Custom JavaFX WebView Protocol Handler - webview

I am trying to write my own protocol handler for a JavaFX application that uses webview to access a single website. What I have done so far
My custom URLStreamHandlerFactory
public class MyURLStreamHandlerFactory implements URLStreamHandlerFactory {
public URLStreamHandler createURLStreamHandler(String protocol) {
System.out.println("Protocol: " + protocol);
if (protocol.equalsIgnoreCase("http") || protocol.equalsIgnoreCase("https")) {
return new MyURLStreamHandler();
} else {
return new URLStreamHandler() {
#Override
protected URLConnection openConnection(URL u) throws IOException {
return new URLConnection(u) {
#Override
public void connect() throws IOException {
}
};
}
};
}
}
}
My custom URLStreamHandler
public class MyURLStreamHandler extends java.net.URLStreamHandler{
protected HttpURLConnection openConnection(URL u){
MyURLConnection q = new MyURLConnection(u);
return q;
}
}
My custom HttpURLConnection
public class MyURLConnection extends HttpURLConnection {
static int defaultPort = 443;
InputStream in;
OutputStream out;
Socket s;
publicMyURLConnection(URL url) {
super(url);
try {
setRequestMethod("POST");
} catch (ProtocolException ex) {
ex.printStackTrace();
}
}
public void setRequestProperty(String name, String value){
super.setRequestProperty(name, value);
System.out.println("Namee: " + name);
System.out.println("Value: " + value);
}
public String getRequestProperty(String name){
System.out.println("GET REQUEST: ");
return super.getRequestProperty(name);
}
public OutputStream getOutputStream() throws IOException {
OutputStream os = super.getOutputStream();
System.out.println("Output: " + os);
return os;
}
public InputStream getInputStream() throws IOException {
InputStream is = super.getInputStream();
System.out.println("INout stream: " + is);
return is;
}
#Override
public void connect() throws IOException {
}
#Override
public void disconnect() {
throw new UnsupportedOperationException("Not supported yet.");
}
#Override
public boolean usingProxy() {
throw new UnsupportedOperationException("Not supported yet.");
}
When I run the application I get the following error althouhg it seems to set some headers
Jul 08, 2013 11:09:04 AM com.sun.webpane.webkit.network.URLLoader doRun
WARNING: Unexpected error
java.net.UnknownServiceException: protocol doesn't support input
at java.net.URLConnection.getInputStream(URLConnection.java:839)
at qmed.QMedURLConnection.getInputStream(MyURLConnection.java:67)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
at com.sun.webpane.webkit.network.URLLoader.receiveResponse(URLLoader.java:383)
at com.sun.webpane.webkit.network.URLLoader.doRun(URLLoader.java:142)
at com.sun.webpane.webkit.network.URLLoader.access$000(URLLoader.java:44)
at com.sun.webpane.webkit.network.URLLoader$1.run(URLLoader.java:106)
at com.sun.webpane.webkit.network.URLLoader$1.run(URLLoader.java:103)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.webpane.webkit.network.URLLoader.run(URLLoader.java:103)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
All I want to do is get the response back for a given request and reads its binary data. I want the protocol to behave exactly the same way as the default one and only check the binary data of a given respone. What am I doing wrong?
The application is doing all shorts of URLConnections. Is it correct to use a HTTPURLConnection as my custom URLConnection class when the protocol is http or https and start a default URLStreamHandler when other protocols are used like I am doing in MyURLStreamHandlerFactory? Should I just extend the default URLConnection class in MYURLConnection to handle all protocols the same?
Any help would be much appreciated as this is a project threatening problem
Thank you

