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https://github.com/WorldEditAxe/eaglerproxy.git
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Implement Eaglercraft skins
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q13x
parent
2e75776ff1
commit
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181
eaglerSkin.ts
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181
eaglerSkin.ts
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import {
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encodeULEB128 as encodeVarInt,
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decodeULEB128 as decodeVarInt,
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encodeSLEB128 as encodeSVarInt,
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decodeSLEB128 as decodeSVarInt
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} from "@thi.ng/leb128"
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import { DecodedCFetchSkin, DecodedSSkinDl, DecodedCSkinReq, DecodedSSkinFetchBuiltin, UnpackedChannelMessage, ProxiedPlayer, ChannelMessageType } from "./types.js"
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import uuidBuffer from "uuid-buffer"
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import { bufferizeUUID } from "./utils.js"
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import { EAGLERCRAFT_SKIN_CHANNEL_NAME, EaglerSkinPacketId, MAGIC_ENDING_S_SKINDL_BI } from "./eaglerPacketDef.js"
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import sharp from "sharp"
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import request from "request"
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export function unpackChannelMessage(message: Buffer): UnpackedChannelMessage {
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if (message[0] != 0x17 && message[0] != 0x3f)
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throw new Error("Invalid packet ID detected")
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const ret: UnpackedChannelMessage = {
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channel: null,
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data: null,
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type: null
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}
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const Iid = decodeVarInt(message)
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const channelNameLen = decodeVarInt(message.subarray(Iid[1])), channelName = message.subarray(Iid[1] + channelNameLen[1], Iid[1] + channelNameLen[1] + Number(channelNameLen[0])).toString()
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ret.type = Number(Iid[0])
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ret.channel = channelName
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ret.data = message.subarray(Iid[1] + channelNameLen[1] + channelName.length)
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return ret
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}
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export function packChannelMessage(channel: string, type: ChannelMessageType, message: Buffer): Buffer {
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const channelNameLen = encodeVarInt(channel.length), buff = Buffer.alloc(1 + channelNameLen.length + channel.length + message.length)
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buff.set([type,...channelNameLen, ...Buffer.from(channel), ...message])
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return buff
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}
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export function decodeCFetchSkin(message: Buffer): DecodedCFetchSkin {
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const ret: DecodedCFetchSkin = {
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id: null,
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uuid: null
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}
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const Iid = decodeVarInt(message), uuid = uuidBuffer.toString(message.subarray(Iid[1]))
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ret.id = Number(Iid[0])
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ret.uuid = uuid
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return ret
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}
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export function encodeFetchSkin(uuid: string | Buffer): Buffer {
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uuid = typeof uuid == 'string' ? bufferizeUUID(uuid) : uuid
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const buff = Buffer.alloc(1 + uuid.length)
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buff.set([EaglerSkinPacketId.C_FETCH_SKIN, ...uuid])
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return buff
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}
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export function decodeSSkinDlBuiltin(message: Buffer): DecodedSSkinFetchBuiltin {
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const ret: DecodedSSkinFetchBuiltin = {
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id: null,
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uuid: null,
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skinId: null
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}
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const Iid = decodeVarInt(message), uuid = uuidBuffer.toString(message.subarray(Iid[1], Iid[1] + 16))
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ret.id = Number(Iid[0])
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ret.uuid = uuid
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const skinId = decodeVarInt(message.subarray(Iid[1] + 16 + 3))
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ret.skinId = Number(skinId)
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return ret
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}
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export function encodeSSkinDlBuiltin(uuid: string | Buffer, skinId: number): Buffer {
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uuid = typeof uuid == 'string' ? bufferizeUUID(uuid) : uuid
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const encSkinId = encodeVarInt(skinId)
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const buff = Buffer.alloc(1 + 16 + 3 + encSkinId.length)
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buff.set([EaglerSkinPacketId.S_SKIN_DL_BI, ...uuid, ...Buffer.from(MAGIC_ENDING_S_SKINDL_BI), encSkinId[0]])
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return buff
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}
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export function decodeSSkinDl(message: Buffer): DecodedSSkinDl {
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const ret: DecodedSSkinDl = {
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id: null,
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uuid: null,
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skin: null
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}
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const Iid = decodeVarInt(message), uuid = uuidBuffer.toString(message.subarray(Iid[1], Iid[1] + 16))
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ret.id = Number(Iid[0])
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ret.uuid = uuid
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const skin = message.subarray(Iid[1] + 16)
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ret.skin = skin
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return ret
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}
