working on backend:

- started FileStore implementation
- implemented placing cookies

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.api/build.gradle

@@ -11,6 +11,7 @@ repositories {
 dependencies {
     testImplementation platform('org.junit:junit-bom:5.10.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'
+    implementation 'org.json:json:20240303'
 }
 
 test {

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

@@ -0,0 +1,42 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.api;
+
+import com.sun.net.httpserver.Headers;
+import com.sun.net.httpserver.HttpExchange;
+import java.util.Map;
+
+public abstract class Cookie implements Map.Entry<String, String> {
+	private final String key;
+	private String	     value = null;
+
+	Cookie(String key, String value) {
+		this.key = key;
+		setValue(value);
+	}
+
+	public <T extends Cookie> T addTo(Headers headers) {
+		headers.add("Set-Cookie", "%s=%s".formatted(key, value));
+		return (T)this;
+	}
+
+	public <T extends Cookie> T addTo(HttpExchange ex) {
+		return this.addTo(ex.getResponseHeaders());
+	}
+
+	@Override
+	public String getKey() {
+		return key;
+	}
+
+	@Override
+	public String getValue() {
+		return value;
+	}
+
+	@Override
+	public String setValue(String s) {
+		var oldVal = value;
+		value      = s;
+		return oldVal;
+	}
+}

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

@@ -0,0 +1,11 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.api;
+
+public interface PasswordHasher<T> {
+	public String hash(String password, String salt);
+	public String salt(String hashedPassword);
+
+	public default boolean matches(String plaintextPassword, String hashedPassword) {
+		return hash(plaintextPassword, salt(hashedPassword)).equals(hashedPassword);
+	}
+}

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

@@ -1,6 +1,8 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.oidc.api;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import com.sun.net.httpserver.HttpExchange;
 import com.sun.net.httpserver.HttpHandler;
 import com.sun.net.httpserver.HttpServer;
@@ -9,10 +11,14 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
 import java.util.stream.Stream;
+import org.json.JSONObject;
 
 public abstract class PathHandler implements HttpHandler {
-	private String path;
+	public static final String CONTENT_TYPE = "Content-Type";
+	public static final String JSON	        = "application/json";
+	public static final String POST	        = "POST";
 
+	private String path;
 
 	public class Bond {
 		Bond(String p) {
@@ -35,15 +41,29 @@ public abstract class PathHandler implements HttpHandler {
 		return path;
 	}
 
-	public Optional<String> getHeader(HttpExchange ex, String key) {
+	/******* begin of static methods *************/
+
+	public static String body(HttpExchange ex) throws IOException {
+		return new String(ex.getRequestBody().readAllBytes(), UTF_8);
+	}
+
+	public static Optional<String> getAuthToken(HttpExchange ex) {
+		return getHeader(ex, "Authorization");
+	}
+
+	public static Optional<String> getHeader(HttpExchange ex, String key) {
 		return Optional.ofNullable(ex.getRequestHeaders().get(key)).map(List::stream).map(Stream::findFirst).orElse(Optional.empty());
 	}
 
-	public Optional<String> language(HttpExchange ex) {
+	public static JSONObject json(HttpExchange ex) throws IOException {
+		return new JSONObject(body(ex));
+	}
+
+	public static Optional<String> language(HttpExchange ex) {
 		return getHeader(ex, "Accept-Language").map(s -> Arrays.stream(s.split(","))).map(Stream::findFirst).orElse(Optional.empty());
 	}
 
-	public void emptyResponse(int statusCode, HttpExchange ex) throws IOException {
+	public static void sendEmptyResponse(int statusCode, HttpExchange ex) throws IOException {
 		ex.sendResponseHeaders(statusCode, 0);
 		ex.getResponseBody().close();
 	}

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

@@ -0,0 +1,9 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.api;
+
+
+public class SessionToken extends Cookie {
+	public SessionToken(String value) {
+		super("sessionToken", value);
+	}
+}

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

@@ -1,4 +1,90 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.oidc.api;
 
