Cleanup, refactoring.

src/main/java/ch/fritteli/labyrinth/server/LabyrinthServer.java

@@ -1,10 +1,9 @@
 package ch.fritteli.labyrinth.server;
 
 import ch.fritteli.labyrinth.server.handler.CreateHandler;
-import ch.fritteli.labyrinth.server.undertow_playground.LanyrinthRenderHandler;
+import ch.fritteli.labyrinth.server.handler.LanyrinthRenderHandler;
 import io.undertow.Undertow;
 import io.undertow.server.RoutingHandler;
-import io.undertow.server.handlers.RedirectHandler;
 import io.undertow.util.StatusCodes;
 import io.vavr.control.Try;
 import lombok.NonNull;
@@ -17,30 +16,27 @@ public class LabyrinthServer {
     @NonNull
     private final Undertow undertow;
 
-    public static Try<LabyrinthServer> createAndStartServer() {
-        final Try<LabyrinthServer> serverOption = Try.of(ServerConfig::init).mapTry(LabyrinthServer::new);
-        serverOption.forEach(LabyrinthServer::start);
-        return serverOption;
-    }
-
     private LabyrinthServer(@NonNull final ServerConfig config) {
         log.info("Starting Server at http://{}:{}/", config.getAddress().getHostAddress(), config.getPort());
-        final RoutingHandler routingHandler = new RoutingHandler().get("/", new RedirectHandler("/create/text"))
+        final RoutingHandler routingHandler = new RoutingHandler().get(CreateHandler.PATH_TEMPLATE, new CreateHandler())
-                                                                  .get("/create", new RedirectHandler("/create/text"))
-                                                                  .get("/create/{output}", new CreateHandler())
                 .post("/render", new LanyrinthRenderHandler())
-                                                                  .setFallbackHandler(exchange -> {
+                .setFallbackHandler(exchange -> exchange.setStatusCode(
-                                                                      exchange.setStatusCode(StatusCodes.NOT_FOUND)
+                                StatusCodes.NOT_FOUND)
                         .getResponseSender()
                         .send("Resource %s not found".formatted(
-                                                                                      exchange.getRequestURI()));
+                                exchange.getRequestURI())));
-                                                                  });
         this.undertow = Undertow.builder()
                 .addHttpListener(config.getPort(), config.getAddress().getHostAddress())
                 .setHandler(routingHandler)
                 .build();
     }
 
+    public static Try<LabyrinthServer> createAndStartServer() {
+        final Try<LabyrinthServer> serverOption = Try.of(ServerConfig::init).mapTry(LabyrinthServer::new);
+        serverOption.forEach(LabyrinthServer::start);
+        return serverOption;
+    }
+
     private void start() {
         Runtime.getRuntime().addShutdownHook(new Thread(this::stop, "listener-stopper"));
         this.undertow.start();

src/main/java/ch/fritteli/labyrinth/server/StaticResourcesFileHandler.java

@@ -1,109 +0,0 @@
-package ch.fritteli.labyrinth.server;
-
-import com.sun.net.httpserver.HttpExchange;
-import com.sun.net.httpserver.HttpHandler;
-import lombok.NonNull;
-import lombok.extern.slf4j.Slf4j;
-import org.apache.pdfbox.io.IOUtils;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.net.URI;
-import java.nio.charset.StandardCharsets;
-import java.util.concurrent.ExecutorService;
-
-@Slf4j
-public class StaticResourcesFileHandler implements HttpHandler {
-
-    public static final String WEBASSETS_DIRECTORY = "webassets";
-    private final ExecutorService executorService;
-
-    public StaticResourcesFileHandler(final ExecutorService executorService) {
-        this.executorService = executorService;
-        log.debug("Created {}", this.getClass().getSimpleName());
-    }
-
-    @Override
-    public void handle(@NonNull final HttpExchange exchange) throws IOException {
-        this.executorService.submit(() -> {
-            try {
-                final URI requestURI = exchange.getRequestURI();
-                final String path = requestURI.getPath();
-                log.debug("Handling request to {}", path);
-                if ("/".equals(path)) {
-                    redirect(exchange, "index.html");
-                    return;
-                }
-                if (!path.startsWith("/")) {
-                    notFound(exchange, path);
-                    return;
-                }
-                final String mimeType = getMimeType(path);
-                if (mimeType == null) {
-                    notFound(exchange, path);
-                    return;
-                }
-                final byte[] responseBytes = getBytes(path);
-                if (responseBytes.length == 0) {
-                    notFound(exchange, path);
-                    return;
-                }
-                log.debug(
-                        "Serving {}{} with mimetype {}: {} bytes",
-                        WEBASSETS_DIRECTORY,
-                        path,
-                        mimeType,
-                        responseBytes.length
-                );
-                exchange.getResponseHeaders().add("Content-type", mimeType);
-                exchange.sendResponseHeaders(200, 0);
-                exchange.getResponseBody().write(responseBytes);
-                exchange.getResponseBody().flush();
-            } catch (Exception e) {
-                log.error("FSCK!", e);
-            } finally {
-                exchange.close();
-            }
-        });
-    }
-
-    private static void redirect(@NonNull final HttpExchange exchange, @NonNull final String target) throws
-                                                                                                     IOException {
-        log.debug("Sending redirect to {}", target);
-        exchange.getResponseHeaders().add("Location", target);
-        exchange.sendResponseHeaders(302, -1);
-    }
-
-    private static void notFound(@NonNull final HttpExchange exchange, @NonNull final String path) throws IOException {
-        log.debug("Resource '{}' not found, replying with HTTP 404", path);
-        exchange.getResponseHeaders().add("Content-type", "text/plain; charset=utf-8");
-        exchange.sendResponseHeaders(404, 0);
-        exchange.getResponseBody().write("404 - Not found".getBytes(StandardCharsets.UTF_8));
-        exchange.getResponseBody().flush();
-    }
-
-    @Nullable
-    private static String getMimeType(@NonNull final String path) {
-        if (path.endsWith(".html")) {
-            return "text/html";
-        }
-        if (path.endsWith(".css")) {
-            return "text/css";
-        }
-        return null;
-    }
-
-    @NonNull
-    private static byte[] getBytes(@NonNull final String path) throws IOException {
-        final InputStream stream = StaticResourcesFileHandler.class.getClassLoader()
-                                                                   .getResourceAsStream(WEBASSETS_DIRECTORY + path);
-        if (stream == null) {
-            log.debug("Resource '{}' not found in classpath.", path);
-            return new byte[0];
-        }
-        final byte[] response = IOUtils.toByteArray(stream);
-        log.debug("Sending reply; {} bytes", response.length);
-        return response;
-    }
-}

