Cannot upload zip file with multipart and URLSession Swift - swift

Question

I am experiencing a really strange issue with uploading zip file to s3... Here is my sample code and all details:
private func uploadZipFile(_ photos:URL,_ step:String,_ presignedUrlModel: PresignedUrlModel) {
var uploadingBackgroundTask = UIBackgroundTaskIdentifier(rawValue: 3)
uploadingBackgroundTask = UIApplication.shared.beginBackgroundTask(expirationHandler: {
UIApplication.shared.endBackgroundTask(uploadingBackgroundTask)
uploadingBackgroundTask = .invalid
})
let success: () -> Void = {
DispatchQueue.main.async {
UIApplication.shared.endBackgroundTask(uploadingBackgroundTask)
uploadingBackgroundTask = .invalid
}
}
let failure: (ErrorResponse) -> Void = { error in
DispatchQueue.main.async {
UIApplication.shared.endBackgroundTask(uploadingBackgroundTask)
uploadingBackgroundTask = .invalid
}
}
let boundary = "Boundary-\(UUID().uuidString)"
let uploadingRequest = URL(string: presignedUrlModel.url)!
var request = APIhelper().getMultipartRequestBody(_type: "POST", _url: uploadingRequest, boundary: boundary)
let body = self.formBackgroundPhotoData(presignedUrlModel, step, photos, boundary)
request.httpBody = body
self.session.configuration.shouldUseExtendedBackgroundIdleMode = true
let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
guard let data = data else {
return
}
if let httpResponse = response as? HTTPURLResponse {
if(httpResponse.statusCode==200)
{
success()
}
else if(httpResponse.statusCode>=400 && httpResponse.statusCode<500)
{
//getting 403 errorr
let error = ErrorResponse(message:
self.errorFormatingClass.getLocalizedErrorMessage(identifier: self.errorFormatingClass.ERROR)
,
identifier: self.errorFormatingClass.ERROR)
failure(error)
}
}
}
)
task.resume()
}
I always getting 403 response:AccessDeniedInvalid according to Policy: Policy Condition failed: ["eq", "$Content-Type", "application/zip"]
​
Here is how I form data:
private func formBackgroundPhotoData(_ presignedUrlModel: PresignedUrlModel,_ step: String,_ zip: URL,_ boundary: String) -> Data {
var body = Data()
var key = "key"
var value = presignedUrlModel.key
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.append("\(value)\r\n")
key = "AWSAccessKeyId"
value = presignedUrlModel.AWSAccessKeyId
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.append("\(value)\r\n")
key = "signature"
value = presignedUrlModel.signature
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.append("\(value)\r\n")
key = "policy"
value = presignedUrlModel.policy
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.append("\(value)\r\n")
let filename = zip.lastPathComponent
guard let data = try? Data(contentsOf: zip) else {
#if DEBUG
debugPrint("backgroundupload", "dataisnull")
#endif
return Data()
}
let mimetype = mimeTypeForPath(url: zip)
body.append("--\(boundary)\r\n")
body.append("Content-Disposition: form-data; name=\"file\"; filename=\"\(filename)\"\r\n")
body.append("Content-Type: \(mimetype)\r\n\r\n")
body.append(data)
body.append("\r\n")
body.append("--\(boundary)--\r\n")
return body
}
Here is multipart request:
public func getMultipartRequestBody(_type: String, _url: URL, boundary: String) ->URLRequest
{
var request = URLRequest(url: _url)
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
request.timeoutInterval = 300
request.httpMethod = _type
return request
}
Now, I know this tons of code, and perhaps nobody will take a look... All I am asking: please provide an example for uploading zip or images to AWS S3, without adding S3 framework for uploading files..
Our whole team does not know what to do :(