Front-end Media Example plugin

plugin.php

<?php

/**
 * Plugin Name:       Front-end Media Example
 * Plugin URI:        http://derekspringer.wordpress.com
 * Description:       An example of adding the media loader on the front-end.
 * Version:           0.1
 * Author:            Derek Springer
 * Author URI:        http://derekspringer.wordpress.com
 * License:           GPL-2.0+
 * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt
 * Text Domain:       frontend-media
 * Domain Path:       /languages
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

/**
 * Class wrapper for Front End Media example
 */
class Front_End_Media {

	/**
	 * A simple call to init when constructed
	 */
	function __construct() {
		add_action( 'init', array( $this, 'init' ) );
	}

	function init() {
		load_plugin_textdomain(
			'frontend-media',
			false,
			dirname( plugin_basename( __FILE__ ) ) . '/languages/' );

		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
		add_filter( 'ajax_query_attachments_args', array( $this, 'filter_media' ) );
		add_shortcode( 'frontend-button', array( $this, 'frontend_shortcode' ) );
	}

	/**
	 * Call wp_enqueue_media() to load up all the scripts we need for media uploader
	 */
	function enqueue_scripts() {
		wp_enqueue_media();
		wp_enqueue_script(
			'some-script',
			plugins_url( '/', __FILE__ ) . 'js/frontend.js',
			array( 'jquery' ),
			'2015-05-07'
		);
	}

	/**
	 * This filter insures users only see their own media
	 */
	function filter_media( $query ) {
		// admins get to see everything
		if ( ! current_user_can( 'manage_options' ) )
			$query['author'] = get_current_user_id();

		return $query;
	}

	function frontend_shortcode( $args ) {
		// check if user can upload files
		if ( current_user_can( 'upload_files' ) ) {
			$str = __( 'Select File', 'frontend-media' );
			return '<input id="frontend-button" type="button" value="' . $str . '" class="button" style="position: relative; z-index: 1;"><img id="frontend-image" />';
		}

		return __( 'Please Login To Upload', 'frontend-media' );
	}
}

new Front_End_Media();