3 namespace Drupal\link\Plugin\Field\FieldWidget;
5 use Drupal\Core\Entity\Element\EntityAutocomplete;
6 use Drupal\Core\Field\FieldItemListInterface;
7 use Drupal\Core\Field\WidgetBase;
8 use Drupal\Core\Form\FormStateInterface;
9 use Drupal\link\LinkItemInterface;
10 use Symfony\Component\Validator\ConstraintViolation;
11 use Symfony\Component\Validator\ConstraintViolationListInterface;
14 * Plugin implementation of the 'link' widget.
17 * id = "link_default",
18 * label = @Translation("Link"),
24 class LinkWidget extends WidgetBase {
29 public static function defaultSettings() {
31 'placeholder_url' => '',
32 'placeholder_title' => '',
33 ] + parent::defaultSettings();
37 * Gets the URI without the 'internal:' or 'entity:' scheme.
39 * The following two forms of URIs are transformed:
40 * - 'entity:' URIs: to entity autocomplete ("label (entity id)") strings;
41 * - 'internal:' URIs: the scheme is stripped.
43 * This method is the inverse of ::getUserEnteredStringAsUri().
46 * The URI to get the displayable string for.
50 * @see static::getUserEnteredStringAsUri()
52 protected static function getUriAsDisplayableString($uri) {
53 $scheme = parse_url($uri, PHP_URL_SCHEME);
55 // By default, the displayable string is the URI.
56 $displayable_string = $uri;
58 // A different displayable string may be chosen in case of the 'internal:'
59 // or 'entity:' built-in schemes.
60 if ($scheme === 'internal') {
61 $uri_reference = explode(':', $uri, 2)[1];
63 // @todo '<front>' is valid input for BC reasons, may be removed by
64 // https://www.drupal.org/node/2421941
65 $path = parse_url($uri, PHP_URL_PATH);
67 $uri_reference = '<front>' . substr($uri_reference, 1);
70 $displayable_string = $uri_reference;
72 elseif ($scheme === 'entity') {
73 list($entity_type, $entity_id) = explode('/', substr($uri, 7), 2);
74 // Show the 'entity:' URI as the entity autocomplete would.
75 // @todo Support entity types other than 'node'. Will be fixed in
76 // https://www.drupal.org/node/2423093.
77 if ($entity_type == 'node' && $entity = \Drupal::entityTypeManager()->getStorage($entity_type)->load($entity_id)) {
78 $displayable_string = EntityAutocomplete::getEntityLabels([$entity]);
82 return $displayable_string;
86 * Gets the user-entered string as a URI.
88 * The following two forms of input are mapped to URIs:
89 * - entity autocomplete ("label (entity id)") strings: to 'entity:' URIs;
90 * - strings without a detectable scheme: to 'internal:' URIs.
92 * This method is the inverse of ::getUriAsDisplayableString().
94 * @param string $string
95 * The user-entered string.
98 * The URI, if a non-empty $uri was passed.
100 * @see static::getUriAsDisplayableString()
102 protected static function getUserEnteredStringAsUri($string) {
103 // By default, assume the entered string is an URI.
106 // Detect entity autocomplete string, map to 'entity:' URI.
107 $entity_id = EntityAutocomplete::extractEntityIdFromAutocompleteInput($string);
108 if ($entity_id !== NULL) {
109 // @todo Support entity types other than 'node'. Will be fixed in
110 // https://www.drupal.org/node/2423093.
111 $uri = 'entity:node/' . $entity_id;
113 // Detect a schemeless string, map to 'internal:' URI.
114 elseif (!empty($string) && parse_url($string, PHP_URL_SCHEME) === NULL) {
115 // @todo '<front>' is valid input for BC reasons, may be removed by
116 // https://www.drupal.org/node/2421941
117 // - '<front>' -> '/'
118 // - '<front>#foo' -> '/#foo'
119 if (strpos($string, '<front>') === 0) {
120 $string = '/' . substr($string, strlen('<front>'));
122 $uri = 'internal:' . $string;
129 * Form element validation handler for the 'uri' element.
131 * Disallows saving inaccessible or untrusted URLs.
133 public static function validateUriElement($element, FormStateInterface $form_state, $form) {
134 $uri = static::getUserEnteredStringAsUri($element['#value']);
135 $form_state->setValueForElement($element, $uri);
137 // If getUserEnteredStringAsUri() mapped the entered value to a 'internal:'
138 // URI , ensure the raw value begins with '/', '?' or '#'.
