12 January 2015

Update 5-27-17 — This wont work with Seasons 19 and after as they have removed the download link from each episode page.  Also, Revision3 no longer exists (got folded into Seeker, whatever that is), so who knows how long the older episodes from 1-18 will continue to exist.  The actual download mp4 files were/are hosted on the revision3.com domain.

I’ve never been able to find a REALLY good podcatcher. I use Juice and it works good… as long as it’s always running. I thought I had it set to startup when I login but apparently I hadn’t. I fell off keeping up with Hak5 and then one day I go to start up again and I have no current episodes! It had been months. I left it alone again and there I was yesterday wanting them again. The RSS feed only does the current season so I couldn’t use iTunes or another app to “Download All” as they only saw the current season. I needed to go back two seasons, too. Enter PowerShell.

I figured I could do it. Fuddled with Invoke-WebRequest but it doesn’t work great. The Links property was always missing the link to the HD video file. I ended up having to create a WebClient and download the webpage, then parse it for the HD video file. It didn’t take too long… if you don’t count the typo I made which kept making me download the page for episode 1 of season 1, lol (No HD back then…). I added params and comments and spruced it up a bit for general internet consumption.

###################################################################
##  Description:  Downloads all of the HD videos for the given season of Hak5
##
##  This script is provided as is and may be freely used and distributed so long as proper
##  credit is maintained.
##
##  Written by: thegeek@thecuriousgeek.org
##  Date Modified:  01-12-2015
###################################################################

param(
	[Parameter(Mandatory=$true,Position=1)]
	[string]$season,
	
	[Parameter(Mandatory=$true,Position=2)]
	[int]$first,
	
	[Parameter(Mandatory=$true,Position=3)]
	[int]$last
)

# First I need to check if any of the episode numbers are less than 10
# if so, I need to add a 0 in there to get the correct episode numbers.
If ($first -lt 10) { 
	[int]$first = "$($season)0$first"
}
Else {
	[int]$first = "$($season)$first"
}

If ($last -lt 10) { 
	[int]$last = "$($season)0$last"
}
Else {
	[int]$last = "$($season)$last"
}

# Here I just setup paths for easy use later. Be sure to set Drive to your own drive letter!
$saveDir = "Drive:\Podcasts\Hak5"
$seasonDir = "$saveDir\Season $season"
$url = "http://hak5.org/episodes/hak5-"

# Keeping directory structure.  I test to see if the folder "Season $season"
# exists and if it doesn't it creates it.  The web client will not create it.
If (!(Test-Path $seasonDir)) {
	New-Item $seasonDir -ItemType Directory
}

# Use the first and last episode numbers to go through a loop.  Each one
# is used to create the final URL that will be downloaded for it's source code.
# Thankfully Hak5 is organized and this is easy to do!
For ($i = $first; $i -le $last; $i++) {
	write-host "Working on episode $i"
	$wc = new-object system.net.webclient
	$wc.DownloadFile("$($url)$i","TempLocation")    # I build the URL using the base path I had above and combine it with the episode number from the current iteration of the loop
	$sourceCode = get-content TempLocation    # Be sure to make TempLocation your own path!
	ForEach ($line in $sourceCode) {
		$boolResponse = $line -match "http(.*?)hd720p30\.h264\.mp4"    # This regex expression is saying match a string http (with anything here in the middle) and is followed by hd720p30.h264.mp4
		If ($boolResponse) {
			$fileURL = $matches.0     # the system variable $matches keeps record of all matches you've made.  The query above gives two results, the first is the one I want (complete URL).
			$fileName = $fileURL.Split("/")[$_.Length - 1]     # I need a filename to save as, so I grab the one out of the URL
			$wc.DownloadFile($fileURL,"$seasonDir\$fileName")
		}
	}
}

And then to call it, run the script with parameters such as: DownloadHak5Season.ps1 16 1 26, which tells it to download season 16, episodes 1-26


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