Powershell to download Dungeon, Dragon, and ArtGallery from D&D Insider

Needed to learn some PowerShell stuff, so practiced by creating PowerShell that will download all the Dungeon magazines, Dragon magazines, and Art Gallery files from D&D Insider. Requires a current DDI subscription.

Will create "Dungeon", "Dragon", and "ArtGallery" directories under whatever directory from which you run the commands.

In PowerShell, paste the code below. Change the $username and $password variables to your DDI login info, then type "download" and hopefully it will download all the files. It is a bit slow (took nearly an hour for me.)

(Do not try it as a script because Windows has PowerShell scripts turned off by default and I did not test it as a script so not sure if it will run as a script.)

Code:

---

[Net.ServicePointManager]::SecurityProtocol = "tls12, tls11, tls"


$ddiBaseUrl = "https://ddi.wizards.com"
$dragonUrl = $ddiBaseUrl + "/ContentArchive.aspx?type=Dragon"
$dungeonUrl = $ddiBaseUrl + "/ContentArchive.aspx?type=Dungeon"
$artUrl = $ddiBaseUrl + "/ContentArchive.aspx?type=ArtGallery"


function BuildAuthenticationInfo($loginForm)
{
 $body = "__EVENTTARGET=" + [uri]::EscapeDataString($loginForm.fields["__EVENTTARGET"])
 $body += "&__EVENTARGUMENT=" + [uri]::EscapeDataString($loginForm.fields["__EVENTARGUMENT"])
 $body += "&__VIEWSTATE=" + [uri]::EscapeDataString($loginForm.fields["__VIEWSTATE"])
 $body += "&__VIEWSTATEGENERATOR=" + [uri]::EscapeDataString($loginForm.fields["__VIEWSTATEGENERATOR"])
 $body += "&__EVENTVALIDATION=" + [uri]::EscapeDataString($loginForm.fields["__EVENTVALIDATION"])
 $body += "&ctl00%24ctl00%24ctl00%24ctl00%24SiteContent%24DnDContent%24MainDnDContent%24LeftColumn%24UserName=" + [uri]::EscapeDataString($username)
 $body += "&ctl00%24ctl00%24ctl00%24ctl00%24SiteContent%24DnDContent%24MainDnDContent%24LeftColumn%24Password=" + [uri]::EscapeDataString($password)
 $body += "&ctl00%24ctl00%24ctl00%24ctl00%24SiteContent%24DnDContent%24MainDnDContent%24LeftColumn%24Login=GO"
 return $body
}


function WebRequest([string]$url)
{
 $response = Invoke-WebRequest -method POST -URI $url -Body $global:authenticationInfo -ContentType "application/x-www-form-urlencoded" -WebSession $global:session
 return $response
}


function WebDownload([string]$url, [string]$downloadName)
{
 Invoke-WebRequest -method POST -URI $url -Body $global:authenticationInfo -ContentType "application/x-www-form-urlencoded" -WebSession $global:session -OutFile $downloadName
}


function ValidDownloadLinks($request) { $request.ParsedHtml.getElementsByTagName("a") | Where { $_.href.Contains("Download.aspx") } }


function GoodDownloadName($element) { return ((($element.ParentNode).ParentNode).Children[0]).innerHTML.Trim() -replace '[:]','' }


function MakeDownloadList($url)
{
 $list = @{}
 $page = WebRequest($url)
 $links = ValidDownloadLinks($page)
 $links | ForEach-Object {
  $link = $_
 
  $downloadLink = $link.href
  $downloadLink = $downloadLink.Replace("about:", $ddiBaseUrl);
 
  $downloadName = GoodDownloadName($link);
  $fileExtension = $downloadLink.Substring($downloadLink.Length - 4);
  $downloadName += $fileExtension
 
  $list.Add($downloadName, $downloadLink);
 }
 
 return $list
}


function SetOutputDirectory([string]$directory)
{
 New-Item -Path . -Name $directory -ItemType "directory" | Out-Null
 Set-Location -Path $directory
}


function DownloadFiles([string]$url)
{
 $downloadList = MakeDownloadList($url)
 DownloadEachFile($downloadList)
}


function DownloadEachFile($downloadList)
{
 foreach ($downloadName in $downloadList.Keys)
 {
  $startTime = (GET-DATE)
  Write-Host -NoNewLine "Downloading:" $downloadName "..."
  $downloadLink = $downloadList[$downloadName]
  WebDownload $downloadLink $downloadName
 
  $endTime = (GET-DATE)
  $totalTime = New-TimeSpan -Start $startTime -End $endTime
  $secondsToDownload = " {0,4:f1} seconds" -f $totalTime.TotalSeconds
  Write-Host $secondsToDownload
 }
}


function Download()
{
 Write-Host "Starting"
 
 $ddiLoginPage = Invoke-WebRequest $ddiBaseUrl -SessionVariable global:session
 $loginForm = $ddiLoginPage.Forms["aspnetForm"]
 $global:authenticationInfo = BuildAuthenticationInfo($loginForm)
 $loginResponse = WebRequest($ddiBaseUrl + "/" + $loginForm.Action)
 $logOutButton = $loginResponse.ParsedHtml.getElementById("ctl00_ctl00_ctl00_ctl00_SiteContent_LogoutButton")
 if ($logoutButton.GetType().Name -eq "DBNull")
 {
  Write-Host "Failed to login - make sure you set username and password variables"
 }
 else
 {
  DownloadEachGroup
  Write-Host "done"
 }
}


function DownloadEachGroup()
{
 SetOutputDirectory("Dragon")
 DownloadFiles($dragonUrl)
 Set-Location -Path ..
 SetOutputDirectory("Dungeon")
 DownloadFiles($dungeonUrl)
 Set-Location -Path ..
 SetOutputDirectory("ArtGallery")
 DownloadFiles($artUrl)
 Set-Location -Path ..
}


$username = "YourDDIUserNameHere"
$password = "YourDDIPasswordHere"

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