-public class User {}
+import java.util.Map;
+import java.util.Objects;
+
+public final class User {
+	public static final String EMAIL    = "email";
+	public static final String PASSWORD = "password";
+	public static final String REALNAME = "realname";
+	public static final String USERNAME = "username";
+
+	private String email, hashedPassword, realName, uuid, username;
+
+	public User(String username, String hashedPassword, String realName, String email, String uuid) {
+		this.username	    = username;
+		this.realName	    = realName;
+		this.email	    = email;
+		this.hashedPassword = hashedPassword;
+		this.uuid	    = uuid;
+	}
+
+	public String email() {
+		return email;
+	}
+
+	public User email(String newVal) {
+		email = newVal;
+		return this;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (obj == this) return true;
+		if (obj == null || obj.getClass() != this.getClass()) return false;
+		var that = (User)obj;
+		return Objects.equals(this.uuid, that.uuid);
+	}
+
+	public String hashedPassword() {
+		return hashedPassword;
+	}
+
+	public User hashedPassword(String newValue) {
+		hashedPassword = newValue;
+		return this;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(username, realName, email, hashedPassword, uuid);
+	}
+
+
+	public Map<String, String> map(boolean includePassword) {
+		return includePassword ? Map.of(USERNAME, username, REALNAME, realName, PASSWORD, hashedPassword, EMAIL, email) : Map.of(USERNAME, username, REALNAME, realName, EMAIL, email);
+	}
+
+	public String realName() {
+		return realName;
+	}
+
+	public User realName(String newValue) {
+		realName = newValue;
+		return this;
+	}
+
+	@Override
+	public String toString() {
+		return "User["
+		    + "username=" + username + ", "
+		    + "realName=" + realName + ", "
+		    + "email=" + email + ", "
+		    + "uuid=" + uuid + ']';
+	}
+
+	public String username() {
+		return username;
+	}
+
+	public User username(String newVal) {
+		username = newVal;
+		return this;
+	}
+
+
+	public String uuid() {
+		return uuid;
+	}
+}

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

@@ -0,0 +1,13 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.api;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface UserService {
+	public UserService    delete(User user);
+	public UserService    init(User defaultUser);
+	public List<User>     list();
+	public Optional<User> load(String username, String password);
+	public UserService    save(User user);
+}

de.srsoftware.oidc.app/build.gradle

@@ -15,6 +15,7 @@ dependencies {
     implementation project(':de.srsoftware.oidc.api')
     implementation project(':de.srsoftware.oidc.backend')
     implementation project(':de.srsoftware.oidc.web')
+    implementation project(':de.srsoftware.oidc.datastore.file')
 }
 
 test {

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

@@ -3,21 +3,35 @@ package de.srsoftware.oidc.app;
 
 
 import com.sun.net.httpserver.HttpServer;
+import de.srsoftware.oidc.api.User;
+import de.srsoftware.oidc.api.UserService;
 import de.srsoftware.oidc.backend.Backend;
+import de.srsoftware.oidc.datastore.file.FileStore;
+import de.srsoftware.oidc.datastore.file.UuidHasher;
 import de.srsoftware.oidc.web.Forward;
 import de.srsoftware.oidc.web.StaticPages;
+import java.io.File;
 import java.net.InetSocketAddress;
+import java.util.UUID;
 import java.util.concurrent.Executors;
 
 public class Application {
-	public static final String STATIC_PATH = "/web";
-	public static final String INDEX       = STATIC_PATH + "/index.html";
+	public static final String STATIC_PATH     = "/web";
+	public static final String FIRST_USER      = "admin";
+	public static final String FIRST_USER_PASS = "admin";
+	public static final String FIRST_UUID      = UUID.randomUUID().toString();
+	public static final String INDEX           = STATIC_PATH + "/index.html";
 
 	public static void main(String[] args) throws Exception {
-		HttpServer server = HttpServer.create(new InetSocketAddress(8080), 0);
+		var         storageFile    = new File("/tmp/lightoidc.json");
+		var         passwordHasher = new UuidHasher();
+		var         firstHash      = passwordHasher.hash(FIRST_USER_PASS, FIRST_UUID);
+		var         firstUser      = new User(FIRST_USER, firstHash, FIRST_USER, "%s@internal".formatted(FIRST_USER), FIRST_UUID);
+		UserService userService    = new FileStore(storageFile, passwordHasher).init(firstUser);
+		HttpServer  server         = HttpServer.create(new InetSocketAddress(8080), 0);
 		new StaticPages().bindPath(STATIC_PATH).on(server);
 		new Forward(INDEX).bindPath("/").on(server);
-		new Backend().bindPath("/api").on(server);
+		new Backend(userService).bindPath("/api").on(server);
 		server.setExecutor(Executors.newCachedThreadPool());
 		server.start();
 	}

de.srsoftware.oidc.backend/build.gradle

@@ -13,6 +13,7 @@ dependencies {
     testImplementation platform('org.junit:junit-bom:5.10.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'
     implementation project(':de.srsoftware.oidc.api')
+    implementation 'org.json:json:20240303'
 }
 
 test {

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

@@ -1,28 +1,56 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.oidc.backend;
 
