zip files and folders using node-archiver.js

zip files and folders using node-archiver.js

/*
 Pre-requisite: npm --save archiver
 
 Suppose the folder `/Users/x/baseFolder` has the following structure: 
 /Users/x/baseFolder
 | __ dir1
   | __ file1.txt 
   | __ file2.txt
 | __ dir2
   | __ file3.txt
   | __ file4.txt
 | __ dir3
   | __ file5.txt
   | __ file6.txt
   | __ file7.txt
 | __ file8.txt
 | __ file9.txt
 | __ file10.txt
 
 The code below creates a result.zip file using some of the contents from the folder. The contents in the output file preserves the same folder structure as the source folder, i.e. :
 /Users/x/baseFolder/result.zip
 | __ dir1
   | __ file1.txt 
 | __ dir2
   | __ file3.txt
   | __ file4.txt
 | __ dir3
   | __ file6.txt
   | __ file7.txt
 | __ file8.txt
 | __ file9.txt
 
*/

var fs = require('fs');
var path = require('path');
var archiver = require("archiver");

function zipFolder(baseFolder) {
  var archive = archiver('zip'); // a new archive instance is needed for each run of the archive
  var fileNames = [
    'dir1/file1.txt',
    'dir3/file6.txt',
    'dir3/file7.txt',
    'file8.txt',
    'file9.txt'
  ];
  var folderNames = [
    'dir2',
  ]

  var output = fs.createWriteStream(path.join(baseFolder, "result.zip"));

  output.on('close', function () {
    console.log(archive.pointer() + ' total bytes');
    console.log('archiver has been finalized and the output file descriptor has closed.');
  });

  archive.on('error', function (err) {
    throw err;
  });

  archive.pipe(output);

  for (i = 0; i < fileNames.length; i++) {
    var stream = fs.readFileSync(path.join(baseFolder, fileNames[i]));
    archive.append(stream, { name: fileNames[i] });
  }
  for (i = 0; i < folderNames.length; i++) {
    archive.directory(path.join(baseFolder, folderNames[i]), folderNames[i]);
  }

  archive.finalize(function (err, bytes) {
    if (err) throw err;
  });
}