[WIP] OG Access port

og_access/og_access.info.yml

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+name: Organic Groups access control
+description: "Enable access control for private and public groups and group content."
+package: Organic Groups
+
+core: 8.x
+type: module
+
+dependencies:
+  - og
+  - og_ui

og_access/og_access.module

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+<?php
+
+/**
+ * @file
+ * Enable access control for private and public groups and group content.
+ *
+ * @TODO handle visibility change
+ * @TODO set group content visibility default to that of the group
+ * @TODO move grants/access to service
+ */
+
+use Drupal\Core\Config\Entity\ConfigEntityBundleBase;
+use Drupal\Core\Entity\BundleEntityFormBase;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\node\NodeInterface;
+use Drupal\og\Og;
+use Drupal\og_access\OgAccessBundleFormAlter;
+
+/**
+ * The access realm of group member.
+ */
+define('OG_ACCESS_REALM', 'og_access');
+
+/**
+ * Group public access field.
+ */
+define('OG_ACCESS_FIELD', 'group_access');
+
+/**
+ * Group public access field.
+ */
+define('OG_ACCESS_CONTENT_FIELD', 'group_content_access');
+
+/**
+ * Public group/group content access.
+ */
+define('OG_ACCESS_PUBLIC', 0);
+
+/**
+ * Private group/group content access.
+ */
+define('OG_ACCESS_PRIVATE', 1);
+
+/**
+ * Implements hook_node_grants().
+ */
+function og_access_node_grants(AccountInterface $account, $op) {
+  if ($op != 'view') {
+    return [];
+  }
+
+  /** @var \Drupal\og\MembershipManager $membership_manager */
+  $membership_manager = \Drupal::service('og.membership_manager');
+  if ($groups = $membership_manager->getUserGroups($account)) {
+    foreach ($groups as $group_type => $entity_groups) {
+      /** @var \Drupal\core\Entity\EntityInterface $group */
+      foreach ($entity_groups as $group) {
+        $realm = OG_ACCESS_REALM . ':' . $group_type;
+        $grants[$realm][] = $group->id();
+      }
+    }
+  }
+
+  return !empty($grants) ? $grants : [];
+}
+
+/**
+ * Implements hook_node_access_records().
+ */
+function og_access_node_access_records(NodeInterface $node) {
+  if (!$node->isPublished()) {
+    // Node is unpublished, so we don't allow every group member to see it.
+    return [];
+  }
+
+  // The group IDs, that in case access is granted, will be recorded.
+  $gids = [];
+
+  if (Og::isGroup('node', $node->getType()) &&
+      $node->hasField(OG_ACCESS_FIELD) &&
+      !empty($node->{OG_ACCESS_FIELD}) && $node->{OG_ACCESS_FIELD}->value) {
+    // Private group.
+    $gids['node'][] = $node->id();
+  }
+
+  if ($node->hasField(OG_ACCESS_CONTENT_FIELD) &&
+      !empty($node->get(OG_ACCESS_CONTENT_FIELD))) {
+    $content_access = $node->get(OG_ACCESS_CONTENT_FIELD)->value;
+  }
+  else {
+    $content_access = OG_ACCESS_PUBLIC;
+  }
+
+  switch ($content_access) {
+    case OG_ACCESS_PUBLIC:
+      // Skip non-group content nodes.
+      if (!Og::isGroupContent('node', $node->getType())) {
+        break;
+      }
+
+      $has_private = FALSE;
+      /** @var \Drupal\og\OgGroupAudienceHelper $audience_helper */
+      $audience_helper = \Drupal::service('og.group_audience_helper');
+      foreach ($audience_helper->getAllGroupAudienceFields('node', $node->getType()) as $field_name => $field) {
+        foreach ($node->get($field_name)->referencedEntities() as $group) {
+          $list_gids[$group->getEntityTypeId()][] = $group->id();
+
+          if ($has_private) {
+            // We already know we have a private group, so we can avoid
+            // re-checking it.
+            continue;
+          }
+
+          if ($group->hasField(OG_ACCESS_FIELD) && !empty($group->get(OG_ACCESS_FIELD)) &&
+              $group->get(OG_ACCESS_FIELD)->value) {
+            $has_private = TRUE;
+          }
+        }
+      }
+      if ($has_private) {
+        $gids = array_merge_recursive($gids, $list_gids);
+      }
+      break;
+
+    case OG_ACCESS_PRIVATE:
+      $list_gids = [];
+      /** @var \Drupal\og\OgGroupAudienceHelper $audience_helper */
+      $audience_helper = \Drupal::service('og.group_audience_helper');
+      foreach ($audience_helper->getAllGroupAudienceFields('node', $node->getType()) as $field_name => $field) {
+        foreach ($node->get($field_name)->referencedEntities() as $group) {
+          $list_gids[$group->getEntityTypeId()][] = $group->id();
+        }
+      }
+
+      $gids = array_merge_recursive($gids, $list_gids);
+      break;
+  }
+
+  foreach ($gids as $group_type => $values) {
+    foreach ($values as $gid) {
+      $grants[] = [
+        'realm' => OG_ACCESS_REALM . ':' . $group_type,
+        'gid' => $gid,
+        'grant_view' => 1,
+        'grant_update' => 0,
+        'grant_delete' => 0,
+      ];
+    }
+  }
+
+  return !empty($grants) ? $grants : [];
+}
+
+/**
+ * Implements hook_form_alter().
+ */
+function og_access_form_alter(array &$form, FormStateInterface $form_state, $form_id) {
+  if ($form_state->getFormObject() instanceof BundleEntityFormBase) {
+    (new OgAccessBundleFormAlter($form_state->getFormObject()->getEntity()))
+      ->formAlter($form, $form_state);
+  }
+}
+
+/**
+ * Implements hook_entity_insert().
+ */
+function og_access_entity_insert(EntityInterface $entity) {
+  og_access_entity_type_save($entity);
+}
+
+/**
+ * Implements hook_entity_update().
+ */
+function og_access_entity_update(EntityInterface $entity) {
+  og_access_entity_type_save($entity);
+}
+
+/**
+ * Adds/removes the group and group content access fields.
+ *
+ * @param \Drupal\Core\Entity\EntityInterface $entity
+ *   The entity object.
+ */
+function og_access_entity_type_save(EntityInterface $entity) {
+  if (!$entity instanceof ConfigEntityBundleBase || !isset($entity->og_is_group)) {
+    return;
+  }
+
+  $bundle = $entity->id();
+  $definition = \Drupal::entityTypeManager()->getDefinition($entity->getEntityTypeId());
+  $entity_type_id = $definition->getBundleOf();
+
+  $enable_og_access = $entity->og_enable_access;
+
+  // Add/remove on the group itself.
+  $is_group = Og::isGroup($entity_type_id, $bundle);
+  if ($entity->og_is_group || $is_group) {
+    $field = FieldConfig::loadByName($entity_type_id, $bundle, OG_ACCESS_FIELD);
+    if (!$field && $enable_og_access) {
+      Og::createField(OG_ACCESS_FIELD, $entity_type_id, $bundle);
+    }
+    elseif ($field) {
+      if (!$enable_og_access || $is_group && !$entity->og_is_group) {
+        $field->delete();
+      }
+    }
+  }
+
+  // Add remove the relevant field to the group content bundle.
+  $is_group_content = Og::isGroupContent($entity_type_id, $bundle);
+  if ($entity->og_group_content_bundle || $is_group_content) {
+    $field = FieldConfig::loadByName($entity_type_id, $bundle, OG_ACCESS_CONTENT_FIELD);
+
+    if (!$field && $enable_og_access) {
+      Og::createField(OG_ACCESS_CONTENT_FIELD, $entity_type_id, $bundle);
+    }
+    elseif ($field) {
+      if (!$enable_og_access || $is_group_content && !$entity->og_group_content_bundle) {
+        $field->delete();
+      }
+    }
+  }
+}
+
+/**
+ * Implements hook_module_implements_alter().
+ */
+function og_access_module_implements_alter(&$implementations, $hook) {
+  if ($hook == 'form_alter') {
+    // Move our form alter after the og_ui one.
+    // @TODO remove once og_ui and og are merged.
+    $group = $implementations['og_access'];
+    unset($implementations['og_access']);
+    $implementations['og_access'] = $group;
+  }
+}

