src/main/scala/li/cil/oc/server/component/InternetCard.scala - minecraft/opencomputers - Rivoreo Source Code Repositories

 package li.cil.oc.server.component

 import java.io.BufferedWriter
 import java.io.FileNotFoundException
 import java.io.IOException
 import java.io.InputStream
 import java.io.OutputStreamWriter
 import java.net._
 import java.nio.ByteBuffer
 import java.nio.channels.SelectionKey
 import java.nio.channels.Selector
 import java.nio.channels.SocketChannel
 import java.util
 import java.util.UUID
 import java.util.concurrent._

 import li.cil.oc.Constants
 import li.cil.oc.OpenComputers
 import li.cil.oc.Settings
 import li.cil.oc.api.Network
 import li.cil.oc.api.driver.DeviceInfo
 import li.cil.oc.api.driver.DeviceInfo.DeviceAttribute
 import li.cil.oc.api.driver.DeviceInfo.DeviceClass
 import li.cil.oc.api.machine.Arguments
 import li.cil.oc.api.machine.Callback
 import li.cil.oc.api.machine.Context
 import li.cil.oc.api.network._
 import li.cil.oc.api.prefab
 import li.cil.oc.api.prefab.AbstractValue
 import li.cil.oc.util.ThreadPoolFactory
 import net.minecraft.server.MinecraftServer

 import scala.collection.convert.WrapAsJava._
 import scala.collection.convert.WrapAsScala._
 import scala.collection.mutable

 class InternetCard extends prefab.ManagedEnvironment with DeviceInfo {
   override val node = Network.newNode(this, Visibility.Network).
     withComponent("internet", Visibility.Neighbors).
     create()

   protected var owner: Option[Context] = None

   protected val connections = mutable.Set.empty[InternetCard.Closable]

   // ----------------------------------------------------------------------- //

   private final lazy val deviceInfo = Map(
     DeviceAttribute.Class -> DeviceClass.Communication,
     DeviceAttribute.Description -> "Internet modem",
     DeviceAttribute.Vendor -> Constants.DeviceInfo.DefaultVendor,
     DeviceAttribute.Product -> "SuperLink X-D4NK"
   )

   override def getDeviceInfo: util.Map[String, String] = deviceInfo

   // ----------------------------------------------------------------------- //

   @Callback(direct = true, doc = """function():boolean -- Returns whether HTTP requests can be made (config setting).""")
   def isHttpEnabled(context: Context, args: Arguments): Array[AnyRef] = result(Settings.get.httpEnabled)

   @Callback(doc = """function(url:string[, postData:string[, headers:table]]):userdata -- Starts an HTTP request. If this returns true, further results will be pushed using `http_response` signals.""")
   def request(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
     checkOwner(context)
     val address = args.checkString(0)
     if (!Settings.get.httpEnabled) {
       return result(Unit, "http requests are unavailable")
     }
     if (connections.size >= Settings.get.maxConnections) {
       throw new IOException("too many open connections")
     }
     val post = if (args.isString(1)) Option(args.checkString(1)) else None
     val headers = if (args.isTable(2)) args.checkTable(2).collect {
       case (key: String, value: AnyRef) => (key, value.toString)
     }.toMap
     else Map.empty[String, String]
     if (!Settings.get.httpHeadersEnabled && headers.nonEmpty) {
       return result(Unit, "http request headers are unavailable")
     }
     val request = new InternetCard.HTTPRequest(this, checkAddress(address), post, headers)
     connections += request
     result(request)
   }

   @Callback(direct = true, doc = """function():boolean -- Returns whether TCP connections can be made (config setting).""")
   def isTcpEnabled(context: Context, args: Arguments): Array[AnyRef] = result(Settings.get.tcpEnabled)

