started to implement sessions

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

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

@@ -2,24 +2,28 @@
 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 de.srsoftware.oidc.api.*;
 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 java.time.Duration;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.*;
 import org.json.JSONObject;
 
-public class FileStore implements UserService {
-	private static final String USERS = "users";
+public class FileStore implements SessionService, UserService {
+	private static final String EXPIRATION = "expiration";
+	private static final String SESSIONS   = "sessions";
+	private static final String USERS      = "users";
+	private static final String USER       = "user";
 
 	private final Path       storageFile;
 	private final JSONObject json;
 	private final PasswordHasher<String> passwordHasher;
+	private Duration	     sessionDuration = Duration.of(10, ChronoUnit.MINUTES);
 
 	public FileStore(File storage, PasswordHasher<String> passwordHasher) throws IOException {
 		this.storageFile    = storage.toPath();
@@ -33,6 +37,47 @@ public class FileStore implements UserService {
 		json = new JSONObject(Files.readString(storageFile));
 	}
 
+	private FileStore save() {
+		try {
+			Files.writeString(storageFile, json.toString(2));
+			return this;
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	/*** User Service Methods ***/
+
+
+	@Override
+	public UserService delete(User user) {
+		return null;
+	}
+
+	@Override
+	public FileStore init(User defaultUser) {
+		if (!json.has(SESSIONS)) json.put(SESSIONS, new JSONObject());
+		if (!json.has(USERS)) save(defaultUser);
+		return this;
+	}
+
+	@Override
+	public List<User> list() {
+		return List.of();
+	}
+
+
+	@Override
+	public Optional<User> load(String userId) {
+		try {
+			var users = json.getJSONObject(USERS);
+			var user  = users.getJSONObject(userId);
+			return Optional.of(new User(user.getString(USERNAME), user.getString(PASSWORD), user.getString(REALNAME), user.getString(EMAIL), userId));
+		} catch (Exception ignored) {
+		}
+		return Optional.empty();
+	}
+
 	@Override
 	public Optional<User> load(String username, String password) {
 		try {
@@ -53,35 +98,59 @@ public class FileStore implements UserService {
 	}
 
 	@Override
-	public UserService delete(User user) {
+	public FileStore 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));
+		return save();
+	}
+
+	/*** Session Service Methods ***/
+
+	@Override
+	public Session createSession(User user) {
+		var now	 = Instant.now();
+		var endOfSession = now.plus(sessionDuration);
+		return save(new Session(user, endOfSession, UUID.randomUUID().toString()));
+	}
+
+	@Override
+	public SessionService dropSession(String sessionId) {
 		return null;
 	}
 
 	@Override
-	public UserService init(User defaultUser) {
-		if (!json.has(USERS)) save(defaultUser);
-		return this;
+	public Session extend(String sessionId) {
+		return null;
 	}
 
 	@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));
+	public Optional<Session> retrieve(String sessionId) {
+		var sessions = json.getJSONObject(SESSIONS);
 		try {
-			Files.writeString(storageFile, json.toString(2));
-		} catch (IOException e) {
-			throw new RuntimeException(e);
+			var session    = sessions.getJSONObject(sessionId);
+			var userId     = session.getString(USER);
+			var expiration = Instant.ofEpochSecond(session.getLong(EXPIRATION));
+			if (expiration.isAfter(Instant.now())) {
+				return load(userId).map(user -> new Session(user, expiration, sessionId));
+			}
+		} catch (Exception ignored) {
 		}
-		return this;
+		return Optional.empty();
 	}
 
+	private Session save(Session session) {
+		json.getJSONObject(SESSIONS).put(session.id(), Map.of(USER, session.user().uuid(), EXPIRATION, session.expiration().getEpochSecond()));
+		save();
+		return session;
+	}
 
 	@Override
-	public List<User> list() {
-		return List.of();
+	public SessionService setDuration(Duration duration) {
+		return null;
 	}
 }