Using Auth with Endpoints

Question

I defined a simple API using Google Cloud Endpoints:

@Api(name = "realestate", version = "v1", clientIds = { com.google.api.server.spi.Constant.API_EXPLORER_CLIENT_ID }, scopes = {
        "https://www.googleapis.com/auth/userinfo.email",
        "https://www.googleapis.com/auth/userinfo.profile" })
public class RealEstatePropertyV1 {

    @ApiMethod(name = "create", path = "properties", httpMethod = HttpMethod.POST)
    public void create(RealEstateProperty property, User user)
            throws UnauthorizedException {
        if (user == null) {
            throw new UnauthorizedException("Must log in");
        }
        System.out.println(user.getEmail());
    }

}

Then I try to test it using the API explorer. I activated OAuth 2.0. But when I execute the request, the User object is null.

Jun 23, 2013 10:21:50 AM com.google.appengine.tools.development.DevAppServerImpl start
INFO: Dev App Server is now running
Jun 23, 2013 10:22:42 AM com.google.api.server.spi.SystemServiceServlet init
INFO: SPI restricted: true
Jun 23, 2013 10:22:43 AM com.google.api.server.spi.WebApisUserService getCurrentUser
WARNING: getCurrentUser: clientId  not allowed
Jun 23, 2013 10:22:43 AM com.google.api.server.spi.SystemService invokeServiceMethod
INFO: cause={0}
com.google.api.server.spi.response.UnauthorizedException: Must log in
    at com.realestate.api.v1.RealEstatePropertyV1.create(RealEstatePropertyV1.java:44)

Answer 1

The message getCurrentUser: clientId not allowed indicates that the client ID associated with the token is the empty string. This doesn't seem possible and may be a strange bug/quirk.

You should check the token sent in the request, it will be in the Request section in something like

GET https://www.googleapis.com/oauth2/v2/userinfo?key={YOUR_API_KEY}

Authorization:  Bearer ya29....
X-JavaScript-User-Agent:  Google APIs Explorer

and your token is the one that starts with ya29.. You should make sure the token info checks out by sending it into the tokeninfo API:

https://developers.google.com/apis-explorer/#p/oauth2/v2/oauth2.tokeninfo