Move all files to 2017/

2017/web/core/modules/path/src/Controller/PathController.php

@@ -0,0 +1,134 @@
+<?php
+
+namespace Drupal\path\Controller;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Path\AliasStorageInterface;
+use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Controller routines for path routes.
+ */
+class PathController extends ControllerBase {
+
+  /**
+   * The path alias storage.
+   *
+   * @var \Drupal\Core\Path\AliasStorageInterface
+   */
+  protected $aliasStorage;
+
+  /**
+   * The path alias manager.
+   *
+   * @var \Drupal\Core\Path\AliasManagerInterface
+   */
+  protected $aliasManager;
+
+  /**
+   * Constructs a new PathController.
+   *
+   * @param \Drupal\Core\Path\AliasStorageInterface $alias_storage
+   *   The path alias storage.
+   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   *   The path alias manager.
+   */
+  public function __construct(AliasStorageInterface $alias_storage, AliasManagerInterface $alias_manager) {
+    $this->aliasStorage = $alias_storage;
+    $this->aliasManager = $alias_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('path.alias_storage'),
+      $container->get('path.alias_manager')
+    );
+  }
+
+  /**
+   * Displays the path administration overview page.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request object.
+   *
+   * @return array
+   *   A render array as expected by
+   *   \Drupal\Core\Render\RendererInterface::render().
+   */
+  public function adminOverview(Request $request) {
+    $keys = $request->query->get('search');
+    // Add the filter form above the overview table.
+    $build['path_admin_filter_form'] = $this->formBuilder()->getForm('Drupal\path\Form\PathFilterForm', $keys);
+    // Enable language column if language.module is enabled or if we have any
+    // alias with a language.
+    $multilanguage = ($this->moduleHandler()->moduleExists('language') || $this->aliasStorage->languageAliasExists());
+
+    $header = [];
+    $header[] = ['data' => $this->t('Alias'), 'field' => 'alias', 'sort' => 'asc'];
+    $header[] = ['data' => $this->t('System'), 'field' => 'source'];
+    if ($multilanguage) {
+      $header[] = ['data' => $this->t('Language'), 'field' => 'langcode'];
+    }
+    $header[] = $this->t('Operations');
+
+    $rows = [];
+    $destination = $this->getDestinationArray();
+    foreach ($this->aliasStorage->getAliasesForAdminListing($header, $keys) as $data) {
+      $row = [];
+      // @todo Should Path module store leading slashes? See
+      //   https://www.drupal.org/node/2430593.
+      $row['data']['alias'] = $this->l(Unicode::truncate($data->alias, 50, FALSE, TRUE), Url::fromUserInput($data->source, [
+        'attributes' => ['title' => $data->alias],
+      ]));
+      $row['data']['source'] = $this->l(Unicode::truncate($data->source, 50, FALSE, TRUE), Url::fromUserInput($data->source, [
+        'alias' => TRUE,
+        'attributes' => ['title' => $data->source],
+      ]));
+      if ($multilanguage) {
+        $row['data']['language_name'] = $this->languageManager()->getLanguageName($data->langcode);
+      }
+
+      $operations = [];
+      $operations['edit'] = [
+        'title' => $this->t('Edit'),
+        'url' => Url::fromRoute('path.admin_edit', ['pid' => $data->pid], ['query' => $destination]),
+      ];
+      $operations['delete'] = [
+        'title' => $this->t('Delete'),
+        'url' => Url::fromRoute('path.delete', ['pid' => $data->pid], ['query' => $destination]),
+      ];
+      $row['data']['operations'] = [
+        'data' => [
+          '#type' => 'operations',
+          '#links' => $operations,
+        ],
+      ];
+
+      // If the system path maps to a different URL alias, highlight this table
+      // row to let the user know of old aliases.
+      if ($data->alias != $this->aliasManager->getAliasByPath($data->source, $data->langcode)) {
+        $row['class'] = ['warning'];
+      }
+
+      $rows[] = $row;
+    }
+
+    $build['path_table'] = [
+      '#type' => 'table',
+      '#header' => $header,
+      '#rows' => $rows,
+      '#empty' => $this->t('No URL aliases available. <a href=":link">Add URL alias</a>.', [':link' => $this->url('path.admin_add')]),
+    ];
+    $build['path_pager'] = ['#type' => 'pager'];
+
+    return $build;
+  }
+
+}

