File upload to AWS S3 with pre-signed URL iOS/Swift 5

AWSS3Uploader.swift

import AWSS3

class AWSS3Uploader {
    
    /// Creates a upload request for uploading the specified file to a presigned remote URL
    ///
    /// - Parameters:
    ///     - fileURL: The URL of the file to upload.
    ///     - remoteURL: The presigned URL
    ///     - completion: The completion handler to call when the upload request is complete.
    
    class func upload(_ fileURL: URL, toPresignedURL remoteURL: URL, completion: @escaping (Result<URL?, Error>) -> Void) {
        var request = URLRequest(url:  remoteURL )
        request.cachePolicy = .reloadIgnoringLocalCacheData
        request.httpMethod = "PUT"
        
        let uploadTask = URLSession.shared.uploadTask(with: request, fromFile: fileURL, completionHandler: { (data, response, error) in
            if let error = error {
                completion(.failure(error))
                return
            }
            guard response != nil, data != nil else {
                completion(.success(nil))
                return
            }
            completion(.success(fileURL))
        })
        uploadTask.resume()
    }

}

// Usage
AWSS3Uploader().upload(fileURL, toPresignedURL: remoteURL) { (result) in
    switch result {
    case .success(let url):
        print("File uploaded: ", url)
    case .failure(let error):
        print("Upload failed: ", error.localizedDescription)
    }
} 

Thanks for the snip!

Created an async wrapper for it:

private func upload(_ fileURL: URL, toPresignedURL remoteURL: URL) async -> Result<URL?, Error> {
  return await withCheckedContinuation { continuation in
    upload(fileURL, toPresignedURL: remoteURL) { (result) in
      switch result {
      case .success(let url):
          print("File uploaded: ", url)
      case .failure(let error):
          print("Upload failed: ", error.localizedDescription)
      }
      continuation.resume(returning: result)
    }
  }
}

Call it:

let result = await upload(localURL, toPresignedURL: signedURL)

How are you generating the presigned url in swift?

Thanks for this, I was tryin got get background iOS uploads to work with Supabase's signed urls, couldn't figure out what was wrong - I think specifying "PUT" did the trick