It might be that all you are missing is a setDoInput(true) or override getDoInput() and return true (that's what i did).
If that does not help check out my working solution:
MyURLStreamHandlerFactory:
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
public class MyURLStreamHandlerFactory implements URLStreamHandlerFactory
{
public URLStreamHandler createURLStreamHandler(String protocol)
{
if (protocol.equals("myapp"))
{
return new MyURLHandler();
}
return null;
}
}
Register Factory:
URL.setURLStreamHandlerFactory(new MyURLStreamHandlerFactory());
MyURLHandler :
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
public class MyURLHandler extends URLStreamHandler
{
#Override
protected URLConnection openConnection(URL url) throws IOException
{
return new MyURLConnection(url);
}
}
MyURLConnection:
import java.io.*;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
/**
* Register a protocol handler for URLs like this: <code>myapp:///pics/sland.gif</code><br>
*/
public class MyURLConnection extends URLConnection
{
private byte[] data;
#Override
public void connect() throws IOException
{
if (connected)
{
return;
}
loadImage();
connected = true;
}
public String getHeaderField(String name)
{
if ("Content-Type".equalsIgnoreCase(name))
{
return getContentType();
}
else if ("Content-Length".equalsIgnoreCase(name))
{
return "" + getContentLength();
}
return null;
}
public String getContentType()
{
String fileName = getURL().getFile();
String ext = fileName.substring(fileName.lastIndexOf('.'));
return "image/" + ext; // TODO: switch based on file-type
}
public int getContentLength()
{
return data.length;
}
public long getContentLengthLong()
{
return data.length;
}
public boolean getDoInput()
{
return true;
}
public InputStream getInputStream() throws IOException
{
connect();
return new ByteArrayInputStream(data);
}
private void loadImage() throws IOException
{
if (data != null)
{
return;
}
try
{
int timeout = this.getConnectTimeout();
long start = System.currentTimeMillis();
URL url = getURL();
String imgPath = url.toExternalForm();
imgPath = imgPath.startsWith("myapp://") ? imgPath.substring("myapp://".length()) : imgPath.substring("myapp:".length()); // attention: triple '/' is reduced to a single '/'
// this is my own asynchronous image implementation
// instead of this part (including the following loop) you could do your own (synchronous) loading logic
MyImage img = MyApp.getImage(imgPath);
do
{
if (img.isFailed())
{
throw new IOException("Could not load image: " + getURL());
}
else if (!img.hasData())
{
long now = System.currentTimeMillis();
if (now - start > timeout)
{
throw new SocketTimeoutException();
}
Thread.sleep(100);
}
} while (!img.hasData());
data = img.getData();
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
public OutputStream getOutputStream() throws IOException
{
// this might be unnecessary - the whole method can probably be omitted for our purposes
return new ByteArrayOutputStream();
}
public java.security.Permission getPermission() throws IOException
{
return null; // we need no permissions to access this URL
}
}
Some parts of MyURLConnection might not be necessary for it to work, but like this it works for me.
Usage in JavaFX WebView:
<img src="myapp:///pics/image.png"/>
Note about permissions:
I used an applet with AllPermissions for my test with the above code.
In a Sandbox-Applet this won't work, as the setFactory permission is missing.

This is not directly related to the question asked, but might make the question itself obsolete.
With Java SE 6 Update 10 Java Applets support to access resources on any domain and port which is correctly set up with a crossdomain.xml.
With this the reason to register your own protocol might become obsolete, as you can access all resources that you need.
Another idea is: If you are trying to create a kind of network sniffer, why not directly use a network sniffer/analyzer program designed for such a task?

By activating Logging and Tracing in the Java Control-Panel your Java-Console will print all attempts and executed network calls including those from the WebView.
You can see all HTTP & HTTPS calls and their return-code + cookie data.
You might also see other protocol connections, but probably not any data sent over them.
This applies to Applets in a Browser.
If you need this in a different context maybe there is a way to activate the same options by passing command line parameters.