2017/web/core/modules/path/src/Form/AddForm.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Drupal\path\Form;
+
+use Drupal\Core\Language\LanguageInterface;
+
+/**
+ * Provides the path add form.
+ *
+ * @internal
+ */
+class AddForm extends PathFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'path_admin_add';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function buildPath($pid) {
+    return [
+      'source' => '',
+      'alias' => '',
+      'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+      'pid' => NULL,
+    ];
+  }
+
+}

2017/web/core/modules/path/src/Form/DeleteForm.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace Drupal\path\Form;
+
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Path\AliasStorageInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Builds the form to delete a path alias.
+ *
+ * @internal
+ */
+class DeleteForm extends ConfirmFormBase {
+
+  /**
+   * The alias storage service.
+   *
+   * @var \Drupal\Core\Path\AliasStorageInterface
+   */
+  protected $aliasStorage;
+
+  /**
+   * The path alias being deleted.
+   *
+   * @var array
+   */
+  protected $pathAlias;
+
+  /**
+   * Constructs a \Drupal\path\Form\DeleteForm object.
+   *
+   * @param \Drupal\Core\Path\AliasStorageInterface $alias_storage
+   *   The alias storage service.
+   */
+  public function __construct(AliasStorageInterface $alias_storage) {
+    $this->aliasStorage = $alias_storage;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('path.alias_storage')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'path_alias_delete';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to delete path alias %title?', ['%title' => $this->pathAlias['alias']]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('path.admin_overview');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $pid = NULL) {
+    $this->pathAlias = $this->aliasStorage->load(['pid' => $pid]);
+
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->aliasStorage->delete(['pid' => $this->pathAlias['pid']]);
+
+    $form_state->setRedirect('path.admin_overview');
+  }
+
+}

2017/web/core/modules/path/src/Form/EditForm.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\path\Form;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Provides the path edit form.
+ *
+ * @internal
+ */
+class EditForm extends PathFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'path_admin_edit';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function buildPath($pid) {
+    return $this->aliasStorage->load(['pid' => $pid]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $pid = NULL) {
+    $form = parent::buildForm($form, $form_state, $pid);
+
+    $form['#title'] = $this->path['alias'];
+    $form['pid'] = [
+      '#type' => 'hidden',
+      '#value' => $this->path['pid'],
+    ];
+
+    $url = new Url('path.delete', [
+      'pid' => $this->path['pid'],
+    ]);
+
+    if ($this->getRequest()->query->has('destination')) {
+      $url->setOption('query', $this->getDestinationArray());
+    }
+
+    $form['actions']['delete'] = [
+      '#type' => 'link',
+      '#title' => $this->t('Delete'),
+      '#url' => $url,
+      '#attributes' => [
+        'class' => ['button', 'button--danger'],
+      ],
+    ];
+
+    return $form;
+  }
+
+}

2017/web/core/modules/path/src/Form/PathFilterForm.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\path\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides the path admin overview filter form.
+ *
+ * @internal
+ */
+class PathFilterForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'path_admin_filter_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $keys = NULL) {
+    $form['#attributes'] = ['class' => ['search-form']];
+    $form['basic'] = [
+      '#type' => 'details',
+      '#title' => $this->t('Filter aliases'),
+      '#open' => TRUE,
+      '#attributes' => ['class' => ['container-inline']],
+    ];
+    $form['basic']['filter'] = [
+      '#type' => 'search',
+      '#title' => $this->t('Path alias'),
+      '#title_display' => 'invisible',
+      '#default_value' => $keys,
+      '#maxlength' => 128,
+      '#size' => 25,
+    ];
+    $form['basic']['submit'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Filter'),
+    ];
+    if ($keys) {
+      $form['basic']['reset'] = [
+        '#type' => 'submit',
+        '#value' => $this->t('Reset'),
+        '#submit' => ['::resetForm'],
+      ];
+    }
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $form_state->setRedirect('path.admin_overview_filter', [], [
+      'query' => ['search' => trim($form_state->getValue('filter'))],
+    ]);
+  }
+
+  /**
+   * Resets the filter selections.
+   */
+  public function resetForm(array &$form, FormStateInterface $form_state) {
+    $form_state->setRedirect('path.admin_overview');
+  }
+
+}

