Migrate from GDATA to Google API Java Client

[Alexandre Jacquet]

Hello Guys,

I'm trying to migrate most of my code to Google API Java Client however i'm stuck right in the beginning.

Can anyone give me any light how should i make the requests for the OAuth3legged.

I have already seen all the WIkis on the API sites however i can't find any clues.

http://code.google.com/p/google-api-java-client/wiki/OAuth

Tks!

                                                                                           

Alexandre Jacquet Google Apps Deployment Specialst  São Paulo | SP | Brasil Tel.: 55 11 8064 6882

[Michael Manoochehri]

Hi Alexandre:

A really great example of using OAuth with Gdata is here:

http://code.google.com/p/gdata-java-client/source/browse/trunk/java/sample/oauth/OAuthExample.java

It walks you through each of the steps of the OAuth dance, and the code is fairly compact.

- Michael

[Michael Manoochehri]

Also, I recommend using the HMAC-SHA1 method for this sample, as you can simply provide your consumer key and secret without providing a private key to sign OAuth requests.

Michael.

[Alexandre Jacquet]

What about the inverse using OAuth in Google API JAVA Client.

I can't find any resource about this.

                                                                                           

Alexandre Jacquet Google Apps Deployment Specialst  São Paulo | SP | Brasil Tel.: 55 11 8064 6882

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[Alexandre Jacquet]

Hello Guys,

I'm basing on the BUZZ OAUTH Sample that is available at http://code.google.com/p/google-api-java-client/

However in stuck in this part, anyone can help me?

GoogleOAuthGetTemporaryToken temporaryToken = new GoogleOAuthGetTemporaryToken();

//temporaryToken.transport = Util.AUTH_TRANSPORT;

signer = new OAuthHmacSigner();

signer.clientSharedSecret = ConsumerCredentials.OAUTH_CONSUMER_KEY;

temporaryToken.signer = signer;

temporaryToken.consumerKey = ConsumerCredentials.OAUTH_CONSUMER_SECRET;

temporaryToken.scope = "https://apps-apis.google.com/a/feeds/";

temporaryToken.displayName = AppInfo.APP_DESCRIPTION;

System.out.println(temporaryToken.build());

OAuthCredentialsResponse tempCredentials = temporaryToken.execute();

signer.tokenSharedSecret = tempCredentials.tokenSecret;

It returns a NullPointer however i can't find what is missing

https://www.google.com/accounts/OAuthGetRequestToken?scope=https://apps-apis.google.com/a/feeds/&xoauth_displayname=Google-API-JAVA-CLIENT-SAMPLE

Exception in thread "main" java.lang.NullPointerException

at com.google.api.client.auth.oauth.AbstractOAuthGetToken.execute(AbstractOAuthGetToken.java:69)

at GroupSettingTests.main(GroupSettingTests.java:30)

                                                                                           

Alexandre Jacquet Google Apps Deployment Specialst  São Paulo | SP | Brasil Tel.: 55 11 8064 6882

On Tue, Jun 14, 2011 at 12:21 PM, Michael Manoochehri <manoo...@google.com> wrote:

Also, I recommend using the HMAC-SHA1 method for this sample, as you can simply provide your consumer key and secret without providing a private key to sign OAuth requests.

Michael.

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[Aaron]

Alexandre-

All of the google-api-client classes are open source, I would recommend that you download them as it helps a bunch when trying to troubleshoot this type of thing. In this case, if you look at line 69 of the AbstractOAuthGetToken class you can see that the only possibility for a null pointer exception is if you have a null transport. From your code above I see that you have commented out that line, so I'm going to assume that's why you're getting your exception.

If you want to be able to execute the temporary token request you're going to have to set a transport on the temporary token. The transport you use will vary depending on the environment you're in, but it can be as easy as just new NetHttpTransport().

Also, you may find it more helpful for posting questions pertaining to the Google API Java Client in its specific group: https://groups.google.com/group/google-api-java-client?pli=1

-Aaron

[Alexandre Jacquet]

Thank you Aaron,

I didn't know about the other group.

About Null Point even with that line uncommented it raises the exception.

=\

                                                                                           

Alexandre Jacquet Google Apps Deployment Specialst  São Paulo | SP | Brasil Tel.: 55 11 8064 6882

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[Aaron]

Alexandre-

I'm not sure what you have behind "Util.AUTH_TRANSPORT" but I'm guessing that that's where your problem lies. My guess is that somehow that is still null. If you just set it equal to "new NetHttpTransport()" do you still get the null pointer exception?