   @Callback(doc = """function(address:string[, port:number]):userdata -- Opens a new TCP connection. Returns the handle of the connection.""")
   def connect(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
     checkOwner(context)
     val address = args.checkString(0)
     val port = args.optInteger(1, -1)
     if (!Settings.get.tcpEnabled) {
       return result(Unit, "tcp connections are unavailable")
     }
     if (connections.size >= Settings.get.maxConnections) {
       throw new IOException("too many open connections")
     }
     val uri = checkUri(address, port)
     val socket = new InternetCard.TCPSocket(this, uri, port)
     connections += socket
     result(socket)
   }

   private def checkOwner(context: Context) {
     if (owner.isEmpty || context.node != owner.get.node) {
       throw new IllegalArgumentException("can only be used by the owning computer")
     }
   }

   // ----------------------------------------------------------------------- //

   override def onConnect(node: Node) {
     super.onConnect(node)
     if (owner.isEmpty && node.host.isInstanceOf[Context] && node.isNeighborOf(this.node)) {
       owner = Some(node.host.asInstanceOf[Context])
     }
   }

   override def onDisconnect(node: Node) = this.synchronized {
     super.onDisconnect(node)
     if (owner.isDefined && (node == this.node || node.host.isInstanceOf[Context] && (node.host.asInstanceOf[Context] == owner.get))) {
       owner = None
       this.synchronized {
         connections.foreach(_.close())
         connections.clear()
       }
     }
   }

   override def onMessage(message: Message) = this.synchronized {
     super.onMessage(message)
     message.data match {
       case Array() if (message.name == "computer.stopped" || message.name == "computer.started") && owner.isDefined && message.source.address == owner.get.node.address =>
         this.synchronized {
           connections.foreach(_.close())
           connections.clear()
         }
       case _ =>
     }
   }

   // ----------------------------------------------------------------------- //

   private def checkUri(address: String, port: Int): URI = {
     try {
       val parsed = new URI(address)
       if (parsed.getHost != null && (parsed.getPort > 0 || port > 0)) {
         return parsed
       }
     }
     catch {
       case _: Throwable =>
     }

     val simple = new URI("oc://" + address)
     if (simple.getHost != null) {
       if (simple.getPort > 0)
         return simple
       else if (port > 0)
         return new URI(simple.toString + ":" + port)
     }

     throw new IllegalArgumentException("address could not be parsed or no valid port given")
   }

   private def checkAddress(address: String) = {
     val url = try new URL(address)
     catch {
       case e: Throwable => throw new FileNotFoundException("invalid address")
     }
     val protocol = url.getProtocol
     if (!protocol.matches("^https?$")) {
       throw new FileNotFoundException("unsupported protocol")
     }
     url
   }
 }

 object InternetCard {
   private val threadPool = ThreadPoolFactory.create("Internet", Settings.get.internetThreads)

   trait Closable {
     def close(): Unit
   }

   object TCPNotifier extends Thread {
     private var selector = Selector.open()
     private val toAccept = new ConcurrentLinkedQueue[(SocketChannel, () => Unit)]

     override def run(): Unit = {
       while (true) {
         try {
           Stream.continually(toAccept.poll).takeWhile(_ != null).foreach({
             case (channel: SocketChannel, action: (() => Unit)) =>
               channel.register(selector, SelectionKey.OP_READ, action)
           })

           selector.select()

           import scala.collection.JavaConversions._
           val selectedKeys = selector.selectedKeys
           val readableKeys = mutable.HashSet[SelectionKey]()
           selectedKeys.filter(_.isReadable).foreach(key => {
             key.attachment.asInstanceOf[() => Unit].apply()
             readableKeys += key
           })

           if(readableKeys.nonEmpty) {
             val newSelector = Selector.open()
             selectedKeys.filter(!readableKeys.contains(_)).foreach(key => {
               key.channel.register(newSelector, SelectionKey.OP_READ, key.attachment)
             })
             selector.close()
             selector = newSelector
           }
         } catch {
           case e: IOException =>
             OpenComputers.log.error("Error in TCP selector loop.", e)
         }
       }
     }

     def add(e: (SocketChannel, () => Unit)) {
       toAccept.offer(e)
       selector.wakeup()
     }
   }

