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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.core;
import com.ning.http.client.RequestBuilder;
import com.yahoo.jdisc.HeaderFields;
import com.yahoo.jdisc.http.HttpHeaders;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen Hult</a>
*/
public class HeaderFieldsUtil {
private static final byte[] DELIM_BYTES = ": ".getBytes(StandardCharsets.UTF_8);
private static final byte[] CRLF_BYTES = "\r\n".getBytes(StandardCharsets.UTF_8);
private static final Set<String> IGNORED_HEADERS = new HashSet<>(Arrays.asList(
HttpHeaders.Names.CONTENT_LENGTH,
HttpHeaders.Names.TRANSFER_ENCODING));
public static void copyHeaders(com.yahoo.jdisc.Request src, RequestBuilder dst) {
copyHeaderFields(src.headers(), dst::addHeader);
}
public static void copyTrailers(com.yahoo.jdisc.Request src, RequestBuilder dst) {
copyTrailers(src, dst::addHeader);
}
public static void copyTrailers(com.yahoo.jdisc.Request src, ByteArrayOutputStream dst) {
copyTrailers(src, newSimpleHeaders(dst));
}
@SuppressWarnings("SynchronizationOnLocalVariableOrMethodParameter")
public static void copyTrailers(com.yahoo.jdisc.Request src, SimpleHeaders dst) {
if (!(src instanceof com.yahoo.jdisc.http.HttpRequest)) {
return;
}
final HeaderFields trailers = ((com.yahoo.jdisc.http.HttpRequest)src).trailers();
synchronized (trailers) {
copyHeaderFields(trailers, dst);
}
}
private static void copyHeaderFields(HeaderFields src, SimpleHeaders dst) {
for (Map.Entry<String, List<String>> entry : src.entrySet()) {
String key = entry.getKey();
if (key != null && !IGNORED_HEADERS.contains(key)) {
if (entry.getValue() == null) {
dst.addHeader(key, "");
continue;
}
for (String value : entry.getValue()) {
dst.addHeader(key, value != null ? value : "");
}
}
}
}
private static SimpleHeaders newSimpleHeaders(final ByteArrayOutputStream dst) {
return new SimpleHeaders() {
@Override
public void addHeader(String name, String value) {
safeWrite(name.getBytes(StandardCharsets.UTF_8));
safeWrite(DELIM_BYTES);
safeWrite(value.getBytes(StandardCharsets.UTF_8));
safeWrite(CRLF_BYTES);
}
void safeWrite(byte[] buf) {
dst.write(buf, 0, buf.length);
}
};
}
private interface SimpleHeaders {
void addHeader(String name, String value);
}
}
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