parse-kmz/index.js

Parse KMZ Files

module.exports = (function() {
  const fs = require('fs');
  const request = require('request');
  const togeojson = require('togeojson');
  const unzip2 = require('unzip2');
  const xmldom = new (require('xmldom')).DOMParser();

  /**
   *
   * @param {string} path
   *
   * @returns { string }
   */
  const toKML = path => {
    return new Promise((resolve, reject) => {
      if (path.indexOf('http') === 0) {
        request(path)
          .pipe(unzip2.Parse())
          .on('entry', function(entry) {
            if (entry.path.indexOf('.kml') === -1) {
              entry.autodrain();
              return;
            }
            let data = '';

            entry.on('error', reject);

            entry.on('data', function(chunk) {
              data += chunk;
            });

            entry.on('end', function() {
              resolve(data);
            });
          })
          .on('error', reject);
      } else {
        fs.createReadStream(path)
          .pipe(unzip2.Parse())
          .on('entry', function(entry) {
            if (entry.path.indexOf('.kml') === -1) {
              entry.autodrain();
              return;
            }
            let data = '';

            entry.on('error', reject);

            entry.on('data', function(chunk) {
              data += chunk;
            });

            entry.on('end', function() {
              resolve(data);
            });
          })
          .on('error', reject);
      }
    });
  };

  /**
   *
   * @param {string} path
   *
   * @returns { Object }
   */
  const toJson = path => {
    return new Promise((resolve, reject) => {
      toKML(path)
        .then(res => xmldom.parseFromString(res))
        .then(res => togeojson.kml(res))
        .then(resolve)
        .catch(reject);
    });
  };

  return {
    toKML,
    toJson,
  };
})();