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A downstream fork of Tranquil PDS for use in margin.cafe
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111import * as secp from "@noble/secp256k1";import { base58btc } from "multiformats/bases/base58";
const SECP256K1_MULTICODEC_PREFIX = new Uint8Array([0xe7, 0x01]);
export interface Keypair { privateKey: Uint8Array; publicKey: Uint8Array; publicKeyMultibase: string; publicKeyDidKey: string;}
export function generateKeypair(): Keypair { const privateKey = secp.utils.randomSecretKey(); const publicKey = secp.getPublicKey(privateKey, true);
const multicodecKey = new Uint8Array( SECP256K1_MULTICODEC_PREFIX.length + publicKey.length, ); multicodecKey.set(SECP256K1_MULTICODEC_PREFIX, 0); multicodecKey.set(publicKey, SECP256K1_MULTICODEC_PREFIX.length);
const publicKeyMultibase = base58btc.encode(multicodecKey); const publicKeyDidKey = `did:key:${publicKeyMultibase}`;
return { privateKey, publicKey, publicKeyMultibase, publicKeyDidKey, };}
function base64UrlEncode(data: Uint8Array | string): string { const bytes = typeof data === "string" ? new TextEncoder().encode(data) : data; const binary = Array.from(bytes, (byte) => String.fromCharCode(byte)).join( "", ); return btoa(binary).replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "");}
export async function createServiceJwt( privateKey: Uint8Array, issuerDid: string, audienceDid: string, lxm: string,): Promise<string> { const header = { alg: "ES256K", typ: "JWT", };
const now = Math.floor(Date.now() / 1000); const payload = { iss: issuerDid, sub: issuerDid, aud: audienceDid, exp: now + 180, iat: now, lxm: lxm, };
const headerEncoded = base64UrlEncode(JSON.stringify(header)); const payloadEncoded = base64UrlEncode(JSON.stringify(payload)); const message = `${headerEncoded}.${payloadEncoded}`;
const msgBytes = new TextEncoder().encode(message); const hashBuffer = await crypto.subtle.digest("SHA-256", msgBytes); const msgHash = new Uint8Array(hashBuffer); const sigBytes = await secp.signAsync(msgHash, privateKey, { prehash: false, }); const signatureEncoded = base64UrlEncode(sigBytes);
return `${message}.${signatureEncoded}`;}
export function generateDidDocument( did: string, publicKeyMultibase: string, handle: string, pdsEndpoint: string,): object { return { "@context": [ "https://www.w3.org/ns/did/v1", "https://w3id.org/security/multikey/v1", "https://w3id.org/security/suites/secp256k1-2019/v1", ], id: did, alsoKnownAs: [`at://${handle}`], verificationMethod: [ { id: `${did}#atproto`, type: "Multikey", controller: did, publicKeyMultibase: publicKeyMultibase, }, ], service: [ { id: "#atproto_pds", type: "AtprotoPersonalDataServer", serviceEndpoint: pdsEndpoint, }, ], };}