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com.sun.webkit.network.URLLoader Maven / Gradle / Ivy
/*
* Copyright (c) 2011, 2018, 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 com.sun.webkit.network;
import com.sun.javafx.logging.PlatformLogger;
import com.sun.javafx.logging.PlatformLogger.Level;
import com.sun.webkit.Invoker;
import com.sun.webkit.LoadListenerClient;
import com.sun.webkit.WebPage;
import static com.sun.webkit.network.URLs.newURL;
import java.io.EOFException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.annotation.Native;
import java.net.ConnectException;
import java.net.HttpRetryException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.NoRouteToHostException;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.security.AccessControlException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.zip.GZIPInputStream;
import java.util.zip.InflaterInputStream;
import javax.net.ssl.SSLHandshakeException;
/**
* A runnable that loads a resource specified by a URL.
*/
final class URLLoader implements Runnable {
@Native public static final int ALLOW_UNASSIGNED = java.net.IDN.ALLOW_UNASSIGNED;
private static final PlatformLogger logger =
PlatformLogger.getLogger(URLLoader.class.getName());
private static final int MAX_REDIRECTS = 10;
private static final int MAX_BUF_COUNT = 3;
private static final String GET = "GET";
private static final String HEAD = "HEAD";
private static final String DELETE = "DELETE";
private final WebPage webPage;
private final ByteBufferPool byteBufferPool;
private final boolean asynchronous;
private String url;
private String method;
private final String headers;
private FormDataElement[] formDataElements;
private final long data;
private volatile boolean canceled = false;
/**
* Creates a new {@code URLLoader}.
*/
URLLoader(WebPage webPage,
ByteBufferPool byteBufferPool,
boolean asynchronous,
String url,
String method,
String headers,
FormDataElement[] formDataElements,
long data)
{
this.webPage = webPage;
this.byteBufferPool = byteBufferPool;
this.asynchronous = asynchronous;
this.url = url;
this.method = method;
this.headers = headers;
this.formDataElements = formDataElements;
this.data = data;
}
/**
* Cancels this loader.
*/
private void fwkCancel() {
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format("data: [0x%016X]", data));
}
canceled = true;
}
/**
* {@inheritDoc}
*/
@Override
public void run() {
// Run the loader in the page's access control context
AccessController.doPrivileged((PrivilegedAction) () -> {
doRun();
return null;
}, webPage.getAccessControlContext());
}
/**
* Executes this loader.
*/
private void doRun() {
Throwable error = null;
int errorCode = 0;
try {
int redirectCount = 0;
boolean streaming = true;
boolean connectionResetRetry = true;
while (true) {
// RT-14438
String actualUrl = url;
if (url.startsWith("file:")) {
int questionMarkPosition = url.indexOf('?');
if (questionMarkPosition != -1) {
actualUrl = url.substring(0, questionMarkPosition);
}
}
URL urlObject = newURL(actualUrl);
// RT-22458
workaround7177996(urlObject);
URLConnection c = urlObject.openConnection();
prepareConnection(c);
Redirect redirect = null;
try {
sendRequest(c, streaming);
redirect = receiveResponse(c);
} catch (HttpRetryException ex) {
// RT-19914
if (streaming) {
streaming = false;
continue; // retry without streaming
} else {
throw ex;
}
} catch (SocketException ex) {
// SocketException: Connection reset, Retry once
if ("Connection reset".equals(ex.getMessage()) && connectionResetRetry) {
connectionResetRetry = false;
continue;
} else {
throw ex;
}
} finally {
close(c);
}
if (redirect != null) {
if (redirectCount++ >= MAX_REDIRECTS) {
throw new TooManyRedirectsException();
}
boolean resetRequest = !redirect.preserveRequest
&& !method.equals(GET) && !method.equals(HEAD);
String newMethod = resetRequest ? GET : method;
