Override homepage and removes the "home" link from toolbar (#21)

headless_lightning.info.yml

@@ -8,6 +8,7 @@ distribution:
 dependencies:
   - block
   - headless_ui
+  - json_content
 
 themes:
   - seven

headless_lightning.install

@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * @file
+ * Install and uninstall functions for the JSON Content module.
+ */
+
+/**
+ * Implements hook_install().
+ */
+function headless_lightning_install() {
+  // Don't do anything else during config sync.
+  if (\Drupal::isConfigSyncing()) {
+    return;
+  }
+
+  if (\Drupal::moduleHandler()->moduleExists('json_content')) {
+    \Drupal::configFactory()
+      ->getEditable('system.site')
+      ->set('page.front', '/frontpage')
+      ->save();
+  }
+}

modules/json_content/json_content.info.yml

@@ -0,0 +1,4 @@
+name: 'JSON Content'
+type: module
+core: 8.x
+description: 'Presentation layer blanket for content that is only consumed via an API.'

modules/json_content/json_content.module

@@ -0,0 +1,10 @@
+<?php
+
+/**
+ * Implements hook_toolbar().
+ */
+function json_content_toolbar_alter(array &$items) {
+  // The front page redirects to admin/content and content is generally not
+  // viewed outside of the API so this link makes no sense.
+  unset($items['home']);
+}

modules/json_content/json_content.routing.yml

@@ -0,0 +1,7 @@
+d8contrib.frontpage:
+  path: '/frontpage'
+  defaults:
+    _title: 'Login'
+    _controller: '\Drupal\json_content\Controller\FrontController::frontpage'
+  requirements:
+    _access: 'TRUE'

modules/json_content/src/Controller/FrontController.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Drupal\json_content\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\json_content\Form\UserLoginForm;
+
+class FrontController extends ControllerBase {
+
+  /**
+   * Displays the login form on the homepage and redirects authenticated users.
+   */
+  public function frontpage() {
+    $build = [];
+    if ($this->currentUser()->isAnonymous()) {
+      $build['heading'] = [
+        '#type' => 'markup',
+        '#markup' => $this->t('Please log in for access to the content repository.'),
+      ];
+      $build['form'] = $this->formBuilder()->getForm(UserLoginForm::class);
+    }
+    else {
+      if ($this->currentUser()->hasPermission('access content overview')) {
+        // Permitted users are directed to the admin content page.
+        return $this->redirect('view.content.page_1');
+      }
+      $build['heading'] = [
+        '#type' => 'markup',
+        '#markup' => $this->t('This site has no homepage content.'),
+      ];
+    }
+    return $build;
+  }
+
+}

modules/json_content/src/Form/UserLoginForm.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Drupal\json_content\Form;
+
+use Drupal\user\Form\UserLoginForm as BaseUserLoginForm;
+use Drupal\Core\Form\FormStateInterface;
+
+class UserLoginForm extends BaseUserLoginForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    parent::submitForm($form, $form_state);
+    $form_state->setRedirect('<front>');
+  }
+
+}

modules/json_content/tests/src/Functional/HomepageTest.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Drupal\Tests\headless_ui\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * @group headless
+ * @group json_content
+ */
+class HomepageTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $profile = 'lightning_headless';
+
+  public function test() {
+    $assert = $this->assertSession();
+
+    // Anon users see login form on homepage
+    $this->drupalGet('<front>');
+    $assert->statusCodeEquals(200);
+    $form = $assert->elementExists('css', '#user-login-form');
+    $assert->fieldExists('Username', $form);
+    $assert->fieldExists('Password', $form);
+
+    // Authenticated users without the "access content overview" permission are
+    // not redirected from the homepage.
+    $account = $this->drupalCreateUser();
+    $this->drupalLogin($account);
+    $this->drupalGet('<front>');
+    $assert->pageTextContains('This site has no homepage content');
+    $assert->addressEquals('/');
+
+    // Authenticated users with the "access content overview" permission are
+    // redirected to the /admin/content page.
+    $account = $this->drupalCreateUser(['access content overview']);
+    $this->drupalLogin($account);
+    $this->drupalGet('<front>');
+    $assert->addressEquals('/admin/content');
+
+    // The "Back to site" link does not appear in the toolbar when on an admin
+    // page.
+    $account = $this->drupalCreateUser([], NULL, TRUE);
+    $this->drupalLogin($account);
+    $this->drupalGet('/admin');
+    $assert->elementExists('css', 'nav#toolbar-bar');
+    $assert->linkNotExists('Back to site');
+  }
+
+}