POST multiple files with multipart/form-data with PowerShell v5 / PowerShell v5 で 複数ファイルを multipart/form-data で POST する

SimpleFilePost.ps1

##################################################################
## POST multiple files with multipart/form-data with PowerShell v5 
##################################################################

## POST Uri
$uri = "https://localhost/"

## Consts
$successFiles = './success'
$tempFile = './tempfile'
$UTF8woBOM = New-Object "System.Text.UTF8Encoding" -ArgumentList @($false)
$boundary = '----BCA246E0-E2CF-48ED-AACE-58B35D68B513'

## Init
Remove-Item $tempFile -Force -ErrorAction Ignore

## Find Files e.g. *.csv
$files = Get-ChildItem * -File -Include *.csv
foreach($file in $files)
{
    Write-Host $file.FullName

    $sw = New-Object System.IO.StreamWriter($tempFile, $true, $UTF8woBOM)
    $fileName = [System.IO.Path]::GetFileName($file.FullName)
    $sw.Write("--$boundary`r`nContent-Disposition: form-data;name=`"files`";filename=`"$fileName`"`r`n`r`n")
    $sw.Close()

    $fs = New-Object System.IO.FileStream($tempFile, [System.IO.FileMode]::Append)
    $bw = New-Object System.IO.BinaryWriter($fs)
    $fileBinary = [System.IO.File]::ReadAllBytes($file.FullName)
    $bw.Write($fileBinary)
    $bw.Close()
}

$sw = New-Object System.IO.StreamWriter($tempFile, $true, $UTF8woBOM)
$sw.Write("`r`n--$boundary--`r`n")
$sw.Close()

## Go POST
try {
    if(($files | Measure-Object).Count -gt 0)
    {
        Invoke-RestMethod -Method POST -Uri $uri -ContentType "multipart/form-data; boundary=$boundary" -InFile $tempFile
    }
} catch {
    Write-Host "StatusCode:" $_.Exception.Response.StatusCode.value__ 
    Write-Host "StatusDescription:" $_.Exception.Response.StatusDescription
    exit 1
}

## Finale
New-Item $successFiles -itemType Directory -Force
Get-ChildItem * -File -Include *.csv | Move-Item -Destination $successFiles -Force
Remove-Item $tempFile -Force

exit 0