Public/Get-PlexLibrary.ps1

function Get-PlexLibrary
{
    <#
        .SYNOPSIS
            By default, returns a list of libraries on a Plex server.
        .DESCRIPTION
            By default, returns a list of libraries on a Plex server.
            If -Id is specified, a single library is returned with
        .PARAMETER PlexServerHostname
            Fully qualified hostname for the Plex server (e.g. myserver.mydomain.com)
        .PARAMETER Protocol
            http or https
        .PARAMETER Port
            Parameter description
        .PARAMETER Id
            If specified, returns a specific library.
        .EXAMPLE
            Get-PlexLibrary
    #>


    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $false)]
        [String]
        $Id
    )

    #############################################################################
    #Region Import Plex Configuration
    if(!$script:PlexConfigData)
    {
        try
        {
            Import-PlexConfiguration -WhatIf:$False
        }
        catch
        {
            throw $_
        }
    }
    #EndRegion

    #############################################################################
    #Region Make request
    try
    {
        $DataUri = Get-PlexAPIUri -RestEndpoint "library/sections/$Id"
        [array]$Data = Invoke-RestMethod -Uri $DataUri -Method GET
        if($Id)
        {
            [array]$Results = $Data.MediaContainer
        }
        else
        {
            [array]$Results = $Data.MediaContainer.Directory
        }
    }
    catch
    {
        throw $_
    }
    #EndRegion

    return $Results
}