Dart Requires Chilkat v11.0.0+

Upload In-Memory Binary Data to Google Cloud Storage

See more Google Cloud Storage Examples

Demonstrates how to upload in-memory binary data to Google Cloud Storage. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // This example uses a previously obtained access token having permission for the 
  // scope "https://www.googleapis.com/auth/cloud-platform"

  // In this example, Get Google Cloud Storage OAuth2 Access Token, 
  // the service account access token was saved to a text file.  This example fetches the access token from the file..
  final sbToken = CkStringBuilder();
  sbToken.loadFile('qa_data/tokens/googleCloudStorageAccessToken.txt', 'utf-8');

  // Send a POST equivalent to this curl command.
  // The content of the file is contained in the request body.

  // curl -X POST --data-binary @[OBJECT] \
  //     -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  //     -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
  //     "https://www.googleapis.com/upload/storage/v1/b/[BUCKET_NAME]/o?uploadType=media&name=[OBJECT_NAME]"

  final http = CkHttp();

  // Download a JPG image from the Internet, and then upload this JPG to
  // a Google Storage bucket.
  final jpgUrl = 'https://www.chilkatsoft.com/images/starfish.jpg';

  final jpgData = CkBinData();
  try {
    http.downloadBd(jpgUrl, jpgData);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  http.authToken = sbToken.getAsString();

  // Construct a URL to upload to an object named "starfish.jpg" in the "chilkat-ocean" bucket.
  http.setUrlVar('bucket_name', 'chilkat-ocean');
  http.setUrlVar('object_name', 'starfish.jpg');
  final url = 'https://www.googleapis.com/upload/storage/v1/b/{\$bucket_name}/o?uploadType=media&name={\$object_name}';

  final resp = CkHttpResponse();
  try {
    http.httpBd('POST', url, jpgData, 'image/jpeg', resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final responseCode = resp.statusCode;
  if (responseCode == 401) {
    print(resp.bodyStr);
    print('If invalid credentials, then it is likely the access token expired.');
    print('Your app should automatically fetch a new access token and re-try.');
    return;
  }

  print('Response code: $responseCode');
  print('Response body');
  print(resp.bodyStr);

  // A successful response looks like this:
  // Response code: 200
  // Response body
  // {
  //  "kind": "storage#object",
  //  "id": "chilkat-ocean/starfish.jpg/1502670320090292",
  //  "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg",
  //  "name": "starfish.jpg",
  //  "bucket": "chilkat-ocean",
  //  "generation": "1502670320090292",
  //  "metageneration": "1",
  //  "contentType": "image/jpeg",
  //  "timeCreated": "2017-08-14T00:25:20.040Z",
  //  "updated": "2017-08-14T00:25:20.040Z",
  //  "storageClass": "MULTI_REGIONAL",
  //  "timeStorageClassUpdated": "2017-08-14T00:25:20.040Z",
  //  "size": "6229",
  //  "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
  //  "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/starfish.jpg?generation=1502670320090292&alt=media",
  //  "crc32c": "9RjgwQ==",
  //  "etag": "CLT5kpW71dUCEAE="
  // }
}