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Added HTTPSignature service
ref https://linear.app/tryghost/issue/MOM-72 This module handles signing and validating HTTP signatures, which is a core part of interfacing with ActivityPub enabled servers.
This commit is contained in:
Fabien O'Carroll
Fabien 'egg' O'Carroll
parent
f34c33f330
commit
deb6e05889
@ -0,0 +1,53 @@
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import assert from 'assert';
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import {HTTPSignature} from './http-signature.service';
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describe('HTTPSignature', function () {
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describe('#validate', function () {
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it('returns true when the signature is valid', async function () {
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const requestMethod = 'POST';
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const requestUrl = '/activitypub/inbox/deadbeefdeadbeefdeadbeef';
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const requestHeaders = new Headers({
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host: 'a424-171-97-56-187.ngrok-free.app',
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'user-agent': 'http.rb/5.2.0 (Mastodon/4.3.0-nightly.2024-04-30; +https://mastodon.social/)',
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'content-length': '286',
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'accept-encoding': 'gzip',
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'content-type': 'application/activity+json',
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date: 'Thu, 02 May 2024 09:51:57 GMT',
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digest: 'SHA-256=tbr1NMXoLisaWc4LplxkUO19vrpGSjslPpHN5qGMEaU=',
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signature: 'keyId="https://mastodon.social/users/testingshtuff#main-key",algorithm="rsa-sha256",headers="(request-target) host date digest content-type",signature="rbkHYjeJ6WpO5Pa6Ui3Z/9GzOeB4c/3IMKlXH+ZrBwtAy7DGannGzHXBe+sYWlLOS9U18IQvOcHvsnWkKMs6f63Fbk9kIylxoSOwZqlkWekI5/dfAhEnlz6azW0X3psiW6I/nAqTdAmWYTqszfQVRD19TwgsQXNsPVD/lEfbsopANCGALePY7mPhmf/ukGluy7Ck4sskwDn6eCqoSHSXi7Mav6ZEp5OABX9C626CyvRG5U/IWE2AVjc8hwGghp7NUgxSLiMKk/Tt3xKFd39dDMDJwj8NinCZQTBmvcZurdzChH2ShDsETxZDvPTFrj30jeH2g29kxZhq5rqHP7a6Gw=="',
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'x-forwarded-for': '49.13.137.65',
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'x-forwarded-host': 'a424-171-97-56-187.ngrok-free.app',
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'x-forwarded-proto': 'https'
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});
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const requestBody = Buffer.from('eyJAY29udGV4dCI6Imh0dHBzOi8vd3d3LnczLm9yZy9ucy9hY3Rpdml0eXN0cmVhbXMiLCJpZCI6Imh0dHBzOi8vbWFzdG9kb24uc29jaWFsLzgzMWNlOWMyLWNkYWYtNGJhMC05NmUyLWE3MzY5NDk3MmI5OSIsInR5cGUiOiJGb2xsb3ciLCJhY3RvciI6Imh0dHBzOi8vbWFzdG9kb24uc29jaWFsL3VzZXJzL3Rlc3RpbmdzaHR1ZmYiLCJvYmplY3QiOiJodHRwczovL2E0MjQtMTcxLTk3LTU2LTE4Ny5uZ3Jvay1mcmVlLmFwcC9hY3Rpdml0eXB1Yi9hY3Rvci9kZWFkYmVlZmRlYWRiZWVmZGVhZGJlZWYifQ==', 'base64');
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const actual = await HTTPSignature.validate(requestMethod, requestUrl, requestHeaders, requestBody);
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const expected = true;
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assert.equal(actual, expected, 'The signature should have been validated');
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});
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it('also returns true when the signature is valid', async function () {
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const requestMethod = 'POST';
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const requestUrl = '/activitypub/inbox/deadbeefdeadbeefdeadbeef';
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const requestHeaders = new Headers({
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host: 'a424-171-97-56-187.ngrok-free.app',
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'user-agent': 'http.rb/5.2.0 (Mastodon/4.3.0-nightly.2024-04-30; +https://mastodon.social/)',
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'content-length': '438',
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'accept-encoding': 'gzip',
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'content-type': 'application/activity+json',
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date: 'Thu, 02 May 2024 09:51:30 GMT',
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digest: 'SHA-256=Bru67GlP+0N3ySTtv/D8/QfhCaBc2P9vC1AjCxl5gmA=',
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signature: 'keyId="https://mastodon.social/users/testingshtuff#main-key",algorithm="rsa-sha256",headers="(request-target) host date digest content-type",signature="qx5uo2gRN447a1B+yzjFyc5zy/lYCZqC8tJnIe2Tn6Q+vvVLRZL5hUoZQhFzwlxMPpcpibz2EoFdGlNBf/OFuNBoKa+dsjRA9JyCyc0fd/W2adoA+cp/y1smgSpLFjZUrIViG/SfnVBa3JTw+YeeqX4yY27WYiDMw1hSiQYGWbb64kwayChP6povH5MyoqkjyS1QZWYxOmbn27hlcGuqHgqhEEQhDeqwVEOPzq+JrkuosfIxCPTw/oLX0SWITGUwIffXFquOIV8oB1pWkqfbIXjstrMfFq5n48Ee/5vadsj3rR/dDFLMbUUAwO7uKTsvfurcWmzM4fJKoLyAOxzAgQ=="',
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'x-forwarded-for': '78.47.65.118',
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'x-forwarded-host': 'a424-171-97-56-187.ngrok-free.app',
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'x-forwarded-proto': 'https'
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});
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const requestBody = Buffer.from('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', 'base64');
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const actual = await HTTPSignature.validate(requestMethod, requestUrl, requestHeaders, requestBody);
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const expected = true;
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assert.equal(actual, expected, 'The signature should have been validated');
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});
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});
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});
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193
ghost/ghost/src/core/activitypub/http-signature.service.ts
Normal file
193
ghost/ghost/src/core/activitypub/http-signature.service.ts
Normal file
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import crypto from 'node:crypto';
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type Signature = {
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signature: Buffer
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headers: string[]
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keyId: URL
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algorithm: string
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};
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export class HTTPSignature {
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private static generateSignatureString(
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signature: Signature,
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headers: Headers,
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requestMethod: string,
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requestUrl: string
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): string {
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const data = signature.headers
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.map((header) => {
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return `${header}: ${this.getHeader(
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header,
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headers,
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requestMethod,
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requestUrl
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)}`;
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})
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.join('\n');
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return data;
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}
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private static parseSignatureHeader(signature: string): Signature {
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const signatureData: Record<string, string> = signature
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.split(',')
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.reduce((data, str) => {
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try {
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const [key, value] = str.split('=');
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return {
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// values are wrapped in quotes like key="the value"
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[key]: value.replace(/"/g, ''),
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...data
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};
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} catch (err) {
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return data;
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}
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}, {});
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if (
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!signatureData.signature ||
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!signatureData.headers ||
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!signatureData.keyId ||
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!signatureData.algorithm
