@adobe/reactor-uploader/bin/getExtensionPackageManifest.js

/***************************************************************************************
 * (c) 2017 Adobe. All rights reserved.
 * This file is licensed to you 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 REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 ****************************************************************************************/

const yauzl = require('yauzl');

module.exports = (zipPath) => {
  return new Promise((resolve, reject) => {
    yauzl.open(zipPath, { lazyEntries: true }, (error, zipFile) => {
      if (error) {
        reject(new Error(`Error inspecting zip file for extension info. ${error}`));
        return;
      }

      zipFile.readEntry();
      zipFile.on('entry', (entry) => {
        if (entry.fileName === 'extension.json') {
          zipFile.openReadStream(entry, (err, readStream) => {
            const chunks = [];

            readStream.on('data', chunk => chunks.push(chunk));
            readStream.on('end', () => {
              const manifest = JSON.parse(Buffer.concat(chunks).toString());
              resolve(manifest);
              zipFile.close();
            });
          });
        } else {
          zipFile.readEntry();
        }
      });
      zipFile.on('end', () => {
        reject(new Error('No extension.json found within the extension package zip file.'));
      });
      zipFile.on('error', (error) => {
        reject(new Error(`Error inspecting zip file for extension info. ${error}`));
      });
    });
  })
};