og_access/src/OgAccessBundleFormAlter.php

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+<?php
+
+namespace Drupal\og_access;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\og\Og;
+
+/**
+ * Helper for og_access_form_alter().
+ */
+class OgAccessBundleFormAlter {
+
+  /**
+   * The entity bundle.
+   *
+   * @var string
+   */
+  protected $bundle;
+
+  /**
+   * The entity type ID.
+   *
+   * @var string
+   */
+  protected $entityTypeId;
+
+  /**
+   * The form entity which has been used for populating form element defaults.
+   *
+   * @var \Drupal\Core\Entity\EntityInterface
+   */
+  protected $entity;
+
+  /**
+   * Construct a BundleFormAlter object.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity object.
+   */
+  public function __construct(EntityInterface $entity) {
+    $this->entity = $entity;
+  }
+
+  /**
+   * This is a helper for og_ui_form_alter().
+   *
+   * @param array $form
+   *   The form variable.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The form state object.
+   */
+  public function formAlter(array &$form, FormStateInterface $form_state) {
+    // Example: node.
+    $this->entityTypeId = $this->entity->getEntityType()->getBundleOf();
+
+    // Example: article.
+    $this->bundle = $this->entity->id();
+
+    $form['og']['og_enable_access'] = [
+      '#type' => 'checkbox',
+      '#title' => t('Restrict access to group members'),
+      '#description' => t('Enable OG access control. Provides a new field that determines the group/group content visibility. Public groups can have member-only content. Any public group content belonging to a private group will be restricted to the members of that group only.'),
+      '#default_value' => $this->bundle ? $this->hasAccessControl() : FALSE,
+      '#states' => [
+        'visible' => [
+          [':input[name="og_is_group"]' => ['checked' => TRUE]],
+          [':input[name="og_group_content_bundle"]' => ['checked' => TRUE]],
+        ],
+      ],
+    ];
+  }
+
+  /**
+   * Checks whether the existing bundle has OG access control enabled.
+   *
+   * @return bool
+   *   True if the group bundle has the OG_ACCESS_FIELD field -OR-
+   *        if the group content bundle has the OG_CONTENT_ACCESS_FIELD field.
+   *   False otherwise.
+   */
+  protected function hasAccessControl() {
+    $field_definitions = \Drupal::service('entity_field.manager')
+      ->getFieldDefinitions($this->entityTypeId, $this->bundle);
+
+    if (Og::isGroup($this->entityTypeId, $this->bundle)) {
+      return isset($field_definitions[OG_ACCESS_FIELD]);
+    }
+
+    if (Og::isGroupContent($this->entityTypeId, $this->bundle)) {
+      return isset($field_definitions[OG_ACCESS_CONTENT_FIELD]);
+    }
+
+    return FALSE;
+  }
+
+}