Add onLoginPluginRequest callback in client Options

docs/API.md

@@ -151,6 +151,7 @@ Returns a `Client` instance and perform login.
    * realmId : The id of the Realm to join.
    * pickRealm(realms) : A function which will have an array of the user Realms (joined/owned) passed to it. The function should return a Realm.
  * Client : You can pass a custom client class to use instead of the default one, which would allow you to create completely custom communication. Also note that you can use the `stream` option instead where you can supply custom duplex, but this will still use serialization/deserialization of packets.
+ * onLoginPluginRequest(packet, meta) : (optional) callback that is called when a `login_plugin_request` packet is received. When this option is defined and of type function then the callback is called and expected to write a `login_plugin_response` packet on client with at least `messageId: packet.messageId` in the payload. If no login_plugin_response is send the connection will halt. When the `onLoginPluginRequest` option is not defined or not of type function then a login_plugin_response packet with `messageId: packet.messageId` and no data is send.
 
 
 ## mc.Client(isServer,version,[customPackets])

src/client/pluginChannels.js

@@ -18,7 +18,13 @@ module.exports = function (client, options) {
 
   const above385 = mcdata.version.version >= 385
   if (above385) { // 1.13-pre3 (385) added Added Login Plugin Message (https://wiki.vg/Protocol_History#1.13-pre3)
-    client.on('login_plugin_request', onLoginPluginRequest)
+    client.on('login_plugin_request', (...args) => {
+      if (options.onLoginPluginRequest != null && typeof options.onLoginPluginRequest === 'function') {
+        options.onLoginPluginRequest(...args)
+      } else {
+        onLoginPluginRequest(...args)
+      }
+    })
   }
   const channelNames = above385 ? ['minecraft:register', 'minecraft:unregister'] : ['REGISTER', 'UNREGISTER']
 

src/index.d.ts

@@ -141,6 +141,7 @@ declare module 'minecraft-protocol' {
 		disableChatSigning?: boolean
 		/** Pass custom client implementation if needed. */
 		Client?: Client
+		onLoginPluginRequest?: (packet: any, meta: any, ...args: any[]) => void
 	}
 
 	export class Server extends EventEmitter {

test/clientTest.js

@@ -259,6 +259,36 @@ for (const supportedVersion of mc.supportedVersions) {
           })
         })
       })
+
+      it('sends a valid login_plugin_request packet', function (done) {
+        const onLoginPluginRequest = function (packet) {
+          client.write('login_plugin_response', {
+            messageId: packet.messageId,
+            data: Buffer.from('Hallo from nmp')
+          })
+        }
+        const client = mc.createClient({
+          username: 'Player',
+          version: version.minecraftVersion,
+          port: PORT,
+          onLoginPluginRequest: onLoginPluginRequest
+        })
+        client.on('error', err => done(err))
+        client.on('login', function () {
+          client.write('login_plugin_request', {
+            messageId: 0,
+            channel: 'minecraft:brand',
+            data: Buffer.from([0x00])
+          })
+        })
+        client.on('login_plugin_response', function (packet) {
+          assert.strictEqual(packet.messageId, 0)
+          assert.strictEqual(!!packet.data)
+          console.info('Client send in plugin response: ' + packet.data.toString())
+          client.end()
+          done()
+        })
+      })
     })
 
     describe.skip('online', function () {