1 package de.halbekunst.juplo.cachecontrol;
3 import java.io.IOException;
4 import java.io.OutputStream;
5 import java.io.OutputStreamWriter;
6 import java.io.PrintWriter;
7 import java.text.ParseException;
8 import java.text.SimpleDateFormat;
9 import java.util.Collections;
10 import java.util.Enumeration;
11 import java.util.HashMap;
12 import java.util.Locale;
14 import java.util.zip.GZIPOutputStream;
15 import javax.servlet.Filter;
16 import javax.servlet.FilterChain;
17 import javax.servlet.FilterConfig;
18 import javax.servlet.ServletException;
19 import javax.servlet.ServletOutputStream;
20 import javax.servlet.ServletRequest;
21 import javax.servlet.ServletResponse;
22 import javax.servlet.http.Cookie;
23 import javax.servlet.http.HttpServletRequest;
24 import javax.servlet.http.HttpServletResponse;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
27 import org.springframework.beans.factory.annotation.Autowire;
28 import org.springframework.beans.factory.annotation.Autowired;
29 import org.springframework.beans.factory.annotation.Configurable;
30 import org.springframework.beans.factory.annotation.Qualifier;
38 @Configurable(autowire=Autowire.BY_NAME)
39 public class AcceleratorFilter implements Filter {
40 private final static Logger log = LoggerFactory.getLogger(AcceleratorFilter.class);
42 private final static Map<String,String> EMPTY = Collections.unmodifiableMap(new HashMap<String,String>());
44 public final static Integer DEFAULT_BUFFER_SIZE = 1024;
45 public final static String REQUEST_URI_ATTRIBUTE = "javax.servlet.include.request_uri";
46 public final static String RESPONSE_WRAPPER = AcceleratorFilter.class.getName() + ".RESPONSE_WRAPPER";
49 @Autowired CacheControl cacheControl;
50 @Autowired(required=false) @Qualifier("defaultBufferSize") Integer defaultBufferSize = DEFAULT_BUFFER_SIZE;
51 @Autowired String eTag;
52 @Autowired Boolean weak;
53 @Autowired Long lastModified;
54 @Autowired Integer cacheSeconds;
58 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
59 if (!(request instanceof HttpServletRequest)) {
60 log.error("AcceleratorFilter can only handle HTTP-requests");
61 chain.doFilter(request, response);
65 // TODO: Das macht so wahrscheinlich keinen Sinn...
66 /** Prüfen, ob es sich um eine Anfrage für einen JSP-Include handelt */
67 if (request.getAttribute(REQUEST_URI_ATTRIBUTE) != null) {
68 log.debug("Includes cannot be accelerated");
69 chain.doFilter(request, response);
73 HttpServletRequest httpRequest = (HttpServletRequest)request;
74 HttpServletResponse httpResponse = (HttpServletResponse)response;
75 AccelerationWrapper wrapper = new AccelerationWrapper(httpRequest, httpResponse);
76 httpRequest.setAttribute(RESPONSE_WRAPPER, wrapper);
77 cacheControl.init(wrapper);
78 chain.doFilter(request, wrapper);
83 public void init(FilterConfig filterConfig) throws ServletException {
87 public void destroy() {
91 class AccelerationWrapper implements HttpServletResponse, CacheMethodHandle {
93 private final HttpServletRequest request;
94 private final HttpServletResponse response;
96 private final AcceleratorServletOutputStream out;
98 private ServletOutputStream stream;
99 private PrintWriter writer;
101 private boolean guessing = true;
102 protected boolean zipped = false; // << CacheControll greift direkt auf diese Variable zu!
