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/*
* Copyright © 2012 The Feign Authors ([email protected])
*
* Licensed 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 feign.http2client;
import static feign.Util.*;
import feign.AsyncClient;
import feign.Client;
import feign.Request;
import feign.Request.Options;
import feign.Request.ProtocolVersion;
import feign.Response;
import feign.Util;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpClient.Redirect;
import java.net.http.HttpClient.Version;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.BodyPublisher;
import java.net.http.HttpRequest.BodyPublishers;
import java.net.http.HttpRequest.Builder;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.time.Duration;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.OptionalLong;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.zip.GZIPInputStream;
import java.util.zip.InflaterInputStream;
public class Http2Client implements Client, AsyncClient<Object> {
private final HttpClient client;
private final Map<Integer, SoftReference<HttpClient>> clients = new ConcurrentHashMap<>();
/**
* Creates the new Http2Client using following defaults:
*
* <ul>
* <li>Connect Timeout: 10 seconds, as {@link Request.Options#Options()} uses
* <li>Follow all 3xx redirects
* <li>HTTP 2
* </ul>
*
* @see Request.Options#Options()
*/
public Http2Client() {
this(
HttpClient.newBuilder()
.followRedirects(Redirect.ALWAYS)
.version(Version.HTTP_2)
.connectTimeout(Duration.ofMillis(10000))
.build());
}
public Http2Client(Options options) {
this(newClientBuilder(options).version(Version.HTTP_2).build());
}
public Http2Client(HttpClient client) {
this.client = Util.checkNotNull(client, "HttpClient must not be null");
}
@Override
public Response execute(Request request, Options options) throws IOException {
final HttpRequest httpRequest;
try {
httpRequest = newRequestBuilder(request, options).version(client.version()).build();
} catch (URISyntaxException e) {
throw new IOException("Invalid uri " + request.url(), e);
}
HttpClient clientForRequest = getOrCreateClient(options);
HttpResponse<InputStream> httpResponse;
try {
httpResponse = clientForRequest.send(httpRequest, BodyHandlers.ofInputStream());
} catch (final InterruptedException e) {
Thread.currentThread().interrupt();
throw new IOException(e);
}
return toFeignResponse(request, httpResponse);
}
@Override
public CompletableFuture<Response> execute(
Request request, Options options, Optional<Object> requestContext) {
HttpRequest httpRequest;
try {
httpRequest = newRequestBuilder(request, options).build();
} catch (URISyntaxException e) {
throw new IllegalArgumentException("Invalid uri " + request.url(), e);
}
HttpClient clientForRequest = getOrCreateClient(options);
CompletableFuture<HttpResponse<InputStream>> future =
clientForRequest.sendAsync(httpRequest, HttpResponse.BodyHandlers.ofInputStream());
return future.thenApply(httpResponse -> toFeignResponse(request, httpResponse));
}
protected Response toFeignResponse(Request request, HttpResponse<InputStream> httpResponse) {
final OptionalLong length = httpResponse.headers().firstValueAsLong("Content-Length");
Integer contentLength =
length.isPresent() && length.getAsLong() >= 0 && length.getAsLong() <= Integer.MAX_VALUE
? (int) length.getAsLong()
: null;
InputStream body = httpResponse.body();
if (httpResponse.headers().allValues(CONTENT_ENCODING).contains(ENCODING_GZIP)) {
try {
body = new GZIPInputStream(body);
// the body is now decompressed, the Content-Length described the compressed bytes
contentLength = null;
} catch (IOException ignored) {
}
} else if (httpResponse.headers().allValues(CONTENT_ENCODING).contains(ENCODING_DEFLATE)) {
body = new InflaterInputStream(body);
contentLength = null;
}
return Response.builder()
.protocolVersion(enumForName(ProtocolVersion.class, httpResponse.version()))
.body(body, contentLength)
.reason(httpResponse.headers().firstValue("Reason-Phrase").orElse(null))
.request(request)
.status(httpResponse.statusCode())
.headers(castMapCollectType(httpResponse.headers().map()))
.build();
}
private HttpClient getOrCreateClient(Options options) {
if (doesClientConfigurationDiffer(options)) {
// create a new client from the existing one - but with connectTimeout and followRedirect
// settings from options
final int clientKey = createClientKey(options);
SoftReference<HttpClient> requestScopedSoftReference = clients.get(clientKey);
HttpClient requestScoped =
requestScopedSoftReference == null ? null : requestScopedSoftReference.get();
if (requestScoped == null) {
java.net.http.HttpClient.Builder builder =
newClientBuilder(options)
.sslContext(client.sslContext())
.sslParameters(client.sslParameters())
.version(client.version());
client.authenticator().ifPresent(builder::authenticator);
client.cookieHandler().ifPresent(builder::cookieHandler);
client.executor().ifPresent(builder::executor);
client.proxy().ifPresent(builder::proxy);
requestScoped = builder.build();
clients.put(clientKey, new SoftReference<>(requestScoped));
}
return requestScoped;
}
return client;
}
private boolean doesClientConfigurationDiffer(Options options) {
if ((client.followRedirects() == Redirect.ALWAYS) != options.isFollowRedirects()) {
return true;
}
return client
.connectTimeout()
.map(timeout -> timeout.toMillis() != options.connectTimeoutMillis())
.orElse(true);
}
/**
* Creates integer key that represents {@link Options} settings based on {@link
* Http2Client#doesClientConfigurationDiffer(Options)} method
*
* @param options value
* @return integer key
*/
public int createClientKey(feign.Request.Options options) {
int key = options.connectTimeoutMillis();
if (options.isFollowRedirects()) {
key |= 1 << 31; // connectTimeoutMillis always positive, so we can use first sign bit for
// isFollowRedirects flag
}
return key;
}
private static java.net.http.HttpClient.Builder newClientBuilder(Options options) {
return HttpClient.newBuilder()
.followRedirects(options.isFollowRedirects() ? Redirect.ALWAYS : Redirect.NEVER)
.connectTimeout(Duration.ofMillis(options.connectTimeoutMillis()));
}
private Builder newRequestBuilder(Request request, Options options) throws URISyntaxException {
URI uri = new URI(request.url());
final BodyPublisher body;
final byte[] data = request.body();
if (data == null) {
body = BodyPublishers.noBody();
} else {
body = BodyPublishers.ofByteArray(data);
}
final Builder requestBuilder =
HttpRequest.newBuilder()
.uri(uri)
.timeout(Duration.ofMillis(options.readTimeoutMillis()))
.version(client.version());
final Map<String, Collection<String>> headers = filterRestrictedHeaders(request.headers());
if (!headers.isEmpty()) {
requestBuilder.headers(asString(headers));
}
return requestBuilder.method(request.httpMethod().toString(), body);
}
/**
* There is a bunch o headers that the http2 client do not allow to be set.
*
* @see jdk.internal.net.http.common.Utils.DISALLOWED_HEADERS_SET
*/
private static final Set<String> DISALLOWED_HEADERS_SET =
disallowedHeaders(System.getProperty("jdk.httpclient.allowRestrictedHeaders"));
/**
* Builds the set of headers the underlying JDK HttpClient refuses to send. Mirrors {@code
* jdk.internal.net.http.common.Utils#getDisallowedHeaders()}: headers listed (comma separated) in
* the {@code jdk.httpclient.allowRestrictedHeaders} system property are removed from the set, so
* that callers who opt in at the JDK level (e.g. to set {@code Host}) are not silently filtered
* out here as well.
*/
static Set<String> disallowedHeaders(String allowRestrictedHeaders) {
// A case insensitive TreeSet of strings.
final TreeSet<String> treeSet = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
treeSet.addAll(Set.of("connection", "content-length", "expect", "host", "upgrade"));
if (allowRestrictedHeaders != null) {
for (String header : allowRestrictedHeaders.split(",")) {
treeSet.remove(header.trim());
}
}
return Collections.unmodifiableSet(treeSet);
}
private Map<String, Collection<String>> filterRestrictedHeaders(
Map<String, Collection<String>> headers) {
final Map<String, Collection<String>> filteredHeaders =
headers.keySet().stream()
.filter(headerName -> !DISALLOWED_HEADERS_SET.contains(headerName))
.collect(Collectors.toMap(Function.identity(), headers::get));
filteredHeaders.computeIfAbsent("Accept", key -> List.of("*/*"));
return filteredHeaders;
}
private Map<String, Collection<String>> castMapCollectType(Map<String, List<String>> map) {
final Map<String, Collection<String>> result = new HashMap<>();
map.forEach((key, value) -> result.put(key, new HashSet<>(value)));
return result;
}
private String[] asString(Map<String, Collection<String>> headers) {
return headers.entrySet().stream()
.flatMap(
entry ->
entry.getValue().stream()
.map(value -> Arrays.asList(entry.getKey(), value))
.flatMap(List::stream))
.toArray(String[]::new);
}
}