Lib fails with "stream:error bad-format" when receive Whitespace Keepalive character as a part of dead connection detection

[IgorKhomenko]

Describe the bug

According to https://datatracker.ietf.org/doc/html/rfc6120#section-4.6.1 a sever can send whitespace keepalive character to detect dead connecton:

One common method for checking the TCP connection is to send a space character (U+0020) between XML stanzas, which is allowed for XML streams as described under Section 11.7; the sending of such a space character is properly called a "whitespace keepalive" (the term "whitespace ping" is often used, despite the fact that it is not a ping since no "pong" is possible).

The issue is that: when xmpp.js receives such a character - it can't parse it and fails with the below error

Logs

network_bot_prod  | [Chat] RECV:  
network_bot_prod  | [Chat] ERROR: XMLError:      must be a child.
network_bot_prod  |     at FramedParser.onText (/node_modules/@xmpp/xml/lib/Parser.js:63:26)
network_bot_prod  |     at SaxLtx.emit (events.js:400:28)
network_bot_prod  |     at SaxLtx.write (/node_modules/ltx/lib/parsers/ltx.js:102:20)
network_bot_prod  |     at FramedParser.write (/node_modules/@xmpp/xml/lib/Parser.js:71:17)
network_bot_prod  |     at Client._onData (/node_modules/@xmpp/connection/index.js:49:17)
network_bot_prod  |     at Socket.emit (events.js:400:28)
network_bot_prod  |     at WebSocket.listeners.message (/node_modules/@xmpp/websocket/lib/Socket.js:27:42)
network_bot_prod  |     at WebSocket.onMessage (/node_modules/ws/lib/event-target.js:132:16)
network_bot_prod  |     at WebSocket.emit (events.js:400:28)
network_bot_prod  |     at Receiver.receiverOnMessage (/node_modules/ws/lib/websocket.js:1008:20)
network_bot_prod  | [Chat] SENT: <stream:error><bad-format xmlns="urn:ietf:params:xml:ns:xmpp-streams"/></stream:error>
network_bot_prod  | [Chat] status - disconnecting 

network_bot_prod  | /node_modules/@xmpp/connection/index.js:49
network_bot_prod  |     this.parser.write(str)
network_bot_prod  |                 ^
network_bot_prod  | 
network_bot_prod  | TypeError: Cannot read property 'write' of null
network_bot_prod  |     at Client._onData (/node_modules/@xmpp/connection/index.js:49:17)
network_bot_prod  |     at Socket.emit (events.js:400:28)
network_bot_prod  |     at WebSocket.listeners.message (/node_modules/@xmpp/websocket/lib/Socket.js:27:42)
network_bot_prod  |     at WebSocket.onMessage (/node_modules/ws/lib/event-target.js:132:16)
network_bot_prod  |     at WebSocket.emit (events.js:400:28)
network_bot_prod  |     at Receiver.receiverOnMessage (/node_modules/ws/lib/websocket.js:1008:20)
network_bot_prod  |     at Receiver.emit (events.js:400:28)
network_bot_prod  |     at Receiver.dataMessage (/node_modules/ws/lib/receiver.js:517:14)
network_bot_prod  |     at Receiver.getData (/node_modules/ws/lib/receiver.js:435:17)
network_bot_prod  |     at Receiver.startLoop (/node_modules/ws/lib/receiver.js:143:22)
network_bot_prod  | error Command failed with exit code 1.

Environment All envs, including web and node.js

[sonnyp]

Which server are you using?

Whitespace keepalives are not allowed with Websocket https://datatracker.ietf.org/doc/html/rfc7395#section-3.8

[IgorKhomenko]

@sonnyp this is Tigase https://github.com/tigase/tigase-server/blob/master/src/main/java/tigase/server/ConnectionManager.java#L1485

[sonnyp]

https://github.com/tigase/tigase-server/issues