Class FilterExample

src/test/java/spark/examples/filter/FilterExample.java:45–80

Example showing a very simple (and stupid) authentication filter that is executed before all other resources. When requesting the resource with e.g. http://localhost:4567/hello?user=some&password=guy the filter will stop the execution and the client will get a 401 UNAUTHORIZED with the content 'You

 * @author Per Wendel
 */
public class FilterExample {

    private static Map<String, String> usernamePasswords = new HashMap<>();

    public static void main(String[] args) {

        usernamePasswords.put("foo", "bar");
        usernamePasswords.put("admin", "admin");

        before(new Filter() {
            @Override
            public void handle(Request request, Response response) {
                String user = request.queryParams("user");
                String password = request.queryParams("password");

                String dbPassword = usernamePasswords.get(user);
                if (!(password != null && password.equals(dbPassword))) {
                    halt(401, "You are not welcome here!!!");
                }
            }
        });

        before("/hello", (request, response) -> {
            response.header("Foo", "Set by second before filter");
        });

        get("/hello", (request, response) -> {
            return "Hello World!";
        });

        after("/hello", (request, response) -> {
            response.header("spark", "added by after-filter");
        });

    }
}