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export function encodeSSkinDl(uuid: string | Buffer, skin: Buffer, isFetched: boolean): Buffer {
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uuid = typeof uuid == 'string' ? bufferizeUUID(uuid) : uuid
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// eaglercraft clients always expect a 16385 byte long byte array for the skin
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if (!isFetched) skin = skin.length !== 16384 ? skin.length < 16384 ? Buffer.concat([Buffer.alloc(16384 - skin.length), skin]) : skin.subarray(16383) : skin
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else skin = skin.length !== 16384 ? skin.length < 16384 ? Buffer.concat([skin, Buffer.alloc(16384 - skin.length)]) : skin.subarray(16383) : skin
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const skinLen = encodeVarInt(skin.length), buff = Buffer.alloc(1 + 16 + 1 + skin.length)
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buff.set([EaglerSkinPacketId.S_SKIN_DL, ...uuid, 0xff,...skin])
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return buff
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}
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export function decodeCSkinReq(message: Buffer): DecodedCSkinReq {
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const ret: DecodedCSkinReq = {
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id: null,
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uuid: null,
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url: null
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}
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const Iid = decodeVarInt(message), uuid = uuidBuffer.toString(message.subarray(Iid[1], Iid[1] + 16))
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ret.id = Number(Iid[0])
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ret.uuid = uuid
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const urlLen = decodeVarInt(message.subarray(Iid[1] + 16 + 1)), url = message.subarray(Iid[1] + 16 + 1 + urlLen[1]).toString()
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ret.url = url
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return ret
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}
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export function encodeCSkinReq(uuid: string | Buffer, url: string): Buffer {
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uuid = typeof uuid == 'string' ? bufferizeUUID(uuid) : uuid
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const urlLen = encodeVarInt(url.length), eUrl = Buffer.from(url)
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const buff = Buffer.alloc(1 + 1 + 16 + urlLen.length + eUrl.length)
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buff.set([EaglerSkinPacketId.C_REQ_SKIN, ...uuid, 0x00, ...urlLen, ...eUrl])
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return buff
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}
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// TODO: fix broken custom skins
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export async function fetchSkin(url: string): Promise<Buffer> {
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return new Promise<Buffer>((res, rej) => {
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let body = []
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request({ url: url, encoding: null }, (err, response, body) => {
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if (err) {
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rej(err)
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} else {
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sharp(body)
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.resize(64, 64)
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.raw({ depth: 'char' })
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.toBuffer()
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.then(res)
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.catch(rej)
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}
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})
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})
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}
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export function getPlayerWithUUID(uuid: string): ProxiedPlayer {
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for (const [username, plr] of PROXY.players) {
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if (plr.uuid == uuid)
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return plr
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}
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return null
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}
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export async function processClientReqPacket(decodedMessage: UnpackedChannelMessage, client: ProxiedPlayer) {
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if (decodedMessage.type == ChannelMessageType.SERVER)
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throw new Error("Server message was passed to client message handler")
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switch(decodedMessage.data[0] as EaglerSkinPacketId) {
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default:
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throw new Error("Unknown operation")
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break
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case EaglerSkinPacketId.C_REQ_SKIN:
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const reqSkinPck = decodeCSkinReq(decodedMessage.data)
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if (getPlayerWithUUID(reqSkinPck.uuid)) {
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client.ws.send(packChannelMessage(EAGLERCRAFT_SKIN_CHANNEL_NAME, ChannelMessageType.SERVER, encodeSSkinDl(reqSkinPck.uuid, getPlayerWithUUID(reqSkinPck.uuid).skin.customSkin, false)))
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} else {
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try {
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const skin = await fetchSkin(reqSkinPck.url)
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const resPck = encodeSSkinDl(reqSkinPck.uuid, skin, true)
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client.ws.send(packChannelMessage(EAGLERCRAFT_SKIN_CHANNEL_NAME, ChannelMessageType.SERVER, resPck))
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} catch {}
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}
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break
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case EaglerSkinPacketId.C_FETCH_SKIN:
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const fetchSkinPlrPck = decodeCFetchSkin(decodedMessage.data)
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const plr = getPlayerWithUUID(fetchSkinPlrPck.uuid)
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if (plr) {
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if (plr.skin.type == 'BUILTIN') {
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client.ws.send(packChannelMessage(EAGLERCRAFT_SKIN_CHANNEL_NAME, ChannelMessageType.SERVER, encodeSSkinDlBuiltin(plr.uuid, plr.skin.skinId)))
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} else {
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client.ws.send(packChannelMessage(EAGLERCRAFT_SKIN_CHANNEL_NAME, ChannelMessageType.SERVER, encodeSSkinDl(plr.uuid, plr.skin.customSkin, false)))
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}
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}
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}
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}
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