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import { ResourceMap, EngineErrorCode } from "../types.js";
import { EngineError } from "../errors/EngineError.js";
interface MessagePayload {
type: string;
resources?: ResourceMap;
[key: string]: unknown;
}
interface WorkerGlobalScope {
postMessage: (message: unknown) => void;
onmessage: ((ev: MessageEvent) => void) | null;
}
interface EmscriptenFS {
mkdir: (path: string) => void;
writeFile: (path: string, data: Uint8Array) => void;
}
interface EmscriptenModule {
FS?: EmscriptenFS;
locateFile?: (path: string, prefix: string) => string;
[key: string]: unknown;
}
/**
* Worker 側でリソースの注入とパス解決を管理するユーティリティ。
*/
export class ResourceInjector {
private static resources: ResourceMap = {};
private static isReady = false;
private static readyCallbacks: (() => void)[] = [];
/**
* WorkerGlobalScope の型ガード
*/
private static isWorkerScope(obj: unknown): obj is WorkerGlobalScope {
return (
typeof obj === "object" &&
obj !== null &&
"postMessage" in obj &&
typeof (obj as { postMessage?: unknown }).postMessage === "function" &&
"onmessage" in obj &&
!("document" in obj)
);
}
/**
* メッセージを監視し、リソース注入コマンドを処理します。
*/
static listen(onMessage?: (ev: MessageEvent) => void): void {
const handler = (ev: MessageEvent) => {
const data = ev.data;
if (!data || typeof data !== "object") return;
const payload = data as MessagePayload;
if (payload.type === "MG_INJECT_RESOURCES") {
if (
!payload.resources ||
typeof payload.resources !== "object" ||
payload.resources === null
) {
throw new EngineError({
code: EngineErrorCode.PROTOCOL_ERROR,
message:
"[ResourceInjector] Invalid or missing resources in MG_INJECT_RESOURCES",
i18nKey: createI18nKey("engine.errors.protocolError"),
i18nParams: { message: "Invalid resources payload" },
});
}
this.resources = { ...this.resources, ...payload.resources };
this.isReady = true;
Iif (typeof self !== "undefined" && this.isWorkerScope(self)) {
self.postMessage({ type: "MG_RESOURCES_READY" });
}
const callbacks = [...this.readyCallbacks];
this.readyCallbacks = [];
callbacks.forEach((cb) => cb());
return;
}
Eif (onMessage) {
onMessage(ev);
}
};
if (typeof globalThis.addEventListener === "function") {
globalThis.addEventListener("message", handler);
} else if (Etypeof self !== "undefined" && this.isWorkerScope(self)) {
self.onmessage = handler;
}
}
/**
* リソースの注入が完了するまで待機します。
*/
static waitForReady(): Promise<void> {
if (this.isReady) return Promise.resolve();
return new Promise((resolve) => {
this.readyCallbacks.push(resolve);
});
}
/**
* 指定されたパスに対応する Blob URL を返します。
*/
static resolve(path: string): string {
let decodedPath = path;
let prevPath = "";
try {
while (decodedPath !== prevPath) {
prevPath = decodedPath;
decodedPath = decodeURIComponent(decodedPath);
}
} catch {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: `[ResourceInjector] Invalid URL encoding in path: "${path}"`,
i18nKey: createI18nKey("engine.errors.illegalCharacters"),
});
}
const normalizedForCheck = decodedPath.replace(/\\/g, "/");
if (
normalizedForCheck.includes("..") ||
normalizedForCheck.startsWith("/") ||
normalizedForCheck.includes("./")
) {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: `[ResourceInjector] Path pattern detected: "${path}"`,
i18nKey: createI18nKey("engine.errors.securityViolation"),
});
}
const lookupPath = path.startsWith("./") ? path.slice(2) : path;
