import { decodeBase64 } from "../encode.js";
import { getRuntimeKey } from "../../helper/adapter/index.js";
import { JwtAlgorithmNotImplemented } from "./types.js";
import { utf8Encoder } from "./utf8.js";
//#region src/utils/jwt/jws.ts
/**
* @module
* JSON Web Signature (JWS)
* https://datatracker.ietf.org/doc/html/rfc7515
*/
async function signing(privateKey, alg, data) {
	const algorithm = getKeyAlgorithm(alg);
	const cryptoKey = await importPrivateKey(privateKey, algorithm);
	return await crypto.subtle.sign(algorithm, cryptoKey, data);
}
async function verifying(publicKey, alg, signature, data) {
	const algorithm = getKeyAlgorithm(alg);
	const cryptoKey = await importPublicKey(publicKey, algorithm);
	return await crypto.subtle.verify(algorithm, cryptoKey, signature, data);
}
function pemToBinary(pem) {
	return decodeBase64(pem.replace(/-+(BEGIN|END).*?-+/g, "").replace(/\s/g, ""));
}
async function importPrivateKey(key, alg) {
	if (!crypto.subtle || !crypto.subtle.importKey) throw new Error("`crypto.subtle.importKey` is undefined. JWT auth middleware requires it.");
	if (isCryptoKey(key)) {
		if (key.type !== "private" && key.type !== "secret") throw new Error(`unexpected key type: CryptoKey.type is ${key.type}, expected private or secret`);
		return key;
	}
	const usages = ["sign"];
	if (typeof key === "object") return await crypto.subtle.importKey("jwk", key, alg, false, usages);
	if (key.includes("PRIVATE")) return await crypto.subtle.importKey("pkcs8", pemToBinary(key), alg, false, usages);
	return await crypto.subtle.importKey("raw", utf8Encoder.encode(key), alg, false, usages);
}
async function importPublicKey(key, alg) {
	if (!crypto.subtle || !crypto.subtle.importKey) throw new Error("`crypto.subtle.importKey` is undefined. JWT auth middleware requires it.");
	if (isCryptoKey(key)) {
		if (key.type === "public" || key.type === "secret") return key;
		key = await exportPublicJwkFrom(key);
	}
	if (typeof key === "string" && key.includes("PRIVATE")) key = await exportPublicJwkFrom(await crypto.subtle.importKey("pkcs8", pemToBinary(key), alg, true, ["sign"]));
	const usages = ["verify"];
	if (typeof key === "object") return await crypto.subtle.importKey("jwk", key, alg, false, usages);
	if (key.includes("PUBLIC")) return await crypto.subtle.importKey("spki", pemToBinary(key), alg, false, usages);
	return await crypto.subtle.importKey("raw", utf8Encoder.encode(key), alg, false, usages);
}
async function exportPublicJwkFrom(privateKey) {
	if (privateKey.type !== "private") throw new Error(`unexpected key type: ${privateKey.type}`);
	if (!privateKey.extractable) throw new Error("unexpected private key is unextractable");
	const jwk = await crypto.subtle.exportKey("jwk", privateKey);
	const { kty } = jwk;
	const { alg, e, n } = jwk;
	const { crv, x, y } = jwk;
	return {
		kty,
		alg,
		e,
		n,
		crv,
		x,
		y,
		key_ops: ["verify"]
	};
}
function getKeyAlgorithm(name) {
	switch (name) {
		case "HS256": return {
			name: "HMAC",
			hash: { name: "SHA-256" }
		};
		case "HS384": return {
			name: "HMAC",
			hash: { name: "SHA-384" }
		};
		case "HS512": return {
			name: "HMAC",
			hash: { name: "SHA-512" }
		};
		case "RS256": return {
			name: "RSASSA-PKCS1-v1_5",
			hash: { name: "SHA-256" }
		};
		case "RS384": return {
			name: "RSASSA-PKCS1-v1_5",
			hash: { name: "SHA-384" }
		};
		case "RS512": return {
			name: "RSASSA-PKCS1-v1_5",
			hash: { name: "SHA-512" }
		};
		case "PS256": return {
			name: "RSA-PSS",
			hash: { name: "SHA-256" },
			saltLength: 32
		};
		case "PS384": return {
			name: "RSA-PSS",
			hash: { name: "SHA-384" },
			saltLength: 48
		};
		case "PS512": return {
			name: "RSA-PSS",
			hash: { name: "SHA-512" },
			saltLength: 64
		};
		case "ES256": return {
			name: "ECDSA",
			hash: { name: "SHA-256" },
			namedCurve: "P-256"
		};
		case "ES384": return {
			name: "ECDSA",
			hash: { name: "SHA-384" },
			namedCurve: "P-384"
		};
		case "ES512": return {
			name: "ECDSA",
			hash: { name: "SHA-512" },
			namedCurve: "P-521"
		};
		case "EdDSA": return {
			name: "Ed25519",
			namedCurve: "Ed25519"
		};
		default: throw new JwtAlgorithmNotImplemented(name);
	}
}
function isCryptoKey(key) {
	if (getRuntimeKey() === "node" && !!crypto.webcrypto) return key instanceof crypto.webcrypto.CryptoKey;
	return key instanceof CryptoKey;
}
//#endregion
export { signing, verifying };