   TCPNotifier.start()

   class TCPSocket extends AbstractValue with Closable {
     def this(owner: InternetCard, uri: URI, port: Int) {
       this()
       this.owner = Some(owner)
       channel = SocketChannel.open()
       channel.configureBlocking(false)
       address = threadPool.submit(new AddressResolver(uri, port))
     }

     private var owner: Option[InternetCard] = None
     private var address: Future[InetAddress] = null
     private var channel: SocketChannel = null
     private var isAddressResolved = false
     private val id = UUID.randomUUID()

     private def setupSelector() {
       TCPNotifier.add((channel, () => {
         owner match {
           case Some(internetCard) =>
             internetCard.node.sendToVisible("computer.signal", "internet_ready", id.toString)
           case _ =>
             channel.close()
         }
       }))
     }

     @Callback(doc = """function():boolean -- Ensures a socket is connected. Errors if the connection failed.""")
     def finishConnect(context: Context, args: Arguments): Array[AnyRef] = {
       val r = this.synchronized(result(checkConnected()))
       setupSelector()
       r
     }

     @Callback(doc = """function([n:number]):string -- Tries to read data from the socket stream. Returns the read byte array.""")
     def read(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
       val n = math.min(Settings.get.maxReadBuffer, math.max(0, args.optInteger(0, Int.MaxValue)))
       if (checkConnected()) {
         val buffer = ByteBuffer.allocate(n)
         val read = channel.read(buffer)
         if (read == -1) result(Unit)
         else {
           setupSelector()
           result(buffer.array.view(0, read).toArray)
         }
       }
       else result(Array.empty[Byte])
     }

     @Callback(doc = """function(data:string):number -- Tries to write data to the socket stream. Returns the number of bytes written.""")
     def write(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
       if (checkConnected()) {
         val value = args.checkByteArray(0)
         result(channel.write(ByteBuffer.wrap(value)))
       }
       else result(0)
     }

     @Callback(direct = true, doc = """function() -- Closes an open socket stream.""")
     def close(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
       close()
       null
     }

     @Callback(direct = true, doc = """function():string -- Returns connection ID.""")
     def id(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
       result(id.toString)
     }

     override def dispose(context: Context): Unit = {
       super.dispose(context)
       close()
     }

     override def close(): Unit = {
       owner.foreach(card => {
         card.connections.remove(this)
         address.cancel(true)
         channel.close()
         owner = None
         address = null
         channel = null
       })
     }

     private def checkConnected() = {
       if (owner.isEmpty) throw new IOException("connection lost")
       try {
         if (isAddressResolved) channel.finishConnect()
         else if (address.isCancelled) {
           // I don't think this can ever happen, Justin Case.
           channel.close()
           throw new IOException("bad connection descriptor")
         }
         else if (address.isDone) {
           // Check for errors.
           try address.get catch {
             case e: ExecutionException => throw e.getCause
           }
           isAddressResolved = true
           false
         }
         else false
       }
       catch {
         case t: Throwable =>
           close()
           false
       }
     }

     // This has to be an explicit internal class instead of an anonymous one
     // because the scala compiler breaks otherwise. Yay for compiler bugs.
     private class AddressResolver(val uri: URI, val port: Int) extends Callable[InetAddress] {
       override def call(): InetAddress = {
         val resolved = InetAddress.getByName(uri.getHost)
         checkLists(resolved, uri.getHost)
         val address = new InetSocketAddress(resolved, if (uri.getPort != -1) uri.getPort else port)
         channel.connect(address)
         resolved
       }
     }

   }

   def checkLists(inetAddress: InetAddress, host: String) {
     if (Settings.get.httpHostWhitelist.length > 0 && !Settings.get.httpHostWhitelist.exists(_ (inetAddress, host))) {
       throw new FileNotFoundException("address is not whitelisted")
     }
     if (Settings.get.httpHostBlacklist.length > 0 && Settings.get.httpHostBlacklist.exists(_ (inetAddress, host))) {
       throw new FileNotFoundException("address is blacklisted")
     }
   }

   class HTTPRequest extends AbstractValue with Closable {
     def this(owner: InternetCard, url: URL, post: Option[String], headers: Map[String, String]) {
       this()
       this.owner = Some(owner)
       this.stream = threadPool.submit(new RequestSender(url, post, headers))
     }

     private var owner: Option[InternetCard] = None
     private var response: Option[(Int, String, AnyRef)] = None
     private var stream: Future[InputStream] = null
     private val queue = new ConcurrentLinkedQueue[Byte]()
     private var reader: Future[_] = null
     private var eof = false

