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/*
* Copyright 2012-2023 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;
import static feign.Util.CONTENT_ENCODING;
import static feign.Util.ACCEPT_ENCODING;
import static feign.Util.CONTENT_LENGTH;
import static feign.Util.ENCODING_DEFLATE;
import static feign.Util.ENCODING_GZIP;
import static feign.Util.checkArgument;
import static feign.Util.checkNotNull;
import static feign.Util.isNotBlank;
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.Proxy;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
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;
/**
* Submits HTTP {@link Request requests}. Implementations are expected to be thread-safe.
*/
public interface Client {
/**
* Executes a request against its {@link Request#url() url} and returns a response.
*
* @param request safe to replay.
* @param options options to apply to this request.
* @return connected response, {@link Response.Body} is absent or unread.
* @throws IOException on a network error connecting to {@link Request#url()}.
*/
Response execute(Request request, Options options) throws IOException;
class Default 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 Default(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 Default(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 == -1) {
length = null;
}
InputStream stream;
if (status >= 400) {
stream = connection.getErrorStream();
} else {
stream = connection.getInputStream();
}
if (this.isGzip(headers.get(CONTENT_ENCODING))) {
stream = new GZIPInputStream(stream);
} else if (this.isDeflate(headers.get(CONTENT_ENCODING))) {
stream = new InflaterInputStream(stream);
}
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.equals(CONTENT_LENGTH)) {
if (!gzipEncodedRequest && !deflateEncodedRequest) {
contentLength = Integer.valueOf(value);
connection.addRequestProperty(field, value);
}
}
// Avoid add "Accept-encoding" twice or more when "compression" option is enabled
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", "*/*");
}
boolean hasEmptyBody = false;
byte[] body = request.body();
if (body == null && request.httpMethod().isWithBody()) {
body = new byte[0];
hasEmptyBody = true;
}
if (body != null) {
/*
* Ignore disableRequestBuffering flag if the empty body was set, to ensure that internal
* retry logic applies to such requests.
*/
if (disableRequestBuffering && !hasEmptyBody) {
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
}
}
}
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);
}
}
/**
* Client that supports a {@link java.net.Proxy}.
*/
class Proxied extends Default {
public static final String PROXY_AUTHORIZATION = "Proxy-Authorization";
private final Proxy proxy;
private String credentials;
public Proxied(SSLSocketFactory sslContextFactory, HostnameVerifier hostnameVerifier,
Proxy proxy) {
super(sslContextFactory, hostnameVerifier);
checkNotNull(proxy, "a proxy is required.");
this.proxy = proxy;
}
public Proxied(SSLSocketFactory sslContextFactory, HostnameVerifier hostnameVerifier,
Proxy proxy, String proxyUser, String proxyPassword) {
this(sslContextFactory, hostnameVerifier, proxy);
checkArgument(isNotBlank(proxyUser), "proxy user is required.");
checkArgument(isNotBlank(proxyPassword), "proxy password is required.");
this.credentials = basic(proxyUser, proxyPassword);
}
@Override
public HttpURLConnection getConnection(URL url) throws IOException {
HttpURLConnection connection = (HttpURLConnection) url.openConnection(this.proxy);
if (isNotBlank(this.credentials)) {
connection.addRequestProperty(PROXY_AUTHORIZATION, this.credentials);
}
return connection;
}
public String getCredentials() {
return this.credentials;
}
private String basic(String username, String password) {
String token = username + ":" + password;
byte[] bytes = token.getBytes(StandardCharsets.ISO_8859_1);
String encoded = Base64.getEncoder().encodeToString(bytes);
return "Basic " + encoded;
}
}
}