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 = 8080;

mimeTypes = new HashMap();
        initMimeTypes();

System.out.println("Rava Web Server");
        System.out.println("Serving current directory on port " + port);
        System.out.println("Press Ctrl+C to stop\n");

ServerSocket server = new ServerSocket(port);

while (true) {
            Socket client = server.accept();
            handleRequest(client);
        }
    }

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");

// Scan current directory for any other extensions
        File dir = new File(".");
        String[] files = dir.list();
        if (files != null) {
            for (int i = 0; i < files.length; i++) {
                String name = files[i];
                int dot = name.lastIndexOf(".");
                if (dot > 0) {
                    String ext = name.substring(dot);
                    if (!mimeTypes.containsKey(ext)) {
                        mimeTypes.put(ext, "application/octet-stream");
                    }
                }
            }
        }
    }

static void handleRequest(Socket client) {
        if (client == null) return;

var input = client.getInputStream();
        var output = client.getOutputStream();

if (input == null || output == null) {
            client.close();
            return;
        }

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

String path = extractPath(request);
        if (path == null) path = "/";
        System.out.println("GET " + path);

consumeHeaders(input);

if (path.equals("/")) {
            File dir = new File(".");
            File index = new File("./index.html");
            if (index.exists()) {
                serveFile(output, index);
            } else {
                serveDirectory(output, dir, "/");
            }
        } else {
            File file = new File("." + path);
            if (file.exists()) {
                if (file.isDirectory()) {
                    File index = new File(file.getPath() + "/index.html");
                    if (index.exists()) {
                        serveFile(output, index);
                    } else {
                        serveDirectory(output, file, path);
                    }
                } else {
                    serveFile(output, file);
                }
            } else {
                serve404(output, path);
            }
        }

client.close();
    }

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

static void consumeHeaders(SocketInputStream input) {
        while (true) {
            String line = input.readLine();
            if (line == null) break;
            if (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: ");
        resp.append(type);
        resp.append("\r\n");
        resp.append("Content-Length: ");
        resp.append(content.length());
        resp.append("\r\n");
        resp.append("Connection: close\r\n");
        resp.append("\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><head><title>Index of ");
        html.append(urlPath);
        html.append("</title>");
        html.append("<style>");
        html.append("body{font-family:monospace;margin:20px}");
        html.append("a{text-decoration:none;color:#0066cc}");
        html.append("a:hover{text-decoration:underline}");
        html.append(".d{font-weight:bold}");
        html.append("table{border-collapse:collapse}");
        html.append("td{padding:4px 16px 4px 4px}");
        html.append("</style></head><body>");
        html.append("<h1>Index of ");
        html.append(urlPath);
        html.append("</h1><hr><table>");

if (!urlPath.equals("/")) {
            html.append("<tr><td class=\"d\"><a href=\"..\">..</a></td><td>-</td></tr>");
        }

var files = dir.listFiles();
        if (files != null) {
            for (int i = 0; i < files.length; i++) {
                var f = files[i];
                String name = f.getName();
                String href = urlPath.endsWith("/") ? urlPath + name : urlPath + "/" + name;

html.append("<tr><td");
                if (f.isDirectory()) {
                    html.append(" class=\"d\"><a href=\"");
                    html.append(href);
                    html.append("/\">");
                    html.append(name);
                    html.append("/</a></td><td>-</td>");
                } else {
                    html.append("><a href=\"");
                    html.append(href);
                    html.append("\">");
                    html.append(name);
                    html.append("</a></td><td>");
                    html.append(f.length());
                    html.append(" B</td>");
                }
                html.append("</tr>");
            }
        }

html.append("</table><hr><p><i>Rava Web Server</i></p></body></html>");

String body = html.toString();

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

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

static void serve404(SocketOutputStream out, String path) {
        String body = "<html><head><title>404 Not Found</title></head>";
        body = body + "<body><h1>404 Not Found</h1><p>" + path + "</p></body></html>";

StringBuilder resp = new StringBuilder();
        resp.append("HTTP/1.1 404 Not Found\r\n");
        resp.append("Content-Type: text/html\r\n");
        resp.append("Content-Length: ");
        resp.append(body.length());
        resp.append("\r\n");
        resp.append("Connection: close\r\n");
        resp.append("\r\n");
        resp.append(body);

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

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

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);
            }
        } else {
            if (mimeTypes.containsKey(name)) {
                return (String)mimeTypes.get(name);
            }
        }
        return "application/octet-stream";
    }
}

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