<?php
// $Id: encrypt.admin.inc,v 1.1.2.1 2009-08-10 00:21:19 binarybill Exp $

/**
 * @file
 * This file holds the functions for the encrypt Admin settings.
 *
 * @ingroup encrypt
 */

/**
 * Menu callback; displays the encrypt module settings page.
 *
 * @see system_settings_form()
 */
function encrypt_admin_settings() {
  // Initialize to just see if any funny business is going on
  encrypt_initialize();

  // Run requirements (include install file first)
  module_load_include('install', 'encrypt', 'encrypt');
  $requirements = encrypt_requirements('runtime');

  // Get formatted methods
  drupal_add_css(drupal_get_path('module', 'encrypt') . '/encrypt.css');
  $methods = theme('encrypt_admin_list', encrypt_get_methods('full', TRUE));

  // Define Form
  $form['encrypt_default_method'] = array(
    '#type' => 'radios',
    '#title' => t('Default Method'),
    '#description' => t('Define the default encryption method for the site.  Since encryption methods are stored with strings, this can be changed even after you have stored encrypted data.'),
    '#options' => $methods,
    '#default_value' => variable_get('encrypt_default_method', ENCRYPT_DEFAULT_METHOD),
  );

  // Give some help if keys are not found
  if ($requirements['encrypt_keys']['severity'] == REQUIREMENT_ERROR) {
    // Create a default key
    $key = md5(uniqid(mt_rand(0, mt_rand()), TRUE)) . md5(uniqid(mt_rand(0, mt_rand()), TRUE));

    // Create output
    $add_security =  "/**\n";
    $add_security .= " * The following is an array of keys for the Encrypt module.\n";
    $add_security .= " * These are used to encrypt data.  If these are changed after\n";
    $add_security .= " * they have been used to encode data, that data will not be\n";
    $add_security .= " * retrievable.  You can always add new keys, and set a\n";
    $add_security .= " * different default key if needed.\n";
    $add_security .= " */\n";
    $add_security .= '$GLOBALS' . "['encrypt_keys'] = array(\n";
    $add_security .= "  'default' => '" . $key . "',\n";
    $add_security .= ");";

    // Create textarea for help
    $form['encrypt_security_help'] = array(
      '#type' => 'textarea',
      '#title' => t('Secure Keys'),
      '#description' => t('Though, by default the Encrypt module will work, your data will be much more secure if you put the code above into your %settings file.  Once you have done this, you can add new keys and change which key is used by default.  This will not change any existing encoded data.',
        array('%settings' =>  'settings.php')
      ),
      '#default_value' => $add_security,
      '#rows' => 10,
      '#cols' => 100,
      '#resizable' => FALSE,
    );

    // Make it a little more obvious
    drupal_set_message(t('Make your site more secure by putting your keys in %settings.  See The Secure Keys field below.',
      array('%settings' =>  'settings.php')
    ),  'warning');
  }
  else {
    // Get available keys
    $encrypt_keys = $GLOBALS['encrypt_keys'];
    $key_names = array();
    foreach ($encrypt_keys as $name => $key) {
      $key_names[$name] = $name;
    }

    // Allow user to set default key
    $form['encrypt_default_key'] = array(
      '#type' => 'select',
      '#title' => t('Default Key'),
      '#description' => t('This will change what key Encrypt will use as the default key.  This will not affect any existing encoded values.  You can add more keys in your %settings file.',
        array('%settings' =>  'settings.php')
      ),
      '#options' => $key_names,
      '#default_value' => variable_get('encrypt_default_key', ENCRYPT_DEFAULT_KEY),
    );

    // Message user
    drupal_set_message(t('Keys found in %settings file', array('%settings' => 'settings.php')));
  }

  // Make a system setting form and return
  return system_settings_form($form);
}