<?php
// $Id:$


function dojo8_1_install() {
  global $db_type;
  
  switch ($db_type) {
    case 'mysql':
    case 'mysqli':
      db_query('CREATE TABLE {dojo8_1} (nid INT(10) NOT NULL PRIMARY KEY) /*!40100 DEFAULT CHARACTER SET utf8 */');
      db_query('INSERT INTO {dojo8_1} (nid) SELECT nid FROM {node}'); // Prepopulate table with current node nid values
      break;
  }
}



<?php
// $Id:$

/**
 * Implementation of hook_help().
 */
function dojo8_1_help($section) {
  switch ($section) {
    case 'admin/modules#description':
      return t('Module 1 for Dojo lesson 8.');
  }
}

/**
 * Implementation of hook_form_alter().
 */
function dojo8_1_form_alter($form_id, &$form) {

  // Place a checkbox on any node-edit form.
  if (isset($form['#id']) && $form['#id'] == 'node-form') {
    $form['dojo8_1'] = array(
      '#type' => 'checkbox',
      '#title' => t('Enable anonymous user view'),
      '#default_value' => $form['#node']->dojo8_1,
      '#weight' => -100,
    );
  }
}

/**
 * Implementation of hook_nodeapi()
 */
function dojo8_1_nodeapi(&$node, $op, $teaser, $page) {
  global $user;
  
  switch ($op) {
    case 'load':
      $r = db_query('SELECT nid FROM {dojo8_1} WHERE nid = %d', $node->nid);
      return (db_num_rows($r) > 0) ? array('dojo8_1' => TRUE) : array('dojo8_1' => FALSE);
      break;
    case 'submit':
      db_query('DELETE FROM {dojo8_1} WHERE nid = %d', $node->nid);
      if (isset($node->dojo8_1) && $node->dojo8_1 == 1) {
        db_query('INSERT INTO {dojo8_1} SET nid = %d', $node->nid);
      }
      break;
    case 'view':
      if ($page && _apply_access_rules() && !$node->dojo8_1) {
        drupal_access_denied();
        module_invoke_all('exit');
        exit();
      }
      break;
  }
}

/**
 * Implementation of hook_db_rewrite_sql()
 */
function dojo8_1_db_rewrite_sql($query, $primary_table, $primary_field, $args) {
  
  if (!_apply_access_rules()) return array();
  
  switch ($primary_field) {
    case 'nid':
      return array('join' => 'INNER JOIN {dojo8_1} ON dojo8_1.nid = n.nid');
      break;
  }
}


/* helper function */
function _apply_access_rules() {
  global $user;
  return ($user->uid == 0) ? TRUE : FALSE; // Sample rule 1
}