2017/web/core/modules/path/src/Form/PathFormBase.php

@@ -0,0 +1,219 @@
+<?php
+
+namespace Drupal\path\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\Core\Path\AliasStorageInterface;
+use Drupal\Core\Path\PathValidatorInterface;
+use Drupal\Core\Routing\RequestContext;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a base class for path add/edit forms.
+ */
+abstract class PathFormBase extends FormBase {
+
+  /**
+   * An array containing the path ID, source, alias, and language code.
+   *
+   * @var array
+   */
+  protected $path;
+
+  /**
+   * The path alias storage.
+   *
+   * @var \Drupal\Core\Path\AliasStorageInterface
+   */
+  protected $aliasStorage;
+
+  /**
+   * The path alias manager.
+   *
+   * @var \Drupal\Core\Path\AliasManagerInterface
+   */
+  protected $aliasManager;
+
+  /**
+   * The path validator.
+   *
+   * @var \Drupal\Core\Path\PathValidatorInterface
+   */
+  protected $pathValidator;
+
+  /**
+   * The request context.
+   *
+   * @var \Drupal\Core\Routing\RequestContext
+   */
+  protected $requestContext;
+
+  /**
+   * Constructs a new PathController.
+   *
+   * @param \Drupal\Core\Path\AliasStorageInterface $alias_storage
+   *   The path alias storage.
+   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   *   The path alias manager.
+   * @param \Drupal\Core\Path\PathValidatorInterface $path_validator
+   *   The path validator.
+   * @param \Drupal\Core\Routing\RequestContext $request_context
+   *   The request context.
+   */
+  public function __construct(AliasStorageInterface $alias_storage, AliasManagerInterface $alias_manager, PathValidatorInterface $path_validator, RequestContext $request_context) {
+    $this->aliasStorage = $alias_storage;
+    $this->aliasManager = $alias_manager;
+    $this->pathValidator = $path_validator;
+    $this->requestContext = $request_context;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('path.alias_storage'),
+      $container->get('path.alias_manager'),
+      $container->get('path.validator'),
+      $container->get('router.request_context')
+    );
+  }
+
+  /**
+   * Builds the path used by the form.
+   *
+   * @param int|null $pid
+   *   Either the unique path ID, or NULL if a new one is being created.
+   */
+  abstract protected function buildPath($pid);
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $pid = NULL) {
+    $this->path = $this->buildPath($pid);
+    $form['source'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Existing system path'),
+      '#default_value' => $this->path['source'],
+      '#maxlength' => 255,
+      '#size' => 45,
+      '#description' => $this->t('Specify the existing path you wish to alias. For example: /node/28, /forum/1, /taxonomy/term/1.'),
+      '#field_prefix' => $this->requestContext->getCompleteBaseUrl(),
+      '#required' => TRUE,
+    ];
+    $form['alias'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Path alias'),
+      '#default_value' => $this->path['alias'],
+      '#maxlength' => 255,
+      '#size' => 45,
+      '#description' => $this->t('Specify an alternative path by which this data can be accessed. For example, type "/about" when writing an about page.'),
+      '#field_prefix' => $this->requestContext->getCompleteBaseUrl(),
+      '#required' => TRUE,
+    ];
+
+    // A hidden value unless language.module is enabled.
+    if (\Drupal::moduleHandler()->moduleExists('language')) {
+      $languages = \Drupal::languageManager()->getLanguages();
+      $language_options = [];
+      foreach ($languages as $langcode => $language) {
+        $language_options[$langcode] = $language->getName();
+      }
+
+      $form['langcode'] = [
+        '#type' => 'select',
+        '#title' => $this->t('Language'),
+        '#options' => $language_options,
+        '#empty_value' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+        '#empty_option' => $this->t('- None -'),
+        '#default_value' => $this->path['langcode'],
+        '#weight' => -10,
+        '#description' => $this->t('A path alias set for a specific language will always be used when displaying this page in that language, and takes precedence over path aliases set as <em>- None -</em>.'),
+      ];
+    }
+    else {
+      $form['langcode'] = [
+        '#type' => 'value',
+        '#value' => $this->path['langcode'],
+      ];
+    }
+
+    $form['actions'] = ['#type' => 'actions'];
+    $form['actions']['submit'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Save'),
+      '#button_type' => 'primary',
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    $source = &$form_state->getValue('source');
+    $source = $this->aliasManager->getPathByAlias($source);
+    $alias = &$form_state->getValue('alias');
+
+    // Trim the submitted value of whitespace and slashes. Ensure to not trim
+    // the slash on the left side.
+    $alias = rtrim(trim(trim($alias), ''), "\\/");
+
+    if ($source[0] !== '/') {
+      $form_state->setErrorByName('source', 'The source path has to start with a slash.');
+    }
+    if ($alias[0] !== '/') {
+      $form_state->setErrorByName('alias', 'The alias path has to start with a slash.');
+    }
+
+    // Language is only set if language.module is enabled, otherwise save for all
+    // languages.
+    $langcode = $form_state->getValue('langcode', LanguageInterface::LANGCODE_NOT_SPECIFIED);
+
+    if ($this->aliasStorage->aliasExists($alias, $langcode, $this->path['source'])) {
+      $stored_alias = $this->aliasStorage->load(['alias' => $alias, 'langcode' => $langcode]);
+      if ($stored_alias['alias'] !== $alias) {
+        // The alias already exists with different capitalization as the default
+        // implementation of AliasStorageInterface::aliasExists is
+        // case-insensitive.
+        $form_state->setErrorByName('alias', t('The alias %alias could not be added because it is already in use in this language with different capitalization: %stored_alias.', [
+          '%alias' => $alias,
+          '%stored_alias' => $stored_alias['alias'],
+        ]));
+      }
+      else {
+        $form_state->setErrorByName('alias', t('The alias %alias is already in use in this language.', ['%alias' => $alias]));
+      }
+    }
+
+    if (!$this->pathValidator->isValid(trim($source, '/'))) {
+      $form_state->setErrorByName('source', t("Either the path '@link_path' is invalid or you do not have access to it.", ['@link_path' => $source]));
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Remove unnecessary values.
+    $form_state->cleanValues();
+
+    $pid = $form_state->getValue('pid', 0);
+    $source = $form_state->getValue('source');
+    $alias = $form_state->getValue('alias');
+    // Language is only set if language.module is enabled, otherwise save for all
+    // languages.
+    $langcode = $form_state->getValue('langcode', LanguageInterface::LANGCODE_NOT_SPECIFIED);
+
+    $this->aliasStorage->save($source, $alias, $langcode, $pid);
+
+    $this->messenger()->addStatus($this->t('The alias has been saved.'));
+    $form_state->setRedirect('path.admin_overview');
+  }
+
+}

