Issue backdrop#1077: Add a condition for selecting a specific node ID

Fixes backdrop/backdrop-issues#1077

core/modules/layout/includes/layout.layout.inc

@@ -89,6 +89,14 @@ function layout_layout_access_info() {
     'description' => t('Control access by the currently active interface language.'),
     'class' => 'LanguageLayoutAccess',
   );
+  $info['node_id'] = array(
+    'title' => t('Node: ID'),
+    'description' => t('Control access by the current node ID.'),
+    'class' => 'NodeIDAccess',
+    'required contexts' => array(
+      'node' => 'node',
+    ),
+  );
   $info['user_permission'] = array(
     'title' => t('User: Permission'),
     'description' => t('Control access by permission string.'),

core/modules/layout/layout.module

@@ -640,6 +640,7 @@ function layout_autoload_info() {
     'LayoutAccessNegatable' => 'plugins/access/layout_access.inc',
     'LanguageLayoutAccess' => 'plugins/access/language_layout_access.inc',
     'FrontLayoutAccess' => 'plugins/access/front_layout_access.inc',
+    'NodeIDAccess' => 'plugins/access/node_id_access.inc',
     'PathLayoutAccess' => 'plugins/access/path_layout_access.inc',
     'UserRoleLayoutAccess' => 'plugins/access/user_role_layout_access.inc',
     'UserPermissionLayoutAccess' => 'plugins/access/user_permission_layout_access.inc',

core/modules/layout/plugins/access/node_id_access.inc

@@ -0,0 +1,62 @@
+<?php
+/**
+ * @file
+ * Plugin to provide access control based upon node ID.
+ */
+class NodeIDAccess extends LayoutAccessNegatable {
+  /**
+   * Constructor for a Layout access rule.
+   */
+  function __construct($plugin_name, array $data = array()) {
+    parent::__construct($plugin_name, $data);
+    $this->settings += array(
+      'node_id' => NULL,
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  function form(&$form, &$form_state) {
+    parent::form($form, $form_state);
+    $form['node_id'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Node ID is'),
+      '#weight' => 100,
+      '#default_value' => (int) $this->settings['node_id'],
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  function formSubmit($form, &$form_state) {
+    parent::formSubmit($form, $form_state);
+    $this->settings['node_id'] = $form_state['values']['node_id'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  function checkAccess() {
+    $node = $this->contexts['node']->data;
+    if ($this->settings['negate']) {
+      return ($node->nid != $this->settings['node_id']);
+    }
+    else {
+      return ($node->nid == $this->settings['node_id']);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  function summary() {
+    if ($this->settings['negate']) {
+      return t('Node ID is NOT: @node_id', array('@node_id'  => $this->settings['node_id']));
+    }
+    else {
+      return t('Node ID is: @node_id', array('@node_id'  => $this->settings['node_id']));
+    }
+  }
+}