Install Mkcert RootCA in Windows

Install-rootCA-Windows.ps1

###########################################################
# AUTHOR  : LichLord91@github.com
# DATE    : 10.06.21
# Edit    : N/A
# COMMENT : This script installs rootCA.pem from the 
# Mkcert program if it exists and replaces any old certs if 
# thumbprints are different.
# VERSION : 1.0.0 
###########################################################

# Clear any existing error messages and set all errors to stop script if found
$Error.clear()
$ErrorActionPreference = "STOP"
Set-StrictMode -Version latest



##Requires -RunAsAdministrator

try {
    #Load Windows Forms and set TopMost to true for putting forms.messagebox in the foreground
    [System.Reflection.Assembly]::LoadWithPartialName('System.Windows.Forms') > $null
    $form = New-Object System.Windows.Forms.Form
    $form.TopMost = $True
    #Check to see if script is running as admin and if not relaunch it as admin
    If (!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
        Start-Process PowerShell -WindowStyle Hidden -Verb RunAs "-NoProfile -ExecutionPolicy Bypass -Command `"cd '$pwd'; & '$PSCommandPath';`"";
        Exit 0;
    }
}
catch {
    [System.Windows.Forms.MessageBox]::Show($form,"Error Message:`n$($_.Exception.Message)",'Task Failed Successfully','OK','Error') 
    Exit 1;
}


try {

    #Get Current running directory path
    $RunPath = Split-Path -parent $MyInvocation.MyCommand.Definition
    $rootCA = "$($RunPath)\rootCA.pem"

    #Check to see if rooCA.pem file exists
    If (!(Test-Path "$($rootCA)")) { Throw "$($rootCA) does not exist!"}

    #Get Certificate(s) properties
    $OldCert = Get-ChildItem -LiteralPath 'Cert:\CurrentUser\Root' -Recurse | Where-Object {$_.Issuer -like '*mkcert*'}| Select-Object *
    $NewCert = Get-PfxCertificate -Filepath "$($rootCA)"
    $TextParse = 'Microsoft.PowerShell.Security\Certificate::'

    #Check to see if the same cert is already installed by comparing the oldcert (if exists) with the new
    If ($OldCert -and $OldCert.Thumbprint -eq $NewCert.Thumbprint)
    {
        [System.Windows.Forms.MessageBox]::Show($form,"MKcert rootCA is already installed!`nIssuer:`n$($OldCert.Issuer)`nPath:`n$($OldCert.PsPath.Replace($TextParse,"Cert:"))`n Press Ctrl-C to copy message ",'No Further Action Required','OK','Warning') 
        Exit 0;
    }
    #Else compare the thumbprints again and if different uninstall old cert with new cert.
    elseif ($OldCert -and $OldCert.Thumbprint -ne $NewCert.Thumbprint) 
    {
        Remove-Item -Path $OldCert.PSPath -Force
        Import-Certificate -Path "$($rootCA)" -CertStoreLocation cert:\CurrentUser\Root > $null
        $CheckCert = Get-ChildItem -LiteralPath 'Cert:\CurrentUser\Root' -Recurse | Where-Object {$_.Issuer -like '*mkcert*'} | Select-Object *
        [System.Windows.Forms.MessageBox]::Show($form,"New rootCA installed and old one removed `n  New Cert Location: $($CheckCert.PSPath.Replace($TextParse,"Cert:")) `n New Cert Thumbprint: $($NewCert.Thumbprint) `n Old Cert Thumbprint: $($OldCert.Thumbprint)`n Press Ctrl-C to copy message",'Certificate Installed Successfully','OK','Exclamation') 
        Exit 0;
    }
    #Install new cert if all previous checks are false
    Import-Certificate -FilePath "$($rootCA)" -CertStoreLocation cert:\CurrentUser\Root > $null
    $CheckCert = Get-ChildItem -LiteralPath 'Cert:\CurrentUser\Root' -Recurse | Where-Object {$_.Issuer -like '*mkcert*'} | Select-Object *
    [System.Windows.Forms.MessageBox]::Show($form,"New rootCA installed: `n Location: $($CheckCert.PSPath.Replace($TextParse,"Cert:")) `n Press Ctrl-C to copy message",'Certificate Install Success','OK','Information')
    Exit 0;
}
catch {
    #Catch all errors and prompt user
    [System.Windows.Forms.MessageBox]::Show($form,"Error Message:`n$($_.Exception.Message)`n`nError in Line:`n$($_.InvocationInfo.Line)`nError in Line Number: $($_.InvocationInfo.ScriptLineNumber) `n Press Ctrl-C to copy message",'Task Failed Successfully','OK','Error') 
    Exit 1;
}

Finally {
    #Clear out error variable and set prefernce back to Continue
    $Error.Clear()
    $ErrorActionPreference = "Continue"
 }