+import static de.srsoftware.oidc.api.User.PASSWORD;
+import static de.srsoftware.oidc.api.User.USERNAME;
 import static java.net.HttpURLConnection.HTTP_NOT_FOUND;
 import static java.net.HttpURLConnection.HTTP_UNAUTHORIZED;
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static java.util.jar.Attributes.Name.CONTENT_TYPE;
 
 import com.sun.net.httpserver.HttpExchange;
 import de.srsoftware.oidc.api.PathHandler;
+import de.srsoftware.oidc.api.SessionToken;
+import de.srsoftware.oidc.api.User;
+import de.srsoftware.oidc.api.UserService;
 import java.io.IOException;
 import java.util.Optional;
+import org.json.JSONObject;
 
 public class Backend extends PathHandler {
+	private final UserService users;
+
+	public Backend(UserService userService) {
+		users = userService;
+	}
+
+	private void doLogin(HttpExchange ex) throws IOException {
+		var body = json(ex);
+
+		var username = body.has(USERNAME) ? body.getString(USERNAME) : null;
+		var password = body.has(PASSWORD) ? body.getString(PASSWORD) : null;
+
+		Optional<User> user = users.load(username, password);
+		if (user.isPresent()) {
+			sendUserAndCookie(ex, user.get());
+			return;
+		}
+		sendEmptyResponse(HTTP_UNAUTHORIZED, ex);
+	}
+
 	@Override
 	public void handle(HttpExchange ex) throws IOException {
 		String path   = relativePath(ex);
 		String method = ex.getRequestMethod();
 		System.out.printf("%s %s…", method, path);
 
-		if ("login".equals(path)) {
-			doLogin(ex); // TODO: prevent brute force
+		if ("login".equals(path) && POST.equals(method)) {
+			doLogin(ex);  // TODO: prevent brute force
 			return;
 		}
 		var token = getAuthToken(ex);
 		if (token.isEmpty()) {
-			emptyResponse(HTTP_UNAUTHORIZED, ex);
+			sendEmptyResponse(HTTP_UNAUTHORIZED, ex);
 			System.err.println("unauthorized");
 			return;
 		}
@@ -31,14 +59,13 @@ public class Backend extends PathHandler {
 		ex.getResponseBody().close();
 	}
 
-	private void doLogin(HttpExchange ex) throws IOException {
-		Optional<String> user = getHeader(ex, "login-username");
-		Optional<String> pass = getHeader(ex, "login-password");
-		System.out.printf("%s : %s", user, pass);
-		emptyResponse(HTTP_UNAUTHORIZED, ex);
-	}
+	private void sendUserAndCookie(HttpExchange ex, User user) throws IOException {
+		var bytes   = new JSONObject(user.map(false)).toString().getBytes(UTF_8);
+		var headers = ex.getResponseHeaders();
 
-	private Optional<String> getAuthToken(HttpExchange ex) {
-		return getHeader(ex, "Authorization");
+		headers.add(CONTENT_TYPE, JSON);
+		new SessionToken("Test").addTo(headers);
+		ex.sendResponseHeaders(200, bytes.length);
+		ex.getResponseBody().write(bytes);
 	}
 }

de.srsoftware.oidc.datastore.file/build.gradle

@@ -0,0 +1,21 @@
+plugins {
+    id 'java'
+}
+
+group = 'de.srsoftware'
+version = '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation platform('org.junit:junit-bom:5.10.0')
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+    implementation project(':de.srsoftware.oidc.api')
+    implementation 'org.json:json:20240303'
+}
+
+test {
+    useJUnitPlatform()
+}

de.srsoftware.oidc.datastore.file/src/main/java/de/srsoftware/oidc/datastore/file/FileStore.java

