Dart

Upload File to Google Cloud Storage

See more Google Cloud Storage Examples

Demonstrates how to upload a file 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"

  final jsonToken = CkJsonObject();
  try {
    jsonToken.loadFile('qa_data/tokens/googleCloudStorage.json');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // 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();
  http.authToken = jsonToken.stringOf('access_token');

  final sbPath = CkStringBuilder();
  sbPath.append('/upload/storage/v1/b/bucket_name/o?uploadType=media&name=object_name');
  var numReplaced = sbPath.replace('bucket_name', 'chilkat-bucket-b');
  numReplaced = sbPath.replace('object_name', 'penguins.jpg');

  final req = CkHttpRequest();
  req.httpVerb = 'POST';
  req.path = sbPath.getAsString();
  req.contentType = 'image/jpeg';
  // Indicate the file to be streamed in the request body when the HTTP POST is sent.
  req.streamBodyFromFile('qa_data/jpg/penguins.jpg');

  final resp = CkHttpResponse();
  try {
    http.httpSReq('www.googleapis.com', 443, true, req, 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/penguins.jpg/1502643657837855",
  //  "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/penguins.jpg",
  //  "name": "penguins.jpg",
  //  "bucket": "chilkat-ocean",
  //  "generation": "1502643657837855",
  //  "metageneration": "1",
  //  "contentType": "image/jpeg",
  //  "timeCreated": "2017-08-13T17:00:57.811Z",
  //  "updated": "2017-08-13T17:00:57.811Z",
  //  "storageClass": "MULTI_REGIONAL",
  //  "timeStorageClassUpdated": "2017-08-13T17:00:57.811Z",
  //  "size": "777835",
  //  "md5Hash": "nTd7EM53jEk4s8fixjoimg==",
  //  "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/penguins.jpg?generation=1502643657837855&alt=media",
  //  "crc32c": "ixxYVw==",
  //  "etag": "CJ+azOvX1NUCEAE="
  // }
}