Related

How to add Channel Handler to TCPServer on Channel initialization

I have the following code snipped that creates a TCPServer, and attaches a ChannelHandler to the channel in the doOnChannelInit() function. The server is to process byte data from an embedded device.
#Component
#RequiredArgsConstructor
public class NettyServer {
Logger log = LoggerFactory.getLogger(NettyServer.class);
private final NettyProperties nettyProperties;
private final NettyServerHandler nettyServerHandler;
private TcpServer server;
public void run() {
server = TcpServer
.create()
.host("localhost")
.port(nettyProperties.getTcpPort())
.doOnChannelInit((connectionObserver, channel, remoteAddress) -> {
log.info("Connection from " + remoteAddress);
channel.pipeline()
.addLast("idleStateHandler", new IdleStateHandler(0, 0, 4, TimeUnit.MINUTES))
.addLast(new ByteArrayDecoder())
.addLast(new ByteArrayEncoder())
.addLast(nettyServerHandler);
});
server.bindNow();
log.info("Server running");
}
}
Channel handler
#Component
#RequiredArgsConstructor
#ChannelHandler.Sharable
public class NettyServerHandler extends SimpleChannelInboundHandler<byte[]> {
Logger log = LoggerFactory.getLogger(NettyServerHandler.class);
private final AttributeKey<byte[]> dataKey = AttributeKey.valueOf("dataBuf");
private final AttributeKey<Integer> dataLen = AttributeKey.valueOf("dataBufLen");
#Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
log.info("New Meter connection from : " + ctx.channel());
}
#Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
if (ctx.channel() != null) {
log.info(String.format("Meter/Client Disconnected. No: %s ; Channel : %s", meterNo, ctx.channel()));
}
ctx.close();
}
#Override
protected void channelRead0(ChannelHandlerContext ctx, byte[] msg) throws Exception {
log.info("Message received: " + new String(msg);
ctx.channel().read();
}
}
I'm able to connect to the server, but when i send a message, nothing happens, the log statements are not triggered.
I'm not sure what I'm missing here, would appreciate some help.
Thanks
There is no need to add custom handlers to the Netty pipeline. The example above can be written like this:
#Component
#RequiredArgsConstructor
public class NettyServer {
Logger log = LoggerFactory.getLogger(NettyServer.class);
private final NettyProperties nettyProperties;
private TcpServer server;
public void run() {
server = TcpServer
.create()
.host("localhost")
.port(nettyProperties.getTcpPort())
.doOnChannelInit((connectionObserver, channel, remoteAddress) -> {
log.info("Connection from " + remoteAddress);
channel.pipeline()
.addLast("idleStateHandler", new IdleStateHandler(0, 0, 4, TimeUnit.MINUTES));
})
.handle((in, out) ->
in.receive()
.asString()
.doOnNext(s -> log.info("Message received: " + s))
.then());
server.bindNow();
log.info("Server running");
}
}
Consider checking the Reference Documentation
The incoming data can be transformed to String with (asString), to byte[] with (asByteArray) etc. If there is no suitable transformation you can use map(byteBuf -> ...) and transform the ByteBuf to the needed abstraction.

OAuth2Authentication object deserialization (RedisTokenStore)

I'm trying to rewrite some legacy code which used org.springframework.security.oauth2.provider.token.store.InMemoryTokenStore to store the access tokens. I'm currently trying to use the RedisTokenStore instead of the previously used InMemoryTokenStore. The token gets generated and gets stored in Redis fine (Standalone redis configuration), however, deserialization of OAuth2Authentication fails with the following error:
Could not read JSON: Cannot construct instance of `org.springframework.security.oauth2.provider.OAuth2Authentication` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
Since there's no default constructor for this class, the deserialization and mapping to the actual object while looking up from Redis fails.
RedisTokenStore redisTokenStore = new RedisTokenStore(jedisConnectionFactory);
redisTokenStore.setSerializationStrategy(new StandardStringSerializationStrategy() {
#Override
protected <T> T deserializeInternal(byte[] bytes, Class<T> aClass) {
return Utilities.parse(new String(bytes, StandardCharsets.UTF_8),aClass);
}
#Override
protected byte[] serializeInternal(Object o) {
return Objects.requireNonNull(Utilities.convert(o)).getBytes();
}
});
this.tokenStore = redisTokenStore;
public static <T> T parse(String json, Class<T> clazz) {
try {
return OBJECT_MAPPER.readValue(json, clazz);
} catch (IOException e) {
log.error("Jackson2Json failed: " + e.getMessage());
} return null;}
public static String convert(Object data) {
try {
return OBJECT_MAPPER.writeValueAsString(data);
} catch (JsonProcessingException e) {
log.error("Conversion failed: " + e.getMessage());
}
return null;
}
How is OAuth2Authentication object reconstructed when the token is looked up from Redis? Since it does not define a default constructor, any Jackson based serializer and object mapper won't be able to deserialize it.
Again, the serialization works great (since OAuth2Authentication implements Serializable interface) and the token gets stored fine in Redis. It just fails when the /oauth/check_token is called.
What am I missing and how is this problem dealt with while storing access token in Redis?
I solved the issue by writing custom deserializer. It looks like this:
import com.fasterxml.jackson.core.JacksonException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import org.springframework.security.oauth2.core.AuthorizationGrantType;
import java.io.IOException;
public class AuthorizationGrantTypeCustomDeserializer extends JsonDeserializer<AuthorizationGrantType> {
#Override
public AuthorizationGrantType deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JacksonException {
Root root = p.readValueAs(Root.class);
return root != null ? new AuthorizationGrantType(root.value) : new AuthorizationGrantType("");
}
private static class Root {
public String value;
}
public static SimpleModule generateModule() {
SimpleModule authGrantModule = new SimpleModule();
authGrantModule.addDeserializer(AuthorizationGrantType.class, new AuthorizationGrantTypeCustomDeserializer());
return authGrantModule;
}
}
Then I registered deserializer in objectMapper which is later used by jackson API
ObjectMapper mapper = new ObjectMapper()
.registerModule(AuthorizationGrantTypeCustomDeserializer.generateModule());

How do I connect to a UNIX domain socket running an HTTP server using Netty?

I am trying to connect to a Docker UNIX domain socket using Netty. Here's my attempt so far.
#PostConstruct
public void init() throws Exception {
io.netty.bootstrap.Bootstrap bootstrap = new io.netty.bootstrap.Bootstrap();
bootstrap
.group(new NioEventLoopGroup())
.channel(NioSocketChannel.class)
.option(ChannelOption.SO_KEEPALIVE, true)
.remoteAddress(new DomainSocketAddress("/var/run/docker.sock"))
.handler(new ChannelInitializer<SocketChannel>() {
#Override
protected void initChannel(SocketChannel socketChannel) throws Exception {
socketChannel
.pipeline()
.addLast(new SimpleChannelInboundHandler<HttpObject>() {
#Override
protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject httpObject) throws Exception {
System.out.println(httpObject);
}
});
}
});
final Channel channel = bootstrap.connect().sync().channel();
final FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, "/services", Unpooled.EMPTY_BUFFER);
request.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.CLOSE);
channel.writeAndFlush(request);
channel.closeFuture().sync();
System.out.println("DONE");
}
At the moment I am getting
Caused by: java.nio.channels.UnsupportedAddressTypeException: null
Is there an example on how to do HTTP connections to UDS using Netty? So far I only found raw UDS and TCP HTTP but not combined.
Here's a working implementation.
io.netty.bootstrap.Bootstrap bootstrap = new io.netty.bootstrap.Bootstrap();
final EpollEventLoopGroup epollEventLoopGroup = new EpollEventLoopGroup();
try {
bootstrap
.group(epollEventLoopGroup)
.channel(EpollDomainSocketChannel.class)
.handler(new ChannelInitializer<UnixChannel>() {
#Override
public void initChannel(UnixChannel ch) throws Exception {
ch
.pipeline()
.addLast(new HttpClientCodec())
.addLast(new HttpContentDecompressor())
.addLast(new SimpleChannelInboundHandler<HttpObject>() {
private StringBuilder messageBuilder = new StringBuilder();
#Override
public void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
if (msg instanceof HttpContent) {
HttpContent content = (HttpContent) msg;
messageBuilder.append(content.content().toString(StandardCharsets.UTF_8));
if (msg instanceof LastHttpContent) {
System.out.println(messageBuilder);
}
} else {
System.out.println(msg.getClass());
}
}
});
}
});
final Channel channel = bootstrap.connect(new DomainSocketAddress("/var/run/docker.sock")).sync().channel();
final FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, "/services", Unpooled.EMPTY_BUFFER);
request.headers().set(HttpHeaderNames.HOST, "daemon");
channel.writeAndFlush(request);
channel.closeFuture().sync();
} finally {
epollEventLoopGroup.shutdownGracefully();
}
Few things to note:
Use the EpollEventLoopGroup and EpollDomainSocketChannel with a ChannelInitializer<UnixChannel>.
HTTP requires new HttpCodec() in the pipeline to use the Netty HTTP objects.
The data may be chunked so you need to assemble it and wait for the LastHttpContent object
https://github.com/trajano/netty-docker-daemon-socket