if (this.resources[lookupPath]) return this.resources[lookupPath];
for (const [mountPath, blobUrl] of Object.entries(this.resources)) {
// 2026: Precise suffix match (ensure it matches a whole segment or the whole path)
Iif (
lookupPath === mountPath ||
(lookupPath.endsWith(mountPath) &&
lookupPath.charAt(lookupPath.length - mountPath.length - 1) === "/")
) {
return blobUrl;
}
}
return path;
}
/**
* global fetch をオーバーライドして、注入されたリソースを自動的に解決します。
*/
static interceptFetch(): void {
const originalFetch = globalThis.fetch;
globalThis.fetch = async (input: RequestInfo | URL, init?: RequestInit) => {
const url =
typeof input === "string"
? input
: input instanceof URL
? input.href
: input.url;
const resolvedUrl = this.resolve(url);
if (resolvedUrl !== url) {
return originalFetch(resolvedUrl, init);
}
return originalFetch(input, init);
};
}
/**
* Emscripten の Module オブジェクトに対してリソース解決ロジックを注入します。
*/
static adaptEmscriptenModule(moduleParams: EmscriptenModule): void {
if (!moduleParams) return;
const originalLocateFile = moduleParams.locateFile;
moduleParams.locateFile = (path: string, prefix: string) => {
const resolved = this.resolve(path);
if (resolved !== path && resolved.startsWith("blob:")) {
return resolved;
}
return originalLocateFile
? originalLocateFile(path, prefix)
: prefix + path;
};
}
/**
* Emscripten の仮想ファイルシステム (FS) にリソースをマウントします。
*/
static async mountToVFS(
moduleInstance: EmscriptenModule,
vfsPath: string,
resourceKey: string,
): Promise<void> {
if (!moduleInstance || !moduleInstance.FS) {
throw new EngineError({
code: EngineErrorCode.INTERNAL_ERROR,
message: "ResourceInjector: Module instance or FS not found.",
i18nKey: createI18nKey("engine.errors.internalError"),
i18nParams: { message: "Module or FS not found" },
});
}
const blobUrl = this.resolve(resourceKey);
// 2026 Zenith Tier: 物理的なリソース境界の強制。
// レジストリ解決値が blob: スキームでない場合は、外部インジェクションとみなして拒否。
if (!blobUrl.startsWith("blob:")) {
throw new EngineError({
code: EngineErrorCode.INTERNAL_ERROR,
message: "Resource not found or invalid scheme in registry",
i18nKey: createI18nKey("engine.errors.internalError"),
i18nParams: { resourceKey }, // 文面ではなくキーのみを渡す
});
}
try {
const response = await globalThis.fetch(blobUrl);
if (!response.ok) {
throw new EngineError({
code: EngineErrorCode.NETWORK_ERROR,
message: `Failed to fetch resource: ${response.statusText}`,
i18nKey: createI18nKey("engine.errors.networkError"),
});
}
const buffer = await response.arrayBuffer();
const data = new Uint8Array(buffer);
const parts = vfsPath.split("/").filter((p) => p);
Eif (parts.length > 1) {
let currentPath = "";
for (let i = 0; i < parts.length - 1; i++) {
currentPath += "/" + parts[i];
try {
moduleInstance.FS.mkdir(currentPath);
} catch (e: unknown) {
Iif (!this.isFsError(e) || e.code !== "EEXIST") throw e;
}
}
}
moduleInstance.FS.writeFile(vfsPath, data);
} catch (error: unknown) {
Eif (error instanceof EngineError) throw error;
throw new EngineError({
code: EngineErrorCode.INTERNAL_ERROR,
message: `Failed to mount "${resourceKey}" to "${vfsPath}": ${error}`,
i18nKey: createI18nKey("engine.errors.internalError"),
i18nParams: { message: `Mount failed: ${resourceKey}` },
});
}
}
private static isFsError(e: unknown): e is { code: string } {
return (
typeof e === "object" &&
e !== null &&
"code" in e &&
typeof (e as { code: unknown }).code === "string"
);
}
}
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