JDK14/Java14源码在线阅读
/*
* Copyright (c) 2005, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.net.httpserver;
import java.io.*;
import java.net.*;
import javax.net.ssl.*;
import java.util.*;
import java.lang.System.Logger;
import java.lang.System.Logger.Level;
import java.text.*;
import java.util.stream.Stream;
import com.sun.net.httpserver.*;
class ExchangeImpl {
Headers reqHdrs, rspHdrs;
Request req;
String method;
boolean writefinished;
URI uri;
HttpConnection connection;
long reqContentLen;
long rspContentLen;
/* raw streams which access the socket directly */
InputStream ris;
OutputStream ros;
Thread thread;
/* close the underlying connection when this exchange finished */
boolean close;
boolean closed;
boolean http10 = false;
/* for formatting the Date: header */
private static final String pattern = "EEE, dd MMM yyyy HH:mm:ss zzz";
private static final TimeZone gmtTZ = TimeZone.getTimeZone("GMT");
private static final ThreadLocal<DateFormat> dateFormat =
new ThreadLocal<DateFormat>() {
@Override protected DateFormat initialValue() {
DateFormat df = new SimpleDateFormat(pattern, Locale.US);
df.setTimeZone(gmtTZ);
return df;
}
};
private static final String HEAD = "HEAD";
/* streams which take care of the HTTP protocol framing
* and are passed up to higher layers
*/
InputStream uis;
OutputStream uos;
LeftOverInputStream uis_orig; // uis may have be a user supplied wrapper
PlaceholderOutputStream uos_orig;
boolean sentHeaders; /* true after response headers sent */
Map<String,Object> attributes;
int rcode = -1;
HttpPrincipal principal;
ServerImpl server;
ExchangeImpl (
String m, URI u, Request req, long len, HttpConnection connection
) throws IOException {
this.req = req;
this.reqHdrs = req.headers();
this.rspHdrs = new Headers();
this.method = m;
this.uri = u;
this.connection = connection;
this.reqContentLen = len;
/* ros only used for headers, body written directly to stream */
this.ros = req.outputStream();
this.ris = req.inputStream();
server = getServerImpl();
server.startExchange();
}
public Headers getRequestHeaders () {
return new UnmodifiableHeaders (reqHdrs);
}
public Headers getResponseHeaders () {
return rspHdrs;
}
public URI getRequestURI () {
return uri;
}
public String getRequestMethod (){
return method;
}
public HttpContextImpl getHttpContext (){
return connection.getHttpContext();
}
private boolean isHeadRequest() {
return HEAD.equals(getRequestMethod());
}
public void close () {
if (closed) {
return;
}
closed = true;
/* close the underlying connection if,
* a) the streams not set up yet, no response can be sent, or
* b) if the wrapper output stream is not set up, or
* c) if the close of the input/outpu stream fails
*/
try {
if (uis_orig == null || uos == null) {
connection.close();
return;
}
if (!uos_orig.isWrapped()) {
connection.close();
return;
}
if (!uis_orig.isClosed()) {
uis_orig.close();
}
uos.close();
} catch (IOException e) {
connection.close();
}
}
public InputStream getRequestBody () {
if (uis != null) {
return uis;
}
if (reqContentLen == -1L) {
uis_orig = new ChunkedInputStream (this, ris);
uis = uis_orig;
} else {
uis_orig = new FixedLengthInputStream (this, ris, reqContentLen);
uis = uis_orig;
}
return uis;
}
LeftOverInputStream getOriginalInputStream () {
return uis_orig;
}
public int getResponseCode () {
return rcode;
}
public OutputStream getResponseBody () {
/* TODO. Change spec to remove restriction below. Filters
* cannot work with this restriction
*
* if (!sentHeaders) {
* throw new IllegalStateException ("headers not sent");
* }
*/
if (uos == null) {
uos_orig = new PlaceholderOutputStream (null);
uos = uos_orig;
}
return uos;
}
/* returns the place holder stream, which is the stream
* returned from the 1st call to getResponseBody()
* The "real" ouputstream is then placed inside this
*/
PlaceholderOutputStream getPlaceholderResponseBody () {
getResponseBody();
return uos_orig;
}
public void sendResponseHeaders (int rCode, long contentLen)
throws IOException
{
if (sentHeaders) {
throw new IOException ("headers already sent");
}
this.rcode = rCode;
String statusLine = "HTTP/1.1 "+rCode+Code.msg(rCode)+"\r\n";
OutputStream tmpout = new BufferedOutputStream (ros);
PlaceholderOutputStream o = getPlaceholderResponseBody();
tmpout.write (bytes(statusLine, 0), 0, statusLine.length());
boolean noContentToSend = false; // assume there is content
boolean noContentLengthHeader = false; // must not send Content-length is set
rspHdrs.set ("Date", dateFormat.get().format (new Date()));
/* check for response type that is not allowed to send a body */
if ((rCode>=100 && rCode <200) /* informational */
||(rCode == 204) /* no content */
||(rCode == 304)) /* not modified */
{
if (contentLen != -1) {
Logger logger = server.getLogger();
String msg = "sendResponseHeaders: rCode = "+ rCode
+ ": forcing contentLen = -1";
logger.log (Level.WARNING, msg);
}
contentLen = -1;
noContentLengthHeader = (rCode != 304);
}
if (isHeadRequest() || rCode == 304) {
/* HEAD requests or 304 responses should not set a content length by passing it
* through this API, but should instead manually set the required
* headers.*/
if (contentLen >= 0) {
final Logger logger = server.getLogger();
String msg =
"sendResponseHeaders: being invoked with a content length for a HEAD request";
logger.log (Level.WARNING, msg);
}
noContentToSend = true;
contentLen = 0;
} else { /* not a HEAD request or 304 response */
if (contentLen == 0) {
if (http10) {
o.setWrappedStream (new UndefLengthOutputStream (this, ros));
close = true;
} else {
rspHdrs.set ("Transfer-encoding", "chunked");
o.setWrappedStream (new ChunkedOutputStream (this, ros));
}
} else {
if (contentLen == -1) {
noContentToSend = true;
contentLen = 0;
}
if (!noContentLengthHeader) {
rspHdrs.set("Content-length", Long.toString(contentLen));
}
o.setWrappedStream (new FixedLengthOutputStream (this, ros, contentLen));
}
}
// A custom handler can request that the connection be
// closed after the exchange by supplying Connection: close
// to the response header. Nothing to do if the exchange is
// already set up to be closed.