willSendRequest(redirect.url, newMethod, c);
// willSendRequest() may cancel this loader
if (canceled) {
break;
}
url = redirect.url;
method = newMethod;
formDataElements = resetRequest ? null : formDataElements;
} else {
break;
}
}
} catch (MalformedURLException ex) {
error = ex;
errorCode = LoadListenerClient.MALFORMED_URL;
} catch (AccessControlException ex) {
error = ex;
errorCode = LoadListenerClient.PERMISSION_DENIED;
} catch (UnknownHostException ex) {
error = ex;
errorCode = LoadListenerClient.UNKNOWN_HOST;
} catch (NoRouteToHostException ex) {
error = ex;
errorCode = LoadListenerClient.NO_ROUTE_TO_HOST;
} catch (ConnectException ex) {
error = ex;
errorCode = LoadListenerClient.CONNECTION_REFUSED;
} catch (SocketException ex) {
error = ex;
errorCode = LoadListenerClient.CONNECTION_RESET;
} catch (SSLHandshakeException ex) {
error = ex;
errorCode = LoadListenerClient.SSL_HANDSHAKE;
} catch (SocketTimeoutException ex) {
error = ex;
errorCode = LoadListenerClient.CONNECTION_TIMED_OUT;
} catch (InvalidResponseException ex) {
error = ex;
errorCode = LoadListenerClient.INVALID_RESPONSE;
} catch (TooManyRedirectsException ex) {
error = ex;
errorCode = LoadListenerClient.TOO_MANY_REDIRECTS;
} catch (FileNotFoundException ex) {
error = ex;
errorCode = LoadListenerClient.FILE_NOT_FOUND;
} catch (Throwable th) {
error = th;
errorCode = LoadListenerClient.UNKNOWN_ERROR;
}
if (error != null) {
if (errorCode == LoadListenerClient.UNKNOWN_ERROR) {
logger.warning("Unexpected error", error);
} else {
logger.finest("Load error", error);
}
didFail(errorCode, error.getMessage());
}
}
private static void workaround7177996(URL url)
throws FileNotFoundException
{
if (!url.getProtocol().equals("file")) {
return;
}
String host = url.getHost();
if (host == null || host.equals("") || host.equals("~")
|| host.equalsIgnoreCase("localhost") )
{
return;
}
if (System.getProperty("os.name").startsWith("Windows")) {
String path = null;
try {
path = URLDecoder.decode(url.getPath(), "UTF-8");
} catch (UnsupportedEncodingException e) {
// The system should always have the platform default
}
path = path.replace('/', '\\');
path = path.replace('|', ':');
File file = new File("\\\\" + host + path);
if (!file.exists()) {
throw new FileNotFoundException("File not found: " + url);
}
} else {
throw new FileNotFoundException("File not found: " + url);
}
}
/**
* Prepares a connection.
*/
private void prepareConnection(URLConnection c) throws IOException {
// The following two timeouts are quite arbitrary and should
// probably be configurable via an API
c.setConnectTimeout(30000); // 30 seconds
c.setReadTimeout(60000 * 60); // 60 minutes
// Given that WebKit has its own cache, do not use
// any URLConnection caches, even if someone installs them.
// As a side effect, this fixes the problem of WebPane not
// working well with the plug-in cache, which was one of
// the causes for RT-11880.
c.setUseCaches(false);
Locale loc = Locale.getDefault();
String lang = "";
if (!loc.equals(Locale.US) && !loc.equals(Locale.ENGLISH)) {
lang = loc.getCountry().isEmpty() ?
loc.getLanguage() + ",":
loc.getLanguage() + "-" + loc.getCountry() + ",";
}
c.setRequestProperty("Accept-Language", lang.toLowerCase() + "en-us;q=0.8,en;q=0.7");
c.setRequestProperty("Accept-Encoding", "gzip");
c.setRequestProperty("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
if (headers != null && headers.length() > 0) {
for (String h : headers.split("\n")) {
int i = h.indexOf(':');
if (i > 0) {
c.addRequestProperty(h.substring(0, i), h.substring(i + 2));
}
}
}
if (c instanceof HttpURLConnection) {
HttpURLConnection httpConnection = (HttpURLConnection) c;
httpConnection.setRequestMethod(method);
// There are too many bugs in the way HttpURLConnection handles
// redirects, so we will deal with them ourselves
httpConnection.setInstanceFollowRedirects(false);
}
}
/**
* Sends request to the server.