-Aaron

[Alexandre Jacquet]

Hey,

After the change you suggested I'm raising now a 400 Bad Request, i think the problem is i'm missing an attribute =\ i'll dig a little deeper however it would be great if google could create a raw sample :P

Here is the output raised by the exception.

https://www.google.com/accounts/OAuthGetRequestToken?scope=https://apps-apis.google.com/a/feeds/&xoauth_displayname=Google-API-JAVA-CLIENT-SAMPLE

Exception in thread "main" com.google.api.client.http.HttpResponseException: 400 Bad Request

at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:380)

at com.google.api.client.auth.oauth.AbstractOAuthGetToken.execute(AbstractOAuthGetToken.java:73)

at GroupSettingTests.main(GroupSettingTests.java:31)

                                                                                           

Alexandre Jacquet Google Apps Deployment Specialst  São Paulo | SP | Brasil Tel.: 55 11 8064 6882

-Aaron

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[Aaron]

Alexandre-

You also need to set the callback parameter. You can find that information about the parameters that you need here: http://code.google.com/apis/accounts/docs/OAuth_ref.html

The following may help you... The following illustrates the process for setting up OAuth 1.0 using the google-api-java-client for a client application (non-web application):

// Step 1: Get OAuth Request Token

GoogleOAuthGetTemporaryToken temporaryToken =
    new GoogleOAuthGetTemporaryToken();

temporaryToken.callback = "oob";
signer.clientSharedSecret = <CLIENT_SHARED_SECRET_HERE>;
temporaryToken.signer = signer;
temporaryToken.consumerKey = <CONSUMER_KEY_HERE>;
temporaryToken.scope = "https://apps-apis.google.com/a/feeds";
temporaryToken.transport = new NetHttpTransport();
OAuthCredentialsResponse tempCreds = temporaryToken.execute();

// Step 2: Get OAuth Authorize Token
signer.tokenSharedSecret = tempCreds.tokenSecret;
GoogleOAuthAuthorizeTemporaryTokenUrl authorizeUrl = new GoogleOAuthAuthorizeTemporaryTokenUrl();
authorizeUrl.temporaryToken = tempCreds.token;
String authorizationUrl = authorizeUrl.build();
System.out.println("Go to this authorizationUrl: " + authorizationUrl);
BufferedReader inStream = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Paste verification code: ");
String verifier = inStream.readLine();

// Step 3: Get OAuth Access Token
GoogleOAuthGetAccessToken accessToken = new GoogleOAuthGetAccessToken();
accessToken.temporaryToken = tempCreds.token;
accessToken.signer = signer;
accessToken.consumerKey = <CONSUMER_KEY_HERE>;
accessToken.verifier = verifier;
accessToken.transport = new NetHttpTransport();
OAuthCredentialsResponse creds = accessToken.execute();
signer.tokenSharedSecret = creds.tokenSecret;

-Aaron

[Alexandre Jacquet]

Ok two things,

I should use 

signer.tokenSharedSecret for Domains? and signer.clientSharedSecret for Gmail applications or is non-sense?

For this sample that you have sent is returning the same error.

GoogleOAuthGetTemporaryToken temporaryToken = new GoogleOAuthGetTemporaryToken();

temporaryToken.callback = "oob";

signer = new OAuthHmacSigner();

signer.tokenSharedSecret = consumerSecret;

temporaryToken.signer = signer;

temporaryToken.consumerKey = consumerKey;

temporaryToken.scope = "https://apps-apis.google.com/a/feeds";

temporaryToken.transport = new NetHttpTransport();

OAuthCredentialsResponse tempCreds = temporaryToken.execute();

Exception in thread "main" com.google.api.client.http.HttpResponseException: 400 Bad Request

at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:380)

at com.google.api.client.auth.oauth.AbstractOAuthGetToken.execute(AbstractOAuthGetToken.java:73)

at GroupSettingTests.main(GroupSettingTests.java:33)

url GoogleOAuthGetTemporaryToken  (id=18)

callback "oob" (id=27)

classInfo ClassInfo  (id=32)

consumerKey "ajsolutions.me" (id=34)

displayName "appTest" (id=31)

fragment null

host "www.google.com" (id=35)

keySet null

pathParts ArrayList<E>  (id=36)

port -1

scheme "https" (id=42)

scope "https://apps-apis.google.com/a/feeds" (id=45)

signer OAuthHmacSigner  (id=46)

clientSharedSecret ----consumerSecret----- (id=124)

tokenSharedSecret ----consumerSecret----- (id=124)

transport NetHttpTransport  (id=49)

unknownFields ArrayMap<K,V>  (id=52)

usePost false

values null

                                                                                           

Alexandre Jacquet Google Apps Deployment Specialst  São Paulo | SP | Brasil Tel.: 55 11 8064 6882

-Aaron

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[Aaron]

Hmm...  Don't know what to say. The example works fine for me, the only thing I can guess is that somehow your key and secret aren't right, but if they were working in GData I would assume that they would work in the api-java-client.

From the documentation it says:

HTTP 400 Bad Request: in the case of an unsupported or missing parameter, an unsupported oauth_signature_method, or other error in the request format or content.

Which isn't super helpful. You could try turning on logging for the api-java-client so you know what your request looks like and make sure that it matches up with the documentation.
 

[Alexandre Jacquet]

Well, I will post the question alse in Google API Java Client since is more a Client issue.

Thank you for all the help aaron!

                                                                                           

Alexandre Jacquet Google Apps Deployment Specialst  São Paulo | SP | Brasil Tel.: 55 11 8064 6882

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