blog-software-java/src/main/java/eu/m724/blog/Server.java

package eu.m724.blog;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;

public class Server implements HttpHandler {
    private final Path webroot;
    private InetSocketAddress listenAddress;

    public Server(Path webroot, InetSocketAddress listenAddress) {
        this.webroot = webroot;
        this.listenAddress = listenAddress;
    }

    public Server(Path webroot) {
        this(webroot, new InetSocketAddress("localhost", 0));
    }

    public void start() throws IOException {
        var server = HttpServer.create(listenAddress, 0);
        server.createContext("/", this);
        server.start();

        System.out.println("Server started on http:/" + server.getAddress());

        this.listenAddress = server.getAddress();
    }

    public void openBrowser() {
        try {
            var process = Runtime.getRuntime().exec(new String[] { "xdg-open", "http://" + listenAddress.getHostString() + ":" + listenAddress.getPort() });
            var code = process.waitFor();
            if (code != 0) {
                throw new Exception("Exit code " + code);
            }
            System.out.println("Opened browser");
        } catch (Exception e) {
            System.out.println("Failed to open browser: " + e);
        }
    }

    @Override
    public void handle(HttpExchange exchange) throws IOException {
        var path = webroot.resolve(exchange.getRequestURI().getPath().substring(1));

        if (Files.isDirectory(path)) {
            path = path.resolve("index.html");
        }

        var code = 404;
        var content = "Not found".getBytes(StandardCharsets.UTF_8);

        if (Files.isRegularFile(path)) {
            code = 200;
            content = Files.readAllBytes(path);
        }

        exchange.sendResponseHeaders(code, content.length);

        var body = exchange.getResponseBody();
        body.write(content);
        body.close();
    }
}