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secure path for serviceAccountKey.json for a Firebase project in Google App Engine Node.js app – Facebook api

I have a Firebase project that users share some content with consists of media and text. For Facebook to handle links properly shared content must have a pre-populated page (dynamically created on the server-side, not on the client with Firebase JS API).

So, I have decided to use Google App Engine (GAE) to serve these content as an URL like somedomain.com/?content=hfe84gfjy45xs

var admin = require("firebase-admin");

// Fetch the service account key JSON file contents
var serviceAccount = require("path/to/serviceAccountKey.json");

// Initialize the app with a null auth variable, limiting the server's access
admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: "https://databaseName.firebaseio.com",
  databaseAuthVariableOverride: null
});

Is it safe to put path/to/serviceAccountKey.json file in project folder?
Do i have to put the file to a Google Cloud Storage instance?

Thanks in advance.

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2

Answers


  1. 0

    express-firebase has a good example of accomplishing this.

    1. Add your serviceAccountKey.json to your project BUT reference that file path in your .gitignore so it is not checked into source control.

    2. Create a .env variable that is the path to your serviceAccountKey.json as so:

      FIREBASE_SERVICE_ACCOUNT_KEY_PATH=./service-account-key.json

      See dotenv for loading environments variables in JS apps.

    3. From there, you can simply reference your service account file like so and pass it to the cert function:

      const serviceAccount = require(process.env.FIREBASE_SERVICE_ACCOUNT_KEY_PATH);

admin.credential.cert(serviceAccount)
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  2. 0

    Just extract the these three values from the JSON file and put it in the .env file

    credential: admin.credential.cert({
    projectId: PROJECT_ID,
    clientEmail: CLIENT_EMAIL,
    privateKey: FIREBASE_PRIVATE_KEY,
}),
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