implemented cookies, implemented local file delivery option (--base /path/to/static/content), refactoring static files

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

de.srsoftware.cookies/build.gradle

@@ -0,0 +1,19 @@
+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'
+}
+
+test {
+    useJUnitPlatform()
+}

de.srsoftware.cookies/src/main/java/de/srsoftware/cookies/Cookie.java

@@ -0,0 +1,48 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.cookies;
+
+import com.sun.net.httpserver.Headers;
+import com.sun.net.httpserver.HttpExchange;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+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;
+	}
+
+	protected static Optional<List<String>> of(HttpExchange ex) {
+		return Optional.ofNullable(ex.getRequestHeaders().get("Cookie"));
+	}
+
+	@Override
+	public String setValue(String s) {
+		var oldVal = value;
+		value      = s;
+		return oldVal;
+	}
+}

de.srsoftware.cookies/src/main/java/de/srsoftware/cookies/SessionToken.java

@@ -0,0 +1,24 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.cookies;
+
+
+import com.sun.net.httpserver.HttpExchange;
+import java.util.List;
+import java.util.Optional;
+
+public class SessionToken extends Cookie {
+	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).orElseGet(List::of).stream().filter(cookie -> cookie.startsWith("sessionToken=")).map(cookie -> cookie.split("=", 2)[1]).map(id -> new SessionToken(id)).findAny();
+	}
+
+	public String sessionId() {
+		return sessionId;
+	}
+}