I'm trying to access Google's Documents List API 3.0 with OAuth 2.0 but I'm having some troubles with a 401 Error.
After user have accepted, my code is the following:
GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
oauthParameters.setOAuthConsumerKey(CLIENT_ID);
oauthParameters.setOAuthConsumerSecret(CLIENT_SECRET);
oauthParameters.setOAuthToken(token);
oauthParameters.setOAuthTokenSecret(tokenSecret);
oauthParameters.setScope("https://docs.google.com/feeds/");
service = new DocsService("myapp");
service.setOAuthCredentials(oauthParameters, new OAuthHmacSha1Signer());
DocumentListFeed feed = service.getFeed(new URL("https://docs.google.com/feeds/default/private/full/?v=3"), DocumentListFeed.class);
Then, in the last line -getFeed()- throws the exception:
com.google.gdata.util.AuthenticationException: Token invalid - Invalid token: Request token used when not allowed.
<HTML>
<HEAD>
<TITLE>Token invalid - Invalid token: Request token used when not allowed.</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<H1>Token invalid - Invalid token: Request token used when not allowed.</H1>
<H2>Error 401</H2>
</BODY>
</HTML>
What's going on? On a static main test class works like a charm, but when I run it on the server this line does not works anymore. Any idea?
SOLVED
The access token needs to be retrieved this way, with a GoogleOAuthHelper, not with the GoogleOAuthParameters directly:
String accessToken = oauthHelper.getAccessToken(oauthParameters);
You are not using OAuth 2.0 but OAuth 1.0 with HMAC-SHA1 as the signature method. To use OAuth 2.0, you need at least version 1.47.0 of the gdata-java-client library and version 1.8.0-beta of the google-oauth-java-client library.
Using the google-api-java-client library provides helper classes to deal with Google's OAuth 2.0 implementation.
To retrieve OAuth 2.0 credentials, you can use this code snippet:
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeRequestUrl;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.jackson.JacksonFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.List;
public class MyClass {
// Retrieve the CLIENT_ID and CLIENT_SECRET from an APIs Console project:
// https://code.google.com/apis/console
static String CLIENT_ID = "<YOUR_CLIENT_ID>";
static String CLIENT_SECRET = "<YOUR_CLIENT_SECRET>";
// Change the REDIRECT_URI value to your registered redirect URI for web
// applications.
static String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob";
// Add other requested scopes.
static List<String> SCOPES = Arrays.asList("https://docs.google.com/feeds");
/**
* Retrieve OAuth 2.0 credentials.
*
* @return OAuth 2.0 Credential instance.
*/
static Credential getCredentials() throws IOException {
HttpTransport transport = new NetHttpTransport();
JacksonFactory jsonFactory = new JacksonFactory();
// Step 1: Authorize -->
String authorizationUrl =
new GoogleAuthorizationCodeRequestUrl(CLIENT_ID, REDIRECT_URI, SCOPES).build();
// Point or redirect your user to the authorizationUrl.
System.out.println("Go to the following link in your browser:");
System.out.println(authorizationUrl);
// Read the authorization code from the standard input stream.
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("What is the authorization code?");
String code = in.readLine();
// End of Step 1 <--
// Step 2: Exchange -->
GoogleTokenResponse response =
new GoogleAuthorizationCodeTokenRequest(transport, jsonFactory, CLIENT_ID, CLIENT_SECRET,
code, REDIRECT_URI).execute();
// End of Step 2 <--
// Build a new GoogleCredential instance and return it.
return new GoogleCredential.Builder().setClientSecrets(CLIENT_ID, CLIENT_SECRET)
.setJsonFactory(jsonFactory).setTransport(transport).build()
.setAccessToken(response.getAccessToken()).setRefreshToken(response.getRefreshToken());
}
// …
}
Once you have the OAuth 2.0 credential, you can authorize a service object as follow:
// ...
import com.google.api.client.auth.oauth2.Credential;
import com.google.gdata.client.docs.DocsService;
import com.google.gdata.data.docs.DocumentListEntry;
import com.google.gdata.data.docs.DocumentListFeed;
import com.google.gdata.util.ServiceException;
// ...
import java.io.IOException;
import java.net.URL;
// ...
public class MyClass {
// …
/**
* Print document entries using the provided authorized DocsService.
*
* @param credential OAuth 2.0 credential to use to authorize the requests.
* @throws IOException
* @throws ServiceException
*/
static void printDocuments(Credential credential) throws IOException, ServiceException {
// Instantiate and authorize a new DocsService object.
DocsService service = new DocsService("<YOUR_APPLICATION_NAME>");
service.setOAuth2Credentials(credential);
// Send a request to the Documents List API to retrieve document entries.
URL feedUri = new URL("https://docs.google.com/feeds/default/private/full/");
DocumentListFeed feed = service.getFeed(feedUri, DocumentListFeed.class);
for (DocumentListEntry entry : feed.getEntries()) {
System.out.println("Title: " + entry.getTitle().getPlainText());
}
}
// ...
}
The CLIENT_ID, CLIENT_SECRET can be retrieved from the APIs Console and the REDIRECT_URI must match one that has been registered with your API Project.
Here's how to add OAuth2.0 token to GData Service:
SpreadsheetService service = new SpreadsheetService("MySpreadsheetIntegration-v1");
service.setOAuth2Credentials(new Credential(BearerToken
.authorizationHeaderAccessMethod())
.setFromTokenResponse(new TokenResponse().setAccessToken(mToken)));
Make sure to import all the necessary libraries (which is a lot).
On Android token should be obtained using Google Play Services OAuth mechanism:
String token = GoogleAuthUtil.getToken(String email, String scopes);
来源：https://stackoverflow.com/questions/10242751/oauth-invalid-token-request-token-used-when-not-allowed