Category: AWS SDK

Using the s3transferutility we will upload images from your camera or photo library in swift. View the source on github

In this example We will have 2 buttons – Camera Upload and Picture Upload.

Depending on what is selected as the data source (camera or photo library) it will upload the file accordingly. If you use the camera button you will notice that we will have to create a temp directory when uploading the image, since there is no asset location for it on the device.

You can find more info in the aws sdk

//
//  PictureViewController.swift
// 
//
//  Created by Jose Deras on 12/30/15.
//  Copyright © 2015 Jose Deras. All rights reserved.
//

import UIKit
import AWSMobileAnalytics
import AWSCognito
import AWSS3
import AWSCore
import Photos
import MobileCoreServices




class PictureViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    @IBOutlet weak var progressView: UIProgressView!
    

    @IBOutlet weak var imageView: UIImageView!
    
    @IBAction func openCameraButton(sender: AnyObject) {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) {
            let camImagePicker = UIImagePickerController()
            camImagePicker.delegate = self
            camImagePicker.sourceType = UIImagePickerControllerSourceType.Camera;
            camImagePicker.allowsEditing = false
            self.presentViewController(camImagePicker, animated: true, completion: nil)
        }
    }
    
    
    @IBAction func openPhotoLibrary(sender: AnyObject) {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary) {
            let imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary;
            imagePicker.allowsEditing = true
            self.presentViewController(imagePicker, animated: true, completion: nil)
        }
    }

    
    
   
    
    //handles upload
    var uploadCompletionHandler: AWSS3TransferUtilityUploadCompletionHandlerBlock?
    
    var uploadFileURL: NSURL?
    

    override func viewDidLoad() {
        super.viewDidLoad()
        


        //setting progress bar to 0
        self.progressView.progress = 0.0;
       
     

        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    
    
    //begin upload from photo library

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
      
        //first run if its coming from photo album
        if(picker.sourceType == UIImagePickerControllerSourceType.PhotoLibrary)
        {
            
        //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)!
        let photoURL = NSURL(fileURLWithPath: localPath)
       
        // let imageWithData = UIImage(data: imageData)!
        
        
        //defining bucket and upload file name
        let S3BucketName: String = "bucketNAme"
        let S3UploadKeyName: String = "test_libarayUpload.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)
                self.progressView.progress = progress
                // self.statusLabel.text = "Uploading..."
                NSLog("Progress is: %f",progress)
            })
        }
        
        self.uploadCompletionHandler = { (task, error) -> Void in
            dispatch_async(dispatch_get_main_queue(), {
                if ((error) != nil){
                    NSLog("Failed with error")
                    NSLog("Error: %@",error!);
                    //    self.statusLabel.text = "Failed"
                }
                else if(self.progressView.progress != 1.0) {
                    //    self.statusLabel.text = "Failed"
                    NSLog("Error: Failed - Likely due to invalid region / filename")
                }
                else{
                    //    self.statusLabel.text = "Success"
                    NSLog("Sucess")
                }
            })
        }
        
        let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility()
        
        transferUtility?.uploadFile(photoURL, bucket: S3BucketName, key: S3UploadKeyName, contentType: "image/jpeg", expression: expression, completionHander: uploadCompletionHandler).continueWithBlock { (task) -> AnyObject! in
            if let error = task.error {
                NSLog("Error: %@",error.localizedDescription);
                //  self.statusLabel.text = "Failed"
            }
            if let exception = task.exception {
                NSLog("Exception: %@",exception.description);
                //   self.statusLabel.text = "Failed"
            }
            if let _ = task.result {
                // self.statusLabel.text = "Generating Upload File"
                NSLog("Upload Starting!")
                // Do something with uploadTask.
            }
            
            return nil;
        }
        
            //end if photo library upload
        self.dismissViewControllerAnimated(true, completion: nil);
        
        }
            
            
            //second check if its coming from camera
        else if(picker.sourceType == UIImagePickerControllerSourceType.Camera)
        {
        
          //  var imageToSave: UIImage = info(UIImagePickerControllerOriginalImage) as UIImage
            var imageToSave: UIImage = info[UIImagePickerControllerOriginalImage] as! UIImage
            
            //defining bucket and upload file name
            let S3BucketName: String = "bucketName"
            //setting temp name for upload
            let S3UploadKeyName = "Test2CameraUpload.jpg"
            
            //settings temp location for image
            let imageName = NSURL.fileURLWithPath(NSTemporaryDirectory() + S3UploadKeyName).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)!
            let photoURL = NSURL(fileURLWithPath: localPath)
            

