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<?php

/**

 * @file

 * Rules specific functions that expose content_access' API.

 *

 * @todo

 * A way to enable per-node settings when a rule created, otherwise no effects

 *   will be noticed.

 * Clean-up function names.

 */

/**

 * Implements hook_rules_event_info().

 *

 * @ingroup rules

 */

function content_access_rules_rules_event_info() {

  $events['content_access_content_type'] = array('label' => t('Content type access control was changed'));

  $events['content_access_per_node'] = array('label' => t('Per node access control was changed'));

  if (module_exists('acl')) {

    $events['content_access_user_acl'] = array('label' => t('User was added to ACL'));

  }

  $items = array();

  foreach ($events as $name => $event) {

    $items[$name] = array(

      'label' => $event['label'],

      'group' => t('Content Access'),

    );

  }

  return $items;

}

/**

 * Implementation of hook_rules_action_info().

 *

 * @ingroup rules

 */

function content_access_rules_rules_action_info() {

  $role_actions = array(

    'content_access_action_grant_node_permissions' => array(

      'label' => t('Grant access by role'),

      'description' => t('Grant access to the following content'),

    ),

    'content_access_action_revoke_node_permissions' => array(

      'label' => t('Revoke access by role'),

      'description' => t('Revoke access to the following content'),

    ),

  );

  $reset_actions = array(

    'content_access_action_reset_node_permissions' => array(

      'label' => t('Reset access to content type defaults'),

      'description' => t('Reset node permissions to default permissions'),

    ),

  );

  $user_actions = array(

    'content_access_action_user_grant' => array(

      'label' => t('Grant access by user'),

      'operation' => t('Grant'),

      'description' => t('Grant access to the following content'),

    ),

    'content_access_action_user_revoke' => array(

      'label' => t('Revoke access by user'),

      'operation' => t('Revoke'),

      'description' => t('Revoke access to the following content'),

    ),

  );

  $items = array();

  foreach ($role_actions as $name => $action) {

    $items[$name] = array(

      'label' => $action['label'],

      'parameter' => array(

        'node' => array(

          'type' => 'node',

          'label' => t('Content'),

          'description' => $action['description'],

        ),

        'permissions' => array(

          'type' => 'list<text>',

          'label' => t('Role-based access control settings'),

          'optional' => TRUE,

          'options list' => 'content_access_action_roles_permissions_list',

          'restriction' => 'input',

        ),

      ),

      'group' => t('Content Access'),

      'callbacks' => array(

        'form_alter' => 'content_access_rules_action_form_alter',

      ),

    );

  }

  foreach ($reset_actions as $name => $action) {

    $items[$name] = array(

      'label' => $action['label'],

      'parameter' => array(

        'node' => array(

          'type' => 'node',

          'label' => t('Content'),

          'description' => $action['description'],

        ),

      ),

      'group' => t('Content Access'),

    );

  }

  if (module_exists('acl')) {

    foreach ($user_actions as $name => $action) {

      $items[$name] = array(

        'label' => $action['label'],

        'named parameter' => TRUE,

        'parameter' => array(

          'node' => array(

            'type' => 'node',

            'label' => t('Content'),

            'description' => $action['description'],

          ),

          'content_access_user_view' => array(

            'type' => 'user',

            'label' => t('@action view access', array('@action' => $action['operation'])),

            'optional' => TRUE,

            'description' => t('@action view access to the following user.', array('@action' => $action['operation'])),

          ),

          'content_access_user_update' => array(

            'type' => 'user',

            'label' => t('@action update access', array('@action' => $action['operation'])),

            'optional' => TRUE,

            'description' => t('@action edit access to the following user.', array('@action' => $action['operation'])),

          ),

          'content_access_user_delete' => array(

            'type' => 'user',

            'label' => t('@action delete access', array('@action' => $action['operation'])),

            'optional' => TRUE,

            'description' => t('@action delete access to the following user.', array('@action' => $action['operation'])),

          ),

        ),

        'group' => t('Content Access User'),

      );

    }

  }

  return $items;

}

/**

 * Returns an options list array for the content access permission parameter.

