Download a previously uploaded file by its ID

WDePOS-FileManager-GetAndDownloadFile.swift

let sdk: WDePOS = WDePOS.sharedInstance()
        
//Example for getting a zip of receipt images previously uploaded
sdk.fileManager.files("merchantId", category: "receiptImages") { (files, error) in
    if error != nil || files == nil {
        //Unknown error when loading receipt images - \(error?.localizedDescription ?? "")")
        return
    }

    guard let files = files, let file = files.first, let fileId = file.internalId, let fileName = file.originalFileName else {
        //"Error when loading receipt images - No files in category
        return
    }

    guard files.count == 1 else {
        //"Error when loading receipt images - More than one archive found
        return
    }

    guard file.originalFileName?.caseInsensitiveCompare("receiptImages.zip") == .orderedSame else {
        //"Error when loading receipt images - Invalid archive name
        return
    }

    //Once we have a valid fileId we can download the file itself
    sdk.fileManager.downloadFile(fileId, completion: { (fileDownload, error) in
        guard let filePath = fileDownload?.filePath, error == nil else {
            //Unknown error when downloading receipt images - \(error?.localizedDescription ?? "")
            completion(.failure(.unknownError(error)))
            return
        }
        guard let urlPath = URL(string: filePath) else {
            //"Unknown error when downloading receipt images - Invalid file path
            completion(.failure(.unknownError(nil)))
            return
        }
        completion(.success(urlPath))
    })
}