package net.unternet.jc;
import eve.sys.Vm;
import java.net.*;
import java.io.*;
import eve.zipfile.ZipFile;
public class HTTPServer {
 public static int PORT = 8000;
 public static int BACKLOG = 5;  // how many connections we can listen for
 public static void serve() {
  ServerSocket httpServer = null;
  Socket connection = null;
  try {
   httpServer = new ServerSocket(PORT, BACKLOG);
  } catch (IOException fatal) {
   System.err.println("Cannot start server: " + fatal);
   Vm.exit(1);
  }
  while (true) {
   try {
    connection = httpServer.accept();
   } catch (IOException nonfatal) {
    System.err.println("Cannot accept connection: " + nonfatal);
   }
   handle(connection);
   try {connection.close();} catch (IOException ignored) {}
  }
 }
 public static void handle(Socket connection) {
  DataInputStream input = null;
  String line = "", filename = null;
  try {
   input = new DataInputStream(connection.getInputStream());
  } catch (IOException problem) {
   System.err.println("Cannot get input stream: " + problem);
   return;
  }
  while (true) {
   try {
    line = input.readLine();
    if (line == null) throw new IOException("null received");
    if (line.length() == 0) throw new IOException("end of headers");
   } catch (IOException eof) {  // could be something else, but treat as EOF
    System.err.println("EOF found: " + eof);
    line = null;
    break;  // out of "while" loop
   }
   System.err.println("got line: " + line);
   if (line.substring(0, 4).equalsIgnoreCase("GET ")) {
    filename = line.substring(4, line.indexOf(' ', 4));
   }
  }
  if (filename != null) sendfile(connection, filename);
 }
 public static String contentType(String filename) {
  String mimetype = "text/html";  // default
  if (filename.endsWith(".txt")) mimetype = "text/plain";
  else if (filename.endsWith(".jpg")) mimetype = "image/jpeg";
  else if (filename.endsWith(".png")) mimetype = "image/png";
  else if (filename.endsWith(".gif")) mimetype = "image/gif";
  return "Content-type: " + mimetype;
 }
 public static void sendfile(Socket connection, String filename) {
  DataOutputStream output = null;
  String fileContents = null;
  try {
   output = new DataOutputStream(connection.getOutputStream());
  } catch (Exception nonfatal) {
   System.err.println("Could not get output stream: " + nonfatal);
  }
  if (output != null) try {
   fileContents = getZipFile(filename);
   if (fileContents == null) {
    output.writeBytes("HTTP/0.9 404 Not Found\r\n");
    return;
   } else {
    output.writeBytes("HTTP/0.9 200 OK\r\n");
    output.writeBytes(contentType(filename) + "\r\n\r\n");
    output.writeBytes(fileContents);
   }
  } catch (Exception nonfatal) {
   System.err.println("Cannot write output: " + nonfatal);
  }
 }
 public static String getZipFile(String filename) {
  ZipFile zipfile = null;
  InputStream input = null;
  String contents = "";
  byte[] buffer = new byte[4096];
  int count = 0;
  if (filename.equals("/")) filename = "/index.html";
  while (filename.startsWith("/")) filename = filename.substring(1);
  System.err.println("trying to open Zip file");
  try {
   zipfile = new ZipFile(Vm.openResourceAsRandomStream(null,
    "net/unternet/jc/_filesystem.zip"));
  } catch (Exception fatal) {
   System.err.println("Cannot open _filesystem.zip: " + fatal);
   Vm.exit(1);
  }
  System.err.println("trying to fetch \"" + filename + "\" from Zip file");
  try {
   input = zipfile.getInputStream(zipfile.getEntry(filename));
  } catch (Exception fatal) {
   System.err.println("Could not get " + filename + " contents: " + fatal);
   return null;
  }
  System.err.println("trying to read \"" + filename + "\"");
  try {
   while ((count = input.read(buffer)) > 0) {
    System.err.println("read " + count + " bytes into buffer");
    contents += new String(buffer, 0, count);
    System.err.println("contents now " + contents.length() + " bytes long");
   }
  } catch (Exception nonfatal) {
   System.err.println("error during file read: " + nonfatal);
  }
  if (filename.endsWith(".html")) {
   System.err.println("returning contents: " + contents);
  } else {
   System.err.println("returning contents with length: " + contents.length());
  }
  return contents;
 }
 public static void main(String[] args) {
  Vm.startEve(args);
  serve();
  System.err.println("Server started");
 }
}