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Merge pull request #179 from KyoriPowered/feat/ingame-motd
feat: add initial server list ping implementation
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@@ -5,3 +5,4 @@ | |
| /run/ | ||
| /*.iml | ||
| /kotlin-js-store/ | ||
| /.kotlin/ | ||
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218 changes: 218 additions & 0 deletions
218
...in/kotlin/net/kyori/adventure/webui/jvm/minimessage/preview/ServerStatusPreviewManager.kt
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| package net.kyori.adventure.webui.jvm.minimessage.preview | ||
|
|
||
| import io.github.reactivecircus.cache4k.Cache | ||
| import io.ktor.network.selector.SelectorManager | ||
| import io.ktor.network.sockets.aSocket | ||
| import io.ktor.network.sockets.openReadChannel | ||
| import io.ktor.network.sockets.openWriteChannel | ||
| import io.ktor.server.application.Application | ||
| import io.ktor.utils.io.ByteReadChannel | ||
| import io.ktor.utils.io.ByteWriteChannel | ||
| import io.ktor.utils.io.close | ||
| import io.ktor.utils.io.writeByte | ||
| import io.ktor.utils.io.writeFully | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.SupervisorJob | ||
| import kotlinx.coroutines.ensureActive | ||
| import kotlinx.coroutines.job | ||
| import kotlinx.coroutines.launch | ||
| import net.kyori.adventure.text.minimessage.MiniMessage | ||
| import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer | ||
| import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer | ||
| import okhttp3.internal.and | ||
| import org.slf4j.LoggerFactory | ||
| import java.io.ByteArrayOutputStream | ||
| import java.io.DataOutputStream | ||
| import kotlin.coroutines.CoroutineContext | ||
| import kotlin.time.Duration.Companion.hours | ||
|
|
||
| /** Manager class for previewing server status. */ | ||
| public class ServerStatusPreviewManager( | ||
| application: Application, | ||
| ) : CoroutineScope { | ||
|
|
||
| private val logger = LoggerFactory.getLogger(ServerStatusPreviewManager::class.java) | ||
| private val managerJob = SupervisorJob(application.coroutineContext.job) | ||
| override val coroutineContext: CoroutineContext = application.coroutineContext + managerJob | ||
|
|
||
| private val motdPreviews = Cache.Builder<String, String>().expireAfterAccess(1.hours).build() | ||
| private val kickPreviews = Cache.Builder<String, String>().expireAfterAccess(1.hours).build() | ||
|
|
||
| init { | ||
| launch { | ||
| // Initialise the socket. | ||
| val serverSocket = aSocket(SelectorManager(Dispatchers.IO)).tcp().bind("0.0.0.0", 25565) | ||
| logger.info("Listening for pings at ${serverSocket.localAddress}") | ||
|
|
||
| while (true) { | ||
| // Ensure we are active so that the socket is properly closed when the application ends. | ||
| ensureActive() | ||
|
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| val socket = serverSocket.accept() | ||
| logger.debug("Accepted socket connection from {}", socket.remoteAddress) | ||
|
|
||
| launch { | ||
| try { | ||
| val receiveChannel = socket.openReadChannel() | ||
| val sendChannel = socket.openWriteChannel(autoFlush = true) | ||
|
|
||
| // handshake | ||
| val handshakePacket = receiveChannel.readMcPacket() | ||
| val protocolVersion = handshakePacket.readVarInt() | ||
| val serverAddress = handshakePacket.readUtf8String() | ||
| val serverPort = handshakePacket.readShort() | ||
| val nextState = handshakePacket.readVarInt() | ||
|
|
||
| if (nextState != 1) { | ||
| // send kick | ||
| sendChannel.writeMcPacket(0) { | ||
| it.writeString( | ||
| GsonComponentSerializer.gson() | ||
| .serialize(MiniMessage.miniMessage().deserialize(lookupKickMessage(serverAddress))) | ||
| ) | ||
| } | ||
| } else { | ||
| // send status response | ||
| sendChannel.writeMcPacket(0) { | ||
| it.writeString( | ||
| """{ | ||
| "version": { | ||
| "name": "${ | ||
| LegacyComponentSerializer.legacySection() | ||
| .serialize(MiniMessage.miniMessage().deserialize("<rainbow>MiniMessage")) | ||
| }", | ||
| "protocol": 1 | ||
| }, | ||
| "players": { | ||
| "max": 0, | ||
| "online": 0 | ||
| }, | ||
| "description": ${ | ||
| GsonComponentSerializer.gson().serialize( | ||