106 private int cacheSeconds;
107 private boolean cacheSecondsSet = false;
108 private long lastModified, expires = 0l;
110 private boolean weak;
111 private Map<String,String> cacheParams;
113 /** Für den AcceleratorOutputStream */
114 private boolean committed = false;
115 private OutputStream os = null;
116 private int bufferSize;
117 private byte[] buffer;
119 private int size = 0;
123 AccelerationWrapper(HttpServletRequest request, HttpServletResponse response) throws IOException {
125 this.request = request;
126 this.response = response;
128 now = System.currentTimeMillis();
129 status = HttpServletResponse.SC_OK;
130 cacheSeconds = AcceleratorFilter.this.cacheSeconds;
131 lastModified = AcceleratorFilter.this.lastModified;
132 eTag = AcceleratorFilter.this.eTag;
133 weak = AcceleratorFilter.this.weak;
134 cacheParams = new HashMap<String,String>();
136 Enumeration values = request.getHeaders(Headers.HEADER_ACCEPT_ENCODING);
137 while (values.hasMoreElements()) {
138 String value = (String) values.nextElement();
139 if (value.indexOf("gzip") != -1) {
145 out = new AcceleratorServletOutputStream();
149 private void finish() throws IOException {
155 public void setStatus(int sc) {
156 response.setStatus(sc);
161 public void setStatus(int sc, String sm) {
162 response.setStatus(sc,sm);
167 public void addDateHeader(String name, long value) {
170 response.addDateHeader(name, value);
174 if (Headers.HEADER_DATE.equalsIgnoreCase(name)) {
176 calculateCacheSeconds();
180 if (Headers.HEADER_EXPIRES.equalsIgnoreCase(name)) {
182 calculateCacheSeconds();
186 if (Headers.HEADER_LAST_MODIFIED.equalsIgnoreCase(name)) {
187 lastModified = value;
191 /** Unknown header: pass throug! */
192 response.addDateHeader(name, value);
196 public void addHeader(String name, String value) {
199 response.addHeader(name, value);
205 analyzeHeader(name, value, false);
209 public void addIntHeader(String name, int value) {
212 response.addIntHeader(name, value);
216 analyzeHeader(name, Integer.toString(value), false);
220 public void setDateHeader(String name, long value) {
223 response.setDateHeader(name, value);
227 if (Headers.HEADER_DATE.equalsIgnoreCase(name)) {
229 calculateCacheSeconds();
233 if (Headers.HEADER_EXPIRES.equalsIgnoreCase(name)) {
235 calculateCacheSeconds();
239 if (Headers.HEADER_LAST_MODIFIED.equalsIgnoreCase(name)) {
240 lastModified = value;
244 /** Unknown header: pass throug! */
245 response.setDateHeader(name, value);
249 public void setHeader(String name, String value) {
252 response.setHeader(name, value);
256 analyzeHeader(name, value, true);
260 public void setIntHeader(String name, int value) {
263 response.setIntHeader(name, value);
267 analyzeHeader(name, Integer.toString(value), true);
271 public ServletOutputStream getOutputStream() throws IOException {
274 throw new IllegalStateException("ServletOutputStream and PrintWriter cannot be requested both!");
276 if (stream == null) {
284 public PrintWriter getWriter() throws IOException {
287 throw new IllegalStateException("ServletOutputStream and PrintWriter cannot be requested both!");
289 if (writer == null) {
290 writer = new PrintWriter(new OutputStreamWriter(out, response.getCharacterEncoding()));
297 public void setContentLength(int len) {
299 log.info("Supressing explicit content-length {} for request {}, because content will be zipped!", len, request.getRequestURI());
301 response.setContentLength(len);
305 public int getBufferSize() {
310 public void setBufferSize(int size) {
312 throw new IllegalStateException("cannot change buffer size, because content was already written!");
314 buffer = new byte[size];
318 public void resetBuffer() {
320 throw new IllegalStateException("cannot reset buffer, because response is already commited!");
327 public void reset() {
329 throw new IllegalStateException("cannot reset response, because response is already commited!");
331 * Da committed==false gilt, wurde die Dekoration noch nicht angestßen
332 * und muss entsprechend auch nicht rückgängig gemacht werden!
342 public void flushBuffer() throws IOException {
345 else if (stream != null)
352 public void addCookie(Cookie cookie) {
353 // TODO: Je nach Vary-Einstellung ETag anpassen?
354 response.addCookie(cookie);
358 public boolean containsHeader(String name) {
359 return response.containsHeader(name);
363 public String encodeURL(String url) {
364 return response.encodeURL(url);
368 public String encodeRedirectURL(String url) {
369 return response.encodeRedirectURL(url);
373 public String encodeUrl(String url) {
374 return response.encodeUrl(url);
378 public String encodeRedirectUrl(String url) {
379 return response.encodeRedirectUrl(url);
383 public void sendError(int sc, String msg) throws IOException {
384 response.sendError(sc,msg);
388 public void sendError(int sc) throws IOException {
389 response.sendError(sc);
393 public void sendRedirect(String location) throws IOException {
394 response.sendRedirect(location);
398 public String getCharacterEncoding() {
399 return response.getCharacterEncoding();
403 public String getContentType() {
404 return response.getContentType();
408 public void setCharacterEncoding(String charset) {
409 // TODO: Je nach Vary-Einstellung ETag anpassen?
410 response.setCharacterEncoding(charset);
414 public void setContentType(String type) {
415 // TODO: Je nach Vary-Einstellung ETag anpassen?
416 response.setContentType(type);
420 public boolean isCommitted() {
425 public void setLocale(Locale loc) {
426 // TODO: Je nach Vary-Einstellung ETag anpassen?
