Upload an image to PHP with Swift 2.0

Question

I've searched for a long time now and nothing works out for me. I've even tried Alamofire. I'm trying to upload an image in an iOS App (Swift 2.0) to a Wordpress Photo-Contest plugin through PHP. The PHP script is also used for the Wordpress website to upload images.

This is the PHP:

<?php
define('WP_USE_THEMES', false);
require_once("../../../../../wp-load.php");

    $username = $_POST["username"];

    $m = contest_upload_photo('contest-upload-photo', 'contest_upload_photo',username_exists($username ));


function contest_upload_photo($atts, $content = null,$user_ID=null) {

//Important variables 

if ($user_ID == null){
    die(); 
}

$html = '';//Inciate output string
$koncovky = array('jpg', 'jpeg', 'png', 'gif');

$number_images = get_user_meta($user_ID, 'contest_user_images', true);
if(empty($number_images)){$number_images=0;}


$error = array();
// Do some minor form validation to make sure there is content

$name = trim($_POST['photo-name']);
    /*if (empty($_POST['photo-title'])){
    $error['title'] = __('Please enter the photo title','photo-contest');
} else {
    $title = trim($_POST['photo-title']);  
}*/
//Check photo


if ($_FILES['contest-photo']['error'] == UPLOAD_ERR_NO_FILE){
    $error['photo'] = __('Please select the image','photo-contest');
} else {

  //Control upload and extension
  if ($_FILES['contest-photo']['error']) {
    $error['upload_error'] = __('Error image upload.','photo-contest');
  } 
  elseif (!in_array(strtolower(pathinfo($_FILES['contest-photo']['name'], PATHINFO_EXTENSION)), $koncovky)) {
    $error['extension_error'] = __('Image must be jpg, png or gif.','photo-contest');
  } 
  elseif (!($imagesize = getimagesize($_FILES['contest-photo']['tmp_name'])) || $imagesize[2] > 3) {
    $error['type_error'] = __('Image type must be jpg, png or gif.','photo-contest');
  }   
  else {

    @$img=getimagesize($_FILES['contest-photo']['tmp_name']);

    $minimum = array('width' => '400', 'height' => '400');
    $width= $img[0];
    $height =$img[1];
      if ($width < $minimum['width'] ){
        $error['type_error'] = __('Minimum image width is 400px.','photo-contest');
      }
      elseif ($height <  $minimum['height']){
        $error['type_error'] = __('Minimum image height is 400px.','photo-contest');
      }
      $photo_limit = get_option( 'pcplugin-photo-limit', true );
      $size_maxi = $photo_limit;  
      $size = filesize($_FILES['contest-photo']['tmp_name']); 
      if($size>$size_maxi){  
        $error['size_error'] = __('File size is above allowed limitations!','photo-contest');  
}  
    }


}


if(empty($error)){
//If no exist error - create attachment post
  if(empty($_POST['photo-description'])){ 
    $description = sanitize_text_field($_POST['photo-description']);
  }else{
    $description = '';
  }

@$wp_filetype = wp_check_filetype(basename($_FILES['contest-photo']['name']), null );
@$wp_upload_dir = wp_upload_dir();
$attachment = array(
 'guid' => $wp_upload_dir['url'] . '/' . basename( $_FILES['contest-photo']['name'] ), 
 'post_mime_type' => $wp_filetype['type'],
 'post_title' => $name,
 'post_content' => $description,
 'post_status' => 'inherit'
);

require_once(ABSPATH . 'wp-admin/includes/image.php');
require_once(ABSPATH . "wp-admin" . '/includes/file.php');
require_once(ABSPATH . "wp-admin" . '/includes/media.php');
$attach_id = media_handle_upload( 'contest-photo', 0,$attachment );

$attach_data = wp_generate_attachment_metadata( $attach_id, $wp_upload_dir['url'] . '/' . basename( $_FILES['contest-photo']['name']) );

wp_update_attachment_metadata( $attach_id, $attach_data );

update_post_meta($attach_id,'contest-active',1);
update_post_meta($attach_id,'contest-photo-points',0);
update_post_meta($attach_id,'contest-photo-author',$user_ID);
    update_post_meta($attach_id,'post_author',$user_ID);

$number_images = $number_images+1;
update_user_meta($user_ID, 'contest_user_images', $number_images);


    $my_post = array(
  'ID'           => $attach_id,
  'post_author'   => $user_ID,
    );

    wp_update_post( $my_post );


    $image = get_post( $attach_id );

    if ($attach_id==""){
        die("306");
    }else{
        echo($attach_id); 
    }
    if ( ! $image || 'attachment' != $image->post_type || 'image/' != substr( $image->post_mime_type, 0, 6 ) )
        die( json_encode( array( 'error' => sprintf( __( 'Failed resize: %s is an invalid image ID.', 'regenerate-thumbnails' ), esc_html( $attach_id ) ) ) ) );



    $fullsizepath = get_attached_file( $image->ID );

    if ( false === $fullsizepath || ! file_exists( $fullsizepath ) )

    // @set_time_limit( 900 ); // 5 minutes per image should be PLENTY

    $metadata = wp_generate_attachment_metadata( $image->ID, $fullsizepath );

    if ( is_wp_error( $metadata ) )
    if ( empty( $metadata ) )
    wp_update_attachment_metadata( $image->ID, $metadata );
return $attach_id; 