     @Callback(doc = """function():boolean -- Ensures a response is available. Errors if the connection failed.""")
     def finishConnect(context: Context, args: Arguments): Array[AnyRef] = this.synchronized(result(checkResponse()))

     @Callback(direct = true, doc = """function():number, string, table -- Get response code, message and headers.""")
     def response(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
       response match {
         case Some((code, message, headers)) => result(code, message, headers)
         case _ => result(Unit)
       }
     }

     @Callback(doc = """function([n:number]):string -- Tries to read data from the response. Returns the read byte array.""")
     def read(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
       val n = math.min(Settings.get.maxReadBuffer, math.max(0, args.optInteger(0, Int.MaxValue)))
       if (checkResponse()) {
         if (eof && queue.isEmpty) result(Unit)
         else {
           val buffer = ByteBuffer.allocate(n)
           var read = 0
           while (!queue.isEmpty && read < n) {
             buffer.put(queue.poll())
             read += 1
           }
           if (read == 0) {
             readMore()
           }
           result(buffer.array.view(0, read).toArray)
         }
       }
       else result(Array.empty[Byte])
     }

     @Callback(direct = true, doc = """function() -- Closes an open socket stream.""")
     def close(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
       close()
       null
     }

     override def dispose(context: Context): Unit = {
       super.dispose(context)
       close()
     }

     override def close(): Unit = {
       owner.foreach(card => {
         card.connections.remove(this)
         stream.cancel(true)
         if (reader != null) {
           reader.cancel(true)
         }
         owner = None
         stream = null
         reader = null
       })
     }

     private def checkResponse() = this.synchronized {
       if (owner.isEmpty) throw new IOException("connection lost")
       if (stream.isDone) {
         if (reader == null) {
           // Check for errors.
           try stream.get catch {
             case e: ExecutionException => throw e.getCause
           }
           readMore()
         }
         true
       }
       else false
     }

     private def readMore(): Unit = {
       if (reader == null || reader.isCancelled || reader.isDone) {
         if (!eof) reader = threadPool.submit(new Runnable {
           override def run(): Unit = {
             val buffer = new Array[Byte](Settings.get.maxReadBuffer)
             val count = stream.get.read(buffer)
             if (count < 0) {
               eof = true
             }
             for (i <- 0 until count) {
               queue.add(buffer(i))
             }
           }
         })
       }
     }

     // This one doesn't (see comment in TCP socket), but I like to keep it consistent.
     private class RequestSender(val url: URL, val post: Option[String], val headers: Map[String, String]) extends Callable[InputStream] {
       override def call() = try {
         checkLists(InetAddress.getByName(url.getHost), url.getHost)
         val proxy = Option(MinecraftServer.getServer.getServerProxy).getOrElse(java.net.Proxy.NO_PROXY)
         url.openConnection(proxy) match {
           case http: HttpURLConnection => try {
             http.setDoInput(true)
             headers.foreach(Function.tupled(http.setRequestProperty))
             if (post.isDefined) {
               http.setRequestMethod("POST")
               http.setDoOutput(true)
               http.setReadTimeout(Settings.get.httpTimeout)

               val out = new BufferedWriter(new OutputStreamWriter(http.getOutputStream))
               out.write(post.get)
               out.close()
             }
             else {
               http.setRequestMethod("GET")
               http.setDoOutput(false)
             }

             val input = http.getInputStream
             HTTPRequest.this.synchronized {
               response = Some((http.getResponseCode, http.getResponseMessage, http.getHeaderFields))
             }
             input
           }
           catch {
             case t: Throwable =>
               http.disconnect()
               throw t
           }
           case other => throw new IOException("unexpected connection type")
         }
       }
       catch {
         case e: UnknownHostException =>
           throw new IOException("unknown host: " + Option(e.getMessage).getOrElse(e.toString))
         case e: Throwable =>
           throw new IOException(Option(e.getMessage).getOrElse(e.toString))
       }
     }

