Swift, php - can't upload image - php

Question

I'm trying to upload an image to my web server from an ios app using PHP. I have the following code that manages the upload:
func uploadImage()
{
// get userId from saved credentials
let userId = UserDefaults.standard.string(forKey: "userId")
let param = ["userId":userId]
let imageData = UIImageJPEGRepresentation(profPicIV.image!, 1)
if(imageData == nil ) { return }
self.imgUploadButton.isEnabled = false
let uploadScriptUrl = URL(string: "http://xxx.xxx.xxx.xxx/scripts/imageUpload.php")
let boundary = generateBoundaryString()
var request = NSMutableURLRequest(url: uploadScriptUrl!)
request.httpMethod = "POST"
request.httpBody = createBodyWithParameters(param as! [String : String], filePathKey: "file", imageDataKey: imageData!, boundary: boundary)
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
if (profPicIV.image == nil)
{
return
}
if(imageData == nil)
{
return
}
let session = URLSession.shared
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard ((data) != nil), let _:URLResponse = response, error == nil else {
print("error")
return
}
if let dataString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
{
print(dataString)
}
})
task.resume()
}
along with the createBodyWithParameters:
func createBodyWithParameters(_ parameters: [String: String]?, filePathKey: String?, imageDataKey: Data, boundary: String) -> Data {
let body = NSMutableData();
if parameters != nil {
for (key, value) in parameters! {
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.appendString("\(value)\r\n")
}
}
let filename = "menu-image.jpg"
let mimetype = "image/jpg"
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
body.appendString("Content-Type: \(mimetype)\r\n\r\n")
body.append(imageDataKey)
body.appendString("\r\n")
body.appendString("--\(boundary)--\r\n")
return body as Data
}
}
//add appendString function
extension NSMutableData {
func appendString(_ string: String) {
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: false)
append(data!)
}
}
My PHP page on my webserver looks like this:
<?php
$user_id = $_POST["userId"];
$target_dir = "../profPics/" . $user_id;
if(!file_exists($target_dir))
{
mkdir($target_dir, 0744, true);
}
$target_dir = $target_dir . "/" . basename($_FILES["file"]["name"]);
if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_dir)) {
echo json_encode([
"message" => "The file ". basename( $_FILES["file"]["name"]). " has been uploaded.",
"status" => "OK",
"userId" => $user_id
]);
} else {
echo json_encode([
"message" => "Sorry, there was an error uploading your picture.",
"status" => "Error",
"userId" => $user_id
]);
}
?>
but then I try to upload an image and it prints out an error in the console saying:
{"message":"Sorry, there was an error uploading your picture.","status":"Error","userId":"6"}
It is correctly grabbing the userId from my saved login info, and is successfully posting it to the PHP page because the PHP page is returning it in the error (userId = 6.) I can't see anything wrong in the apache error.log. Can anyone see where I'm going wrong? Thanks!