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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http;
import com.yahoo.jdisc.HeaderFields;
import com.yahoo.jdisc.Request;
import com.yahoo.jdisc.Response;
import com.yahoo.jdisc.handler.CompletionHandler;
import com.yahoo.jdisc.handler.ContentChannel;
import com.yahoo.jdisc.handler.ResponseHandler;
import com.yahoo.jdisc.http.servlet.ServletOrJdiscHttpResponse;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
/**
* A HTTP response.
*
* @author Einar M R Rosenvinge
*/
public class HttpResponse extends Response implements ServletOrJdiscHttpResponse {
private final HeaderFields trailers = new HeaderFields();
private boolean chunkedEncodingEnabled = true;
private String message;
public interface Status extends Response.Status {
int REQUEST_ENTITY_TOO_LARGE = REQUEST_TOO_LONG;
int REQUEST_RANGE_NOT_SATISFIABLE = REQUESTED_RANGE_NOT_SATISFIABLE;
}
protected HttpResponse(Request request, int status, String message, Throwable error) {
super(status, error);
this.message = message;
}
public boolean isChunkedEncodingEnabled() {
if (headers().contains(HttpHeaders.Names.TRANSFER_ENCODING, HttpHeaders.Values.CHUNKED)) {
return true;
}
if (headers().containsKey(HttpHeaders.Names.CONTENT_LENGTH)) {
return false;
}
return chunkedEncodingEnabled;
}
public void setChunkedEncodingEnabled(boolean chunkedEncodingEnabled) {
this.chunkedEncodingEnabled = chunkedEncodingEnabled;
}
public void setMessage(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
@Override
public void copyHeaders(HeaderFields target) {
target.addAll(headers());
}
public List<Cookie> decodeSetCookieHeader() {
List<String> cookies = headers().get(HttpHeaders.Names.SET_COOKIE);
if (cookies == null) {
return Collections.emptyList();
}
List<Cookie> ret = new LinkedList<>();
for (String cookie : cookies) {
ret.add(Cookie.fromSetCookieHeader(cookie));
}
return ret;
}
public void encodeSetCookieHeader(List<Cookie> cookies) {
headers().remove(HttpHeaders.Names.SET_COOKIE);
for (Cookie cookie : cookies) {
headers().add(HttpHeaders.Names.SET_COOKIE, Cookie.toSetCookieHeaders(Arrays.asList(cookie)));
}
}
/**
* <p>Returns the set of trailer header fields of this HttpResponse. These are typically meta-data that should have
* been part of {@link #headers()}, but were not available prior to calling {@link
* ResponseHandler#handleResponse(Response)}. You must NOT WRITE to these headers AFTER calling {@link
* ContentChannel#close(CompletionHandler)}, and you must NOT READ from these headers BEFORE {@link
* ContentChannel#close(CompletionHandler)} has been called.</p>
*
* <p><b>NOTE:</b> These headers are NOT thread-safe. You need to explicitly synchronized on the returned object to
* prevent concurrency issues such as ConcurrentModificationExceptions.</p>
*
* @return The trailer headers of this HttpRequest.
*/
public HeaderFields trailers() {
return trailers;
}
public static boolean isServerError(Response response) {
return (response.getStatus() >= 500) && (response.getStatus() < 600);
}
public static HttpResponse newInstance(int status) {
return new HttpResponse(null, status, null, null);
}
public static HttpResponse newInstance(int status, String message) {
return new HttpResponse(null, status, message, null);
}
public static HttpResponse newError(Request request, int status, Throwable error) {
return new HttpResponse(request, status, formatMessage(error), error);
}
public static HttpResponse newInternalServerError(Request request, Throwable error) {
return new HttpResponse(request, Status.INTERNAL_SERVER_ERROR, formatMessage(error), error);
}
private static String formatMessage(Throwable t) {
String msg = t.getMessage();
return msg != null ? msg : t.toString();
}
}
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