Keystone class

This is the last active development release of this package as Keystone 5 is now in a 6 to 12 month active maintenance phase. For more information please read our Keystone 5 and beyond post.

Usage

const { Keystone } = require('@keystonejs/keystone');

const keystone = new Keystone({
  adapter,
  appVersion,
  cookie,
  cookieSecret,
  defaultAccess,
  onConnect,
  queryLimits,
  sessionStore,
  schemaNames,
});

appVersion

Configure the application version, which can be surfaced via HTTP headers or GraphQL.

The version can be any string value you choose to use for your system. If addVersionToHttpHeaders is true then all requests will have the header X-Keystone-App-Version set. The version can also be queried from the GraphQL API as { appVersion }. You can control whether this is exposed in your schema using access, which can be either a boolean, or an object with schemaName keys and boolean values.

const keystone = new Keystone({
  appVersion: {
    version: '1.0.0',
    addVersionToHttpHeaders: true,
    access: true,
  },
});

Why don't we just use access to control the HTTP header?

We want to attach the HTTP header at the very top of the middleware stack, so if something gets rejected we can at least be sure of the system version that did the rejecting. This happens well before we have worked out which schema the person is trying to access, and therefore our access control isn’t ready to be used. Also, the access control that we set up is all about controlling access to the GraphQL API, and HTTP headers are a Different Thing, so even if it was technically possible to use the same mechanism, it really makes sense to decouple those two things.

cookie

Default: see Usage.

A description of the cookie properties is included in the express-session documentation.

secure

A secure cookie is only sent to the server with an encrypted request over the HTTPS protocol. If secure is set to true (as is the default with a production build) for a KeystoneJS project running on a non-HTTPS server (such as localhost), you will not be able to log in. In that case, be sure you set secure to false. This does not affect development builds since this value is already false.

You can read more about secure cookies on the MDN web docs.

Usage

const keystone = new Keystone({
  /* ...config */
  cookie: {
    secure: process.env.NODE_ENV === 'production', // Default to true in production
    maxAge: 1000 * 60 * 60 * 24 * 30, // 30 days
    sameSite: false,
  },
});

cookieSecret

The secret used to sign session ID cookies. In production mode (process.env.NODE_ENV === 'production') this option is required. In development mode, if undefined, a random cookieSecret will be generated each time Keystone starts (this will cause sessions to be reset between restarts).

defaultAccess

Default:

{
  list: true,
  field: true,
  custom: true
}

Default list and field access. See the Access Control page for more details.

onConnect

Default: undefined

Callback function that executes once keystone.connect() is complete. Takes no arguments.

queryLimits

Configures global query limits.

These should be used together with list query limits.

const keystone = new Keystone({
  queryLimits: {
    maxTotalResults: 1000,
  },
});

• maxTotalResults: limit of the total results of all relationship subqueries

Note that maxTotalResults applies to the total results of all relationship queries separately, even if some are nested inside others.

sessionStore

Sets the Express server's session middleware. This should be configured before deploying your app.

This example uses the connect-mongo middleware, but you can use any of the stores that work with express session.

const expressSession = require('express-session');
const MongoStore = require('connect-mongo')(expressSession);

const keystone = new Keystone({
  sessionStore: new MongoStore({ url: 'mongodb://localhost/my-app' }),
});

schemaNames

Default: ['public']

Methods

connect()

Manually connect Keystone to the adapter. See Custom Server.

keystone.connect();

Note: keystone.connect() is only required for custom servers. Most example projects use the keystone start command to start a server and automatically connect.

createAuthStrategy(config)

Creates a new authentication middleware instance. See:

• Authentication guide
• Authentication API docs

const authStrategy = keystone.createAuthStrategy({...});

createList(listKey, config)

Registers a new list with Keystone and returns a Keystone list object. See:

• Adding lists tutorial
• Data modelling guide

keystone.createList('Posts', {...});

Config

disconnect()

Disconnect the adapter.

extendGraphQLSchema(config)

Extends keystones generated schema with custom types, queries, and mutations.

keystone.extendGraphQLSchema({
  types: [{ type: 'type MyType { original: Int, double: Float }' }],
  queries: [
    {
      schema: 'double(x: Int): MyType',
      resolver: (_, { x }) => ({ original: x, double: 2.0 * x }),
    },
  ],
  mutations: [
    {
      schema: 'triple(x: Int): Int',
      resolver: (_, { x }) => 3 * x,
    },
  ],
});

See the Custom schema guide for more information on utilizing custom schema.

Config

• The schema for both queries and mutations should be a string defining the GraphQL schema element for the query/mutation, e.g.

{
  schema: 'getBestPosts(author: ID!): [Post]',
}

• The resolver for both queries and mutations should be a resolver function with following signature:

{
  resolver: (parent, args, context, info, extra) => {},
}

For more information about the first four arguments, please see the Apollo docs. The last argument extra is an object that contains the following property:

• The access argument for types, queries, and mutations are all either boolean values which are used at schema generation time to include or exclude the item from the schema, or a function which must return boolean.
• See the Access control API docs for more details.

prepare(config)

Manually prepare middlewares. Returns a promise representing the processed middlewares. They are available as an array through the middlewares property of the returned object.

Usage

const { middlewares } = await keystone.prepare({
  apps,
  dev: process.env.NODE_ENV !== 'production',
});

Config

createContext({ schemaName, authentication, skipAccessControl })

Create a context object that can be used with executeGraphQL().

Usage

const { gql } = require('apollo-server-express');

// Create a context which can execute GraphQL operations with no access control
const context = keystone.createContext().sudo()

// Execute a GraphQL operation with no access control
const { data, errors } = await keystone.executeGraphQL({ context, query: gql` ... `, variables: { ... }})

Config

executeGraphQL({ context, query, variables })

Execute a server-side GraphQL query within the given context.

Usage

const { gql } = require('apollo-server-express');

// Create a context which can execute GraphQL operations with no access control
const context = keystone.createContext().sudo()

// Execute a GraphQL operation with no access control
const { data, errors } = await keystone.executeGraphQL({ context, query: gql` ... `, variables: { ... }})

Config