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Http2Client.java
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158 lines (135 loc) · 5.27 KB
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/**
* Copyright 2012-2019 The Feign Authors
*
* 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 java.io.ByteArrayInputStream;
import java.io.IOException;
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.util.*;
import java.util.function.Function;
import java.util.stream.Collectors;
import feign.*;
import feign.Request.Options;
public class Http2Client implements Client {
private final HttpClient client;
public Http2Client() {
this(HttpClient.newBuilder()
.followRedirects(Redirect.ALWAYS)
.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 = newRequestBuilder(request).build();
HttpResponse<byte[]> httpResponse;
try {
httpResponse = client.send(httpRequest, BodyHandlers.ofByteArray());
} catch (final InterruptedException e) {
throw new IOException("Invalid uri " + request.url(), e);
}
final OptionalLong length = httpResponse.headers().firstValueAsLong("Content-Length");
final Response response = Response.builder()
.body(new ByteArrayInputStream(httpResponse.body()),
length.isPresent() ? (int) length.getAsLong() : null)
.reason(httpResponse.headers().firstValue("Reason-Phrase").orElse("OK"))
.request(request)
.status(httpResponse.statusCode())
.headers(castMapCollectType(httpResponse.headers().map()))
.build();
return response;
}
private Builder newRequestBuilder(Request request) throws IOException {
URI uri;
try {
uri = new URI(request.url());
} catch (final URISyntaxException e) {
throw new IOException("Invalid uri " + request.url(), e);
}
final BodyPublisher body;
if (request.body() == null) {
body = BodyPublishers.noBody();
} else {
body = BodyPublishers.ofByteArray(request.body());
}
final Builder requestBuilder = HttpRequest.newBuilder()
.uri(uri)
.version(Version.HTTP_2);
final Map<String, Collection<String>> headers = filterRestrictedHeaders(request.headers());
if (!headers.isEmpty()) {
requestBuilder.headers(asString(headers));
}
switch (request.httpMethod()) {
case GET:
return requestBuilder.GET();
case POST:
return requestBuilder.POST(body);
case PUT:
return requestBuilder.PUT(body);
case DELETE:
return requestBuilder.DELETE();
default:
// fall back scenario, http implementations may restrict some methods
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;
static {
// A case insensitive TreeSet of strings.
final TreeSet<String> treeSet = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
treeSet.addAll(Set.of("connection", "content-length", "date", "expect", "from", "host",
"origin", "referer", "upgrade", "via", "warning"));
DISALLOWED_HEADERS_SET = 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))
.collect(Collectors.toList())
.toArray(new String[0]);
}
}