Get-IgniteContent.ps1

# Author Rajesh Sitaraman
# @rjesh | rjesh.com

<#
.SYNOPSIS
Download Ignite 2019 session presentation slides and videos.
.EXAMPLE
PS C:\> .\Get-IgniteContent.ps1 -DownloadPath /Users/rajeshsitaraman/src/public/share/IG-2019 -Keyword "AI"
.EXAMPLE
PS C:\> .\Get-IgniteContent.ps1 -DownloadPath /Users/rajeshsitaraman/src/public/share/IG-2019 -Keyword "Teams" -IncludeVideos
.EXAMPLE
Downloads all sessions -- Might take very long time
PS C:\> .\Get-IgniteContent.ps1 -DownloadPath /Users/rajeshsitaraman/src/public/share/IG-2019
#>

[CmdletBinding()]
Param(
    [Parameter(Mandatory = $true, Position = 1)]
    [String]$DownloadPath,

    [Parameter(Mandatory = $false, Position = 2)]
    [String]$Keyword,

    [Parameter(Mandatory = $false, Position = 3)]
    [Switch]$IncludeVideos
)
$itemsPerPage = 100
$page = 1
$response = $null

If (-Not (Test-Path -Path $DownloadPath -PathType Container)) {
    New-Item -Path $DownloadPath -ItemType directory | Out-Null
}

function Get-File {
    param([Parameter(Mandatory=$true)][string] $FilePath, [Parameter(Mandatory=$true)][string] $URI)
    If ($PSVersionTable.PSEdition -eq "Core") { 
        Invoke-WebRequest -Uri $URI -OutFile $FilePath
    }
    Else {
        Start-BitsTransfer -Source $URI -Destination $FilePath
    }
}

if (!$Keyword) { $searchText = "" } else { $searchText = $Keyword}

do {
    $body = @{     
        "itemsPerPage" = $itemsPerPage
        "searchText" = $searchText
        "searchPage" = $page
        "sortOption" = "None"
        "mustHaveOnDemandVideo" = $true         
    }
    $params = @{
        Headers = @{"Content-type"="application/json"}
        Body = $body | convertto-json
        Method = "Post"
        URI = "https://api-myignite.techcommunity.microsoft.com/api/session/search"
    }
    
    $response = Invoke-RestMethod @params
    
    foreach ($item in $response.data) {
        $name = $item.Title -replace '[\W]', ' '
        $name = $name.Substring(0,[System.Math]::Min(50, $name.Length))
        Write-Host "Downloading -- $($item.sessionCodeNormalized)" -ForegroundColor Green

        # check to see if MP4 already exists if so skip re-downloading it
        $outmp4 = "$DownloadPath/$($item.sessionCodeNormalized)-$name.mp4"
        if (Test-Path $outmp4 -PathType Leaf) {
            Write-Host "MP4 Already Exists"
        }else {
            Write-Host "Downloading MP4"
            if ($item.downloadVideoLink -and $IncludeVideos) {Get-File -URI $item.downloadVideoLink-FilePath $outmp4}
        }

        # check to see if pptx already exists if so skip re-downloading it
        $outpptx = "$DownloadPath/$($item.sessionCodeNormalized)-$name.pptx"
        if (Test-Path $outpptx -PathType Leaf) {
            Write-Host "PPTX Already Exists"
        }else {
            Write-Host "Downloading PPTX"
            if ($item.slideDeck) {Get-File -URI $item.slideDeck -FilePath $outpptx}
        }
    }     
    $page +=1    
} until ($page -gt ($($response.total)/$itemsPerPage))