MEGA FS wrapper for Apps Script

MEGA-FS.js

// The returns a object similar to the returned by DriveApp.getFolderById(id):
function getFolder_(id) {
  var parts = id.split('!');
  if (parts.length === 2 || id.length === 8) {
    var result = UrlFetchApp.fetch('https://eu.api.mega.co.nz/cs?n=' + parts[0], {
      method: 'POST',
      contentType: 'application/json;charset=UTF-8',
      payload: '[{"a":"f","c":1,"r":1}]'
    });
    
    var jsonResult = JSON.parse(result.getContentText());
    var files = jsonResult[0]['f'].filter(function (file) {
      return file.k && file.t === 0;
    });
    var key = parts[1];
    
    if (files.length === 0) {
      throw Error('Empty folder');
    }
    
    // Recreate Google Drive API for MEGA:
    return {
      // Come on, that's complicated:
      getFiles: function () {
        var index = 0;
        return {
          hasNext: function () {
            return index < files.length;
          },
          next: function () {
            var fileIndex = index++
            var file = files[fileIndex];
            
            function processFileInfo() {
              file.url = 'https://mega.nz/#F!' + id;
              if (key) {
                // getMegaFileName is defined by this file
                // https://gist.github.com/qgustavor/9b9af6c8baa8693720a8
                file.name = getMegaFileName(file, key);
                file.url += '!' + file.name.replace(/\s/g, '_');
              } else {
                file.name = '[encrypted name: ' + (fileIndex + 1) + ']';
              }
            }
            
            return {
              getName: function () {
                if (!file.name) {
                  processFileInfo();
                }
                return file.name;
              },
              getLastUpdated: function () {
                return file.ts * 1000;
              },
              getUrl: function () {
                if (!file.url) {
                  processFileInfo();
                }
                return file.url;
              }
            }
          }
        };
      }
    };
  } else {
    throw Error ('Invalid ID');
  }
}