block_region_permissions.module in Block Region Permissions 8

Block region permissions module.

File

block_region_permissions.module

<?php

/**
 * @file
 * Block region permissions module.
 */
use Drupal\Core\Render\Element;
use Drupal\block\Entity\Block;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Access\AccessResult;

/**
 * Implements hook_form_FORM_ID_alter().
 */
function block_region_permissions_form_block_admin_display_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // Get theme name.
  $current_path = \Drupal::service('path.current')
    ->getPath();
  if ($current_path == '/admin/structure/block') {

    // Get default theme.
    $theme_key = \Drupal::config('system.theme')
      ->get('default');
  }
  else {

    // Get theme from path.
    $theme_key = str_replace('/admin/structure/block/list/', '', $current_path);
  }

  // Get block keys for each region.
  // Also get a master list of region select field options.
  $region_block_keys = [];
  $region_options = [];
  $block_elements = Element::children($form['blocks']);
  foreach ($block_elements as $block_key) {

    // Get region name.
    $region_key = '';
    if (substr($block_key, 0, 7) == 'region-') {

      // Region label or message.
      list(, $region_key, ) = explode('-', $block_key);
    }
    elseif ($block = Block::load($block_key)) {

      // Region block.
      $region_key = $block
        ->getRegion();

      // Save master list of options one time.
      if (empty($region_options)) {
        $region_options = $form['blocks'][$block_key]['region-theme']['region']['#options'];
      }
    }

    // Save region names with block keys.
    if (!empty($region_key)) {
      if ($region_key == -1) {
        $region_key = 'disabled';
      }
      $region_block_keys[$region_key][] = $block_key;
    }
  }

  // Remove blocks for regions the user cannot administer.
  foreach ($region_block_keys as $region_key => $block_keys) {
    if ($region_key != 'disabled') {
      if (!\Drupal::currentUser()
        ->hasPermission("administer {$theme_key} {$region_key}")) {

        // Remove block.
        foreach ($block_keys as $block_key) {
          unset($form['blocks'][$block_key]);
        }

        // Update tracking.
        unset($region_block_keys[$region_key]);
      }
    }
  }

  // Remove region select field options for regions the user cannot administer.
  if (!empty($region_block_keys)) {

    // Remove options from master list.
    foreach ($region_options as $region_key => $options) {
      if (!\Drupal::currentUser()
        ->hasPermission("administer {$theme_key} {$region_key}")) {
        unset($region_options[$region_key]);
      }
    }

    // Replace form block options with master list.
    foreach ($region_block_keys as $region_key => $block_keys) {
      foreach ($block_keys as $block_key) {
        if (isset($form['blocks'][$block_key]['region-theme']['region']['#options'])) {
          $form['blocks'][$block_key]['region-theme']['region']['#options'] = $region_options;
        }
      }
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function block_region_permissions_form_block_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // Get theme name.
  $theme_key = $form['theme']['#value'];

  // Remove region select field options for regions the user cannot administer.
  $region_options = $form['region']['#options'];
  foreach ($region_options as $region_key => $options) {
    if (!\Drupal::currentUser()
      ->hasPermission("administer {$theme_key} {$region_key}")) {
      unset($form['region']['#options'][$region_key]);
    }
  }
}

/**
 * Implements hook_block_access().
 */
function block_region_permissions_block_access(Block $block, $operation, AccountInterface $account) {

  // Disallow delete and update permissions if the user cannot administer for
  // the selected region.
  switch ($operation) {
    case 'delete':
    case 'update':
      $theme_key = $block
        ->getTheme();
      $region_key = $block
        ->getRegion();

      // Skip disabled/none.
      if ($region_key != -1) {

        // Negate to hide operation link.
        return AccessResult::forbiddenIf(!\Drupal::currentUser()
          ->hasPermission("administer {$theme_key} {$region_key}"));
      }
  }
}

Functions

Name	Description
block_region_permissions_block_access	Implements hook_block_access().
block_region_permissions_form_block_admin_display_form_alter	Implements hook_form_FORM_ID_alter().
block_region_permissions_form_block_form_alter	Implements hook_form_FORM_ID_alter().