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feat: make API base URL runtime-configurable

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The PROD image baked PUBLIC_API_BASE_URL at build time (rsbuild inlines
PUBLIC_* vars), so a prebuilt image could only ever target a same-origin
'/api/v1' and needed a reverse proxy in front. Move the operator default to
runtime so one image can point at any backend origin without rebuilding.

- public/config.js: committed stub setting window.__APP_CONFIG__ = {}, used
  as the dev/build-time default and overwritten in prod at container start.
- rsbuild.config.ts: inject a classic (non-deferred) <script src="/config.js">
  into <head> so it runs before the deferred app bundle.
- src/config/env.ts: DEFAULT_API_BASE_URL now resolves
  window.__APP_CONFIG__.apiBaseUrl > import.meta.env.PUBLIC_API_BASE_URL >
  '/api/v1'. The user-chosen instance still wins over all of these.
- dockerfiles/30-runtime-config.sh: nginx /docker-entrypoint.d hook that
  regenerates /config.js from $PUBLIC_API_BASE_URL on every start.
- Dockerfile.prod: install the hook (build-time ARG is now just a fallback).
- nginx.conf: serve /config.js with Cache-Control: no-store.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Senko-san
2026-06-08 12:40:59 +03:00
parent 451dbb94a8
commit bcfb36d53e
7 changed files with 78 additions and 3 deletions
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src/config/env.ts
+21 -1
View File
@@ -1,2 +1,22 @@
/**
* Default backend base URL — the operator-set fallback used when no specific
* instance is active. Resolution order:
*
* 1. window.__APP_CONFIG__.apiBaseUrl — runtime, injected by the container
* at start from $PUBLIC_API_BASE_URL (see public/config.js). Lets one
* prebuilt image point at any backend origin without rebuilding.
* 2. import.meta.env.PUBLIC_API_BASE_URL — build-time default (rsbuild inlines
* PUBLIC_* vars). Used in local dev and as a baked fallback.
* 3. '/api/v1' — same-origin relative path (works behind a reverse proxy).
*
* The user's chosen instance still wins over all of these — see
* runtime-config.ts / instances.ts.
*/
function runtimeApiBaseUrl(): string | undefined {
if (typeof window === 'undefined') return undefined;
const value = window.__APP_CONFIG__?.apiBaseUrl;
return value ? value : undefined;
}
export const DEFAULT_API_BASE_URL =
import.meta.env.PUBLIC_API_BASE_URL ?? '/api/v1';
runtimeApiBaseUrl() ?? import.meta.env.PUBLIC_API_BASE_URL ?? '/api/v1';