[Powershell] Auto packaging files by Powershell scripts

This is a script for packaging files and calculating MD5Sum as following steps.

1. Get 3 parameters working folder, zip file name, and target file name
2. Check if archive tool(7zip/WinRAR) existed in the working folder
3. Get 7zip command from my FTP server
4. Check if file/folder existed
5. Archive target file into a zip file
6. Calculate MD5Sum of the zip file

#Installer package

$DebugPreference = "Continue" # Default is SilentlyContinue

if($args.Count -ne 3){
  Write-Error "args.count=$($args.Count). It should be 3"
  return
}

$zip7FilePath="$PSScriptRoot\7zip\7za.exe"
$winrarFilePath="C:\Program Files\WinRAR\WinRAR.exe"
$solutionDir=$args[0] -replace "`n","" 
$archivedFilePath=$args[1] -replace "`n",""
$installerFilePath=$args[2] -replace "`n",""

# Return true if all required data exist
function checkRequiredData ($solutionDir) {
  Write-Debug "winrarFilePath=`"$winrarFilePath`""
  Write-Debug "7zipFilePath=`"$zip7FilePath`""
  if (!(Test-Path $winrarFilePath)){
    # WinRAR does not exist
    Write-Debug "`"$winrarFilePath`" doesn't exist, try to detect 7zip"
    if (!(Test-Path $zip7FilePath)){
      # 7za.exe does not exist
      Write-Debug "`"$zip7FilePath`" doesn't exist, try to extract it from zip"
      $url = "ftp://hanping-lab-pc/7zip.zip"
      $output = "$PSScriptRoot\7zip.zip"
      $start_time = Get-Date

      if( !(Test-Path $output)){
        # WinRAR does not exist
        Write-Debug "`"$output`" doesn't exist, try to download it from hanping-lab-pc ftp"
        Invoke-WebRequest -Uri $url -OutFile $output
        Write-Debug "Time taken: $((Get-Date).Subtract($start_time).Seconds) second(s)"
      }
      Expand-Archive -Path "$PSScriptRoot\7zip.zip" -DestinationPath "$PSScriptRoot"
      
      if (!(Test-Path $zip7FilePath)){
        Write-Error "`"$zip7FilePath`" doesn't exist"
        return $false
      }
    }
  }

  Write-Debug "solutionDir=`"$solutionDir`""
  # Check solution dir
  if(!(Test-Path $solutionDir)){
    Write-Error "solutionDir `"$solutionDir`" doesn't exist"
    return $false
  }

  # Check Installer
  Write-Debug "installerFilePath=`"$global:installerFilePath`""
  if(!(Test-Path $global:installerFilePath)){
    Write-Error "installerFilePath `"$global:installerFilePath`" doesn't exist"
    return $false
  }
  return $true
}

function getMD5Hash($fileName) {
  if([System.IO.File]::Exists($fileName)){
    $fileStream = New-Object System.IO.FileStream($fileName,[System.IO.FileMode]::Open,[System.IO.FileAccess]::Read,[System.IO.FileShare]::ReadWrite)
    $md5Hash = New-Object System.Security.Cryptography.MD5CryptoServiceProvider
    [byte[]]$fileByteChecksum = $md5Hash.ComputeHash($fileStream)
    $fileChecksum = ([System.Bitconverter]::ToString($fileByteChecksum)).Replace("-","")
    $fileStream.Close()
  } else {
    $fileChecksum = "ERROR: $fileName Not Found"
  }
  return $fileChecksum
}

function archive () {
  # Compress by WinRAR
  $version = [System.Diagnostics.FileVersionInfo]::GetVersionInfo($global:installerFilePath).FileVersion
  $archivedFilePath = [System.IO.Path]::GetDirectoryName($archivedFilePath) + "\\" + [System.IO.Path]::GetFileNameWithoutExtension($archivedFilePath) + "_$($version).zip"
    # Remove existing archivedFile
  Write-Debug "archivedFilePath=`"$archivedFilePath`""
  if(Test-Path $archivedFilePath){
    Remove-Item $archivedFilePath -Recurse
  }
    if ((Test-Path $winrarFilePath)){
    # WinRAR does exist
      $process = [System.Diagnostics.Process]::Start("$winrarFilePath", "a -m5 -afzip -ep1` `"$archivedFilePath`" `"$global:installerFilePath`"") 
      $process.WaitForExit()
    }
    elseif ((Test-Path $zip7FilePath)){
    # 7-zip does exist
      $process = [System.Diagnostics.Process]::Start("$zip7FilePath", "a -tzip `"$archivedFilePath`" `"$global:installerFilePath`"") 
      $process.WaitForExit()
    }

  # Save MD5 of archivedFilePath as text file
  $md5Hash = (getMD5Hash($archivedFilePath)).toLower()
  Write-Debug "MD5=`"$md5Hash`""
  $dirName = [System.IO.Path]::GetDirectoryName($archivedFilePath)
  $fileNameWithoutExt = [System.IO.Path]::GetFileNameWithoutExtension($archivedFilePath)
  $md5FilePath = Join-Path -Path $dirName -ChildPath ("$($fileNameWithoutExt)_MD5.txt")
  Write-Debug "md5FilePath=`"$md5FilePath`""
  $md5Hash | Set-Content $md5FilePath
}

#main region

Write-Debug "solutionDir=`"$solutionDir`""

if(checkRequiredData($solutionDir) == $true){
  archive
}