This file allows you to configure SharePress once for an entire WordPress MU installation.

sharepress-mu.php

<?php
/**
 * Working with WordPress MU or Multi-Network? Configure the settings below,
 * and then drop this file into wp-content/mu-plugins. These settings can
 * also be configured on a theme-by-theme basis by copying them into each
 * theme's functions.php file. Enjoy! 
 */

@define('SHAREPRESS_MU_LICENSE_KEY',  '');
@define('SHAREPRESS_MU_APP_ID',       '');
@define('SHAREPRESS_MU_APP_SECRET',   '');

///////////////////////////////////////////////////////////////////////////////
// You should not need to edit below this line
///////////////////////////////////////////////////////////////////////////////

@define('SHAREPRESS_MU', true);

class SharePressMu {
  
  private static $plugin;
  static function load() {
    $class = __CLASS__; 
    return ( self::$plugin ? self::$plugin : ( self::$plugin = new $class() ) );
  }

  private function __construct() {
    add_action('init', array($this, 'init'));
  }

  function init() {
    add_filter('pre_option_sharepress_api_key', array($this, 'api_key'));
    add_filter('pre_option_sharepress_app_secret', array($this, 'app_secret')); 
  }

  function api_key($value) {
    return SHAREPRESS_MU_APP_ID;
  }

  function app_secret($value) {
    return SHAREPRESS_MU_APP_SECRET;
  }
  
}

SharePressMu::load();