139 // @todo '<front>' is valid input for BC reasons, may be removed by
140 // https://www.drupal.org/node/2421941
141 if (parse_url($uri, PHP_URL_SCHEME) === 'internal' && !in_array($element['#value'][0], ['/', '?', '#'], TRUE) && substr($element['#value'], 0, 7) !== '<front>') {
142 $form_state->setError($element, t('Manually entered paths should start with /, ? or #.'));
148 * Form element validation handler for the 'title' element.
150 * Conditionally requires the link title if a URL value was filled in.
152 public static function validateTitleElement(&$element, FormStateInterface $form_state, $form) {
153 if ($element['uri']['#value'] !== '' && $element['title']['#value'] === '') {
154 $element['title']['#required'] = TRUE;
155 // We expect the field name placeholder value to be wrapped in t() here,
156 // so it won't be escaped again as it's already marked safe.
157 $form_state->setError($element['title'], t('@name field is required.', ['@name' => $element['title']['#title']]));
164 public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
165 /** @var \Drupal\link\LinkItemInterface $item */
166 $item = $items[$delta];
170 '#title' => $this->t('URL'),
171 '#placeholder' => $this->getSetting('placeholder_url'),
172 // The current field value could have been entered by a different user.
173 // However, if it is inaccessible to the current user, do not display it
175 '#default_value' => (!$item->isEmpty() && (\Drupal::currentUser()->hasPermission('link to any page') || $item->getUrl()->access())) ? static::getUriAsDisplayableString($item->uri) : NULL,
176 '#element_validate' => [[get_called_class(), 'validateUriElement']],
177 '#maxlength' => 2048,
178 '#required' => $element['#required'],
179 '#link_type' => $this->getFieldSetting('link_type'),
182 // If the field is configured to support internal links, it cannot use the
183 // 'url' form element and we have to do the validation ourselves.
184 if ($this->supportsInternalLinks()) {
185 $element['uri']['#type'] = 'entity_autocomplete';
186 // @todo The user should be able to select an entity type. Will be fixed
187 // in https://www.drupal.org/node/2423093.
188 $element['uri']['#target_type'] = 'node';
189 // Disable autocompletion when the first character is '/', '#' or '?'.
190 $element['uri']['#attributes']['data-autocomplete-first-character-blacklist'] = '/#?';
192 // The link widget is doing its own processing in
193 // static::getUriAsDisplayableString().
194 $element['uri']['#process_default_value'] = FALSE;
197 // If the field is configured to allow only internal links, add a useful
198 // element prefix and description.
199 if (!$this->supportsExternalLinks()) {
200 $element['uri']['#field_prefix'] = rtrim(\Drupal::url('<front>', [], ['absolute' => TRUE]), '/');
201 $element['uri']['#description'] = $this->t('This must be an internal path such as %add-node. You can also start typing the title of a piece of content to select it. Enter %front to link to the front page.', ['%add-node' => '/node/add', '%front' => '<front>']);
203 // If the field is configured to allow both internal and external links,
204 // show a useful description.
205 elseif ($this->supportsExternalLinks() && $this->supportsInternalLinks()) {
206 $element['uri']['#description'] = $this->t('Start typing the title of a piece of content to select it. You can also enter an internal path such as %add-node or an external URL such as %url. Enter %front to link to the front page.', ['%front' => '<front>', '%add-node' => '/node/add', '%url' => 'http://example.com']);
208 // If the field is configured to allow only external links, show a useful
210 elseif ($this->supportsExternalLinks() && !$this->supportsInternalLinks()) {
211 $element['uri']['#description'] = $this->t('This must be an external URL such as %url.', ['%url' => 'http://example.com']);
214 $element['title'] = [
215 '#type' => 'textfield',
216 '#title' => $this->t('Link text'),
217 '#placeholder' => $this->getSetting('placeholder_title'),
218 '#default_value' => isset($items[$delta]->title) ? $items[$delta]->title : NULL,
220 '#access' => $this->getFieldSetting('title') != DRUPAL_DISABLED,
222 // Post-process the title field to make it conditionally required if URL is
223 // non-empty. Omit the validation on the field edit form, since the field
224 // settings cannot be saved otherwise.