   }

 }
	package li.cil.oc.server.component

	import java.io.BufferedWriter
	import java.io.FileNotFoundException
	import java.io.IOException
	import java.io.InputStream
	import java.io.OutputStreamWriter
	import java.net._
	import java.nio.ByteBuffer
	import java.nio.channels.SelectionKey
	import java.nio.channels.Selector
	import java.nio.channels.SocketChannel
	import java.util
	import java.util.UUID
	import java.util.concurrent._

	import li.cil.oc.Constants
	import li.cil.oc.OpenComputers
	import li.cil.oc.Settings
	import li.cil.oc.api.Network
	import li.cil.oc.api.driver.DeviceInfo
	import li.cil.oc.api.driver.DeviceInfo.DeviceAttribute
	import li.cil.oc.api.driver.DeviceInfo.DeviceClass
	import li.cil.oc.api.machine.Arguments
	import li.cil.oc.api.machine.Callback
	import li.cil.oc.api.machine.Context
	import li.cil.oc.api.network._
	import li.cil.oc.api.prefab
	import li.cil.oc.api.prefab.AbstractValue
	import li.cil.oc.util.ThreadPoolFactory
	import net.minecraft.server.MinecraftServer

	import scala.collection.convert.WrapAsJava._
	import scala.collection.convert.WrapAsScala._
	import scala.collection.mutable

	class InternetCard extends prefab.ManagedEnvironment with DeviceInfo {
	override val node = Network.newNode(this, Visibility.Network).
	withComponent("internet", Visibility.Neighbors).
	create()

	protected var owner: Option[Context] = None

	protected val connections = mutable.Set.empty[InternetCard.Closable]

	// ----------------------------------------------------------------------- //

	private final lazy val deviceInfo = Map(
	DeviceAttribute.Class -> DeviceClass.Communication,
	DeviceAttribute.Description -> "Internet modem",
	DeviceAttribute.Vendor -> Constants.DeviceInfo.DefaultVendor,
	DeviceAttribute.Product -> "SuperLink X-D4NK"
	)

	override def getDeviceInfo: util.Map[String, String] = deviceInfo

	// ----------------------------------------------------------------------- //

	@Callback(direct = true, doc = """function():boolean -- Returns whether HTTP requests can be made (config setting).""")
	def isHttpEnabled(context: Context, args: Arguments): Array[AnyRef] = result(Settings.get.httpEnabled)

	@Callback(doc = """function(url:string[, postData:string[, headers:table]]):userdata -- Starts an HTTP request. If this returns true, further results will be pushed using `http_response` signals.""")
	def request(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	checkOwner(context)
	val address = args.checkString(0)
	if (!Settings.get.httpEnabled) {
	return result(Unit, "http requests are unavailable")
	}
	if (connections.size >= Settings.get.maxConnections) {
	throw new IOException("too many open connections")
	}
	val post = if (args.isString(1)) Option(args.checkString(1)) else None
	val headers = if (args.isTable(2)) args.checkTable(2).collect {
	case (key: String, value: AnyRef) => (key, value.toString)
	}.toMap
	else Map.empty[String, String]
	if (!Settings.get.httpHeadersEnabled && headers.nonEmpty) {
	return result(Unit, "http request headers are unavailable")
	}
	val request = new InternetCard.HTTPRequest(this, checkAddress(address), post, headers)
	connections += request
	result(request)
	}

	@Callback(direct = true, doc = """function():boolean -- Returns whether TCP connections can be made (config setting).""")
	def isTcpEnabled(context: Context, args: Arguments): Array[AnyRef] = result(Settings.get.tcpEnabled)

	@Callback(doc = """function(address:string[, port:number]):userdata -- Opens a new TCP connection. Returns the handle of the connection.""")
	def connect(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	checkOwner(context)
	val address = args.checkString(0)
	val port = args.optInteger(1, -1)
	if (!Settings.get.tcpEnabled) {
	return result(Unit, "tcp connections are unavailable")
	}
	if (connections.size >= Settings.get.maxConnections) {
	throw new IOException("too many open connections")
	}
	val uri = checkUri(address, port)
	val socket = new InternetCard.TCPSocket(this, uri, port)
	connections += socket
	result(socket)
	}

	private def checkOwner(context: Context) {
	if (owner.isEmpty \|\| context.node != owner.get.node) {
	throw new IllegalArgumentException("can only be used by the owning computer")
	}
	}