2017/web/core/modules/path/src/Plugin/Field/FieldType/PathFieldItemList.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Drupal\path\Plugin\Field\FieldType;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Field\FieldItemList;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\TypedData\ComputedItemListTrait;
+
+/**
+ * Represents a configurable entity path field.
+ */
+class PathFieldItemList extends FieldItemList {
+
+  use ComputedItemListTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function computeValue() {
+    // Default the langcode to the current language if this is a new entity or
+    // there is no alias for an existent entity.
+    // @todo Set the langcode to not specified for untranslatable fields
+    //   in https://www.drupal.org/node/2689459.
+    $value = ['langcode' => $this->getLangcode()];
+
+    $entity = $this->getEntity();
+    if (!$entity->isNew()) {
+      $conditions = [
+        'source' => '/' . $entity->toUrl()->getInternalPath(),
+        'langcode' => $this->getLangcode(),
+      ];
+      $alias = \Drupal::service('path.alias_storage')->load($conditions);
+      if ($alias === FALSE) {
+        // Fall back to non-specific language.
+        if ($this->getLangcode() !== LanguageInterface::LANGCODE_NOT_SPECIFIED) {
+          $conditions['langcode'] = LanguageInterface::LANGCODE_NOT_SPECIFIED;
+          $alias = \Drupal::service('path.alias_storage')->load($conditions);
+        }
+      }
+
+      if ($alias) {
+        $value = $alias;
+      }
+    }
+
+    $this->list[0] = $this->createItem(0, $value);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultAccess($operation = 'view', AccountInterface $account = NULL) {
+    if ($operation == 'view') {
+      return AccessResult::allowed();
+    }
+    return AccessResult::allowedIfHasPermissions($account, ['create url aliases', 'administer url aliases'], 'OR')->cachePerPermissions();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function delete() {
+    // Delete all aliases associated with this entity in the current language.
+    $entity = $this->getEntity();
+    $conditions = [
+      'source' => '/' . $entity->toUrl()->getInternalPath(),
+      'langcode' => $entity->language()->getId(),
+    ];
+    \Drupal::service('path.alias_storage')->delete($conditions);
+  }
+
+}