225 if (!$this->isDefaultValueWidget($form_state) && $this->getFieldSetting('title') == DRUPAL_REQUIRED) {
226 $element['#element_validate'][] = [get_called_class(), 'validateTitleElement'];
229 // Exposing the attributes array in the widget is left for alternate and more
230 // advanced field widgets.
231 $element['attributes'] = [
234 '#value' => !empty($items[$delta]->options['attributes']) ? $items[$delta]->options['attributes'] : [],
235 '#attributes' => ['class' => ['link-field-widget-attributes']],
238 // If cardinality is 1, ensure a proper label is output for the field.
239 if ($this->fieldDefinition->getFieldStorageDefinition()->getCardinality() == 1) {
240 // If the link title is disabled, use the field definition label as the
241 // title of the 'uri' element.
242 if ($this->getFieldSetting('title') == DRUPAL_DISABLED) {
243 $element['uri']['#title'] = $element['#title'];
245 // Otherwise wrap everything in a details element.
248 '#type' => 'fieldset',
257 * Indicates enabled support for link to routes.
260 * Returns TRUE if the LinkItem field is configured to support links to
261 * routes, otherwise FALSE.
263 protected function supportsInternalLinks() {
264 $link_type = $this->getFieldSetting('link_type');
265 return (bool) ($link_type & LinkItemInterface::LINK_INTERNAL);
269 * Indicates enabled support for link to external URLs.
272 * Returns TRUE if the LinkItem field is configured to support links to
273 * external URLs, otherwise FALSE.
275 protected function supportsExternalLinks() {
276 $link_type = $this->getFieldSetting('link_type');
277 return (bool) ($link_type & LinkItemInterface::LINK_EXTERNAL);
283 public function settingsForm(array $form, FormStateInterface $form_state) {
284 $elements = parent::settingsForm($form, $form_state);
286 $elements['placeholder_url'] = [
287 '#type' => 'textfield',
288 '#title' => $this->t('Placeholder for URL'),
289 '#default_value' => $this->getSetting('placeholder_url'),
290 '#description' => $this->t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
292 $elements['placeholder_title'] = [
293 '#type' => 'textfield',
294 '#title' => $this->t('Placeholder for link text'),
295 '#default_value' => $this->getSetting('placeholder_title'),
296 '#description' => $this->t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
299 ':input[name="instance[settings][title]"]' => ['value' => DRUPAL_DISABLED],
310 public function settingsSummary() {
313 $placeholder_title = $this->getSetting('placeholder_title');
314 $placeholder_url = $this->getSetting('placeholder_url');
315 if (empty($placeholder_title) && empty($placeholder_url)) {
316 $summary[] = $this->t('No placeholders');
319 if (!empty($placeholder_title)) {
320 $summary[] = $this->t('Title placeholder: @placeholder_title', ['@placeholder_title' => $placeholder_title]);
322 if (!empty($placeholder_url)) {
323 $summary[] = $this->t('URL placeholder: @placeholder_url', ['@placeholder_url' => $placeholder_url]);
333 public function massageFormValues(array $values, array $form, FormStateInterface $form_state) {
334 foreach ($values as &$value) {
335 $value['uri'] = static::getUserEnteredStringAsUri($value['uri']);
336 $value += ['options' => []];
345 * Override the '%uri' message parameter, to ensure that 'internal:' URIs
346 * show a validation error message that doesn't mention that scheme.
348 public function flagErrors(FieldItemListInterface $items, ConstraintViolationListInterface $violations, array $form, FormStateInterface $form_state) {
349 /** @var \Symfony\Component\Validator\ConstraintViolationInterface $violation */
350 foreach ($violations as $offset => $violation) {
351 $parameters = $violation->getParameters();
352 if (isset($parameters['@uri'])) {
353 $parameters['@uri'] = static::getUriAsDisplayableString($parameters['@uri']);
354 $violations->set($offset, new ConstraintViolation(
355 $this->t($violation->getMessageTemplate(), $parameters),
356 $violation->getMessageTemplate(),
358 $violation->getRoot(),
359 $violation->getPropertyPath(),
360 $violation->getInvalidValue(),
361 $violation->getPlural(),
362 $violation->getCode()
366 parent::flagErrors($items, $violations, $form, $form_state);