Rava2 - Java Source Interpreter

import java.io.File;
import java.io.FileReader;
import java.io.BufferedReader;
import java.util.HashMap;

public class Main {
    static HashMap mimeTypes;

public static void main(String[] args) {
        int port = 8081;

mimeTypes = new HashMap();
        initMimeTypes();

System.out.println("Rava Multithreaded Web Server");
        System.out.println("Serving current directory on port " + port);
        System.out.println("Each request runs in its own thread.\n");

ServerSocket server = new ServerSocket(port);

while (true) {
            Socket client = server.accept();
            if (client != null) {
                // Create a new thread for each client
                Thread handler = new Thread(() -> {
                    handleRequest(client);
                });
                handler.start();
            }
        }
    }

static void initMimeTypes() {
        mimeTypes.put(".html", "text/html");
        mimeTypes.put(".css", "text/css");
        mimeTypes.put(".js", "application/javascript");
        mimeTypes.put(".json", "application/json");
        mimeTypes.put(".txt", "text/plain");
        mimeTypes.put(".java", "text/plain");
        mimeTypes.put(".c", "text/x-csrc");
        mimeTypes.put(".h", "text/x-chdr");
        mimeTypes.put(".md", "text/markdown");
        mimeTypes.put(".sh", "application/x-sh");
        mimeTypes.put(".xml", "application/xml");
        mimeTypes.put(".png", "image/png");
        mimeTypes.put(".jpg", "image/jpeg");
        mimeTypes.put(".gif", "image/gif");
        mimeTypes.put(".ico", "image/x-icon");
        mimeTypes.put(".o", "application/octet-stream");
        mimeTypes.put("Makefile", "text/plain");
    }

static void handleRequest(Socket client) {
        try {
            var input = client.getInputStream();
            var output = client.getOutputStream();

String request = input.readLine();
            if (request == null || request.length() == 0) {
                client.close();
                return;
            }

String path = extractPath(request);
            if (path == null) path = "/";
            
            // Note: System.out is synchronized in Rava
            System.out.println("[" + Thread.currentThread().getName() + "] GET " + path);

consumeHeaders(input);

if (path.equals("/")) {
                serveDirectory(output, new File("."), "/");
            } else {
                File file = new File("." + path);
                if (file.exists()) {
                    if (file.isDirectory()) {
                        serveDirectory(output, file, path);
                    } else {
                        serveFile(output, file);
                    }
                } else {
                    serve404(output, path);
                }
            }
        } finally {
            client.close();
        }
    }

static String extractPath(String request) {
        int start = request.indexOf(" ");
        if (start < 0) return "/";
        int end = request.indexOf(" ", start + 1);
        if (end < 0) return request.substring(start + 1);
        return request.substring(start + 1, end);
    }

static void consumeHeaders(SocketInputStream input) {
        while (true) {
            String line = input.readLine();
            if (line == null || line.length() == 0) break;
        }
    }

static void serveFile(SocketOutputStream out, File file) {
        String content = readFile(file);
        String type = getContentType(file.getName());

StringBuilder resp = new StringBuilder();
        resp.append("HTTP/1.1 200 OK\r\n");
        resp.append("Content-Type: ").append(type).append("\r\n");
        resp.append("Content-Length: ").append(content.length()).append("\r\n");
        resp.append("Connection: close\r\n\r\n");
        resp.append(content);

out.write(resp.toString());
    }

static void serveDirectory(SocketOutputStream out, File dir, String urlPath) {
        StringBuilder html = new StringBuilder();
        html.append("<html><body><h1>Index of ").append(urlPath).append("</h1><hr><ul>");

var files = dir.list();
        if (files != null) {
            for (int i = 0; i < files.length; i++) {
                String name = files[i];
                html.append("<li><a href=\"").append(name).append("\">\”").append(name).append("</a></li>");
            }
        }
        html.append("</ul></body></html>");

String body = html.toString();
        StringBuilder resp = new StringBuilder();
        resp.append("HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n");
        resp.append("Content-Length: ").append(body.length()).append("\r\n");
        resp.append("Connection: close\r\n\r\n").append(body);

out.write(resp.toString());
    }

static void serve404(SocketOutputStream out, String path) {
        String body = "<html><body><h1>404 Not Found</h1><p>" + path + "</p></body></html>";
        out.write("HTTP/1.1 404 Not Found\r\nContent-Type: text/html\r\nContent-Length: " + body.length() + "\r\n\r\n" + body);
    }

static String readFile(File file) {
        try {
            StringBuilder sb = new StringBuilder();
            BufferedReader br = new BufferedReader(new FileReader(file.getPath()));
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line).append("\n");
            }
            br.close();
            return sb.toString();
        } catch (Exception e) {
            return "";
        }
    }

static String getContentType(String name) {
        int dot = name.lastIndexOf(".");
        if (dot > 0) {
            String ext = name.substring(dot);
            if (mimeTypes.containsKey(ext)) return (String)mimeTypes.get(ext);
        }
        return "application/octet-stream";
    }
}

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