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;
37 @Configurable(autowire=Autowire.BY_NAME)
38 public class AcceleratorFilter implements Filter {
39 private final static Logger log = LoggerFactory.getLogger(AcceleratorFilter.class);
41 private final static Map<String,String> EMPTY = Collections.unmodifiableMap(new HashMap<String,String>());
43 public final static Integer DEFAULT_BUFFER_SIZE = 1024;
44 public final static String REQUEST_URI_ATTRIBUTE = "javax.servlet.include.request_uri";
45 public final static String RESPONSE_WRAPPER = AcceleratorFilter.class.getName() + ".RESPONSE_WRAPPER";
48 @Autowired CacheControl cacheControl;
49 @Autowired(required=false) Integer defaultBufferSize = DEFAULT_BUFFER_SIZE;
50 @Autowired String eTag;
51 @Autowired Boolean weak;
52 @Autowired Long lastModified;
53 @Autowired Integer cacheSeconds;
57 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
58 if (!(request instanceof HttpServletRequest)) {
59 log.error("AcceleratorFilter can only handle HTTP-requests");
60 chain.doFilter(request, response);
64 // TODO: Das macht so wahrscheinlich keinen Sinn...
65 /** Prüfen, ob es sich um eine Anfrage für einen JSP-Include handelt */
66 if (request.getAttribute(REQUEST_URI_ATTRIBUTE) != null) {
67 log.debug("Includes cannot be accelerated");
68 chain.doFilter(request, response);
72 HttpServletRequest httpRequest = (HttpServletRequest)request;
73 HttpServletResponse httpResponse = (HttpServletResponse)response;
74 AccelerationWrapper wrapper = new AccelerationWrapper(httpRequest, httpResponse);
75 httpRequest.setAttribute(RESPONSE_WRAPPER, wrapper);
76 cacheControl.init(wrapper);
77 chain.doFilter(request, wrapper);
82 public void init(FilterConfig filterConfig) throws ServletException {
86 public void destroy() {
90 class AccelerationWrapper implements HttpServletResponse, CacheMethodHandle {
92 private final HttpServletRequest request;
93 private final HttpServletResponse response;
95 private final AcceleratorServletOutputStream out;
97 private ServletOutputStream stream;
98 private PrintWriter writer;
100 private boolean guessing = true;
101 protected boolean zipped = false; // << CacheControll greift direkt auf diese Variable zu!
105 private int cacheSeconds;
106 private boolean cacheSecondsSet = false;
107 private long lastModified, expires = 0l;
109 private boolean weak;
110 private Map<String,String> cacheParams;
112 /** Für den AcceleratorOutputStream */
113 private boolean committed = false;
114 private OutputStream os = null;
115 private int bufferSize;
116 private byte[] buffer;
118 private int size = 0;
122 AccelerationWrapper(HttpServletRequest request, HttpServletResponse response) throws IOException {
124 this.request = request;
125 this.response = response;
127 now = System.currentTimeMillis();
128 status = HttpServletResponse.SC_OK;
129 cacheSeconds = AcceleratorFilter.this.cacheSeconds;
130 lastModified = AcceleratorFilter.this.lastModified;
131 eTag = AcceleratorFilter.this.eTag;
132 weak = AcceleratorFilter.this.weak;
133 cacheParams = new HashMap<String,String>();
135 Enumeration values = request.getHeaders(Headers.HEADER_ACCEPT_ENCODING);
136 while (values.hasMoreElements()) {
137 String value = (String) values.nextElement();
138 if (value.indexOf("gzip") != -1) {
144 out = new AcceleratorServletOutputStream();
148 private void finish() throws IOException {
154 public void setStatus(int sc) {
155 response.setStatus(sc);
160 public void setStatus(int sc, String sm) {
161 response.setStatus(sc,sm);
166 public void addDateHeader(String name, long value) {
169 response.addDateHeader(name, value);
173 if (Headers.HEADER_DATE.equalsIgnoreCase(name)) {
175 calculateCacheSeconds();
179 if (Headers.HEADER_EXPIRES.equalsIgnoreCase(name)) {
181 calculateCacheSeconds();
185 if (Headers.HEADER_LAST_MODIFIED.equalsIgnoreCase(name)) {
186 lastModified = value;
