Private/New-MultipartFormData.ps1
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<#
.SYNOPSIS Creates multipart/form-data Content-Type Header and Body .DESCRIPTION Built primarily to workaround limitations in PAN-OS XML-API with quoted boundary in OUTER Content-Type header. Returns a PSCustomObject with Header and Body properties which can be used as input to Invoke-WebRequest and .NOTES In PowerShell 7+, Invoke-WebRequest -Form, Invoke-RestMethod -Form DO quote the boundary. Not an option. .NET System.Net.Http.MultipartFormDataContent also DOES quote the boundary. Not an option. Needed something else Issue below captures the challenge nicely https://github.com/PowerShell/PowerShell/issues/9241 Some additional content https://www.reddit.com/r/paloaltonetworks/comments/l47a4h/upload_certificate_via_api/ https://stackoverflow.com/questions/25075010/upload-multiple-files-from-powershell-script https://stackoverflow.com/questions/22491129/how-to-send-multipart-form-data-with-powershell-invoke-restmethod .INPUTS None .OUTPUTS PSCustomObject .EXAMPLE PS> $Data = New-MultipartFormData -File "C:\path\to\file.p12" -UnquotedBoundary PS> Invoke-WebRequest -Method Post -Uri 'https://...' -ContentType $Data.Header.ContentType -Body $Data.Body ... #> function New-MultipartFormData { [CmdletBinding()] param( [parameter(Mandatory=$true,Position=0,HelpMessage='File(s) to be rendered')] [System.IO.FileInfo[]] $File, [parameter(HelpMessage='Specified boundary. Optional')] [String] $Boundary, [parameter(HelpMessage='Special processing for unquoted boundary definition')] [Switch] $UnquotedBoundary ) # Propagate -Debug and -Verbose to this module function, https://tinyurl.com/y5dcbb34 if($PSBoundParameters.Debug) { $DebugPreference = 'Continue' } if($PSBoundParameters.Verbose) { $VerbosePreference = 'Continue' } # Announce Write-Debug ($MyInvocation.MyCommand.Name + ':') # Structure of the returned object $MPFData = [PSCustomObject]@{ 'Header' = [PSCustomObject]@{ 'ContentType' = [String]$null }; 'Body' = [String]$null } if($PSBoundParameters.ContainsKey('Boundary')) { $Boundary = $PSBoundParameters.Boundary } else { $Boundary = [System.Guid]::NewGuid().ToString() } Write-Debug ($MyInvocation.MyCommand.Name + ": Using boundary $Boundary") # Newline to be used $LF = "`r`n" # OUTER HTTP Content-Type header (Invoke-WebRequest ContentType parameter, no hyphen) # Implementation Note: PAN-OS XML-API does NOT support a quoted boundary on the OUTER Content-Type where the boundary is first defined # Works: Content-Type: multipart/form-data; boundary=asdf1234 # Fails: Content-Type: multipart/form-data; boundary="asdf1234" if($PSBoundParameters.UnquotedBoundary.IsPresent) { $MPFData.Header.ContentType = "multipart/form-data; boundary=$Boundary" Write-Debug ($MyInvocation.MyCommand.Name + ": Unquoted boundary: $($MPFData.Header.ContentType)") } else { $MPFData.Header.ContentType = "multipart/form-data; boundary=`"$Boundary`"" Write-Debug ($MyInvocation.MyCommand.Name + ": Quoted boundary: $($MPFData.Header.ContentType)") } # Loop through one or more files foreach($FileCur in $PSBoundParameters.File) { if(Test-Path -Path $FileCur.FullName -Type Leaf) { # Body content. In the body, the boundary is always NOT quoted. No special changes for PAN-OS here $MPFData.Body += "--$Boundary$LF" $MPFData.Body += "Content-Disposition: form-data; name=`"file`"; filename=`"$($FileCur.Name)`"$LF" # Determine MIME type for INNER Content-Type $MimeMap = @{ 'cer' = 'application/pkix-cert'; 'pem' = 'application/x-pem-file'; 'p12' = 'application/x-pkcs12'; 'pfx' = 'application/x-pkcs12' } if($MimeMap.ContainsKey($FileCur.Extension.TrimStart('.'))) { $MPFData.Body += 'Content-Type: ' + $MimeMap.$($FileCur.Extension.TrimStart('.')) + "$LF" } else { $MPFData.Body += "Content-Type: application/octet-stream$LF" } # Required blank line between INNER content header and inner content $MPFData.Body += "$LF" # File Content # Read file as byte array $FileCurBin = [System.IO.File]::ReadAllBytes($FileCur.FullName) # Convert to string without changing and add to body $MPFData.Body += $([System.Text.Encoding]::GetEncoding('iso-8859-1')).GetString($FileCurBin) + "$LF" } # end if(Test-Path) else { Write-Error -Message "$($FileCur.FullName) not found" } } # End INNER content boundary with final two dashes "--" after boundary value, unquoted per standard. No special changes for PAN-OS $MPFData.Body += "--$Boundary--$LF" # Return $MPFData, including Header(s) and Body $MPFData } |