lib/google.js

// Copyright (c) 2017, Matt Godbolt
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
const https = require('https'),
    API_BASE = 'https://www.googleapis.com/urlshortener/v1/url';

class ShortLinkResolver {
    constructor(apiKey) {
        this.apiKey = apiKey;
    }

    resolve(url) {
        const googleApiUrl = `${API_BASE}?shortUrl=${url}&key=${this.apiKey}`;
        return new Promise((resolve, reject) => {
            https.get(googleApiUrl, (response) => {
                let responseText = '';
                response.on('data', d => responseText += d);
                response.on('end', () => {
                    if (response.statusCode !== 200) {
                        reject(`Got response ${response.statusCode} : ${responseText}`);
                        return;
                    }
                    const resultObj = JSON.parse(responseText);
                    if (!resultObj.longUrl) {
                        reject(`Missing longUrl in ${responseText}`);
                        return;
                    }
                    resolve(resultObj);
                });
            })
                .on('error', e => {
                    reject(e.message);
                });
        });
    }
}

module.exports.ShortLinkResolver = ShortLinkResolver;