Tried to read incoming SMS content but getting Error in Blackberry

Hi friends i am trying to read incoming sms but getting warning like this . Invocation of questionable method: java.lang.String.(String) found in: mypackage.MyApp$ListeningThread.run()
Here is my code is
public class MyApp extends UiApplication {
//private ListeningThread listener;
public static void main(String[] args) {
MyApp theApp = new MyApp();
theApp.enterEventDispatcher();
}
public MyApp() {
invokeAndWait(new Runnable() {
public void run() {
ListeningThread listener = new ListeningThread();
listener.start();
}
});
pushScreen(new MyScreen());
}
private static class ListeningThread extends Thread {
private boolean _stop = false;
private DatagramConnection _dc;
public synchronized void stop() {
_stop = true;
try {
_dc.close(); // Close the connection so the thread returns.
} catch (IOException e) {
System.err.println(e.toString());
}
}
public void run() {
try {
_dc = (DatagramConnection) Connector.open("sms://");
for (;;) {
if (_stop) {
return;
}
Datagram d = _dc.newDatagram(_dc.getMaximumLength());
_dc.receive(d);
String address = new String(d.getAddress());
String msg = new String(d.getData());
if(msg.startsWith("START")){
Dialog.alert("hello");
}
System.out.println("Message received: " + msg);
System.out.println("From: " + address);
System.exit(0);
}
} catch (IOException e) {
System.err.println(e.toString());
}
}
}
}
Please correct me where i am wrong.Is possible give me some code to read incoming sms content in blackberry.
A few points about your code:
That invokeAndWait call to launch a thread makes no sense. It doesn't harm, but is kind of waste. Use that method only to perform UI related operations.
You should try using "sms://:0" as param for Connector.open. According to the docs, a parameter with the form {protocol}://[{host}]:[{port}] will open the connection in client mode (which makes sense, since you are on the receiving part), whereas not including the host part will open it in server mode.
Finally, if you can't get it working, you could use instead the third method specified in this tutorial, which you probably have already read.
The error you quoted is complaining about the use of the String constructor that takes a string argument. Since strings are immutable in Java-ME, this is just a waste. You can use the argument string directly:
Invocation of questionable method: java.lang.String.(String) found in: mypackage.MyApp$ListeningThread.run()
//String address = new String(d.getAddress());
String address = d.getAddress();
// getData() returns a byte[], so this is a different constructor
// However, this leaves the character encoding unspecified, so it
// will default to cp1252, which may not be what you want
String msg = new String(d.getData());

