WordPress File Upload

Resulting JSON

"media_details": {
  "width": 4000,
  "height": 2668,
  "file": "2018/11/IMG_2344.jpg",
  "sizes": {
    "thumbnail": {
      "file": "IMG_2344-150x150.jpg",
      "width": 150,
      "height": 150,
      "mime_type": "image/jpeg",
      "source_url": "http://0.0.0.0/wp/wp-content/uploads/2018/11/"
    },
    "medium": {
      "file": "IMG_2344-300x200.jpg",
      "width": 300,
      "height": 200,
      "mime_type": "image/jpeg",
      "source_url": "http://0.0.0.0/wp/wp-content/uploads/2018/11/"
    },
  "medium_large": {
    "file": "IMG_2344-768x512.jpg",
    "width": 768,
    "height": 512,
    "mime_type": "image/jpeg",
    "source_url": "http://0.0.0.0/wp/wp-content/uploads/2018/11/"
  },
  "large": {
    "file": "IMG_2344-1024x683.jpg",
    "width": 1024,
    "height": 683,
    "mime_type": "image/jpeg",
    "source_url": "http://0.0.0.0/wp/wp-content/uploads/2018/11/"
  },
  "full": {
    "file": "11",
    "width": 4000,
    "height": 2668,
    "mime_type": "image/jpeg",
    "source_url": "http://0.0.0.0/wp/wp-content/uploads/2018/11/"
  }
},

WP_Plugin

function handle_image_upload() {
	$errors = [];
	$file = [];

	// Make sure there is a file to handle
	if (isset( $_FILES['files'] )) {

		// Allowed extensions
		$extensions = ['png', 'jpg', 'jpeg', 'gif'];

		// Directorys and urls to upload to
		$wp_upload_dir = wp_upload_dir();
		
		// Gather required variables
		$file_name = wp_unslash($_FILES['files']['name']);
		$filetype = wp_check_filetype( basename( $file_name ), null );
		$tmp_file = wp_unslash($_FILES['files']['tmp_name']);

		// Copy the file from the tmp directory to the uploads directory.
		$unique_file_name = wp_unique_filename( $wp_upload_dir['path'], basename( $file_name ) );
		$new_file = $wp_upload_dir['path'] . '/' . $file_name;
		// if (false === @copy( $tmp_file, $new_file )) {
		// 	error_log("Failed to copy " . $new_file);
		// 	return new WP_Error('upload_error', sprintf( __( 'The selected file could not be copied to %s.', 'add-from-server' ), $wp_upload_dir['path'] ));
		// }

		// ensure valid file type
		for ($i=0; $i < count($extensions); $i++) { 
			if (false === strpos($filetype['type'], $extensions[$i])) {
				return new WP_Error('upload_error', sprintf( __( 'The selected file could not be copied to %s because it is not an allowed file type.', 'add-from-server' ), $wp_upload_dir['path'] ));
			}
		}
		
		// Move the file from the temporary directory to the target upload path.
		$target_path = $wp_upload_dir['path']. "/" . $unique_file_name;
		// $moved_file = move_uploaded_file( $tmp_file, $target_path );
		if (false === move_uploaded_file( $tmp_file, $target_path )) {
			error_log("Failed to copy " . $new_file);
			return new WP_Error('upload_error', sprintf( __( 'The selected file could not be copied to %s.', 'add-from-server' ), $wp_upload_dir['path'] ));
		}

		// Compute the URL
		$url = $wp_upload_dir['url'] . '/' . $file_name;
		
		// Prepare an array of post data for the attachment.
		$attachment = array(
				'guid'           => $url,
				'post_mime_type' => $filetype['type'],
				'post_title'     => sanitize_file_name($file_name),
				'post_content'   => '',
				'post_status'    => 'inherit',
				'post_author'		 => 1,
		);
		
		// Insert the attachment.
		$attach_id = wp_insert_attachment( $attachment );
		
		// Make sure that this file is included, as wp_generate_attachment_metadata() depends on it.
		require_once( ABSPATH . 'wp-admin/includes/image.php' );
		
		// Generate the metadata for the attachment, and update the database record.
		$attach_data = wp_generate_attachment_metadata( $attach_id, $target_path );
		wp_update_attachment_metadata( $attach_id, $attach_data );
		$file['id'] = $attach_id;

	}
	return $file;