Add extension to Chrome

Add-ChromeExtensions.ps1

[CmdletBinding()]
param()

Function Get-RegistryKeyPropertiesAndValues
{
 Param(
     [Parameter(Mandatory=$true)]
     [string]$path
)

    Push-Location

    Set-Location -Path $path

    Get-Item . |
    Select-Object -ExpandProperty property |
    ForEach-Object {
        New-Object psobject -Property @{"name"=$_; "Value" = (Get-ItemProperty -Path . -Name $_).$_}
    }

    Pop-Location
}

$registryKey = "HKLM:\SOFTWARE\Policies\Google\Chrome\ExtensionInstallWhitelist"
$forceChromeExtensinkey = "HKLM:\SOFTWARE\Policies\Google\Chrome\ExtensionInstallForcelist"

$currentAllowedExtensions = Get-RegistryKeyPropertiesAndValues $registryKey 
$currentAllowedValues = $currentAllowedExtensions | Select-Object -ExpandProperty "Value"
$lastExtensionNumber = $currentAllowedExtensions  | Select-Object -ExpandProperty "name" | Measure-Object -Maximum | Select-Object -ExpandProperty Maximum

$forceExtensionTemplate = "{0};http://clients2.google.com/service/update2/crx?response=updatecheck&x=id%3D{0}"
$lastForcedExtensionNumber = Get-RegistryKeyPropertiesAndValues $forceChromeExtensinkey | Select-Object -ExpandProperty "name" | Measure-Object -Maximum | Select-Object -ExpandProperty Maximum

$myExtensions = Get-Content "ChromeExtensions.json" -Raw | ConvertFrom-Json | ForEach-Object { 
    $_ | Select-Object -ExpandProperty Id
}

Compare-Object $myExtensions $currentAllowedValues | 
Where-Object {$_.sideindicator -eq "<="} | 
ForEach-Object { 
    $lastExtensionNumber = $lastExtensionNumber + 1        
    New-ItemProperty -Path $registryKey -Name $lastExtensionNumber -Value $_.inputobject -PropertyType String -Force   

    $lastForcedExtensionNumber = $lastForcedExtensionNumber + 1
    $forceExtensionValue = $forceExtensionTemplate -f $_.inputobject

    New-ItemProperty -Path $forceChromeExtensinkey -Name $lastForcedExtensionNumber -Value $forceExtensionValue -PropertyType String -Force    
}

ChromeExtensions.json

[
  { "Name": "Postman", "Id" : "fhbjgbiflinjbdggehcddcbncdddomop"  },
  { "Name": "Grammarly", "Id" : "kbfnbcaeplbcioakkpcpgfkobkghlhen"  }
]