onPresence method
Implementation
@visibleForTesting
Future<StanzaHandlerData> onPresence(
Stanza stanza,
StanzaHandlerData state,
) async {
if (stanza.from == null) {
return state;
}
final from = JID.fromString(stanza.from!);
final c = stanza.firstTag('c', xmlns: capsXmlns)!;
final hashFunctionName = c.attributes['hash'] as String?;
final capabilityNode = c.attributes['node'] as String?;
final ver = c.attributes['ver'] as String?;
if (hashFunctionName == null || capabilityNode == null || ver == null) {
return state;
}
// Check if we know of the hash
final isCached =
await _cacheLock.synchronized(() => _capHashCache.containsKey(ver));
if (isCached) {
return state;
}
unawaited(
_performQuery(
stanza,
ver,
hashFunctionName,
capabilityNode,
from,
),
);
return state;
}