cDownloadFile

1.5.0

cDownloadFile.psm1

[DscResource()]
class cDownloadFile
{

    #This property is the url of the file to be downloaded
    [DscProperty(Key)]
    [string]$Url

    #This is the fully qualified path for the file that is expected to be 'Present' or 'Absent'
    [DscProperty(Mandatory)]
    [string]$OutputFolderPath

    [DscProperty()]
    [bool] $UpdateOnDiff

    [DscProperty()]
    [string]$SASToken

    [void]Set()
    {
        write-verbose "Starting download from url: $($this.Url + $this.SASToken)"
        $filePath = (Resolve-Path $this.OutputFolderPath).Path
        if((Get-Item $filePath)-is [System.IO.DirectoryInfo]){
            $fileName = $this.Url.Split('/')[-1]
            $filePath = $filePath + "\" + $fileName
        }
        if($this.SASToken -ne $null){
            $downloadUrl = $this.Url + $this.SASToken
            $client = New-Object System.Net.WebClient
            $client.DownloadFile($downloadUrl, $filePath)
        }else{
            $client = New-Object System.Net.WebClient
            $client.DownloadFile($this.Url,$filePath)
        }
        
    }

    [bool]Test()
    {
        
        Write-Verbose "Checking if $($this.OutputFolderPath) exists"
        
        try
        {
            $filePath = (Resolve-Path $this.OutputFolderPath).Path
        }
        catch
        {
            throw New-Object -TypeName System.InvalidOperationException -ArgumentList "OutputFolderPath should be a valid existing folder"

        }
        if($this.SASToken -ne $null)
        {
            $downloadUrl = $this.Url + $this.SASToken
        }
        else
        {
            $downloadUrl = $this.Url
        }
        Write-Verbose "file url = $downloadUrl"

        $client = New-Object System.Net.WebClient
        $client.OpenRead($downloadUrl)
        $ServerFileLength = $client.ResponseHeaders['Content-Length']
        Write-Verbose "Length = $ServerFileLength"
        $fileName = $this.Url.Split('/')[-1]
        Write-Verbose "FileName = $fileName" 
        $IsFileThere = Test-Path $filePath
        if((Get-Item $filePath)-is [System.IO.DirectoryInfo]){
            $filePath = $filePath + "\" + $fileName
           $IsFileThere = Test-Path $filePath
        }
        

        if($IsFileThere){
            Write-Verbose "File Exists"
            if(!$this.UpdateOnDiff){
                return $true
            }

            $file = Get-Item $filePath

            if($ServerFileLength -eq $file.Length){
                Write-Verbose 'File on server is identical to from existing file.'
                return $true
            }
        }
        Write-Verbose "New version of file not found!"
        return $false
    }

    [cDownloadFile]Get()
    {
        $returnValue = @{
            Url = [System.String]
            OutputFolderPath = [System.String]
            UpdateOnDiff = [System.Boolean]
            SASToken = [System.String]
        }

        return $returnValue
    }
}