if (!close) {
Stream<String> conheader =
Optional.ofNullable(rspHdrs.get("Connection"))
.map(List::stream).orElse(Stream.empty());
if (conheader.anyMatch("close"::equalsIgnoreCase)) {
Logger logger = server.getLogger();
logger.log (Level.DEBUG, "Connection: close requested by handler");
close = true;
}
}
write (rspHdrs, tmpout);
this.rspContentLen = contentLen;
tmpout.flush() ;
tmpout = null;
sentHeaders = true;
if (noContentToSend) {
WriteFinishedEvent e = new WriteFinishedEvent (this);
server.addEvent (e);
closed = true;
}
server.logReply (rCode, req.requestLine(), null);
}
void write (Headers map, OutputStream os) throws IOException {
Set<Map.Entry<String,List<String>>> entries = map.entrySet();
for (Map.Entry<String,List<String>> entry : entries) {
String key = entry.getKey();
byte[] buf;
List<String> values = entry.getValue();
for (String val : values) {
int i = key.length();
buf = bytes (key, 2);
buf[i++] = ':';
buf[i++] = ' ';
os.write (buf, 0, i);
buf = bytes (val, 2);
i = val.length();
buf[i++] = '\r';
buf[i++] = '\n';
os.write (buf, 0, i);
}
}
os.write ('\r');
os.write ('\n');
}
private byte[] rspbuf = new byte [128]; // used by bytes()
/**
* convert string to byte[], using rspbuf
* Make sure that at least "extra" bytes are free at end
* of rspbuf. Reallocate rspbuf if not big enough.
* caller must check return value to see if rspbuf moved
*/
private byte[] bytes (String s, int extra) {
int slen = s.length();
if (slen+extra > rspbuf.length) {
int diff = slen + extra - rspbuf.length;
rspbuf = new byte [2* (rspbuf.length + diff)];
}
char c[] = s.toCharArray();
for (int i=0; i<c.length; i++) {
rspbuf[i] = (byte)c[i];
}
return rspbuf;
}
public InetSocketAddress getRemoteAddress (){
Socket s = connection.getChannel().socket();
InetAddress ia = s.getInetAddress();
int port = s.getPort();
return new InetSocketAddress (ia, port);
}
public InetSocketAddress getLocalAddress (){
Socket s = connection.getChannel().socket();
InetAddress ia = s.getLocalAddress();
int port = s.getLocalPort();
return new InetSocketAddress (ia, port);
}
public String getProtocol (){
String reqline = req.requestLine();
int index = reqline.lastIndexOf (' ');
return reqline.substring (index+1);
}
public SSLSession getSSLSession () {
SSLEngine e = connection.getSSLEngine();
if (e == null) {
return null;
}
return e.getSession();
}
public Object getAttribute (String name) {
if (name == null) {
throw new NullPointerException ("null name parameter");
}
if (attributes == null) {
attributes = getHttpContext().getAttributes();
}
return attributes.get (name);
}
public void setAttribute (String name, Object value) {
if (name == null) {
throw new NullPointerException ("null name parameter");
}
if (attributes == null) {
attributes = getHttpContext().getAttributes();
}
attributes.put (name, value);
}
public void setStreams (InputStream i, OutputStream o) {
assert uis != null;
if (i != null) {
uis = i;
}
if (o != null) {
uos = o;
}
}
/**
* PP
*/
HttpConnection getConnection () {
return connection;
}
ServerImpl getServerImpl () {
return getHttpContext().getServerImpl();
}
public HttpPrincipal getPrincipal () {
return principal;
}
void setPrincipal (HttpPrincipal principal) {
this.principal = principal;
}
static ExchangeImpl get (HttpExchange t) {
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