*/
private void sendRequest(URLConnection c, boolean streaming)
throws IOException
{
OutputStream out = null;
try {
long bytesToBeSent = 0;
boolean sendFormData = formDataElements != null
&& c instanceof HttpURLConnection
&& !method.equals(DELETE);
boolean isGetOrHead = method.equals(GET) || method.equals(HEAD);
if (sendFormData) {
c.setDoOutput(true);
for (FormDataElement formDataElement : formDataElements) {
formDataElement.open();
bytesToBeSent += formDataElement.getSize();
}
if (streaming) {
HttpURLConnection http = (HttpURLConnection) c;
if (bytesToBeSent <= Integer.MAX_VALUE) {
http.setFixedLengthStreamingMode((int) bytesToBeSent);
} else {
http.setChunkedStreamingMode(0);
}
}
} else if (!isGetOrHead && (c instanceof HttpURLConnection)) {
c.setRequestProperty("Content-Length", "0");
}
int maxTryCount = isGetOrHead ? 3 : 1;
c.setConnectTimeout(c.getConnectTimeout() / maxTryCount);
int tryCount = 0;
while (!canceled) {
try {
c.connect();
break;
} catch (SocketTimeoutException ex) {
if (++tryCount >= maxTryCount) {
throw ex;
}
} catch (IllegalArgumentException ex) {
// Happens with some malformed URLs
throw new MalformedURLException(url);
}
}
if (sendFormData) {
out = c.getOutputStream();
byte[] buffer = new byte[4096];
long bytesSent = 0;
for (FormDataElement formDataElement : formDataElements) {
InputStream in = formDataElement.getInputStream();
int count;
while ((count = in.read(buffer)) > 0) {
out.write(buffer, 0, count);
bytesSent += count;
didSendData(bytesSent, bytesToBeSent);
}
formDataElement.close();
}
out.flush();
out.close();
out = null;
}
} finally {
if (out != null) {
try {
out.close();
} catch (IOException ignore) {}
}
if (formDataElements != null && c instanceof HttpURLConnection) {
for (FormDataElement formDataElement : formDataElements) {
try {
formDataElement.close();
} catch (IOException ignore) {}
}
}
}
}
/**
* Receives response from the server.
*/
private Redirect receiveResponse(URLConnection c)
throws IOException, InterruptedException
{
if (canceled) {
return null;
}
InputStream errorStream = null;
if (c instanceof HttpURLConnection) {
HttpURLConnection http = (HttpURLConnection) c;
int code = http.getResponseCode();
if (code == -1) {
throw new InvalidResponseException();
}
if (canceled) {
return null;
}
// See RT-17435
switch (code) {
case 301: // Moved Permanently
case 302: // Found
case 303: // See Other
case 307: // Temporary Redirect
String newLoc = http.getHeaderField("Location");
if (newLoc != null) {
URL newUrl;
try {
newUrl = newURL(newLoc);
} catch (MalformedURLException mue) {
// Try to treat newLoc as a relative URI to conform
// to popular browsers
newUrl = newURL(c.getURL(), newLoc);
}
return new Redirect(newUrl.toExternalForm(),
code == 307);
}
break;
case 304: // Not Modified
didReceiveResponse(c);
didFinishLoading();
return null;
}
if (code >= 400 && !method.equals(HEAD)) {
errorStream = http.getErrorStream();
}
}
// Let's see if it's an ftp (or ftps) URL and we need to transform
// a directory listing into HTML
if (url.startsWith("ftp:") || url.startsWith("ftps:")) {
boolean dir = false;
boolean notsure = false;
// Unfortunately, there is no clear way to determine if we are
// accessing a directory, so a bit of guessing is in order
String path = c.getURL().getPath();
if (path == null || path.isEmpty() || path.endsWith("/")
|| path.contains(";type=d"))
{
dir = true;
} else {
String type = c.getContentType();
if ("text/plain".equalsIgnoreCase(type)
|| "text/html".equalsIgnoreCase(type))
{
dir = true;
notsure = true;
}
}
if (dir) {
c = new DirectoryURLConnection(c, notsure);
}
}
// Same is true for FileURLConnection
if (url.startsWith("file:")) {
if("text/plain".equals(c.getContentType())
&& c.getHeaderField("content-length") == null)
{
// It is a directory
c = new DirectoryURLConnection(c);
}
}
didReceiveResponse(c);
if (method.equals(HEAD)) {
didFinishLoading();
return null;
}
InputStream inputStream = null;
try {
inputStream = errorStream == null
? c.getInputStream() : errorStream;
} catch (HttpRetryException ex) {
// HttpRetryException is handled from doRun() method.