	// ----------------------------------------------------------------------- //

	override def onConnect(node: Node) {
	super.onConnect(node)
	if (owner.isEmpty && node.host.isInstanceOf[Context] && node.isNeighborOf(this.node)) {
	owner = Some(node.host.asInstanceOf[Context])
	}
	}

	override def onDisconnect(node: Node) = this.synchronized {
	super.onDisconnect(node)
	if (owner.isDefined && (node == this.node \|\| node.host.isInstanceOf[Context] && (node.host.asInstanceOf[Context] == owner.get))) {
	owner = None
	this.synchronized {
	connections.foreach(_.close())
	connections.clear()
	}
	}
	}

	override def onMessage(message: Message) = this.synchronized {
	super.onMessage(message)
	message.data match {
	case Array() if (message.name == "computer.stopped" \|\| message.name == "computer.started") && owner.isDefined && message.source.address == owner.get.node.address =>
	this.synchronized {
	connections.foreach(_.close())
	connections.clear()
	}
	case _ =>
	}
	}

	// ----------------------------------------------------------------------- //

	private def checkUri(address: String, port: Int): URI = {
	try {
	val parsed = new URI(address)
	if (parsed.getHost != null && (parsed.getPort > 0 \|\| port > 0)) {
	return parsed
	}
	}
	catch {
	case _: Throwable =>
	}

	val simple = new URI("oc://" + address)
	if (simple.getHost != null) {
	if (simple.getPort > 0)
	return simple
	else if (port > 0)
	return new URI(simple.toString + ":" + port)
	}

	throw new IllegalArgumentException("address could not be parsed or no valid port given")
	}

	private def checkAddress(address: String) = {
	val url = try new URL(address)
	catch {
	case e: Throwable => throw new FileNotFoundException("invalid address")
	}
	val protocol = url.getProtocol
	if (!protocol.matches("^https?$")) {
	throw new FileNotFoundException("unsupported protocol")
	}
	url
	}
	}

	object InternetCard {
	private val threadPool = ThreadPoolFactory.create("Internet", Settings.get.internetThreads)

	trait Closable {
	def close(): Unit
	}

	object TCPNotifier extends Thread {
	private var selector = Selector.open()
	private val toAccept = new ConcurrentLinkedQueue[(SocketChannel, () => Unit)]

	override def run(): Unit = {
	while (true) {
	try {
	Stream.continually(toAccept.poll).takeWhile(_ != null).foreach({
	case (channel: SocketChannel, action: (() => Unit)) =>
	channel.register(selector, SelectionKey.OP_READ, action)
	})

	selector.select()

	import scala.collection.JavaConversions._
	val selectedKeys = selector.selectedKeys
	val readableKeys = mutable.HashSet[SelectionKey]()
	selectedKeys.filter(_.isReadable).foreach(key => {
	key.attachment.asInstanceOf[() => Unit].apply()
	readableKeys += key
	})

	if(readableKeys.nonEmpty) {
	val newSelector = Selector.open()
	selectedKeys.filter(!readableKeys.contains(_)).foreach(key => {
	key.channel.register(newSelector, SelectionKey.OP_READ, key.attachment)
	})
	selector.close()
	selector = newSelector
	}
	} catch {
	case e: IOException =>
	OpenComputers.log.error("Error in TCP selector loop.", e)
	}
	}
	}

	def add(e: (SocketChannel, () => Unit)) {
	toAccept.offer(e)
	selector.wakeup()
	}
	}

