jeena/datakom-labb
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

added HTTP version check and If-Modified-Since

Browse source
This commit is contained in:
Jeena Paradies 2010-11-11 17:20:37 +01:00
parent 026902fa86
commit e11d5c0e8f
1 changed files with 72 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

88
WebServer.java
View file

@ -8,6 +8,9 @@ import java.io.*;
import java.net.*;
import java.util.*;
import java.net.InetAddress.*;
import java.text.SimpleDateFormat;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public final class WebServer
{
@ -75,11 +78,12 @@ final class HttpRequest implements Runnable
final static class HttpResponse
{
final static String OK = HTTP_VERSION + " 200 OK " + CRLF;
final static String NOT_FOUND = HTTP_VERSION + " 404 Not Found " + CRLF;
final static String BAD_REQUEST = HTTP_VERSION + " 400 Bad Request " + CRLF;
final static String INTERNAL_SERVER_ERROR = HTTP_VERSION + " 500 Internal Server Error " + CRLF;
final static String NOT_IMPLEMENTED = HTTP_VERSION + " 501 Not Implemented " + CRLF;
final static String OK = HTTP_VERSION + " 200 OK" + CRLF;
final static String NOT_MODIFIED = HTTP_VERSION + " 304 Not Modified" + CRLF;
final static String NOT_FOUND = HTTP_VERSION + " 404 Not Found" + CRLF;
final static String BAD_REQUEST = HTTP_VERSION + " 400 Bad Request" + CRLF;
final static String INTERNAL_SERVER_ERROR = HTTP_VERSION + " 500 Internal Server Error" + CRLF;
final static String NOT_IMPLEMENTED = HTTP_VERSION + " 501 Not Implemented" + CRLF;
}
private Socket socket;
@ -143,6 +147,21 @@ final class HttpRequest implements Runnable
// Get the request line of the HTTP request
String requestLine = br.readLine();
// get headers
String h = null;
Map<String, String> headers = new HashMap<String, String>();
while (true) {
h = br.readLine();
if (h.length() == 0) break;
String[] a = h.split(":", 2);
if (a != null && a.length == 2 && a[0] != null && a[0].length() > 0 && a[1] != null && a[1].length() > 1) {
headers.put(a[0].toLowerCase().trim(), a[1].trim());
}
}
if (requestLine == null) {
WebServer.errLog("Request is empty");
return;
@ -154,14 +173,28 @@ final class HttpRequest implements Runnable
// split on ASCII 32
String[] tokens = requestLine.split(" ");
String Request = tokens[0];
if(tokens.length != 3 || tokens[0].length() == 0 || tokens[1].length() == 0 || tokens[2].length() == 0) {
String request = tokens[0];
boolean isAHTTPVersion = false;
if (tokens.length == 3 && tokens[2].length() > 7) {
Pattern pattern = Pattern.compile("HTTP/\\d\\.\\d");
Matcher matcher = pattern.matcher(tokens[2]);
isAHTTPVersion = matcher.find();
}
if(tokens.length != 3 || tokens[0].length() == 0 || tokens[1].length() == 0 || tokens[2].length() == 0 || !isAHTTPVersion) {
WebServer.errLog("Wrong number of arguments in request!");
sendHeader(HttpResponse.BAD_REQUEST);
sendText("<h1>400 Bas Request</h1>");
sendText("<h1>400 Bad Request</h1>");
} else if(!tokens[2].equals("HTTP/1.0")) {
sendHeader(HttpResponse.NOT_IMPLEMENTED);
sendText("<h1>501 Not Implemented</h1>");
} else if(tokens[1].charAt(0) != '/') {
WebServer.errLog("Illegal URI");
@ -169,20 +202,43 @@ final class HttpRequest implements Runnable
sendHeader(HttpResponse.NOT_IMPLEMENTED);
sendText("<h1>501 Not Implemented</h1>");
} else if((Request.equals(HttpMethod.GET) || Request.equals(HttpMethod.HEAD)) && tokens[2].equals(HTTP_VERSION)) {
} else if((request.equals(HttpMethod.GET) || request.equals(HttpMethod.HEAD)) && tokens[2].equals(HTTP_VERSION)) {
FileInputStream filein;
try {
File f = new File("." + tokens[1]);
filein = new FileInputStream(f);
sendHeader(HttpResponse.OK, f);
if(Request.equals(HttpMethod.GET)) {
sendBytes(filein, outs);
// check if the file has been modified since
boolean modifiedSince = headers.containsKey("if-modified-since");
if (modifiedSince) {
String dateString = headers.get("if-modified-since");
SimpleDateFormat format = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz");
Date date = format.parse(dateString);
Date modified = new Date(f.lastModified());
modifiedSince = modified.after(date);
}
if (!modifiedSince) {
sendHeader(HttpResponse.NOT_MODIFIED);
sendText("<h1>304 Not Modified</h1>");
} else {
filein = new FileInputStream(f);
sendHeader(HttpResponse.OK, f);
if(request.equals(HttpMethod.GET)) {
sendBytes(filein, outs);
}
}
} catch (FileNotFoundException e) {
sendHeader(HttpResponse.NOT_FOUND);
@ -190,7 +246,7 @@ final class HttpRequest implements Runnable
}
} else if(Request.equals(HttpMethod.POST)) {
} else if(request.equals(HttpMethod.POST)) {
sendHeader(HttpResponse.NOT_IMPLEMENTED);
sendText("<h1>501 Not Implemented</h1>");