
    {
    param(
       [parameter(Mandatory,ValueFromPipeline)]
       $ConnectionString
    )}
    [string]$FistChar = $ConnectionString.Password[0]
    [string]$LastChar = $ConnectionString.Password[($ConnectionString.Password.Length - 1)]
    [string]$Stars = '*' * ($ConnectionString.Password.Length - 2)
    $ConnectionString.Password = $FistChar + $Stars + $LastChar 
    return $ConnectionString.ConnectionString
}

Why not just remove the hard typing in the parameter and do the type conversion in the Begin {} area of your function? You can do the if-else stuff there. — AdminOfThings
– AdminOfThings, Commented Jul 9, 2019 at 16:34

AdminOfThings · Accepted Answer · 2019-07-09 16:42:55Z

1

You could just remove the hard typing in the parameter. Then move the if-else logic to the script Process {} or Begin {} script blocks.

function Hide-ConnectionStringPassword {

    param(
       [parameter(Mandatory,ValueFromPipeline)]
       $ConnectionString
    )

    if ($ConnectionString.GetType().Name -ne "PSCustomObject") {
    $ConnectionString = $ConnectionString -as [System.Data.SqlClient.SqlConnectionStringBuilder]
    }

    [string]$FistChar = $ConnectionString.Password[0]
    [string]$LastChar = $ConnectionString.Password[($ConnectionString.Password.Length - 1)]
    [string]$Stars = '*' * ($ConnectionString.Password.Length - 2)
    $ConnectionString.Password = $FistChar + $Stars + $LastChar 
    return $ConnectionString.ConnectionString
}

edited Jul 9, 2019 at 16:42

answered Jul 9, 2019 at 16:34

AdminOfThings

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1 Comment

Cataster Over a year ago

not sure how i didnt think of this. sometimes, brain freeze is a delimma

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