	TCPNotifier.start()

	class TCPSocket extends AbstractValue with Closable {
	def this(owner: InternetCard, uri: URI, port: Int) {
	this()
	this.owner = Some(owner)
	channel = SocketChannel.open()
	channel.configureBlocking(false)
	address = threadPool.submit(new AddressResolver(uri, port))
	}

	private var owner: Option[InternetCard] = None
	private var address: Future[InetAddress] = null
	private var channel: SocketChannel = null
	private var isAddressResolved = false
	private val id = UUID.randomUUID()

	private def setupSelector() {
	TCPNotifier.add((channel, () => {
	owner match {
	case Some(internetCard) =>
	internetCard.node.sendToVisible("computer.signal", "internet_ready", id.toString)
	case _ =>
	channel.close()
	}
	}))
	}

	@Callback(doc = """function():boolean -- Ensures a socket is connected. Errors if the connection failed.""")
	def finishConnect(context: Context, args: Arguments): Array[AnyRef] = {
	val r = this.synchronized(result(checkConnected()))
	setupSelector()
	r
	}

	@Callback(doc = """function([n:number]):string -- Tries to read data from the socket stream. Returns the read byte array.""")
	def read(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	val n = math.min(Settings.get.maxReadBuffer, math.max(0, args.optInteger(0, Int.MaxValue)))
	if (checkConnected()) {
	val buffer = ByteBuffer.allocate(n)
	val read = channel.read(buffer)
	if (read == -1) result(Unit)
	else {
	setupSelector()
	result(buffer.array.view(0, read).toArray)
	}
	}
	else result(Array.empty[Byte])
	}

	@Callback(doc = """function(data:string):number -- Tries to write data to the socket stream. Returns the number of bytes written.""")
	def write(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	if (checkConnected()) {
	val value = args.checkByteArray(0)
	result(channel.write(ByteBuffer.wrap(value)))
	}
	else result(0)
	}

	@Callback(direct = true, doc = """function() -- Closes an open socket stream.""")
	def close(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	close()
	null
	}

	@Callback(direct = true, doc = """function():string -- Returns connection ID.""")
	def id(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	result(id.toString)
	}

	override def dispose(context: Context): Unit = {
	super.dispose(context)
	close()
	}

	override def close(): Unit = {
	owner.foreach(card => {
	card.connections.remove(this)
	address.cancel(true)
	channel.close()
	owner = None
	address = null
	channel = null
	})
	}

	private def checkConnected() = {
	if (owner.isEmpty) throw new IOException("connection lost")
	try {
	if (isAddressResolved) channel.finishConnect()
	else if (address.isCancelled) {
	// I don't think this can ever happen, Justin Case.
	channel.close()
	throw new IOException("bad connection descriptor")
	}
	else if (address.isDone) {
	// Check for errors.
	try address.get catch {
	case e: ExecutionException => throw e.getCause
	}
	isAddressResolved = true
	false
	}
	else false
	}
	catch {
	case t: Throwable =>
	close()
	false
	}
	}

	// This has to be an explicit internal class instead of an anonymous one
	// because the scala compiler breaks otherwise. Yay for compiler bugs.
	private class AddressResolver(val uri: URI, val port: Int) extends Callable[InetAddress] {
	override def call(): InetAddress = {
	val resolved = InetAddress.getByName(uri.getHost)
	checkLists(resolved, uri.getHost)
	val address = new InetSocketAddress(resolved, if (uri.getPort != -1) uri.getPort else port)
	channel.connect(address)
	resolved
	}
	}

	}

	def checkLists(inetAddress: InetAddress, host: String) {
	if (Settings.get.httpHostWhitelist.length > 0 && !Settings.get.httpHostWhitelist.exists(_ (inetAddress, host))) {
	throw new FileNotFoundException("address is not whitelisted")
	}
	if (Settings.get.httpHostBlacklist.length > 0 && Settings.get.httpHostBlacklist.exists(_ (inetAddress, host))) {
	throw new FileNotFoundException("address is blacklisted")
	}
	}

	class HTTPRequest extends AbstractValue with Closable {
	def this(owner: InternetCard, url: URL, post: Option[String], headers: Map[String, String]) {
	this()
	this.owner = Some(owner)
	this.stream = threadPool.submit(new RequestSender(url, post, headers))
	}

	private var owner: Option[InternetCard] = None
	private var response: Option[(Int, String, AnyRef)] = None
	private var stream: Future[InputStream] = null
	private val queue = new ConcurrentLinkedQueue[Byte]()
	private var reader: Future[_] = null
	private var eof = false

