Why?

Well, if you often check your public ip address (for example, various plugins for the desktop), then public api usually have a limit on the request interval and can completely ban you for frequent use of the service.

⚠️ Default Firebase functions plan propose only 125k requests per month, this is about one request every 21 seconds.

Setup

There are two options for the function: with public access and access via token:

• Install the Firebase CLI and log in:

npm install -g firebase-tools
firebase login

• Create Firebase project via CLI or browser:

firebase projects:create

⚠️ Don't forget change name in .firebaserc, or just create project with name public-ip-function.

⚠️ Function use deprecated Node.js 8 runtime, but Node.js >10 runtime for now requires Blaze plan. So, if you use not default Firebase plan, just change "node" property in functions/package.json

• Deploy function:

  • Public function:

  firebase deploy --only functions:publicFunctions
  

  • Auth function:

  firebase deploy --only functions:authFunctions
  

• Now you can access via link, like this (or just look for it in Firebase Console):

  • Public function:

  https://us-central1-MY_PROJECT.cloudfunctions.net/getPublicIp
  

  • Auth function:

  https://us-central1-MY_PROJECT.cloudfunctions.net/getPublicIpWithAuth?auth=USER_UID
  

  Create user in Develop > Authentication > Users > Add User and use his User UID as access token.