            
            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)
                    self.progressView.progress = progress
                    // self.statusLabel.text = "Uploading..."
                    NSLog("Progress is: %f",progress)
                })
            }
            
            self.uploadCompletionHandler = { (task, error) -> Void in
                dispatch_async(dispatch_get_main_queue(), {
                    if ((error) != nil){
                        NSLog("Failed with error")
                        NSLog("Error: %@",error!);
                        //    self.statusLabel.text = "Failed"
                    }
                    else if(self.progressView.progress != 1.0) {
                        //    self.statusLabel.text = "Failed"
                        NSLog("Error: Failed - Likely due to invalid region / filename")
                    }
                    else{
                        //    self.statusLabel.text = "Success"
                        NSLog("Sucess")
                    }
                })
            }
            
            let transferUtility = AWSS3TransferUtility.defaultS3TransferUtility()
            
            transferUtility?.uploadFile(photoURL, bucket: S3BucketName, key: S3UploadKeyName, contentType: "image/jpeg", expression: expression, completionHander: uploadCompletionHandler).continueWithBlock { (task) -> AnyObject! in
                if let error = task.error {
                    NSLog("Error: %@",error.localizedDescription);
                    //  self.statusLabel.text = "Failed"
                }
                if let exception = task.exception {
                    NSLog("Exception: %@",exception.description);
                    //   self.statusLabel.text = "Failed"
                }
                if let _ = task.result {
                    // self.statusLabel.text = "Generating Upload File"
                    NSLog("Upload Starting!")
                    // Do something with uploadTask.
                }
                
                return nil;
            }
            
            //end if photo library upload
            self.dismissViewControllerAnimated(true, completion: nil);
            
        

        }
       
        else{
            NSLog("Shit fucked up yo")
        }
        
        
    }
  

}

In the example I will be downloading an image from my S3 bucket using S3TransferUtility for iOS in swift. You can find the source here on github

In the example i have 2 outlets:

    @IBOutlet weak var progressView: UIProgressView!
    @IBOutlet weak var imageView: UIImageView!

This function defines what s3 bucket we are using and the file/image we need to download. It then handles the progress view and finally the image view.

func downloadImage(){
        
        var completionHandler: AWSS3TransferUtilityDownloadCompletionHandlerBlock?

        //downloading image
        
        
        let S3BucketName: String = "yourBucketName"
        let S3DownloadKeyName: String = "example-image-1.png"
        

        
        
        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)
                self.progressView.progress = progress
                //   self.statusLabel.text = "Downloading..."
                NSLog("Progress is: %f",progress)
            })
        }
        
        
        
        self.completionHandler = { (task, location, data, error) -> Void in
            dispatch_async(dispatch_get_main_queue(), {
                if ((error) != nil){
                    NSLog("Failed with error")
                    NSLog("Error: %@",error!);
                    //   self.statusLabel.text = "Failed"
                }
                else if(self.progressView.progress != 1.0) {
                    //    self.statusLabel.text = "Failed"
                    NSLog("Error: Failed - Likely due to invalid region / filename")
                }
                else{
                    //    self.statusLabel.text = "Success"
                    self.imageView.image = 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 {
                NSLog("Error: %@",error.localizedDescription);
                //  self.statusLabel.text = "Failed"
            }
            if let exception = task.exception {
                NSLog("Exception: %@",exception.description);
                //  self.statusLabel.text = "Failed"
            }
            if let _ = task.result {
                //    self.statusLabel.text = "Starting Download"
                NSLog("Download Starting!")
                // Do something with uploadTask.
            }
            return nil;
        }
        
    }

To insert/save items in a DynamoDB using swift. (I will be using the example based here, translated to use swift) You can find the source files here: Github

Here is what my table looks like:

You first have to define a Mapping Class. Basically this is where you define what values from the table you need to insert values to:

//class that gets the objects from db
class DDBTableRow :AWSDynamoDBObjectModel ,AWSDynamoDBModeling  {
     
    var ISBN:String?
    var Title:String?
    var Author:String?
     
 
    class func dynamoDBTableName() -> String! {
        return "Books"
    }
 
     
// if we define attribute it must be included when calling it in function testing...
    class func hashKeyAttribute() -> String! {
        return "ISBN"
    }
     
 
 
    class func ignoreAttributes() -> Array<AnyObject>! {
        return nil
    }
     
    //MARK: NSObjectProtocol hack
    //Fixes Does not conform to the NSObjectProtocol error
 
    override func isEqual(object: AnyObject?) -> Bool {
        return super.isEqual(object)
    }
     
    override func `self`() -> Self {
        return self
    }
}

Once you have the class implementation, then you can begin saving values. Here I created a function called insertValues. I created a few textfield outlets to allow user input and also included the static values commented out.

