StorageSample.java

StorageSample.java

    /**
     * Main class for the Cloud Storage API command line sample.
     * Demonstrates how to make an authenticated API call using OAuth 2 helper classes.
     */
    public class StorageSample {
    
      /**
       * Be sure to specify the name of your application. If the application name is {@code null} or
       * blank, the application will log a warning. Suggested format is "MyCompany-ProductName/1.0".
       */
      private static final String APPLICATION_NAME = "MyCompnay/1.0";
    
      /** Directory to store user credentials. */
      private static final java.io.File DATA_STORE_DIR =
          new java.io.File(System.getProperty("user.home"), ".store/storage_sample");
    
      /**
       * Global instance of the {@link DataStoreFactory}. The best practice is to make it a single
       * globally shared instance across your application.
       */
      private static FileDataStoreFactory dataStoreFactory;
    
      /** Global instance of the JSON factory. */
      private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
    
      /** Global instance of the HTTP transport. */
      private static HttpTransport httpTransport;
    
      @SuppressWarnings("unused")
      private static Storage client;
    
      /** Authorizes the installed application to access user's protected data. */
      private static Credential authorize() throws Exception {
        // load client secrets
        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY,
            new InputStreamReader(StorageSample.class.getResourceAsStream("/client_secrets.json")));
        if (clientSecrets.getDetails().getClientId().startsWith("Enter") ||
            clientSecrets.getDetails().getClientSecret().startsWith("Enter ")) {
          System.out.println(
              "Overwrite the src/main/resources/client_secrets.json file with the client secrets file "
              + "you downloaded from the Quickstart tool or manually enter your Client ID and Secret "
              + "from https://code.google.com/apis/console/?api=storage#project:<project_id> "
              + "into src/main/resources/client_secrets.json");
          System.exit(1);
        }
    
        // Set up authorization code flow.
        // Ask for only the permissions you need. Asking for more permissions will
        // reduce the number of users who finish the process for giving you access
        // to their accounts. It will also increase the amount of effort you will
        // have to spend explaining to users what you are doing with their data.
        // Here we are listing all of the available scopes. You should remove scopes
        // that you are not actually using.
        Set<String> scopes = new HashSet<String>();
        scopes.add(StorageScopes.DEVSTORAGE_FULL_CONTROL);
        scopes.add(StorageScopes.DEVSTORAGE_READ_ONLY);
        scopes.add(StorageScopes.DEVSTORAGE_READ_WRITE);
    
        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
            httpTransport, JSON_FACTORY, clientSecrets, scopes)
            .setDataStoreFactory(dataStoreFactory)
            .build();
        // authorize
        return new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
      }
    
      public static void main(String[] args) {
        try {
          // initialize the transport
          httpTransport = GoogleNetHttpTransport.newTrustedTransport();
    
          // initialize the data store factory
          dataStoreFactory = new FileDataStoreFactory(DATA_STORE_DIR);
    
          // authorization
          Credential credential = authorize();
          // set up global Storage instance
          client = new Storage.Builder(httpTransport, JSON_FACTORY, credential).setApplicationName(APPLICATION_NAME).build();
          
          client.objects().list("<bucket_id>").executeAndDownloadTo(System.out);
          
        } catch (IOException e) {
          System.err.println(e.getMessage());
        } catch (Throwable t) {
          t.printStackTrace();
        }
        System.exit(1);
      }
    }
}