Content Localization uses raw R2 bucket URL instead of S3 CDN URL in translated posts

[David_Ghost]

Hello,

When using content Localization with Discourse AI translations and Cloudflare R2 as S3-compatible storage, the translated post content stores the raw R2 bucket endpoint URL instead of the configured s3_cdn_url (custom domain). Images render broken for all users viewing translations.

Environment

• Discourse: latest
• Cloudflare R2 configured via S3 compatible storage
• s3_cdn_url: https://files.mydomain.com
• s3_use_cdn_url_for_all_uploads: enabled
• Content Localization + Discourse AI translation: enabled

Steps to Reproduce

1. Configure Cloudflare R2 with a custom domain (s3_cdn_url)
2. Enable Content Localization and AI translation
3. Create a post with an image
4. Wait for the AI translation to generate the localized version
5. Switch language — images in the translated version are broken

Observed behavior

The translated content contains URLs like:

//files.myendpoint.r2.cloudflarestorage.com/original/1X/ instead of https://files.mydomain.com/original/1X/

Related bug: Chat thumbnails bypass s3_cdn_url & use raw S3 bucket URLs

a temporary fix is to do a remap or use this tc:

import { apiInitializer } from "discourse/lib/api";

export default apiInitializer("1.8.0", (api) => {
  const badDomain = "files.myendpoint.r2.cloudflarestorage.com";
  const goodDomain = "files.mydomain.com";

  function fixImages() {
    document.querySelectorAll(`img[src*="${badDomain}"]`).forEach(img => {
      img.src = img.src.replace(badDomain, goodDomain);
    });
    document.querySelectorAll(`img[data-src*="${badDomain}"]`).forEach(img => {
      img.dataset.src = img.dataset.src.replace(badDomain, goodDomain);
    });
    document.querySelectorAll(`img[data-large-src*="${badDomain}"]`).forEach(img => {
      img.dataset.largeSrc = img.dataset.largeSrc.replace(badDomain, goodDomain);
    });
  }

  api.decorateCooked(() => fixImages(), { id: "fix-r2-translated-images" });
  api.onPageChange(() => fixImages());
});