Powershell script to download all of Azure Friday videos from RSS feed

download_azure_friday_videos.ps1

function GetFeedPageCount ($url) {
  $feed=[xml](New-Object System.Net.WebClient).DownloadString($url)
  $pageCount = $feed.rss.channel.pageCount
  return $pageCount;
}

function DownloadFeed ($url) {
  $feed=[xml](New-Object System.Net.WebClient).DownloadString($url)
  foreach($i in $feed.rss.channel.item) {
    $url = New-Object System.Uri($i.enclosure.url)
    $url.ToString()
    $url.Segments[-1]
    $localFile = $url.Segments[-1]
    if (Test-Path($localFile)) {
      Write-Host "Skipping file, already downloaded"
    }
    else
    {
      Invoke-WebRequest $url -OutFile $url.Segments[-1]
    }
  }
}

# This sample code assumes the RSS feed returns a pageCount
# eg: rss/channel/pageCount
# as well as accepts ?page= as a parameter
#
# Based on code by Scott Hanselman
# Source: http://www.hanselman.com/blog/Mix11VideosDownloadThemAllWithRSS.aspx
#
# Related blog post here: http://blogs.msdn.com/b/cdndevs/archive/2014/11/18/azure-fridays-a-powershell-script-to-download-rss-videos.aspx

$feedUrl = "http://channel9.msdn.com/Shows/Azure-Friday/feed/mp4high"
$pageCount = GetFeedPageCount($feedUrl)

for ($i = 1; $i -le $pageCount; $i++) {
  Write-Host "Downloading page $i of $pageCount"
  DownloadFeed($feedUrl + "?page=" + $i)
}