func insertValues(){
        
        //static values 
        //    let newBook = DDBTableRow.self()
        //    newBook.ISBN = "3333"
        //    newBook.Author = "Ray Jay"
        //    newBook.Title = "Less go"
        
        //values from a text field
        let newBook = DDBTableRow.self()      
        newBook.ISBN = self.isbnField.text
        newBook.Title = self.titleField.text
        newBook.Author = self.authorField.text
        
        
        //saving it
        
        let insertValues = AWSDynamoDBObjectMapper.defaultDynamoDBObjectMapper()
        
        insertValues.save(newBook) .continueWithBlock({ (task: AWSTask!) -> AnyObject! in
            if ((task.error) != nil) {
                NSLog("Failed")
                print("Error: \(task.error)")
            }
            if ((task.result) != nil){
                NSLog("Something happened")
            }
            return nil
        })
    }

If you get this error message:

session task failed with error: Error Domain=NSURLErrorDomain Code=-1200 “An SSL error has occurred and a secure connection to the server cannot be made.” UserInfo={_kCFStreamErrorCodeKey=-9824, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, NSUnderlyingError=0x7fbcb38103c0 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 “(null)” UserInfo={_kCFStreamPropertySSLClientCertificateState=0, _kCFNetworkCFStreamSSLErrorOriginalValue=-9824, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9824}}, NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSErrorFailingURLKey=https://dynamodb.us-east-1.amazonaws.com/, NSErrorFailingURLStringKey=https://dynamodb.us-east-1.amazonaws.com/, _kCFStreamErrorDomainKey=3}

Add the following to info.plist:

 <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>

Adding this disables App transport security that was implemented in iOS9. See more info here.

To query items in a DynamoDB using swift.

(I will be using the example based here, translated to use swift). You can find the source files here: Github

Here is what my table looks like in aws:

You first have to define a Mapping Class. Basically this is where you define what values from the table you need to get:

//class that gets the objects from db
class DDBTableRow :AWSDynamoDBObjectModel ,AWSDynamoDBModeling  {
    
    var ISBN:String?
    var Title:String?
    var Author:String?
    

    class func dynamoDBTableName() -> String! {
        return "Books"
    }

    
// if we define attribute it must be included when calling it in function testing...
    class func hashKeyAttribute() -> String! {
        return "ISBN"
    }
    


    class func ignoreAttributes() -> Array<AnyObject>! {
        return nil
    }
    
    //MARK: NSObjectProtocol hack
    //Fixes Does not conform to the NSObjectProtocol error

    override func isEqual(object: AnyObject?) -> Bool {
        return super.isEqual(object)
    }
    
    override func `self`() -> Self {
        return self
    }
}

Once you have the class implementation, then you can begin the querying. Here I created a function called getQuery the returns the values:

    func getQuery(){
        //performing a query
        
        //first create expression
        let queryExpression = AWSDynamoDBQueryExpression()
        
        //second define the index name
        queryExpression.indexName = "Author-index"
        
        //3rd hashes
        queryExpression.hashKeyAttribute = "Author"
        queryExpression.hashKeyValues = ("Jose Deras")
        
        
        //putting it all together
        let dynamoDBObjectMapper2 = AWSDynamoDBObjectMapper.defaultDynamoDBObjectMapper()
        
        
        dynamoDBObjectMapper2.query(DDBTableRow.self, expression: queryExpression) .continueWithExecutor(AWSExecutor.mainThreadExecutor(), withBlock: { (task:AWSTask!) -> AnyObject! in
            if (task.error == nil) {
                if (task.result != nil) {
                    NSLog("Somthing happened")
                    //starting the output of data
                    let tableRow = task.result as! AWSDynamoDBPaginatedOutput
                    for (items) in tableRow.items {
                        print("\(items.ISBN)")
                        print("\(items.Title)")
                        print("\(items.Author)")
                    }
                }
            }
            else {
                print("Error: \(task.error)")
                
            }
            return nil
        })
        
        
    }

If you get this error message:

session task failed with error: Error Domain=NSURLErrorDomain Code=-1200 “An SSL error has occurred and a secure connection to the server cannot be made.” UserInfo={_kCFStreamErrorCodeKey=-9824, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, NSUnderlyingError=0x7fbcb38103c0 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 “(null)” UserInfo={_kCFStreamPropertySSLClientCertificateState=0, _kCFNetworkCFStreamSSLErrorOriginalValue=-9824, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9824}}, NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSErrorFailingURLKey=https://dynamodb.us-east-1.amazonaws.com/, NSErrorFailingURLStringKey=https://dynamodb.us-east-1.amazonaws.com/, _kCFStreamErrorDomainKey=3}

Add the following to info.plist:

 <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>

Adding this disables App transport security that was implemented in iOS9. See more info here.