Upload file to amazon s3 using Alamofire

Question

I'm using Alamofire 4.0 to create a request to upload file directly to S3 Amazon.

I'm using the service from GetCloudApp. After my request Router.shared.prepareForUploadItem from an api "https://my.cl.ly/v3/items I retrieve the json like this

{
  "slug": "1h132K0z2n3G",
  "name": "Image.png",
  "url": "http://f.cl.ly",
  "uploads_remaining": 1,
  "max_upload_size": 26214400,
  "s3": {
    "AWSAccessKeyId": "AKIAJP2C6U543KJIE2GA",
    "key": "items/353u2B053p0H0D1O3w1b/${filename}",
    "policy": "eyJleHBpcmF0aW9uIjoiMjAxNS0xMS0xMlQxMjo0MTozOFoiLCJjb25kaXRpb25zIjpbeyJidWNrZXQiOiJjbG91ZGFwcC5jb3BwZXIuaW8ifSxbInN0YXJ0cy13aXRoIiwiJGtleSIsIml0ZW1zLzM1M3UyQjA1M3AwSDBEMU8zdzFiLyJdLHsic3VjY2Vzc19hY3Rpb25fcmVkaXJlY3QiOiJodHRwOi8vbXkuY2wuZGV2L3YzL2l0ZW1zLzFoMTMySzB6Mm4zRy9zMyJ9LHsiYWNsIjoicHVibGljLXJlYWQifSxbImNvbnRlbnQtbGVuZ3RoLXJhbmdlIiwwLDI2MjE0NDAwXV19",
    "signature": "wqSVl9+fvkvtIzGfakNF+drqN0s=",
    "success_action_redirect": "http://api.cl.ly/v3/items/1h132K0z2n3G/s3",
    "acl": "public-read"
  }
}

I take these key and value as my parameter :

"AWSAccessKeyId": "AKIAJP2C6U543KJIE2GA",
"key": "items/353u2B053p0H0D1O3w1b/${filename}",
"policy": "eyJleHBpcmF0aW9uIjoiMjAxNS0xMS0xMlQxMjo0MTozOFoiLCJjb25kaXRpb25zIjpbeyJidWNrZXQiOiJjbG91ZGFwcC5jb3BwZXIuaW8ifSxbInN0YXJ0cy13aXRoIiwiJGtleSIsIml0ZW1zLzM1M3UyQjA1M3AwSDBEMU8zdzFiLyJdLHsic3VjY2Vzc19hY3Rpb25fcmVkaXJlY3QiOiJodHRwOi8vbXkuY2wuZGV2L3YzL2l0ZW1zLzFoMTMySzB6Mm4zRy9zMyJ9LHsiYWNsIjoicHVibGljLXJlYWQifSxbImNvbnRlbnQtbGVuZ3RoLXJhbmdlIiwwLDI2MjE0NDAwXV19",
"signature": "wqSVl9+fvkvtIzGfakNF+drqN0s=",
"success_action_redirect": "http://api.cl.ly/v3/items/1h132K0z2n3G/s3",
"acl": "public-read"

Then I create the request to upload my file using s3 dictionary like below :

 Alamofire.upload(multipartFormData: { (multipartForm) in

  for (key, value) in parameter {

    let valueData = value.data(using: .utf8, allowLossyConversion: false)

    guard let newData = valueData else{
      return
    }

    multipartForm.append(newData, withName: key)

    print("\(key) - \(value)")
  }

  multipartForm.append(data, withName: "file")

}, to: s3.url, method : .post) { (encodingResult) in

  switch encodingResult {
  case .success(let upload, _, _):
    upload.responseJSON { response in
      debugPrint(response)
    }
  case .failure(let encodingError):
    print(encodingError)
  }
}

Finally I retrieve the response from server like this, I know it all about authentication but I really don't know what's the right way to do that.

status code: 401, headers {
"Cache-Control" = "no-cache";
Connection = "keep-alive";
"Content-Length" = 28;
"Content-Type" = "text/plain; charset=utf-8";
Date = "Sun, 08 Jan 2017 17:37:17 GMT";
Server = "nginx/1.4.6 (Ubuntu)";
Status = "401 Unauthorized";
"Www-Authenticate" = "Digest realm=\"Application\", qop=\"auth\", algorithm=MD5, nonce=\"MTQ4Mzg5NzAzNzpiYmEwN2MzZDljM2RjNDMyMGE1NzI2ODQ5MjhjMWVkNQ==\", opaque=\"9eb56ccb2e8b017ae42bdb4739690863\"";
"X-Request-Id" = 7bd77581bf677aee1b1abba21b3ad097;
"X-Runtime" = "0.004697";
"X-UA-Compatible" = "IE=Edge,chrome=1";

I try many ways but still no luck and can't make it work. I really need help. Thank in advance.

Answer 1

I figured out why this problem is occurred because I need to authenticate my upload request to S3 using CloudApp's Digest authenticate after my request to CloudApp to upload new file.

I will posted my completed code below:

func uploadFileToS3(_ s3: S3, data : Data, fileName : String, mimeType : String) {

let params = s3.s3Parameter

Alamofire.upload(multipartFormData: { (multipartForm) in

  for (key, value) in params{

    multipartForm.append(value.data(using: .utf8)!, withName: key)

  }

  multipartForm.append(data, withName: "file", fileName: fileName, mimeType: mimeType)

}, to: s3.url, method : .post, headers:["Accept":"application/json"]) { (encodingResult) in

  guard let userInfor = UserDefaults.standard.dictionary(forKey: "UserInformation") else {
    return
  }

  switch encodingResult {
  case .success(let upload, _, _):
    upload.authenticate(user: userInfor["email"]! as! String, password: userInfor["password"]! as! String)

    self.progressbar.isHidden = false
    upload.uploadProgress(closure: { (progress) in

      self.progressbar.progress = Float(progress.fractionCompleted)

    })

    upload.responseJSON{ response in

      self.progressbar.isHidden = true

      let result = JSON(response.result.value!)
      let file = CloudFile(fileInformation: result)

      self.files.append(file)

      let indexPath = IndexPath(row: 0, section: 0)

      DispatchQueue.main.async {
          self.filesTableView.insertRows(at: [indexPath], with: .automatic)
      }

    }
  case .failure(let encodingError):
    print(encodingError)
  }
}

}

Noticed upload.authenticate(user: userInfor["email"]! as! String, password: userInfor["password"]! as! String) in encodingResult result completion handle, this is where you need authenticate your upload request. Alamofire will do the rest.

Hope this will help. Thanks