npm package: @sanpuru/prisma-session-store
Description: Prisma express-session store
Author: Krispin Leydon
Latest version: 1.1.0

# prisma-session-store

An [express](https://github.com/expressjs) session store implementation, for the [Prisma (2) Framework](https://github.com/prisma).

Want the flexibility and scalability of a Prisma GraphQL data layer, along with the optionality and maturity of the Express ecosystem - but concerned about [JWT](https://jwt.io) or [Paseto](https://paseto.io) tokens for session management (see cautions posted [here](https://paragonie.com/blog/2017/03/jwt-json-web-tokens-is-bad-standard-that-everyone-should-avoid), [here](http://cryto.net/%7Ejoepie91/blog/2016/06/19/stop-using-jwt-for-sessions-part-2-why-your-solution-doesnt-work/), [here](https://techblog.bozho.net/using-jwt-sessions/), [here](https://news.ycombinator.com/item?id=17877332), and [here](https://developer.okta.com/blog/2017/08/17/why-jwts-suck-as-session-tokens))?

`prisma-session-store` simplifies access to tried-and-true express session management via Prisma's database client.

Based on: [memorystore](https://github.com/roccomuso/memorystore), by [roccomuso](https://github.com/roccomuso)

## Usage

### JavaScript (CommonJS)

```js

const expressSession = require('express-session')
const PrismaSessionStore = require('@quixo3/prisma-session-store')(expressSession)

...

app.use(
  session({
    cookie: {
     maxAge: 7 * 24 * 60 * 60 * 1000 // ms
    },
    secret: 'a santa at nasa',
    store: new PrismaSessionStore(
      prisma,
      {
        checkPeriod: 2 * 60 * 1000,  //ms
        dbRecordIdIsSessionId: true,
        dbRecordIdFunction: null,
      }
    )
  })
)

...

```

### TypeScript

```ts
import expressSession from 'express-session';
import prismaSessionStore from '@quixo3/prisma-session-store';

const PrismaSessionStore = prismaSessionStore(expressSession);

...

app.use(
  session({
    cookie: {
     maxAge: 7 * 24 * 60 * 60 * 1000 // ms
    },
    secret: 'a santa at nasa',
    store: new PrismaSessionStore(
      prisma,
      {
        checkPeriod: 2 * 60 * 1000,  //ms
        dbRecordIdIsSessionId: true,
        dbRecordIdFunction: null,
      }
    )
  })
)

...
```

## Setup

### Install

Install `@quixo3/prisma-session-store` (and `express-session`, if not already installed):

#### NPM

`$ npm install @quixo3/prisma-session-store express-session`

#### yarn

`$ yarn add @quixo3/prisma-session-store express-session`

### Prisma

#### Model

From your **prisma.schema** file, include a session model:

```prisma
model Session {
  id        String   @id
  sid       String   @unique
  data      String
  expires   DateTime
}
```

Don't forget to run `prisma generate` to generate your PrismaClient.

#### GraphQL Nexus

If you are using [@nexus/schema](https://www.npmjs.com/package/@nexus/schema) you can define your Session type:

```js
...

{
  name: 'Session',
  definition(t) {
    t.model.id();
    t.model.sid();
    t.model.data();
    t.model.expires();
  }
}
...

```

#### Database

If you are using Prisma's migrations you can simply run `prisma migrate save` and `prisma migrate up` to migrate your database.
If you are using something other then `prisma` then you will need to manage the migrations yourself and you check the [Prisma Documentation](https://www.prisma.io/docs/getting-started/setup-prisma/start-from-scratch-sql-typescript-postgres#create-database-tables-with-sql) on the subject if you need help.

## Options

- `dbRecordIdIsSessionId` A flag indicating to use the session ID as the Prisma Record ID

- `dbRecordIdFunction` A function to generate the Prisma Record ID for a given session ID

Note: If both dbRecordIdFunction and dbRecordIdIsSessionId are undefined then a random
CUID will be used instead.

- `checkPeriod` Interval, in ms, at which PrismaSessionStore will automatically remove expired sessions. Disabled by default; set to something reasonable.

- `ttl` "Time to live", in ms; defines session expiration time. Defaults to session.maxAge (if set), or one day (if not set). May alternatively be set to a function, of the form `(options, session, sessionID) => number`.

- `dispose` Called on sessions when they are dropped. Handy if you want to close file descriptors or do other cleanup tasks when sessions are no longer accessible. Called with `key, value`. It's called _before_ actually removing the item from the internal cache, so if you want to immediately put it back in, you'll have to do that in a `nextTick` or `setTimeout` callback or it won't do anything.

- `stale` By default, if you set a `maxAge`, it'll only actually pull stale items out of the cache when you `get(key)`. (That is, it's not pre-emptively doing a `setTimeout` or anything.) If you set `stale:true`, it'll return the stale value before deleting it. If you don't set this, then it'll return `undefined` when you try to get a stale entry, as if it had already been deleted.

- `noDisposeOnSet` By default, if you set a `dispose()` method, then it'll be called whenever a `set()` operation overwrites an existing key. If you set this option, `dispose()` will only be called when a key falls out of the cache, not when it is overwritten.

- `serializer` An object containing `stringify` and `parse` methods compatible with Javascript's `JSON` to override the serializer used.

Two new options were added apart from the work that was already done by [memorystore](https://github.com/roccomuso/memorystore), they both relate to logging and allow you to inject your own logger object giving you flexibility to log outputs to something like NestJS or where ever you would like even saving them to disk if that's what you want.

- `logger` Where logs should be outputted to, by default `console`. If set to `false` then logging will be disabled

- `loggerLevel` Determines which logging methods to enable, by default `error` only

## Methods

`prisma-session-store` implements all the **required**, **recommended** and **optional** methods of the [express-session](https://github.com/expressjs/session#session-store-implementation) store, plus a few more:

- `startInterval()` and `stopInterval()` methods to start/clear the automatic check for expired.
- `prune()` that you can use to manually remove only the expired entries from the store.
- `shutdown()` that can be used to stop any intervals and disconnect from prisma.

## Author

Krispin Leydon ([kleydon](https://github.com/kleydon)), based heavily on [memorystore](https://github.com/roccomuso/memorystore), by [roccomuso](https://github.com/roccomuso), refactored to TypeScript by [wSedlacek](https://github.com/wSedlacek)

## License

MIT

TEST