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Copy pathDefaultClient.java
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245 lines (224 loc) · 8.73 KB
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/*
* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
*
* 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;
import static feign.Util.ACCEPT_ENCODING;
import static feign.Util.CONTENT_ENCODING;
import static feign.Util.CONTENT_LENGTH;
import static feign.Util.ENCODING_DEFLATE;
import static feign.Util.ENCODING_GZIP;
import static java.lang.String.CASE_INSENSITIVE_ORDER;
import static java.lang.String.format;
import feign.Request.Options;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import java.util.zip.InflaterInputStream;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
public class DefaultClient implements Client {
private final SSLSocketFactory sslContextFactory;
private final HostnameVerifier hostnameVerifier;
/**
* Disable the request body internal buffering for {@code HttpURLConnection}.
*
* @see HttpURLConnection#setFixedLengthStreamingMode(int)
* @see HttpURLConnection#setFixedLengthStreamingMode(long)
* @see HttpURLConnection#setChunkedStreamingMode(int)
*/
private final boolean disableRequestBuffering;
/**
* Create a new client, which disable request buffering by default.
*
* @param sslContextFactory SSLSocketFactory for secure https URL connections.
* @param hostnameVerifier the host name verifier.
*/
public DefaultClient(SSLSocketFactory sslContextFactory, HostnameVerifier hostnameVerifier) {
this.sslContextFactory = sslContextFactory;
this.hostnameVerifier = hostnameVerifier;
this.disableRequestBuffering = true;
}
/**
* Create a new client.
*
* @param sslContextFactory SSLSocketFactory for secure https URL connections.
* @param hostnameVerifier the host name verifier.
* @param disableRequestBuffering Disable the request body internal buffering for {@code
* HttpURLConnection}.
*/
public DefaultClient(
SSLSocketFactory sslContextFactory,
HostnameVerifier hostnameVerifier,
boolean disableRequestBuffering) {
super();
this.sslContextFactory = sslContextFactory;
this.hostnameVerifier = hostnameVerifier;
this.disableRequestBuffering = disableRequestBuffering;
}
@Override
public Response execute(Request request, Options options) throws IOException {
HttpURLConnection connection = convertAndSend(request, options);
return convertResponse(connection, request);
}
Response convertResponse(HttpURLConnection connection, Request request) throws IOException {
int status = connection.getResponseCode();
String reason = connection.getResponseMessage();
if (status < 0) {
throw new IOException(
format(
"Invalid status(%s) executing %s %s",
status, connection.getRequestMethod(), connection.getURL()));
}
Map<String, Collection<String>> headers = new TreeMap<>(CASE_INSENSITIVE_ORDER);
for (Map.Entry<String, List<String>> field : connection.getHeaderFields().entrySet()) {
// response message
if (field.getKey() != null) {
headers.put(field.getKey(), field.getValue());
}
}
Integer length = connection.getContentLength();
if (length < 0) {
// -1 signals unknown or above Integer.MAX_VALUE; any other negative value is a malformed
// header that HttpURLConnection surfaces verbatim
length = null;
}
InputStream stream;
if (status >= 400) {
stream = connection.getErrorStream();
} else {
stream = connection.getInputStream();
}
if (stream != null && this.isGzip(headers.get(CONTENT_ENCODING))) {
stream = new GZIPInputStream(stream);
// the body is now decompressed, the Content-Length described the compressed bytes
length = null;
} else if (stream != null && this.isDeflate(headers.get(CONTENT_ENCODING))) {
stream = new InflaterInputStream(stream);
length = null;
}
return Response.builder()
.status(status)
.reason(reason)
.headers(headers)
.request(request)
.body(stream, length)
.build();
}
public HttpURLConnection getConnection(final URL url) throws IOException {
return (HttpURLConnection) url.openConnection();
}
HttpURLConnection convertAndSend(Request request, Options options) throws IOException {
final URL url = new URL(request.url());
final HttpURLConnection connection = this.getConnection(url);
if (connection instanceof HttpsURLConnection) {
HttpsURLConnection sslCon = (HttpsURLConnection) connection;
if (sslContextFactory != null) {
sslCon.setSSLSocketFactory(sslContextFactory);
}
if (hostnameVerifier != null) {
sslCon.setHostnameVerifier(hostnameVerifier);
}
}
connection.setConnectTimeout(options.connectTimeoutMillis());
connection.setReadTimeout(options.readTimeoutMillis());
connection.setAllowUserInteraction(false);
connection.setInstanceFollowRedirects(options.isFollowRedirects());
connection.setRequestMethod(request.httpMethod().name());
Collection<String> contentEncodingValues = request.headers().get(CONTENT_ENCODING);
boolean gzipEncodedRequest = this.isGzip(contentEncodingValues);
boolean deflateEncodedRequest = this.isDeflate(contentEncodingValues);
boolean hasAcceptHeader = false;
Integer contentLength = null;
for (String field : request.headers().keySet()) {
if (field.equalsIgnoreCase("Accept")) {
hasAcceptHeader = true;
}
for (String value : request.headers().get(field)) {
if (field.equalsIgnoreCase(CONTENT_LENGTH)) {
if (!gzipEncodedRequest && !deflateEncodedRequest) {
contentLength = Integer.valueOf(value);
}
}
// Avoid add "Accept-encoding" twice or more when "compression" option is enabled
else if (field.equals(ACCEPT_ENCODING)) {
connection.addRequestProperty(field, String.join(", ", request.headers().get(field)));
break;
} else {
connection.addRequestProperty(field, value);
}
}
}
// Some servers choke on the default accept string.
if (!hasAcceptHeader) {
connection.addRequestProperty("Accept", "*/*");
}
byte[] body = request.body();
if (body != null && body.length > 0) {
if (disableRequestBuffering) {
if (contentLength != null) {
connection.setFixedLengthStreamingMode(contentLength);
} else {
connection.setChunkedStreamingMode(8196);
}
}
connection.setDoOutput(true);
OutputStream out = connection.getOutputStream();
if (gzipEncodedRequest) {
out = new GZIPOutputStream(out);
} else if (deflateEncodedRequest) {
out = new DeflaterOutputStream(out);
}
try {
out.write(body);
} finally {
try {
out.close();
} catch (IOException suppressed) { // NOPMD
}
}
} else if (request.httpMethod().isWithBody()) {
/*
* Avoid calling connection.getOutputStream() for an empty body: HttpURLConnection defaults
* the Content-Type to application/x-www-form-urlencoded as soon as an output stream (a
* "poster") is created, even when zero bytes are written to it. Setting Content-Length
* directly ensures internal retry logic still applies to such requests, without triggering
* that default.
* To use this Header, set 'sun.net.http.allowRestrictedHeaders' property true.
*/
connection.addRequestProperty("Content-Length", "0");
}
return connection;
}
private boolean isGzip(Collection<String> contentEncodingValues) {
return contentEncodingValues != null
&& !contentEncodingValues.isEmpty()
&& contentEncodingValues.contains(ENCODING_GZIP);
}
private boolean isDeflate(Collection<String> contentEncodingValues) {
return contentEncodingValues != null
&& !contentEncodingValues.isEmpty()
&& contentEncodingValues.contains(ENCODING_DEFLATE);
}
}
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