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IEngineLoader,
IEngineSourceConfig,
EngineErrorCode,
IFileStorage,
} from "../types.js";
import { EngineError } from "../errors/EngineError.js";
import { SecurityAdvisor } from "../capabilities/SecurityAdvisor.js";
import { createI18nKey } from "../protocol/ProtocolValidator.js";
/**
* 2026 Zenith Tier: エンジンリソース（WASM, JS, Assets）の物理的ロードと SRI 検証を管理。
*/
export class EngineLoader implements IEngineLoader {
private activeBlobs = new Map<string, string>();
private inflight = new Map<string, Promise<string>>();
constructor(private readonly storage?: IFileStorage) {}
/**
* 単一のリソースをロードします。
*/
async loadResource(
engineId: string,
config: IEngineSourceConfig,
): Promise<string> {
this.validateResourceUrl(config, engineId);
const safeId = engineId.replace(/[^a-zA-Z0-9]/g, "_");
const cacheKey = `${safeId}-${encodeURIComponent(config.url)}`;
Iif (this.activeBlobs.has(cacheKey)) {
return this.activeBlobs.get(cacheKey)!;
}
Iif (this.inflight.has(cacheKey)) {
return this.inflight.get(cacheKey)!;
}
const performLoad = async (): Promise<string> => {
try {
Eif (this.storage) {
const cached = await this.storage.get(cacheKey);
if (cached) {
const url = URL.createObjectURL(
new Blob([cached], {
type: this.getMimeType(config.type || "worker-js"),
}),
);
this.activeBlobs.set(cacheKey, url);
return url;
}
}
const fetchOptions = SecurityAdvisor.getSafeFetchOptions(config.sri);
// Protocol safety (HTTPS enforcement) is handled inside SecurityAdvisor.safeFetch().
const response = await SecurityAdvisor.safeFetch(config.url, {
...fetchOptions,
signal: AbortSignal.timeout(30000),
});
if (!response.ok) {
this.inflight.delete(cacheKey);
throw new EngineError({
code: EngineErrorCode.NETWORK_ERROR,
message: `Failed to download engine resource: ${config.url} (${response.status})`,
engineId,
});
}
const buffer = await response.arrayBuffer();
Eif (this.storage) {
void this.storage.set(cacheKey, buffer);
}
const url = URL.createObjectURL(
new Blob([buffer], {
type: this.getMimeType(config.type || "worker-js"),
}),
);
this.activeBlobs.set(cacheKey, url);
return url;
} catch (err) {
this.inflight.delete(cacheKey);
if (err instanceof EngineError) throw err;
throw new EngineError({
code: EngineErrorCode.NETWORK_ERROR,
message: `Failed to fetch engine resource: ${config.url}`,
engineId,
// originalError は IEngineError に定義されていないため message に含めるかキャスト
});
} finally {
this.inflight.delete(cacheKey);
}
};
const loadPromise = performLoad();
this.inflight.set(cacheKey, loadPromise);
return loadPromise.finally(() => {
this.inflight.delete(cacheKey);
});
}
/**
* 複数のリソースをロードします。
*/
async loadResources(
engineId: string,
sources: Record<string, IEngineSourceConfig>,
): Promise<Record<string, string>> {
const results: Record<string, string> = {};
const localNewUrls = new Set<string>();
try {
for (const [key, config] of Object.entries(sources)) {
const url = await this.loadResource(engineId, config);
results[key] = url;
localNewUrls.add(url);
}
return results;
} catch (err) {
for (const url of localNewUrls) {
this.revoke(url);
}
throw err;
}
}
private validateResourceUrl(
config: IEngineSourceConfig,
engineId: string,
forceProduction?: boolean,
): void {
const url = config.url;
if (!/^[a-zA-Z0-9_-]+$/.test(engineId)) {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: `Invalid engine ID: ${engineId}`,
engineId,
i18nKey: createI18nKey("engine.errors.invalidEngineId"),
});
}
if (url.toLowerCase().startsWith("http:")) {
let parsedUrl: URL;
try {
parsedUrl = new URL(url);
} catch {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: `Invalid URL format: ${url}`,
engineId,
i18nKey: createI18nKey("engine.errors.insecureConnection"),
});
}
if (!SecurityAdvisor.isLoopbackHost(parsedUrl.hostname)) {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: `Insecure connection (HTTP) is not allowed: ${url}`,
engineId,
i18nKey: createI18nKey("engine.errors.insecureConnection"),
});
}
}
if (config.__unsafeNoSRI) {
const isProd =
forceProduction ??
((typeof process !== "undefined" &&
process.env["NODE_ENV"] === "production") ||
(globalThis as Record<string, unknown>).NODE_ENV === "production");
if (isProd) {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: "SRI bypass (__unsafeNoSRI) is not allowed in production.",
engineId,
i18nKey: createI18nKey("engine.errors.sriBypassNotAllowed"),
});
}
} else if (!config.sri) {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: `SRI hash is required for resource: ${url}`,
engineId,
i18nKey: createI18nKey("engine.errors.securityError"),
});
}
}
/**
* 特定のエンジンのリソースを物理的に解放します。
*/
revokeByEngineId(engineId: string): void {
const safeId = engineId.replace(/[^a-zA-Z0-9]/g, "_");
const prefix = `${safeId}-`;
for (const [key, url] of this.activeBlobs.entries()) {
if (key.startsWith(prefix)) {
this.revoke(url);
this.activeBlobs.delete(key);
}
}
}
/**
* 全てのリソースを物理的に解放します。
*/
revokeAll(): void {
for (const url of this.activeBlobs.values()) {
this.revoke(url);
}
this.activeBlobs.clear();
this.inflight.clear();
}
/**
* 指定された URL を物理的に解放します。
*/
public revoke(url: string): void {
try {
URL.revokeObjectURL(url);
} catch {
/* ignore */
}
}
private getMimeType(type: string): string {
switch (type) {
case "worker-js":
return "application/javascript";
case "wasm":
return "application/wasm";
case "json":
return "application/json";
case "text":
return "text/plain";
default:
return "application/octet-stream";
}
}
}
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