Validate File Extension IN Drupal 8 Entity Form - forms

Question

I have an Entity in Drupal 8 named visual_tracker_entity Here is my entity,
/**
* #file
* Contains \Drupal\visual_tracker\Entity\VisaulTrackerEntity.
*/
namespace Drupal\visual_tracker\Entity;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Field\BaseFieldDefinition;
use Drupal\Core\Entity\ContentEntityBase;
use Drupal\Core\Entity\EntityChangedTrait;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\visual_tracker\VisaulTrackerEntityInterface;
use Drupal\user\UserInterface;
/**
* Defines the Visaul tracker entity entity.
*
* #ingroup visual_tracker
*
* #ContentEntityType(
* id = "visaul_tracker_entity",
* label = #Translation("Visaul tracker entity"),
* handlers = {
* "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
* "list_builder" = "Drupal\visual_tracker\VisaulTrackerEntityListBuilder",
* "views_data" = "Drupal\visual_tracker\Entity\VisaulTrackerEntityViewsData",
*
* "form" = {
* "default" = "Drupal\visual_tracker\Form\VisaulTrackerEntityForm",
* "add" = "Drupal\visual_tracker\Form\VisaulTrackerEntityForm",
* "edit" = "Drupal\visual_tracker\Form\VisaulTrackerEntityForm",
* "delete" = "Drupal\visual_tracker\Form\VisaulTrackerEntityDeleteForm",
* },
* "access" = "Drupal\visual_tracker\VisaulTrackerEntityAccessControlHandler",
* "route_provider" = {
* "html" = "Drupal\visual_tracker\VisaulTrackerEntityHtmlRouteProvider",
* },
* },
* base_table = "visaul_tracker_entity",
* admin_permission = "administer visaul tracker entity entities",
* entity_keys = {
* "id" = "id",
* "address" = "address",
* "lat"="lat",
* "lng" = "lng"
* },
* links = {
* "canonical" = "/admin/structure/visaul_tracker_entity/{visaul_tracker_entity}",
* "add-form" = "/admin/structure/visaul_tracker_entity/add",
* "edit-form" = "/admin/structure/visaul_tracker_entity/{visaul_tracker_entity}/edit",
* "delete-form" = "/admin/structure/visaul_tracker_entity/{visaul_tracker_entity}/delete",
* "collection" = "/admin/structure/visaul_tracker_entity",
* },
* field_ui_base_route = "visaul_tracker_entity.settings"
* )
*/
class VisaulTrackerEntity extends ContentEntityBase implements VisaulTrackerEntityInterface {
use EntityChangedTrait;
/**
* {#inheritdoc}
*/
public static function preCreate(EntityStorageInterface $storage_controller, array &$values) {
parent::preCreate($storage_controller, $values);
$values += array(
'user_id' => \Drupal::currentUser()->id(),
);
}
/**
* {#inheritdoc}
*/
public function getName() {
return $this->get('name')->value;
}
/**
* {#inheritdoc}
*/
public function setName($name) {
$this->set('name', $name);
return $this;
}
/**
* {#inheritdoc}
*/
public function getAddress() {
return $this->get('address')->value;
}
/**
* {#inheritdoc}
*/
public function setAddress($address) {
$this->set('address', $address);
return $this;
}
/**
* {#inheritdoc}
*/
public function getLatittude() {
return $this->get('lat')->value;
}
/**
* {#inheritdoc}
*/
public function setLatitude($lat) {
$this->set('lat', $lat);
return $this;
}
/**
* {#inheritdoc}
*/
public function getLongitude() {
return $this->get('lng')->value;
}
/**
* {#inheritdoc}
*/
public function setLongitude($lng) {
$this->set('lng', $lng);
return $this;
}
/**
* {#inheritdoc}
*/
public function getCreatedTime() {
return $this->get('created')->value;
}
/**
* {#inheritdoc}
*/
public function setCreatedTime($timestamp) {
$this->set('created', $timestamp);
return $this;
}
/**
* {#inheritdoc}
*/
public function getOwner() {
return $this->get('user_id')->entity;
}
/**
* {#inheritdoc}
*/
public function getOwnerId() {
return $this->get('user_id')->target_id;
}
/**
* {#inheritdoc}
*/
public function setOwnerId($uid) {
$this->set('user_id', $uid);
return $this;
}
/**
* {#inheritdoc}
*/
public function setOwner(UserInterface $account) {
$this->set('user_id', $account->id());
return $this;
}
/**
* {#inheritdoc}
*/
public function isPublished() {
return (bool) $this->getEntityKey('status');
}
/**
* {#inheritdoc}
*/
public function setPublished($published) {
$this->set('status', $published ? NODE_PUBLISHED : NODE_NOT_PUBLISHED);
return $this;
}
/**
* {#inheritdoc}
*/
public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
$fields['id'] = BaseFieldDefinition::create('integer')
->setLabel(t('ID'))
->setDescription(t('The ID of the Visaul tracker entity entity.'))
->setReadOnly(TRUE);
$fields['uuid'] = BaseFieldDefinition::create('uuid')
->setLabel(t('UUID'))
->setDescription(t('The UUID of the Visaul tracker entity entity.'))