427 response.setLocale(loc);
431 public Locale getLocale() {
438 public boolean isZipped() {
443 public long getTimestamp() {
448 public int accepts(HttpServletRequest request) {
453 public int getCacheSeconds(HttpServletRequest request) {
458 public long getLastModified(HttpServletRequest request) {
463 public String getETag(HttpServletRequest request) {
468 public boolean isETagWeak() {
473 public void cacheControl(HttpServletRequest request, Map<String, String> cacheControlMap) {
474 cacheControlMap.putAll(cacheParams);
478 public Map<String,String> getAdditionalHeaders(HttpServletRequest request) {
482 public void supressGuessing() {
487 private void analyzeHeader(String name, String value, boolean overwrite) {
492 if (name.equalsIgnoreCase(Headers.HEADER_DATE)) {
495 now = System.currentTimeMillis();
496 cacheSeconds = AcceleratorFilter.this.cacheSeconds;
501 SimpleDateFormat parser = new SimpleDateFormat(Headers.RFC_1123_DATE_FORMAT, Locale.US);
502 now = parser.parse(value).getTime();
503 calculateCacheSeconds();
505 catch (ParseException e) {
506 log.warn("ignoring date for header \"Date\" in invalid format: {}", value);
511 if (name.equalsIgnoreCase(Headers.HEADER_EXPIRES)) {
515 cacheSeconds = AcceleratorFilter.this.cacheSeconds;
520 SimpleDateFormat parser = new SimpleDateFormat(Headers.RFC_1123_DATE_FORMAT, Locale.US);
521 expires = parser.parse(value).getTime();
522 calculateCacheSeconds();
524 catch (ParseException e) {
525 log.warn("ignoring date for header \"Expires\" in invalid format: {}", value);
530 if (name.equalsIgnoreCase(Headers.HEADER_LAST_MODIFIED)) {
533 lastModified = AcceleratorFilter.this.lastModified;
537 SimpleDateFormat parser = new SimpleDateFormat(Headers.RFC_1123_DATE_FORMAT, Locale.US);
538 lastModified = parser.parse(value).getTime();
540 catch (ParseException e) {
541 log.warn("ignoring date for header \"Last-Modified\" in invalid format: {}", value);
546 if (name.equalsIgnoreCase(Headers.HEADER_ETAG)) {
549 eTag = AcceleratorFilter.this.eTag;
550 weak = AcceleratorFilter.this.weak;
554 value = value.trim();
556 int end = value.length();
557 if (value.startsWith("W/")) {
564 if (value.charAt(start) == '"')
567 log.warn("Quote at the beginning ov ETag is missing: {}", value);
568 if (value.charAt(end -1) == '"')
571 log.warn("Quote at the end of ETag is missing: {}", value);
572 eTag = value.substring(start, end);
573 String filtered = eTag.replaceAll("[^\\x00-\\x21\\x23-\\x7F]+","");
574 if (filtered.length() < eTag.length()) {
575 log.warn("filtering out illegal characters in ETag: \"{}\" -> \"{}\"", eTag, filtered);
580 if (name.equalsIgnoreCase(Headers.HEADER_CACHE_CONTROL)) {
585 for (String param : value.split(",")) {
586 param = param.trim();
587 int pos = param.indexOf("=");
589 cacheParams.put(param, null);
592 String paramName = param.substring(0, pos).trim();
593 if (paramName.equalsIgnoreCase("max-age")) {
595 cacheSeconds = Integer.parseInt(param.substring(pos + 1));
596 cacheSecondsSet = true;
598 catch (NumberFormatException e) {
599 log.warn("illegal value for Header \"Cache-Control\":", param);
603 cacheParams.put(paramName, param.substring(pos + 1));
610 if (name.equalsIgnoreCase(Headers.HEADER_PRAGMA)) {
611 if (value != null && value.trim().equalsIgnoreCase("no-cache"))
616 /** Pass header through, if no value from intrest was found */
618 response.setHeader(name, value);
620 response.addHeader(name, value);
623 private void calculateCacheSeconds() {
624 if (!cacheSecondsSet && expires >= now) {
625 cacheSeconds = (int)(expires/1000 - now/1000);
626 log.debug("calculating cache-seconds from DATE and EXPIRES: {}", cacheSeconds);
631 private class AcceleratorServletOutputStream extends ServletOutputStream {
633 private final ServletOutputStream sos;
636 private AcceleratorServletOutputStream() throws IOException {
637 bufferSize = defaultBufferSize;
638 buffer = new byte[bufferSize];
639 sos = AccelerationWrapper.this.response.getOutputStream();
643 private OutputStream out() throws IOException {
645 os = zipped ? new GZIPOutputStream(sos) : sos;
650 public void write(int i) throws IOException {
651 if (pos == bufferSize) {
654 /** Dekoration nur beim ersten Schreib-Schub anstoßen */
656 cacheControl.decorate(request, response);
659 buffer[pos++] = (byte) i;
664 public void flush() throws IOException {
669 /** Dekoration nur beim ersten Schreib-Schub anstoßen */
671 cacheControl.decorate(request, response);
672 out().write(buffer, 0, pos);
678 public void close() throws IOException {
682 cacheControl.decorate(request, response);