Provides the ability to retrieve Resource Groups via REST API

AzureRmResourceGroups.ps1

function Get-AzureRmResourceGroups {

    <#
    .SYNOPSIS
        Get-AzureRmResourceGroups will retrieve all Resource Groups within a Subscription.
    .DESCRIPTION
        Provides the ability to retrieve all Resource Groups from a specific Subscription Id via REST API.
    .EXAMPLE
        Get-AzureRmResourceGroups -SubscriptionId $subscriptionId -AccessToken $accessToken.
    .LINK
        https://gist.github.com/ljtill
    #>

    [CmdletBinding()]
    param (
        [Parameter()]
        [string]$SubscriptionId,

        [Parameter()]
        [string]$AccessToken
    )

    begin {
        $apiVersion = "2018-02-01"
        $request = @{
            Method = "GET"
            Uri = ("https://management.azure.com/subscriptions/" + $subscriptionId + "/resourcegroups?api-version=" + $apiVersion)
            Headers = @{
                "Authorization" = ("Bearer " + $accessToken)
                "Accept" = "application/json"
            }
            Body = $null
        }
    }

    process {
        $response = Invoke-RestMethod @request
    }

    end {
        return $response.value
    }

}