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scratch-gui/src/lib/unity-cdn.js

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+import CONFIG from '../playground/config.js';
+
+/**
+ * 纯 CDN 根路径。
+ * 方案 A（默认）：始终返回 unityCdnRemote，浏览器直连 OSS（须配置 OSS CORS）。
+ * 方案 B：unityCdnUseSiteProxy / unityCdnUseDevProxy 为 true 时走 /cdn-unity 同源代理。
+ */
+export function getUnityCdnRoot() {
+    if (!CONFIG.usecdn) {
+        return '/unity';
+    }
+    const useProxy = CONFIG.unityCdnUseSiteProxy || CONFIG.unityCdnUseDevProxy;
+    if (useProxy && CONFIG.unityCdnDevProxy) {
+        return CONFIG.unityCdnDevProxy;
+    }
+    return CONFIG.unityCdnRemote || CONFIG.unitycdndir;
+}
+
+export function getUnityCdnBuildRoot() {
+    return `${getUnityCdnRoot()}/Build`;
+}
+
+/** 预取关卡库并注入，避免 LevelDatabase 回退到 /unity/ 或 editor 相对路径 */
+export async function prefetchLevelsDatabase(cdnRoot) {
+    const root = String(cdnRoot || getUnityCdnRoot()).replace(/\/$/, '');
+    const jsonUrl = `${root}/levels-database.json`;
+    window.__tfrhLevelsDatabaseUrl = jsonUrl;
+
+    if (window.__tfrhLevelsDatabaseJson) {
+        return;
+    }
+
+    const brUrl = jsonUrl.replace(/\.json(\?.*)?$/i, '.json.br$1');
+
+    if (typeof DecompressionStream !== 'undefined') {
+        try {
+            const brRes = await fetch(brUrl);
+            if (brRes.ok) {
+                const text = await new Response(await brRes.arrayBuffer())
+                    .pipeThrough(new DecompressionStream('brotli'))
+                    .text();
+                window.__tfrhLevelsDatabaseJson = JSON.parse(text);
+                return;
+            }
+        } catch (e) {
+            console.warn('[unity-cdn] levels-database.json.br 预取失败，尝试 .json', e);
+        }
+    }
+
+    const res = await fetch(jsonUrl);
+    if (!res.ok) {
+        throw new Error(`levels-database HTTP ${res.status}: ${jsonUrl}`);
+    }
+    window.__tfrhLevelsDatabaseJson = await res.json();
+}