Install-FSLogix-Apps.ps1

## Install FSLogix
## Specialised Assistance School for Youth
## v2.0

## This script checks the current version of FSLogix based on the short URL redirected filename
## (eg: FSLogix_Apps_2.9.8440.42104.zip) and installs if FSLogix is not installed, or is older
## than the currently installed version. Version comparison uses [System.Version] object type cast
## to ensure any major version numbers are accounted for.

## The script will extract just the 64 bit FSLogix Apps installer exe from the downloaded zip

## Caveats: If MS changes the short URL, the redirection, or the path/filename within the zip
##          then the script will break.
##          It is strongly recommended not to autorun this script due to unexpected bugs in FSLogix

$FSLogixURL = "https://aka.ms/fslogix/download"
$FSLogixDownload = "FSLogixSetup.zip"
$FSLogixInstaller = "FSLogixAppsSetup.exe"
$ZipFileToExtract = "x64/Release/FSLogixAppsSetup.exe"
$Zip = "$env:temp\$FSLogixDownload"
$Installer = "$env:temp\$FSLogixInstaller"
$downloadAndInstall = $false

$ProductName = "Microsoft FSLogix Apps"

Write-Host "Checking registry for $ProductName"

# Get FSLogix version number if installed
$fslogixsearch = (get-wmiobject Win32_Product | where-object name -eq "Microsoft FSLogix Apps" | select-object Version)

switch ($fslogixsearch.count) {
    0 {
        # Not found
        $fslogixver = $null
        $downloadAndInstall = $true
    }
    1 {
        # One entry returned
        $fslogixver = [System.Version]$fslogixsearch.Version
        Write-Host "FSLogix version installed: $fslogixver"
    }
    {$_ -gt 1} {
        # two or more returned
        $fslogixver = [System.Version]$fslogixsearch[0].Version
        Write-Host "FSLogix version installed: $fslogixver"
    }

}

# Find current FSLogix version from short URL:
$WebRequest = [System.Net.WebRequest]::create($FSLogixURL)
$WebResponse = $WebRequest.GetResponse()
$ActualDownloadURL = $WebResponse.ResponseUri.AbsoluteUri
$WebResponse.Close()

$FSLogixCurrentVersion = [System.Version]((Split-Path $ActualDownloadURL -leaf).Split("_")[2]).Replace(".zip","")

Write-Host "Current FSLogix version: $FSLogixCurrentVersion"

# See if the current version is newer than the installed version:
if ($FSLogixCurrentVersion -gt $fslogixver) {
    # Current version greater than installed version, install new version
    Write-Host "New version will be downloaded and installed. ($FSLogixCurrentVersion > $fslogixver)"
    $downloadAndInstall = $true
}

# If $downloadAndInstall has been toggled true, download and install.
if ($downloadAndInstall)
{
    Write-Host "Not installed... beginning install..."
    # Download installer
    Import-Module BitsTransfer
    Write-Host "Downloading from: $FSLogixURL"
    Write-Host "Saving file to: $Zip"

    Start-BitsTransfer -Source $FSLogixURL -Destination "$env:temp\$FSLogixDownload" -RetryInterval 60

    # Extract file from zip: x64\Release\FSLogixAppsSetup.exe to $env:temp\FSLogixAppsSetup.exe
    
    # Open zip
    Add-Type -Assembly System.IO.Compression.FileSystem
    $zipFile = [IO.Compression.ZipFile]::OpenRead($Zip)
    
    # Retrieve the $ZipFileToExtract and extract to $Installer
    $filetoextract = ($zipFile.Entries | Where-Object {$_.FullName -eq $ZipFileToExtract})
    [System.IO.Compression.ZipFileExtensions]::ExtractToFile($filetoextract[0], $Installer, $true)
    
    # Run installer
    Write-Host "Running $Installer /install /quiet /norestart"
    Start-Process $Installer -wait -ArgumentList "/install /quiet /norestart"

    # Wait for 5 minutes so that the files can be deleted because despite -wait being specified, it doesn't actually wait for all processes to finish
    Start-Sleep -Seconds 300

    # Close the zip file so it can be deleted
    $zipFile.Dispose()

    # Clean up
    Write-Host "Cleaning up, deleting $Installer and $Zip."
    Remove-Item -Path $Installer -Force
    Remove-Item -Path $Zip -Force
}
else {
    Write-Host "FSLogix already installed and up to date."

}