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   1. drupal6
   2. drupal7

Implementation of hook_access().

Code

modules/blog/blog.module, line 32

<?php
function blog_access($op, $node, $account) {
  switch ($op) {
    case 'create':
      // Anonymous users cannot post even if they have the permission. 
      return user_access('create blog entries', $account) && $account->uid ? TRUE : NULL;
    case 'update':
      return user_access('edit any blog entry', $account) || (user_access('edit own blog entries', $account) && ($node->uid == $account->uid)) ? TRUE : NULL;
    case 'delete':
      return user_access('delete any blog entry', $account) || (user_access('delete own blog entries', $account) && ($node->uid == $account->uid)) ? TRUE : NULL;
  }
}
?>