base64.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 fs = require('fs');
const path = require('path');

const ls = (start) => {
  return new Promise((resolve, reject) => {
    fs.readdir(start, (err, files) => {
      if (err) {
        return reject(err);
      }
      // Don't return hidden files
      files = files.filter((name) => !/^\./.test(name));
      return resolve(files.map((file) => path.join(start, file)));
    });
  });
};

const base64 = {
  encodeAssets() {
    let files = [];
    return ls(path.join(__dirname, 'public', 'images'))
    .then((files_) => {
      files = files_;
      return Promise.all(
        files.map((file) => fs.readFileSync(file).toString('base64'))
      );
    })
    .then((encoded) => {
      const results = {};
      files.forEach((file, i) => {
        results[file] = encoded[i];
      });
      return results;
    });
  },
};

module.exports = base64;