// Hence rethrowing the exception to caller(doRun() method)
throw ex;
} catch (IOException e) {
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format("Exception caught: [%s], %s",
e.getClass().getSimpleName(),
e.getMessage()));
}
}
String encoding = c.getContentEncoding();
if (inputStream != null) {
try {
if ("gzip".equalsIgnoreCase(encoding)) {
inputStream = new GZIPInputStream(inputStream);
} else if ("deflate".equalsIgnoreCase(encoding)) {
inputStream = new InflaterInputStream(inputStream);
}
} catch (IOException e) {
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format("Exception caught: [%s], %s",
e.getClass().getSimpleName(),
e.getMessage()));
}
}
}
ByteBufferAllocator allocator =
byteBufferPool.newAllocator(MAX_BUF_COUNT);
ByteBuffer byteBuffer = null;
try {
if (inputStream != null) {
// 8192 is the default size of a BufferedInputStream used in
// most URLConnections, by using the same size, we avoid quite
// a few System.arrayCopy() calls
byte[] buffer = new byte[8192];
while (!canceled) {
int count;
try {
count = inputStream.read(buffer);
} catch (EOFException ex) {
// can be thrown by GZIPInputStream signaling
// the end of the stream
count = -1;
}
if (count == -1) {
break;
}
if (byteBuffer == null) {
byteBuffer = allocator.allocate();
}
int remaining = byteBuffer.remaining();
if (count < remaining) {
byteBuffer.put(buffer, 0, count);
} else {
byteBuffer.put(buffer, 0, remaining);
byteBuffer.flip();
didReceiveData(byteBuffer, allocator);
byteBuffer = null;
int outstanding = count - remaining;
if (outstanding > 0) {
byteBuffer = allocator.allocate();
byteBuffer.put(buffer, remaining, outstanding);
}
}
}
}
if (!canceled) {
if (byteBuffer != null && byteBuffer.position() > 0) {
byteBuffer.flip();
didReceiveData(byteBuffer, allocator);
byteBuffer = null;
}
didFinishLoading();
}
} finally {
if (byteBuffer != null) {
byteBuffer.clear();
allocator.release(byteBuffer);
}
}
return null;
}
/**
* Releases the resources that may be associated with a connection.
*/
private static void close(URLConnection c) {
if (c instanceof HttpURLConnection) {
InputStream errorStream = ((HttpURLConnection) c).getErrorStream();
if (errorStream != null) {
try {
errorStream.close();
} catch (IOException ignore) {}
}
}
try {
c.getInputStream().close();
} catch (IOException ignore) {}
}
/**
* A holder for redirect information.
*/
private static final class Redirect {
private final String url;
private final boolean preserveRequest;
private Redirect(String url, boolean preserveRequest) {
this.url = url;
this.preserveRequest = preserveRequest;
}
}
/**
* Signals an invalid response from the server.
*/
private static final class InvalidResponseException extends IOException {
private InvalidResponseException() {
super("Invalid server response");
}
}
/**
* Signals that too many redirects have been encountered
* while processing the request.
