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JdkHttpClientHttpLayer.java
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JdkHttpClientHttpLayer.java
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/*
* Copyright 2021 the original author or 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
*
* https://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 com.rabbitmq.http.client;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpClient.Builder;
import java.net.http.HttpClient.Redirect;
import java.net.http.HttpClient.Version;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.BodyPublishers;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.function.Consumer;
import java.util.function.Supplier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLParameters;
/**
* {@link HttpLayer} using JDK 11's {@link HttpClient}.
*
* @since 4.0.0
*/
public final class JdkHttpClientHttpLayer implements HttpLayer {
private static final Duration REQUEST_TIMEOUT = Duration.ofSeconds(60);
private static final Duration CONNECT_TIMEOUT = Duration.ofSeconds(30);
private final HttpClient client;
private final ObjectMapper mapper;
private final Consumer<HttpRequest.Builder> requestBuilderConsumer;
private JdkHttpClientHttpLayer(
HttpClient client,
ObjectMapper mapper,
Consumer<HttpRequest.Builder> requestBuilderConsumer) {
this.client = client;
this.mapper = mapper;
this.requestBuilderConsumer = requestBuilderConsumer;
}
static <T> T get(
URI uri,
ObjectMapper mapper,
HttpClient client,
Consumer<HttpRequest.Builder> requestBuilderConsumer,
Type type) {
HttpRequest.Builder requestBuilder = HttpRequest.newBuilder(uri);
requestBuilder.header("accept", "application/json");
requestBuilderConsumer.accept(requestBuilder);
HttpRequest request = requestBuilder.GET().build();
try {
HttpResponse<Supplier<T>> response =
client.send(request, new JsonBodyHandler<>(mapper, type));
int statusCode = response.statusCode();
if (statusCode == 404) {
return null;
} else if (statusCode == 200) {
return response.body().get();
} else {
int errorClass = errorClass(statusCode);
if (errorClass == 400) {
throw new HttpClientException(statusCode, "GET returned " + statusCode);
} else if (errorClass == 500) {
throw new HttpServerException(statusCode, "GET returned " + statusCode);
} else {
throw new HttpException("GET returned " + statusCode);
}
}
} catch (IOException e) {
throw new HttpException(e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new HttpException(e);
}
}
private static <W> java.net.http.HttpResponse.BodySubscriber<Supplier<W>> asJson(
ObjectMapper mapper, Type type) {
java.net.http.HttpResponse.BodySubscriber<InputStream> upstream =
java.net.http.HttpResponse.BodySubscribers.ofInputStream();
return java.net.http.HttpResponse.BodySubscribers.mapping(
upstream, inputStream -> toSupplierOfType(mapper, inputStream, type));
}
private static <W> Supplier<W> toSupplierOfType(
ObjectMapper mapper, InputStream inputStream, Type type) {
return () -> {
try (InputStream stream = inputStream) {
return mapper.readValue(stream, mapper.constructType(type));
} catch (IOException e) {
throw new HttpException(e);
}
};
}
static void maybeThrowClientServerException(int statusCode, String message, int... ignores) {
for (int ignore : ignores) {
if (statusCode == ignore) {
return;
}
}
int errorClass = errorClass(statusCode);
if (errorClass == 400) {
throw new HttpClientException(statusCode, message);
} else if (errorClass == 500) {
throw new HttpServerException(statusCode, message);
}
}
private static int errorClass(int statusCode) {
return statusCode - statusCode % 100;
}
/**
* Configure the default {@link HttpLayer} implementation.
*
* @return a configuration instance
*/
public static Configuration configure() {
return new Configuration();
}
public static String authorization(String username, String password) {
return "Basic " + Utils.base64(username + ":" + password);
}
@Override
public <T> T get(URI uri, Class<T> responseClass) {
return get(uri, this.mapper, this.client, this.requestBuilderConsumer, responseClass);
}
@Override
public <T> T get(URI uri, ParameterizedTypeReference<T> typeReference) {
return get(uri, this.mapper, this.client, this.requestBuilderConsumer, typeReference.getType());
}
@Override
public <T> T post(URI uri, Object requestBody, Class<T> responseClass) {
HttpRequest.Builder requestBuilder = HttpRequest.newBuilder(uri);
requestBuilder.header("content-type", "application/json");
requestBuilderConsumer.accept(requestBuilder);
try {
HttpRequest request =
requestBuilder
.POST(BodyPublishers.ofByteArray(mapper.writeValueAsBytes(requestBody)))
.build();
if (responseClass == null) {
HttpResponse<Void> response = client.send(request, BodyHandlers.discarding());
int statusCode = response.statusCode();
maybeThrowClientServerException(statusCode, "POST returned " + statusCode);
return null;
} else {
HttpResponse<Supplier<T>> response =