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) {
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throw new Error('Could not parse signature');
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}
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return {
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keyId: new URL(signatureData.keyId),
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headers: signatureData.headers.split(/\s/),
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signature: Buffer.from(signatureData.signature, 'base64url'),
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algorithm: signatureData.algorithm
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};
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}
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private static getHeader(
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header: string,
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headers: Headers,
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requestMethod: string,
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requestUrl: string
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) {
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if (header === '(request-target)') {
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return `${requestMethod.toLowerCase()} ${requestUrl}`;
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}
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if (!headers.has(header)) {
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throw new Error(`Missing Header ${header}`);
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}
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return headers.get(header);
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}
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protected static async getPublicKey(keyId: URL): Promise<crypto.KeyObject> {
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try {
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const keyRes = await fetch(keyId, {
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headers: {
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Accept: 'application/ld+json'
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}
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});
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// This whole thing is wrapped in try/catch so we can just cast as we want and not worry about errors
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const json = (await keyRes.json()) as {
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publicKey: { publicKeyPem: string };
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};
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const key = crypto.createPublicKey(json.publicKey.publicKeyPem);
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return key;
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} catch (err) {
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throw new Error(`Could not find public key ${keyId.href}: ${err}`);
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}
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}
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private static validateDigest(
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signatureData: Signature,
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requestBody: Buffer,
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requestHeaders: Headers
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) {
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const digest = crypto
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.createHash(signatureData.algorithm)
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.update(requestBody)
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.digest('base64');
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const remoteDigest = requestHeaders.get('digest')?.split('SHA-256=')[1];
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return digest === remoteDigest;
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}
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static async validate(
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requestMethod: string,
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requestUrl: string,
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requestHeaders: Headers,
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requestBody: Buffer = Buffer.alloc(0, 0)
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) {
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const signatureHeader = requestHeaders.get('signature');
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if (typeof signatureHeader !== 'string') {
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throw new Error('Invalid Signature header');
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}
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const signatureData = this.parseSignatureHeader(signatureHeader);
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if (requestMethod.toLowerCase() === 'post') {
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const digestIsValid = this.validateDigest(
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signatureData,
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requestBody,
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requestHeaders
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);
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if (!digestIsValid) {
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return false;
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}
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}
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const publicKey = await this.getPublicKey(signatureData.keyId);
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const signatureString = this.generateSignatureString(
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signatureData,
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requestHeaders,
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requestMethod,
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requestUrl
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);
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const verified = crypto
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.createVerify(signatureData.algorithm)
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.update(signatureString)
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.verify(publicKey, signatureData.signature);
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return verified;
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}
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static async sign(
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request: Request,
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keyId: URL,
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privateKey: crypto.KeyObject
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): Promise<Request> {
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let headers;
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if (request.method.toLowerCase() === 'post') {
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headers = ['(request-target)', 'host', 'date', 'digest'];
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} else {
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headers = ['(request-target)', 'host', 'date'];
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}
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const signatureData: Signature = {
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signature: Buffer.alloc(0, 0),
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headers,
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keyId,
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algorithm: 'rsa-sha256'
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};
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const url = new URL(request.url);
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const signatureString = this.generateSignatureString(
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signatureData,
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request.headers,
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request.method,
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url.pathname
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);
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const signature = crypto
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.createSign(signatureData.algorithm)
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.update(signatureString)
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.sign(privateKey)
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.toString('base64');
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const newHeaders = new Headers(request.headers);
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newHeaders.set(
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'Signature',
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`keyId="${keyId}",headers="${headers.join(' ')}",signature="${signature}",algorithm="${signatureData.algorithm}"`
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);
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return new Request(request, {
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headers: newHeaders
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});
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}
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}
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