started to implement sessions

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

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

@@ -3,6 +3,7 @@ package de.srsoftware.oidc.api;
 
 import com.sun.net.httpserver.Headers;
 import com.sun.net.httpserver.HttpExchange;
+import java.util.List;
 import java.util.Map;
 
 public abstract class Cookie implements Map.Entry<String, String> {
@@ -33,6 +34,10 @@ public abstract class Cookie implements Map.Entry<String, String> {
 		return value;
 	}
 
+	protected static List<String> of(HttpExchange ex) {
+		return ex.getRequestHeaders().get("Cookie");
+	}
+
 	@Override
 	public String setValue(String s) {
 		var oldVal = value;

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

@@ -0,0 +1,7 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.api;
+
+import java.time.Instant;
+
+public record Session(User user, Instant expiration, String id) {
+}

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

@@ -0,0 +1,13 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.api;
+
+import java.time.Duration;
+import java.util.Optional;
+
+public interface SessionService {
+	Session	  createSession(User user);
+	SessionService	  dropSession(String sessionId);
+	Session	  extend(String sessionId);
+	Optional<Session> retrieve(String sessionId);
+	SessionService	  setDuration(Duration duration);
+}

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

@@ -2,8 +2,22 @@
 package de.srsoftware.oidc.api;
 
 
+import com.sun.net.httpserver.HttpExchange;
+import java.util.Optional;
+
 public class SessionToken extends Cookie {
-	public SessionToken(String value) {
-		super("sessionToken", value);
+	private final String sessionId;
+
+	public SessionToken(String sessionId) {
+		super("sessionToken", sessionId);
+		this.sessionId = sessionId;
+	}
+
+	public static Optional<SessionToken> from(HttpExchange ex) {
+		return Cookie.of(ex).stream().filter(cookie -> cookie.startsWith("sessionToken=")).map(cookie -> cookie.split("=", 2)[1]).map(id -> new SessionToken(id)).findAny();
+	}
+
+	public String sessionId() {
+		return sessionId;
 	}
 }

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

@@ -5,9 +5,10 @@ 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);
+	public UserService	 delete(User user);
+	public UserService	 init(User defaultUser);
+	public List<User>	 list();
+	public Optional<User>	 load(String id);
+	public Optional<User>	 load(String username, String password);
+	public <T extends UserService> T save(User user);
 }