Dart

Google Cloud Storage List Bucket Objects

See more Google Cloud Storage Examples

List the objects in a Google Cloud Storage bucket. 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');

  final http = CkHttp();
  http.authToken = sbToken.getAsString();

  // For more info see Cloud Storage Documentation - Objects: list 
  // 
  http.setUrlVar('bucket', 'chilkat-ocean');
  http.setUrlVar('PROJECT_NAME', 'ChilkatCloud');

  final resp = CkHttpResponse();
  try {
    http.httpNoBody('GET', 'https://www.googleapis.com/storage/v1/b/{\$bucket}/o?project={\$ChilkatCloud}', 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');

  final json = CkJsonObject();
  json.load(resp.bodyStr);

  json.emitCompact = false;

  print(json.emit());

  // A response code = 200 indicates success, and the response body contains JSON such as this:

  // {
  //   "kind": "storage#objects",
  //   "items": [
  //     {
  //       "kind": "storage#object",
  //       "id": "chilkat-ocean/file with space char.jpg/1555776690752366",
  //       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg",
  //       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg?generation=1555776690752366&alt=media",
  //       "name": "file with space char.jpg",
  //       "bucket": "chilkat-ocean",
  //       "generation": "1555776690752366",
  //       "metageneration": "1",
  //       "contentType": "image/jpeg",
  //       "storageClass": "MULTI_REGIONAL",
  //       "size": "6229",
  //       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
  //       "crc32c": "9RjgwQ==",
  //       "etag": "CO6WguiH3+ECEAE=",
  //       "timeCreated": "2019-04-20T16:11:30.752Z",
  //       "updated": "2019-04-20T16:11:30.752Z",
  //       "timeStorageClassUpdated": "2019-04-20T16:11:30.752Z"
  //     },
  //     {
  //       "kind": "storage#object",
  // 
  //       "id": "chilkat-ocean/penguins.jpg/1555775749593296",
  //       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/penguins.jpg",
  //       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/penguins.jpg?generation=1555775749593296&alt=media",
  //       "name": "penguins.jpg",
  //       "bucket": "chilkat-ocean",
  //       "generation": "1555775749593296",
  //       "metageneration": "1",
  //       "contentType": "image/jpeg",
  //       "storageClass": "MULTI_REGIONAL",
  //       "size": "777835",
  //       "md5Hash": "nTd7EM53jEk4s8fixjoimg==",
  //       "crc32c": "ixxYVw==",
  //       "etag": "CNCxnqeE3+ECEAE=",
  //       "timeCreated": "2019-04-20T15:55:49.593Z",
  //       "updated": "2019-04-20T15:55:49.593Z",
  //       "timeStorageClassUpdated": "2019-04-20T15:55:49.593Z"
  //     },
  //     {
  //       "kind": "storage#object",
  //       "id": "chilkat-ocean/starfish.jpg/1628958192639968",
  //       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg",
  //       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/starfish.jpg?generation=1628958192639968&alt=media",
  //       "name": "starfish.jpg",
  //       "bucket": "chilkat-ocean",
  //       "generation": "1628958192639968",
  //       "metageneration": "1",
  //       "contentType": "image/jpeg",
  //       "storageClass": "MULTI_REGIONAL",
  //       "size": "6229",
  //       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
  //       "crc32c": "9RjgwQ==",
  //       "etag": "COC/tJP2sPICEAE=",
  //       "timeCreated": "2021-08-14T16:23:12.660Z",
  //       "updated": "2021-08-14T16:23:12.660Z",
  //       "timeStorageClassUpdated": "2021-08-14T16:23:12.660Z"
  //     }
  //   ]
  // }

  // Use this online tool to generate parsing code from sample JSON: 
  // Generate Parsing Code from JSON

  var id = '';
  var selfLink = '';
  var mediaLink = '';
  var name = '';
  var bucket = '';
  var generation = '';
  var metageneration = '';
  var contentType = '';
  var storageClass = '';
  var size = '';
  var md5Hash = '';
  var crc32c = '';
  var etag = '';
  var timeCreated = '';
  var updated = '';
  var timeStorageClassUpdated = '';

  var kind = json.stringOf('kind');
  var i = 0;
  final countI = json.sizeOfArray('items');
  while (i < countI) {
    json.i = i;
    kind = json.stringOf('items[i].kind');
    id = json.stringOf('items[i].id');
    selfLink = json.stringOf('items[i].selfLink');
    mediaLink = json.stringOf('items[i].mediaLink');
    name = json.stringOf('items[i].name');
    bucket = json.stringOf('items[i].bucket');
    generation = json.stringOf('items[i].generation');
    metageneration = json.stringOf('items[i].metageneration');
    contentType = json.stringOf('items[i].contentType');
    storageClass = json.stringOf('items[i].storageClass');
    size = json.stringOf('items[i].size');
    md5Hash = json.stringOf('items[i].md5Hash');
    crc32c = json.stringOf('items[i].crc32c');
    etag = json.stringOf('items[i].etag');
    timeCreated = json.stringOf('items[i].timeCreated');
    updated = json.stringOf('items[i].updated');
    timeStorageClassUpdated = json.stringOf('items[i].timeStorageClassUpdated');
    i++;
  }
}