Took a week, but I did get it to work. For anyone else who runs into this
1. I was following the Ericsson documentation at:
https://labs.ericsson.com/apis/oauth2-framework/documentation#Web_Client_Flow
that got me as far as getting things to work on my local Google-app-engine dev
server. But when deploying to appspot and the real GAE world, it failed.
2. Problem seems to be that the in-memory storage of authTokens doesn't work in
google's cloud - perhaps due to how the processing is distributed (??).
3. The fix was to replace the in-memory storage of authTokens with db storage
of the tokens (for me that was Objectify and Google's BigTable)
4. This required changing the clientStore code from:
ClientStore clientStore = ClientStoreFactory.getInstance();
clientStore.clientStore("123456789", "secret1", "yourCallbackURI");
To:
ClientStoreFactory.setClientStoreImpl(MyDBClientStore.class, params);
ClientStore clientStore =
(ClientStore) ClientStoreFactory.getInstance();
And we need the two new classes referenced above:
MyDBClientStore - only difference here is that we extend
ClientStore
public class MyDBClientStore extends ClientStore
and
MyDBTokenGenerator - this is where the real work is as you have to save the
AuthToken in the database and that AuthToken consists of a token name and an
AuthenticatedUser. I had to change generateToken() (store to db) and
findToken() (retrieve from db) to get the basics to work.
And finally, I had to create classes MyAuthToken and MyAuthenticatedUser to
store this information through Objectify.
Now it works on the local dev server and on appspot.
RB
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