Swift - Downloaded zip file creating .cpgz file after extract. - ios

Question

Downloading a zip file from Dropbox or Google drive URL results in a zip file that is extracted to cpgz file. Using below code to accomplish download of zip file. I want to know is there any specific way to download any zip file so that it does not result in cpgz cycle.
if let zipUrl = URL(string: "https://www.dropbox.com/s/n785nwy2tbaxgz8/app_dfu_package_1.zip?dl=0") {
// create your document folder url
let documentsUrl = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
// your destination file url
let destination = documentsUrl.appendingPathComponent(zipUrl.lastPathComponent)
//print(destination)
var urlRequest = URLRequest.init(url: zipUrl)
urlRequest.httpMethod = "get"
urlRequest.setValue("application/json", forHTTPHeaderField: "content-Type")
// check if it exists before downloading it
if FileManager().fileExists(atPath: destination.path) {
print("The file already exists at path")
} else {
// if the file doesn't exist just download the data from your url
URLSession.shared.downloadTask(with: urlRequest, completionHandler: { (location, response, error) in
// after downloading your data you need to save it to your destination url
guard
let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
let location = location, error == nil
else { return }
do {
try FileManager.default.moveItem(at: location, to: destination)
print("file saved")
} catch {
print(error)
}
}).resume()
}
}
How we can fix it in Swift code

Answer 1

Sharing the link that solved my issue. I was also getting zip file's mime type text/html. Changing the dropbox url solved my query.
How to download a Dropbox share linkage (aimed at a zip file) to local
if let zipUrl = URL(string: "https://www.dropbox.com/s/n785nwy2tbaxgz8/app_dfu_package_1.zip?dl=1") {
// create your document folder url
let documentsUrl = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
// your destination file url
let destination = documentsUrl.appendingPathComponent(zipUrl.lastPathComponent)
//print(destination)
var urlRequest = URLRequest.init(url: zipUrl)
urlRequest.httpMethod = "get"
urlRequest.setValue("application/json", forHTTPHeaderField: "content-Type")
// check if it exists before downloading it
if FileManager().fileExists(atPath: destination.path) {
print("The file already exists at path")
} else {
// if the file doesn't exist just download the data from your url
URLSession.shared.downloadTask(with: urlRequest, completionHandler: { (location, response, error) in
// after downloading your data you need to save it to your destination url
guard
let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
let mimeType = response?.mimeType,
let location = location, error == nil
else { return }
do {
try FileManager.default.moveItem(at: location, to: destination)
print("file saved")
print("Mime Type:- \(mimeType)")
} catch {
print(error.localizedDescription)
}
}).resume()
}
}
After making URL change(dl=0 to dl=1), the mime type I get is application/binary. It solved .zip to .cpgz cycles on the extraction of the zip file.

Answer 2

First make sure that your server is returning a zip file itself or not by adding following code :
let response = response as! HTTPURLResponse
guard (200...299).contains(response.statusCode) else {
… deal with the server-side error …
}
guard response.mimeType == "application/zip" else {
… deal with the bogus `Content-Type` …
}
If its a zip file then it will execute forward and you have to do like follows to save that file in disk:
let destinationDir = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
let destination = destinationDir.appendingPathComponent("SomeFileName.zip")
try data!.write(to: destination)