Change the name of uploaded file based on content type and entity id

Question

Consider this pattern :

[content type]-[entity ID].[file:ffp-extension-original]

is there any hook so I can change the uploaded file name based on content type and node ID in drupal 8?

PS:

I used File(field) paths module but I couldn't find proper tokens to get it work right

Answer 1

You might be able to do this with hook_ENTITY_TYPE_update(). Take a look at the D8 version of the upload_replace module code for an example of changing filenames.

Answer 2

As I needed to know some data about the node which the file is added to, none of hook_file_update, hook_file_presave or hooks like that was proper for my needs, while I was searching I found a drupal 7 solution, so I changed the code to get it to work.

Here is the module I wrote, this module works on any file and image field :

<?php
/**
 *@file
 * this module alters node forms and adds a submit handler which inside that it renames the uploaded files
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\file\Entity;
use Drupal\Core\Entity\ContentEntityForm;

function file_name_converter_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $bundle = FALSE;
  $form_object = $form_state->getFormObject();
  if ($form_object instanceof ContentEntityForm) {
    $bundle = $form_object->getEntity()->bundle();
    $form_state->set('#bundle_value', $bundle);
    foreach (array_keys($form['actions']) as $action) {
      if ($action != 'preview' && isset($form['actions'][$action]['#type']) && $form['actions'][$action]['#type'] === 'submit') {
        $form['actions'][$action]['#submit'][] = 'file_name_converter_node_form_submit';
      }
    }
  }

}

function file_name_converter_node_form_submit(&$form, FormStateInterface $form_state) {

  $values = $form_state->getValues();
  $bundle = $form_state->get('#bundle_value');

  $bundle_fields = \Drupal::entityManager()->getFieldDefinitions('node', $bundle);

  foreach ($bundle_fields as $field_name => $field_definition) {
    if (!empty($field_definition->getTargetBundle())) {
      $field_type = $field_definition->getType();
      if($field_type == 'image' || $field_type == 'file') {
        if(!empty($values[$field_name])) {
          foreach ($values[$field_name][0]['fids'] as $delta => $fid) {
            $file = file_load($fid);

            $uri = $file->getFileUri();
            $fname = $file->getFilename();
            $exp = explode('.', $fname);
            $extnsn = $exp[count($exp)-1];

            $new_name = 'MySite-' . $field_type . '-' . $bundle . '-' . $values['nid'] . '.' . $extnsn;

            $new_uri = str_replace($fname, $new_name, $uri);

            // And finally rename the file.
            file_move($file, $new_uri);
          }
        }
      }
    }
  }
}