Powershell .NET httpclient add header - powershell

Question

I want to upload a file using powershell to a RestAPI. Sadly the invoke-restmethod does not support MultipartForm Uploads and even with building my own body it does not work. Therefore, I have to get this working using another way :)
Luckily I found this excellent blog post: http://blog.majcica.com/2016/01/13/powershell-tips-and-tricks-multipartform-data-requests/ and now I'm trying to build me a request using the .NET Client within Powershell. But I do hit my borders right now. I need to edit the standard header to add an authorization token. And I have no clue how! Would somebody please so kind and point me in the right direction how to do this? Thank you very much!
function Invoke-MultipartFormDataUpload
{
[CmdletBinding()]
PARAM
(
[string][parameter(Mandatory = $true)][ValidateNotNullOrEmpty()]$InFile,
[string]$ContentType,
[Uri][parameter(Mandatory = $true)][ValidateNotNullOrEmpty()]$Uri,
[System.Management.Automation.PSCredential]$Credential
)
BEGIN
{
if (-not (Test-Path $InFile))
{
$errorMessage = ("File {0} missing or unable to read." -f $InFile)
$exception = New-Object System.Exception $errorMessage
$errorRecord = New-Object System.Management.Automation.ErrorRecord $exception, 'MultipartFormDataUpload', ([System.Management.Automation.ErrorCategory]::InvalidArgument), $InFile
$PSCmdlet.ThrowTerminatingError($errorRecord)
}
if (-not $ContentType)
{
Add-Type -AssemblyName System.Web
$mimeType = [System.Web.MimeMapping]::GetMimeMapping($InFile)
if ($mimeType)
{
$ContentType = $mimeType
}
else
{
$ContentType = "application/octet-stream"
}
}
}
PROCESS
{
Add-Type -AssemblyName System.Net.Http
$httpClientHandler = New-Object System.Net.Http.HttpClientHandler
if ($Credential)
{
$networkCredential = New-Object System.Net.NetworkCredential #($Credential.UserName, $Credential.Password)
$httpClientHandler.Credentials = $networkCredential
}
$httpClient = New-Object System.Net.Http.Httpclient $httpClientHandler
$packageFileStream = New-Object System.IO.FileStream #($InFile, [System.IO.FileMode]::Open)
$contentDispositionHeaderValue = New-Object System.Net.Http.Headers.ContentDispositionHeaderValue "form-data"
$contentDispositionHeaderValue.Name = "fileData"
$contentDispositionHeaderValue.FileName = (Split-Path $InFile -leaf)
$streamContent = New-Object System.Net.Http.StreamContent $packageFileStream
$streamContent.Headers.ContentDisposition = $contentDispositionHeaderValue
$streamContent.Headers.ContentType = New-Object System.Net.Http.Headers.MediaTypeHeaderValue $ContentType
$content = New-Object System.Net.Http.MultipartFormDataContent
$content.Add($streamContent)
try
{
$response = $httpClient.PostAsync($Uri, $content).Result
if (!$response.IsSuccessStatusCode)
{
$responseBody = $response.Content.ReadAsStringAsync().Result
$errorMessage = "Status code {0}. Reason {1}. Server reported the following message: {2}." -f $response.StatusCode, $response.ReasonPhrase, $responseBody
throw [System.Net.Http.HttpRequestException] $errorMessage
}
return $response.Content.ReadAsStringAsync().Result
}
catch [Exception]
{
$PSCmdlet.ThrowTerminatingError($_)
}
finally
{
if($null -ne $httpClient)
{
$httpClient.Dispose()
}
if($null -ne $response)
{
$response.Dispose()
}
}
}
END { }
}

Answer 1

Try this
#Authorization
$httpClient.DefaultRequestHeaders.Authorization = New-Object System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", $accesstoken);