private/Update-ServicePrincipal.ps1

function Update-ServicePrincipal {
    Param ([string]$AppId, [string[]]$Permissions, [bool]$silent)

    $MSI = ( Get-AzureADServicePrincipal -Filter "AppId eq '$appId'" )
    if ( -not $MSI ) {
        $MSI = New-AzureADServicePrincipal -AppId $appId
    }
    $GraphAppId = "00000003-0000-0000-c000-000000000000" #Windows Azure Active Directory
    $GraphServicePrincipal = Get-AzureADServicePrincipal -Filter "appId eq '$GraphAppId'"
    foreach ( $permission in $permissions ) {
        $AppRole = $GraphServicePrincipal.AppRoles | Where-Object { $_.Value -eq $permission -and $_.AllowedMemberTypes -contains "Application" }
        try {
            New-AzureADServiceAppRoleAssignment `
                -ObjectId $MSI.ObjectId `
                -PrincipalId $MSI.ObjectId `
                -ResourceId $GraphServicePrincipal.ObjectId `
                -Id $AppRole.Id | Out-Null
            Write-Output " Granted $permission"
        }
        catch [Microsoft.Open.AzureAD16.Client.ApiException] {
            if ($_.Exception.ErrorContent.Message.Value -match "already exists") {
                if ( -not $silent ){
                    Write-Output " Permission $permission Already Granted"
                }
            }
            else {
                Cleanup-Environment -exitCode 1
            }
        }
    }
}

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