Question

如何从第一次授权代码获取刷新令牌和访问令牌？而且，如何重新使用此刷新令牌来获取使用Java API上传到Google云端硬盘的新访问令牌？这不是Web应用程序。它在Java Swing代码中。

Answer 1

我们可以通过以下代码

重复使用刷新令牌来获取新的访问令牌

public class OAuthRefreshToken implements CredentialRefreshListener  {

    public static GoogleCredential getAccessTokenFromRefreshToken( String refreshToken, HttpTransport transport, com.google.api.client.json.JsonFactory jsonFactory, String CLIENT_ID, String CLIENT_SECRET) throws IOException
    {
        GoogleCredential.Builder credentialBuilder = new GoogleCredential.Builder()
        .setTransport(transport).setJsonFactory(jsonFactory)
        .setClientSecrets(CLIENT_ID, CLIENT_SECRET);
        credentialBuilder.addRefreshListener(new OAuthRefreshToken());

        GoogleCredential credential = credentialBuilder.build();
        credential.setRefreshToken(refreshToken);
        credential.refreshToken();
        return credential;
    }

    @Override
    public void onTokenErrorResponse(Credential arg0, TokenErrorResponse arg1)
            throws IOException {
        // TODO Auto-generated method stub
        System.out.println("Error occured !");
        System.out.println(arg1.getError());
    }

    @Override
    public void onTokenResponse(Credential arg0, TokenResponse arg1)
            throws IOException {
        // TODO Auto-generated method stub
        System.out.println(arg0.getAccessToken());
        System.out.println(arg0.getRefreshToken());
    }

}

Answer 2

以下是我最近通过Google云端硬盘文档中的基本示例和一些实验构建的解决方案： IApiKey包含静态字符串CLIENT_ID，依此类推。 ITokenPersistence是一个允许加载和保存令牌（作为String）的接口。它从上传器中解除了持久性机制（我在Eclipse e4 RCP应用程序中使用了Preferences）。这可以像将令牌存储在文件中一样简单IAthorizationManager是一个接口，用于让用户授予访问权限并输入代码来创建刷新令牌。我实现了一个包含浏览器小部件的Dialog来授予访问权限，并实现了一个文本框来复制和粘贴代码。自定义异常GoogleDriveException会将API类隐藏在其余代码中。

public final class Uploader implements IApiKey {

    public static final String TEXT_PLAIN = "text/plain";

    private final ITokenPersistence tokenManager;
    private final IAuthorizationManager auth;

    public Uploader(final ITokenPersistence tm, final IAuthorizationManager am) {
        this.tokenManager = tm;
        this.auth = am;
    }

    private GoogleCredential createCredentialWithRefreshToken(
            final HttpTransport transport,
            final JsonFactory jsonFactory,
            final String clientId,
            final String clientSecret,
            final TokenResponse tokenResponse) {
        return new GoogleCredential.Builder().setTransport(transport)
                .setJsonFactory(jsonFactory)
                .setClientSecrets(clientId, clientSecret)
                .build()
                .setFromTokenResponse(tokenResponse);
    }

    /**
     * Upload the given file to Google Drive.
     * <P>
     * The name in Google Drive will be the same as the file name.
     * @param fileContent a file of type text/plain
     * @param description a description for the file in Google Drive
     * @return Answer the ID of the uploaded file in Google Drive.
     *         Answer <code>null</code> if the upload failed.
     * @throws IOException
     * @throws {@link GoogleDriveException} when a <code>TokenResponseException</code> had been
     *         intercepted while inserting (uploading) the file.
     */
    public String upload(final java.io.File fileContent, final String description) throws IOException, GoogleDriveException {
        HttpTransport httpTransport = new NetHttpTransport();
        JsonFactory jsonFactory = new JacksonFactory();

        // If we do not already have a refresh token a flow is created to get a refresh token.
        // To get the token the user has to visit a web site and enter the code afterwards
        // The refresh token is saved and may be reused.
        final GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
                httpTransport,
                jsonFactory,
                CLIENT_ID,
                CLIENT_SECRET,
                Arrays.asList(DriveScopes.DRIVE))
        .setAccessType("offline")
        .setApprovalPrompt("auto").build();

        final String url = flow.newAuthorizationUrl().setRedirectUri(REDIRECT_URI).build();
        final String refreshToken = this.tokenManager.loadRefreshToken();

        GoogleCredential credential = null;
        if( refreshToken == null ) {
            // no token available: get one
            String code = this.auth.authorize(url);
            GoogleTokenResponse response = flow.newTokenRequest(code).setRedirectUri(REDIRECT_URI).execute();
            this.tokenManager.saveRefreshToken(response.getRefreshToken());
            credential = this.createCredentialWithRefreshToken(httpTransport, jsonFactory, CLIENT_ID, CLIENT_SECRET, response);
        }
        else {
            // we have a token, if it is expired or revoked by the user the service call (see below) may fail
            credential = new GoogleCredential.Builder()
            .setJsonFactory(jsonFactory)
            .setTransport(httpTransport)
            .setClientSecrets(CLIENT_ID, CLIENT_SECRET)
            .build();
            credential.setRefreshToken(refreshToken);
        }

        //Create a new authorized API client
        final Drive service = new Drive.Builder(httpTransport, jsonFactory, credential)
        .setApplicationName(APP_NAME)
        .build();

        //Insert a file
        final File body = new File();
        body.setTitle(fileContent.getName());
        body.setDescription(description);
        body.setMimeType(TEXT_PLAIN);
        final FileContent mediaContent = new FileContent(TEXT_PLAIN, fileContent);

        try {
            final File file = service.files().insert(body, mediaContent).execute();
            return ( file != null ) ? file.getId() : null;
        } catch (TokenResponseException e) {
            e.printStackTrace();
            throw new GoogleDriveException(e.getDetails().getErrorDescription(), e.getCause());
        }
    }

}

刷新令牌并重用此令牌以获取新的访问令牌java

2 个答案: