fastify-oidc-provider/index.js

Fastify plugin for oidc-provider

'use strict'

const fp = require('fastify-plugin')
const { Provider } = require('oidc-provider')

const isObjectLiteral = (x) => x?.constructor?.name === 'Object'

async function plugin(fastify, options) {
  if (!isObjectLiteral(options)) {
    throw new Error('Expected options to be an object literal')
  }

  let issuer

  try {
    issuer = new URL(options.issuer).href
  } catch {
    throw new Error('Expected options.issuer to be a URL')
  }

  if (!isObjectLiteral(options.setup)) {
    throw new Error('Expected options.setup to be an object literal')
  }

  const customGrants = [].concat(options.customGrants || []).filter(Boolean)
  const validCustomGrants = customGrants && customGrants.every(isObjectLiteral)

  if (!validCustomGrants) {
    throw new Error(
      'Expected options.customGrants to be an object literal or array of object literals'
    )
  }

  const provider = new Provider(issuer, options.setup)

  customGrants.forEach(
    ({
      grantType,
      tokenExchangeHandler,
      parameters,
      allowedDuplicateParameters
    }) => {
      provider.registerGrantType(
        grantType,
        tokenExchangeHandler,
        parameters,
        allowedDuplicateParameters
      )
    }
  )

  const interactionDetails = (req, reply) => {
    return provider.interactionDetails(req.raw, reply.raw)
  }

  const interactionFinished = (req, reply, result, options) => {
    return provider.interactionFinished(req.raw, reply.raw, result, options)
  }

  const interactionResult = (req, reply, result, options) => {
    return provider.interactionResult(req.raw, reply.raw, result, options)
  }

  fastify.decorate('oidcProvider', {
    interactionDetails,
    interactionFinished,
    interactionResult
  })
}

module.exports = fp(plugin, {
  fastify: '3.x',
  name: 'fastify-oidc-provider'
})