fire_sso_1.js

import * as functions from 'firebase-functions'
import * as service from './service.json'
import admin = require('firebase-admin')

const params = {
	type: service.type,
	projectId: service.project_id,
	privateKeyId: service.private_key_id,
	privateKey: service.private_key,
	clientEmail: service.client_email,
	clientId: service.client_id,
	authUri: service.auth_uri,
	tokenUri: service.token_uri,
	authProviderX509CertUrl: service.auth_provider_x509_cert_url,
	clientC509CertUrl: service.client_x509_cert_url,
}

admin.initializeApp({
	credential: admin.credential.cert(params),
	databaseURL: 'https://yourprojecturl.firebaseio.com',
})

export const getUserToken = functions.https.onCall(async (data) => {
	try {
		let res = await admin.auth().createCustomToken(data.uid)
		return { error: false, data: res }
	} catch (error) {
		return { error: true, data: error }
	}
})