basic http server

~3h work

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+.idea/

mtcg.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/Main.java

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+import at.nanopenguin.mtcg.http.Router;
+import at.nanopenguin.mtcg.http.Server;
+
+import java.io.IOException;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        System.out.println("Hello world!");
+        Server server = new Server(10001, 10, new Router());
+        server.start();
+    }
+}

src/at/nanopenguin/mtcg/http/HttpStatus.java

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+package at.nanopenguin.mtcg.http;
+
+public enum HttpStatus {
+    OK(200, "OK"),
+    CREATED(201, "Created"),
+    NO_CONTENT(204, "No Content"),
+    BAD_REQUEST(400, "Bad Request"),
+    UNAUTHORIZED(401, "Unauthorized"),
+    FORBIDDEN(403, "Forbidden"),
+    NOT_FOUND(404, "Not Found"),
+    CONFLICT(409, "Conflict"),
+    TEAPOT(418, "I'm a teapot"),
+    INTERNAL(500, "Internal Server Error"),
+    NOT_IMPLEMENTED(501, "Not Implemented");
+
+    public final int statusCode;
+    public final String statusMessage;
+
+    HttpStatus(int code, String message) {
+        this.statusCode = code;
+        this.statusMessage = message;
+    }
+}

src/at/nanopenguin/mtcg/http/RequestHandler.java

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+package at.nanopenguin.mtcg.http;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.Socket;
+
+public class RequestHandler implements Runnable {
+    private final Socket serviceSocket;
+    private final Router router;
+    private BufferedReader br;
+    private OutputStream out;
+
+    public RequestHandler(Socket serviceSocket, Router router) {
+        this.serviceSocket = serviceSocket;
+        this.router = router;
+    }
+
+    @Override
+    public void run() {
+        try {
+            Response response = new Response(HttpStatus.OK, "application/json", "[]");
+
+            this.out = this.serviceSocket.getOutputStream();
+            out.write(response.get().getBytes());
+            out.flush();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

src/at/nanopenguin/mtcg/http/Response.java

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+package at.nanopenguin.mtcg.http;
+
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class Response {
+    private final HttpStatus httpStatus;
+    private final String contentType;
+    private final String content;
+
+    public Response(HttpStatus httpStatus, String contentType, String content) {
+        this.httpStatus = httpStatus;
+        this.contentType = contentType;
+        this.content = content;
+    }
+
+    public String get() {
+
+        String localDatetime = DateTimeFormatter.RFC_1123_DATE_TIME.format(ZonedDateTime.now(ZoneId.of("UTC")));
+        return "HTTP/1.1 " + this.httpStatus.statusCode + " " + this.httpStatus.statusMessage + "\r\n" +
+                "Cache-Control: max-age=0\r\n" +
+                "Connection: close\r\n" +
+                "Date: " + localDatetime + "\r\n" +
+                "Expires: " + localDatetime + "\r\n" +
+                "Content-Type: " + this.contentType + "\r\n" +
+                "Content-Length: " + this.content.length() + "\r\n" +
+                "\r\n" +
+                this.content;
+    }
+}

src/at/nanopenguin/mtcg/http/Router.java

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+package at.nanopenguin.mtcg.http;
+
+public class Router {
+}

src/at/nanopenguin/mtcg/http/Server.java

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+package at.nanopenguin.mtcg.http;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class Server {
+    private final int port; // 16-bit unsigned, not enforced
+    private final int threads;
+    private final Router router;
+
+    public Server(int port, int threads, Router router) {
+        this.port = port;
+        this.threads = threads;
+        this.router = router;
+    }
+
+    public void  start() throws IOException {
+        try (ServerSocket listener = new ServerSocket(this.port)) {
+
+            ExecutorService executorService = Executors.newFixedThreadPool(this.threads);
+
+            System.out.println("HTTP server running on http://localhost:" + this.port);
+
+            while (true) {
+                final Socket serviceSocket = listener.accept();
+                final RequestHandler requestHandler = new RequestHandler(serviceSocket, this.router);
+
+                executorService.submit(requestHandler);
+
+            }
+        }
+    }
+}