npm package: @mgcrea/fastify-session
Description: Session plugin for fastify written in TypeScript supporting both stateless and stateful sessions
Author: Olivier Louvignes
Latest version: 2.4.1

# FastifySession

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## Features

Session plugin for [fastify](https://github.com/fastify/fastify) that supports both stateless and sateful sessions.

- Requires [@fastify/cookie](https://github.com/fastify/fastify-cookie) to handle cookies.

- Works with [fastify](https://github.com/fastify/fastify) `>=4.0.0`.

- Can leverage crypto addons like
  [@mgcrea/fastify-session-sodium-crypto](https://github.com/mgcrea/fastify-session-sodium-crypto) to perform crypto.

- Can leverage store addons like:

  - [@mgcrea/fastify-session-redis-store](https://github.com/mgcrea/fastify-session-redis-store)
  - [@mgcrea/fastify-session-prisma-store](https://github.com/mgcrea/fastify-session-prisma-store)
  - [fastify-session-sqlite-store](https://github.com/oof2win2/fastify-session-sqlite-store)

- Built with [TypeScript](https://www.typescriptlang.org/) for static type checking with exported types along the
  library.

## Install

```bash
npm install @mgcrea/fastify-session @fastify/cookie
# or
pnpm add @mgcrea/fastify-session @fastify/cookie
```

## Quickstart

### Basic example (signed session with hmac stored in a volatile in-memory store)

Defaults to a volatile in-memory store for sessions (great for tests), with
[hmac](https://nodejs.org/api/crypto.html#crypto_crypto_createhmac_algorithm_key_options) for signature.

```ts
import createFastify, { FastifyInstance, FastifyServerOptions } from "fastify";
import fastifyCookie from "@fastify/cookie";
import fastifySession from "@mgcrea/fastify-session";

const SESSION_SECRET = "a secret with minimum length of 32 characters";
const SESSION_TTL = 86400; // 1 day in seconds

export const buildFastify = (options?: FastifyServerOptions): FastifyInstance => {
  const fastify = createFastify(options);

  fastify.register(fastifyCookie);
  fastify.register(fastifySession, {
    secret: SESSION_SECRET,
    cookie: { maxAge: SESSION_TTL },
  });

  return fastify;
};
```

### Production example (signed session with sodium stored in redis)

For better performance/security, you can use the
[@mgcrea/fastify-session-sodium-crypto](https://github.com/mgcrea/fastify-session-sodium-crypto) addon:

Leveraging an external redis store, the session id (generated with [nanoid](https://github.com/ai/nanoid)) is signed
using a secret-key with
[libsodium's crytpo_auth](https://libsodium.gitbook.io/doc/secret-key_cryptography/secret-key_authentication)

```ts
import createFastify, { FastifyInstance, FastifyServerOptions } from 'fastify';
import fastifyCookie from 'fastify-cookie';
import fastifySession from '@mgcrea/fastify-session';
import { SODIUM_AUTH } from '@mgcrea/fastify-session-sodium-crypto';

const SESSION_KEY = 'Egb/g4RUumlD2YhWYfeDlm5MddajSjGEBhm0OW+yo9s='';
const SESSION_TTL = 86400; // 1 day in seconds
const REDIS_URI = process.env.REDIS_URI || 'redis://localhost:6379/1';

export const buildFastify = (options?: FastifyServerOptions): FastifyInstance => {
  const fastify = createFastify(options);

  fastify.register(fastifyCookie);
  fastify.register(fastifySession, {
    key: Buffer.from(SESSION_KEY, 'base64'),
    crypto: SODIUM_AUTH,
    store: new RedisStore({ client: new Redis(REDIS_URI), ttl: SESSION_TTL }),
    cookie: { maxAge: SESSION_TTL },
  });

  return fastify;
};
```

### Stateless example (encrypted session with sodium not using a store)

No external store required, the entire session data is encrypted using a secret-key with
[libsodium's crypto_secretbox_easy](https://libsodium.gitbook.io/doc/secret-key_cryptography/secretbox)

Here we used a `secret` instead of providing a `key`, key derivation will happen automatically on startup.

```ts
import createFastify, { FastifyInstance, FastifyServerOptions } from "fastify";
import fastifyCookie from "fastify-cookie";
import fastifySession from "@mgcrea/fastify-session";
import { SODIUM_SECRETBOX } from "@mgcrea/fastify-session-sodium-crypto";

const SESSION_TTL = 86400; // 1 day in seconds

export const buildFastify = (options?: FastifyServerOptions): FastifyInstance => {
  const fastify = createFastify(options);

  fastify.register(fastifyCookie);
  fastify.register(fastifySession, {
    secret: "a secret with minimum length of 32 characters",
    crypto: SODIUM_SECRETBOX,
    cookie: { maxAge: SESSION_TTL },
  });

  return fastify;
};
```

## Benchmarks

### Session crypto sealing

```sh
node --experimental-specifier-resolution=node --loader=ts-paths-esm-loader/transpile-only --no-warnings test/benchmark/cryptoSeal.ts
```

```txt
SODIUM_SECRETBOX#sealJson x 333,747 ops/sec ±0.62% (91 runs sampled)
SODIUM_AUTH#sealJson x 376,300 ops/sec ±0.50% (89 runs sampled)
HMAC#sealJson x 264,292 ops/sec ±3.13% (85 runs sampled)
Fastest is SODIUM_AUTH#sealJson
```

### Session crypto unsealing

```sh
node --experimental-specifier-resolution=node --loader=ts-paths-esm-loader/transpile-only --no-warnings test/benchmark/cryptoUnseal.ts
```

```txt
SODIUM_SECRETBOX#unsealJson x 424,297 ops/sec ±0.69% (86 runs sampled)
SODIUM_AUTH#unsealJson x 314,736 ops/sec ±0.96% (89 runs sampled)
HMAC#unsealJson x 145,037 ops/sec ±5.67% (78 runs sampled)
Fastest is SODIUM_SECRETBOX#unsealJson
```

## Authors

- [Olivier Louvignes](https://github.com/mgcrea) <<olivier@mgcrea.io>>

### Credits

Heavily inspired from

- [fastify-secure-session](https://github.com/fastify/fastify-secure-session) by
  [Matteo Collina](https://github.com/mcollina)
- [fastify-session](https://github.com/SerayaEryn/fastify-session) by [Denis Fäcke](https://github.com/SerayaEryn)
- [express-session](https://github.com/expressjs/session) by [Douglas Wilson](https://github.com/dougwilson)
- [cookie-signature](https://github.com/tj/node-cookie-signature) by [TJ Holowaychuk](https://github.com/tj)

## License

```md
The MIT License

Copyright (c) 2020 Olivier Louvignes <olivier@mgcrea.io>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
```