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function Verify-Checksum
{
Param (
[string]$File=$(throw("You must specify a filename to get the checksum of.")),
[string]$Expected=$(throw("Checksum required")),
[ValidateSet("sha1","md5")][string]$Algorithm="sha1"
)
$fs = new-object System.IO.FileStream $File, "Open"
$algo = [type]"System.Security.Cryptography.$Algorithm"
$crypto = $algo::Create()
$hash = [BitConverter]::ToString($crypto.ComputeHash($fs)).Replace("-", "")
$fs.Close()
if ($hash -ne $Expected) {
Write-Error "Checksum verification failed, got: '$hash' expected: '$Expected'"
}
}
function Extract-Zip
{
Param (
[string]$Source,
[string]$Destination
)
echo "Extracting '$Source' to '$Destination'..."
New-Item -ItemType Directory -Force -Path $Destination
$shell = new-object -com shell.application
$zipfile = $shell.Namespace($Source)
$destinationFolder = $shell.Namespace($Destination)
$destinationFolder.CopyHere($zipfile.Items(), 16)
}
function BadParam
{
Param ([string]$Description)
throw("You must specify $Description")
}
function Download
{
Param (
[string] $OfficialUrl = $(BadParam("the official download URL")),
[string] $CachedUrl = $(BadParam("the locally cached URL")),
[string] $Destination = $(BadParam("a download target location"))
)
try {
Invoke-WebRequest -UseBasicParsing $CachedUrl -OutFile $Destination
} catch {
Invoke-WebRequest -UseBasicParsing $OfficialUrl -OutFile $Destination
}
}
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