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,  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}`;} 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 = verifyDpopProof({      proof,      method: "POST",      url: "https://example.com/oauth/token",      nowEpochSeconds: 101,      expectedThumbprint: thumbprint,    });    assert.isTrue(result.ok);    if (result.ok) {      assert.equal(result.thumbprint, thumbprint);      assert.equal(result.jti, "proof-1");    }  });   it("rejects method, URL, thumbprint, and time-window mismatches", () => {    const thumbprint = computeDpopJwkThumbprint(publicJwk);    assert.isFalse(      verifyDpopProof({        proof,        method: "GET",        url: "https://example.com/oauth/token",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }).ok,    );    assert.isFalse(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/other",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }).ok,    );    assert.isFalse(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/oauth/token",        nowEpochSeconds: 101,        expectedThumbprint: "other-thumbprint",      }).ok,    );    assert.isFalse(      verifyDpopProof({        proof,        method: "POST",        url: "https://example.com/oauth/token",        nowEpochSeconds: 1_000,        expectedThumbprint: thumbprint,      }).ok,    );  });   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",    });     assert.isTrue(      verifyDpopProof({        proof: accessTokenProof,        method: "POST",        url: "https://example.com/v1/environments/env/connect",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,        expectedAccessToken: "clerk-access-token",      }).ok,    );    const missingAth = verifyDpopProof({      proof,      method: "POST",      url: "https://example.com/oauth/token",      nowEpochSeconds: 101,      expectedThumbprint: thumbprint,      expectedAccessToken: "clerk-access-token",    });    assert.isFalse(missingAth.ok);    if (!missingAth.ok) {      assert.equal(missingAth.reason, "DPoP access token hash mismatch.");    }    const mismatchedAth = verifyDpopProof({      proof: accessTokenProof,      method: "POST",      url: "https://example.com/v1/environments/env/connect",      nowEpochSeconds: 101,      expectedThumbprint: thumbprint,      expectedAccessToken: "other-access-token",    });    assert.isFalse(mismatchedAth.ok);    if (!mismatchedAth.ok) {      assert.equal(mismatchedAth.reason, "DPoP access token hash mismatch.");    }  });   it("normalizes htu by excluding query and fragment components per RFC 9449", () => {    const normalized = normalizeDpopHtuOption(      "https://example.com/v1/environments/env/connect?foo=bar#frag",    );    assert.isTrue(Option.isSome(normalized));    assert.equal(Option.getOrThrow(normalized), "https://example.com/v1/environments/env/connect");    assert.equal(      normalizeDpopHtu("https://example.com/v1/environments/env/connect?foo=bar#frag"),      "https://example.com/v1/environments/env/connect",    );     const thumbprint = computeDpopJwkThumbprint(publicJwk);    const queryProof = signDpopProof({      method: "POST",      url: "https://example.com/v1/environments/env/connect",      iat: 100,      privateKey,      publicJwk,    });     assert.isTrue(      verifyDpopProof({        proof: queryProof,        method: "POST",        url: "https://example.com/v1/environments/env/connect?foo=bar#frag",        nowEpochSeconds: 101,        expectedThumbprint: thumbprint,      }).ok,    );  });   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,    });     const result = verifyDpopProof({      proof: proofWithPrivateJwk,      method: "POST",      url: "https://example.com/oauth/token",      nowEpochSeconds: 101,      expectedThumbprint: thumbprint,    });    assert.isFalse(result.ok);    if (!result.ok) {      assert.equal(result.reason, "Invalid DPoP JWT header.");    }  });});