2017/web/core/modules/path/src/Plugin/Field/FieldType/PathItem.php

@@ -0,0 +1,108 @@
+<?php
+
+namespace Drupal\path\Plugin\Field\FieldType;
+
+use Drupal\Component\Utility\Random;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+use Drupal\Core\Field\FieldItemBase;
+use Drupal\Core\TypedData\DataDefinition;
+
+/**
+ * Defines the 'path' entity field type.
+ *
+ * @FieldType(
+ *   id = "path",
+ *   label = @Translation("Path"),
+ *   description = @Translation("An entity field containing a path alias and related data."),
+ *   no_ui = TRUE,
+ *   default_widget = "path",
+ *   list_class = "\Drupal\path\Plugin\Field\FieldType\PathFieldItemList",
+ *   constraints = {"PathAlias" = {}},
+ * )
+ */
+class PathItem extends FieldItemBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
+    $properties['alias'] = DataDefinition::create('string')
+      ->setLabel(t('Path alias'));
+    $properties['pid'] = DataDefinition::create('integer')
+      ->setLabel(t('Path id'));
+    $properties['langcode'] = DataDefinition::create('string')
+      ->setLabel(t('Language Code'));
+    return $properties;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function schema(FieldStorageDefinitionInterface $field_definition) {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isEmpty() {
+    return ($this->alias === NULL || $this->alias === '') && ($this->pid === NULL || $this->pid === '') && ($this->langcode === NULL || $this->langcode === '');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function preSave() {
+    if ($this->alias !== NULL) {
+      $this->alias = trim($this->alias);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function postSave($update) {
+    // If specified, rely on the langcode property for the language, so that the
+    // existing language of an alias can be kept. That could for example be
+    // unspecified even if the field/entity has a specific langcode.
+    $alias_langcode = ($this->langcode && $this->pid) ? $this->langcode : $this->getLangcode();
+
+    if (!$update) {
+      if ($this->alias) {
+        $entity = $this->getEntity();
+        if ($path = \Drupal::service('path.alias_storage')->save('/' . $entity->urlInfo()->getInternalPath(), $this->alias, $alias_langcode)) {
+          $this->pid = $path['pid'];
+        }
+      }
+    }
+    else {
+      // Delete old alias if user erased it.
+      if ($this->pid && !$this->alias) {
+        \Drupal::service('path.alias_storage')->delete(['pid' => $this->pid]);
+      }
+      // Only save a non-empty alias.
+      elseif ($this->alias) {
+        $entity = $this->getEntity();
+        \Drupal::service('path.alias_storage')->save('/' . $entity->urlInfo()->getInternalPath(), $this->alias, $alias_langcode, $this->pid);
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
+    $random = new Random();
+    $values['alias'] = '/' . str_replace(' ', '-', strtolower($random->sentences(3)));
+    return $values;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function mainPropertyName() {
+    return 'alias';
+  }
+
+}

