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annotate src/luan/lib/webserver/handlers/ContentTypeHandler.java @ 1370:ba4fc39423a4

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 23 Jun 2019 19:50:55 -0600
parents 643cf1c37723
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 package luan.lib.webserver.handlers;
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2
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3 import java.util.Map;
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4 import java.util.HashMap;
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5 import luan.lib.webserver.Handler;
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6 import luan.lib.webserver.Request;
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7 import luan.lib.webserver.Response;
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10 public class ContentTypeHandler implements Handler {
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11 private final Handler handler;
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12
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13 // maps extension to content-type
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14 // key must be lower case
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15 public final Map<String,String> map = new HashMap<String,String>();
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16
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17 // set to null for none
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18 public String contentTypeForNoExtension;
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19
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20 public ContentTypeHandler(Handler handler) {
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21 this(handler,"utf-8");
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22 }
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23
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24 public ContentTypeHandler(Handler handler,String charset) {
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25 this.handler = handler;
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26 String attrs = charset== null ? "" : "; charset="+charset;
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27 String htmlType = "text/html" + attrs;
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28 String textType = "text/plain" + attrs;
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29 contentTypeForNoExtension = htmlType;
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30 map.put( "html", htmlType );
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31 map.put( "txt", textType );
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32 map.put( "css", "text/css" );
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33 map.put( "mp4", "video/mp4" );
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34 // add more as need
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35 }
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36
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37 public Response handle(Request request) {
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38 Response response = handler.handle(request);
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39 if( response!=null && !response.headers.containsKey("content-type") ) {
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40 String path = request.path;
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41 int iSlash = path.lastIndexOf('/');
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42 int iDot = path.lastIndexOf('.');
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43 String type;
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44 if( iDot < iSlash ) { // no extension
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45 type = contentTypeForNoExtension;
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46 } else { // extension
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47 String extension = path.substring(iDot+1);
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48 type = map.get( extension.toLowerCase() );
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49 }
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50 if( type != null )
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51 response.headers.put("content-type",type);
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52 }
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53 return response;
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54 }
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55 }