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

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)
}
}

Answer 3

func uploadFile(with resource: String, type: String) {
let key = "\(resource).\(type)"
let localImagePath = Bundle.main.path(forResource: resource, ofType: type)
let localImageUrl = URL(fileURLWithPath: localImagePath!)
let transferManager1 = AWSS3TransferUtility.default()
let expression = AWSS3TransferUtilityUploadExpression()
self.uploadCompletionHandler = { (task, error) -> Void in
DispatchQueue.main.asyncAfter(deadline: .now() + 0.2, execute: {
if ((error) != nil){
print("Failed with error")
print("Error: \(error!)");
}
else{
print("Sucess")
}
})
}
let transferUtility = AWSS3TransferUtility.default()
transferUtility.uploadFile(localImageUrl, bucket: "", key: key, contentType: "video/mov", expression: expression, completionHandler: uploadCompletionHandler).continueWith { (task) -> AnyObject? in
if let error = task.error {
print("Error: \(error.localizedDescription)")
}
if let _ = task.result {
print("Upload Starting!")
}
return nil;
}
}
#IBAction func uplaodVideo(){
uploadFile(with: "random", type: "mov")
}

Answer 4

The above answers were really helpful to me, but they're quite outdated due to a lot of the nomenclature being changed. So I'm providing an updated version of the answer based on the latest Swift frameworks.
Image Picker Controller:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
//getting details of image
let uploadFileURL = info[UIImagePickerController.InfoKey.referenceURL] as! NSURL
let imageName = uploadFileURL.lastPathComponent
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first! as String
// getting local path
let localPath = (documentDirectory as NSString).appendingPathComponent(imageName!)
//getting actual image
let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
let data = image.pngData()
let imageData = image.pngData()! as NSData
let photoURL = NSURL(fileURLWithPath: localPath)
self.uploadFileURL = photoURL
self.uploadImage(inputData: imageData)
do {
let result = try data?.write(to: photoURL as URL, options: .atomic)
} catch let error {
print(error)
}
picker.dismiss(animated: true, completion: nil)
}
Upload Image:
A quick note on upload image. I hashed my filenames. This is not a necessary step, but I highly recommend to do so in the production stage just to ensure no filenames conflict in your S3 bucket.
func uploadImage(inputData: NSData) {
//defining bucket and upload file name
let S3BucketName: String = "your_bucket_name"
let hashed = SHA256.hash(data: inputData)
let S3UploadKeyName: String = hashed.compactMap { String(format: "%02x", $0) }.joined()
let expression = AWSS3TransferUtilityUploadExpression()
expression.progressBlock = {(task: AWSS3TransferUtilityTask, progress: Progress) in
print(progress.fractionCompleted)
}
self.uploadCompletionHandler = { (task, error) -> Void in
DispatchQueue.main.async(execute: {
if ((error) != nil){
print("Failed with error")
print("Error: \(error!)")
}
else{
print("Success")
}
})
}
let transferUtility = AWSS3TransferUtility.default()
transferUtility.uploadFile(self.uploadFileURL! as URL, bucket: S3BucketName, key: S3UploadKeyName, contentType: "image/jpeg", expression: expression, completionHandler: uploadCompletionHandler).continueWith { (task) -> AnyObject? in
if let error = task.error {
print("Error: \(error.localizedDescription)")
}
if let _ = task.result {
print("Upload Starting!")
// Do something with uploadTask.
}
return nil
}
}