client.send(request, new JsonBodyHandler<>(mapper, responseClass));
int statusCode = response.statusCode();
maybeThrowClientServerException(statusCode, "POST returned " + statusCode);
return response.body().get();
}
} catch (IOException e) {
throw new HttpException(e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new HttpException(e);
}
}
@Override
public void put(URI uri, Object requestBody) {
HttpRequest.Builder requestBuilder = HttpRequest.newBuilder(uri);
requestBuilder.header("content-type", "application/json");
requestBuilderConsumer.accept(requestBuilder);
try {
HttpRequest request =
requestBuilder
.PUT(BodyPublishers.ofByteArray(mapper.writeValueAsBytes(requestBody)))
.build();
HttpResponse<Void> response = client.send(request, BodyHandlers.discarding());
int statusCode = response.statusCode();
maybeThrowClientServerException(statusCode, "PUT returned " + statusCode);
} catch (IOException e) {
throw new HttpException(e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new HttpException(e);
}
}
@Override
public void delete(URI uri, Map<String, String> headers) {
headers = headers == null ? Collections.emptyMap() : headers;
HttpRequest.Builder requestBuilder = HttpRequest.newBuilder(uri);
headers.forEach((n, v) -> requestBuilder.header(n, v));
requestBuilderConsumer.accept(requestBuilder);
try {
HttpRequest request = requestBuilder.DELETE().build();
HttpResponse<Void> response = client.send(request, BodyHandlers.discarding());
int statusCode = response.statusCode();
maybeThrowClientServerException(statusCode, "DELETE returned " + statusCode, 404);
} catch (IOException e) {
throw new HttpException(e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new HttpException(e);
}
}
private static class Factory implements HttpLayerFactory {
private final Consumer<HttpClient.Builder> clientBuilderConsumer;
private final Consumer<HttpRequest.Builder> requestBuilderConsumer;
Factory(
Consumer<HttpClient.Builder> clientBuilderConsumer,
Consumer<HttpRequest.Builder> requestBuilderConsumer) {
this.clientBuilderConsumer = clientBuilderConsumer;
this.requestBuilderConsumer = requestBuilderConsumer;
}
@Override
public HttpLayer create(ClientParameters parameters) {
HttpClient.Builder builder =
HttpClient.newBuilder()
.version(Version.HTTP_1_1)
.followRedirects(Redirect.NORMAL)
.connectTimeout(CONNECT_TIMEOUT);
this.clientBuilderConsumer.accept(builder);
HttpClient client = builder.build();
ObjectMapper mapper = JsonUtils.createDefaultObjectMapper();
String username = parameters.getUsername();
String password = parameters.getPassword();
Consumer<HttpRequest.Builder> requestBuilderConsumer;
if (this.requestBuilderConsumer == null) {
requestBuilderConsumer =
requestBuilder ->
requestBuilder
.timeout(REQUEST_TIMEOUT)
.setHeader("Authorization", authorization(username, password));
} else {
requestBuilderConsumer = this.requestBuilderConsumer;
}
return new JdkHttpClientHttpLayer(client, mapper, requestBuilderConsumer);
}
}
private static class JsonBodyHandler<W>
implements java.net.http.HttpResponse.BodyHandler<Supplier<W>> {
private final ObjectMapper mapper;
private final Type type;
public JsonBodyHandler(ObjectMapper mapper, Type type) {
this.mapper = mapper;
this.type = type;
}
@Override
public java.net.http.HttpResponse.BodySubscriber<Supplier<W>> apply(
HttpResponse.ResponseInfo responseInfo) {
return asJson(mapper, type);
}
}
/**
* Class to configure the default {@link HttpLayer} implementation.
*
* @see JdkHttpClientHttpLayer
*/
public static class Configuration {
private Consumer<Builder> clientBuilderConsumer = b -> {};
private Consumer<HttpRequest.Builder> requestBuilderConsumer = null;
/**
* Callback to configure the {@link Builder}.
*
* <p>The client can be configured to use TLS with this callback. Use the {@link
* Builder#sslContext(SSLContext)} and {@link Builder#sslParameters(SSLParameters)} methods to
* configure TLS appropriately.
*
* <p>Use the {@link SSLParameters#setEndpointIdentificationAlgorithm(String)} method with the
* <code>HTTPS</code> value to enable server hostname verification.
*
* @param clientBuilderConsumer
* @return this configuration instance
*/
public Configuration clientBuilderConsumer(Consumer<Builder> clientBuilderConsumer) {
if (clientBuilderConsumer == null) {
throw new IllegalArgumentException("Client builder consumer cannot be null");
}
this.clientBuilderConsumer = clientBuilderConsumer;
return this;
}
/**
* Callback to configure the {@link HttpRequest.Builder}.
*
* @param requestBuilderConsumer
* @return the configuration instance
*/
public Configuration requestBuilderConsumer(
Consumer<HttpRequest.Builder> requestBuilderConsumer) {
if (requestBuilderConsumer == null) {
throw new IllegalArgumentException("Request builder consumer cannot be null");
}
this.requestBuilderConsumer = requestBuilderConsumer;
return this;
}
HttpLayerFactory create() {
return new Factory(this.clientBuilderConsumer, this.requestBuilderConsumer);
}
}
}