Add anonymous user APIs

[kiootic]

No description provided.

[louischan-oursky]

The ID token still have identity and the SDK cannot decode it. (unknown identity type). We are going to remove the identity from ID token, right?

[kiootic]

The ID token still have identity and the SDK cannot decode it. (unknown identity type). We are going to remove the identity from ID token, right?

I think so. We should update the existing issue (SkygearIO/skygear-server#1370) for planned breaking changes.

[kiootic]

@louischan-oursky @carmenlau here is some sample code for testing RN SDK:

  const doAuth = useCallback(async () => {
    const {user} = await container.auth.authenticateAnonymously();
    console.log(user);
  }, []);

  const doPromote = useCallback(async () => {
    const result = await container.auth.promoteAnonymousUser({
      redirectURI: "rntest://callback"
    });
    console.log(result);
  }, []);

NOTE: for now please comment out the decodeIdentity calls to test it.

[louischan-oursky]

It works fine on iOS simulator. I tested it with Android emulator Pixel 2 with API Level 29. It fails at a native method in SGSkygearReactNativeModule.java:187 with the root exception android.security.KeyStoreException: Incompatible padding mode. Any idea?

[kiootic]

Strange, I remember fixing both this and the WritableMap issue before. Seems the changes somehow got lost. I'll fix it tomorrow then.