2017/web/core/modules/path/src/Plugin/Field/FieldWidget/PathWidget.php

@@ -0,0 +1,109 @@
+<?php
+
+namespace Drupal\path\Plugin\Field\FieldWidget;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\WidgetBase;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\Validator\ConstraintViolationInterface;
+
+/**
+ * Plugin implementation of the 'path' widget.
+ *
+ * @FieldWidget(
+ *   id = "path",
+ *   label = @Translation("URL alias"),
+ *   field_types = {
+ *     "path"
+ *   }
+ * )
+ */
+class PathWidget extends WidgetBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
+    $entity = $items->getEntity();
+
+    $element += [
+      '#element_validate' => [[get_class($this), 'validateFormElement']],
+    ];
+    $element['alias'] = [
+      '#type' => 'textfield',
+      '#title' => $element['#title'],
+      '#default_value' => $items[$delta]->alias,
+      '#required' => $element['#required'],
+      '#maxlength' => 255,
+      '#description' => $this->t('Specify an alternative path by which this data can be accessed. For example, type "/about" when writing an about page.'),
+    ];
+    $element['pid'] = [
+      '#type' => 'value',
+      '#value' => $items[$delta]->pid,
+    ];
+    $element['source'] = [
+      '#type' => 'value',
+      '#value' => !$entity->isNew() ? '/' . $entity->toUrl()->getInternalPath() : NULL,
+     ];
+    $element['langcode'] = [
+      '#type' => 'value',
+      '#value' => $items[$delta]->langcode,
+    ];
+
+    // If the advanced settings tabs-set is available (normally rendered in the
+    // second column on wide-resolutions), place the field as a details element
+    // in this tab-set.
+    if (isset($form['advanced'])) {
+      $element += [
+        '#type' => 'details',
+        '#title' => t('URL path settings'),
+        '#open' => !empty($items[$delta]->alias),
+        '#group' => 'advanced',
+        '#access' => $entity->get('path')->access('edit'),
+        '#attributes' => [
+          'class' => ['path-form'],
+        ],
+        '#attached' => [
+          'library' => ['path/drupal.path'],
+        ],
+      ];
+      $element['#weight'] = 30;
+    }
+
+    return $element;
+  }
+
+  /**
+   * Form element validation handler for URL alias form element.
+   *
+   * @param array $element
+   *   The form element.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The form state.
+   */
+  public static function validateFormElement(array &$element, FormStateInterface $form_state) {
+    // Trim the submitted value of whitespace and slashes.
+    $alias = rtrim(trim($element['alias']['#value']), " \\/");
+    if (!empty($alias)) {
+      $form_state->setValueForElement($element['alias'], $alias);
+
+      // Validate that the submitted alias does not exist yet.
+      $is_exists = \Drupal::service('path.alias_storage')->aliasExists($alias, $element['langcode']['#value'], $element['source']['#value']);
+      if ($is_exists) {
+        $form_state->setError($element['alias'], t('The alias is already in use.'));
+      }
+    }
+
+    if ($alias && $alias[0] !== '/') {
+      $form_state->setError($element['alias'], t('The alias needs to start with a slash.'));
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function errorElement(array $element, ConstraintViolationInterface $violation, array $form, FormStateInterface $form_state) {
+    return $element['alias'];
+  }
+
+}

2017/web/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraint.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Drupal\path\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Validation constraint for changing path aliases in pending revisions.
+ *
+ * @Constraint(
+ *   id = "PathAlias",
+ *   label = @Translation("Path alias.", context = "Validation"),
+ * )
+ */
+class PathAliasConstraint extends Constraint {
+
+  public $message = 'You can only change the URL alias for the <em>published</em> version of this content.';
+
+}

2017/web/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraintValidator.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace Drupal\path\Plugin\Validation\Constraint;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * Constraint validator for changing path aliases in pending revisions.
+ */
+class PathAliasConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  private $entityTypeManager;
+
+  /**
+   * Creates a new PathAliasConstraintValidator instance.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   */
+  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity_type.manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validate($value, Constraint $constraint) {
+    $entity = !empty($value->getParent()) ? $value->getEntity() : NULL;
+
+    if ($entity && !$entity->isNew() && !$entity->isDefaultRevision()) {
+      /** @var \Drupal\Core\Entity\ContentEntityInterface $original */
+      $original = $this->entityTypeManager->getStorage($entity->getEntityTypeId())->loadUnchanged($entity->id());
+      $entity_langcode = $entity->language()->getId();
+
+      // Only add the violation if the current translation does not have the
+      // same path alias.
+      if ($original->hasTranslation($entity_langcode)) {
+        if ($value->alias != $original->getTranslation($entity_langcode)->path->alias) {
+          $this->context->addViolation($constraint->message);
+        }
+      }
+    }
+  }
+
+}

