working on authorization flow

de.srsoftware.oidc.api/src/main/java/de/srsoftware/oidc/api/Client.java

@@ -5,9 +5,15 @@ import static de.srsoftware.oidc.api.Constants.*;
 
 import java.util.Map;
 import java.util.Set;
+import java.util.UUID;
 
 public record Client(String id, String name, String secret, Set<String> redirectUris) {
 	public Map<String, Object> map() {
 		return Map.of(CLIENT_ID, id, NAME, name, SECRET, secret, REDIRECT_URIS, redirectUris);
 	}
+
+	public String generateCode() {
+		System.err.printf("%s.generateCode() not implemented!", getClass().getSimpleName());
+		return UUID.randomUUID().toString();
+	}
 }

de.srsoftware.oidc.api/src/main/java/de/srsoftware/oidc/api/Constants.java

@@ -2,9 +2,12 @@
 package de.srsoftware.oidc.api;
 
 public class Constants {
+	public
+	static final String CODE = "code";
 	public static final String CLIENT_ID     = "client_id";
 	public static final String NAME	         = "name";
 	public static final String REDIRECT_URI  = "redirect_uri";
 	public static final String REDIRECT_URIS = "redirect_uris";
 	public static final String SECRET        = "secret";
+	public static final String STATE         = "state";
 }

de.srsoftware.oidc.api/src/main/java/de/srsoftware/oidc/api/PathHandler.java

@@ -1,8 +1,7 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.oidc.api;
 
-import static java.net.HttpURLConnection.HTTP_BAD_REQUEST;
-import static java.net.HttpURLConnection.HTTP_OK;
+import static java.net.HttpURLConnection.*;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.sun.net.httpserver.HttpExchange;
@@ -11,6 +10,7 @@ import com.sun.net.httpserver.HttpServer;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Stream;
 import org.json.JSONObject;
@@ -120,6 +120,7 @@ public abstract class PathHandler implements HttpHandler {
 		}
 
 		public static boolean sendContent(HttpExchange ex, Object o) throws IOException {
+			if (o instanceof Map map) o = new JSONObject(map);
 			if (o instanceof JSONObject) ex.getResponseHeaders().add(CONTENT_TYPE, JSON);
 			return sendContent(ex, HTTP_OK, o.toString().getBytes(UTF_8));
 		}
@@ -131,4 +132,9 @@ public abstract class PathHandler implements HttpHandler {
 		public static boolean sendError(HttpExchange ex, Object o) throws IOException {
 			return sendContent(ex, HTTP_BAD_REQUEST, o.toString().getBytes(UTF_8));
 		}
+
+		public static boolean sendRedirect(HttpExchange ex, String url) throws IOException {
+			ex.getResponseHeaders().add("Location", url);
+			return sendEmptyResponse(HTTP_MOVED_TEMP, ex);
+		}
 	}

de.srsoftware.oidc.app/src/main/java/de/srsoftware/oidc/app/Application.java

@@ -49,11 +49,11 @@ public class Application {
 		var tokens = new ArrayList<>(List.of(args));
 		var map    = new HashMap<String, Object>();
 		while (!tokens.isEmpty()) {
-			var token = tokens.removeFirst();
+			var token = tokens.remove(0);
 			switch (token) {
 				case "--base":
 					if (tokens.isEmpty()) throw new IllegalArgumentException("--path option requires second argument!");
-					map.put(BASE_PATH, Path.of(tokens.removeFirst()));
+					map.put(BASE_PATH, Path.of(tokens.remove(0)));
 					break;
 				default:
 					System.err.printf("Unknown option: %s\n", token);

de.srsoftware.oidc.backend/src/main/java/de/srsoftware/oidc/backend/Backend.java

@@ -39,11 +39,16 @@ public class Backend extends PathHandler {
 	}
 
 	private boolean authorize(HttpExchange ex, Session session) throws IOException {
-		var json     = json(ex);
-		var clientId = json.getString(CLIENT_ID);
+		var json      = json(ex);
+		var clientId  = json.getString(CLIENT_ID);
+		var optClient = clients.getClient(clientId);
+		if (optClient.isEmpty()) return sendEmptyResponse(HTTP_NOT_FOUND, ex);
+		var client   = optClient.get();
 		var redirect = json.getString(REDIRECT_URI);
-		System.out.println(json);
-		return sendEmptyResponse(HTTP_NOT_FOUND, ex);
+		if (!client.redirectUris().contains(redirect)) return sendEmptyResponse(HTTP_BAD_REQUEST, ex);
+		var state = json.getString(STATE);
+		var code  = client.generateCode();
+		return sendContent(ex, Map.of(CODE,code,REDIRECT_URI,redirect,STATE,state));
 	}
 
