Lability

0.15.0

Src/Private/Test-ResourceDownload.ps1

                                function Test-ResourceDownload {

<#

    .SYNOPSIS

        Tests if a web resource has been downloaded and whether the MD5 checksum is correct.

    .NOTES

        Based upon https://github.com/iainbrighton/cRemoteFile/blob/master/DSCResources/VE_RemoteFile/VE_RemoteFile.ps1

#>

    [CmdletBinding()]

    [OutputType([System.Boolean])]

    param (

        [Parameter(Mandatory, ValueFromPipeline)]

        [System.String] $DestinationPath,

        [Parameter(Mandatory, ValueFromPipelineByPropertyName)]

        [System.String] $Uri,

        [Parameter(ValueFromPipelineByPropertyName)]

        [AllowNull()]

        [System.String] $Checksum,

        [Parameter(ValueFromPipelineByPropertyName)]

        [System.UInt32] $BufferSize = 64KB,

        ## Enables mocking terminating calls from Pester

        [Parameter(ValueFromPipelineByPropertyName)]

        [System.Management.Automation.SwitchParameter] $ThrowOnError

        ##TODO: Support Headers and UserAgent

    )

    process {

        [ref] $null = $PSBoundParameters.Remove('ThrowOnError');

        $resource = Get-ResourceDownload @PSBoundParameters;

        $isCompliant = $true;

        if (-not (Test-Path -Path $DestinationPath -PathType Leaf)) {

            ## If the actual file doesn't exist return a failure! (#205)

            $isCompliant = $false;

        }

        elseif ([System.String]::IsNullOrEmpty($Checksum)) {

            Write-Verbose -Message ($localized.ResourceChecksumNotSpecified -f $DestinationPath);

            $isCompliant = $true;

        }

        elseif ($Checksum -eq $resource.Checksum) {

            Write-Verbose -Message ($localized.ResourceChecksumMatch -f $DestinationPath, $Checksum);

            $isCompliant = $true;

        }

        else {

            Write-Verbose -Message ($localized.ResourceChecksumMismatch  -f $DestinationPath, $Checksum);

            $isCompliant = $false;

        }

        if ($ThrowOnError -and (-not $isCompliant)) {

            throw ($localized.ResourceChecksumMismatchError -f $DestinationPath, $Checksum);

        }

        else {

            return $isCompliant;

        }

    } #end process

} #end function

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