JWS-Passport

class MyApp {
    /* ... */
    protected void setup() {
        HTTPServer httpServer = new HTTPServer().port(1234);

        Passport passport = new Passport("/auth");
        OAuth2Strategy oAuth2Strategy = new OAuth2Strategy("http://localhost:1234");
        oAuth2Strategy.setHttpCallbackHandler((e, callback, name) -> {
            return "Hello " + callback.getProfile().getName();
        });

        oAuth2Strategy.use("google", new GoogleOAuth2Provider("myid", "mysecret").setScopes("https://www.googleapis.com/auth/userinfo.profile", "https://www.googleapis.com/auth/userinfo.email"));
        oAuth2Strategy.use("interaapps", new InteraAppsOAuth2Provider("myid", "mysecret").setScopes("user:read"));

        passport.use("oauth2", oAuth2Strategy);

        passport.createRoutes(httpServer);
        httpServer.start();

        // Creates Routes: /auth/oauth2/interaapps, /auth/oauth2/interaapps/callback
    }


    // JWS-Passport ships also an abstracted form of handling oauth2 
    public void oAuthWithoutHTTPServer() {
        OAuth2Strategy oAuth2Strategy = new OAuth2Strategy("http://localhost:1234");
        oAuth2Strategy.use("interaapps", new InteraAppsOAuth2Provider("myid", "mysecret").setScopes("user:read"));

        // Redirect
        String callbackUrl = ".../callback";
        String redirectUrl = oAuth2Strategy.get("interaapps").redirect(callbackUrl);

        // On callback
        OAuth2Callback callback = oAuth2Strategy.get("interaapps").callback(new AbstractObject().set("code", code), callbackUrl);
        System.out.println("Hello " + callback.getProfile().name);
    }

    /* ... */
}

<dependency>
    <groupId>org.javawebstack</groupId>
    <artifactId>Passport</artifactId>
    <version>1.0-SNAPSHOT<!-- VERSION --></version>
</dependency>