index.js

/**
 * Copyright 2017 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';

const functions = require('firebase-functions');
const BitlyClient = require('bitly');
// TODO: Make sure to set the bitly.access_token cloud functions config using the CLI.
const bitly = BitlyClient(functions.config().bitly.access_token);

// Shorten URL written to /links/{linkID}.
exports.shortenUrl = functions.database.ref('/links/{linkID}').onCreate((snap) => {
  const originalUrl = snap.val();
  return bitly.shorten(originalUrl).then((response) => {
    return snap.ref.set({
      original: originalUrl,
      short: response.data.url,
    })
  });
});