1
You can do this automatically by creating your own text filter in a custom module.
Note that the /** @Filter ... */ in front of the class is not a comment, but an annotation, it has to be included in the file. Replace all fancy uppercase stuff with your own code.
src/Plugin/Filter/MYFANCYFILTER.php
<?php
namespace Drupal\MY_MODULE\Plugin\Filter;
use ...
1
In Drupal 8 you can use the file_url_generator service
Drupal::service('file_url_generator')->generateAbsoluteString($uri)
Because the file_create_url($uri) function is deprecated:
https://www.drupal.org/node/2940031
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