190 /** Unknown header: pass throug! */
191 response.addDateHeader(name, value);
195 public void addHeader(String name, String value) {
198 response.addHeader(name, value);
204 analyzeHeader(name, value, false);
208 public void addIntHeader(String name, int value) {
211 response.addIntHeader(name, value);
215 analyzeHeader(name, Integer.toString(value), false);
219 public void setDateHeader(String name, long value) {
222 response.setDateHeader(name, value);
226 if (Headers.HEADER_DATE.equalsIgnoreCase(name)) {
228 calculateCacheSeconds();
232 if (Headers.HEADER_EXPIRES.equalsIgnoreCase(name)) {
234 calculateCacheSeconds();
238 if (Headers.HEADER_LAST_MODIFIED.equalsIgnoreCase(name)) {
239 lastModified = value;
243 /** Unknown header: pass throug! */
244 response.setDateHeader(name, value);
248 public void setHeader(String name, String value) {
251 response.setHeader(name, value);
255 analyzeHeader(name, value, true);
259 public void setIntHeader(String name, int value) {
262 response.setIntHeader(name, value);
266 analyzeHeader(name, Integer.toString(value), true);
270 public ServletOutputStream getOutputStream() throws IOException {
273 throw new IllegalStateException("ServletOutputStream and PrintWriter cannot be requested both!");
275 if (stream == null) {
283 public PrintWriter getWriter() throws IOException {
286 throw new IllegalStateException("ServletOutputStream and PrintWriter cannot be requested both!");
288 if (writer == null) {
289 writer = new PrintWriter(new OutputStreamWriter(out, response.getCharacterEncoding()));
296 public void setContentLength(int len) {
298 log.info("Supressing explicit content-length {} for request {}, because content will be zipped!", len, request.getRequestURI());
300 response.setContentLength(len);
304 public int getBufferSize() {
309 public void setBufferSize(int size) {
311 throw new IllegalStateException("cannot change buffer size, because content was already written!");
313 buffer = new byte[size];
317 public void resetBuffer() {
319 throw new IllegalStateException("cannot reset buffer, because response is already commited!");
326 public void reset() {
328 throw new IllegalStateException("cannot reset response, because response is already commited!");
330 * Da committed==false gilt, wurde die Dekoration noch nicht angestßen
331 * und muss entsprechend auch nicht rückgängig gemacht werden!
340 public void flushBuffer() throws IOException {
343 else if (stream != null)
350 public void addCookie(Cookie cookie) {
351 // TODO: Je nach Vary-Einstellung ETag anpassen?
352 response.addCookie(cookie);
356 public boolean containsHeader(String name) {
357 return response.containsHeader(name);
361 public String encodeURL(String url) {
362 return response.encodeURL(url);
366 public String encodeRedirectURL(String url) {
367 return response.encodeRedirectURL(url);
371 public String encodeUrl(String url) {
372 return response.encodeUrl(url);
376 public String encodeRedirectUrl(String url) {
377 return response.encodeRedirectUrl(url);
381 public void sendError(int sc, String msg) throws IOException {
382 response.sendError(sc,msg);
386 public void sendError(int sc) throws IOException {
387 response.sendError(sc);
391 public void sendRedirect(String location) throws IOException {
392 response.sendRedirect(location);
396 public String getCharacterEncoding() {
397 return response.getCharacterEncoding();
401 public String getContentType() {
402 return response.getContentType();
406 public void setCharacterEncoding(String charset) {
407 // TODO: Je nach Vary-Einstellung ETag anpassen?
408 response.setCharacterEncoding(charset);
412 public void setContentType(String type) {
413 // TODO: Je nach Vary-Einstellung ETag anpassen?
414 response.setContentType(type);
418 public boolean isCommitted() {
423 public void setLocale(Locale loc) {
424 // TODO: Je nach Vary-Einstellung ETag anpassen?
