<?php
// $Id: field_permissions.module,v 1.1.2.9 2009/11/14 12:38:20 markuspetrux Exp $

/**
 * @file
 * This is the main script for the Field Permissions module. It merely contains
 * the implementation of hooks invoked by Drupal core and CCK.
 * All common functions are externalized into several scripts that are included
 * on demand to save memory consumption during normal site operation.
 */

/**
 * Implementation of hook_menu().
 */
function field_permissions_menu() {
  module_load_include('inc', 'field_permissions', 'includes/admin');
  return _field_permissions_menu();
}

/**
 * Implementation of hook_theme().
 */
function field_permissions_theme() {
  return array(
    'field_permissions_troubleshooting_form' => array('arguments' => array('form' => NULL), 'file' => 'includes/admin.inc'),
  );
}

/**
 * Implementation of hook_perm().
 */
function field_permissions_perm() {
  module_load_include('inc', 'field_permissions', 'includes/admin');
  return _field_permissions_perm();
}

/**
 * Implementation of hook_field_settings_alter().
 */
function field_permissions_field_settings_alter(&$settings, $op, $field) {
  if ($op == 'form' || $op == 'save') {
    module_load_include('inc', 'field_permissions', 'includes/admin');
    return _field_permissions_field_settings_alter($settings, $op, $field);
  }
}

/**
 * Implementation of hook_field_access().
 *
 * @param $op
 *   The operation to be performed. Possible values:
 *   - 'edit'
 *   - 'view'
 * @param $field
 *   The field on which the operation is to be performed.
 * @param $account
 *   The account to check.
 *   Note that this argument is optional to content_access(), but it is
 *   always passed to hook_field_access(), with current user if not supplied.
 *   This is an argument that was added to CCK in 6.x-2.2 release.
 * @param $node
 *   (optional) The node on which the operation is to be performed.
 *   Note that this argument is optional to content_access(), but it is
 *   always passed to hook_field_access(), with NULL if not supplied.
 *   This is an argument that was added to CCK in 6.x-2.5 release.
 *
 * @return
 *   FALSE if the operation is not allowed.
 *   Note when content_access() is invoked, access is granted unless one
 *   implementation of hook_field_access() explicitly returns FALSE.
 *
 * @see content_access()
 */
function field_permissions_field_access($op, $field, $account, $node) {
  // Ignore the request if permissions have not been enabled for this field.
  $field_permissions = (isset($field['field_permissions']) && is_array($field['field_permissions']) ? array_filter($field['field_permissions']) : array());
  if (empty($field_permissions)) {
    return;
  }

  if ($op == 'view') {
    if (!empty($field_permissions['view']) || !empty($field_permissions['view own'])) {
      module_load_include('inc', 'field_permissions', 'includes/field_access');
      return _field_permissions_field_view_access($field['field_name'], $field_permissions, $account, $node);
    }
  }
  elseif ($op == 'edit') {
    if (!empty($field_permissions['edit']) || !empty($field_permissions['edit own']) || !empty($field_permissions['create'])) {
      module_load_include('inc', 'field_permissions', 'includes/field_access');
      return _field_permissions_field_edit_access($field['field_name'], $field_permissions, $account, $node);
    }
  }
}