Swift - AWS S3 Upload Image from Photo Library and download it

Question

I've looked many amazon docs but didn't find enough information to upload and download images to S3 using Swift.
How can I do that?

Answer 1

After doing many research I've got this working,

import AWSS3
import AWSCore

Upload:

I assume you have implemented UIImagePickerControllerDelegate already.

Step 1:

• Create variable for holding url:

  var imageURL = NSURL()
  

• Create upload completion handler obj:

  var uploadCompletionHandler: AWSS3TransferUtilityUploadCompletionHandlerBlock?
  

Step 2: Get Image URL from imagePickerController(_:didFinishPickingMediaWithInfo:):

• Set value of imageURL in this delegate method:

  func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]){
  
      //getting details of image
      let uploadFileURL = info[UIImagePickerControllerReferenceURL] as! NSURL
  
      let imageName = uploadFileURL.lastPathComponent
      let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first! as String
  
      // getting local path
      let localPath = (documentDirectory as NSString).stringByAppendingPathComponent(imageName!)
  
  
      //getting actual image
      let image = info[UIImagePickerControllerOriginalImage] as! UIImage
      let data = UIImagePNGRepresentation(image)
      data!.writeToFile(localPath, atomically: true)
  
      let imageData = NSData(contentsOfFile: localPath)!
      imageURL = NSURL(fileURLWithPath: localPath)
  
      picker.dismissViewControllerAnimated(true, completion: nil)
  }
  

Step 3: Call this uploadImage method after imageURL set to Upload Image to your bucket:

func uploadImage(){

    //defining bucket and upload file name
    let S3BucketName: String = "bucketName"
    let S3UploadKeyName: String = "public/testImage.jpg"


    let expression = AWSS3TransferUtilityUploadExpression()
    expression.uploadProgress = {(task: AWSS3TransferUtilityTask, bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) in
        dispatch_async(dispatch_get_main_queue(), {
            let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)
            print("Progress is: \(progress)")
        })
    }

    self.uploadCompletionHandler = { (task, error) -> Void in
        dispatch_async(dispatch_get_main_queue(), {
            if ((error) != nil){
                print("Failed with error")
                print("Error: \(error!)");
            }
            else{
                print("Sucess")
            }
        })
    }

    let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility()

    transferUtility.uploadFile(imageURL, bucket: S3BucketName, key: S3UploadKeyName, contentType: "image/jpeg", expression: expression, completionHander: uploadCompletionHandler).continueWithBlock { (task) -> AnyObject! in
        if let error = task.error {
            print("Error: \(error.localizedDescription)")
        }
        if let exception = task.exception {
            print("Exception: \(exception.description)")
        }
        if let _ = task.result {
            print("Upload Starting!")
        }

        return nil;
    }
}

Download:

func downloadImage(){

    var completionHandler: AWSS3TransferUtilityDownloadCompletionHandlerBlock?

    let S3BucketName: String = "bucketName"
    let S3DownloadKeyName: String = "public/testImage.jpg"

    let expression = AWSS3TransferUtilityDownloadExpression()
    expression.downloadProgress = {(task: AWSS3TransferUtilityTask, bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) in
        dispatch_async(dispatch_get_main_queue(), {
            let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)
            print("Progress is: \(progress)")
        })
    }

    completionHandler = { (task, location, data, error) -> Void in
        dispatch_async(dispatch_get_main_queue(), {
            if ((error) != nil){
                print("Failed with error")
                print("Error: \(error!)")
            }
            else{
                //Set your image
                var downloadedImage = UIImage(data: data!)
            }
        })
    }

    let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility()

    transferUtility.downloadToURL(nil, bucket: S3BucketName, key: S3DownloadKeyName, expression: expression, completionHander: completionHandler).continueWithBlock { (task) -> AnyObject! in
        if let error = task.error {
            print("Error: \(error.localizedDescription)")
        }
        if let exception = task.exception {
            print("Exception: \(exception.description)")
        }
        if let _ = task.result {
            print("Download Starting!")
        }
        return nil;
    }

}

Ref. for upload image

Ref. for download image

Many thanks to jzorz

Answer 2

If all you want is to download the image, this is a much more concise and correct way to do it:

func downloadImage(bucketName: String, fileName: String, completion: (image: UIImage?, error: NSError?) -> Void) {
    let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility()

    transferUtility.downloadDataFromBucket(bucketName, key: fileName, expression: nil) { (task, url, data, error) in
        var resultImage: UIImage?

        if let data = data {
            resultImage = UIImage(data: data)
        }

        completion(image: resultImage, error: error)
    }
}