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annotate src/goodjava/webserver/handlers/FileHandler.java @ 1604:8a7519dee55c

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FileHandler handles if-modified-since
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 16 Apr 2021 19:19:39 -0600
parents 27efb1fcbcb5
children fa066aaa068c
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1 package goodjava.webserver.handlers;
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2
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3 import java.io.File;
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4 import java.io.FileInputStream;
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5 import java.io.IOException;
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6 import java.text.DateFormat;
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7 import java.text.SimpleDateFormat;
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8 import java.text.ParseException;
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9 import java.util.Date;
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10 import java.util.TimeZone;
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11 import goodjava.webserver.Handler;
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12 import goodjava.webserver.Request;
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13 import goodjava.webserver.Response;
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14 import goodjava.webserver.Status;
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16
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17 public class FileHandler implements Handler {
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18 final File dir;
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19
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20 public FileHandler() {
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21 this(".");
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22 }
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23
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24 public FileHandler(String pathname) {
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25 this(new File(pathname));
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26 }
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28 public FileHandler(File dir) {
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29 if( !dir.isDirectory() )
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30 throw new RuntimeException("must be a directory");
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31 this.dir = dir;
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32 }
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33
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34 File file(Request request) {
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35 return new File(dir,request.path);
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36 }
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37
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38 public Response handle(Request request) {
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39 try {
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40 File file = file(request);
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41 if( file.isFile() ) {
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42 Response response = new Response();
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43
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44 DateFormat fmt = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z");
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45 fmt.setTimeZone(TimeZone.getTimeZone("GMT"));
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46 String lastModified = fmt.format(new Date(file.lastModified()));
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47 String ifMod = (String)request.headers.get("if-modified-since");
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48 if( ifMod != null ) {
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49 try {
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50 Date ifModDate = fmt.parse(ifMod);
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51 if( ifModDate != null && ifModDate.getTime() >= fmt.parse(lastModified).getTime() ) {
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52 response.status = Status.NOT_MODIFIED;
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53 return response;
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54 }
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55
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56 } catch(ParseException e) {}
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57 }
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58 response.headers.put("last-modified",lastModified);
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59
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60 response.body = new Response.Body( file.length(), new FileInputStream(file) );
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61 return response;
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62 }
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63 return null;
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64 } catch(IOException e) {
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65 throw new RuntimeException(e);
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66 }
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67 }
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68 }