@defra-fish/dynamics-lib/src/client/dynamics-client.js

Framework to support integration with dynamics

import DynamicsWebApi from 'dynamics-web-api'
import SimpleOAuth2 from 'simple-oauth2'
const PREEMPTIVE_TOKEN_EXPIRY_SECONDS = 60

export function config () {
  const oauthClient = new SimpleOAuth2.ClientCredentials({
    client: {
      id: process.env.OAUTH_CLIENT_ID,
      secret: process.env.OAUTH_CLIENT_SECRET
    },
    auth: {
      tokenHost: process.env.OAUTH_AUTHORITY_HOST_URL,
      tokenPath: `${process.env.OAUTH_TENANT}/oauth2/v2.0/token`,
      authorizePath: `${process.env.OAUTH_TENANT}/oauth2/v2.0/authorize`
    },
    options: {
      authorizationMethod: 'body',
      bodyFormat: 'form'
    }
  })

  let accessToken = null
  return {
    webApiUrl: process.env.DYNAMICS_API_PATH,
    webApiVersion: process.env.DYNAMICS_API_VERSION,
    timeout: process.env.DYNAMICS_API_TIMEOUT || 90000,
    onTokenRefresh: async dynamicsWebApiCallback => {
      if (!accessToken || accessToken.expired(PREEMPTIVE_TOKEN_EXPIRY_SECONDS)) {
        accessToken = await oauthClient.getToken({ scope: process.env.OAUTH_SCOPE })
      }
      dynamicsWebApiCallback(accessToken.token.access_token)
    }
  }
}

export const dynamicsClient = new DynamicsWebApi(config())