->setReadOnly(TRUE);
$fields['user_id'] = BaseFieldDefinition::create('entity_reference')
->setLabel(t('Authored by'))
->setDescription(t('The user ID of author of the Visaul tracker entity entity.'))
->setRevisionable(TRUE)
->setSetting('target_type', 'user')
->setSetting('handler', 'default')
->setDefaultValueCallback('Drupal\node\Entity\Node::getCurrentUserId')
->setTranslatable(TRUE)
->setDisplayOptions('view', array(
'label' => 'hidden',
'type' => 'author',
'weight' => 0,
))
->setDisplayOptions('form', array(
'type' => 'entity_reference_autocomplete',
'weight' => 5,
'settings' => array(
'match_operator' => 'CONTAINS',
'size' => '60',
'autocomplete_type' => 'tags',
'placeholder' => '',
),
))
->setDisplayConfigurable('form', TRUE)
->setDisplayConfigurable('view', TRUE);
$fields['my_new_file'] = BaseFieldDefinition::create('file')
->setLabel(t('My New File'))
->setDescription(t('The name of the Visaul tracker entity entity.'))
->setDefaultValue('')
->setDisplayOptions('view', array(
'label' => 'above',
'type' => 'file',
'weight' => -4,
))
->setDisplayOptions('form', array(
'type' => 'file',
'weight' => -4,
))
->setDisplayConfigurable('form', TRUE)
->setDisplayConfigurable('view', TRUE);
$fields['address'] = BaseFieldDefinition::create('string')
->setLabel(t('Address'))
->setDescription(t('The addres of the Visaul tracker entity entity.'))
->setSettings(array(
'max_length' => 250,
'text_processing' => 0,
))
->setDefaultValue('')
->setDisplayOptions('view', array(
'label' => 'above',
'type' => 'string',
'weight' => -4,
))
->setDisplayOptions('form', array(
'type' => 'string_textfield',
'weight' => -4,
))
->setDisplayConfigurable('form', TRUE)
->setDisplayConfigurable('view', TRUE);
$fields['lat'] = BaseFieldDefinition::create('string')
->setLabel(t('Latitiude'))
->setDescription(t('The latiitude of the Visaul tracker entity entity.'))
->setSettings(array(
'max_length' => 50,
'text_processing' => 0,
))
->setDefaultValue('')
->setDisplayOptions('view', array(
'label' => 'above',
'type' => 'string',
'weight' => -4,
))
->setDisplayOptions('form', array(
'type' => 'string_textfield',
'weight' => -4,
))
->setDisplayConfigurable('form', TRUE)
->setDisplayConfigurable('view', TRUE);
$fields['lng'] = BaseFieldDefinition::create('string')
->setLabel(t('Longitude'))
->setDescription(t('The name of the Visaul tracker entity entity.'))
->setSettings(array(
'max_length' => 50,
'text_processing' => 0,
))
->setDefaultValue('')
->setDisplayOptions('view', array(
'label' => 'above',
'type' => 'string',
'weight' => -4,
))
->setDisplayOptions('form', array(
'type' => 'string_textfield',
'weight' => -4,
))
->setDisplayConfigurable('form', TRUE)
->setDisplayConfigurable('view', TRUE);
$fields['status'] = BaseFieldDefinition::create('boolean')
->setLabel(t('Publishing status'))
->setDescription(t('A boolean indicating whether the Visaul tracker entity is published.'))
->setDefaultValue(TRUE);
$fields['langcode'] = BaseFieldDefinition::create('language')
->setLabel(t('Language code'))
->setDescription(t('The language code for the Visaul tracker entity entity.'))
->setDisplayOptions('form', array(
'type' => 'language_select',
'weight' => 10,
))
->setDisplayConfigurable('form', TRUE);
$fields['created'] = BaseFieldDefinition::create('created')
->setLabel(t('Created'))
->setDescription(t('The time that the entity was created.'));
$fields['changed'] = BaseFieldDefinition::create('changed')
->setLabel(t('Changed'))
->setDescription(t('The time that the entity was last edited.'));
return $fields;
}
}
I need add validation rule for file type field. The default file type is come with .txt extension. I want to only allow .xls and .xlsx .
This is the file filed,
$fields['my_new_file'] = BaseFieldDefinition::create('file')
->setLabel(t('My New File'))
->setDescription(t('The name of the Visaul tracker entity entity.'))
->setDefaultValue('')
->setDisplayOptions('view', array(
'label' => 'above',
'type' => 'file',
'weight' => -4,
))
->setDisplayOptions('form', array(
'type' => 'file',
'weight' => -4,
))
->setDisplayConfigurable('form', TRUE)
->setDisplayConfigurable('view', TRUE);
Please help me.

Answer 1

I got the answer after digging drupal 8 core APIs.
If we're using a file field, then we can set the "file_extensions" setting. You can find out more information about a "file" type by going to the FileItem API.
$fields['my_new_file'] = BaseFieldDefinition::create('file')
->setSetting('file_extensions', 'xls xlsx');