Dart

Initiate Resumable Upload Session

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Initiate a Google Cloud Storage resumable upload session.. Dart

import 'package:chilkat/chilkat.dart';

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

  final http = CkHttp();

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

  final jsonMetaData = CkJsonObject();
  jsonMetaData.updateString('contentType', 'image/jpeg');

  // Adds the "Authorization: Bearer <access_token>" header..
  http.authToken = jsonToken.stringOf('access_token');

  http.setUrlVar('bucket_name', 'chilkat-bucket-b');
  http.setUrlVar('object_name', 'penguins2.jpg');
  final url = 'https://storage.googleapis.com/upload/storage/v1/b/{\$bucket_name}/o?uploadType=resumable&name={\$object_name}';
  final resp = CkHttpResponse();
  try {
    http.httpJson('POST', url, jsonMetaData, 'application/json', resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final statusCode = resp.statusCode;
  print('response status code = $statusCode');

  var sessionUrl = '';

  if (statusCode != 200) {
    print(resp.bodyStr);
  } else {
    // The session URL will be used to upload the file in chunks, in subsequent HTTP POSTs...
    sessionUrl = resp.getHeaderField('Location');
    print('Session URL = $sessionUrl');
  }
}