| MiniMessage.miniMessage().deserialize(lookupMotd(serverAddress)) | ||
| ) | ||
| } | ||
| }""".trimIndent() | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| sendChannel.close() | ||
| } catch (e: Exception) { | ||
| logger.error("An unknown error occurred whilst responding to a ping from ${socket.remoteAddress}", e) | ||
| } | ||
|
|
||
| socket.close() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private fun lookupKickMessage(serverAddress: String): String { | ||
| return kickPreviews.get(serverAddress.split("\\.")[0]) ?: "<red>You cant join here!" | ||
| } | ||
|
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| private fun lookupMotd(serverAddress: String): String { | ||
| return motdPreviews.get(serverAddress.split("\\.")[0]) ?: "<rainbow>MiniMessage is cool!" | ||
| } | ||
|
|
||
| public fun initializeKickPreview(input: String): String { | ||
| val key = generateRandomString() | ||
| kickPreviews.put(key, input) | ||
| return "$key.webui.advntr.dev" | ||
| } | ||
|
|
||
| public fun initializeMotdPreview(input: String): String { | ||
| val key = generateRandomString() | ||
| motdPreviews.put(key, input) | ||
| return "$key.webui.advntr.dev" | ||
| } | ||
|
|
||
| private fun generateRandomString(length: Int = 8): String { | ||
| val allowedChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" | ||
| return (1..length) | ||
| .map { allowedChars.random() } | ||
| .joinToString("") | ||
| } | ||
|
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| private suspend fun ByteWriteChannel.writeMcPacket(packetId: Int, consumer: (packet: DataOutputStream) -> Unit) { | ||
| val stream = ByteArrayOutputStream() | ||
| val packet = DataOutputStream(stream) | ||
|
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| consumer.invoke(packet) | ||
|
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| val data = stream.toByteArray() | ||
| writeVarInt(data.size + 1) | ||
| writeVarInt(packetId) | ||
| writeFully(data) | ||
| } | ||
|
|
||
| private fun DataOutputStream.writeString(string: String) { | ||
| val bytes = string.toByteArray(Charsets.UTF_8) | ||
| writeVarInt(bytes.size) | ||
| write(bytes) | ||
| } | ||
|
|
||
| private fun DataOutputStream.writeVarInt(int: Int) { | ||
| var value = int | ||
| while (true) { | ||
| if ((value and 0x7F.inv()) == 0) { | ||
| writeByte(value) | ||
| return | ||
| } | ||
|
|
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| writeByte((value and 0x7F) or 0x80) | ||
|
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| value = value ushr 7 | ||
| } | ||
| } | ||
|
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||
| private suspend fun ByteWriteChannel.writeVarInt(int: Int) { | ||
| var value = int | ||
| while (true) { | ||
| if ((value and 0x7F.inv()) == 0) { | ||
| writeByte(value) | ||
| return | ||
| } | ||
|
|
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| writeByte((value and 0x7F) or 0x80) | ||
|
|
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| value = value ushr 7 | ||
| } | ||
| } | ||
|
|
||
| private suspend fun ByteReadChannel.readMcPacket(): ByteReadChannel { | ||
| val length = readVarInt() | ||
| val packetId = readVarInt() | ||
| val data = ByteArray(length) | ||
| readFully(data, 0, length) | ||
| return ByteReadChannel(data) | ||
| } | ||
|
|
||
| private suspend fun ByteReadChannel.readVarInt(): Int { | ||
| var value = 0 | ||
| var position = 0 | ||
| var currentByte: Byte | ||
|
|
||
| while (true) { | ||
| currentByte = readByte() | ||
| value = value or ((currentByte and 0x7F) shl position) | ||
|
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| if ((currentByte and 0x80) == 0) break | ||
|
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| position += 7 | ||
|
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| if (position >= 32) throw RuntimeException("VarInt is too big") | ||
| } | ||
|
|
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| return value | ||
| } | ||
|
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| private suspend fun ByteReadChannel.readUtf8String(): String { | ||
| val length = readVarInt() | ||
| val data = ByteArray(length) | ||
| readFully(data, 0, length) | ||
| return String(data) | ||
| } | ||
| } |