49 lines
2.7 KiB
JavaScript
49 lines
2.7 KiB
JavaScript
// audio URL rewriting for download managers (IDM / 迅雷 / FDM …) — see shared/media.js for the why.
|
|
//
|
|
// The game plays audio with fetch() + Web Audio (`audio.js`): it never uses <audio src>, <a download> or a
|
|
// navigation. Download managers do not care — their browser integration hooks XHR/fetch whose URL ends in a
|
|
// media extension and (usually above ~1 MB) pops up "下载文件信息" for every BGM track. That dialog has nothing
|
|
// to do with the game, but players see it and blame the game.
|
|
//
|
|
// So audio is fetched through a same-origin, extension-less path instead:
|
|
//
|
|
// /assets/audio/bgm/act1.mp3 → /media/bgm/act1
|
|
//
|
|
// `server/http/media.js` resolves /media/… back to the real file under public/assets/audio and still answers with
|
|
// `Content-Type: audio/mpeg` + range support; Web Audio sniffs the container, so the URL is all the same to it.
|
|
// A host that does not implement /media/ keeps working: `audio.js` falls back to the original URL whenever the
|
|
// /media/ response is unusable (a 404, or a 200 that is not audio at all — some static hosts answer a missing
|
|
// path with the SPA's index.html).
|
|
import { MEDIA_PREFIX, AUDIO_EXTS } from '../../shared/media.js';
|
|
|
|
const AUDIO_PATH = /^\/assets\/audio\/(.+)$/i;
|
|
|
|
/**
|
|
* Rewrite an audio URL to its extension-less `/media/…` form.
|
|
*
|
|
* Returns the input unchanged when the URL is not one of our audio assets, points at another origin (a CDN
|
|
* serves media itself, so the download-manager problem is not ours to solve there), or would produce a path the
|
|
* server refuses (empty / dot segments).
|
|
* @param {string} url
|
|
* @param {string} [origin] origin of the page; defaults to `location.origin`
|
|
* @returns {string} a URL safe to pass to fetch()
|
|
*/
|
|
export function mediaUrl(url, origin = globalThis.location?.origin) {
|
|
if (typeof url !== 'string' || !url) return url;
|
|
let u;
|
|
// No origin known (Node / tests): parse relative URLs against a placeholder, absolute ones are rejected below.
|
|
try { u = new URL(url, origin || 'http://localhost'); } catch { return url; }
|
|
// Cross-origin (or absolute while the page origin is unknown) stays untouched: that host serves its own media.
|
|
const absolute = /^[a-z][a-z0-9+.-]*:/i.test(url) || url.startsWith('//');
|
|
if (origin ? u.origin !== origin : absolute) return url;
|
|
const m = AUDIO_PATH.exec(u.pathname);
|
|
if (!m) return url;
|
|
let rest = m[1];
|
|
const ext = AUDIO_EXTS.find((e) => rest.toLowerCase().endsWith(e));
|
|
if (!ext) return url; // not a file we serve as audio (e.g. "x.mp3.bak") — leave it alone
|
|
rest = rest.slice(0, -ext.length);
|
|
const segments = rest.split('/');
|
|
if (!rest || segments.some((s) => !s || s === '.' || s === '..' || s.startsWith('.'))) return url;
|
|
return `${MEDIA_PREFIX}${rest}${u.search}`;
|
|
}
|