URL in image src are not rewritten

[sim-random]

🐞 Bug Report

Type:

• Bug
• Feature
• Question

Description:

URLs in image src are not rewritten with the onion address, causing images to load from clearnet.

Steps to Reproduce (for bugs):

1. Install a new wordpress instance with a basic theme (eg. twentytwentyfive) and enable onionify plugin
2. Setup an onion for the site and configure the mapped address in onionify settings
3. Create a new post with an image block, from an image uploaded in media
4. Browse to the newly created post

Expected Behavior:

Images should be loaded from the onion address.
Instead, the src attribute of img tags loads from the clearnet address.

Environment:

• WordPress Version: 6.9.7
• PHP Version: php-fpm 8.4.25
• Onionify Version: 1.0.4
• Server / Hosting: Self-hosted

[sim-random]

From what I understand, the image block code (https://github.com/WordPress/gutenberg/blob/trunk/packages/block-library/src/image/) saves the HTML content of the block in the database with the src hard-coded. The render code seems to reuse the src as-is, leaving no chance for the content_url filter of onionify to edit the url.

I am not very familiar with wordpress development, so I am not sure of what could be a clean fix.
Thanks a lot for this plugin though, it looks carefully crafted and is already very useful as-is.