425 response.setLocale(loc);
429 public Locale getLocale() {
436 public boolean isZipped() {
441 public long getTimestamp() {
446 public int accepts(HttpServletRequest request) {
451 public int getCacheSeconds(HttpServletRequest request) {
456 public long getLastModified(HttpServletRequest request) {
461 public String getETag(HttpServletRequest request) {
466 public boolean isETagWeak() {
471 public void cacheControl(HttpServletRequest request, Map<String, String> cacheControlMap) {
472 cacheControlMap.putAll(cacheParams);
476 public Map<String,String> getAdditionalHeaders(HttpServletRequest request) {
480 public void supressGuessing() {
485 private void analyzeHeader(String name, String value, boolean overwrite) {
490 if (name.equalsIgnoreCase(Headers.HEADER_DATE)) {
493 now = System.currentTimeMillis();
494 cacheSeconds = AcceleratorFilter.this.cacheSeconds;
499 SimpleDateFormat parser = new SimpleDateFormat(Headers.RFC_1123_DATE_FORMAT, Locale.US);
500 now = parser.parse(value).getTime();
501 calculateCacheSeconds();
503 catch (ParseException e) {
504 log.warn("ignoring date for header \"Date\" in invalid format: {}", value);
509 if (name.equalsIgnoreCase(Headers.HEADER_EXPIRES)) {
513 cacheSeconds = AcceleratorFilter.this.cacheSeconds;
518 SimpleDateFormat parser = new SimpleDateFormat(Headers.RFC_1123_DATE_FORMAT, Locale.US);
519 expires = parser.parse(value).getTime();
520 calculateCacheSeconds();
522 catch (ParseException e) {
523 log.warn("ignoring date for header \"Expires\" in invalid format: {}", value);
528 if (name.equalsIgnoreCase(Headers.HEADER_LAST_MODIFIED)) {
531 lastModified = AcceleratorFilter.this.lastModified;
535 SimpleDateFormat parser = new SimpleDateFormat(Headers.RFC_1123_DATE_FORMAT, Locale.US);
536 lastModified = parser.parse(value).getTime();
538 catch (ParseException e) {
539 log.warn("ignoring date for header \"Last-Modified\" in invalid format: {}", value);
544 if (name.equalsIgnoreCase(Headers.HEADER_ETAG)) {
547 eTag = AcceleratorFilter.this.eTag;
548 weak = AcceleratorFilter.this.weak;
552 value = value.trim();
554 int end = value.length();
555 if (value.startsWith("W/")) {
562 if (value.charAt(start) == '"')
565 log.warn("Quote at the beginning ov ETag is missing: {}", value);
566 if (value.charAt(end -1) == '"')
569 log.warn("Quote at the end of ETag is missing: {}", value);
570 eTag = value.substring(start, end);
571 String filtered = eTag.replaceAll("[^\\x00-\\x21\\x23-\\x7F]+","");
572 if (filtered.length() < eTag.length()) {
573 log.warn("filtering out illegal characters in ETag: \"{}\" -> \"{}\"", eTag, filtered);
578 if (name.equalsIgnoreCase(Headers.HEADER_CACHE_CONTROL)) {
583 for (String param : value.split(",")) {
584 param = param.trim();
585 int pos = param.indexOf("=");
587 cacheParams.put(param, null);
590 String paramName = param.substring(0, pos).trim();
591 if (paramName.equalsIgnoreCase("max-age")) {
593 cacheSeconds = Integer.parseInt(param.substring(pos + 1));
594 cacheSecondsSet = true;
596 catch (NumberFormatException e) {
597 log.warn("illegal value for Header \"Cache-Control\":", param);
601 cacheParams.put(paramName, param.substring(pos + 1));
608 if (name.equalsIgnoreCase(Headers.HEADER_PRAGMA)) {
609 if (value != null && value.trim().equalsIgnoreCase("no-cache"))
614 /** Pass header through, if no value from intrest was found */
616 response.setHeader(name, value);
618 response.addHeader(name, value);
621 private void calculateCacheSeconds() {
622 if (!cacheSecondsSet && expires >= now) {
623 cacheSeconds = (int)(expires/1000 - now/1000);
624 log.debug("calculating cache-seconds from DATE and EXPIRES: {}", cacheSeconds);
629 private class AcceleratorServletOutputStream extends ServletOutputStream {
631 private final ServletOutputStream sos;
634 private AcceleratorServletOutputStream() throws IOException {
635 bufferSize = defaultBufferSize;
636 buffer = new byte[bufferSize];
637 sos = AccelerationWrapper.this.response.getOutputStream();
641 private OutputStream out() throws IOException {
643 os = zipped ? new GZIPOutputStream(sos) : sos;
648 public void write(int i) throws IOException {
649 if (pos == bufferSize) {
653 cacheControl.decorate(request, response, this);
655 buffer[pos++] = (byte) i;
660 public void flush() throws IOException {
665 cacheControl.decorate(request, response, this);
666 out().write(buffer, 0, pos);
672 public void close() throws IOException {
676 cacheControl.decorate(request, response, this);