src/main/java/ch/fritteli/labyrinth/server/handler/CreateHandler.java

@@ -2,14 +2,18 @@ package ch.fritteli.labyrinth.server.handler;
 
 import ch.fritteli.labyrinth.generator.model.Labyrinth;
 import ch.fritteli.labyrinth.server.OutputType;
-import ch.fritteli.labyrinth.server.handler.AbstractHttpHandler;
-import ch.fritteli.labyrinth.server.undertow_playground.UndertowPlayground;
 import io.undertow.server.HttpServerExchange;
 import io.undertow.util.Headers;
 import io.undertow.util.HttpString;
+import io.undertow.util.StatusCodes;
+import io.vavr.Tuple;
+import io.vavr.Tuple2;
+import io.vavr.collection.*;
 import io.vavr.control.Option;
+import io.vavr.control.Try;
 import lombok.NonNull;
 import lombok.extern.slf4j.Slf4j;
+import org.jetbrains.annotations.Nullable;
 
 import java.nio.ByteBuffer;
 import java.util.Deque;
@@ -18,26 +22,69 @@ import java.util.Random;
 
 @Slf4j
 public class CreateHandler extends AbstractHttpHandler {
-    @Override
+    public static final String PATH_TEMPLATE = "/create/{output}";
-    protected void handle(@NonNull final HttpServerExchange exchange) throws Exception {
-        final Map<String, Deque<String>> queryParameters = exchange.getQueryParameters();
-        final Option<String> output = UndertowPlayground.getFirstOption(queryParameters, "output");
-        final Option<Integer> width = UndertowPlayground.getIntOption(queryParameters, "width");
-        final Option<Integer> height = UndertowPlayground.getIntOption(queryParameters, "height");
-        final Option<Integer> id = UndertowPlayground.getIntOption(queryParameters, "id");
 