 */

function content_access_action_roles_permissions_list() {

  $options = array();

  $roles = array_map('filter_xss_admin', user_roles());

  foreach (_content_access_get_operations() as $op => $label) {

    foreach ($roles as $rid => $role) {

      $options[$op][$op . ':' . $rid] = $op . ' ' . $role;

    }

  }

  return $options;

}

/**

 * Alter the settings form to render the text<list> as checkboxes.

 */

function content_access_rules_action_form_alter(&$form, &$form_state) {

  // Per node access control should be enabled for this type of action to be

  // effective.

  drupal_set_message(t('Access control settings will not be executed for the affected node unless you enabled \'%per_node\' from the Access Control tab on content type page of the node', array('%per_node' => 'Per content node access control settings')), 'warning');

  // Alter the text<list> to make it into checkboxes groups

  $elements =& $form['parameter']['permissions']['settings']['permissions'];

  $elements = content_access_rules_checkboxes_form((array) $elements['#default_value']);

  // Add our own after build callback for fixing the form value afterwards.

  $elements['#after_build'][] = 'content_access_rules_action_form_after_build';

  // Make sure our include file is loaded when FAPI processes the form.

  form_load_include($form_state, 'inc', 'content_access_rules', 'content_access_rules.rules');

}

/**

 * Form after build callback.

 *

 * Get the form settings as checkboxes, convert them back to list<text>.

 */

function content_access_rules_action_form_after_build($element, &$form_state) {

  if ($form_state['process_input']) {

    $form_value = drupal_array_get_nested_value($form_state['values'], $element['#parents']);

    $value = content_access_rules_transform_to_rule_value($form_value);

    form_set_value($element, $value, $form_state);

  }

  return $element;

}

/**

 * Returns the form elements for configuring content access per-role permissions.

 */

function content_access_rules_checkboxes_form($value) {

  $form = array();

  $roles = array_map('filter_xss_admin', user_roles());

  $defaults = content_access_rules_transform_rules_value($value);

  foreach (_content_access_get_operations() as $op => $label) {

    $form[$op] = array(

      '#type' => 'checkboxes',

      '#prefix' => '<div class="content_access-div">',

      '#suffix' => '</div>',

      '#options' => $roles,

      '#title' => $label,

      '#default_value' => isset($defaults[$op]) ? $defaults[$op] : array(),

      '#process' => array('form_process_checkboxes', 'content_access_disable_checkboxes'),

    );

  }

  $form['clearer'] = array(

    '#value' => '<br clear="all" />',

  );

  drupal_add_css(drupal_get_path('module', 'content_access') . '/content_access.css');

  return $form;

}

/**

 * Transforms the array of text values used by Rules to an array keyed by $op and $rid.

 *

 * @see content_access_rules_transform_to_rule_value()

 */

function content_access_rules_transform_rules_value($value) {

  $array = array();

  foreach ($value as $op_role) {

    $parts = explode(':', $op_role);

    // The first item is $op and the second $rid.

    $array[$parts[0]][] = $parts[1];

  }

  return $array;

}

/**

 * Transform the form values array keyed by $op and $rid to an array of text values as used by Rules.

 *

 * @see content_access_rules_transform_rules_value()

 */

function content_access_rules_transform_to_rule_value($form_values) {

  $value = array();

  foreach ($form_values as $op => $array) {

    foreach (array_filter($array) as $rid => $data) {

      $value[] = $op . ':' . $rid;

    }

  }

  return $value;

}

/**

 * Action implementation: Grant permissions for a node.

 */

function content_access_action_grant_node_permissions($node, $permissions) {

  if (!empty($node->nid) && _content_access_rules_check_setting($node)) {

    // Transform the value to the content-access format.

    $settings = content_access_rules_transform_rules_value($permissions);

    $ca_settings = array();

    foreach (_content_access_get_operations() as $op => $label) {

      // Merge in the array of role-ids for each operation.