	@Callback(doc = """function():boolean -- Ensures a response is available. Errors if the connection failed.""")
	def finishConnect(context: Context, args: Arguments): Array[AnyRef] = this.synchronized(result(checkResponse()))

	@Callback(direct = true, doc = """function():number, string, table -- Get response code, message and headers.""")
	def response(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	response match {
	case Some((code, message, headers)) => result(code, message, headers)
	case _ => result(Unit)
	}
	}

	@Callback(doc = """function([n:number]):string -- Tries to read data from the response. Returns the read byte array.""")
	def read(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	val n = math.min(Settings.get.maxReadBuffer, math.max(0, args.optInteger(0, Int.MaxValue)))
	if (checkResponse()) {
	if (eof && queue.isEmpty) result(Unit)
	else {
	val buffer = ByteBuffer.allocate(n)
	var read = 0
	while (!queue.isEmpty && read < n) {
	buffer.put(queue.poll())
	read += 1
	}
	if (read == 0) {
	readMore()
	}
	result(buffer.array.view(0, read).toArray)
	}
	}
	else result(Array.empty[Byte])
	}

	@Callback(direct = true, doc = """function() -- Closes an open socket stream.""")
	def close(context: Context, args: Arguments): Array[AnyRef] = this.synchronized {
	close()
	null
	}

	override def dispose(context: Context): Unit = {
	super.dispose(context)
	close()
	}

	override def close(): Unit = {
	owner.foreach(card => {
	card.connections.remove(this)
	stream.cancel(true)
	if (reader != null) {
	reader.cancel(true)
	}
	owner = None
	stream = null
	reader = null
	})
	}

	private def checkResponse() = this.synchronized {
	if (owner.isEmpty) throw new IOException("connection lost")
	if (stream.isDone) {
	if (reader == null) {
	// Check for errors.
	try stream.get catch {
	case e: ExecutionException => throw e.getCause
	}
	readMore()
	}
	true
	}
	else false
	}

	private def readMore(): Unit = {
	if (reader == null \|\| reader.isCancelled \|\| reader.isDone) {
	if (!eof) reader = threadPool.submit(new Runnable {
	override def run(): Unit = {
	val buffer = new Array[Byte](Settings.get.maxReadBuffer)
	val count = stream.get.read(buffer)
	if (count < 0) {
	eof = true
	}
	for (i <- 0 until count) {
	queue.add(buffer(i))
	}
	}
	})
	}
	}

	// This one doesn't (see comment in TCP socket), but I like to keep it consistent.
	private class RequestSender(val url: URL, val post: Option[String], val headers: Map[String, String]) extends Callable[InputStream] {
	override def call() = try {
	checkLists(InetAddress.getByName(url.getHost), url.getHost)
	val proxy = Option(MinecraftServer.getServer.getServerProxy).getOrElse(java.net.Proxy.NO_PROXY)
	url.openConnection(proxy) match {
	case http: HttpURLConnection => try {
	http.setDoInput(true)
	headers.foreach(Function.tupled(http.setRequestProperty))
	if (post.isDefined) {
	http.setRequestMethod("POST")
	http.setDoOutput(true)
	http.setReadTimeout(Settings.get.httpTimeout)

	val out = new BufferedWriter(new OutputStreamWriter(http.getOutputStream))
	out.write(post.get)
	out.close()
	}
	else {
	http.setRequestMethod("GET")
	http.setDoOutput(false)
	}

	val input = http.getInputStream
	HTTPRequest.this.synchronized {
	response = Some((http.getResponseCode, http.getResponseMessage, http.getHeaderFields))
	}
	input
	}
	catch {
	case t: Throwable =>
	http.disconnect()
	throw t
	}
	case other => throw new IOException("unexpected connection type")
	}
	}
	catch {
	case e: UnknownHostException =>
	throw new IOException("unknown host: " + Option(e.getMessage).getOrElse(e.toString))
	case e: Throwable =>
	throw new IOException(Option(e.getMessage).getOrElse(e.toString))
	}
	}

	}

	}