-        log.info("Output: {}", output);
+    @Override
-        log.info("Width:  {}", width);
+    protected void handle(@NonNull final HttpServerExchange exchange) {
-        log.info("Height: {}", height);
+        this.createLabyrinthFromRequestParameters(exchange.getQueryParameters())
-        log.info("Id:     {}", id);
+                .onFailure(e -> {
-        final Integer theId = id.getOrElse(() -> new Random().nextInt());
+                    exchange.setStatusCode(StatusCodes.INTERNAL_SERVER_ERROR);
-        final Labyrinth labyrinth = new Labyrinth(width.get(), height.get(), theId);
+                    exchange.setReasonPhrase(e.getMessage());
-        final OutputType outputType = output.flatMap(OutputType::ofString).get();
+                }).forEach(tuple -> {
-        final byte[] result = outputType.render(labyrinth);
+                    final OutputType outputType = tuple._1();
+                    final Labyrinth labyrinth = tuple._2();
+                    final byte[] bytes = outputType.render(labyrinth);
                     exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, outputType.getContentType());
-        exchange.getResponseHeaders().put(HttpString.tryFromString("X-Labyrinth-ID"), String.valueOf(theId));
+                    exchange.getResponseHeaders().put(HttpString.tryFromString("X-Labyrinth-ID"), String.valueOf(labyrinth.getRandomSeed()));
-        exchange.getResponseHeaders().put(HttpString.tryFromString("X-Labyrinth-Width"), String.valueOf(width.get()));
+                    exchange.getResponseHeaders().put(HttpString.tryFromString("X-Labyrinth-Width"), String.valueOf(labyrinth.getWidth()));
-        exchange.getResponseHeaders().put(HttpString.tryFromString("X-Labyrinth-Height"), String.valueOf(height.get()));
+                    exchange.getResponseHeaders().put(HttpString.tryFromString("X-Labyrinth-Height"), String.valueOf(labyrinth.getHeight()));
-        exchange.getResponseSender().send(ByteBuffer.wrap(result));
+                    exchange.getResponseSender().send(ByteBuffer.wrap(bytes));
+                });
+    }
+
+    private @NonNull Try<Tuple2<OutputType, Labyrinth>> createLabyrinthFromRequestParameters(final Map<String, Deque<String>> queryParameters) {
+        return new ParametersToLabyrinthExtractor(queryParameters).createLabyrinth();
+    }
+
+    private enum RequestParameter {
+        WIDTH("w", "width"), HEIGHT("h", "height"), ID("i", "id"), OUTPUT("o", "output");
+        private final Set<String> names;
+
+        RequestParameter(@NonNull final String... names) {
+            this.names = HashSet.of(names);
+        }
+
+        static Option<RequestParameter> parseName(@Nullable final String name) {
+            if (name == null) {
+                return Option.none();
+            }
+            return Stream.of(values()).find(param -> param.names.exists(name::equalsIgnoreCase));
+        }
+    }
+
+    private static class ParametersToLabyrinthExtractor {
+        @NonNull
+        private final Multimap<String, String> queryParameters;
+
+        ParametersToLabyrinthExtractor(@NonNull final Map<String, Deque<String>> queryParameters) {
+            this.queryParameters = HashMap.ofAll(queryParameters).foldLeft(HashMultimap.<String>withSet().empty(), (map, tuple) -> {
+                final String key = tuple._1();
+                return Stream.ofAll(tuple._2()).foldLeft(map, (m, value) -> m.put(key, value));
+            });
+        }
+
+        @NonNull Try<Tuple2<OutputType, Labyrinth>> createLabyrinth() {
+            final Option<OutputType> output = getParameterValues(RequestParameter.OUTPUT).foldLeft(Option.none(), (type, param) -> type.orElse(() -> OutputType.ofString(param)));
+            final Option<Integer> width = getParameterValues(RequestParameter.WIDTH).foldLeft(Option.none(), (value, param) -> value.orElse(() -> Try.of(() -> Integer.parseInt(param)).toOption()));
+            final Option<Integer> height = getParameterValues(RequestParameter.HEIGHT).foldLeft(Option.none(), (value, param) -> value.orElse(() -> Try.of(() -> Integer.parseInt(param)).toOption()));
+            final Option<Long> id = getParameterValues(RequestParameter.ID).foldLeft(Option.none(), (value, param) -> value.orElse(() -> Try.of(() -> Long.parseLong(param)).toOption()));
+
+            return Try.of(() -> Tuple.of(output.get(), new Labyrinth(width.get(), height.get(), id.getOrElse(() -> new Random().nextLong()))));
+        }
+
+        @NonNull
+        private Stream<String> getParameterValues(@NonNull final RequestParameter parameter) {
+            return parameter.names.toStream().flatMap(name -> Stream.ofAll(this.queryParameters.getOrElse(name, List.empty())));
+        }
     }
 }

src/main/java/ch/fritteli/labyrinth/server/handler/LanyrinthRenderHandler.java

@@ -1,4 +1,4 @@
-package ch.fritteli.labyrinth.server.undertow_playground;
+package ch.fritteli.labyrinth.server.handler;
 
 import io.undertow.server.HttpHandler;
 import io.undertow.server.HttpServerExchange;

src/main/java/ch/fritteli/labyrinth/server/undertow_playground/UndertowPlayground.java

@@ -1,28 +0,0 @@
-package ch.fritteli.labyrinth.server.undertow_playground;
-
-import io.undertow.server.HttpHandler;
-import io.undertow.server.HttpServerExchange;
-import io.undertow.server.RoutingHandler;
-import io.undertow.util.HeaderValues;
-import io.undertow.util.Headers;
-import io.vavr.control.Option;
-import lombok.NonNull;
-import lombok.extern.slf4j.Slf4j;
-
-import java.util.Deque;
-import java.util.Map;
-
-@Slf4j
-public class UndertowPlayground {
-    @NonNull
-    public static Option<Integer> getIntOption(@NonNull final Map<String, Deque<String>> queryParams,
-                                                @NonNull final String paramName) {
-        return getFirstOption(queryParams, paramName).toTry().map(Integer::parseInt).toOption();
-    }
-
-    @NonNull
-    public static Option<String> getFirstOption(@NonNull final Map<String, Deque<String>> queryParams,
-                                                 @NonNull final String paramName) {
-        return Option.of(queryParams.get(paramName)).map(Deque::peek).flatMap(Option::of);
-    }
-}

src/main/resources/logback.xml

@@ -13,5 +13,5 @@
     <root level="info">
         <appender-ref ref="STDOUT"/>
     </root>
-    <logger name="ch.fritteli.labyrinth.server.StaticResourcesFileHandler" level="debug"/>
+    <logger name="ch.fritteli.labyrinth.server.handler.CreateHandler" level="debug"/>
 </configuration>