}


}
    ?>

And this is my function in SWIFT:

func send()
{

    let imageData :NSData = UIImageJPEGRepresentation(globalImage, 1.0)!;
    var request: NSMutableURLRequest?
    let HTTPMethod: String = "POST"
    let timeoutInterval: NSTimeInterval = 60
    let HTTPShouldHandleCookies: Bool = false
    let postString = "username=\(globalUsr)"

    request = NSMutableURLRequest(URL: NSURL(string: "***URL TO upload.php***")!)
    request!.HTTPMethod = HTTPMethod
    request!.timeoutInterval = timeoutInterval
    request!.HTTPShouldHandleCookies = HTTPShouldHandleCookies
    request!.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)


    let boundary = "----------SwIfTeRhTtPrEqUeStBoUnDaRy"
    let contentType = "multipart/form-data; boundary=\(boundary)"
    request!.setValue(contentType, forHTTPHeaderField:"Content-Type")
    let body = NSMutableData();


    let tempData = NSMutableData()
    let fileName = "\(globalImage.description).jpg"
    let parameterName = "contest-photo"


    let mimeType = "application/octet-stream"

    tempData.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    let fileNameContentDisposition = "photo-description=\(fileName)"
    let contentDisposition = "Content-Disposition: form-data; contest-photo=\"\(parameterName)\"; \(fileNameContentDisposition)\r\n"
    tempData.appendData(contentDisposition.dataUsingEncoding(NSUTF8StringEncoding)!)
    tempData.appendData("Content-Type: \(mimeType)\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    tempData.appendData(imageData)
    tempData.appendData("\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    body.appendData(tempData)

    body.appendData("\r\n--\(boundary)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    request!.setValue("\(body.length)", forHTTPHeaderField: "Content-Length")
    request!.HTTPBody = body

    do {
        let data = try NSURLConnection.sendSynchronousRequest(request!, returningResponse: nil)
        print("\(data)-Data")
    } catch (let vl_error) {
        print("\(vl_error)-Error")
    }


}

After a lot back and forth, I've messed up the code a lot and also copied some code from other people that I've found just to make it work. I do get "<>-Data" printed out in the console. I would appreciate any help or hint.

Answer 1

After talking in comments, you needed a working example to post your username value to the server. This is a java REST web service:

@POST
@Produces(MediaType.TEXT_PLAIN)
@Path("/swiftCalculator")
public String swiftCalculator(@FormParam("x") int x, @FormParam("y") int y){
    System.out.println("x="+x);
    System.out.println("y="+y);
    return (x + y) + "";
}

And this is how you call it from your swift client:

 func testPost(sender: UIButton) {
        let session = NSURLSession.sharedSession()
        let request = NSMutableURLRequest(URL: NSURL(string: "http://localhost:8080/iOSServer/ios/helloworld/swiftCalculator")!)
        request.HTTPMethod = "POST"
        let d = "4"
        let data = "x=4&y=\(d)"
        request.HTTPBody = data.dataUsingEncoding(NSASCIIStringEncoding)
        let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
            if let error = error {
                print(error)
            }
            if let data = data{
                print("data =\(data)")
            }
            if let response = response {
                print("response = \(response)")
            }
        })
        task.resume()
    }

Please notice that the script expects to have the values in post, so what you were doing is passing the username to the url and then ask your php script to find it in the post variables. that is why you were getting null in you php script.

In this example, i tried to post two variables, which are x and y from my swift client to my REST jersey web service.

Hope this helps

Answer 2

I've adjusted the function in swift which works fine so far now. I only need to know how to upload a file to the php script, I've tried different approaches but it now gives me the error that the Image must be jpg, png or gif. Username, photo name and description get accepted by the script.

func send()  {
    let request = NSMutableURLRequest(URL: NSURL(string: "***URL***")!)
    request.HTTPMethod = "POST"
    let postString = "username=\(globalUsr)&photo-name=\(globalImage.description)&photo-description=\(message.text)"

    let myData : NSData! = postString.dataUsingEncoding(NSUTF8StringEncoding)

    let imageData :NSData = UIImagePNGRepresentation(globalImage, 1.0)!;

    let boundary = "----------SwIfTeRhTtPrEqUeStBoUnDaRy"
    let contentType = "multipart/form-data; boundary=\(boundary)"
    let body = NSMutableData();

    let tempData = NSMutableData()
    let fileName = "\(globalImage.description).jpg"
    let parameterName = "contest-photo"


    let mimeType = "application/octet-stream"

    tempData.appendData(myData)
    tempData.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    let fileNameContentDisposition = "name=\(fileName)"
    let contentDisposition = "Content-Disposition: form-data; name=\"\(fileName)\"; \(imageData)\r\n"
    tempData.appendData(contentDisposition.dataUsingEncoding(NSUTF8StringEncoding)!)
    tempData.appendData("Content-Type: \(mimeType)\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
    tempData.appendData(imageData)
    tempData.appendData("\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)


    body.appendData(tempData)

    body.appendData("\r\n--\(boundary)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)

    request.setValue("\(body.length)", forHTTPHeaderField: "Content-Length")
    request.HTTPBody = body

    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
        data, response, error in

        if error != nil {
            print("error=\(error)")
            return
        }

        let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
        print("responseString = \(responseString!)")
    }
    task.resume()