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SPR-6759 - Jetty 7 doesn't like ShallowEtagHeaderFilter

This commit is contained in:
Arjen Poutsma 2010-01-27 13:02:02 +00:00
parent 1bbe93e535
commit 0a4a09a09d
2 changed files with 84 additions and 10 deletions
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85
org.springframework.web/src/main/java/org/springframework/web/filter/ShallowEtagHeaderFilter.java
View File

@ -57,26 +57,61 @@ public class ShallowEtagHeaderFilter extends OncePerRequestFilter {
filterChain.doFilter(request, responseWrapper);
byte[] body = responseWrapper.toByteArray();
String responseETag = generateETagHeaderValue(body);
response.setHeader(HEADER_ETAG, responseETag);
int statusCode = responseWrapper.getStatusCode();
String requestETag = request.getHeader(HEADER_IF_NONE_MATCH);
if (responseETag.equals(requestETag)) {
if (logger.isTraceEnabled()) {
logger.trace("ETag [" + responseETag + "] equal to If-None-Match, sending 304");
if (isEligibleForEtag(request, responseWrapper, statusCode, body)) {
String responseETag = generateETagHeaderValue(body);
response.setHeader(HEADER_ETAG, responseETag);
String requestETag = request.getHeader(HEADER_IF_NONE_MATCH);
if (responseETag.equals(requestETag)) {
if (logger.isTraceEnabled()) {
logger.trace("ETag [" + responseETag + "] equal to If-None-Match, sending 304");
}
response.setContentLength(0);
response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
}
else {
if (logger.isTraceEnabled()) {
logger.trace("ETag [" + responseETag + "] not equal to If-None-Match [" + requestETag +
"], sending normal response");
}
copyBodyToResponse(body, response);
}
response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
}
else {
if (logger.isTraceEnabled()) {
logger.trace("ETag [" + responseETag + "] not equal to If-None-Match [" + requestETag +
"], sending normal response");
logger.trace("Response with status code [" + statusCode + "] not eligible for ETag");
}
response.setContentLength(body.length);
copyBodyToResponse(body, response);
}
}
private void copyBodyToResponse(byte[] body, HttpServletResponse response) throws IOException {
response.setContentLength(body.length);
if (body.length > 0) {
FileCopyUtils.copy(body, response.getOutputStream());
}
}
/**
* Indicates whether the given request and response are eligible for ETag generation.
*
* <p>Default implementation returns {@code true} for response status codes in the {@code 2xx} series.
*
* @param request the HTTP request
* @param response the HTTP response
* @param responseStatusCode the HTTP response status code
* @param responseBody the response body
* @return {@code true} if eligible for ETag generation; {@code false} otherwise
*/
protected boolean isEligibleForEtag(HttpServletRequest request,
HttpServletResponse response,
int responseStatusCode,
byte[] responseBody) {
return (responseStatusCode >= 200 && responseStatusCode < 300);
}
/**
* Generate the ETag header value from the given response body byte array. <p>The default implementation generates an
* MD5 hash.
@ -105,10 +140,36 @@ public class ShallowEtagHeaderFilter extends OncePerRequestFilter {
private PrintWriter writer;
private int statusCode = -1;
private ShallowEtagResponseWrapper(HttpServletResponse response) {
super(response);
}
@Override
public void setStatus(int sc) {
super.setStatus(sc);
this.statusCode = sc;
}
@Override
public void setStatus(int sc, String sm) {
super.setStatus(sc, sm);
this.statusCode = sc;
}
@Override
public void sendError(int sc) throws IOException {
super.sendError(sc);
this.statusCode = sc;
}
@Override
public void sendError(int sc, String msg) throws IOException {
super.sendError(sc, msg);
this.statusCode = sc;
}
@Override
public ServletOutputStream getOutputStream() {
return this.outputStream;
@ -135,6 +196,10 @@ public class ShallowEtagHeaderFilter extends OncePerRequestFilter {
resetBuffer();
}
private int getStatusCode() {
return statusCode;
}
private byte[] toByteArray() {
return this.content.toByteArray();
}

9
org.springframework.web/src/test/java/org/springframework/web/filter/ShallowEtagHeaderFilterTest.java
View File

@ -40,6 +40,15 @@ public class ShallowEtagHeaderFilterTest {
filter = new ShallowEtagHeaderFilter();
}
@Test
public void isEligibleForEtag() {
MockHttpServletRequest request = new MockHttpServletRequest("GET", "/hotels");
MockHttpServletResponse response = new MockHttpServletResponse();
assertTrue(filter.isEligibleForEtag(request, response, 200, new byte[0]));
assertFalse(filter.isEligibleForEtag(request, response, 300, new byte[0]));
}
@Test
public void filterNoMatch() throws Exception {
final MockHttpServletRequest request = new MockHttpServletRequest("GET", "/hotels");