WORDPRESS: Base64 Image to Wordpress Uploads directory

WORDPRESS: Base64 Image to Wordpress Uploads directory

	function tattoo_submit() {

	  if (isset($_POST["addtattoo"])) {

	    $title = "Tattoo : ". $_POST["tatooInput"];

	    $my_post = array(
	      'post_title'    => $title,
	      'post_status'   => 'publish',
	      'post_author'   => 1,
	      'post_type'     =>'tattoo'
	    );

		$upload_dir       = wp_upload_dir();

		// @new
		$upload_path      = str_replace( '/', DIRECTORY_SEPARATOR, $upload_dir['path'] ) . DIRECTORY_SEPARATOR;

		$img = $_POST['imageData'];
		$img = str_replace('data:image/png;base64,', '', $img);
		$img = str_replace(' ', '+', $img);

		$decoded          = base64_decode($img) ;

		$filename         = 'tattoo.png';

		$hashed_filename  = md5( $filename . microtime() ) . '_' . $filename;

		// @new
		$image_upload     = file_put_contents( $upload_path . $hashed_filename, $decoded );

		//HANDLE UPLOADED FILE
		if( !function_exists( 'wp_handle_sideload' ) ) {

		  require_once( ABSPATH . 'wp-admin/includes/file.php' );

		}

		// Without that I'm getting a debug error!?
		if( !function_exists( 'wp_get_current_user' ) ) {

		  require_once( ABSPATH . 'wp-includes/pluggable.php' );

		}

		// @new
		$file             = array();
		$file['error']    = '';
		$file['tmp_name'] = $upload_path . $hashed_filename;
		$file['name']     = $hashed_filename;
		$file['type']     = 'image/png';
		$file['size']     = filesize( $upload_path . $hashed_filename );

		// upload file to server
		// @new use $file instead of $image_upload
		$file_return      = wp_handle_sideload( $file, array( 'test_form' => false ) );

		$filename = $file_return['file'];
		$attachment = array(
		 'post_mime_type' => $file_return['type'],
		 'post_title' => preg_replace('/\.[^.]+$/', '', basename($filename)),
		 'post_content' => '',
		 'post_status' => 'inherit',
		 'guid' => $wp_upload_dir['url'] . '/' . basename($filename)
		 );
		$attach_id = wp_insert_attachment( $attachment, $filename, 289 );
		require_once(ABSPATH . 'wp-admin/includes/image.php');
		$attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
		wp_update_attachment_metadata( $attach_id, $attach_data );
		$jsonReturn = array(
		  'Status'  =>  'Success'
		);
		 
  	    // Insert the post into the database
	    $tattoo_ID = wp_insert_post( $my_post );

	    if ( $tattoo_ID ){
	      add_post_meta($tattoo_ID, 'text', $_POST["tatooInput"] );
	      add_post_meta($tattoo_ID, 'image', $_POST["imageData"] );
	      add_post_meta($tattoo_ID, 'image_ID', $attach_id );
	      exit( wp_redirect( get_permalink($tattoo_ID) ) );

	    }

	  }

	}

Hi - I use html2canvas to create an image from a div on the WP post edit page. I would like to use this script to save the image (generated as base64) as a normal image in the media library. Can you advice how can I do that?

If you are using AJAX dont forget to put wp_die();