[Demo Code of Vapor v4+] Image processing: upload, store download

Ric · August 16, 2023, 10:02pm

I'm a professional Swift coder, Vapor Neophyte.
I'm trying to learn how to upload & download an arbitrary image.
I'm using Vapor v4.77 (Concurrency).
I need complete demo code to piece the parts into a cohesive whole to understand.
Reference, info is greatly appreciated.
Thanks!

0xTim · August 17, 2023, 9:31am

For downloading an image you can use Vapor's stream API

You have a number of options for uploading, but the efficient way is to stream it to a file as that doesn't load the whole thing into memory. There's an example in Vapor:

github.com

vapor/vapor/blob/main/Sources/Development/routes.swift#L191


      
              return Environment
                  .secret(key: "PASSWORD_SECRET", fileIO: req.application.fileio, on: req.eventLoop)
                  .unwrap(or: Abort(.badRequest))
          }
          
          app.on(.POST, "max-256", body: .collect(maxSize: 256)) { req -> HTTPStatus in
              print("in route")
              return .ok
          }
          
          app.on(.POST, "upload", body: .stream) { req -> EventLoopFuture<HTTPStatus> in
              enum BodyStreamWritingToDiskError: Error {
                  case streamFailure(Error)
                  case fileHandleClosedFailure(Error)
                  case multipleFailures([BodyStreamWritingToDiskError])
              }
              
              return req.application.fileio.openFile(
                  path: Bundle.module.url(forResource: "Resources/fileio", withExtension: "txt")?.path ?? "",
                  mode: .write,
                  flags: .allowFileCreation(),

Ric · August 17, 2023, 4:38pm

I have piecemeal code snippets, most are dated (pre-Vapor v4.7).
Most of the tutorials merely cover introductory text like ‘Hello World.’

I want to get an in-depth grasp of working with binaries (images) and forms between Vapor and the UI.

Thanks for the lead.
I’ll study it.

~ Ric.