# Usage: .\download.ps1 https://www.a.url/to/download filename_for_downloaded.file
# Usage: .\download.ps1 https://www.a.url/to/download filename_for_downloaded.file a_username a_password
$URL=$args[0]
$FILENAME=$args[1]

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
if ($args.count -gt 2) {
    $USERNAME=$args[2]
    $PASSWORD=$args[3]
    
    $AUTH_PAIR=[System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes("$($USERNAME):$($PASSWORD)"))
    $AUTH_HEADERS=@{Authorization="Basic $AUTH_PAIR"}
    Invoke-WebRequest -Uri "${URL}" -OutFile "${FILENAME}" -Headers ${AUTH_HEADERS}
} else {
    Invoke-WebRequest -Uri "${URL}" -OutFile "${FILENAME}"
}