Question

我尝试运行此Java代码以列出Google云端硬盘中的所有文件：

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.DriveScopes;
import com.google.api.services.drive.model.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.List;

public class Quickstart
{
    /**
     * Application name.
     */
    private static final String APPLICATION_NAME = "Drive API Java Quickstart";

    /**
     * Directory to store user credentials for this application.
     */
    private static final java.io.File DATA_STORE_DIR = new java.io.File(
        System.getProperty("user.home"), ".credentials/drive-java-quickstart");

    /**
     * Global instance of the {@link FileDataStoreFactory}.
     */
    private static FileDataStoreFactory DATA_STORE_FACTORY;

    /**
     * Global instance of the JSON factory.
     */
    private static final JsonFactory JSON_FACTORY
        = JacksonFactory.getDefaultInstance();

    /**
     * Global instance of the HTTP transport.
     */
    private static HttpTransport HTTP_TRANSPORT;

    /**
     * Global instance of the scopes required by this quickstart.
     *
     * If modifying these scopes, delete your previously saved credentials at ~/.credentials/drive-java-quickstart
     */
    private static final List<String> SCOPES = Arrays.asList(DriveScopes.DRIVE_METADATA_READONLY);

    static
    {
        try
        {
            HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
            DATA_STORE_FACTORY = new FileDataStoreFactory(DATA_STORE_DIR);
        }
        catch (Throwable t)
        {
            t.printStackTrace();
            System.exit(1);
        }
    }

    /**
     * Creates an authorized Credential object.
     *
     * @return an authorized Credential object.
     * @throws IOException
     */
    public static Credential authorize() throws IOException
    {
        // Load client secrets.
        InputStream in
            = Quickstart.class.getResourceAsStream("/development-241a19899242.json");
        GoogleClientSecrets clientSecrets
            = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

        // Build flow and trigger user authorization request.
        GoogleAuthorizationCodeFlow flow
            = new GoogleAuthorizationCodeFlow.Builder(
                HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
            .setDataStoreFactory(DATA_STORE_FACTORY)
            .setAccessType("offline")
            .build();
        Credential credential = new AuthorizationCodeInstalledApp(
            flow, new LocalServerReceiver()).authorize("user");
        System.out.println(
            "Credentials saved to " + DATA_STORE_DIR.getAbsolutePath());
        return credential;
    }

    /**
     * Build and return an authorized Drive client service.
     *
     * @return an authorized Drive client service
     * @throws IOException
     */
    public static Drive getDriveService() throws IOException
    {
        Credential credential = authorize();
        return new Drive.Builder(
            HTTP_TRANSPORT, JSON_FACTORY, credential)
            .setApplicationName(APPLICATION_NAME)
            .build();
    }

    public static void main(String[] args) throws IOException
    {
        // Build a new authorized API client service.
        Drive service = getDriveService();

        // Print the names and IDs for up to 10 files.
        FileList result = service.files().list()
            .setPageSize(10)
            .setFields("nextPageToken, files(id, name)")
            .execute();
        List<File> files = result.getFiles();
        if (files == null || files.size() == 0)
        {
            System.out.println("No files found.");
        }
        else
        {
            System.out.println("Files:");
            for (File file : files)
            {
                System.out.printf("%s (%s)\n", file.getName(), file.getId());
            }
        }
    }
}

当我运行代码时，我被重定向到登录页面以输入我的Google电子邮件凭据。我怎么能跳过这一步呢？代码我将完全在后台我需要使用JSON文件中的凭据。

Answer 1

您可能需要使用服务帐户和Perform Google Apps Domain-Wide Delegation of Authority进行检查。

在企业应用程序中，您可能希望以编程方式访问用户数据，而无需他们进行任何手动授权。在Google Apps域中，域管理员可以向第三方应用程序授予对其用户数据的域范围内访问权限 - 这称为域范围的授权。要以这种方式委派权限，域管理员可以将服务帐户与OAuth 2.0一起使用。

以下是creating a service account的链接：

授权服务帐户代表域中的用户访问数据有时被称为“将域范围的权限委派给服务帐户”。

如果您已授予对服务帐户的域范围访问权限并且您要模拟用户帐户，请使用 setServiceAccountUser 方法指定用户帐户的电子邮件地址 GoogleCredential 工厂。例如：

GoogleCredential credential = new GoogleCredential.Builder()
    .setTransport(httpTransport)
    .setJsonFactory(JSON_FACTORY)
    .setServiceAccountId(emailAddress)
    .setServiceAccountPrivateKeyFromP12File(new File("MyProject.p12"))
    .setServiceAccountScopes(Collections.singleton(SQLAdminScopes.SQLSERVICE_ADMIN))
    .setServiceAccountUser("user@example.com")
    .build();

还有一个关于Google Drive API with a Service Account的教程，它不是Java版本，但我希望这有助于您了解如何使用Google云端硬盘和服务帐户。

您要上传到您个人可以控制的帐户吗？您无需用户通过Google进行身份验证。您需要使用的是Google Drive API service account。

希望这有帮助。

Google Drive访问权限

1 个答案: