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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package io.milton.http.http11;
import io.milton.http.*;
import io.milton.http.Response.Status;
import io.milton.http.entity.BufferingGetableResourceEntity;
import io.milton.http.entity.GetableResourceEntity;
import io.milton.http.entity.PartialEntity;
import io.milton.http.exceptions.BadRequestException;
import io.milton.http.exceptions.NotAuthorizedException;
import io.milton.http.exceptions.NotFoundException;
import io.milton.resource.BufferingControlResource;
import io.milton.resource.GetableResource;
import io.milton.resource.Resource;
import io.milton.servlet.ServletRequest;
import io.milton.servlet.ServletResponse;
import jakarta.servlet.ServletException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.*;
/**
*
*/
public class DefaultHttp11ResponseHandler implements Http11ResponseHandler, Bufferable {
private static final Logger log = LoggerFactory.getLogger(DefaultHttp11ResponseHandler.class);
private static final String miltonVerson;
static {
Properties props = new Properties();
try {
props.load(DefaultHttp11ResponseHandler.class.getResourceAsStream("/milton.properties"));
} catch (IOException ex) {
log.warn("Failed lot load milton properties file", ex);
}
miltonVerson = props.getProperty("milton.version");
}
public enum BUFFERING {
always,
never,
whenNeeded
}
private final AuthenticationService authenticationService;
private final ETagGenerator eTagGenerator;
private final ContentGenerator contentGenerator;
private CacheControlHelper cacheControlHelper = new DefaultCacheControlHelper();
private int maxMemorySize = 100000;
private BUFFERING buffering;
private String multipartBoundary = UUID.randomUUID().toString();
public DefaultHttp11ResponseHandler(AuthenticationService authenticationService, ETagGenerator eTagGenerator, ContentGenerator contentGenerator) {
this.authenticationService = authenticationService;
this.eTagGenerator = eTagGenerator;
this.contentGenerator = contentGenerator;
}
/**
* Defaults to io.milton.http.http11.DefaultCacheControlHelper
*
* @return
*/
public CacheControlHelper getCacheControlHelper() {
return cacheControlHelper;
}
public void setCacheControlHelper(CacheControlHelper cacheControlHelper) {
this.cacheControlHelper = cacheControlHelper;
}
@Override
public String generateEtag(Resource r) {
return eTagGenerator.generateEtag(r);
}
@Override
public void respondWithOptions(Resource resource, Response response, Request request, List methodsAllowed) {
setRespondCommonHeaders(response, resource, Status.SC_OK, request.getAuthorization());
response.setAllowHeader(methodsAllowed);
response.setContentLengthHeader((long) 0); // Note that setting content length must be done last for tomcat5
}
@Override
public void respondNotFound(Response response, Request request) {
response.setStatus(Response.Status.SC_NOT_FOUND);
response.setContentTypeHeader("text/html");
contentGenerator.generate(null, request, response, Status.SC_NOT_FOUND);
}
@Override
public void respondUnauthorised(Resource resource, Response response, Request request) {
if (authenticationService.canUseExternalAuth(resource, request)) {
log.info("respondUnauthorised: use external authentication");
initiateExternalAuth(resource, request, response);
} else {
Auth auth = request.getAuthorization();
if (auth == null || auth.getTag() == null) {
log.info("respondUnauthorised: no authenticated user, so return status: " + Response.Status.SC_UNAUTHORIZED);
response.setStatus(Response.Status.SC_UNAUTHORIZED);
List challenges = authenticationService.getChallenges(resource, request);
response.setAuthenticateHeader(challenges);
} else {
log.info("respondUnauthorised: request has an authenticated user, so return status: " + Response.Status.SC_FORBIDDEN);
response.setStatus(Response.Status.SC_FORBIDDEN);
}
}
}
@Override
public void respondMethodNotImplemented(Resource resource, Response response, Request request) {
response.setStatus(Response.Status.SC_NOT_IMPLEMENTED);
contentGenerator.generate(resource, request, response, Status.SC_NOT_IMPLEMENTED);
}
@Override
public void respondMethodNotAllowed(Resource res, Response response, Request request) {
log.debug("method not allowed. handler: " + this.getClass().getName() + " resource: " + res.getClass().getName());
response.setStatus(Response.Status.SC_METHOD_NOT_ALLOWED);
contentGenerator.generate(res, request, response, Status.SC_METHOD_NOT_ALLOWED);
}
/**
* @param resource
* @param response
* @param request
* @param message - optional message to output in the body content
*/
@Override
public void respondConflict(Resource resource, Response response, Request request, String message) {
log.debug("respondConflict");
response.setStatus(Response.Status.SC_CONFLICT);
contentGenerator.generate(resource, request, response, Status.SC_CONFLICT);
}
@Override
public void respondServerError(Request request, Response response, String reason) {
response.setStatus(Status.SC_INTERNAL_SERVER_ERROR);
contentGenerator.generate(null, request, response, Status.SC_INTERNAL_SERVER_ERROR);
}
@Override
public void respondRedirect(Response response, Request request, String redirectUrl) {
if (redirectUrl == null) {
throw new NullPointerException("redirectUrl cannot be null");
}
log.trace("respondRedirect");
// delegate to the response, because this can be server dependent
try {
ServletRequest.getRequest().getRequestDispatcher(redirectUrl.substring(redirectUrl.lastIndexOf("/"))).forward(ServletRequest.getRequest(), ServletResponse.getResponse());
} catch (ServletException e) {
} catch (IOException e) {
e.printStackTrace();
}
// response.sendRedirect(redirectUrl);
// response.setStatus(Response.Status.SC_MOVED_TEMPORARILY);
// response.setLocationHeader(redirectUrl);
}
@Override
public void respondExpectationFailed(Response response, Request request) {
response.setStatus(Response.Status.SC_EXPECTATION_FAILED);
}
@Override
public void respondCreated(Resource resource, Response response, Request request) {
// log.debug( "respondCreated" );
setRespondCommonHeaders(response, resource, Status.SC_CREATED, request.getAuthorization());
}
@Override
public void respondNoContent(Resource resource, Response response, Request request) {
// log.debug( "respondNoContent" );
//response.setStatus(Response.Status.SC_OK);
// see comments in http://www.ettrema.com:8080/browse/MIL-87
setRespondCommonHeaders(response, resource, Status.SC_NO_CONTENT, request.getAuthorization());
}
@Override
public void respondPartialContent(GetableResource resource, Response response, Request request, Map params, Range range) throws NotAuthorizedException, BadRequestException, NotFoundException {
log.debug("respondPartialContent: " + range.getStart() + " - " + range.getFinish());
response.setStatus(Response.Status.SC_PARTIAL_CONTENT);
long st = range.getStart() == null ? 0 : range.getStart();
long fn;
Long cl = resource.getContentLength();
if (range.getFinish() == null) {
if (cl != null) {
fn = cl - 1; // position is one less then length
} else {
log.warn("Couldnt calculate range end position because the resource is not reporting a content length, and no end position was requested by the client: " + resource.getName() + " - " + resource.getClass());
fn = -1;
}
} else {
if (cl != null && cl < range.getFinish()) {
fn = cl - 1;
} else if (cl == null) {
log.warn("Couldnt calculate range end position because the resource is not reporting a content length, and no end position was requested by the client: " + resource.getName() + " - " + resource.getClass());
fn = -1;
} else {
fn = range.getFinish();
}
}
response.setContentRangeHeader(st, fn, cl);
long contentLength = fn - st + 1;
response.setDateHeader(new Date());
String etag = eTagGenerator.generateEtag(resource);
if (etag != null) {
response.setEtag(etag);
}
//String acc = request.getAcceptHeader();
// String ct = resource.getContentType(acc);
// if (ct != null) {
// response.setContentTypeHeader(ct);
// }
response.setContentLengthHeader(contentLength);
response.setEntity(new GetableResourceEntity(resource, range, params, null));
}
/**
* Send a partial content response with multiple ranges
*
* @param resource
* @param response
* @param request
* @param params
* @param ranges
* @throws NotAuthorizedException
* @throws BadRequestException
* @throws NotFoundException
*/
@Override
public void respondPartialContent(GetableResource resource, Response response, Request request, Map params, List ranges) throws NotAuthorizedException, BadRequestException, NotFoundException {
log.debug("respondPartialContent - multiple ranges");
response.setStatus(Response.Status.SC_PARTIAL_CONTENT);
response.setAcceptRanges("bytes");
response.setDateHeader(new Date());
String etag = eTagGenerator.generateEtag(resource);
if (etag != null) {
response.setEtag(etag);
}
response.setContentTypeHeader("multipart/byteranges; boundary=" + multipartBoundary);
String acc = request.getAcceptHeader();
String ct = resource.getContentType(acc);
response.setEntity(
new PartialEntity(resource, ranges, params, ct, multipartBoundary)
);
}
@Override
public void respondHead(Resource resource, Response response, Request request) {
//setRespondContentCommonHeaders(response, resource, Response.Status.SC_NO_CONTENT, request.getAuthorization());
setRespondContentCommonHeaders(response, resource, Response.Status.SC_OK, request.getAuthorization());
if (!(resource instanceof GetableResource)) {
return;
}
GetableResource gr = (GetableResource) resource;
String acc = request.getAcceptHeader();
String ct = gr.getContentType(acc);
if (ct != null) {
ct = pickBestContentType(ct);
if (ct != null) {
response.setContentTypeHeader(ct);
}
}
Long contentLength = gr.getContentLength();
if (contentLength != null) {
response.setContentLengthHeader(contentLength);
} else {
log.trace("No content length is available for HEAD request");
}
}
@Override
public void respondContent(Resource resource, Response response, Request request, Map params) throws NotAuthorizedException, BadRequestException, NotFoundException {
log.debug("respondContent: " + resource.getClass());
Auth auth = request.getAuthorization();
setRespondContentCommonHeaders(response, resource, auth);
if (resource instanceof GetableResource) {
GetableResource gr = (GetableResource) resource;
String acc = request.getAcceptHeader();
String ct = gr.getContentType(acc);
if (ct != null) {
ct = pickBestContentType(ct);
response.setContentTypeHeader(ct);
}
cacheControlHelper.setCacheControl(gr, response, request.getAuthorization());
Long contentLength = gr.getContentLength();
Boolean doBuffering = null;
if (resource instanceof BufferingControlResource) {
BufferingControlResource bcr = (BufferingControlResource) resource;
doBuffering = bcr.isBufferingRequired();
}
if (doBuffering == null) {
if (buffering == null || buffering == BUFFERING.whenNeeded) {
doBuffering = (contentLength == null); // if no content length then we buffer content to find content length
} else {
doBuffering = (buffering == BUFFERING.always); // if not null or whenNeeded then buffering is explicitly enabled or disabled
}
}
if (!doBuffering) {
log.trace("sending content with known content length: " + contentLength);
if (contentLength != null) {
response.setContentLengthHeader(contentLength);
}
response.setEntity(new GetableResourceEntity(gr, params, ct));
} else {
BufferingGetableResourceEntity e = new BufferingGetableResourceEntity(gr, params, ct, contentLength, getMaxMemorySize());
response.setEntity(e);
}
}
}
@Override
public void respondNotModified(GetableResource resource, Response response, Request request) {
log.trace("respondNotModified");
response.setStatus(Response.Status.SC_NOT_MODIFIED);
response.setDateHeader(new Date());
String etag = eTagGenerator.generateEtag(resource);
if (etag != null) {
response.setEtag(etag);
}
// Note that we use a simpler modified date handling here then when
// responding with content, because in a not-modified situation the
// modified date MUST be that of the actual resource
Date modDate = resource.getModifiedDate();
response.setLastModifiedHeader(modDate);
cacheControlHelper.setCacheControl(resource, response, request.getAuthorization());
}
protected void setRespondContentCommonHeaders(Response response, Resource resource, Auth auth) {
setRespondContentCommonHeaders(response, resource, Response.Status.SC_OK, auth);
}
protected void setRespondContentCommonHeaders(Response response, Resource resource, Response.Status status, Auth auth) {
setRespondCommonHeaders(response, resource, status, auth);
setModifiedDate(response, resource, auth);
}
protected void setRespondCommonHeaders(Response response, Resource resource, Response.Status status, Auth auth) {
response.setStatus(status);
response.setNonStandardHeader("Server", "milton.io-" + miltonVerson);
response.setDateHeader(new Date());
response.setNonStandardHeader("Accept-Ranges", "bytes");
String etag = eTagGenerator.generateEtag(resource);
if (etag != null) {
response.setEtag(etag);
}
}
/**
* The modified date response header is used by the client for content
* caching. It seems obvious that if we have a modified date on the resource
* we should set it. BUT, because of the interaction with max-age we should
* always set it to the current date if we have max-age The problem, is that
* if we find that a condition GET has an expired mod-date (based on maxAge)
* then we want to respond with content (even if our mod-date hasnt changed.
* But if we use the actual mod-date in that case, then the browser will
* continue to use the old mod-date, so will forever more respond with
* content. So we send a mod-date of now to ensure that future requests will
* be given a 304 not modified.*
*
* @param response
* @param resource
* @param auth
*/
public static void setModifiedDate(Response response, Resource resource, Auth auth) {
Date modDate = resource.getModifiedDate();
if (modDate != null) {
// HACH - see if this helps IE
response.setLastModifiedHeader(modDate);
// if (resource instanceof GetableResource) {
// GetableResource gr = (GetableResource) resource;
// Long maxAge = gr.getMaxAgeSeconds(auth);
// if (maxAge != null && maxAge > 0) {
// log.trace("setModifiedDate: has a modified date and a positive maxAge, so adjust modDate");
// long tm = System.currentTimeMillis() - 60000; // modified 1 minute ago
// modDate = new Date(tm); // have max-age, so use current date
// }
// }
// response.setLastModifiedHeader(modDate);
}
}
@Override
public void respondBadRequest(Resource resource, Response response, Request request) {
response.setStatus(Response.Status.SC_BAD_REQUEST);
}
@Override
public void respondForbidden(Resource resource, Response response, Request request) {
response.setStatus(Response.Status.SC_FORBIDDEN);
}
@Override
public void respondDeleteFailed(Request request, Response response, Resource resource, Status status) {
response.setStatus(status);
}
@Override
public void respondPreconditionFailed(Request request, Response response, Resource resource) {
response.setStatus(Status.SC_PRECONDITION_FAILED);
}
public AuthenticationService getAuthenticationService() {
return authenticationService;
}
/**
* Maximum size of data to hold in memory per request when buffering output
* data.
*
* @return
*/
public int getMaxMemorySize() {
return maxMemorySize;
}
public void setMaxMemorySize(int maxMemorySize) {
this.maxMemorySize = maxMemorySize;
}
@Override
public BUFFERING getBuffering() {
return buffering;
}
@Override
public void setBuffering(BUFFERING buffering) {
this.buffering = buffering;
}
/**
* Sometimes we'll get a content type list, such as image/jpeg,image/pjpeg
*
* In this case we should pick the first in the list
*
* @param ct
* @return
*/
private String pickBestContentType(String ct) {
if (ct == null) {
return null;
} else if (ct.contains(",")) {
return ct.split(",")[0];
} else {
return ct;
}
}
public void initiateExternalAuth(Resource resource, Request request, Response response) {
ExternalIdentityProvider eip = getSelectedIP(request);
if (eip == null) {
// means that the user needs to select an identity provider, so generate appropriate page
} else {
eip.initiateExternalAuth(resource, request, response);
}
}
private ExternalIdentityProvider getSelectedIP(Request request) {
List list = authenticationService.getExternalIdentityProviders();
if (list.size() == 1) {
return list.get(0);
} else {
String ipName = request.getParams().get("_ip");
if (ipName != null && ipName.length() > 0) {
for (ExternalIdentityProvider eip : list) {
if (ipName.equals(eip.getName())) {
return eip;
}
}
}
return null;
}
}
public ContentGenerator getContentGenerator() {
return contentGenerator;
}
public String getMultipartBoundary() {
return multipartBoundary;
}
public void setMultipartBoundary(String multipartBoundary) {
this.multipartBoundary = multipartBoundary;
}
}