commit ceef6ff07d709526e2a88f59600eca7c22155fea · gmstn.systems/shard

+47 -2

src/lib/sessions.ts

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       import type { WebSocket } from "ws";

     

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       import * as crypto from "node:crypto";

     

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       import { SESSIONS_SECRET } from "@/lib/utils/crypto";

     

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       import z from "zod";

     

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       export const sessionInfoSchema = z.object({

     

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           id: z.string(),

     

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           token: z.string(),

     

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           fingerprint: z.string(),

     

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       });

     

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       export type SessionInfo = z.infer<typeof sessionInfoSchema>;

     

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       export type Session = Map<string, WebSocket>;

     

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           return crypto.randomUUID();

     

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       };

     

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       export const assignSessionTo = (socket: WebSocket) => {

     

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       export const generateSessionInfo = (sessionId: string): SessionInfo => {

     

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           const token = crypto.randomBytes(32).toString("base64url");

     

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           const hmac = crypto.createHmac("sha256", SESSIONS_SECRET);

     

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           hmac.update(`${token}:${sessionId}`);

     

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           const fingerprint = hmac.digest("hex");

     

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           return { id: sessionId, token, fingerprint };

     

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       };

     

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       export const verifySessionToken = ({

     

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           token,

     

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           fingerprint,

     

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           id: sessionId,

     

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       }: SessionInfo) => {

     

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           const hmac = crypto.createHmac("sha256", SESSIONS_SECRET);

     

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           hmac.update(`${token}:${sessionId}`);

     

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           const expectedFingerprint = hmac.digest("hex");

     

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           try {

     

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               const sessionId = generateSessionId();

     

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               return crypto.timingSafeEqual(

     

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                   Buffer.from(fingerprint, "hex"),

     

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                   Buffer.from(expectedFingerprint, "hex"),

     

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               );

     

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           } catch {

     

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               return false;

     

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           }

     

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       };

     

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       export const assignSessionTo = ({

     

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           sessionInfo,

     

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           socket,

     

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       }: {

     

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           sessionInfo: SessionInfo;

     

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           socket: WebSocket;

     

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       }) => {

     

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           try {

     

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               const sessionId = sessionInfo.id;

     

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               sessions.set(sessionId, socket);

     

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               return { ok: true };

     

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           } catch (err: unknown) {

+2 -1

src/lib/types/http/responses.ts

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       import { sessionInfoSchema } from "@/lib/sessions";

     

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       import { httpResponseErrorInfoSchema } from "@/lib/types/http/errors";

     

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       import { z } from "zod";

     

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···

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       >;

     

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       export const handshakeResponseSchema = z.object({

     

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           shardToken: z.string(),

     

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           sessionInfo: sessionInfoSchema,

     

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       });

     

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       export type HandshakeResponse = z.infer<typeof handshakeResponseSchema>;

     

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src/lib/utils/crypto.ts

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       import * as crypto from "node:crypto";

     

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       export const generateNewSecret = () => {

     

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           return crypto.randomBytes(32).toString("hex");

     

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       };

     

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       export const SESSIONS_SECRET = generateNewSecret();