How to access tokens that are defined in the App Settings?

[alamenai]

Hi everyone,

My manager asked me to define the tokens in the App Settings ( environment variables ), however I could not access them because the sentry.client.config is reserved for client component and the token should be start with NEXT_PUBLIC but because I'm using Docker, NEXT_PUBLIC environment can not changed during the runtime.

I would create NextJS action, access this key and assign it to the dsn key.

env.ts (NextJS Action):

"use server"

export const getEnv = async () => {
  return process.env.DOCKER_SENTRY_TOKEN
}

sentry.config.client

// This file configures the initialization of Sentry on the client.
// The config you add here will be used whenever a users loads a page in their browser.
// https://docs.sentry.io/platforms/javascript/guides/nextjs/
import * as Sentry from "@sentry/nextjs"
import { getEnv } from "env"

let val

const feedbackIntegration = Sentry.feedbackIntegration({
  // Additional SDK configuration goes in here, for example:
  colorScheme: "light",
  isNameRequired: true,
  isEmailRequired: true,
  nameLabel: "Ihr Name",
  emailPlaceholder: "Geben sie ihre E-Mail Adresse ein",
  isRequiredLabel: "(erforderlich)",
  namePlaceholder: "Gib deinen Namen ein",
  showBranding: false,
  formTitle: "Ein Problem melden",
  messageLabel: "Beschreibung",
  messagePlaceholder: "Was ist das Problem? Was haben Sie erwartet?",
  submitButtonLabel: "Problembericht senden",
  cancelButtonLabel: "Stornieren",
  buttonLabel: "Melde Probleme",
  successMessageText: "Vielen Dank für deinen Bericht!",
})

Sentry.init({
  dsn: getEnv(),

  // Adjust this value in production, or use tracesSampler for greater control
  tracesSampleRate: 1,

  // Setting this option to true will print useful information to the console while you're setting up Sentry.
  debug: false,

  replaysOnErrorSampleRate: 1.0,

  // This sets the sample rate to be 10%. You may want this to be 100% while
  // In development and sample at a lower rate in production
  replaysSessionSampleRate: 0.1,

  // You can remove this option if you're not planning to use the Sentry Session Replay feature:
  integrations: [
    new Sentry.Replay({
      // Additional Replay configuration goes in here, for example:
      maskAllText: true,
      blockAllMedia: true,
    }),
    feedbackIntegration,
  ],
})


![image](https://github.com/getsentry/sentry-javascript/assets/20143684/5dfabec8-a06a-48d2-9b1b-86669447548e)