@triplit/authjs-adapter

authjs-adapter

Official Triplit adapter for Auth.js / NextAuth.js.

Installation

npm install @triplit/authjs-adapter

TriplitAdapter()

TriplitAdapter(server, token, options)

Setup

Configure Auth.js

Add this adapter to your `pages/api/[...nextauth].js`` next-auth configuration object.

import NextAuth from "next-auth"
import { TriplitAdapter } from "@triplit/authjs-adapter"
import { schema } from "path/to/triplit/schema"

// For more information on each option (and a full list of options) go to
// https://authjs.dev/reference/core#authconfig
export default NextAuth({
  // https://authjs.dev/reference/core/providers
  providers: [...],
  adapter: TriplitAdapter({
    server: process.env.TRIPLIT_DB_URL,
    token: process.env.TRIPLIT_SERVICE_TOKEN,
    schema: schema
  }),
  // ...
})

Setup the NextAuth schema

Add the following schema to your Triplit database. The schema is described here.

In your triplit/schema.ts file, add the following collections:

{
    users: {
        schema: S.Schema({
            id: S.Id(),
            name: S.String({ nullable: true, default: null }),
            email: S.String({ nullable: true, default: null }),
            emailVerified: S.Date({ nullable: true, default: null }),
            image: S.String({ nullable: true, default: null }),
        }),
    },
    accounts: {
        schema: S.Schema({
            id: S.Id(),
            userId: S.String(),
            type: S.String(),
            provider: S.String(),
            providerAccountId: S.String(),
            refresh_token: S.String({ nullable: true, default: null }),
            access_token: S.String({ nullable: true, default: null }),
            expires_at: S.Number({ nullable: true, default: null }),
            token_type: S.String({ nullable: true, default: null }),
            scope: S.String({ nullable: true, default: null }),
            id_token: S.String({ nullable: true, default: null }),
            session_state: S.String({ nullable: true, default: null }),
        }),
        relationships: {
            user: S.RelationById("users", "$1.userId")
        }
    },
    sessions: {
        schema: S.Schema({
            id: S.Id(),
            userId: S.String(),
            expires: S.Date(),
            sessionToken: S.String(),
        }),
        relationships: {
            user: S.RelationById("users", "$1.userId")
        }
    },
    verificationTokens: {
        schema: S.Schema({
            id: S.Id(),
            identifier: S.String(),
            token: S.String(),
            expires: S.Date(),
        }),
    },
}

In local development, the Auth.js models should be available for use.

Managing user JWTs

Configure Auth.js to use JWTs and assign them proper fields.

To sign the JWT, install the jose package:

npm install jose

Using Auth.js callbacks, create a valid token and append it to the session object.

import NextAuth from "next-auth"
import { TriplitAdapter } from "@auth/triplit-adapter"
import * as jwt from "jose"

// For more information on each option (and a full list of options) go to
// https://authjs.dev/reference/configuration/auth-options
export default NextAuth({
    // https://authjs.dev/reference/core/providers
 providers: [...],
  adapter: TriplitAdapter({...}),
  session: {
    strategy: "jwt" as const,
  },
  jwt: {
    secret: process.env.NEXTAUTH_SECRET,
    encode: async ({ secret, token, maxAge }) => {
      return await signToken(token, secret);
    },
    decode: async ({ secret, token }) => {
      return await decodeToken(token!, secret)
    },
  },
  callbacks: {
    jwt: async ({ token, user }) => {
      if (user) {
        token["x-triplit-user-id"] = user.id
      }
      return token
    },
    async session({ session, token, user }) {
      if (process.env.NEXTAUTH_SECRET) {
        session.token = await signToken(token, process.env.NEXTAUTH_SECRET)
      }
      return session
    },
    async authorized({ request, auth }) {
      return !!auth
    },
  },
  // ...
});

async function signToken(token: any, secret: string) {
  const alg = "HS256"
  const secretKey = new TextEncoder().encode(secret)
  const encodedToken = await new jwt.SignJWT(token)
    .setIssuedAt()
    .setExpirationTime("24h")
    .setProtectedHeader({ alg })
    .sign(secretKey)
  return encodedToken
}

async function decodeToken(token: string, secret: string) {
  const secretKey = new TextEncoder().encode(secret)
  const decodedToken = await jwt.jwtVerify(token, secretKey, {
    algorithms: ["HS256"],
  })
  return decodedToken.payload
}

Example

Check out Triplit's example chat app for a full example.