138 lines
4.3 KiB
PHP
138 lines
4.3 KiB
PHP
<?php
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/**
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* @file
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* Hooks for file module.
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*/
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/**
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* @addtogroup hooks
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* @{
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*/
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/**
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* Check that files meet a given criteria.
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*
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* This hook lets modules perform additional validation on files. They're able
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* to report a failure by returning one or more error messages.
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*
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* @param \Drupal\file\FileInterface $file
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* The file entity being validated.
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* @return
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* An array of error messages. If there are no problems with the file return
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* an empty array.
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*
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* @see file_validate()
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*/
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function hook_file_validate(Drupal\file\FileInterface $file) {
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$errors = array();
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if (!$file->getFilename()) {
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$errors[] = t("The file's name is empty. Please give a name to the file.");
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}
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if (strlen($file->getFilename()) > 255) {
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$errors[] = t("The file's name exceeds the 255 characters limit. Please rename the file and try again.");
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}
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return $errors;
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}
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/**
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* Respond to a file that has been copied.
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*
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* @param \Drupal\file\FileInterface $file
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* The newly copied file entity.
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* @param \Drupal\file\FileInterface $source
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* The original file before the copy.
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*
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* @see file_copy()
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*/
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function hook_file_copy(Drupal\file\FileInterface $file, Drupal\file\FileInterface $source) {
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// Make sure that the file name starts with the owner's user name.
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if (strpos($file->getFilename(), $file->getOwner()->name) !== 0) {
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$file->setFilename($file->getOwner()->name . '_' . $file->getFilename());
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$file->save();
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\Drupal::logger('file')->notice('Copied file %source has been renamed to %destination', array('%source' => $source->filename, '%destination' => $file->getFilename()));
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}
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}
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/**
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* Respond to a file that has been moved.
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*
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* @param \Drupal\file\FileInterface $file
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* The updated file entity after the move.
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* @param \Drupal\file\FileInterface $source
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* The original file entity before the move.
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*
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* @see file_move()
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*/
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function hook_file_move(Drupal\file\FileInterface $file, Drupal\file\FileInterface $source) {
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// Make sure that the file name starts with the owner's user name.
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if (strpos($file->getFilename(), $file->getOwner()->name) !== 0) {
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$file->setFilename($file->getOwner()->name . '_' . $file->getFilename());
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$file->save();
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\Drupal::logger('file')->notice('Moved file %source has been renamed to %destination', array('%source' => $source->filename, '%destination' => $file->getFilename()));
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}
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}
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/**
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* Control download access to files.
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*
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* The hook is typically implemented to limit access based on the entity that
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* references the file; for example, only users with access to a node should be
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* allowed to download files attached to that node.
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*
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* @param $field
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* The field to which the file belongs.
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* @param \Drupal\Core\Entity\EntityInterface $entity
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* The entity which references the file.
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* @param \Drupal\file\FileInterface $file
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* The file entity that is being requested.
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*
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* @return
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* TRUE is access should be allowed by this entity or FALSE if denied. Note
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* that denial may be overridden by another entity controller, making this
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* grant permissive rather than restrictive.
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*
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* @see hook_entity_field_access().
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*/
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function hook_file_download_access($field, Drupal\Core\Entity\EntityInterface $entity, Drupal\file\FileInterface $file) {
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if ($entity->getEntityTypeId() == 'node') {
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return $entity->access('view');
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}
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}
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/**
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* Alter the access rules applied to a file download.
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*
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* Entities that implement file management set the access rules for their
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* individual files. Module may use this hook to create custom access rules
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* for file downloads.
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*
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* @see hook_file_download_access().
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*
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* @param $grants
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* An array of grants gathered by hook_file_download_access(). The array is
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* keyed by the module that defines the entity type's access control; the
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* values are Boolean grant responses for each module.
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* @param array $context
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* An associative array containing the following key-value pairs:
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* - field: The field to which the file belongs.
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* - entity: The entity which references the file.
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* - file: The file entity that is being requested.
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*
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* @see hook_file_download_access().
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*/
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function hook_file_download_access_alter(&$grants, $context) {
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// For our example module, we always enforce the rules set by node module.
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if (isset($grants['node'])) {
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$grants = array('node' => $grants['node']);
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}
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}
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/**
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* @} End of "addtogroup hooks".
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*/
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