      $settings += array($op => array());

      $ca_settings[$op] = array_keys(array_flip(content_access_per_node_setting($op, $node)) + array_flip($settings[$op]));

    }

    content_access_save_per_node_settings($node, $ca_settings);

    content_access_action_aquire_grants($node);

  }

}

/**

 * Action implementation: Revoke permissions for a node.

 */

function content_access_action_revoke_node_permissions($node, $permissions) {

  if (!empty($node->nid) && _content_access_rules_check_setting($node)) {

    // Transform the value to the content-access format.

    $settings = content_access_rules_transform_rules_value($permissions);

    $ca_settings = array();

    foreach (_content_access_get_operations() as $op => $label) {

      $settings += array($op => array());

      $ca_settings[$op] = array_diff(content_access_per_node_setting($op, $node), $settings[$op]);

    }

    content_access_save_per_node_settings($node, $ca_settings);

    content_access_action_aquire_grants($node);

  }

}

/**

 * Action implementation: Reset permissions for a node.

 */

function content_access_action_reset_node_permissions($node) {

  content_access_delete_per_node_settings($node);

  content_access_action_aquire_grants($node);

}

/**

 * Verifies that per content settings are activated for the given node.

 */

function _content_access_rules_check_setting($node) {

  $type = $node->type;

  $settings = variable_get('content_access_' . $type, array());

  if (isset($settings['per_node']) && $settings['per_node']) {

    return TRUE;

  }

  // If we didn't find any settings in content access for this type return

  // false as we don't want to process it.

  rules_log("Can't set per content permissions for content type @type. Make sure to have per content settings activated for content types you want to alter access control for.", array('@type' => $node->type), RulesLog::WARN);

  return FALSE;

}

/**

 * Split the settings string into array.

 */

function content_access_action_settings($action_settings = array()) {

  $roles_ids = array_flip(user_roles());

  foreach (_content_access_get_operations() as $op => $label) {

    $settings[$op] = array();

  }

  foreach ($action_settings as $op_role => $role) {

    $op = substr($op_role, 0, strpos($op_role, ':'));

    $rid = $roles_ids[$role];

    $settings[$op][] = $rid;

  }

  return $settings;

}

/**

 * Action implementation: Grant user access.

 */

function content_access_action_user_grant($params) {

  content_access_action_user($params, 'grant');

}

/**

 * Action implementation: Revoke user access.

 */

function content_access_action_user_revoke($params) {

  content_access_action_user($params, 'revoke');

}

/**

 * Process Rule's param, and grant by the passed operation.

 */

function content_access_action_user($params, $type) {

  $ops = array('view', 'update', 'delete');

  $settings = array();

  $node = $params['node'];

  foreach ($ops as $op) {

    if ($params['content_access_user_' . $op]) {

      $settings[$op] = $params['content_access_user_' . $op]->uid;

    }

  }

  foreach ($settings as $op => $uid) {

    $acl_id = content_access_get_acl_id($node, $op);

    acl_node_add_acl($node->nid, $acl_id, (int) ($op == 'view'), (int) ($op == 'update'), (int) ($op == 'delete'), content_access_get_settings('priority', $node->type));

    db_delete('acl_user')

      ->condition('acl_id', $acl_id)

      ->condition('uid', $uid)

      ->execute();

    if ($type == 'grant') {

      db_insert('acl_user')

        ->fields(array(

          'acl_id' => $acl_id,

          'uid' => $uid,

        ))

        ->execute();

    }

  }

  content_access_action_aquire_grants($node);

}

/**

 * Apply the new grants to the affected node.

 */

function content_access_action_aquire_grants($node) {

  // node_save() does implement node_access_acquire_grants() so we don't want

  // to execute it again or we'll get a duplicated key exception

  if (!isset($node->op) ||

      (isset($node->op) && $node->op != 'Save')) {

    node_access_acquire_grants($node);

  }

}