*/
private static final class TooManyRedirectsException extends IOException {
private TooManyRedirectsException() {
super("Too many redirects");
}
}
private void didSendData(final long totalBytesSent,
final long totalBytesToBeSent)
{
callBack(() -> {
if (!canceled) {
notifyDidSendData(totalBytesSent, totalBytesToBeSent);
}
});
}
private void notifyDidSendData(long totalBytesSent,
long totalBytesToBeSent)
{
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format(
"totalBytesSent: [%d], "
+ "totalBytesToBeSent: [%d], "
+ "data: [0x%016X]",
totalBytesSent,
totalBytesToBeSent,
data));
}
twkDidSendData(totalBytesSent, totalBytesToBeSent, data);
}
private void willSendRequest(String newUrl,
final String newMethod,
URLConnection c) throws InterruptedException
{
final String adjustedNewUrl = adjustUrlForWebKit(newUrl);
final int status = extractStatus(c);
final String contentType = c.getContentType();
final String contentEncoding = extractContentEncoding(c);
final long contentLength = extractContentLength(c);
final String responseHeaders = extractHeaders(c);
final String adjustedUrl = adjustUrlForWebKit(url);
final CountDownLatch latch =
asynchronous ? new CountDownLatch(1) : null;
callBack(() -> {
try {
if (!canceled) {
boolean keepGoing = notifyWillSendRequest(
adjustedNewUrl,
newMethod,
status,
contentType,
contentEncoding,
contentLength,
responseHeaders,
adjustedUrl);
if (!keepGoing) {
fwkCancel();
}
}
} finally {
if (latch != null) {
latch.countDown();
}
}
});
if (latch != null) {
latch.await();
}
}
private boolean notifyWillSendRequest(String newUrl,
String newMethod,
int status,
String contentType,
String contentEncoding,
long contentLength,
String headers,
String url)
{
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format(
"newUrl: [%s], "
+ "newMethod: [%s], "
+ "status: [%d], "
+ "contentType: [%s], "
+ "contentEncoding: [%s], "
+ "contentLength: [%d], "
+ "url: [%s], "
+ "data: [0x%016X], "
+ "headers:%n%s",
newUrl,
newMethod,
status,
contentType,
contentEncoding,
contentLength,
url,
data,
Util.formatHeaders(headers)));
}
boolean result = twkWillSendRequest(
newUrl,
newMethod,
status,
contentType,
contentEncoding,
contentLength,
headers,
url,
data);
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format("result: [%s]", result));
}
return result;
}
private void didReceiveResponse(URLConnection c) {
final int status = extractStatus(c);
final String contentType = c.getContentType();
final String contentEncoding = extractContentEncoding(c);
final long contentLength = extractContentLength(c);
final String responseHeaders = extractHeaders(c);
final String adjustedUrl = adjustUrlForWebKit(url);
callBack(() -> {
if (!canceled) {
notifyDidReceiveResponse(
status,
contentType,
contentEncoding,
contentLength,
responseHeaders,
adjustedUrl);
}
});
}
private void notifyDidReceiveResponse(int status,
String contentType,
String contentEncoding,
long contentLength,
String headers,
String url)
{
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format(
"status: [%d], "
+ "contentType: [%s], "
+ "contentEncoding: [%s], "
+ "contentLength: [%d], "
+ "url: [%s], "
+ "data: [0x%016X], "
+ "headers:%n%s",
status,
contentType,
contentEncoding,
contentLength,
url,
data,
Util.formatHeaders(headers)));
}
twkDidReceiveResponse(
status,
contentType,
contentEncoding,
contentLength,
headers,
url,
data);
}
private void didReceiveData(final ByteBuffer byteBuffer,
final ByteBufferAllocator allocator)
{
callBack(() -> {
if (!canceled) {
notifyDidReceiveData(
byteBuffer,
byteBuffer.position(),
byteBuffer.remaining());
}
byteBuffer.clear();
allocator.release(byteBuffer);
});
}
private void notifyDidReceiveData(ByteBuffer byteBuffer,
int position,
int remaining)
{
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format(
"byteBuffer: [%s], "
+ "position: [%s], "
