implemented markdown renderer in backend and frontend

markdown/build.gradle.kts

@@ -0,0 +1,6 @@
+description = "Umbrella : MarkdownCompanies renderer"
+
+dependencies{
+    implementation(project(":core"))
+    implementation("de.srsoftware:tools.mime:1.1.2")
+}

markdown/src/main/java/de/srsoftware/umbrella/markdown/MarkdownApi.java

@@ -0,0 +1,40 @@
+package de.srsoftware.umbrella.markdown;
+
+import com.sun.net.httpserver.HttpExchange;
+import de.srsoftware.tools.Path;
+import de.srsoftware.tools.SessionToken;
+import de.srsoftware.umbrella.core.BaseHandler;
+import de.srsoftware.umbrella.core.Util;
+import de.srsoftware.umbrella.core.api.UserService;
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+import de.srsoftware.umbrella.core.model.Token;
+
+import java.io.IOException;
+import java.util.Optional;
+
+import static de.srsoftware.tools.MimeType.MIME_HTML;
+
+public class MarkdownApi extends BaseHandler {
+
+	private final UserService users;
+
+	public MarkdownApi(UserService userService) {
+		users = userService;
+	}
+
+	@Override
+	public boolean doPost(Path path, HttpExchange ex) throws IOException {
+		try {
+			addCors(ex);
+			Optional<Token> token = SessionToken.from(ex).map(Token::of);
+			var user = users.loadUser(token);
+
+			if (user.isEmpty()) throw UmbrellaException.forbidden("You must be logged in to use the markdown renderer!");
+			var rendered = Util.markdown(body(ex));
+			ex.getResponseHeaders().add(CONTENT_TYPE,MIME_HTML);
+			return sendContent(ex,rendered);
+		} catch (UmbrellaException e){
+			return send(ex,e);
+		}
+	}
+}