Query URLs

[katos]

Hi guys!
This script queries shorturl's to attempt to obtain the real address. This is useful for attempting to determining the actual website when a short URL is sent. For example, we use this at work to attempt to determine the final URL before viewing the site within the helpdesk, useful to prevent us landing on a potentially malicious site.

function Resolve-ShortURL {
    <#
.SYNOPSIS
    Function to resolve a short URL to the absolute URI - useful for spam / malicious site checking.
.DESCRIPTION
    Function to resolve a short URL to the absolute URI
.PARAMETER ShortUrl
    Specifies the ShortURL
.EXAMPLE
    Resolve-ShortURL -ShortUrl https://bit.ly/2MRHUiE
.EXAMPLE
    Resolve-ShortURL -ShortUrl https://bit.ly/2MRHUiE
#>

    [CmdletBinding()]
    [OutputType([System.String])]
    PARAM
    (
        [String[]]$ShortUrl
    )

    FOREACH ($URL in $ShortUrl) {
        TRY {
            Write-Verbose -Message "$URL - Querying..."
            (Invoke-WebRequest -Uri $URL -MaximumRedirection 0 -ErrorAction Ignore).Headers.Location
        }
        CATCH {
            $PSCmdlet.ThrowTerminatingError($_)
        }
    }
}