multipart/form-data on scripting tool

[pedrosydow]

Hello friends,
I need to replicate one information from the request, that is in a part of the multipart/form-data body, on the response. I would like to know how do I refere to specific part of multipart/form-data on the scripting tool.

Below is the request:

POST /api/v1/liter/application HTTP/1.1
accept: application/json
content-type: multipart/form-data; boundary=BoundaryAthenaabcdefghijklmnopqrstuvwxyz
user-agent: Athena
host: testserver.com
content-length: 441
cache-control: no-cache

--BoundaryAthenaabcdefghijklmnopqrstuvwxyz
Content-Disposition: form-data; name="software_options"

5:262144:24
--BoundaryAthenaabcdefghijklmnopqrstuvwxyz
Content-Disposition: form-data; name="info_rtc"

2025-03-13 13:28:58
--BoundaryAthenaabcdefghijklmnopqrstuvwxyz
Content-Disposition: form-data; name="apitoken"

ZDLJD3CSSKF29F0FLFJBL1994082741880DFS03044K3AZJ1135B29C825009344
--BoundaryAthenaabcdefghijklmnopqrstuvwxyz--

I need to get the date "2025-03-13 13:28:58" and put into a global variable to use it in the response.
I would be very grateful if someone could help me.

[NghiaTranUIT]

Sorry @pedrosydow the Scripting doesn't support multipart/form-data, so you can't read each part data. Only the Breakpoint or Compose can modify it.

Currently, the Script treats your multipart body is a UInt8Array, so here is a quick hack:

// convert UInt8Array to String if possible
const body = String.fromCharCode(request.body);

// write a simple regex to extract each part, written by o3mini, please fix the error if needed
const regex = /--BoundaryAthenaabcdefghijklmnopqrstuvwxyz\r?\nContent-Disposition:\s+form-data;\s+name="([^"]+)"\r?\n\r?\n([\s\S]*?)(?=\r?\n--BoundaryAthenaabcdefghijklmnopqrstuvwxyz)/g;

let match;
while ((match = regex.exec(input)) !== null) {

  // at this point, you can get your data
  console.log("Name:", match[1]);
  console.log("Content:", match[2]);

}

---

I will support multipart/data in Scripting, so it's easier to modify in the next release 👍

[mprice-banno]

@NghiaTranUIT Is this supported yet? I didn't see any documentation on how to script the multipart/data in onRequest.

[NghiaTranUIT]

@mprice-banno Sorry, it's not available yet. If you can share, what you'd like to do with the Scripting for multipart/data, I can make it quick

[mprice-banno]

Right now my use case is that I have a request payload with three parts, one part JSON and two jpeg binaries. I need to be able to reference, and modify both the json, and one of the images. So being able to do something like let jsonPart = request.body.part[0] make some changes and then update the payload something like request.body.part[0] = jsonPart This is probably the most common scenario, but for the issue I'm currently testing/investigating I also need the JPEG data in a variable, and then being able to use something piexifjs (if I can figure out how to get it play with Proxyman) to modify the EXIF data. So essentially just a way to reference the parts and update them from a script.

[NghiaTranUIT]

@mprice-banno @pedrosydow here is the Beta build: https://assets.proxyman.com/beta/Proxyman_6.5.0_Scripting_with_Multipart_form_data.dmg

This build allows you to read/add/remove/update a part of multipart/form-data with the Scripting Tool.

You can find the snippet code at https://docs.proxyman.com/scripting/snippet-code#multipart-form-data-1

[mprice-banno]

So far so good! Need to play with it more, but it seems to be working! Thanks @NghiaTranUIT I'll keep poking at it, and let you know if I run into any issues.

Unrelated to these changes, I did get piexifs working with Proxyman, but it failed to work on the images I had, so i went the route of setting up a local Node service that could run exiftool, and then made an http.post() from proxyman out to the node service. Works great!

[NghiaTranUIT]

Nice, glad to know it works 👍