+ "remaining: [%s], "
+ "data: [0x%016X]",
byteBuffer,
position,
remaining,
data));
}
twkDidReceiveData(byteBuffer, position, remaining, data);
}
private void didFinishLoading() {
callBack(() -> {
if (!canceled) {
notifyDidFinishLoading();
}
});
}
private void notifyDidFinishLoading() {
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format("data: [0x%016X]", data));
}
twkDidFinishLoading(data);
}
private void didFail(final int errorCode, final String message) {
final String adjustedUrl = adjustUrlForWebKit(url);
callBack(() -> {
if (!canceled) {
notifyDidFail(errorCode, adjustedUrl, message);
}
});
}
private void notifyDidFail(int errorCode, String url, String message) {
if (logger.isLoggable(Level.FINEST)) {
logger.finest(String.format(
"errorCode: [%d], "
+ "url: [%s], "
+ "message: [%s], "
+ "data: [0x%016X]",
errorCode,
url,
message,
data));
}
twkDidFail(errorCode, url, message, data);
}
private void callBack(Runnable runnable) {
if (asynchronous) {
Invoker.getInvoker().invokeOnEventThread(runnable);
} else {
runnable.run();
}
}
private static native void twkDidSendData(long totalBytesSent,
long totalBytesToBeSent,
long data);
private static native boolean twkWillSendRequest(String newUrl,
String newMethod,
int status,
String contentType,
String contentEncoding,
long contentLength,
String headers,
String url,
long data);
private static native void twkDidReceiveResponse(int status,
String contentType,
String contentEncoding,
long contentLength,
String headers,
String url,
long data);
private static native void twkDidReceiveData(ByteBuffer byteBuffer,
int position,
int remaining,
long data);
private static native void twkDidFinishLoading(long data);
private static native void twkDidFail(int errorCode,
String url,
String message,
long data);
/**
* Given a {@link URLConnection}, returns the connection status
* for passing into native callbacks.
*/
private static int extractStatus(URLConnection c) {
int status = 0;
if (c instanceof HttpURLConnection) {
try {
status = ((HttpURLConnection) c).getResponseCode();
} catch (java.io.IOException ignore) {}
}
return status;
}
/**
* Given a {@link URLConnection}, returns the content encoding
* for passing into native callbacks.
*/
private static String extractContentEncoding(URLConnection c) {
String contentEncoding = c.getContentEncoding();
// For compressed streams, the encoding is in Content-Type
if ("gzip".equalsIgnoreCase(contentEncoding) ||
"deflate".equalsIgnoreCase(contentEncoding))
{
contentEncoding = null;
String contentType = c.getContentType();
if (contentType != null) {
int i = contentType.indexOf("charset=");
if (i >= 0) {
contentEncoding = contentType.substring(i + 8);
i = contentEncoding.indexOf(";");
if (i > 0) {
contentEncoding = contentEncoding.substring(0, i);
}
}
}
}
return contentEncoding;
}
/**
* Given a {@link URLConnection}, returns the content length
* for passing into native callbacks.
*/
private static long extractContentLength(URLConnection c) {
// Cannot use URLConnection.getContentLength()
// as it only returns an int
try {
return Long.parseLong(c.getHeaderField("content-length"));
} catch (Exception ex) {
return -1;
}
}
/**
* Given a {@link URLConnection}, returns the headers string
* for passing into native callbacks.
*/
private static String extractHeaders(URLConnection c) {
StringBuilder sb = new StringBuilder();
Map> headers = c.getHeaderFields();
for (Map.Entry> entry: headers.entrySet()) {
String key = entry.getKey();
List values = entry.getValue();
for (String value : values) {
sb.append(key != null ? key : "");
sb.append(':').append(value).append('\n');
}
}
return sb.toString();
}
/**
* Adjust a URL string for passing into WebKit.
*/
private static String adjustUrlForWebKit(String url) {
try {
url = Util.adjustUrlForWebKit(url);
} catch (Exception ignore) {
}
return url;
}
}
