Provides the ability to retrieve the Access Token from the current Context

AzureRmAccessToken.ps1

function Get-AzureRmAccessToken {
    
    <#
    .SYNOPSIS
        Get-AzureRmAccessToken will retrieve the Access Token from the current AzureRm context.
    .DESCRIPTION
        Provides the ability to retrieve the current authenticated Access Token within the AzureRm.Profile context.
        Returns the Access Token to allow for interaction directly with Microsoft Azure REST API's.
    .EXAMPLE
        Get-AzureRmAccessToken
    #>
    
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, ParameterSetName = 'Type')]
        [ValidateSet("Current", "All")]
        [string]$Type
    )

    begin {
        Write-Verbose -Message "Initiating function 'Get-AzureRmAccessToken'."
        Set-Variable -Name "Type" -Scope Private
        $accessTokens = @{}
        $profile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile
        $tenants = ""
    }

    process {
        switch ($Type) {
            "Current" {
                try {
                    $context = Get-AzureRmContext
                    $client = New-Object Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient($Profile)
                    $token = $client.AcquireAccessToken($Context.Subscription.TenantId)
                    $accessToken = $token.AccessToken
                }
                catch {
                    Write-Error -Message $_.Exception.Message
                    Break
                }        
            }
            "All" {
                try {
                    foreach ($tenant in $tenants) {
                        Set-AzureRmContext -Tenant $tenant | Out-Null
                        $context = Get-AzureRmContext
                        $Client = New-Object Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient($Profile)
                        $token = $client.AcquireAccessToken($context.Subscription.TenantId)
                        $accessToken = $Token.AccessToken
                        $accessTokens.Add($tenant, $accessToken)
                    }
                } catch {
                    Write-Error -Message $_.Exception.Message
                    Break
                }
            }
        }
    }

    end {
        Write-Verbose -Message "Initiating function 'Get-AzureRmAccessToken' completed."
        switch ($type) {
            "Current" {
                Return $accessToken
            }
            "All" {
                Return $accessTokens
            }
        }

    }

}