@@ -0,0 +1,87 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.datastore.file; /* © SRSoftware 2024 */
+import static de.srsoftware.oidc.api.User.*;
+
+import de.srsoftware.oidc.api.PasswordHasher;
+import de.srsoftware.oidc.api.User;
+import de.srsoftware.oidc.api.UserService;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Optional;
+import org.json.JSONObject;
+
+public class FileStore implements UserService {
+	private static final String USERS = "users";
+
+	private final Path       storageFile;
+	private final JSONObject json;
+	private final PasswordHasher<String> passwordHasher;
+
+	public FileStore(File storage, PasswordHasher<String> passwordHasher) throws IOException {
+		this.storageFile    = storage.toPath();
+		this.passwordHasher = passwordHasher;
+
+		if (!storage.exists()) {
+			var parent = storage.getParentFile();
+			if (!parent.exists() && !parent.mkdirs()) throw new FileNotFoundException("Failed to create directory %s".formatted(parent));
+			Files.writeString(storageFile, "{}");
+		}
+		json = new JSONObject(Files.readString(storageFile));
+	}
+
+	@Override
+	public Optional<User> load(String username, String password) {
+		try {
+			var users = json.getJSONObject(USERS);
+			var uuids = users.keySet();
+			for (String uuid : uuids) {
+				var user = users.getJSONObject(uuid);
+				if (!user.getString(USERNAME).equals(username)) continue;
+				var hashedPass = user.getString(PASSWORD);
+				if (passwordHasher.matches(password, hashedPass)) {
+					return Optional.of(new User(username, hashedPass, user.getString(REALNAME), user.getString(EMAIL), uuid));
+				}
+			}
+			return Optional.empty();
+		} catch (Exception e) {
+			return Optional.empty();
+		}
+	}
+
+	@Override
+	public UserService delete(User user) {
+		return null;
+	}
+
+	@Override
+	public UserService init(User defaultUser) {
+		if (!json.has(USERS)) save(defaultUser);
+		return this;
+	}
+
+	@Override
+	public UserService save(User user) {
+		JSONObject users;
+		if (!json.has(USERS)) {
+			json.put(USERS, users = new JSONObject());
+		} else
+			users = json.getJSONObject(USERS);
+		users.put(user.uuid(), user.map(true));
+		try {
+			Files.writeString(storageFile, json.toString(2));
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+		return this;
+	}
+
+
+	@Override
+	public List<User> list() {
+		return List.of();
+	}
+}

de.srsoftware.oidc.datastore.file/src/main/java/de/srsoftware/oidc/datastore/file/UuidHasher.java

@@ -0,0 +1,39 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.datastore.file;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import de.srsoftware.oidc.api.PasswordHasher;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+
+public class UuidHasher implements PasswordHasher<String> {
+	private static final String SHA256 = "SHA-256";
+
+	private final MessageDigest digest;
+
+	public UuidHasher() throws NoSuchAlgorithmException {
+		digest = MessageDigest.getInstance(SHA256);
+	}
+
+	@Override
+	public String hash(String password, String uuid) {
+		var salt       = uuid;
+		var saltedPass = "%s %s".formatted(salt, password);
+		var bytes      = digest.digest(saltedPass.getBytes(UTF_8));
+
+		return "%s@%s".formatted(hex(bytes), salt);
+	}
+
+	@Override
+	public String salt(String hashedPassword) {
+		return hashedPassword.split("@")[1];
+	}
+
+	public static String hex(byte[] bytes) {
+		StringBuilder sb = new StringBuilder(bytes.length * 2);
+		for (byte b : bytes) sb.append(String.format("%02x", b));
+		return sb.toString();
+	}
+}

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

@@ -28,7 +28,7 @@ public class StaticPages extends PathHandler {
 			System.out.printf("Loading %s for lagnuage %s…", path, lang);
 			var response = loadTemplate(lang, path).orElseThrow(() -> new FileNotFoundException());
 
-			ex.getResponseHeaders().add("Content-Type", response.contentType);
+			ex.getResponseHeaders().add(CONTENT_TYPE, response.contentType);
 			ex.sendResponseHeaders(200, response.content.length);
 			OutputStream os = ex.getResponseBody();
 			os.write(response.content);

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

@@ -33,11 +33,11 @@ function tryLogin(){
     document.getElementById("error").innerHTML = "";
     var data = Object.fromEntries(new FormData(document.getElementById('login')));
     fetch(api+"/login",{
+        method: 'POST',
         headers: {
-          'login-username': data.user,
-          'login-password': data.pass, // TODO: send via body?
           Accept: 'application/json',
           'Content-Type': 'application/json'
-        }
+        },
+        body: JSON.stringify(data)
     }).then(handleLogin);
 }

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

@@ -11,11 +11,11 @@
                 <legend>User credentials</legend>
             <label>
                 Username
-                <input type="text" name="user" />
+                <input type="text" name="username" />
             </label>
             <label>
                 Password
-                <input type="password" name="pass" />
+                <input type="password" name="password" />
             </label>
             <button type="button" onClick="tryLogin()">Login</button>
             </fieldset>

settings.gradle

@@ -3,4 +3,5 @@ include 'de.srsoftware.oidc.api'
 include 'de.srsoftware.oidc.app'
 include 'de.srsoftware.oidc.web'
 include 'de.srsoftware.oidc.backend'
+include 'de.srsoftware.oidc.datastore.file'