Blackberry Java - Fixed length streaming a POST body over a HTTP connect

I'm working on some code which POSTs large packets often over HTTP to a REST server on IIS. I'm using the RIM/JavaME HTTPConnection class.
As far as I can tell HTTPConnection uses an internal buffer to "gather" up the output stream before sending the entire contents to the server. I'm not surprised, since this is how HttpURLConnect works by default as well. (I assume it does this so that the content-length is set correctly.) But in JavaSE I could override this behavior by using the method setFixedLengthStreamingMode so that when I call flush on the output stream it would send that "chunk" of the stream. On a phone this extra buffering is too expensive in terms of memory.
In Blackberry Java is there a way to do fixed-length streaming on a HTTP request, when you know the content-length in advance?
So, I never found a way to do this was the base API for HTTPConnection. So instead, I created a socket and wrapped it with my own simple HTTPClient, which did support chunking.
Below is the prototype I used and tested on BB7.0.
package mypackage;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import javax.microedition.io.Connector;
import javax.microedition.io.SocketConnection;
public class MySimpleHTTPClient{
SocketConnection sc;
String HttpHeader;
OutputStreamWriter outWriter;
InputStreamReader inReader;
public void init(
String Host,
String port,
String path,
int ContentLength,
String ContentType ) throws IllegalArgumentException, IOException
{
String _host = (new StringBuffer())
.append("socket://")
.append(Host)
.append(":")
.append(port).toString();
sc = (SocketConnection)Connector.open(_host );
sc.setSocketOption(SocketConnection.LINGER, 5);
StringBuffer _header = new StringBuffer();
//Setup the HTTP Header.
_header.append("POST ").append(path).append(" HTTP/1.1\r\n");
_header.append("Host: ").append(Host).append("\r\n");
_header.append("Content-Length: ").append(ContentLength).append("\r\n");
_header.append("Content-Type: ").append(ContentType).append("\r\n");
_header.append("Connection: Close\r\n\r\n");
HttpHeader = _header.toString();
}
public void openOutputStream() throws IOException{
if(outWriter != null)
return;
outWriter = new OutputStreamWriter(sc.openOutputStream());
outWriter.write( HttpHeader, 0 , HttpHeader.length() );
}
public void openInputStream() throws IOException{
if(inReader != null)
return;
inReader = new InputStreamReader(sc.openDataInputStream());
}
public void writeChunkToServer(String Chunk) throws Exception{
if(outWriter == null){
try {
openOutputStream();
} catch (IOException e) {e.printStackTrace();}
}
outWriter.write(Chunk, 0, Chunk.length());
}
public String readFromServer() throws IOException {
if(inReader == null){
try {
openInputStream();
} catch (IOException e) {e.printStackTrace();}
}
StringBuffer sb = new StringBuffer();
int data = inReader.read();
//Note :: This will also read the HTTP headers..
// If you need to parse the headers, tokenize on \r\n for each
// header, the header section is done when you see \r\n\r\n
while(data != -1){
sb.append( (char)data );
data = inReader.read();
}
return sb.toString();
}
public void close(){
if(outWriter != null){
try {
outWriter.close();
} catch (IOException e) {}
}
if(inReader != null){
try {
inReader.close();
} catch (IOException e) {}
}
if(sc != null){
try {
sc.close();
} catch (IOException e) {}
}
}
}
Here is example usage for it:
MySimpleHTTPClient myConn = new MySimpleHTTPClient() ;
String chunk1 = "ID=foo&data1=1234567890&chunk1=0|";
String chunk2 = "ID=foo2&data2=123444344&chunk1=1";
try {
myConn.init(
"pdxsniffe02.webtrends.corp",
"80",
"TableAdd/234234234443?debug=1",
chunk1.length() + chunk2.length(),
"application/x-www-form-urlencoded"
);
myConn.writeChunkToServer(chunk1);
//The frist chunk is already on it's way.
myConn.writeChunkToServer(chunk2);
System.out.println( myConn.readFromServer() );
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}finally{
myConn.close();
}

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