/*
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http-oauth - OAuth Extensions to jdk.httpserver
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Copyright (C) 2021 Ulrich Hilger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package de.uhilger.httpserver.oauth;
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import com.google.gson.Gson;
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import com.sun.net.httpserver.Headers;
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import com.sun.net.httpserver.HttpContext;
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import com.sun.net.httpserver.HttpExchange;
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import com.sun.net.httpserver.HttpHandler;
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import de.uhilger.httpserver.auth.realm.User;
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import de.uhilger.httpserver.base.HttpHelper;
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import de.uhilger.httpserver.base.HttpResponder;
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import java.io.IOException;
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import java.util.logging.Logger;
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/**
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* Ein Login Handler, der zur Authentifizierung ein Objekt der Klasse
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* BearerAuthenticator im HttpContext benoetigt.
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*
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* Der Authenticator wird mit der Methode
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* context.getAttributes().get(ATTR_AUTHENTICATOR);
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* aus dem HttpContext entnommen, d.h., der Authenticator muss zuvor dort
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* eingetragen werden. Das kann wie folgt vonstatten gehen:
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*
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* HttpContext context = server.createContext("/myapp/secure/service", new SomeServiceHandler());
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* BearerApiAuthenticator auth = new BearerAuthenticator();
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* context.setAuthenticator(auth);
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*
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* ...und danach...
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*
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* context = server.createContext("/myapp/login", new BearerLoginHandler());
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* context.getAttributes().put(LoginHandler.ATTR_AUTHENTICATOR, auth);
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*
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* @author Ulrich Hilger
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* @version 1, 08.06.2021
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*/
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public class BearerLoginHandler implements HttpHandler {
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private static final Logger logger = Logger.getLogger(BearerLoginHandler.class.getName());
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public static final String ATTR_AUTHENTICATOR = "authenticator";
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public static final String CACHE_CONTROL = "Cache-Control";
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public static final String NO_STORE = "no-store";
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public static final String PRAGMA = "Pragma";
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public static final String NO_CACHE = "no-cache";
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public static final String BEARER_CONTENT_TYPE = "application/json;charset=UTF-8";
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/*
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gemaess RFC 6750 lautet die Antwort auf eine erfolgreiche Anmeldung
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wie folgt:
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HTTP/1.1 200 OK
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Content-Type: application/json;charset=UTF-8
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Cache-Control: no-store
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Pragma: no-cache
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{
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"access_token":"mF_9.B5f-4.1JqM",
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"token_type":"Bearer",
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"expires_in":3600,
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"refresh_token":"tGzv3JOkF0XG5Qx2TlKWIA"
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}
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*/
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/**
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* Login-Anfragen ausfuehren
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*
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* @param exchange das Objekt mit Informationen zu HTTP-Anfrage und -Antwort
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* @throws IOException
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*/
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@Override
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public void handle(HttpExchange exchange) throws IOException {
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HttpContext context = exchange.getHttpContext();
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Object o = context.getAttributes().get(ATTR_AUTHENTICATOR);
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if (o instanceof BearerAuthenticator) {
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BearerAuthenticator auth = (BearerAuthenticator) o;
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User user = getUser(exchange);
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LoginResponse response = auth.login(user.getName(), user.getPassword());
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handleLoginResponse(exchange, response);
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} else {
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HttpResponder r = new HttpResponder();
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r.antwortSenden(exchange, 500, "No suitable authenticator.");
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}
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}
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/**
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* Die Antwort des Authenticators auf eine Login-Anfrage verarbeiten
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* @param exchange das Objekt mit Informationen zu HTTP-Anfrage und -Antwort
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* @param response die Antwort des Autehnticators
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* @throws IOException
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*/
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protected void handleLoginResponse(HttpExchange exchange, LoginResponse response) throws IOException {
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if(response != null) {
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setLoginHeader(exchange);
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HttpResponder r = new HttpResponder();
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r.antwortSenden(exchange, 200, response.toJson());
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} else {
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HttpResponder r = new HttpResponder();
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r.antwortSenden(exchange, 406, "Login failed.");
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}
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}
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private void setLoginHeader(HttpExchange exchange) {
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Headers headers = exchange.getResponseHeaders();
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headers.add(HttpHelper.CONTENT_TYPE, BEARER_CONTENT_TYPE);
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headers.add(CACHE_CONTROL, NO_STORE);
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headers.add(PRAGMA, NO_CACHE);
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}
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private User getUser(HttpExchange exchange) throws IOException {
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/*
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Wenn ein JSON-Inhalt im Body uebermittelt wird, steht
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dort evtl. etwas wie
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{"name": "fred", "password": "secret"}
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das kann wie folgt gelesen werden
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*/
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String body = new HttpHelper().bodyLesen(exchange);
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Gson gson = new Gson();
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User user = gson.fromJson(body, User.class);
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return user;
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}
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}
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