 	private boolean clients(HttpExchange ex, Session session) throws IOException {
@@ -117,6 +122,8 @@ public class Backend extends PathHandler {
 		switch (path) {
 			case "/login":
 				return doLogin(ex);
+			case "/token":
+				return provideToken(ex);
 		}
 		var optSession = getSession(ex);
 		if (optSession.isEmpty()) return sendEmptyResponse(HTTP_UNAUTHORIZED, ex);
@@ -164,17 +171,23 @@ public class Backend extends PathHandler {
 		return sendEmptyResponse(HTTP_OK, ex);
 	}
 
-	private boolean openidConfig(HttpExchange ex) throws IOException {
-		JSONObject json = new JSONObject();
-
-		json.put("authorization_endpoint", hostname(ex) + "/web/authorization.html");
-		return sendContent(ex, json);
+	private boolean provideToken(HttpExchange ex) throws IOException {
+		System.err.printf("%s.provideToken(ex) not implemented!\n",getClass().getSimpleName());
+		var json = json(ex);
+		System.err.println(json);
+		return sendEmptyResponse(HTTP_NOT_FOUND,ex);
 	}
 
+	private boolean openidConfig(HttpExchange ex) throws IOException {
+		return sendContent(ex, Map.of(
+				"token_endpoint",hostname(ex)+"/api/token",
+				"authorization_endpoint", hostname(ex) + "/web/authorization.html")
+		);
+	}
 
 	private boolean sendUserAndCookie(HttpExchange ex, Session session) throws IOException {
 		new SessionToken(session.id()).addTo(ex);
-		return sendContent(ex, new JSONObject(session.user().map(false)));
+		return sendContent(ex, session.user().map(false));
 	}
 
 	private boolean updatePassword(HttpExchange ex, Session session) throws IOException {
@@ -193,7 +206,7 @@ public class Backend extends PathHandler {
 			return sendError(ex, "password mismatch");
 		}
 		users.updatePassword(user, newPass1);
-		return sendContent(ex, new JSONObject(user.map(false)));
+		return sendContent(ex, user.map(false));
 	}
 
 	private boolean updateUser(HttpExchange ex, Session session) throws IOException {
@@ -206,7 +219,6 @@ public class Backend extends PathHandler {
 		user.username(json.getString(USERNAME));
 		user.email(json.getString(EMAIL));
 		users.save(user);
-		JSONObject response = new JSONObject(user.map(false));
-		return sendContent(ex, response);
+		return sendContent(ex, user.map(false));
 	}
 }

de.srsoftware.oidc.web/src/main/java/de/srsoftware/oidc/web/Forward.java

@@ -16,8 +16,6 @@ public class Forward extends PathHandler {
 	@Override
 	public boolean doGet(String path, HttpExchange ex) throws IOException {
 		System.out.printf("Forwarding (%d) %s to %s…\n", CODE, path, toPath);
-		ex.getResponseHeaders().add("Location", toPath);
-		ex.sendResponseHeaders(CODE, 0);
-		return true;
+		return sendRedirect(ex,toPath);
 	}
 }

de.srsoftware.oidc.web/src/main/resources/en/authorization.html

@@ -5,8 +5,10 @@
     <script src="common.js"></script>
     <script src="user.js"></script>
     <script src="authorization.js"></script>
+    <link rel="stylesheet" href="style.css" />
 </head>
 <body>
+<nav></nav>
 <h1>Authorization!</h1>
 Not implemented, yet!
 </body>

de.srsoftware.oidc.web/src/main/resources/en/authorization.js

@@ -1,11 +1,19 @@
 var params = new URLSearchParams(window.location.search)
 var json = Object.fromEntries(params);
 
+async function handleResponse(response){
+    if (response.ok){
+        var json = await response.json();
+        console.log(json);
+        redirect(json.redirect_uri+'?code='+json.code+'&state='+json.state);
+        return;
+    }
+}
+
 fetch(api+"/authorize",{
     method: 'POST',
     body: JSON.stringify(json),
     headers: {
         'Content-Type': 'application/json'
     }
-})
-
+}).then(handleResponse);

de.srsoftware.oidc.web/src/main/resources/en/user.js

@@ -1,7 +1,7 @@
 var user = null;
 async function handleUser(response){
     if (response.status == UNAUTHORIZED) {
-        redirect('login.html?return_to='+encodeURI(window.location.href));
+        redirect('login.html?return_to='+encodeURIComponent(window.location.href));
         return;
     }
     if (response.ok){