Convert MS Word file to Google Drive format.

convert.dart

import 'dart:async';
import 'dart:io';

import 'package:http/http.dart' show Client;
import 'package:googleapis_auth/auth_io.dart' as auth;
import 'package:googleapis/common/common.dart' show Media, DownloadOptions;
import 'package:googleapis/drive/v2.dart' as drive;
import 'package:path/path.dart' as path;

Future convertFile(drive.DriveApi api, 
                    Client client, 
                    String objectId) {
  var completer = new Completer();
  api.files.get(objectId).then((drive.File file) {
    var fileName = path.basenameWithoutExtension(file.title);
    var parents = file.parents;

    client.readBytes(file.downloadUrl).then((bytes) {
      var driveFile = new drive.File()
      ..title = fileName
      ..mimeType = 'application/vnd.google-apps.document'
      ..parents = parents;
      api.files.insert(driveFile)
      .then((driveFile){
        var byteList = bytes.toList();
        var stream = new Stream.fromIterable([byteList]);
        var media = new Media(stream, byteList.length);
        api.files.update(new drive.File(), driveFile.id, uploadMedia: media)
        .then((drive.File f){
          api.files.delete(objectId)
          .then((_){
            completer.complete(true);
            print("Converted ${f.id}");
          });
        });
      });
    });
  });
  return completer.future;
}