Download #MVA Content with PowerShell

#source - http://gallery.technet.microsoft.com/scriptcenter/Remove-Invalid-Characters-39fa17b1#changed slightly for MSVA scriptFunction Remove-InvalidFileNameChars {    <#    .SYNOPSIS    This is a PowerShell function to remove invalid characters from strings to be used as file names.    .DESCRIPTION    The function takes a string parameter called Name and returns a string that has been stripped of invalid file name characters, i.e. *, :, \, /.  The Name parameter will also receive input from the pipeline.    .PARAMETER Name    Specifies the file name to strip of invalid characters.    .INPUTS    Parameter Name accepts System.String objects from the pipeline.    .OUTPUTS    System.String.  Outpus a string object    .EXAMPLE    Remove-InvalidFileNameChars -Name "<This/name\is*an:illegal?filename>"    PS C:\>Thisnameisanillegalfilename    .NOTES    It would be easiest to copy the function from the script file and place it in your profile.  However, you may also dot-source the script to load the function into PowerShell:    i.e. PS C:\>. .\Remove-InvalidFileNameChars.ps1    #>    [CmdletBinding()]    param([Parameter(Mandatory=$true,        Position=0,        ValueFromPipeline=$true,         ValueFromPipelineByPropertyName=$true)]        [String]$Name    )    $result = [RegEx]::Replace($Name, "[{0}]" -f ([RegEx]::Escape([String][System.IO.Path]::GetInvalidFileNameChars())), '')    $result = $result.Replace("Microsoft-Virtual-Academy", "")    while($result.Contains("--"))    {        $result = $result.Replace("--", "-")    }    return $result.Trim("-")}

clsWrite-Output ""Write-Output ""Write-Output ""Write-Output ""Write-Output ""Write-Output ""Write-Output ""Write-Output ""Write-Output ""Write-Output ""Write-Output "Starting"$certPages = $("mcsd-application-lifecycle-management","mcsd-windows-store-apps-certification","mcsd-web-apps-certification")$baseSaveLocation = "Z:\Learning\Microsoft Virtual Academy"$pathToRemoveInvalidFileNameCharsScript = "$baseSaveLocation\Remove-InvalidFileNameChars.ps1"#------------Don't edit below here----------------#. "$pathToRemoveInvalidFileNameCharsScript"    foreach($certPage in $certPages){    $certUrl="http://www.microsoft.com/learning/en-us/$certPage.aspx"    Write-Output "Downloading Page: $certUrl"    $pageHtml=invoke-webrequest -uri $certUrl    $destination="$baseSaveLocation\$(Remove-InvalidFileNameChars $certPage.Replace(" ","-"))"    if (!(Test-Path $destination)) {        New-Item -ItemType directory -Path $destination    }        $filteredLinks = $pageHtml.Links | Where-Object { $_.href.ToLower().StartsWith("http://www.microsoftvirtualacademy.com/training-courses/") }     foreach($link in $filteredLinks)    {                Write-Output "Downloading Page: $($link.href)"        $trainingPageHtml=invoke-webrequest -uri $link.href                [string]$trainingTitle = $trainingPageHtml.AllElements | Where-Object { $_.tagName.ToLower().StartsWith("title") } | Select-Object -ExpandProperty innerText {$_}        $trainingTitle = $trainingTitle.Trim()        $trainingDestination="$destination\$($link.innerText)-$(Remove-InvalidFileNameChars $trainingTitle.Replace(" ","-"))"        if (!(Test-Path $trainingDestination)) {            New-Item -ItemType directory -Path $trainingDestination        }        $idEducationTypePattern = [regex]"parent='(?<idEducationType>[^']*)'"        [int]$idEducationType = $idEducationTypePattern.Match($trainingPageHtml.Content).Groups["idEducationType"].Value        $jsonPostDataPattern = [regex]'showNextPanelEducationTypes((?<idEducationTypeSelected>[^"]*),(?<idEducationLevelSelected>[^"]*),(?<isApproved>[^"]*),(?<numControl>[^"]*),this)'        foreach($jsonPostData in $jsonPostDataPattern.Matches($trainingPageHtml.Content))        {            [int]$idEducationTypeSelected = $jsonPostData.Groups["idEducationTypeSelected"].Value.TrimStart("(")            [int]$idEducationLevelSelected = $jsonPostData.Groups["idEducationLevelSelected"].Value            [int]$numControl = $jsonPostData.Groups["numControl"].Value            $isApproved = $jsonPostData.Groups["isApproved"].Value            $jsonPostUri = "http://www.microsoftvirtualacademy.com/Studies/EducationDetails.aspx/ShowNextPanelEducationTypes"            $jsonPostBody = @{                    idEducationTypeSelected = "$idEducationTypeSelected";                    idEducationLevelSelected = $idEducationLevelSelected;                    isSubscribe = $true;                    selectedIsEnabled = "true";                    numControl = $numControl;                    idEducationType = "$idEducationType";                    isApproved = "$isApproved";                    culture="en-US"                 }| ConvertTo-Json             $jsonInvokeResult = Invoke-RestMethod -Method Post -Uri $jsonPostUri -ContentType "application/json" -Body $jsonPostBody                     $ctIDPattern = [regex]'openEmbeddedVideo((?<Id>.+));'            foreach($ctID in $ctIDPattern.Matches($jsonInvokeResult.d.HtmlResponseMaterials))            {                $Id = $ctID.Groups["Id"].Value.TrimStart("(").Split(',')[0]                $uriForTrainingVideo = "http://www.microsoftvirtualacademy.com/Content/ViewContent.aspx?et=$idEducationType&m=$idEducationTypeSelected&ct=$Id"                            Write-Output "Downloading Page: $uriForTrainingVideo"                $trainingVideoPageHtml=invoke-webrequest -uri $uriForTrainingVideo                        [string]$trainingVideoTitle = $trainingVideoPageHtml.AllElements | Where-Object { $_.tagName.ToLower().StartsWith("title") } | Select-Object -ExpandProperty innerText {$_}                 $trainingVideoTitle = $trainingVideoTitle.Trim()                [string]$videoMp4Link = $trainingVideoPageHtml.Links | Where-Object {$_.href.EndsWith(".mp4") -and $_.outerText -eq "MP4"} | Select-Object -ExpandProperty href {$_}                 $urlFileName = $($videoMp4Link.split("/")[-1])                $videoMp4LocalFullName = "$($trainingDestination +"\" + $(Remove-InvalidFileNameChars $trainingVideoTitle.Replace(" ","-"))).mp4"                if(!(Test-Path ($videoMp4LocalFullName)))                 {                    Write-Output "Downloading Video: $trainingVideoTitle to $videoMp4LocalFullName"                    Start-BitsTransfer "$videoMp4Link" $videoMp4LocalFullName                }            }        }    }}Write-Output "Done"

$baseSaveLocation - Set this to the location you want to save the videos to

$certPages - This is an array of certification page names that you want to download content from, i.e.: for MCSD: Application Lifecycle Management which has a url [http://www.microsoft.com/learning/en-us/mcsd-application-lifecycle-management.aspx](http://www.microsoft.com/learning/en-us/mcsd-application-lifecycle-management.aspx "http://www.microsoft.com/learning/en-us/mcsd-application-lifecycle-management.aspx"), the page name would be mcsd-application-lifecycle-management. Note that you will exclude the extension.

$pathToRemoveInvalidFileNameCharsScript - This can stay the same unless you have placed the first script in a difference location to the base location.