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import { ISecurityStatus, EngineErrorCode } from "../types.js";
import { EngineError } from "../errors/EngineError.js";
/**
* SRI検証やCOOP/COEPヘッダーの診断を提供します。
*/
export class SecurityAdvisor {
/**
* SRI文字列が有効な形式（W3C規格）かどうかを検証します。
* マルチハッシュ形式をサポートします。
*/
static isValidSRI(sri: string): boolean {
Iif (!sri || typeof sri !== "string") return false;
const hashes = sri.split(/\s+/);
const pattern = /^(sha256|sha384|sha512)-[A-Za-z0-9+/=]+$/;
return hashes.every((h) => pattern.test(h));
}
/**
* 安全な fetch オプションを生成します。
*/
static getSafeFetchOptions(sri?: string): RequestInit {
if (!sri || !SecurityAdvisor.isValidSRI(sri)) return {};
return {
integrity: sri,
mode: "cors",
credentials: "omit",
};
}
/** Allowed protocols for secure resource downloads. */
private static readonly ALLOWED_PROTOCOLS = new Set([
"https:",
"blob:",
"data:",
]);
/**
* Loopback hostnames considered safe for HTTP connections.
* Per W3C Secure Contexts spec, loopback addresses are "potentially trustworthy".
* Subdomains of localhost (e.g. myapp.localhost) are also safe per RFC 6761 §6.3.
* @see https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy
* @see https://www.rfc-editor.org/rfc/rfc6761#section-6.3
*/
private static readonly LOOPBACK_HOSTS = new Set([
"localhost",
"127.0.0.1",
"[::1]",
]);
/**
* Determines if a hostname is a loopback address.
* Includes exact matches (localhost, 127.0.0.1, [::1]) and
* *.localhost subdomains (e.g. myapp.localhost for Portless).
*/
public static isLoopbackHost(hostname: string): boolean {
return (
SecurityAdvisor.LOOPBACK_HOSTS.has(hostname) ||
hostname.endsWith(".localhost")
);
}
/**
* Performs a fetch with protocol-level security enforcement.
* Allowed protocols: HTTPS, blob:, data:.
* HTTP is permitted only for loopback hosts (localhost, 127.0.0.1, [::1])
* per W3C Secure Contexts specification.
* This prevents man-in-the-middle attacks on engine resource downloads.
*/
static async safeFetch(
url: string,
options?: RequestInit,
): Promise<Response> {
// Resolve relative URLs against the current origin (browser) or reject them (non-browser).
const resolved = new URL(url, globalThis.location?.href);
const isAllowedProtocol = SecurityAdvisor.ALLOWED_PROTOCOLS.has(
resolved.protocol,
);
const isLoopbackHttp =
resolved.protocol === "http:" &&
SecurityAdvisor.isLoopbackHost(resolved.hostname);
if (!isAllowedProtocol && !isLoopbackHttp) {
throw new EngineError({
code: EngineErrorCode.SECURITY_ERROR,
message: `Insecure protocol "${resolved.protocol}" is not allowed for remote hosts. Use HTTPS or connect to localhost.`,
i18nKey: createI18nKey("engine.errors.insecureConnection"),
});
}
return fetch(resolved.href, options);
}
/**
* W3C勧告に基づいたマルチハッシュSRI検証。
* 最強のアルゴリズムを優先して検証します。
*/
/**
* SRI ハッシュを検証し、一致しない場合は例外をスローします。
* Refuse by Exception 原則に基づく厳格な検証メソッドです。
*/
static async assertSRI(data: ArrayBuffer, sri: string): Promise<void> {
const isValid = await this.verifySRI(data, sri);
if (!isValid) {
const i18nKey = createI18nKey("engine.errors.sriMismatch");
throw new EngineError({
code: EngineErrorCode.SRI_MISMATCH,
message: "SRI hash verification failed.",
i18nKey,
});
}
}
static async verifySRI(data: ArrayBuffer, sri: string): Promise<boolean> {
Iif (!SecurityAdvisor.isValidSRI(sri)) return false;
const hashes = sri.split(/\s+/);
const algoPriority: Record<string, number> = {
sha256: 1,
sha384: 2,
sha512: 3,
};
const algoMap: Record<string, string> = {
sha256: "SHA-256",
sha384: "SHA-384",
sha512: "SHA-512",
};
// 2026 Best Practice: 最強アルゴリズムを特定
let strongestLevel = 0;
for (const hash of hashes) {
const algo = hash.split("-")[0];
Eif (algo) {
const priority = algoPriority[algo];
Eif (priority !== undefined && priority > strongestLevel) {
strongestLevel = priority;
}
}
}
Iif (strongestLevel === 0) return false;
// 最強レベルのハッシュのうち、いずれか一つにマッチすればOK
for (const hash of hashes) {
const [algo, expectedBase64] = hash.split("-") as [string, string];
if (algoPriority[algo] !== strongestLevel) continue;
const webCryptoAlgo = algoMap[algo];
Iif (!webCryptoAlgo) continue;
const digest = await crypto.subtle.digest(webCryptoAlgo, data);
const actualBase64 = btoa(String.fromCharCode(...new Uint8Array(digest)));
if (actualBase64 === expectedBase64) return true;
}
return false;
}
/**
* セキュリティステータスを診断します。
* COOP/COEPヘッダーの存在を確認します。
*/
static async getStatus(): Promise<ISecurityStatus> {
const isCrossOriginIsolated =
typeof crossOriginIsolated !== "undefined" && crossOriginIsolated;
const missingHeaders: string[] = [];
// 2026 Best Practice: ブラウザ環境でのみヘッダー診断を試行
Iif (typeof window !== "undefined" && typeof fetch !== "undefined") {
try {
// 2026: 5s timeout for diagnostics fetch
const response = await fetch(window.location.href, {
method: "HEAD",
signal: AbortSignal.timeout(5000),
});
const coop = response.headers.get("cross-origin-opener-policy");
const coep = response.headers.get("cross-origin-embedder-policy");
if (!coop) missingHeaders.push("cross-origin-opener-policy");
if (!coep) missingHeaders.push("cross-origin-embedder-policy");
} catch {
// HEADリクエスト失敗時は無視
}
}
const sriSupported = typeof crypto !== "undefined" && !!crypto.subtle;
return {
isCrossOriginIsolated,
canUseThreads: isCrossOriginIsolated,
sriSupported,
sriEnabled: sriSupported,
coopCoepEnabled: isCrossOriginIsolated,
missingHeaders: missingHeaders.length > 0 ? missingHeaders : undefined,
};
}
/**
* 2026 Zenith Tier: 隔離環境を有効化するための具体的なアドバイスを返します。
*/
static getRemediationAdvice(): string {
return `
To enable Multi-threading (SharedArrayBuffer), set the following HTTP headers:
- Cross-Origin-Opener-Policy: same-origin
- Cross-Origin-Embedder-Policy: require-corp
Platform examples:
[Vercel (vercel.json)]
{ "headers": [{ "source": "/(.*)", "headers": [
{ "key": "Cross-Origin-Opener-Policy", "value": "same-origin" },
{ "key": "Cross-Origin-Embedder-Policy", "value": "require-corp" }
]}]}
[Cloudflare Pages (_headers)]
/*
Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp
[Netlify (_headers)]
/*
Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp
`;
}
}
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