2017/web/core/modules/path/src/Plugin/migrate/destination/UrlAlias.php

@@ -0,0 +1,101 @@
+<?php
+
+namespace Drupal\path\Plugin\migrate\destination;
+
+use Drupal\Core\Path\AliasStorage;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Row;
+use Drupal\migrate\Plugin\migrate\destination\DestinationBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+
+/**
+ * @MigrateDestination(
+ *   id = "url_alias"
+ * )
+ */
+class UrlAlias extends DestinationBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The alias storage service.
+   *
+   * @var \Drupal\Core\Path\AliasStorage
+   */
+  protected $aliasStorage;
+
+  /**
+   * Constructs an entity destination plugin.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
+   *   The migration.
+   * @param \Drupal\Core\Path\AliasStorage $alias_storage
+   *   The alias storage service.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, AliasStorage $alias_storage) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration);
+    $this->aliasStorage = $alias_storage;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $migration,
+      $container->get('path.alias_storage')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function import(Row $row, array $old_destination_id_values = []) {
+    $source = $row->getDestinationProperty('source');
+    $alias = $row->getDestinationProperty('alias');
+    $langcode = $row->getDestinationProperty('langcode');
+    $pid = $old_destination_id_values ? $old_destination_id_values[0] : NULL;
+
+    // Check if this alias is for a node and if that node is a translation.
+    if (preg_match('/^\/node\/\d+$/', $source) && $row->hasDestinationProperty('node_translation')) {
+
+      // Replace the alias source with the translation source path.
+      $node_translation = $row->getDestinationProperty('node_translation');
+      $source = '/node/' . $node_translation[0];
+      $langcode = $node_translation[1];
+    }
+
+    $path = $this->aliasStorage->save($source, $alias, $langcode, $pid);
+
+    return [$path['pid']];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    $ids['pid']['type'] = 'integer';
+    return $ids;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields(MigrationInterface $migration = NULL) {
+    return [
+      'pid' => 'The path id',
+      'source' => 'The source path.',
+      'alias' => 'The URL alias.',
+      'langcode' => 'The language code for the URL.',
+    ];
+  }
+
+}

2017/web/core/modules/path/src/Plugin/migrate/process/d6/UrlAliasLanguage.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Drupal\path\Plugin\migrate\process\d6;
+
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+use Drupal\Core\Language\LanguageInterface;
+
+/**
+ * Url alias language code process.
+ *
+ * @MigrateProcessPlugin(
+ *   id = "d6_url_alias_language"
+ * )
+ */
+class UrlAliasLanguage extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    $langcode = ($value === '') ? LanguageInterface::LANGCODE_NOT_SPECIFIED : $value;
+    return $langcode;
+  }
+
+}

2017/web/core/modules/path/src/Plugin/migrate/source/UrlAliasBase.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Drupal\path\Plugin\migrate\source;
+
+use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
+
+/**
+ * Base class for the url_alias source plugins.
+ */
+abstract class UrlAliasBase extends DrupalSqlBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function query() {
+    // The order of the migration is significant since
+    // \Drupal\Core\Path\AliasStorage::lookupPathAlias() orders by pid before
+    // returning a result. Postgres does not automatically order by primary key
+    // therefore we need to add a specific order by.
+    return $this->select('url_alias', 'ua')->fields('ua')->orderBy('pid');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    return [
+      'pid' => $this->t('The numeric identifier of the path alias.'),
+      'language' => $this->t('The language code of the URL alias.'),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    $ids['pid']['type'] = 'integer';
+    return $ids;
+  }
+
+}

2017/web/core/modules/path/src/Plugin/migrate/source/d6/UrlAlias.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Drupal\path\Plugin\migrate\source\d6;
+
+use Drupal\path\Plugin\migrate\source\UrlAliasBase;
+
+/**
+ * URL aliases source from database.
+ *
+ * @MigrateSource(
+ *   id = "d6_url_alias",
+ *   source_module = "path"
+ * )
+ */
+class UrlAlias extends UrlAliasBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    $fields = parent::fields();
+    $fields['src'] = $this->t('The internal system path.');
+    $fields['dst'] = $this->t('The path alias.');
+    return $fields;
+  }
+
+}

2017/web/core/modules/path/src/Plugin/migrate/source/d7/UrlAlias.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Drupal\path\Plugin\migrate\source\d7;
+
+use Drupal\path\Plugin\migrate\source\UrlAliasBase;
+
+/**
+ * URL aliases source from database.
+ *
+ * @MigrateSource(
+ *   id = "d7_url_alias",
+ *   source_module = "path"
+ * )
+ */
+class UrlAlias extends UrlAliasBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields() {
+    $fields = parent::fields();
+    $fields['source'] = $this->t('The internal system path.');
+    $fields['alias'] = $this->t('The path alias.');
+    return $fields;
+  }
+
+}

2017/web/core/modules/path/src/Tests/PathTestBase.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Drupal\path\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Provides a base class for testing the Path module.
+ *
+ * @deprecated Scheduled for removal in Drupal 9.0.0.
+ *   Use \Drupal\Tests\path\Functional\PathTestBase instead.
+ */
+abstract class PathTestBase extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['node', 'path'];
+
+  protected function setUp() {
+    parent::setUp();
+
+    // Create Basic page and Article node types.
+    if ($this->profile != 'standard') {
+      $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page']);
+      $this->drupalCreateContentType(['type' => 'article', 'name' => 'Article']);
+    }
+  }
+
+}