Private/Get-MultipartFormData.ps1
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function Get-MultipartFormData { param ( [Parameter(Mandatory)] $FilePath, [Parameter(Mandatory)] [ValidateSet('fine-tune', 'assistants')] $Purpose ) $boundary = [System.Guid]::NewGuid().ToString() $LF = [System.Environment]::NewLine $encoding = [System.Text.Encoding]::UTF8 $stream = [IO.MemoryStream]::new() # Write start boundary $bytes = $encoding.GetBytes("--$boundary$LF") $stream.Write($bytes, 0, $bytes.Length) # Write purpose part $bytes = $encoding.GetBytes("Content-Disposition: form-data; name=`"purpose`"$LF$LF$Purpose$LF") $stream.Write($bytes, 0, $bytes.Length) # Write separator boundary $bytes = $encoding.GetBytes("--$boundary$LF") $stream.Write($bytes, 0, $bytes.Length) $FileName = Split-Path -Leaf $FilePath # Write file part $bytes = $encoding.GetBytes("Content-Disposition: form-data; name=`"file`"; filename=`"$FileName`"$LF") $stream.Write($bytes, 0, $bytes.Length) $bytes = $encoding.GetBytes("Content-Type: application/octet-stream$LF$LF") $stream.Write($bytes, 0, $bytes.Length) $fileBytes = [IO.File]::ReadAllBytes($FilePath) $stream.Write($fileBytes, 0, $fileBytes.Length) $bytes = $encoding.GetBytes($LF) $stream.Write($bytes, 0, $bytes.Length) # Write end boundary $bytes = $encoding.GetBytes("--$boundary--$LF") $stream.Write($bytes, 0, $bytes.Length) # Reset stream position to start $stream.Position = 0 @{ 'Stream' = $stream 'ContentType' = "multipart/form-data; boundary=$boundary" } } |