import * as NodeCrypto from "node:crypto"; import { assert, describe, it } from "@effect/vitest";import * as Option from "effect/Option"; import {  computeDpopAccessTokenHash,  computeDpopJwkThumbprint,  normalizeDpopHtu,  normalizeDpopHtuOption,  type DpopPublicJwk,  type DpopVerificationResult,  verifyDpopProof,} from "./dpop.ts"; function signDpopProof(input: {  readonly method: string;  readonly url: string;  readonly iat: number;  readonly privateKey: NodeCrypto.KeyObject;  readonly publicJwk: DpopPublicJwk | (DpopPublicJwk & { readonly d: string });  readonly accessToken?: string;}) {  const header = Buffer.from(    JSON.stringify({      typ: "dpop+jwt",      alg: "ES256",      jwk: input.publicJwk,    }),  ).toString("base64url");  const payload = Buffer.from(    JSON.stringify({      htm: input.method,      htu: input.url,      jti: "proof-1",      iat: input.iat,      ...(input.accessToken ? { ath: computeDpopAccessTokenHash(input.accessToken) } : {}),    }),  ).toString("base64url");  const signature = NodeCrypto.sign("sha256", Buffer.from(`${header}.${payload}`), {    key: input.privateKey,    dsaEncoding: "ieee-p1363",  }).toString("base64url");  return `${header}.${payload}.${signature}`;} type DpopRejectedResult = Extract<DpopVerificationResult, { readonly ok: false }>; function assertAccepted(result: DpopVerificationResult) {  if (!result.ok) {    assert.fail(`Expected accepted DPoP proof, got ${result.error._tag}`);  }  return result;} function assertRejected(result: DpopVerificationResult, tag: DpopRejectedResult["error"]["_tag"]) {  if (result.ok) {    assert.fail("Expected rejected DPoP proof.");  }  assert.equal(result.error._tag, tag);  assert.equal(result.reason, result.error.message);  return result;} describe("verifyDpopProof", () => {  const { privateKey, publicKey } = NodeCrypto.generateKeyPairSync("ec", {    namedCurve: "P-256",  });  const publicJwk = publicKey.export({ format: "jwk" }) as DpopPublicJwk;  const proof = signDpopProof({    method: "POST",    url: "https://example.com/oauth/token",    iat: 100,    privateKey,    publicJwk,  });   it("verifies an ES256 DPoP proof and returns the RFC 7638 thumbprint", () => {    const thumbprint = computeDpopJwkThumbprint(publicJwk);    const result = assertAccepted(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/oauth/token",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }),    );    assert.equal(result.thumbprint, thumbprint);    assert.equal(result.jti, "proof-1");  });   it("rejects method, URL, thumbprint, and time-window mismatches", () => {    const thumbprint = computeDpopJwkThumbprint(publicJwk);    assertRejected(      verifyDpopProof({        proof,        method: "GET",        url: "https://example.com/oauth/token",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }),      "DpopMethodMismatchError",    );    assertRejected(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/other",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }),      "DpopUrlMismatchError",    );    assertRejected(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/oauth/token",        nowEpochSeconds: 101,        expectedThumbprint: "other-thumbprint",      }),      "DpopThumbprintMismatchError",    );    assertRejected(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/oauth/token",        nowEpochSeconds: 1_000,        expectedThumbprint: thumbprint,      }),      "DpopTimeWindowError",    );  });   it("requires the RFC 9449 access token hash when an access token is expected", () => {    const thumbprint = computeDpopJwkThumbprint(publicJwk);    const accessTokenProof = signDpopProof({      method: "POST",      url: "https://example.com/v1/environments/env/connect",      iat: 100,      privateKey,      publicJwk,      accessToken: "clerk-access-token",    });     assertAccepted(      verifyDpopProof({        proof: accessTokenProof,        method: "POST",        url: "https://example.com/v1/environments/env/connect",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,        expectedAccessToken: "clerk-access-token",      }),    );    assertRejected(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/oauth/token",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,        expectedAccessToken: "clerk-access-token",      }),      "DpopAccessTokenHashMismatchError",    );    assertRejected(      verifyDpopProof({        proof: accessTokenProof,        method: "POST",        url: "https://example.com/v1/environments/env/connect",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,        expectedAccessToken: "other-access-token",      }),      "DpopAccessTokenHashMismatchError",    );  });   it("normalizes htu by excluding query and fragment components per RFC 9449", () => {    assert.equal(      normalizeDpopHtu("https://example.com/v1/environments/env/connect?foo=bar#frag"),      "https://example.com/v1/environments/env/connect",    );    assert.deepStrictEqual(      normalizeDpopHtuOption("https://example.com/v1/environments/env/connect?foo=bar#frag"),      Option.some("https://example.com/v1/environments/env/connect"),    );    assert.deepStrictEqual(normalizeDpopHtuOption("not a url"), Option.none());     const thumbprint = computeDpopJwkThumbprint(publicJwk);    const queryProof = signDpopProof({      method: "POST",      url: "https://example.com/v1/environments/env/connect",      iat: 100,      privateKey,      publicJwk,    });     assertAccepted(      verifyDpopProof({        proof: queryProof,        method: "POST",        url: "https://example.com/v1/environments/env/connect?foo=bar#frag",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }),    );  });   it("rejects DPoP public JWK headers that expose private key material", () => {    const thumbprint = computeDpopJwkThumbprint(publicJwk);    const privateJwk = privateKey.export({ format: "jwk" }) as DpopPublicJwk & {      readonly d: string;    };    const proofWithPrivateJwk = signDpopProof({      method: "POST",      url: "https://example.com/oauth/token",      iat: 100,      privateKey,      publicJwk: privateJwk,    });     assertRejected(      verifyDpopProof({        proof: proofWithPrivateJwk,        method: "POST",        url: "https://example.com/oauth/token",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }),      "InvalidDpopJwtHeaderError",    );  });});